/*
 * Copyright 2006 The Android Open Source Project
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "include/core/SkTypes.h"
#if defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_IOS)

#ifdef SK_BUILD_FOR_MAC
#import <ApplicationServices/ApplicationServices.h>
#endif

#ifdef SK_BUILD_FOR_IOS
#include <CoreText/CoreText.h>
#include <CoreText/CTFontManager.h>
#include <CoreGraphics/CoreGraphics.h>
#include <CoreFoundation/CoreFoundation.h>
#endif

#include "include/core/SkFontMetrics.h"
#include "include/core/SkFontMgr.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPath.h"
#include "include/core/SkStream.h"
#include "include/core/SkString.h"
#include "include/ports/SkTypeface_mac.h"
#include "include/private/SkColorData.h"
#include "include/private/SkFloatingPoint.h"
#include "include/private/SkMutex.h"
#include "include/private/SkOnce.h"
#include "include/private/SkTemplates.h"
#include "include/private/SkTo.h"
#include "include/utils/mac/SkCGUtils.h"
#include "src/core/SkAdvancedTypefaceMetrics.h"
#include "src/core/SkAutoMalloc.h"
#include "src/core/SkDescriptor.h"
#include "src/core/SkEndian.h"
#include "src/core/SkFontDescriptor.h"
#include "src/core/SkGlyph.h"
#include "src/core/SkMakeUnique.h"
#include "src/core/SkMaskGamma.h"
#include "src/core/SkMathPriv.h"
#include "src/core/SkTypefaceCache.h"
#include "src/core/SkUtils.h"
#include "src/sfnt/SkOTTable_OS_2.h"
#include "src/sfnt/SkOTUtils.h"
#include "src/sfnt/SkSFNTHeader.h"
#include "src/utils/SkUTF.h"
#include "src/utils/mac/SkUniqueCFRef.h"

#include <dlfcn.h>

#include <utility>

// Set to make glyph bounding boxes visible.
#define SK_SHOW_TEXT_BLIT_COVERAGE 0

CTFontRef SkTypeface_GetCTFontRef(const SkTypeface* face) {
    return face ? (CTFontRef)face->internal_private_getCTFontRef() : nullptr;
}

class SkScalerContext_Mac;

static SkUniqueCFRef<CFStringRef> make_CFString(const char s[]) {
    return SkUniqueCFRef<CFStringRef>(CFStringCreateWithCString(nullptr, s, kCFStringEncodingUTF8));
}

// inline versions of these rect helpers

static bool CGRectIsEmpty_inline(const CGRect& rect) {
    return rect.size.width <= 0 || rect.size.height <= 0;
}

static CGFloat CGRectGetMinX_inline(const CGRect& rect) {
    return rect.origin.x;
}

static CGFloat CGRectGetMaxX_inline(const CGRect& rect) {
    return rect.origin.x + rect.size.width;
}

static CGFloat CGRectGetMinY_inline(const CGRect& rect) {
    return rect.origin.y;
}

static CGFloat CGRectGetMaxY_inline(const CGRect& rect) {
    return rect.origin.y + rect.size.height;
}

static CGFloat CGRectGetWidth_inline(const CGRect& rect) {
    return rect.size.width;
}

///////////////////////////////////////////////////////////////////////////////

static void sk_memset_rect32(uint32_t* ptr, uint32_t value,
                             int width, int height, size_t rowBytes) {
    SkASSERT(width);
    SkASSERT(width * sizeof(uint32_t) <= rowBytes);

    if (width >= 32) {
        while (height) {
            sk_memset32(ptr, value, width);
            ptr = (uint32_t*)((char*)ptr + rowBytes);
            height -= 1;
        }
        return;
    }

    rowBytes -= width * sizeof(uint32_t);

    if (width >= 8) {
        while (height) {
            int w = width;
            do {
                *ptr++ = value; *ptr++ = value;
                *ptr++ = value; *ptr++ = value;
                *ptr++ = value; *ptr++ = value;
                *ptr++ = value; *ptr++ = value;
                w -= 8;
            } while (w >= 8);
            while (--w >= 0) {
                *ptr++ = value;
            }
            ptr = (uint32_t*)((char*)ptr + rowBytes);
            height -= 1;
        }
    } else {
        while (height) {
            int w = width;
            do {
                *ptr++ = value;
            } while (--w > 0);
            ptr = (uint32_t*)((char*)ptr + rowBytes);
            height -= 1;
        }
    }
}

typedef uint32_t CGRGBPixel;

static unsigned CGRGBPixel_getAlpha(CGRGBPixel pixel) {
    return pixel & 0xFF;
}

static CGFloat ScalarToCG(SkScalar scalar) {
    if (sizeof(CGFloat) == sizeof(float)) {
        return SkScalarToFloat(scalar);
    } else {
        SkASSERT(sizeof(CGFloat) == sizeof(double));
        return (CGFloat) SkScalarToDouble(scalar);
    }
}

static SkScalar CGToScalar(CGFloat cgFloat) {
    if (sizeof(CGFloat) == sizeof(float)) {
        return SkFloatToScalar(cgFloat);
    } else {
        SkASSERT(sizeof(CGFloat) == sizeof(double));
        return SkDoubleToScalar(cgFloat);
    }
}

static float CGToFloat(CGFloat cgFloat) {
    if (sizeof(CGFloat) == sizeof(float)) {
        return cgFloat;
    } else {
        SkASSERT(sizeof(CGFloat) == sizeof(double));
        return static_cast<float>(cgFloat);
    }
}

static CGAffineTransform MatrixToCGAffineTransform(const SkMatrix& matrix) {
    return CGAffineTransformMake( ScalarToCG(matrix[SkMatrix::kMScaleX]),
                                 -ScalarToCG(matrix[SkMatrix::kMSkewY] ),
                                 -ScalarToCG(matrix[SkMatrix::kMSkewX] ),
                                  ScalarToCG(matrix[SkMatrix::kMScaleY]),
                                  ScalarToCG(matrix[SkMatrix::kMTransX]),
                                  ScalarToCG(matrix[SkMatrix::kMTransY]));
}

///////////////////////////////////////////////////////////////////////////////

#define BITMAP_INFO_RGB (kCGImageAlphaNoneSkipFirst | kCGBitmapByteOrder32Host)

/** Drawn in FontForge, reduced with fonttools ttx, converted by xxd -i,
 *  this TrueType font contains a glyph of the spider.
 *
 *  To re-forge the original bytes of the TrueType font file,
 *  remove all ',|( +0x)' from this definition,
 *  copy the data to the clipboard,
 *  run 'pbpaste | xxd -p -r - spider.ttf'.
 */
static constexpr const uint8_t kSpiderSymbol_ttf[] = {
    0x00, 0x01, 0x00, 0x00, 0x00, 0x0c, 0x00, 0x80, 0x00, 0x03, 0x00, 0x40,
    0x47, 0x44, 0x45, 0x46, 0x00, 0x14, 0x00, 0x14, 0x00, 0x00, 0x07, 0xa8,
    0x00, 0x00, 0x00, 0x18, 0x4f, 0x53, 0x2f, 0x32, 0x8a, 0xf4, 0xfb, 0xdb,
    0x00, 0x00, 0x01, 0x48, 0x00, 0x00, 0x00, 0x60, 0x63, 0x6d, 0x61, 0x70,
    0xe0, 0x7f, 0x10, 0x7e, 0x00, 0x00, 0x01, 0xb8, 0x00, 0x00, 0x00, 0x54,
    0x67, 0x61, 0x73, 0x70, 0xff, 0xff, 0x00, 0x03, 0x00, 0x00, 0x07, 0xa0,
    0x00, 0x00, 0x00, 0x08, 0x67, 0x6c, 0x79, 0x66, 0x97, 0x0b, 0x6a, 0xf6,
    0x00, 0x00, 0x02, 0x18, 0x00, 0x00, 0x03, 0x40, 0x68, 0x65, 0x61, 0x64,
    0x0f, 0xa2, 0x24, 0x1a, 0x00, 0x00, 0x00, 0xcc, 0x00, 0x00, 0x00, 0x36,
    0x68, 0x68, 0x65, 0x61, 0x0e, 0xd3, 0x07, 0x3f, 0x00, 0x00, 0x01, 0x04,
    0x00, 0x00, 0x00, 0x24, 0x68, 0x6d, 0x74, 0x78, 0x10, 0x03, 0x00, 0x44,
    0x00, 0x00, 0x01, 0xa8, 0x00, 0x00, 0x00, 0x0e, 0x6c, 0x6f, 0x63, 0x61,
    0x01, 0xb4, 0x00, 0x28, 0x00, 0x00, 0x02, 0x0c, 0x00, 0x00, 0x00, 0x0a,
    0x6d, 0x61, 0x78, 0x70, 0x00, 0x4a, 0x01, 0x4d, 0x00, 0x00, 0x01, 0x28,
    0x00, 0x00, 0x00, 0x20, 0x6e, 0x61, 0x6d, 0x65, 0xc3, 0xe5, 0x39, 0xd4,
    0x00, 0x00, 0x05, 0x58, 0x00, 0x00, 0x02, 0x28, 0x70, 0x6f, 0x73, 0x74,
    0xff, 0x03, 0x00, 0x67, 0x00, 0x00, 0x07, 0x80, 0x00, 0x00, 0x00, 0x20,
    0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x0b, 0x0f, 0x08, 0x1d,
    0x5f, 0x0f, 0x3c, 0xf5, 0x00, 0x0b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00,
    0xd1, 0x97, 0xa8, 0x5a, 0x00, 0x00, 0x00, 0x00, 0xd6, 0xe8, 0x32, 0x33,
    0x00, 0x03, 0xff, 0x3b, 0x08, 0x00, 0x05, 0x55, 0x00, 0x00, 0x00, 0x08,
    0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00,
    0x05, 0x55, 0xff, 0x3b, 0x01, 0x79, 0x08, 0x00, 0x00, 0x03, 0x00, 0x00,
    0x08, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x00, 0x01, 0x00, 0x00,
    0x00, 0x04, 0x01, 0x1c, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02,
    0x00, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x00, 0x40, 0x00, 0x2e,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x08, 0x00, 0x01, 0x90, 0x00, 0x05,
    0x00, 0x00, 0x05, 0x33, 0x05, 0x99, 0x00, 0x00, 0x01, 0x1e, 0x05, 0x33,
    0x05, 0x99, 0x00, 0x00, 0x03, 0xd7, 0x00, 0x66, 0x02, 0x12, 0x00, 0x00,
    0x05, 0x00, 0x01, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x73, 0x6b, 0x69, 0x61, 0x00, 0xc0, 0x00, 0x00, 0xf0, 0x21,
    0x06, 0x66, 0xfe, 0x66, 0x01, 0x79, 0x05, 0x55, 0x00, 0xc5, 0x80, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x20, 0x00, 0x01, 0x08, 0x00, 0x00, 0x44, 0x00, 0x00, 0x00, 0x00,
    0x08, 0x00, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
    0x00, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x00, 0x04, 0x00, 0x48,
    0x00, 0x00, 0x00, 0x0e, 0x00, 0x08, 0x00, 0x02, 0x00, 0x06, 0x00, 0x00,
    0x00, 0x09, 0x00, 0x0d, 0x00, 0x1d, 0x00, 0x21, 0xf0, 0x21, 0xff, 0xff,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x0d, 0x00, 0x1d, 0x00, 0x21,
    0xf0, 0x21, 0xff, 0xff, 0x00, 0x01, 0xff, 0xf9, 0xff, 0xf5, 0xff, 0xe4,
    0xff, 0xe2, 0x0f, 0xe2, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x14,
    0x00, 0x14, 0x00, 0x14, 0x01, 0xa0, 0x00, 0x00, 0x00, 0x02, 0x00, 0x44,
    0x00, 0x00, 0x02, 0x64, 0x05, 0x55, 0x00, 0x03, 0x00, 0x07, 0x00, 0x00,
    0x33, 0x11, 0x21, 0x11, 0x25, 0x21, 0x11, 0x21, 0x44, 0x02, 0x20, 0xfe,
    0x24, 0x01, 0x98, 0xfe, 0x68, 0x05, 0x55, 0xfa, 0xab, 0x44, 0x04, 0xcd,
    0x00, 0x04, 0x00, 0x03, 0xff, 0x3b, 0x08, 0x00, 0x05, 0x4c, 0x00, 0x15,
    0x00, 0x1d, 0x00, 0x25, 0x01, 0x1b, 0x00, 0x00, 0x01, 0x36, 0x37, 0x36,
    0x27, 0x26, 0x07, 0x06, 0x06, 0x23, 0x22, 0x27, 0x26, 0x27, 0x26, 0x07,
    0x06, 0x17, 0x16, 0x17, 0x16, 0x32, 0x37, 0x32, 0x35, 0x34, 0x23, 0x22,
    0x15, 0x14, 0x27, 0x32, 0x35, 0x34, 0x23, 0x22, 0x15, 0x14, 0x03, 0x32,
    0x17, 0x30, 0x17, 0x31, 0x36, 0x37, 0x36, 0x37, 0x36, 0x37, 0x36, 0x33,
    0x32, 0x33, 0x16, 0x33, 0x32, 0x17, 0x16, 0x07, 0x06, 0x23, 0x22, 0x27,
    0x26, 0x27, 0x26, 0x23, 0x22, 0x07, 0x07, 0x06, 0x07, 0x06, 0x07, 0x06,
    0x1f, 0x02, 0x37, 0x36, 0x37, 0x36, 0x33, 0x32, 0x17, 0x17, 0x16, 0x33,
    0x16, 0x17, 0x16, 0x07, 0x06, 0x23, 0x22, 0x27, 0x27, 0x26, 0x23, 0x22,
    0x07, 0x06, 0x07, 0x06, 0x17, 0x16, 0x17, 0x16, 0x33, 0x32, 0x33, 0x32,
    0x37, 0x36, 0x37, 0x36, 0x17, 0x16, 0x1f, 0x02, 0x16, 0x17, 0x16, 0x15,
    0x14, 0x23, 0x22, 0x27, 0x27, 0x26, 0x27, 0x27, 0x26, 0x27, 0x26, 0x07,
    0x06, 0x07, 0x06, 0x17, 0x16, 0x17, 0x16, 0x15, 0x14, 0x07, 0x06, 0x07,
    0x06, 0x23, 0x22, 0x27, 0x26, 0x07, 0x06, 0x07, 0x06, 0x15, 0x14, 0x17,
    0x16, 0x17, 0x16, 0x15, 0x14, 0x07, 0x06, 0x23, 0x22, 0x27, 0x26, 0x27,
    0x26, 0x35, 0x34, 0x37, 0x36, 0x37, 0x36, 0x37, 0x34, 0x27, 0x26, 0x07,
    0x06, 0x07, 0x06, 0x0f, 0x02, 0x06, 0x23, 0x22, 0x27, 0x26, 0x35, 0x34,
    0x37, 0x37, 0x36, 0x37, 0x36, 0x37, 0x36, 0x37, 0x36, 0x27, 0x26, 0x27,
    0x26, 0x07, 0x06, 0x07, 0x06, 0x07, 0x06, 0x07, 0x07, 0x06, 0x23, 0x22,
    0x27, 0x26, 0x35, 0x34, 0x37, 0x36, 0x37, 0x37, 0x36, 0x37, 0x37, 0x36,
    0x37, 0x36, 0x37, 0x36, 0x35, 0x34, 0x27, 0x26, 0x27, 0x26, 0x27, 0x26,
    0x23, 0x22, 0x07, 0x06, 0x07, 0x06, 0x07, 0x06, 0x27, 0x26, 0x27, 0x26,
    0x27, 0x26, 0x35, 0x34, 0x37, 0x36, 0x37, 0x36, 0x37, 0x36, 0x33, 0x32,
    0x17, 0x16, 0x33, 0x32, 0x37, 0x36, 0x35, 0x34, 0x37, 0x36, 0x37, 0x36,
    0x33, 0x04, 0xf5, 0x23, 0x13, 0x11, 0x14, 0x16, 0x1d, 0x1b, 0x4c, 0x1f,
    0x0e, 0x2d, 0x23, 0x14, 0x2c, 0x13, 0x18, 0x25, 0x2c, 0x10, 0x3c, 0x71,
    0x1d, 0x5c, 0x5c, 0x3f, 0xae, 0x5c, 0x5c, 0x3f, 0x6a, 0x27, 0x31, 0x5b,
    0x09, 0x27, 0x36, 0x03, 0x0a, 0x26, 0x35, 0x2e, 0x09, 0x08, 0xc6, 0x13,
    0x81, 0x17, 0x20, 0x18, 0x21, 0x1e, 0x04, 0x04, 0x15, 0x5c, 0x22, 0x26,
    0x48, 0x56, 0x3b, 0x10, 0x21, 0x01, 0x0c, 0x06, 0x06, 0x0f, 0x31, 0x44,
    0x3c, 0x52, 0x4a, 0x1d, 0x11, 0x3f, 0xb4, 0x71, 0x01, 0x26, 0x06, 0x0d,
    0x15, 0x1a, 0x2a, 0x13, 0x53, 0xaa, 0x42, 0x1d, 0x0a, 0x33, 0x20, 0x21,
    0x2b, 0x01, 0x02, 0x3e, 0x21, 0x09, 0x02, 0x02, 0x0f, 0x2d, 0x4b, 0x0a,
    0x22, 0x15, 0x20, 0x1f, 0x72, 0x8b, 0x2d, 0x2f, 0x1d, 0x1f, 0x0e, 0x25,
    0x3f, 0x4d, 0x1b, 0x63, 0x2a, 0x2c, 0x14, 0x22, 0x18, 0x1c, 0x0f, 0x08,
    0x2a, 0x08, 0x08, 0x0d, 0x3b, 0x4c, 0x52, 0x74, 0x27, 0x71, 0x2e, 0x01,
    0x0c, 0x10, 0x15, 0x0d, 0x06, 0x0d, 0x05, 0x01, 0x06, 0x2c, 0x28, 0x14,
    0x1b, 0x05, 0x04, 0x10, 0x06, 0x12, 0x08, 0x0a, 0x16, 0x27, 0x03, 0x0d,
    0x30, 0x4c, 0x4c, 0x4b, 0x1f, 0x0b, 0x22, 0x26, 0x0d, 0x15, 0x0d, 0x2d,
    0x68, 0x34, 0x14, 0x3c, 0x25, 0x12, 0x04, 0x10, 0x18, 0x0b, 0x09, 0x30,
    0x2b, 0x44, 0x66, 0x14, 0x47, 0x47, 0x59, 0x73, 0x25, 0x05, 0x03, 0x1f,
    0x01, 0x08, 0x3f, 0x48, 0x4b, 0x4b, 0x76, 0x2f, 0x49, 0x2d, 0x22, 0x24,
    0x0c, 0x15, 0x08, 0x0e, 0x33, 0x03, 0x44, 0x4c, 0x10, 0x46, 0x13, 0x1f,
    0x27, 0x1b, 0x1d, 0x13, 0x02, 0x24, 0x08, 0x02, 0x42, 0x0e, 0x4d, 0x3c,
    0x19, 0x1b, 0x40, 0x2b, 0x2b, 0x1e, 0x16, 0x11, 0x04, 0x1f, 0x11, 0x04,
    0x18, 0x11, 0x35, 0x01, 0xa3, 0x13, 0x24, 0x1f, 0x0b, 0x0c, 0x19, 0x19,
    0x18, 0x13, 0x0f, 0x0c, 0x1a, 0x18, 0x1f, 0x19, 0x1e, 0x07, 0x1a, 0xc3,
    0x54, 0x51, 0x54, 0x51, 0x04, 0x53, 0x51, 0x54, 0x50, 0x02, 0x48, 0x1a,
    0x31, 0x18, 0x55, 0x74, 0x04, 0x0e, 0x09, 0x0d, 0x06, 0x10, 0x16, 0x1b,
    0x24, 0x01, 0x04, 0x0b, 0x04, 0x10, 0x3f, 0x0a, 0x41, 0x02, 0x41, 0x20,
    0x06, 0x12, 0x16, 0x21, 0x17, 0x2a, 0x1e, 0x15, 0x40, 0x27, 0x11, 0x0e,
    0x1e, 0x11, 0x15, 0x1f, 0x43, 0x13, 0x1a, 0x10, 0x15, 0x1b, 0x04, 0x09,
    0x4d, 0x2a, 0x0f, 0x19, 0x0a, 0x0a, 0x03, 0x05, 0x15, 0x3c, 0x64, 0x21,
    0x4b, 0x2e, 0x21, 0x28, 0x13, 0x47, 0x44, 0x19, 0x3f, 0x11, 0x18, 0x0b,
    0x0a, 0x07, 0x18, 0x0d, 0x07, 0x24, 0x2c, 0x2b, 0x21, 0x32, 0x10, 0x48,
    0x2a, 0x2d, 0x1e, 0x1a, 0x01, 0x0c, 0x43, 0x59, 0x28, 0x4e, 0x1c, 0x0d,
    0x5d, 0x24, 0x14, 0x0a, 0x05, 0x1f, 0x24, 0x32, 0x46, 0x3e, 0x5f, 0x3e,
    0x44, 0x1a, 0x30, 0x15, 0x0d, 0x07, 0x18, 0x2b, 0x03, 0x0d, 0x1a, 0x28,
    0x28, 0x57, 0xb2, 0x29, 0x27, 0x40, 0x2c, 0x23, 0x16, 0x63, 0x58, 0x1a,
    0x0a, 0x18, 0x11, 0x23, 0x08, 0x1b, 0x29, 0x05, 0x04, 0x0b, 0x15, 0x0d,
    0x14, 0x0b, 0x2a, 0x29, 0x5a, 0x62, 0x01, 0x19, 0x1e, 0x05, 0x05, 0x26,
    0x42, 0x42, 0x2a, 0x2a, 0x3f, 0x0d, 0x0f, 0x09, 0x05, 0x07, 0x01, 0x0b,
    0x25, 0x3e, 0x0d, 0x17, 0x11, 0x01, 0x03, 0x0d, 0x13, 0x20, 0x19, 0x11,
    0x03, 0x02, 0x01, 0x04, 0x11, 0x04, 0x05, 0x1b, 0x3d, 0x10, 0x29, 0x20,
    0x04, 0x04, 0x0a, 0x07, 0x04, 0x1f, 0x15, 0x20, 0x3e, 0x0f, 0x2a, 0x1e,
    0x00, 0x00, 0x00, 0x1b, 0x01, 0x4a, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
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    0x00, 0x0e, 0x00, 0x1a, 0x00, 0x30, 0x00, 0x03, 0x00, 0x00, 0x04, 0x09,
    0x00, 0x00, 0x00, 0x36, 0x00, 0x4a, 0x00, 0x03, 0x00, 0x00, 0x04, 0x09,
    0x00, 0x01, 0x00, 0x18, 0x00, 0x80, 0x00, 0x03, 0x00, 0x00, 0x04, 0x09,
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    0x00, 0x03, 0x00, 0x18, 0x00, 0x80, 0x00, 0x03, 0x00, 0x00, 0x04, 0x09,
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    0x00, 0x0d, 0x00, 0x36, 0x00, 0x4a, 0x00, 0x03, 0x00, 0x01, 0x04, 0x09,
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    0x2c, 0x20, 0x47, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x53, 0x70, 0x69,
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    0x2e, 0x6f, 0x72, 0x67, 0x2f, 0x4f, 0x46, 0x4c, 0x00, 0x43, 0x00, 0x6f,
    0x00, 0x70, 0x00, 0x79, 0x00, 0x72, 0x00, 0x69, 0x00, 0x67, 0x00, 0x68,
    0x00, 0x74, 0x00, 0x20, 0x00, 0x28, 0x00, 0x63, 0x00, 0x29, 0x00, 0x20,
    0x00, 0x32, 0x00, 0x30, 0x00, 0x31, 0x00, 0x35, 0x00, 0x2c, 0x00, 0x20,
    0x00, 0x47, 0x00, 0x6f, 0x00, 0x6f, 0x00, 0x67, 0x00, 0x6c, 0x00, 0x65,
    0x00, 0x2e, 0x00, 0x53, 0x00, 0x70, 0x00, 0x69, 0x00, 0x64, 0x00, 0x65,
    0x00, 0x72, 0x00, 0x53, 0x00, 0x79, 0x00, 0x6d, 0x00, 0x62, 0x00, 0x6f,
    0x00, 0x6c, 0x00, 0x52, 0x00, 0x65, 0x00, 0x67, 0x00, 0x75, 0x00, 0x6c,
    0x00, 0x61, 0x00, 0x72, 0x00, 0x56, 0x00, 0x31, 0x00, 0x68, 0x00, 0x74,
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    0x00, 0x63, 0x00, 0x72, 0x00, 0x69, 0x00, 0x70, 0x00, 0x74, 0x00, 0x73,
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    0x00, 0x72, 0x00, 0x67, 0x00, 0x2f, 0x00, 0x4f, 0x00, 0x46, 0x00, 0x4c,
    0x00, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x00, 0x00, 0x66,
    0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
    0xff, 0xff, 0x00, 0x02, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x0c, 0x00, 0x14, 0x00, 0x04, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00,
    0x00, 0x02, 0x00, 0x00
};

enum class SmoothBehavior {
    none, // SmoothFonts produces no effect.
    some, // SmoothFonts produces some effect, but not subpixel coverage.
    subpixel, // SmoothFonts produces some effect and provides subpixel coverage.
};

/**
 * There does not appear to be a publicly accessable API for determining if lcd
 * font smoothing will be applied if we request it. The main issue is that if
 * smoothing is applied a gamma of 2.0 will be used, if not a gamma of 1.0.
 */
static SmoothBehavior smooth_behavior() {
    static SmoothBehavior gSmoothBehavior = []{
        uint32_t noSmoothBitmap[16][16] = {};
        uint32_t smoothBitmap[16][16] = {};

        SkUniqueCFRef<CGColorSpaceRef> colorspace(CGColorSpaceCreateDeviceRGB());
        SkUniqueCFRef<CGContextRef> noSmoothContext(
                CGBitmapContextCreate(&noSmoothBitmap, 16, 16, 8, 16*4,
                                      colorspace.get(), BITMAP_INFO_RGB));
        SkUniqueCFRef<CGContextRef> smoothContext(
                CGBitmapContextCreate(&smoothBitmap, 16, 16, 8, 16*4,
                                      colorspace.get(), BITMAP_INFO_RGB));

        SkUniqueCFRef<CFDataRef> data(CFDataCreateWithBytesNoCopy(
                kCFAllocatorDefault, kSpiderSymbol_ttf, SK_ARRAY_COUNT(kSpiderSymbol_ttf),
                kCFAllocatorNull));
        SkUniqueCFRef<CTFontDescriptorRef> desc(
                CTFontManagerCreateFontDescriptorFromData(data.get()));
        SkUniqueCFRef<CTFontRef> ctFont(CTFontCreateWithFontDescriptor(desc.get(), 16, nullptr));
        SkASSERT(ctFont);

        CGContextSetShouldSmoothFonts(noSmoothContext.get(), false);
        CGContextSetShouldAntialias(noSmoothContext.get(), true);
        CGContextSetTextDrawingMode(noSmoothContext.get(), kCGTextFill);
        CGContextSetGrayFillColor(noSmoothContext.get(), 1, 1);

        CGContextSetShouldSmoothFonts(smoothContext.get(), true);
        CGContextSetShouldAntialias(smoothContext.get(), true);
        CGContextSetTextDrawingMode(smoothContext.get(), kCGTextFill);
        CGContextSetGrayFillColor(smoothContext.get(), 1, 1);

        CGPoint point = CGPointMake(0, 3);
        CGGlyph spiderGlyph = 3;
        CTFontDrawGlyphs(ctFont.get(), &spiderGlyph, &point, 1, noSmoothContext.get());
        CTFontDrawGlyphs(ctFont.get(), &spiderGlyph, &point, 1, smoothContext.get());

        // For debugging.
        //SkUniqueCFRef<CGImageRef> image(CGBitmapContextCreateImage(noSmoothContext()));
        //SkUniqueCFRef<CGImageRef> image(CGBitmapContextCreateImage(smoothContext()));

        SmoothBehavior smoothBehavior = SmoothBehavior::none;
        for (int x = 0; x < 16; ++x) {
            for (int y = 0; y < 16; ++y) {
                uint32_t smoothPixel = smoothBitmap[x][y];
                uint32_t r = (smoothPixel >> 16) & 0xFF;
                uint32_t g = (smoothPixel >>  8) & 0xFF;
                uint32_t b = (smoothPixel >>  0) & 0xFF;
                if (r != g || r != b) {
                    return SmoothBehavior::subpixel;
                }
                if (noSmoothBitmap[x][y] != smoothPixel) {
                    smoothBehavior = SmoothBehavior::some;
                }
            }
        }
        return smoothBehavior;
    }();
    return gSmoothBehavior;
}

class Offscreen {
public:
    Offscreen()
        : fRGBSpace(nullptr)
        , fCG(nullptr)
        , fDoAA(false)
        , fDoLCD(false)
    {
        fSize.set(0, 0);
    }

    CGRGBPixel* getCG(const SkScalerContext_Mac& context, const SkGlyph& glyph,
                      CGGlyph glyphID, size_t* rowBytesPtr, bool generateA8FromLCD);

private:
    enum {
        kSize = 32 * 32 * sizeof(CGRGBPixel)
    };
    SkAutoSMalloc<kSize> fImageStorage;
    SkUniqueCFRef<CGColorSpaceRef> fRGBSpace;

    // cached state
    SkUniqueCFRef<CGContextRef> fCG;
    SkISize fSize;
    bool fDoAA;
    bool fDoLCD;

    static int RoundSize(int dimension) {
        return SkNextPow2(dimension);
    }
};

///////////////////////////////////////////////////////////////////////////////

static bool find_dict_CGFloat(CFDictionaryRef dict, CFStringRef name, CGFloat* value) {
    CFNumberRef num;
    return CFDictionaryGetValueIfPresent(dict, name, (const void**)&num)
        && CFNumberIsFloatType(num)
        && CFNumberGetValue(num, kCFNumberCGFloatType, value);
}

template <typename S, typename D, typename C> struct LinearInterpolater {
    struct Mapping {
        S src_val;
        D dst_val;
    };
    constexpr LinearInterpolater(Mapping const mapping[], int mappingCount)
        : fMapping(mapping), fMappingCount(mappingCount) {}

    static D map(S value, S src_min, S src_max, D dst_min, D dst_max) {
        SkASSERT(src_min < src_max);
        SkASSERT(dst_min <= dst_max);
        return C()(dst_min + (((value - src_min) * (dst_max - dst_min)) / (src_max - src_min)));
    }

    D map(S val) const {
        // -Inf to [0]
        if (val < fMapping[0].src_val) {
            return fMapping[0].dst_val;
        }

        // Linear from [i] to [i+1]
        for (int i = 0; i < fMappingCount - 1; ++i) {
            if (val < fMapping[i+1].src_val) {
                return map(val, fMapping[i].src_val, fMapping[i+1].src_val,
                                fMapping[i].dst_val, fMapping[i+1].dst_val);
            }
        }

        // From [n] to +Inf
        // if (fcweight < Inf)
        return fMapping[fMappingCount - 1].dst_val;
    }

    Mapping const * fMapping;
    int fMappingCount;
};

struct RoundCGFloatToInt {
    int operator()(CGFloat s) { return s + 0.5; }
};
struct CGFloatIdentity {
    CGFloat operator()(CGFloat s) { return s; }
};

/** Returns the [-1, 1] CTFontDescriptor weights for the
 *  <0, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000> CSS weights.
 *
 *  It is assumed that the values will be interpolated linearly between these points.
 *  NSFontWeightXXX were added in 10.11, appear in 10.10, but do not appear in 10.9.
 *  The actual values appear to be stable, but they may change in the future without notice.
 */
static CGFloat(&get_NSFontWeight_mapping())[11] {

    // Declarations in <AppKit/AppKit.h> on macOS, <UIKit/UIKit.h> on iOS
#ifdef SK_BUILD_FOR_MAC
#  define SK_KIT_FONT_WEIGHT_PREFIX "NS"
#endif
#ifdef SK_BUILD_FOR_IOS
#  define SK_KIT_FONT_WEIGHT_PREFIX "UI"
#endif
    static constexpr struct {
        CGFloat defaultValue;
        const char* name;
    } nsFontWeightLoaderInfos[] = {
        { -0.80f, SK_KIT_FONT_WEIGHT_PREFIX "FontWeightUltraLight" },
        { -0.60f, SK_KIT_FONT_WEIGHT_PREFIX "FontWeightThin" },
        { -0.40f, SK_KIT_FONT_WEIGHT_PREFIX "FontWeightLight" },
        {  0.00f, SK_KIT_FONT_WEIGHT_PREFIX "FontWeightRegular" },
        {  0.23f, SK_KIT_FONT_WEIGHT_PREFIX "FontWeightMedium" },
        {  0.30f, SK_KIT_FONT_WEIGHT_PREFIX "FontWeightSemibold" },
        {  0.40f, SK_KIT_FONT_WEIGHT_PREFIX "FontWeightBold" },
        {  0.56f, SK_KIT_FONT_WEIGHT_PREFIX "FontWeightHeavy" },
        {  0.62f, SK_KIT_FONT_WEIGHT_PREFIX "FontWeightBlack" },
    };

    static_assert(SK_ARRAY_COUNT(nsFontWeightLoaderInfos) == 9, "");
    static CGFloat nsFontWeights[11];
    static SkOnce once;
    once([&] {
        size_t i = 0;
        nsFontWeights[i++] = -1.00;
        for (const auto& nsFontWeightLoaderInfo : nsFontWeightLoaderInfos) {
            void* nsFontWeightValuePtr = dlsym(RTLD_DEFAULT, nsFontWeightLoaderInfo.name);
            if (nsFontWeightValuePtr) {
                nsFontWeights[i++] = *(static_cast<CGFloat*>(nsFontWeightValuePtr));
            } else {
                nsFontWeights[i++] = nsFontWeightLoaderInfo.defaultValue;
            }
        }
        nsFontWeights[i++] = 1.00;
    });
    return nsFontWeights;
}

/** Convert the [0, 1000] CSS weight to [-1, 1] CTFontDescriptor weight (for system fonts).
 *
 *  The -1 to 1 weights reported by CTFontDescriptors have different mappings depending on if the
 *  CTFont is native or created from a CGDataProvider.
 */
static CGFloat fontstyle_to_ct_weight(int fontstyleWeight) {
    using Interpolator = LinearInterpolater<int, CGFloat, CGFloatIdentity>;

    // Note that Mac supports the old OS2 version A so 0 through 10 are as if multiplied by 100.
    // However, on this end we can't tell, so this is ignored.

    static Interpolator::Mapping nativeWeightMappings[11];
    static SkOnce once;
    once([&] {
        CGFloat(&nsFontWeights)[11] = get_NSFontWeight_mapping();
        for (int i = 0; i < 11; ++i) {
            nativeWeightMappings[i].src_val = i * 100;
            nativeWeightMappings[i].dst_val = nsFontWeights[i];
        }
    });
    static constexpr Interpolator nativeInterpolator(
            nativeWeightMappings, SK_ARRAY_COUNT(nativeWeightMappings));

    return nativeInterpolator.map(fontstyleWeight);
}


/** Convert the [-1, 1] CTFontDescriptor weight to [0, 1000] CSS weight.
 *
 *  The -1 to 1 weights reported by CTFontDescriptors have different mappings depending on if the
 *  CTFont is native or created from a CGDataProvider.
 */
static int ct_weight_to_fontstyle(CGFloat cgWeight, bool fromDataProvider) {
    using Interpolator = LinearInterpolater<CGFloat, int, RoundCGFloatToInt>;

    // Note that Mac supports the old OS2 version A so 0 through 10 are as if multiplied by 100.
    // However, on this end we can't tell, so this is ignored.

    /** This mapping for CGDataProvider created fonts is determined by creating font data with every
     *  weight, creating a CTFont, and asking the CTFont for its weight. See the TypefaceStyle test
     *  in tests/TypefaceTest.cpp for the code used to determine these values.
     */
    static constexpr Interpolator::Mapping dataProviderWeightMappings[] = {
        { -1.00,    0 },
        { -0.70,  100 },
        { -0.50,  200 },
        { -0.23,  300 },
        {  0.00,  400 },
        {  0.20,  500 },
        {  0.30,  600 },
        {  0.40,  700 },
        {  0.60,  800 },
        {  0.80,  900 },
        {  1.00, 1000 },
    };
    static constexpr Interpolator dataProviderInterpolator(
            dataProviderWeightMappings, SK_ARRAY_COUNT(dataProviderWeightMappings));

    static Interpolator::Mapping nativeWeightMappings[11];
    static SkOnce once;
    once([&] {
        CGFloat(&nsFontWeights)[11] = get_NSFontWeight_mapping();
        for (int i = 0; i < 11; ++i) {
            nativeWeightMappings[i].src_val = nsFontWeights[i];
            nativeWeightMappings[i].dst_val = i * 100;
        }
    });
    static constexpr Interpolator nativeInterpolator(
            nativeWeightMappings, SK_ARRAY_COUNT(nativeWeightMappings));

    return fromDataProvider ? dataProviderInterpolator.map(cgWeight)
                            : nativeInterpolator.map(cgWeight);
}

/** Convert the [0, 10] CSS weight to [-1, 1] CTFontDescriptor width. */
static int fontstyle_to_ct_width(int fontstyleWidth) {
    using Interpolator = LinearInterpolater<int, CGFloat, CGFloatIdentity>;

    // Values determined by creating font data with every width, creating a CTFont,
    // and asking the CTFont for its width. See TypefaceStyle test for basics.
    static constexpr Interpolator::Mapping widthMappings[] = {
        {  0, -0.5 },
        { 10,  0.5 },
    };
    static constexpr Interpolator interpolator(widthMappings, SK_ARRAY_COUNT(widthMappings));
    return interpolator.map(fontstyleWidth);
}

/** Convert the [-1, 1] CTFontDescriptor width to [0, 10] CSS weight. */
static int ct_width_to_fontstyle(CGFloat cgWidth) {
    using Interpolator = LinearInterpolater<CGFloat, int, RoundCGFloatToInt>;

    // Values determined by creating font data with every width, creating a CTFont,
    // and asking the CTFont for its width. See TypefaceStyle test for basics.
    static constexpr Interpolator::Mapping widthMappings[] = {
        { -0.5,  0 },
        {  0.5, 10 },
    };
    static constexpr Interpolator interpolator(widthMappings, SK_ARRAY_COUNT(widthMappings));
    return interpolator.map(cgWidth);
}

static SkFontStyle fontstyle_from_descriptor(CTFontDescriptorRef desc, bool fromDataProvider) {
    SkUniqueCFRef<CFTypeRef> traits(CTFontDescriptorCopyAttribute(desc, kCTFontTraitsAttribute));
    if (!traits || CFDictionaryGetTypeID() != CFGetTypeID(traits.get())) {
        return SkFontStyle();
    }
    SkUniqueCFRef<CFDictionaryRef> fontTraitsDict(static_cast<CFDictionaryRef>(traits.release()));

    CGFloat weight, width, slant;
    if (!find_dict_CGFloat(fontTraitsDict.get(), kCTFontWeightTrait, &weight)) {
        weight = 0;
    }
    if (!find_dict_CGFloat(fontTraitsDict.get(), kCTFontWidthTrait, &width)) {
        width = 0;
    }
    if (!find_dict_CGFloat(fontTraitsDict.get(), kCTFontSlantTrait, &slant)) {
        slant = 0;
    }

    return SkFontStyle(ct_weight_to_fontstyle(weight, fromDataProvider),
                       ct_width_to_fontstyle(width),
                       slant ? SkFontStyle::kItalic_Slant
                             : SkFontStyle::kUpright_Slant);
}

struct OpszVariation {
    bool isSet = false;
    double value = 0;
};

class SkTypeface_Mac : public SkTypeface {
public:
    SkTypeface_Mac(SkUniqueCFRef<CTFontRef> fontRef, SkUniqueCFRef<CFTypeRef> resourceRef,
                   const SkFontStyle& fs, bool isFixedPitch, OpszVariation opszVariation,
                   std::unique_ptr<SkStreamAsset> providedData)
        : SkTypeface(fs, isFixedPitch)
        , fFontRef(std::move(fontRef))
        , fOriginatingCFTypeRef(std::move(resourceRef))
        , fOpszVariation(opszVariation)
        , fHasColorGlyphs(
                SkToBool(CTFontGetSymbolicTraits(fFontRef.get()) & kCTFontColorGlyphsTrait))
        , fStream(std::move(providedData))
        , fIsFromStream(fStream)
    {
        SkASSERT(fFontRef);
    }

    SkUniqueCFRef<CTFontRef> fFontRef;
    SkUniqueCFRef<CFTypeRef> fOriginatingCFTypeRef;
    const OpszVariation fOpszVariation;
    const bool fHasColorGlyphs;

protected:
    int onGetUPEM() const override;
    std::unique_ptr<SkStreamAsset> onOpenStream(int* ttcIndex) const override;
    std::unique_ptr<SkFontData> onMakeFontData() const override;
    int onGetVariationDesignPosition(SkFontArguments::VariationPosition::Coordinate coordinates[],
                                     int coordinateCount) const override;
    void onGetFamilyName(SkString* familyName) const override;
    SkTypeface::LocalizedStrings* onCreateFamilyNameIterator() const override;
    int onGetTableTags(SkFontTableTag tags[]) const override;
    size_t onGetTableData(SkFontTableTag, size_t offset, size_t length, void* data) const override;
    sk_sp<SkData> onCopyTableData(SkFontTableTag) const override;
    SkScalerContext* onCreateScalerContext(const SkScalerContextEffects&,
                                           const SkDescriptor*) const override;
    void onFilterRec(SkScalerContextRec*) const override;
    void onGetFontDescriptor(SkFontDescriptor*, bool*) const override;
    void getGlyphToUnicodeMap(SkUnichar*) const override;
    std::unique_ptr<SkAdvancedTypefaceMetrics> onGetAdvancedMetrics() const override;
    void onCharsToGlyphs(const SkUnichar* chars, int count, SkGlyphID glyphs[]) const override;
    int onCountGlyphs() const override;
    void getPostScriptGlyphNames(SkString*) const override {}
    int onGetVariationDesignParameters(SkFontParameters::Variation::Axis parameters[],
                                       int parameterCount) const override
    {
        return -1;
    }
    sk_sp<SkTypeface> onMakeClone(const SkFontArguments&) const override {
        return nullptr;
    }

    void* onGetCTFontRef() const override { return (void*)fFontRef.get(); }

private:
    mutable std::unique_ptr<SkStreamAsset> fStream;
    bool fIsFromStream;
    mutable SkOnce fInitStream;

    typedef SkTypeface INHERITED;
};

static bool find_by_CTFontRef(SkTypeface* cached, void* context) {
    CTFontRef self = (CTFontRef)context;
    CTFontRef other = (CTFontRef)cached->internal_private_getCTFontRef();

    return CFEqual(self, other);
}

/** Creates a typeface, searching the cache if isLocalStream is false. */
static sk_sp<SkTypeface> create_from_CTFontRef(SkUniqueCFRef<CTFontRef> font,
                                               SkUniqueCFRef<CFTypeRef> resource,
                                               OpszVariation opszVariation,
                                               std::unique_ptr<SkStreamAsset> providedData) {
    SkASSERT(font);
    const bool isFromStream(providedData);

    if (!isFromStream) {
        sk_sp<SkTypeface> face = SkTypefaceCache::FindByProcAndRef(find_by_CTFontRef,
                                                                   (void*)font.get());
        if (face) {
            return face;
        }
    }

    SkUniqueCFRef<CTFontDescriptorRef> desc(CTFontCopyFontDescriptor(font.get()));
    SkFontStyle style = fontstyle_from_descriptor(desc.get(), isFromStream);
    CTFontSymbolicTraits traits = CTFontGetSymbolicTraits(font.get());
    bool isFixedPitch = SkToBool(traits & kCTFontMonoSpaceTrait);

    sk_sp<SkTypeface> face(new SkTypeface_Mac(std::move(font), std::move(resource),
                                              style, isFixedPitch, opszVariation,
                                              std::move(providedData)));
    if (!isFromStream) {
        SkTypefaceCache::Add(face);
    }
    return face;
}

/** Creates a typeface from a descriptor, searching the cache. */
static sk_sp<SkTypeface> create_from_desc(CTFontDescriptorRef desc) {
    SkUniqueCFRef<CTFontRef> ctFont(CTFontCreateWithFontDescriptor(desc, 0, nullptr));
    if (!ctFont) {
        return nullptr;
    }

    return create_from_CTFontRef(std::move(ctFont), nullptr, OpszVariation(), nullptr);
}

static SkUniqueCFRef<CTFontDescriptorRef> create_descriptor(const char familyName[],
                                                            const SkFontStyle& style) {
    SkUniqueCFRef<CFMutableDictionaryRef> cfAttributes(
            CFDictionaryCreateMutable(kCFAllocatorDefault, 0,
                                      &kCFTypeDictionaryKeyCallBacks,
                                      &kCFTypeDictionaryValueCallBacks));

    SkUniqueCFRef<CFMutableDictionaryRef> cfTraits(
            CFDictionaryCreateMutable(kCFAllocatorDefault, 0,
                                      &kCFTypeDictionaryKeyCallBacks,
                                      &kCFTypeDictionaryValueCallBacks));

    if (!cfAttributes || !cfTraits) {
        return nullptr;
    }

    // CTFontTraits (symbolic)
    // macOS 14 and iOS 12 seem to behave badly when kCTFontSymbolicTrait is set.

    // CTFontTraits (weight)
    CGFloat ctWeight = fontstyle_to_ct_weight(style.weight());
    SkUniqueCFRef<CFNumberRef> cfFontWeight(
            CFNumberCreate(kCFAllocatorDefault, kCFNumberCGFloatType, &ctWeight));
    if (cfFontWeight) {
        CFDictionaryAddValue(cfTraits.get(), kCTFontWeightTrait, cfFontWeight.get());
    }
    // CTFontTraits (width)
    CGFloat ctWidth = fontstyle_to_ct_width(style.width());
    SkUniqueCFRef<CFNumberRef> cfFontWidth(
            CFNumberCreate(kCFAllocatorDefault, kCFNumberCGFloatType, &ctWidth));
    if (cfFontWidth) {
        CFDictionaryAddValue(cfTraits.get(), kCTFontWidthTrait, cfFontWidth.get());
    }
    // CTFontTraits (slant)
    CGFloat ctSlant = style.slant() == SkFontStyle::kUpright_Slant ? 0 : 1;
    SkUniqueCFRef<CFNumberRef> cfFontSlant(
            CFNumberCreate(kCFAllocatorDefault, kCFNumberCGFloatType, &ctSlant));
    if (cfFontSlant) {
        CFDictionaryAddValue(cfTraits.get(), kCTFontSlantTrait, cfFontSlant.get());
    }
    // CTFontTraits
    CFDictionaryAddValue(cfAttributes.get(), kCTFontTraitsAttribute, cfTraits.get());

    // CTFontFamilyName
    if (familyName) {
        SkUniqueCFRef<CFStringRef> cfFontName = make_CFString(familyName);
        if (cfFontName) {
            CFDictionaryAddValue(cfAttributes.get(), kCTFontFamilyNameAttribute, cfFontName.get());
        }
    }

    return SkUniqueCFRef<CTFontDescriptorRef>(
            CTFontDescriptorCreateWithAttributes(cfAttributes.get()));
}

// Same as the above function except style is included so we can
// compare whether the created font conforms to the style. If not, we need
// to recreate the font with symbolic traits. This is needed due to MacOS 10.11
// font creation problem https://bugs.chromium.org/p/skia/issues/detail?id=8447.
static sk_sp<SkTypeface> create_from_desc_and_style(CTFontDescriptorRef desc,
                                                    const SkFontStyle& style) {
    SkUniqueCFRef<CTFontRef> ctFont(CTFontCreateWithFontDescriptor(desc, 0, nullptr));
    if (!ctFont) {
        return nullptr;
    }

    const CTFontSymbolicTraits traits = CTFontGetSymbolicTraits(ctFont.get());
    CTFontSymbolicTraits expected_traits = traits;
    if (style.slant() != SkFontStyle::kUpright_Slant) {
        expected_traits |= kCTFontItalicTrait;
    }
    if (style.weight() >= SkFontStyle::kBold_Weight) {
        expected_traits |= kCTFontBoldTrait;
    }

    if (expected_traits != traits) {
        SkUniqueCFRef<CTFontRef> ctNewFont(CTFontCreateCopyWithSymbolicTraits(
                    ctFont.get(), 0, nullptr, expected_traits, expected_traits));
        if (ctNewFont) {
            ctFont = std::move(ctNewFont);
        }
    }

    return create_from_CTFontRef(std::move(ctFont), nullptr, OpszVariation(), nullptr);
}

/** Creates a typeface from a name, searching the cache. */
static sk_sp<SkTypeface> create_from_name(const char familyName[], const SkFontStyle& style) {
    SkUniqueCFRef<CTFontDescriptorRef> desc = create_descriptor(familyName, style);
    if (!desc) {
        return nullptr;
    }
    return create_from_desc_and_style(desc.get(), style);
}

///////////////////////////////////////////////////////////////////////////////

/*  This function is visible on the outside. It first searches the cache, and if
 *  not found, returns a new entry (after adding it to the cache).
 */
SkTypeface* SkCreateTypefaceFromCTFont(CTFontRef font, CFTypeRef resource) {
    CFRetain(font);
    if (resource) {
        CFRetain(resource);
    }
    return create_from_CTFontRef(SkUniqueCFRef<CTFontRef>(font),
                                 SkUniqueCFRef<CFTypeRef>(resource),
                                 OpszVariation(),
                                 nullptr).release();
}

static const char* map_css_names(const char* name) {
    static const struct {
        const char* fFrom;  // name the caller specified
        const char* fTo;    // "canonical" name we map to
    } gPairs[] = {
        { "sans-serif", "Helvetica" },
        { "serif",      "Times"     },
        { "monospace",  "Courier"   }
    };

    for (size_t i = 0; i < SK_ARRAY_COUNT(gPairs); i++) {
        if (strcmp(name, gPairs[i].fFrom) == 0) {
            return gPairs[i].fTo;
        }
    }
    return name;    // no change
}

///////////////////////////////////////////////////////////////////////////////

class SkScalerContext_Mac : public SkScalerContext {
public:
    SkScalerContext_Mac(sk_sp<SkTypeface_Mac>, const SkScalerContextEffects&, const SkDescriptor*);

protected:
    unsigned generateGlyphCount(void) override;
    bool generateAdvance(SkGlyph* glyph) override;
    void generateMetrics(SkGlyph* glyph) override;
    void generateImage(const SkGlyph& glyph) override;
    bool generatePath(SkGlyphID glyph, SkPath* path) override;
    void generateFontMetrics(SkFontMetrics*) override;

private:
    static void CTPathElement(void *info, const CGPathElement *element);
    template<bool APPLY_PREBLEND>
    static void RGBToA8(const CGRGBPixel* SK_RESTRICT cgPixels, size_t cgRowBytes,
                        const SkGlyph& glyph, const uint8_t* table8);
    template<bool APPLY_PREBLEND>
    static uint16_t RGBToLcd16(CGRGBPixel rgb, const uint8_t* tableR,
                               const uint8_t* tableG,
                               const uint8_t* tableB);
    template<bool APPLY_PREBLEND>
    static void RGBToLcd16(const CGRGBPixel* SK_RESTRICT cgPixels,
                           size_t cgRowBytes,
                           const SkGlyph& glyph,
                           const uint8_t* tableR,
                           const uint8_t* tableG,
                           const uint8_t* tableB);

    Offscreen fOffscreen;

    /** Unrotated variant of fCTFont.
     *
     *  In 10.10.1 CTFontGetAdvancesForGlyphs applies the font transform to the width of the
     *  advances, but always sets the height to 0. This font is used to get the advances of the
     *  unrotated glyph, and then the rotation is applied separately.
     *
     *  CT vertical metrics are pre-rotated (in em space, before transform) 90deg clock-wise.
     *  This makes kCTFontOrientationDefault dangerous, because the metrics from
     *  kCTFontOrientationHorizontal are in a different space from kCTFontOrientationVertical.
     *  With kCTFontOrientationVertical the advances must be unrotated.
     *
     *  Sometimes, creating a copy of a CTFont with the same size but different trasform will select
     *  different underlying font data. As a result, avoid ever creating more than one CTFont per
     *  SkScalerContext to ensure that only one CTFont is used.
     *
     *  As a result of the above (and other constraints) this font contains the size, but not the
     *  transform. The transform must always be applied separately.
     */
    SkUniqueCFRef<CTFontRef> fCTFont;

    /** The transform without the font size. */
    CGAffineTransform fTransform;
    CGAffineTransform fInvTransform;

    SkUniqueCFRef<CGFontRef> fCGFont;
    uint16_t fGlyphCount;
    const bool fDoSubPosition;

    friend class Offscreen;

    typedef SkScalerContext INHERITED;
};

// In macOS 10.12 and later any variation on the CGFont which has default axis value will be
// dropped when creating the CTFont. Unfortunately, in macOS 10.15 the priority of setting
// the optical size (and opsz variation) is
// 1. the value of kCTFontOpticalSizeAttribute in the CTFontDescriptor (undocumented)
// 2. the opsz axis default value if kCTFontOpticalSizeAttribute is 'none' (undocumented)
// 3. the opsz variation on the nascent CTFont from the CGFont (was dropped if default)
// 4. the opsz variation in kCTFontVariationAttribute in CTFontDescriptor (crashes 10.10)
// 5. the size requested (can fudge in SkTypeface but not SkScalerContext)
// The first one which is found will be used to set the opsz variation (after clamping).
static SkUniqueCFRef<CTFontDescriptorRef> create_opsz_descriptor(double opsz) {
    SkUniqueCFRef<CFMutableDictionaryRef> attr(
            CFDictionaryCreateMutable(kCFAllocatorDefault, 1,
                                      &kCFTypeDictionaryKeyCallBacks,
                                      &kCFTypeDictionaryValueCallBacks));
    SkUniqueCFRef<CFNumberRef> opszValueNumber(
        CFNumberCreate(kCFAllocatorDefault, kCFNumberDoubleType, &opsz));
    // Avoid using kCTFontOpticalSizeAttribute directly
    CFStringRef SkCTFontOpticalSizeAttribute = CFSTR("NSCTFontOpticalSizeAttribute");
    CFDictionarySetValue(attr.get(), SkCTFontOpticalSizeAttribute, opszValueNumber.get());
    return SkUniqueCFRef<CTFontDescriptorRef>(CTFontDescriptorCreateWithAttributes(attr.get()));
}

// CTFontCreateCopyWithAttributes or CTFontCreateCopyWithSymbolicTraits cannot be used on 10.10
// and later, as they will return different underlying fonts depending on the size requested.
// It is not possible to use descriptors with CTFontCreateWithFontDescriptor, since that does not
// work with non-system fonts. As a result, create the strike specific CTFonts from the underlying
// CGFont.
static SkUniqueCFRef<CTFontRef> ctfont_create_exact_copy(CTFontRef baseFont, CGFloat textSize,
                                                         OpszVariation opsz)
{
    SkUniqueCFRef<CGFontRef> baseCGFont(CTFontCopyGraphicsFont(baseFont, nullptr));

    // The last parameter (CTFontDescriptorRef attributes) *must* not set variations.
    // If it sets variations then with fonts with variation axes the copy will fail in
    // CGFontVariationFromDictCallback when it assumes kCGFontVariationAxisName is CFNumberRef
    // which it quite obviously is not.

    // Because we cannot setup the CTFont descriptor to match, the same restriction applies here
    // as other uses of CTFontCreateWithGraphicsFont which is that such CTFonts should not escape
    // the scaler context, since they aren't 'normal'.

    SkUniqueCFRef<CTFontDescriptorRef> desc;
    if (opsz.isSet) {
        desc = create_opsz_descriptor(opsz.value);
    }
    return SkUniqueCFRef<CTFontRef>(
            CTFontCreateWithGraphicsFont(baseCGFont.get(), textSize, nullptr, desc.get()));
}

SkScalerContext_Mac::SkScalerContext_Mac(sk_sp<SkTypeface_Mac> typeface,
                                         const SkScalerContextEffects& effects,
                                         const SkDescriptor* desc)
        : INHERITED(std::move(typeface), effects, desc)
        , fDoSubPosition(SkToBool(fRec.fFlags & kSubpixelPositioning_Flag))

{
    CTFontRef ctFont = (CTFontRef)this->getTypeface()->internal_private_getCTFontRef();
    CFIndex numGlyphs = CTFontGetGlyphCount(ctFont);
    SkASSERT(numGlyphs >= 1 && numGlyphs <= 0xFFFF);
    fGlyphCount = SkToU16(numGlyphs);

    // CT on (at least) 10.9 will size color glyphs down from the requested size, but not up.
    // As a result, it is necessary to know the actual device size and request that.
    SkVector scale;
    SkMatrix skTransform;
    bool invertible = fRec.computeMatrices(SkScalerContextRec::kVertical_PreMatrixScale,
                                           &scale, &skTransform, nullptr, nullptr, nullptr);
    fTransform = MatrixToCGAffineTransform(skTransform);
    // CGAffineTransformInvert documents that if the transform is non-invertible it will return the
    // passed transform unchanged. It does so, but then also prints a message to stdout. Avoid this.
    if (invertible) {
        fInvTransform = CGAffineTransformInvert(fTransform);
    } else {
        fInvTransform = fTransform;
    }

    // The transform contains everything except the requested text size.
    // Some properties, like 'trak', are based on the text size (before applying the matrix).
    CGFloat textSize = ScalarToCG(scale.y());
    fCTFont = ctfont_create_exact_copy(ctFont, textSize,
                                       ((SkTypeface_Mac*)this->getTypeface())->fOpszVariation);
    fCGFont.reset(CTFontCopyGraphicsFont(fCTFont.get(), nullptr));
}

CGRGBPixel* Offscreen::getCG(const SkScalerContext_Mac& context, const SkGlyph& glyph,
                             CGGlyph glyphID, size_t* rowBytesPtr,
                             bool generateA8FromLCD) {
    if (!fRGBSpace) {
        //It doesn't appear to matter what color space is specified.
        //Regular blends and antialiased text are always (s*a + d*(1-a))
        //and subpixel antialiased text is always g=2.0.
        fRGBSpace.reset(CGColorSpaceCreateDeviceRGB());
    }

    // default to kBW_Format
    bool doAA = false;
    bool doLCD = false;

    if (SkMask::kBW_Format != glyph.maskFormat()) {
        doLCD = true;
        doAA = true;
    }

    // FIXME: lcd smoothed un-hinted rasterization unsupported.
    if (!generateA8FromLCD && SkMask::kA8_Format == glyph.maskFormat()) {
        doLCD = false;
        doAA = true;
    }

    // If this font might have color glyphs, disable LCD as there's no way to support it.
    // CoreText doesn't tell us which format it ended up using, so we can't detect it.
    // A8 will end up black on transparent, but TODO: we can detect gray and set to A8.
    if (SkMask::kARGB32_Format == glyph.maskFormat()) {
        doLCD = false;
    }

    size_t rowBytes = fSize.fWidth * sizeof(CGRGBPixel);
    if (!fCG || fSize.fWidth < glyph.width() || fSize.fHeight < glyph.height()) {
        if (fSize.fWidth < glyph.width()) {
            fSize.fWidth = RoundSize(glyph.width());
        }
        if (fSize.fHeight < glyph.height()) {
            fSize.fHeight = RoundSize(glyph.height());
        }

        rowBytes = fSize.fWidth * sizeof(CGRGBPixel);
        void* image = fImageStorage.reset(rowBytes * fSize.fHeight);
        const CGImageAlphaInfo alpha = (glyph.isColor())
                                     ? kCGImageAlphaPremultipliedFirst
                                     : kCGImageAlphaNoneSkipFirst;
        const CGBitmapInfo bitmapInfo = kCGBitmapByteOrder32Host | alpha;
        fCG.reset(CGBitmapContextCreate(image, fSize.fWidth, fSize.fHeight, 8,
                                        rowBytes, fRGBSpace.get(), bitmapInfo));

        // Skia handles quantization and subpixel positioning,
        // so disable quantization and enabe subpixel positioning in CG.
        CGContextSetAllowsFontSubpixelQuantization(fCG.get(), false);
        CGContextSetShouldSubpixelQuantizeFonts(fCG.get(), false);

        // Because CG always draws from the horizontal baseline,
        // if there is a non-integral translation from the horizontal origin to the vertical origin,
        // then CG cannot draw the glyph in the correct location without subpixel positioning.
        CGContextSetAllowsFontSubpixelPositioning(fCG.get(), true);
        CGContextSetShouldSubpixelPositionFonts(fCG.get(), true);

        CGContextSetTextDrawingMode(fCG.get(), kCGTextFill);

        // Draw black on white to create mask. (Special path exists to speed this up in CG.)
        CGContextSetGrayFillColor(fCG.get(), 0.0f, 1.0f);

        // force our checks below to happen
        fDoAA = !doAA;
        fDoLCD = !doLCD;

        CGContextSetTextMatrix(fCG.get(), context.fTransform);
    }

    if (fDoAA != doAA) {
        CGContextSetShouldAntialias(fCG.get(), doAA);
        fDoAA = doAA;
    }
    if (fDoLCD != doLCD) {
        CGContextSetShouldSmoothFonts(fCG.get(), doLCD);
        fDoLCD = doLCD;
    }

    CGRGBPixel* image = (CGRGBPixel*)fImageStorage.get();
    // skip rows based on the glyph's height
    image += (fSize.fHeight - glyph.height()) * fSize.fWidth;

    // Erase to white (or transparent black if it's a color glyph, to not composite against white).
    uint32_t bgColor = (!glyph.isColor()) ? 0xFFFFFFFF : 0x00000000;
    sk_memset_rect32(image, bgColor, glyph.width(), glyph.height(), rowBytes);

    float subX = 0;
    float subY = 0;
    if (context.fDoSubPosition) {
        subX = SkFixedToFloat(glyph.getSubXFixed());
        subY = SkFixedToFloat(glyph.getSubYFixed());
    }

    CGPoint point = CGPointMake(-glyph.left() + subX, glyph.top() + glyph.height() - subY);
    // Prior to 10.10, CTFontDrawGlyphs acted like CGContextShowGlyphsAtPositions and took
    // 'positions' which are in text space. The glyph location (in device space) must be
    // mapped into text space, so that CG can convert it back into device space.
    // In 10.10.1, this is handled directly in CTFontDrawGlyphs.
    //
    // However, in 10.10.2 color glyphs no longer rotate based on the font transform.
    // So always make the font transform identity and place the transform on the context.
    point = CGPointApplyAffineTransform(point, context.fInvTransform);

    CTFontDrawGlyphs(context.fCTFont.get(), &glyphID, &point, 1, fCG.get());

    SkASSERT(rowBytesPtr);
    *rowBytesPtr = rowBytes;
    return image;
}

unsigned SkScalerContext_Mac::generateGlyphCount(void) {
    return fGlyphCount;
}

bool SkScalerContext_Mac::generateAdvance(SkGlyph* glyph) {
    return false;
}

void SkScalerContext_Mac::generateMetrics(SkGlyph* glyph) {
    glyph->fMaskFormat = fRec.fMaskFormat;

    const CGGlyph cgGlyph = (CGGlyph) glyph->getGlyphID();
    glyph->zeroMetrics();

    // The following block produces cgAdvance in CG units (pixels, y up).
    CGSize cgAdvance;
    CTFontGetAdvancesForGlyphs(fCTFont.get(), kCTFontOrientationHorizontal,
                               &cgGlyph, &cgAdvance, 1);
    cgAdvance = CGSizeApplyAffineTransform(cgAdvance, fTransform);
    glyph->fAdvanceX =  CGToFloat(cgAdvance.width);
    glyph->fAdvanceY = -CGToFloat(cgAdvance.height);

    // The following produces skBounds in SkGlyph units (pixels, y down),
    // or returns early if skBounds would be empty.
    SkRect skBounds;

    // Glyphs are always drawn from the horizontal origin. The caller must manually use the result
    // of CTFontGetVerticalTranslationsForGlyphs to calculate where to draw the glyph for vertical
    // glyphs. As a result, always get the horizontal bounds of a glyph and translate it if the
    // glyph is vertical. This avoids any diagreement between the various means of retrieving
    // vertical metrics.
    {
        // CTFontGetBoundingRectsForGlyphs produces cgBounds in CG units (pixels, y up).
        CGRect cgBounds;
        CTFontGetBoundingRectsForGlyphs(fCTFont.get(), kCTFontOrientationHorizontal,
                                        &cgGlyph, &cgBounds, 1);
        cgBounds = CGRectApplyAffineTransform(cgBounds, fTransform);

        // BUG?
        // 0x200B (zero-advance space) seems to return a huge (garbage) bounds, when
        // it should be empty. So, if we see a zero-advance, we check if it has an
        // empty path or not, and if so, we jam the bounds to 0. Hopefully a zero-advance
        // is rare, so we won't incur a big performance cost for this extra check.
        if (0 == cgAdvance.width && 0 == cgAdvance.height) {
            SkUniqueCFRef<CGPathRef> path(CTFontCreatePathForGlyph(fCTFont.get(), cgGlyph,nullptr));
            if (!path || CGPathIsEmpty(path.get())) {
                return;
            }
        }

        if (CGRectIsEmpty_inline(cgBounds)) {
            return;
        }

        // Convert cgBounds to SkGlyph units (pixels, y down).
        skBounds = SkRect::MakeXYWH(cgBounds.origin.x, -cgBounds.origin.y - cgBounds.size.height,
                                    cgBounds.size.width, cgBounds.size.height);
    }

    // Currently the bounds are based on being rendered at (0,0).
    // The top left must not move, since that is the base from which subpixel positioning is offset.
    if (fDoSubPosition) {
        skBounds.fRight += SkFixedToFloat(glyph->getSubXFixed());
        skBounds.fBottom += SkFixedToFloat(glyph->getSubYFixed());
    }

    // We're trying to pack left and top into int16_t,
    // and width and height into uint16_t, after outsetting by 1.
    if (!SkRect::MakeXYWH(-32767, -32767, 65535, 65535).contains(skBounds)) {
        return;
    }

    SkIRect skIBounds;
    skBounds.roundOut(&skIBounds);
    // Expand the bounds by 1 pixel, to give CG room for anti-aliasing.
    // Note that this outset is to allow room for LCD smoothed glyphs. However, the correct outset
    // is not currently known, as CG dilates the outlines by some percentage.
    // Note that if this context is A8 and not back-forming from LCD, there is no need to outset.
    skIBounds.outset(1, 1);
    glyph->fLeft = SkToS16(skIBounds.fLeft);
    glyph->fTop = SkToS16(skIBounds.fTop);
    glyph->fWidth = SkToU16(skIBounds.width());
    glyph->fHeight = SkToU16(skIBounds.height());
}

static constexpr uint8_t sk_pow2_table(size_t i) {
    return SkToU8(((i * i + 128) / 255));
}

/**
 *  This will invert the gamma applied by CoreGraphics, so we can get linear
 *  values.
 *
 *  CoreGraphics obscurely defaults to 2.0 as the subpixel coverage gamma value.
 *  The color space used does not appear to affect this choice.
 */
static constexpr auto gLinearCoverageFromCGLCDValue = SkMakeArray<256>(sk_pow2_table);

static void cgpixels_to_bits(uint8_t dst[], const CGRGBPixel src[], int count) {
    while (count > 0) {
        uint8_t mask = 0;
        for (int i = 7; i >= 0; --i) {
            mask |= ((CGRGBPixel_getAlpha(*src++) >> 7) ^ 0x1) << i;
            if (0 == --count) {
                break;
            }
        }
        *dst++ = mask;
    }
}

template<bool APPLY_PREBLEND>
static inline uint8_t rgb_to_a8(CGRGBPixel rgb, const uint8_t* table8) {
    U8CPU r = 0xFF - ((rgb >> 16) & 0xFF);
    U8CPU g = 0xFF - ((rgb >>  8) & 0xFF);
    U8CPU b = 0xFF - ((rgb >>  0) & 0xFF);
    U8CPU lum = sk_apply_lut_if<APPLY_PREBLEND>(SkComputeLuminance(r, g, b), table8);
#if SK_SHOW_TEXT_BLIT_COVERAGE
    lum = SkTMax(lum, (U8CPU)0x30);
#endif
    return lum;
}

template<bool APPLY_PREBLEND>
void SkScalerContext_Mac::RGBToA8(const CGRGBPixel* SK_RESTRICT cgPixels, size_t cgRowBytes,
                                  const SkGlyph& glyph, const uint8_t* table8) {
    const int width = glyph.fWidth;
    size_t dstRB = glyph.rowBytes();
    uint8_t* SK_RESTRICT dst = (uint8_t*)glyph.fImage;

    for (int y = 0; y < glyph.fHeight; y++) {
        for (int i = 0; i < width; ++i) {
            dst[i] = rgb_to_a8<APPLY_PREBLEND>(cgPixels[i], table8);
        }
        cgPixels = SkTAddOffset<const CGRGBPixel>(cgPixels, cgRowBytes);
        dst = SkTAddOffset<uint8_t>(dst, dstRB);
    }
}

template<bool APPLY_PREBLEND>
uint16_t SkScalerContext_Mac::RGBToLcd16(CGRGBPixel rgb, const uint8_t* tableR,
                                         const uint8_t* tableG,
                                         const uint8_t* tableB) {
    U8CPU r = sk_apply_lut_if<APPLY_PREBLEND>(0xFF - ((rgb >> 16) & 0xFF), tableR);
    U8CPU g = sk_apply_lut_if<APPLY_PREBLEND>(0xFF - ((rgb >>  8) & 0xFF), tableG);
    U8CPU b = sk_apply_lut_if<APPLY_PREBLEND>(0xFF - ((rgb >>  0) & 0xFF), tableB);
#if SK_SHOW_TEXT_BLIT_COVERAGE
    r = SkTMax(r, (U8CPU)0x30);
    g = SkTMax(g, (U8CPU)0x30);
    b = SkTMax(b, (U8CPU)0x30);
#endif
    return SkPack888ToRGB16(r, g, b);
}

template<bool APPLY_PREBLEND>
void SkScalerContext_Mac::RGBToLcd16(const CGRGBPixel* SK_RESTRICT cgPixels,
                                     size_t cgRowBytes,
                                     const SkGlyph& glyph,
                                     const uint8_t* tableR,
                                     const uint8_t* tableG,
                                     const uint8_t* tableB) {
    const int width = glyph.fWidth;
    size_t dstRB = glyph.rowBytes();
    uint16_t* SK_RESTRICT dst = (uint16_t*)glyph.fImage;

    for (int y = 0; y < glyph.fHeight; y++) {
        for (int i = 0; i < width; i++) {
            dst[i] = RGBToLcd16<APPLY_PREBLEND>(cgPixels[i], tableR, tableG, tableB);
        }
        cgPixels = SkTAddOffset<const CGRGBPixel>(cgPixels, cgRowBytes);
        dst = SkTAddOffset<uint16_t>(dst, dstRB);
    }
}

static SkPMColor cgpixels_to_pmcolor(CGRGBPixel rgb) {
    U8CPU a = (rgb >> 24) & 0xFF;
    U8CPU r = (rgb >> 16) & 0xFF;
    U8CPU g = (rgb >>  8) & 0xFF;
    U8CPU b = (rgb >>  0) & 0xFF;
#if SK_SHOW_TEXT_BLIT_COVERAGE
    a = SkTMax(a, (U8CPU)0x30);
#endif
    return SkPackARGB32(a, r, g, b);
}

void SkScalerContext_Mac::generateImage(const SkGlyph& glyph) {
    CGGlyph cgGlyph = SkTo<CGGlyph>(glyph.getGlyphID());

    // FIXME: lcd smoothed un-hinted rasterization unsupported.
    bool requestSmooth = fRec.getHinting() != SkFontHinting::kNone;

    // Draw the glyph
    size_t cgRowBytes;
    CGRGBPixel* cgPixels = fOffscreen.getCG(*this, glyph, cgGlyph, &cgRowBytes, requestSmooth);
    if (cgPixels == nullptr) {
        return;
    }

    // Fix the glyph
    if ((glyph.fMaskFormat == SkMask::kLCD16_Format) ||
        (glyph.fMaskFormat == SkMask::kA8_Format
         && requestSmooth
         && smooth_behavior() != SmoothBehavior::none))
    {
        const uint8_t* linear = gLinearCoverageFromCGLCDValue.data();

        //Note that the following cannot really be integrated into the
        //pre-blend, since we may not be applying the pre-blend; when we aren't
        //applying the pre-blend it means that a filter wants linear anyway.
        //Other code may also be applying the pre-blend, so we'd need another
        //one with this and one without.
        CGRGBPixel* addr = cgPixels;
        for (int y = 0; y < glyph.fHeight; ++y) {
            for (int x = 0; x < glyph.fWidth; ++x) {
                int r = (addr[x] >> 16) & 0xFF;
                int g = (addr[x] >>  8) & 0xFF;
                int b = (addr[x] >>  0) & 0xFF;
                addr[x] = (linear[r] << 16) | (linear[g] << 8) | linear[b];
            }
            addr = SkTAddOffset<CGRGBPixel>(addr, cgRowBytes);
        }
    }

    // Convert glyph to mask
    switch (glyph.fMaskFormat) {
        case SkMask::kLCD16_Format: {
            if (fPreBlend.isApplicable()) {
                RGBToLcd16<true>(cgPixels, cgRowBytes, glyph,
                                 fPreBlend.fR, fPreBlend.fG, fPreBlend.fB);
            } else {
                RGBToLcd16<false>(cgPixels, cgRowBytes, glyph,
                                  fPreBlend.fR, fPreBlend.fG, fPreBlend.fB);
            }
        } break;
        case SkMask::kA8_Format: {
            if (fPreBlend.isApplicable()) {
                RGBToA8<true>(cgPixels, cgRowBytes, glyph, fPreBlend.fG);
            } else {
                RGBToA8<false>(cgPixels, cgRowBytes, glyph, fPreBlend.fG);
            }
        } break;
        case SkMask::kBW_Format: {
            const int width = glyph.fWidth;
            size_t dstRB = glyph.rowBytes();
            uint8_t* dst = (uint8_t*)glyph.fImage;
            for (int y = 0; y < glyph.fHeight; y++) {
                cgpixels_to_bits(dst, cgPixels, width);
                cgPixels = SkTAddOffset<CGRGBPixel>(cgPixels, cgRowBytes);
                dst = SkTAddOffset<uint8_t>(dst, dstRB);
            }
        } break;
        case SkMask::kARGB32_Format: {
            const int width = glyph.fWidth;
            size_t dstRB = glyph.rowBytes();
            SkPMColor* dst = (SkPMColor*)glyph.fImage;
            for (int y = 0; y < glyph.fHeight; y++) {
                for (int x = 0; x < width; ++x) {
                    dst[x] = cgpixels_to_pmcolor(cgPixels[x]);
                }
                cgPixels = SkTAddOffset<CGRGBPixel>(cgPixels, cgRowBytes);
                dst = SkTAddOffset<SkPMColor>(dst, dstRB);
            }
        } break;
        default:
            SkDEBUGFAIL("unexpected mask format");
            break;
    }
}

/*
 *  Our subpixel resolution is only 2 bits in each direction, so a scale of 4
 *  seems sufficient, and possibly even correct, to allow the hinted outline
 *  to be subpixel positioned.
 */
#define kScaleForSubPixelPositionHinting (4.0f)

bool SkScalerContext_Mac::generatePath(SkGlyphID glyph, SkPath* path) {
    SkScalar scaleX = SK_Scalar1;
    SkScalar scaleY = SK_Scalar1;

    CGAffineTransform xform = fTransform;
    /*
     *  For subpixel positioning, we want to return an unhinted outline, so it
     *  can be positioned nicely at fractional offsets. However, we special-case
     *  if the baseline of the (horizontal) text is axis-aligned. In those cases
     *  we want to retain hinting in the direction orthogonal to the baseline.
     *  e.g. for horizontal baseline, we want to retain hinting in Y.
     *  The way we remove hinting is to scale the font by some value (4) in that
     *  direction, ask for the path, and then scale the path back down.
     */
    if (fDoSubPosition) {
        // start out by assuming that we want no hining in X and Y
        scaleX = scaleY = kScaleForSubPixelPositionHinting;
        // now see if we need to restore hinting for axis-aligned baselines
        switch (this->computeAxisAlignmentForHText()) {
            case kX_SkAxisAlignment:
                scaleY = SK_Scalar1; // want hinting in the Y direction
                break;
            case kY_SkAxisAlignment:
                scaleX = SK_Scalar1; // want hinting in the X direction
                break;
            default:
                break;
        }

        CGAffineTransform scale(CGAffineTransformMakeScale(ScalarToCG(scaleX), ScalarToCG(scaleY)));
        xform = CGAffineTransformConcat(fTransform, scale);
    }

    CGGlyph cgGlyph = SkTo<CGGlyph>(glyph);
    SkUniqueCFRef<CGPathRef> cgPath(CTFontCreatePathForGlyph(fCTFont.get(), cgGlyph, &xform));

    path->reset();
    if (!cgPath) {
        return false;
    }

    CGPathApply(cgPath.get(), path, SkScalerContext_Mac::CTPathElement);
    if (fDoSubPosition) {
        SkMatrix m;
        m.setScale(SkScalarInvert(scaleX), SkScalarInvert(scaleY));
        path->transform(m);
    }
    return true;
}

void SkScalerContext_Mac::generateFontMetrics(SkFontMetrics* metrics) {
    if (nullptr == metrics) {
        return;
    }

    CGRect theBounds = CTFontGetBoundingBox(fCTFont.get());

    metrics->fTop          = CGToScalar(-CGRectGetMaxY_inline(theBounds));
    metrics->fAscent       = CGToScalar(-CTFontGetAscent(fCTFont.get()));
    metrics->fDescent      = CGToScalar( CTFontGetDescent(fCTFont.get()));
    metrics->fBottom       = CGToScalar(-CGRectGetMinY_inline(theBounds));
    metrics->fLeading      = CGToScalar( CTFontGetLeading(fCTFont.get()));
    metrics->fAvgCharWidth = CGToScalar( CGRectGetWidth_inline(theBounds));
    metrics->fXMin         = CGToScalar( CGRectGetMinX_inline(theBounds));
    metrics->fXMax         = CGToScalar( CGRectGetMaxX_inline(theBounds));
    metrics->fMaxCharWidth = metrics->fXMax - metrics->fXMin;
    metrics->fXHeight      = CGToScalar( CTFontGetXHeight(fCTFont.get()));
    metrics->fCapHeight    = CGToScalar( CTFontGetCapHeight(fCTFont.get()));
    metrics->fUnderlineThickness = CGToScalar( CTFontGetUnderlineThickness(fCTFont.get()));
    metrics->fUnderlinePosition = -CGToScalar( CTFontGetUnderlinePosition(fCTFont.get()));

    metrics->fFlags = 0;
    metrics->fFlags |= SkFontMetrics::kUnderlineThicknessIsValid_Flag;
    metrics->fFlags |= SkFontMetrics::kUnderlinePositionIsValid_Flag;

    // See https://bugs.chromium.org/p/skia/issues/detail?id=6203
    // At least on 10.12.3 with memory based fonts the x-height is always 0.6666 of the ascent and
    // the cap-height is always 0.8888 of the ascent. It appears that the values from the 'OS/2'
    // table are read, but then overwritten if the font is not a system font. As a result, if there
    // is a valid 'OS/2' table available use the values from the table if they aren't too strange.
    struct OS2HeightMetrics {
        SK_OT_SHORT sxHeight;
        SK_OT_SHORT sCapHeight;
    } heights;
    size_t bytesRead = this->getTypeface()->getTableData(
            SkTEndian_SwapBE32(SkOTTableOS2::TAG), offsetof(SkOTTableOS2, version.v2.sxHeight),
            sizeof(heights), &heights);
    if (bytesRead == sizeof(heights)) {
        // 'fontSize' is correct because the entire resolved size is set by the constructor.
        CGFloat fontSize = CTFontGetSize(this->fCTFont.get());
        unsigned upem = CTFontGetUnitsPerEm(this->fCTFont.get());
        unsigned maxSaneHeight = upem * 2;
        uint16_t xHeight = SkEndian_SwapBE16(heights.sxHeight);
        if (xHeight && xHeight < maxSaneHeight) {
            metrics->fXHeight = CGToScalar(xHeight * fontSize / upem);
        }
        uint16_t capHeight = SkEndian_SwapBE16(heights.sCapHeight);
        if (capHeight && capHeight < maxSaneHeight) {
            metrics->fCapHeight = CGToScalar(capHeight * fontSize / upem);
        }
    }
}

void SkScalerContext_Mac::CTPathElement(void *info, const CGPathElement *element) {
    SkPath* skPath = (SkPath*)info;

    // Process the path element
    switch (element->type) {
        case kCGPathElementMoveToPoint:
            skPath->moveTo(element->points[0].x, -element->points[0].y);
            break;

        case kCGPathElementAddLineToPoint:
            skPath->lineTo(element->points[0].x, -element->points[0].y);
            break;

        case kCGPathElementAddQuadCurveToPoint:
            skPath->quadTo(element->points[0].x, -element->points[0].y,
                           element->points[1].x, -element->points[1].y);
            break;

        case kCGPathElementAddCurveToPoint:
            skPath->cubicTo(element->points[0].x, -element->points[0].y,
                            element->points[1].x, -element->points[1].y,
                            element->points[2].x, -element->points[2].y);
            break;

        case kCGPathElementCloseSubpath:
            skPath->close();
            break;

        default:
            SkDEBUGFAIL("Unknown path element!");
            break;
        }
}


///////////////////////////////////////////////////////////////////////////////

// Web fonts added to the CTFont registry do not return their character set.
// Iterate through the font in this case. The existing caller caches the result,
// so the performance impact isn't too bad.
static void populate_glyph_to_unicode_slow(CTFontRef ctFont, CFIndex glyphCount,
                                           SkUnichar* out) {
    sk_bzero(out, glyphCount * sizeof(SkUnichar));
    UniChar unichar = 0;
    while (glyphCount > 0) {
        CGGlyph glyph;
        if (CTFontGetGlyphsForCharacters(ctFont, &unichar, &glyph, 1)) {
            if (out[glyph] == 0) {
                out[glyph] = unichar;
                --glyphCount;
            }
        }
        if (++unichar == 0) {
            break;
        }
    }
}

static constexpr uint16_t kPlaneSize = 1 << 13;

static void get_plane_glyph_map(const uint8_t* bits,
                                CTFontRef ctFont,
                                CFIndex glyphCount,
                                SkUnichar* glyphToUnicode,
                                uint8_t planeIndex) {
    SkUnichar planeOrigin = (SkUnichar)planeIndex << 16; // top half of codepoint.
    for (uint16_t i = 0; i < kPlaneSize; i++) {
        uint8_t mask = bits[i];
        if (!mask) {
            continue;
        }
        for (uint8_t j = 0; j < 8; j++) {
            if (0 == (mask & ((uint8_t)1 << j))) {
                continue;
            }
            uint16_t planeOffset = (i << 3) | j;
            SkUnichar codepoint = planeOrigin | (SkUnichar)planeOffset;
            uint16_t utf16[2] = {planeOffset, 0};
            size_t count = 1;
            if (planeOrigin != 0) {
                count = SkUTF::ToUTF16(codepoint, utf16);
            }
            CGGlyph glyphs[2] = {0, 0};
            if (CTFontGetGlyphsForCharacters(ctFont, utf16, glyphs, count)) {
                SkASSERT(glyphs[1] == 0);
                SkASSERT(glyphs[0] < glyphCount);
                // CTFontCopyCharacterSet and CTFontGetGlyphsForCharacters seem to add 'support'
                // for characters 0x9, 0xA, and 0xD mapping them to the glyph for character 0x20?
                // Prefer mappings to codepoints at or above 0x20.
                if (glyphToUnicode[glyphs[0]] < 0x20) {
                    glyphToUnicode[glyphs[0]] = codepoint;
                }
            }
        }
    }
}
// Construct Glyph to Unicode table.
static void populate_glyph_to_unicode(CTFontRef ctFont, CFIndex glyphCount,
                                      SkUnichar* glyphToUnicode) {
    sk_bzero(glyphToUnicode, sizeof(SkUnichar) * glyphCount);
    SkUniqueCFRef<CFCharacterSetRef> charSet(CTFontCopyCharacterSet(ctFont));
    if (!charSet) {
        populate_glyph_to_unicode_slow(ctFont, glyphCount, glyphToUnicode);
        return;
    }

    SkUniqueCFRef<CFDataRef> bitmap(
            CFCharacterSetCreateBitmapRepresentation(nullptr, charSet.get()));
    if (!bitmap) {
        return;
    }
    CFIndex dataLength = CFDataGetLength(bitmap.get());
    if (!dataLength) {
        return;
    }
    SkASSERT(dataLength >= kPlaneSize);
    const UInt8* bits = CFDataGetBytePtr(bitmap.get());

    get_plane_glyph_map(bits, ctFont, glyphCount, glyphToUnicode, 0);
    /*
    A CFData object that specifies the bitmap representation of the Unicode
    character points the for the new character set. The bitmap representation could
    contain all the Unicode character range starting from BMP to Plane 16. The
    first 8KiB (8192 bytes) of the data represent the BMP range. The BMP range 8KiB
    can be followed by zero to sixteen 8KiB bitmaps, each prepended with the plane
    index byte. For example, the bitmap representing the BMP and Plane 2 has the
    size of 16385 bytes (8KiB for BMP, 1 byte index, and a 8KiB bitmap for Plane
    2). The plane index byte, in this case, contains the integer value two.
    */

    if (dataLength <= kPlaneSize) {
        return;
    }
    int extraPlaneCount = (dataLength - kPlaneSize) / (1 + kPlaneSize);
    SkASSERT(dataLength == kPlaneSize + extraPlaneCount * (1 + kPlaneSize));
    while (extraPlaneCount-- > 0) {
        bits += kPlaneSize;
        uint8_t planeIndex = *bits++;
        SkASSERT(planeIndex >= 1);
        SkASSERT(planeIndex <= 16);
        get_plane_glyph_map(bits, ctFont, glyphCount, glyphToUnicode, planeIndex);
    }
}

/** Assumes src and dst are not nullptr. */
static void CFStringToSkString(CFStringRef src, SkString* dst) {
    // Reserve enough room for the worst-case string,
    // plus 1 byte for the trailing null.
    CFIndex length = CFStringGetMaximumSizeForEncoding(CFStringGetLength(src),
                                                       kCFStringEncodingUTF8) + 1;
    dst->resize(length);
    CFStringGetCString(src, dst->writable_str(), length, kCFStringEncodingUTF8);
    // Resize to the actual UTF-8 length used, stripping the null character.
    dst->resize(strlen(dst->c_str()));
}

void SkTypeface_Mac::getGlyphToUnicodeMap(SkUnichar* dstArray) const {
    SkUniqueCFRef<CTFontRef> ctFont =
            ctfont_create_exact_copy(fFontRef.get(), CTFontGetUnitsPerEm(fFontRef.get()),
                                     fOpszVariation);
    CFIndex glyphCount = CTFontGetGlyphCount(ctFont.get());
    populate_glyph_to_unicode(ctFont.get(), glyphCount, dstArray);
}

std::unique_ptr<SkAdvancedTypefaceMetrics> SkTypeface_Mac::onGetAdvancedMetrics() const {

    SkUniqueCFRef<CTFontRef> ctFont =
            ctfont_create_exact_copy(fFontRef.get(), CTFontGetUnitsPerEm(fFontRef.get()),
                                     fOpszVariation);

    std::unique_ptr<SkAdvancedTypefaceMetrics> info(new SkAdvancedTypefaceMetrics);

    {
        SkUniqueCFRef<CFStringRef> fontName(CTFontCopyPostScriptName(ctFont.get()));
        if (fontName.get()) {
            CFStringToSkString(fontName.get(), &info->fPostScriptName);
            info->fFontName = info->fPostScriptName;
        }
    }

    // In 10.10 and earlier, CTFontCopyVariationAxes and CTFontCopyVariation do not work when
    // applied to fonts which started life with CGFontCreateWithDataProvider (they simply always
    // return nullptr). As a result, we are limited to CGFontCopyVariationAxes and
    // CGFontCopyVariations here until support for 10.10 and earlier is removed.
    SkUniqueCFRef<CGFontRef> cgFont(CTFontCopyGraphicsFont(ctFont.get(), nullptr));
    if (cgFont) {
        SkUniqueCFRef<CFArrayRef> cgAxes(CGFontCopyVariationAxes(cgFont.get()));
        if (cgAxes && CFArrayGetCount(cgAxes.get()) > 0) {
            info->fFlags |= SkAdvancedTypefaceMetrics::kMultiMaster_FontFlag;
        }
    }

    SkOTTableOS2_V4::Type fsType;
    if (sizeof(fsType) == this->getTableData(SkTEndian_SwapBE32(SkOTTableOS2::TAG),
                                             offsetof(SkOTTableOS2_V4, fsType),
                                             sizeof(fsType),
                                             &fsType)) {
        SkOTUtils::SetAdvancedTypefaceFlags(fsType, info.get());
    }

    // If it's not a truetype font, mark it as 'other'. Assume that TrueType
    // fonts always have both glyf and loca tables. At the least, this is what
    // sfntly needs to subset the font. CTFontCopyAttribute() does not always
    // succeed in determining this directly.
    if (!this->getTableSize('glyf') || !this->getTableSize('loca')) {
        return info;
    }

    info->fType = SkAdvancedTypefaceMetrics::kTrueType_Font;
    CTFontSymbolicTraits symbolicTraits = CTFontGetSymbolicTraits(ctFont.get());
    if (symbolicTraits & kCTFontMonoSpaceTrait) {
        info->fStyle |= SkAdvancedTypefaceMetrics::kFixedPitch_Style;
    }
    if (symbolicTraits & kCTFontItalicTrait) {
        info->fStyle |= SkAdvancedTypefaceMetrics::kItalic_Style;
    }
    CTFontStylisticClass stylisticClass = symbolicTraits & kCTFontClassMaskTrait;
    if (stylisticClass >= kCTFontOldStyleSerifsClass && stylisticClass <= kCTFontSlabSerifsClass) {
        info->fStyle |= SkAdvancedTypefaceMetrics::kSerif_Style;
    } else if (stylisticClass & kCTFontScriptsClass) {
        info->fStyle |= SkAdvancedTypefaceMetrics::kScript_Style;
    }
    info->fItalicAngle = (int16_t) CTFontGetSlantAngle(ctFont.get());
    info->fAscent = (int16_t) CTFontGetAscent(ctFont.get());
    info->fDescent = (int16_t) CTFontGetDescent(ctFont.get());
    info->fCapHeight = (int16_t) CTFontGetCapHeight(ctFont.get());
    CGRect bbox = CTFontGetBoundingBox(ctFont.get());

    SkRect r;
    r.setLTRB(CGToScalar(CGRectGetMinX_inline(bbox)),   // Left
              CGToScalar(CGRectGetMaxY_inline(bbox)),   // Top
              CGToScalar(CGRectGetMaxX_inline(bbox)),   // Right
              CGToScalar(CGRectGetMinY_inline(bbox)));  // Bottom

    r.roundOut(&(info->fBBox));

    // Figure out a good guess for StemV - Min width of i, I, !, 1.
    // This probably isn't very good with an italic font.
    int16_t min_width = SHRT_MAX;
    info->fStemV = 0;
    static const UniChar stem_chars[] = {'i', 'I', '!', '1'};
    const size_t count = sizeof(stem_chars) / sizeof(stem_chars[0]);
    CGGlyph glyphs[count];
    CGRect boundingRects[count];
    if (CTFontGetGlyphsForCharacters(ctFont.get(), stem_chars, glyphs, count)) {
        CTFontGetBoundingRectsForGlyphs(ctFont.get(), kCTFontOrientationHorizontal,
                                        glyphs, boundingRects, count);
        for (size_t i = 0; i < count; i++) {
            int16_t width = (int16_t) boundingRects[i].size.width;
            if (width > 0 && width < min_width) {
                min_width = width;
                info->fStemV = min_width;
            }
        }
    }
    return info;
}

///////////////////////////////////////////////////////////////////////////////

static SK_SFNT_ULONG get_font_type_tag(CTFontRef ctFont) {
    SkUniqueCFRef<CFNumberRef> fontFormatRef(
            static_cast<CFNumberRef>(CTFontCopyAttribute(ctFont, kCTFontFormatAttribute)));
    if (!fontFormatRef) {
        return 0;
    }

    SInt32 fontFormatValue;
    if (!CFNumberGetValue(fontFormatRef.get(), kCFNumberSInt32Type, &fontFormatValue)) {
        return 0;
    }

    switch (fontFormatValue) {
        case kCTFontFormatOpenTypePostScript:
            return SkSFNTHeader::fontType_OpenTypeCFF::TAG;
        case kCTFontFormatOpenTypeTrueType:
            return SkSFNTHeader::fontType_WindowsTrueType::TAG;
        case kCTFontFormatTrueType:
            return SkSFNTHeader::fontType_MacTrueType::TAG;
        case kCTFontFormatPostScript:
            return SkSFNTHeader::fontType_PostScript::TAG;
        case kCTFontFormatBitmap:
            return SkSFNTHeader::fontType_MacTrueType::TAG;
        case kCTFontFormatUnrecognized:
        default:
            return 0;
    }
}

std::unique_ptr<SkStreamAsset> SkTypeface_Mac::onOpenStream(int* ttcIndex) const {
    *ttcIndex = 0;

    fInitStream([this]{
    if (fStream) {
        return;
    }

    SK_SFNT_ULONG fontType = get_font_type_tag(fFontRef.get());

    // get table tags
    int numTables = this->countTables();
    SkTDArray<SkFontTableTag> tableTags;
    tableTags.setCount(numTables);
    this->getTableTags(tableTags.begin());

    // CT seems to be unreliable in being able to obtain the type,
    // even if all we want is the first four bytes of the font resource.
    // Just the presence of the FontForge 'FFTM' table seems to throw it off.
    if (fontType == 0) {
        fontType = SkSFNTHeader::fontType_WindowsTrueType::TAG;

        // see https://skbug.com/7630#c7
        bool couldBeCFF = false;
        constexpr SkFontTableTag CFFTag = SkSetFourByteTag('C', 'F', 'F', ' ');
        constexpr SkFontTableTag CFF2Tag = SkSetFourByteTag('C', 'F', 'F', '2');
        for (int tableIndex = 0; tableIndex < numTables; ++tableIndex) {
            if (CFFTag == tableTags[tableIndex] || CFF2Tag == tableTags[tableIndex]) {
                couldBeCFF = true;
            }
        }
        if (couldBeCFF) {
            fontType = SkSFNTHeader::fontType_OpenTypeCFF::TAG;
        }
    }

    // Sometimes CoreGraphics incorrectly thinks a font is kCTFontFormatPostScript.
    // It is exceedingly unlikely that this is the case, so double check
    // (see https://crbug.com/809763 ).
    if (fontType == SkSFNTHeader::fontType_PostScript::TAG) {
        // see if there are any required 'typ1' tables (see Adobe Technical Note #5180)
        bool couldBeTyp1 = false;
        constexpr SkFontTableTag TYPE1Tag = SkSetFourByteTag('T', 'Y', 'P', '1');
        constexpr SkFontTableTag CIDTag = SkSetFourByteTag('C', 'I', 'D', ' ');
        for (int tableIndex = 0; tableIndex < numTables; ++tableIndex) {
            if (TYPE1Tag == tableTags[tableIndex] || CIDTag == tableTags[tableIndex]) {
                couldBeTyp1 = true;
            }
        }
        if (!couldBeTyp1) {
            fontType = SkSFNTHeader::fontType_OpenTypeCFF::TAG;
        }
    }

    // get the table sizes and accumulate the total size of the font
    SkTDArray<size_t> tableSizes;
    size_t totalSize = sizeof(SkSFNTHeader) + sizeof(SkSFNTHeader::TableDirectoryEntry) * numTables;
    for (int tableIndex = 0; tableIndex < numTables; ++tableIndex) {
        size_t tableSize = this->getTableSize(tableTags[tableIndex]);
        totalSize += (tableSize + 3) & ~3;
        *tableSizes.append() = tableSize;
    }

    // reserve memory for stream, and zero it (tables must be zero padded)
    fStream.reset(new SkMemoryStream(totalSize));
    char* dataStart = (char*)fStream->getMemoryBase();
    sk_bzero(dataStart, totalSize);
    char* dataPtr = dataStart;

    // compute font header entries
    uint16_t entrySelector = 0;
    uint16_t searchRange = 1;
    while (searchRange < numTables >> 1) {
        entrySelector++;
        searchRange <<= 1;
    }
    searchRange <<= 4;
    uint16_t rangeShift = (numTables << 4) - searchRange;

    // write font header
    SkSFNTHeader* header = (SkSFNTHeader*)dataPtr;
    header->fontType = fontType;
    header->numTables = SkEndian_SwapBE16(numTables);
    header->searchRange = SkEndian_SwapBE16(searchRange);
    header->entrySelector = SkEndian_SwapBE16(entrySelector);
    header->rangeShift = SkEndian_SwapBE16(rangeShift);
    dataPtr += sizeof(SkSFNTHeader);

    // write tables
    SkSFNTHeader::TableDirectoryEntry* entry = (SkSFNTHeader::TableDirectoryEntry*)dataPtr;
    dataPtr += sizeof(SkSFNTHeader::TableDirectoryEntry) * numTables;
    for (int tableIndex = 0; tableIndex < numTables; ++tableIndex) {
        size_t tableSize = tableSizes[tableIndex];
        this->getTableData(tableTags[tableIndex], 0, tableSize, dataPtr);
        entry->tag = SkEndian_SwapBE32(tableTags[tableIndex]);
        entry->checksum = SkEndian_SwapBE32(SkOTUtils::CalcTableChecksum((SK_OT_ULONG*)dataPtr,
                                                                         tableSize));
        entry->offset = SkEndian_SwapBE32(SkToU32(dataPtr - dataStart));
        entry->logicalLength = SkEndian_SwapBE32(SkToU32(tableSize));

        dataPtr += (tableSize + 3) & ~3;
        ++entry;
    }
    });
    return fStream->duplicate();
}

struct NonDefaultAxesContext {
    SkFixed* axisValue;
    CFArrayRef cgAxes;
};
static void set_non_default_axes(CFTypeRef key, CFTypeRef value, void* context) {
    NonDefaultAxesContext* self = static_cast<NonDefaultAxesContext*>(context);

    if (CFGetTypeID(key) != CFStringGetTypeID() || CFGetTypeID(value) != CFNumberGetTypeID()) {
        return;
    }

    // The key is a CFString which is a string from the 'name' table.
    // Search the cgAxes for an axis with this name, and use its index to store the value.
    CFIndex keyIndex = -1;
    CFStringRef keyString = static_cast<CFStringRef>(key);
    for (CFIndex i = 0; i < CFArrayGetCount(self->cgAxes); ++i) {
        CFTypeRef cgAxis = CFArrayGetValueAtIndex(self->cgAxes, i);
        if (CFGetTypeID(cgAxis) != CFDictionaryGetTypeID()) {
            continue;
        }

        CFDictionaryRef cgAxisDict = static_cast<CFDictionaryRef>(cgAxis);
        CFTypeRef cgAxisName = CFDictionaryGetValue(cgAxisDict, kCGFontVariationAxisName);
        if (!cgAxisName || CFGetTypeID(cgAxisName) != CFStringGetTypeID()) {
            continue;
        }
        CFStringRef cgAxisNameString = static_cast<CFStringRef>(cgAxisName);
        if (CFStringCompare(keyString, cgAxisNameString, 0) == kCFCompareEqualTo) {
            keyIndex = i;
            break;
        }
    }
    if (keyIndex == -1) {
        return;
    }

    CFNumberRef valueNumber = static_cast<CFNumberRef>(value);
    double valueDouble;
    if (!CFNumberGetValue(valueNumber, kCFNumberDoubleType, &valueDouble) ||
        valueDouble < SkFixedToDouble(SK_FixedMin) || SkFixedToDouble(SK_FixedMax) < valueDouble)
    {
        return;
    }
    self->axisValue[keyIndex] = SkDoubleToFixed(valueDouble);
}
static bool get_variations(CTFontRef ctFont, CFIndex* cgAxisCount,
                           SkAutoSTMalloc<4, SkFixed>* axisValues)
{
    // In 10.10 and earlier, CTFontCopyVariationAxes and CTFontCopyVariation do not work when
    // applied to fonts which started life with CGFontCreateWithDataProvider (they simply always
    // return nullptr). As a result, we are limited to CGFontCopyVariationAxes and
    // CGFontCopyVariations here until support for 10.10 and earlier is removed.
    SkUniqueCFRef<CGFontRef> cgFont(CTFontCopyGraphicsFont(ctFont, nullptr));
    if (!cgFont) {
        return false;
    }

    SkUniqueCFRef<CFDictionaryRef> cgVariations(CGFontCopyVariations(cgFont.get()));
    // If a font has no variations CGFontCopyVariations returns nullptr (instead of an empty dict).
    if (!cgVariations) {
        return false;
    }

    SkUniqueCFRef<CFArrayRef> cgAxes(CGFontCopyVariationAxes(cgFont.get()));
    if (!cgAxes) {
        return false;
    }
    *cgAxisCount = CFArrayGetCount(cgAxes.get());
    axisValues->reset(*cgAxisCount);

    // Set all of the axes to their default values.
    // Fail if any default value cannot be determined.
    for (CFIndex i = 0; i < *cgAxisCount; ++i) {
        CFTypeRef cgAxis = CFArrayGetValueAtIndex(cgAxes.get(), i);
        if (CFGetTypeID(cgAxis) != CFDictionaryGetTypeID()) {
            return false;
        }

        CFDictionaryRef cgAxisDict = static_cast<CFDictionaryRef>(cgAxis);
        CFTypeRef axisDefaultValue = CFDictionaryGetValue(cgAxisDict,
                                                          kCGFontVariationAxisDefaultValue);
        if (!axisDefaultValue || CFGetTypeID(axisDefaultValue) != CFNumberGetTypeID()) {
            return false;
        }
        CFNumberRef axisDefaultValueNumber = static_cast<CFNumberRef>(axisDefaultValue);
        double axisDefaultValueDouble;
        if (!CFNumberGetValue(axisDefaultValueNumber, kCFNumberDoubleType, &axisDefaultValueDouble))
        {
            return false;
        }
        if (axisDefaultValueDouble < SkFixedToDouble(SK_FixedMin) ||
                                     SkFixedToDouble(SK_FixedMax) < axisDefaultValueDouble)
        {
            return false;
        }
        (*axisValues)[(int)i] = SkDoubleToFixed(axisDefaultValueDouble);
    }

    // Override the default values with the given font's stated axis values.
    NonDefaultAxesContext c = { axisValues->get(), cgAxes.get() };
    CFDictionaryApplyFunction(cgVariations.get(), set_non_default_axes, &c);

    return true;
}
std::unique_ptr<SkFontData> SkTypeface_Mac::onMakeFontData() const {
    int index;
    std::unique_ptr<SkStreamAsset> stream(this->onOpenStream(&index));

    CFIndex cgAxisCount;
    SkAutoSTMalloc<4, SkFixed> axisValues;
    if (get_variations(fFontRef.get(), &cgAxisCount, &axisValues)) {
        return skstd::make_unique<SkFontData>(std::move(stream), index,
                                              axisValues.get(), cgAxisCount);
    }
    return skstd::make_unique<SkFontData>(std::move(stream), index, nullptr, 0);
}

/** Creates a CT variation dictionary {tag, value} from a CG variation dictionary {name, value}. */
static SkUniqueCFRef<CFDictionaryRef> ct_variation_from_cg_variation(CFDictionaryRef cgVariations,
                                                                     CFArrayRef ctAxes) {

    SkUniqueCFRef<CFMutableDictionaryRef> ctVariation(
            CFDictionaryCreateMutable(kCFAllocatorDefault, 0,
                                      &kCFTypeDictionaryKeyCallBacks,
                                      &kCFTypeDictionaryValueCallBacks));

    CFIndex axisCount = CFArrayGetCount(ctAxes);
    for (CFIndex i = 0; i < axisCount; ++i) {
        CFTypeRef axisInfo = CFArrayGetValueAtIndex(ctAxes, i);
        if (CFDictionaryGetTypeID() != CFGetTypeID(axisInfo)) {
            return nullptr;
        }
        CFDictionaryRef axisInfoDict = static_cast<CFDictionaryRef>(axisInfo);

        // The assumption is that values produced by kCTFontVariationAxisNameKey and
        // kCGFontVariationAxisName will always be equal.
        CFTypeRef axisName = CFDictionaryGetValue(axisInfoDict, kCTFontVariationAxisNameKey);
        if (!axisName || CFGetTypeID(axisName) != CFStringGetTypeID()) {
            return nullptr;
        }

        CFTypeRef axisValue = CFDictionaryGetValue(cgVariations, axisName);
        if (!axisValue || CFGetTypeID(axisValue) != CFNumberGetTypeID()) {
            return nullptr;
        }

        CFTypeRef axisTag = CFDictionaryGetValue(axisInfoDict, kCTFontVariationAxisIdentifierKey);
        if (!axisTag || CFGetTypeID(axisTag) != CFNumberGetTypeID()) {
            return nullptr;
        }

        CFDictionaryAddValue(ctVariation.get(), axisTag, axisValue);
    }
    return ctVariation;
}

int SkTypeface_Mac::onGetVariationDesignPosition(
        SkFontArguments::VariationPosition::Coordinate coordinates[], int coordinateCount) const
{
    // The CGFont variation data does not contain the tag.

    // CTFontCopyVariationAxes returns nullptr for CGFontCreateWithDataProvider fonts with
    // macOS 10.10 and iOS 9 or earlier. When this happens, there is no API to provide the tag.
    SkUniqueCFRef<CFArrayRef> ctAxes(CTFontCopyVariationAxes(fFontRef.get()));
    if (!ctAxes) {
        return -1;
    }
    CFIndex axisCount = CFArrayGetCount(ctAxes.get());
    if (!coordinates || coordinateCount < axisCount) {
        return axisCount;
    }

    // This call always returns nullptr on 10.11 and under for CGFontCreateWithDataProvider fonts.
    // When this happens, try converting the CG variation to a CT variation.
    // On 10.12 and later, this only returns non-default variations.
    SkUniqueCFRef<CFDictionaryRef> ctVariation(CTFontCopyVariation(fFontRef.get()));
    if (!ctVariation) {
        // When 10.11 and earlier are no longer supported, the following code can be replaced with
        // return -1 and ct_variation_from_cg_variation can be removed.
        SkUniqueCFRef<CGFontRef> cgFont(CTFontCopyGraphicsFont(fFontRef.get(), nullptr));
        if (!cgFont) {
            return -1;
        }
        SkUniqueCFRef<CFDictionaryRef> cgVariations(CGFontCopyVariations(cgFont.get()));
        if (!cgVariations) {
            return -1;
        }
        ctVariation = ct_variation_from_cg_variation(cgVariations.get(), ctAxes.get());
        if (!ctVariation) {
            return -1;
        }
    }

    for (int i = 0; i < axisCount; ++i) {
        CFTypeRef axisInfo = CFArrayGetValueAtIndex(ctAxes.get(), i);
        if (CFDictionaryGetTypeID() != CFGetTypeID(axisInfo)) {
            return -1;
        }
        CFDictionaryRef axisInfoDict = static_cast<CFDictionaryRef>(axisInfo);

        CFTypeRef tag = CFDictionaryGetValue(axisInfoDict, kCTFontVariationAxisIdentifierKey);
        if (!tag || CFGetTypeID(tag) != CFNumberGetTypeID()) {
            return -1;
        }
        CFNumberRef tagNumber = static_cast<CFNumberRef>(tag);
        int64_t tagLong;
        if (!CFNumberGetValue(tagNumber, kCFNumberSInt64Type, &tagLong)) {
            return -1;
        }
        coordinates[i].axis = tagLong;

        CGFloat variationCGFloat;
        CFTypeRef variationValue = CFDictionaryGetValue(ctVariation.get(), tagNumber);
        if (variationValue) {
            if (CFGetTypeID(variationValue) != CFNumberGetTypeID()) {
                return -1;
            }
            CFNumberRef variationNumber = static_cast<CFNumberRef>(variationValue);
            if (!CFNumberGetValue(variationNumber, kCFNumberCGFloatType, &variationCGFloat)) {
                return -1;
            }
        } else {
            CFTypeRef def = CFDictionaryGetValue(axisInfoDict, kCTFontVariationAxisDefaultValueKey);
            if (!def || CFGetTypeID(def) != CFNumberGetTypeID()) {
                return -1;
            }
            CFNumberRef defNumber = static_cast<CFNumberRef>(def);
            if (!CFNumberGetValue(defNumber, kCFNumberCGFloatType, &variationCGFloat)) {
                return -1;
            }
        }
        coordinates[i].value = CGToScalar(variationCGFloat);

    }
    return axisCount;
}

///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////

int SkTypeface_Mac::onGetUPEM() const {
    SkUniqueCFRef<CGFontRef> cgFont(CTFontCopyGraphicsFont(fFontRef.get(), nullptr));
    return CGFontGetUnitsPerEm(cgFont.get());
}

SkTypeface::LocalizedStrings* SkTypeface_Mac::onCreateFamilyNameIterator() const {
    sk_sp<SkTypeface::LocalizedStrings> nameIter =
            SkOTUtils::LocalizedStrings_NameTable::MakeForFamilyNames(*this);
    if (!nameIter) {
        CFStringRef cfLanguageRaw;
        SkUniqueCFRef<CFStringRef> cfFamilyName(
                CTFontCopyLocalizedName(fFontRef.get(), kCTFontFamilyNameKey, &cfLanguageRaw));
        SkUniqueCFRef<CFStringRef> cfLanguage(cfLanguageRaw);

        SkString skLanguage;
        SkString skFamilyName;
        if (cfLanguage) {
            CFStringToSkString(cfLanguage.get(), &skLanguage);
        } else {
            skLanguage = "und"; //undetermined
        }
        if (cfFamilyName) {
            CFStringToSkString(cfFamilyName.get(), &skFamilyName);
        }

        nameIter = sk_make_sp<SkOTUtils::LocalizedStrings_SingleName>(skFamilyName, skLanguage);
    }
    return nameIter.release();
}

int SkTypeface_Mac::onGetTableTags(SkFontTableTag tags[]) const {
    SkUniqueCFRef<CFArrayRef> cfArray(
            CTFontCopyAvailableTables(fFontRef.get(), kCTFontTableOptionNoOptions));
    if (!cfArray) {
        return 0;
    }
    int count = SkToInt(CFArrayGetCount(cfArray.get()));
    if (tags) {
        for (int i = 0; i < count; ++i) {
            uintptr_t fontTag = reinterpret_cast<uintptr_t>(
                CFArrayGetValueAtIndex(cfArray.get(), i));
            tags[i] = static_cast<SkFontTableTag>(fontTag);
        }
    }
    return count;
}

// If, as is the case with web fonts, the CTFont data isn't available,
// the CGFont data may work. While the CGFont may always provide the
// right result, leave the CTFont code path to minimize disruption.
static SkUniqueCFRef<CFDataRef> copy_table_from_font(CTFontRef ctFont, SkFontTableTag tag) {
    SkUniqueCFRef<CFDataRef> data(CTFontCopyTable(ctFont, (CTFontTableTag) tag,
                                                  kCTFontTableOptionNoOptions));
    if (!data) {
        SkUniqueCFRef<CGFontRef> cgFont(CTFontCopyGraphicsFont(ctFont, nullptr));
        data.reset(CGFontCopyTableForTag(cgFont.get(), tag));
    }
    return data;
}

size_t SkTypeface_Mac::onGetTableData(SkFontTableTag tag, size_t offset,
                                      size_t length, void* dstData) const {
    SkUniqueCFRef<CFDataRef> srcData = copy_table_from_font(fFontRef.get(), tag);
    if (!srcData) {
        return 0;
    }

    size_t srcSize = CFDataGetLength(srcData.get());
    if (offset >= srcSize) {
        return 0;
    }
    if (length > srcSize - offset) {
        length = srcSize - offset;
    }
    if (dstData) {
        memcpy(dstData, CFDataGetBytePtr(srcData.get()) + offset, length);
    }
    return length;
}

sk_sp<SkData> SkTypeface_Mac::onCopyTableData(SkFontTableTag tag) const {
    SkUniqueCFRef<CFDataRef> srcData = copy_table_from_font(fFontRef.get(), tag);
    if (!srcData) {
        return nullptr;
    }
    const UInt8* data = CFDataGetBytePtr(srcData.get());
    CFIndex length = CFDataGetLength(srcData.get());
    return SkData::MakeWithProc(data, length,
                                [](const void*, void* ctx) {
                                    CFRelease((CFDataRef)ctx);
                                }, (void*)srcData.release());
}

SkScalerContext* SkTypeface_Mac::onCreateScalerContext(const SkScalerContextEffects& effects,
                                                       const SkDescriptor* desc) const {
    return new SkScalerContext_Mac(sk_ref_sp(const_cast<SkTypeface_Mac*>(this)), effects, desc);
}

void SkTypeface_Mac::onFilterRec(SkScalerContextRec* rec) const {
    if (rec->fFlags & SkScalerContext::kLCD_BGROrder_Flag ||
        rec->fFlags & SkScalerContext::kLCD_Vertical_Flag)
    {
        rec->fMaskFormat = SkMask::kA8_Format;
        // Render the glyphs as close as possible to what was requested.
        // The above turns off subpixel rendering, but the user requested it.
        // Normal hinting will cause the A8 masks to be generated from CoreGraphics subpixel masks.
        // See comments below for more details.
        rec->setHinting(SkFontHinting::kNormal);
    }

    unsigned flagsWeDontSupport = SkScalerContext::kForceAutohinting_Flag  |
                                  SkScalerContext::kLCD_BGROrder_Flag |
                                  SkScalerContext::kLCD_Vertical_Flag;

    rec->fFlags &= ~flagsWeDontSupport;

    const SmoothBehavior smoothBehavior = smooth_behavior();

    // Only two levels of hinting are supported.
    // kNo_Hinting means avoid CoreGraphics outline dilation (smoothing).
    // kNormal_Hinting means CoreGraphics outline dilation (smoothing) is allowed.
    if (rec->getHinting() != SkFontHinting::kNone) {
        rec->setHinting(SkFontHinting::kNormal);
    }
    // If smoothing has no effect, don't request it.
    if (smoothBehavior == SmoothBehavior::none) {
        rec->setHinting(SkFontHinting::kNone);
    }

    // FIXME: lcd smoothed un-hinted rasterization unsupported.
    // Tracked by http://code.google.com/p/skia/issues/detail?id=915 .
    // There is no current means to honor a request for unhinted lcd,
    // so arbitrarilly ignore the hinting request and honor lcd.

    // Hinting and smoothing should be orthogonal, but currently they are not.
    // CoreGraphics has no API to influence hinting. However, its lcd smoothed
    // output is drawn from auto-dilated outlines (the amount of which is
    // determined by AppleFontSmoothing). Its regular anti-aliased output is
    // drawn from un-dilated outlines.

    // The behavior of Skia is as follows:
    // [AA][no-hint]: generate AA using CoreGraphic's AA output.
    // [AA][yes-hint]: use CoreGraphic's LCD output and reduce it to a single
    // channel. This matches [LCD][yes-hint] in weight.
    // [LCD][no-hint]: curently unable to honor, and must pick which to respect.
    // Currenly side with LCD, effectively ignoring the hinting setting.
    // [LCD][yes-hint]: generate LCD using CoreGraphic's LCD output.
    if (rec->fMaskFormat == SkMask::kLCD16_Format) {
        if (smoothBehavior == SmoothBehavior::subpixel) {
            //CoreGraphics creates 555 masks for smoothed text anyway.
            rec->fMaskFormat = SkMask::kLCD16_Format;
            rec->setHinting(SkFontHinting::kNormal);
        } else {
            rec->fMaskFormat = SkMask::kA8_Format;
            if (smoothBehavior != SmoothBehavior::none) {
                rec->setHinting(SkFontHinting::kNormal);
            }
        }
    }

    // CoreText provides no information as to whether a glyph will be color or not.
    // Fonts may mix outlines and bitmaps, so information is needed on a glyph by glyph basis.
    // If a font contains an 'sbix' table, consider it to be a color font, and disable lcd.
    if (fHasColorGlyphs) {
        rec->fMaskFormat = SkMask::kARGB32_Format;
    }

    // Unhinted A8 masks (those not derived from LCD masks) must respect SK_GAMMA_APPLY_TO_A8.
    // All other masks can use regular gamma.
    if (SkMask::kA8_Format == rec->fMaskFormat && SkFontHinting::kNone == rec->getHinting()) {
#ifndef SK_GAMMA_APPLY_TO_A8
        // SRGBTODO: Is this correct? Do we want contrast boost?
        rec->ignorePreBlend();
#endif
    } else {
        SkColor color = rec->getLuminanceColor();
        if (smoothBehavior == SmoothBehavior::some) {
            // CoreGraphics smoothed text without subpixel coverage blitting goes from a gamma of
            // 2.0 for black foreground to a gamma of 1.0 for white foreground. Emulate this
            // through the mask gamma by reducing the color values to 1/2.
            color = SkColorSetRGB(SkColorGetR(color) * 1/2,
                                  SkColorGetG(color) * 1/2,
                                  SkColorGetB(color) * 1/2);
        } else if (smoothBehavior == SmoothBehavior::subpixel) {
            // CoreGraphics smoothed text with subpixel coverage blitting goes from a gamma of
            // 2.0 for black foreground to a gamma of ~1.4? for white foreground. Emulate this
            // through the mask gamma by reducing the color values to 3/4.
            color = SkColorSetRGB(SkColorGetR(color) * 3/4,
                                  SkColorGetG(color) * 3/4,
                                  SkColorGetB(color) * 3/4);
        }
        rec->setLuminanceColor(color);

        // CoreGraphics dialates smoothed text to provide contrast.
        rec->setContrast(0);
    }
}

/** Takes ownership of the CFStringRef. */
static const char* get_str(CFStringRef ref, SkString* str) {
    if (nullptr == ref) {
        return nullptr;
    }
    CFStringToSkString(ref, str);
    CFRelease(ref);
    return str->c_str();
}

void SkTypeface_Mac::onGetFamilyName(SkString* familyName) const {
    get_str(CTFontCopyFamilyName(fFontRef.get()), familyName);
}

void SkTypeface_Mac::onGetFontDescriptor(SkFontDescriptor* desc,
                                         bool* isLocalStream) const {
    SkString tmpStr;

    desc->setFamilyName(get_str(CTFontCopyFamilyName(fFontRef.get()), &tmpStr));
    desc->setFullName(get_str(CTFontCopyFullName(fFontRef.get()), &tmpStr));
    desc->setPostscriptName(get_str(CTFontCopyPostScriptName(fFontRef.get()), &tmpStr));
    desc->setStyle(this->fontStyle());
    *isLocalStream = fIsFromStream;
}

void SkTypeface_Mac::onCharsToGlyphs(const SkUnichar uni[], int count, SkGlyphID glyphs[]) const {
    // Undocumented behavior of CTFontGetGlyphsForCharacters with non-bmp code points:
    // When a surrogate pair is detected, the glyph index used is the index of the high surrogate.
    // It is documented that if a mapping is unavailable, the glyph will be set to 0.

    SkAutoSTMalloc<1024, UniChar> charStorage;
    const UniChar* src; // UniChar is a UTF-16 16-bit code unit.
    int srcCount;
    const SkUnichar* utf32 = reinterpret_cast<const SkUnichar*>(uni);
    UniChar* utf16 = charStorage.reset(2 * count);
    src = utf16;
    for (int i = 0; i < count; ++i) {
        utf16 += SkUTF::ToUTF16(utf32[i], utf16);
    }
    srcCount = SkToInt(utf16 - src);

    // If there are any non-bmp code points, the provided 'glyphs' storage will be inadequate.
    SkAutoSTMalloc<1024, uint16_t> glyphStorage;
    uint16_t* macGlyphs = glyphs;
    if (srcCount > count) {
        macGlyphs = glyphStorage.reset(srcCount);
    }

    CTFontGetGlyphsForCharacters(fFontRef.get(), src, macGlyphs, srcCount);

    // If there were any non-bmp, then copy and compact.
    // If all are bmp, 'glyphs' already contains the compact glyphs.
    // If some are non-bmp, copy and compact into 'glyphs'.
    if (srcCount > count) {
        SkASSERT(glyphs != macGlyphs);
        int extra = 0;
        for (int i = 0; i < count; ++i) {
            glyphs[i] = macGlyphs[i + extra];
            if (SkUTF16_IsLeadingSurrogate(src[i + extra])) {
                ++extra;
            }
        }
    } else {
        SkASSERT(glyphs == macGlyphs);
    }
}

int SkTypeface_Mac::onCountGlyphs() const {
    return SkToInt(CTFontGetGlyphCount(fFontRef.get()));
}

///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////

static bool find_desc_str(CTFontDescriptorRef desc, CFStringRef name, SkString* value) {
    SkUniqueCFRef<CFStringRef> ref((CFStringRef)CTFontDescriptorCopyAttribute(desc, name));
    if (!ref) {
        return false;
    }
    CFStringToSkString(ref.get(), value);
    return true;
}

static inline int sqr(int value) {
    SkASSERT(SkAbs32(value) < 0x7FFF);  // check for overflow
    return value * value;
}

// We normalize each axis (weight, width, italic) to be base-900
static int compute_metric(const SkFontStyle& a, const SkFontStyle& b) {
    return sqr(a.weight() - b.weight()) +
           sqr((a.width() - b.width()) * 100) +
           sqr((a.slant() != b.slant()) * 900);
}

class SkFontStyleSet_Mac : public SkFontStyleSet {
public:
    SkFontStyleSet_Mac(CTFontDescriptorRef desc)
        : fArray(CTFontDescriptorCreateMatchingFontDescriptors(desc, nullptr))
        , fCount(0)
    {
        if (!fArray) {
            fArray.reset(CFArrayCreate(nullptr, nullptr, 0, nullptr));
        }
        fCount = SkToInt(CFArrayGetCount(fArray.get()));
    }

    int count() override {
        return fCount;
    }

    void getStyle(int index, SkFontStyle* style, SkString* name) override {
        SkASSERT((unsigned)index < (unsigned)fCount);
        CTFontDescriptorRef desc = (CTFontDescriptorRef)CFArrayGetValueAtIndex(fArray.get(), index);
        if (style) {
            *style = fontstyle_from_descriptor(desc, false);
        }
        if (name) {
            if (!find_desc_str(desc, kCTFontStyleNameAttribute, name)) {
                name->reset();
            }
        }
    }

    SkTypeface* createTypeface(int index) override {
        SkASSERT((unsigned)index < (unsigned)CFArrayGetCount(fArray.get()));
        CTFontDescriptorRef desc = (CTFontDescriptorRef)CFArrayGetValueAtIndex(fArray.get(), index);

        return create_from_desc(desc).release();
    }

    SkTypeface* matchStyle(const SkFontStyle& pattern) override {
        if (0 == fCount) {
            return nullptr;
        }
        return create_from_desc(findMatchingDesc(pattern)).release();
    }

private:
    SkUniqueCFRef<CFArrayRef> fArray;
    int fCount;

    CTFontDescriptorRef findMatchingDesc(const SkFontStyle& pattern) const {
        int bestMetric = SK_MaxS32;
        CTFontDescriptorRef bestDesc = nullptr;

        for (int i = 0; i < fCount; ++i) {
            CTFontDescriptorRef desc = (CTFontDescriptorRef)CFArrayGetValueAtIndex(fArray.get(), i);
            int metric = compute_metric(pattern, fontstyle_from_descriptor(desc, false));
            if (0 == metric) {
                return desc;
            }
            if (metric < bestMetric) {
                bestMetric = metric;
                bestDesc = desc;
            }
        }
        SkASSERT(bestDesc);
        return bestDesc;
    }
};

class SkFontMgr_Mac : public SkFontMgr {
    SkUniqueCFRef<CFArrayRef> fNames;
    int fCount;

    CFStringRef getFamilyNameAt(int index) const {
        SkASSERT((unsigned)index < (unsigned)fCount);
        return (CFStringRef)CFArrayGetValueAtIndex(fNames.get(), index);
    }

    static SkFontStyleSet* CreateSet(CFStringRef cfFamilyName) {
        SkUniqueCFRef<CFMutableDictionaryRef> cfAttr(
                 CFDictionaryCreateMutable(kCFAllocatorDefault, 0,
                                           &kCFTypeDictionaryKeyCallBacks,
                                           &kCFTypeDictionaryValueCallBacks));

        CFDictionaryAddValue(cfAttr.get(), kCTFontFamilyNameAttribute, cfFamilyName);

        SkUniqueCFRef<CTFontDescriptorRef> desc(
                CTFontDescriptorCreateWithAttributes(cfAttr.get()));
        return new SkFontStyleSet_Mac(desc.get());
    }

    /** CTFontManagerCopyAvailableFontFamilyNames() is not always available, so we
     *  provide a wrapper here that will return an empty array if need be.
     */
    static SkUniqueCFRef<CFArrayRef> CopyAvailableFontFamilyNames() {
#ifdef SK_BUILD_FOR_IOS
        return SkUniqueCFRef<CFArrayRef>(CFArrayCreate(nullptr, nullptr, 0, nullptr));
#else
        return SkUniqueCFRef<CFArrayRef>(CTFontManagerCopyAvailableFontFamilyNames());
#endif
    }

public:
    SkFontMgr_Mac()
        : fNames(CopyAvailableFontFamilyNames())
        , fCount(fNames ? SkToInt(CFArrayGetCount(fNames.get())) : 0) {}

protected:
    int onCountFamilies() const override {
        return fCount;
    }

    void onGetFamilyName(int index, SkString* familyName) const override {
        if ((unsigned)index < (unsigned)fCount) {
            CFStringToSkString(this->getFamilyNameAt(index), familyName);
        } else {
            familyName->reset();
        }
    }

    SkFontStyleSet* onCreateStyleSet(int index) const override {
        if ((unsigned)index >= (unsigned)fCount) {
            return nullptr;
        }
        return CreateSet(this->getFamilyNameAt(index));
    }

    SkFontStyleSet* onMatchFamily(const char familyName[]) const override {
        if (!familyName) {
            return nullptr;
        }
        SkUniqueCFRef<CFStringRef> cfName = make_CFString(familyName);
        return CreateSet(cfName.get());
    }

    SkTypeface* onMatchFamilyStyle(const char familyName[],
                                   const SkFontStyle& style) const override {
        SkUniqueCFRef<CTFontDescriptorRef> desc = create_descriptor(familyName, style);
        return create_from_desc(desc.get()).release();
    }

    SkTypeface* onMatchFamilyStyleCharacter(const char familyName[],
                                            const SkFontStyle& style,
                                            const char* bcp47[], int bcp47Count,
                                            SkUnichar character) const override {
        SkUniqueCFRef<CTFontDescriptorRef> desc = create_descriptor(familyName, style);
        SkUniqueCFRef<CTFontRef> familyFont(CTFontCreateWithFontDescriptor(desc.get(), 0, nullptr));

        // kCFStringEncodingUTF32 is BE unless there is a BOM.
        // Since there is no machine endian option, explicitly state machine endian.
#ifdef SK_CPU_LENDIAN
        constexpr CFStringEncoding encoding = kCFStringEncodingUTF32LE;
#else
        constexpr CFStringEncoding encoding = kCFStringEncodingUTF32BE;
#endif
        SkUniqueCFRef<CFStringRef> string(CFStringCreateWithBytes(
                kCFAllocatorDefault, reinterpret_cast<const UInt8 *>(&character), sizeof(character),
                encoding, false));
        CFRange range = CFRangeMake(0, CFStringGetLength(string.get()));  // in UniChar units.
        SkUniqueCFRef<CTFontRef> fallbackFont(
                CTFontCreateForString(familyFont.get(), string.get(), range));
        return create_from_CTFontRef(std::move(fallbackFont), nullptr,
                                     OpszVariation(), nullptr).release();
    }

    SkTypeface* onMatchFaceStyle(const SkTypeface* familyMember,
                                 const SkFontStyle&) const override {
        return nullptr;
    }

    sk_sp<SkTypeface> onMakeFromData(sk_sp<SkData> data, int ttcIndex) const override {
        if (ttcIndex != 0) {
            return nullptr;
        }

        SkUniqueCFRef<CTFontRef> ct = ctfont_from_skdata(data, ttcIndex);
        if (!ct) {
            return nullptr;
        }

        return create_from_CTFontRef(std::move(ct), nullptr, OpszVariation(),
                                     SkMemoryStream::Make(std::move(data)));
    }

    sk_sp<SkTypeface> onMakeFromStreamIndex(std::unique_ptr<SkStreamAsset> stream,
                                            int ttcIndex) const override {
        if (ttcIndex != 0) {
            return nullptr;
        }

        sk_sp<SkData> data = skdata_from_skstreamasset(stream->duplicate());
        if (!data) {
            return nullptr;
        }
        SkUniqueCFRef<CTFontRef> ct = ctfont_from_skdata(std::move(data), ttcIndex);
        if (!ct) {
            return nullptr;
        }

        return create_from_CTFontRef(std::move(ct), nullptr, OpszVariation(), std::move(stream));
    }

    struct CTFontVariation {
        SkUniqueCFRef<CFDictionaryRef> dict;
        OpszVariation opsz;
    };

    /** Creates a dictionary suitable for setting the axes on a CTFont. */
    static CTFontVariation ctvariation_from_skfontarguments(CTFontRef ct,
                                                            const SkFontArguments& args)
    {
        OpszVariation opsz;
        constexpr const SkFourByteTag opszTag = SkSetFourByteTag('o','p','s','z');

        SkUniqueCFRef<CFArrayRef> ctAxes(CTFontCopyVariationAxes(ct));
        if (!ctAxes) {
            return CTFontVariation();
        }
        CFIndex axisCount = CFArrayGetCount(ctAxes.get());

        const SkFontArguments::VariationPosition position = args.getVariationDesignPosition();

        SkUniqueCFRef<CFMutableDictionaryRef> dict(
                CFDictionaryCreateMutable(kCFAllocatorDefault, axisCount,
                                          &kCFTypeDictionaryKeyCallBacks,
                                          &kCFTypeDictionaryValueCallBacks));

        for (int i = 0; i < axisCount; ++i) {
            CFTypeRef axisInfo = CFArrayGetValueAtIndex(ctAxes.get(), i);
            if (CFDictionaryGetTypeID() != CFGetTypeID(axisInfo)) {
                return CTFontVariation();
            }
            CFDictionaryRef axisInfoDict = static_cast<CFDictionaryRef>(axisInfo);

            CFTypeRef tag = CFDictionaryGetValue(axisInfoDict, kCTFontVariationAxisIdentifierKey);
            if (!tag || CFGetTypeID(tag) != CFNumberGetTypeID()) {
                return CTFontVariation();
            }
            CFNumberRef tagNumber = static_cast<CFNumberRef>(tag);
            int64_t tagLong;
            if (!CFNumberGetValue(tagNumber, kCFNumberSInt64Type, &tagLong)) {
                return CTFontVariation();
            }

            // The variation axes can be set to any value, but cg will effectively pin them.
            // Pin them here to normalize.
            CFTypeRef min = CFDictionaryGetValue(axisInfoDict, kCTFontVariationAxisMinimumValueKey);
            CFTypeRef max = CFDictionaryGetValue(axisInfoDict, kCTFontVariationAxisMaximumValueKey);
            CFTypeRef def = CFDictionaryGetValue(axisInfoDict, kCTFontVariationAxisDefaultValueKey);
            if (!min || CFGetTypeID(min) != CFNumberGetTypeID() ||
                !max || CFGetTypeID(max) != CFNumberGetTypeID() ||
                !def || CFGetTypeID(def) != CFNumberGetTypeID())
            {
                return CTFontVariation();
            }
            CFNumberRef minNumber = static_cast<CFNumberRef>(min);
            CFNumberRef maxNumber = static_cast<CFNumberRef>(max);
            CFNumberRef defNumber = static_cast<CFNumberRef>(def);
            double minDouble;
            double maxDouble;
            double defDouble;
            if (!CFNumberGetValue(minNumber, kCFNumberDoubleType, &minDouble) ||
                !CFNumberGetValue(maxNumber, kCFNumberDoubleType, &maxDouble) ||
                !CFNumberGetValue(defNumber, kCFNumberDoubleType, &defDouble))
            {
                return CTFontVariation();
            }

            double value = defDouble;
            // The position may be over specified. If there are multiple values for a given axis,
            // use the last one since that's what css-fonts-4 requires.
            for (int j = position.coordinateCount; j --> 0;) {
                if (position.coordinates[j].axis == tagLong) {
                    value = SkTPin(SkScalarToDouble(position.coordinates[j].value),
                                   minDouble, maxDouble);
                    if (tagLong == opszTag) {
                        opsz.isSet = true;
                    }
                    break;
                }
            }
            if (tagLong == opszTag) {
                opsz.value = value;
            }
            SkUniqueCFRef<CFNumberRef> valueNumber(
                CFNumberCreate(kCFAllocatorDefault, kCFNumberDoubleType, &value));
            CFDictionaryAddValue(dict.get(), tagNumber, valueNumber.get());
        }
        return { SkUniqueCFRef<CFDictionaryRef>(std::move(dict)), opsz };
    }

    static sk_sp<SkData> skdata_from_skstreamasset(std::unique_ptr<SkStreamAsset> stream) {
        size_t size = stream->getLength();
        if (const void* base = stream->getMemoryBase()) {
            return SkData::MakeWithProc(base, size,
                                        [](const void*, void* ctx) -> void {
                                            delete (SkStreamAsset*)ctx;
                                        }, stream.release());
        }
        return SkData::MakeFromStream(stream.get(), size);
    }

    static SkUniqueCFRef<CFDataRef> cfdata_from_skdata(sk_sp<SkData> data) {
        void const * const addr = data->data();
        size_t const size = data->size();

        CFAllocatorContext ctx = {
            0, // CFIndex version
            data.release(), // void* info
            nullptr, // const void *(*retain)(const void *info);
            nullptr, // void (*release)(const void *info);
            nullptr, // CFStringRef (*copyDescription)(const void *info);
            nullptr, // void * (*allocate)(CFIndex size, CFOptionFlags hint, void *info);
            nullptr, // void*(*reallocate)(void* ptr,CFIndex newsize,CFOptionFlags hint,void* info);
            [](void*,void* info) -> void { // void (*deallocate)(void *ptr, void *info);
                SkASSERT(info);
                ((SkData*)info)->unref();
            },
            nullptr, // CFIndex (*preferredSize)(CFIndex size, CFOptionFlags hint, void *info);
        };
        SkUniqueCFRef<CFAllocatorRef> alloc(CFAllocatorCreate(kCFAllocatorDefault, &ctx));
        return SkUniqueCFRef<CFDataRef>(CFDataCreateWithBytesNoCopy(
                kCFAllocatorDefault, (const UInt8 *)addr, size, alloc.get()));
    }

    static SkUniqueCFRef<CTFontRef> ctfont_from_skdata(sk_sp<SkData> data, int ttcIndex) {
        // TODO: Use CTFontManagerCreateFontDescriptorsFromData when available.
        if (ttcIndex != 0) {
            return nullptr;
        }

        SkUniqueCFRef<CFDataRef> cfData(cfdata_from_skdata(std::move(data)));

        SkUniqueCFRef<CTFontDescriptorRef> desc(
                CTFontManagerCreateFontDescriptorFromData(cfData.get()));
        if (!desc) {
            return nullptr;
        }
        return SkUniqueCFRef<CTFontRef>(CTFontCreateWithFontDescriptor(desc.get(), 0, nullptr));
    }

    sk_sp<SkTypeface> onMakeFromStreamArgs(std::unique_ptr<SkStreamAsset> stream,
                                           const SkFontArguments& args) const override
    {
        // TODO: Use CTFontManagerCreateFontDescriptorsFromData when available.
        int ttcIndex = args.getCollectionIndex();
        if (ttcIndex != 0) {
            return nullptr;
        }

        sk_sp<SkData> data = skdata_from_skstreamasset(stream->duplicate());
        if (!data) {
            return nullptr;
        }
        SkUniqueCFRef<CTFontRef> ct = ctfont_from_skdata(std::move(data), ttcIndex);
        if (!ct) {
            return nullptr;
        }

        CTFontVariation ctVariation = ctvariation_from_skfontarguments(ct.get(), args);

        SkUniqueCFRef<CTFontRef> ctVariant;
        if (ctVariation.dict) {
            SkUniqueCFRef<CFMutableDictionaryRef> attributes(
                    CFDictionaryCreateMutable(kCFAllocatorDefault, 0,
                                              &kCFTypeDictionaryKeyCallBacks,
                                              &kCFTypeDictionaryValueCallBacks));
            CFDictionaryAddValue(attributes.get(),
                                 kCTFontVariationAttribute, ctVariation.dict.get());
            SkUniqueCFRef<CTFontDescriptorRef> varDesc(
                    CTFontDescriptorCreateWithAttributes(attributes.get()));
            ctVariant.reset(CTFontCreateCopyWithAttributes(ct.get(), 0, nullptr, varDesc.get()));
        } else {
            ctVariant.reset(ct.release());
        }
        if (!ctVariant) {
            return nullptr;
        }

        return create_from_CTFontRef(std::move(ctVariant), nullptr, ctVariation.opsz,
                                     std::move(stream));
    }

    /** Creates a dictionary suitable for setting the axes on a CTFont. */
    static CTFontVariation ctvariation_from_skfontdata(CTFontRef ct, SkFontData* fontData) {
        // In macOS 10.15 CTFontCreate* overrides any 'opsz' variation with the 'size'.
        // Track the 'opsz' and return it, since it is an out of band axis.
        OpszVariation opsz;
        constexpr const SkFourByteTag opszTag = SkSetFourByteTag('o','p','s','z');

        SkUniqueCFRef<CFArrayRef> ctAxes(CTFontCopyVariationAxes(ct));
        if (!ctAxes) {
            return CTFontVariation();
        }

        CFIndex axisCount = CFArrayGetCount(ctAxes.get());
        if (0 == axisCount || axisCount != fontData->getAxisCount()) {
            return CTFontVariation();
        }

        SkUniqueCFRef<CFMutableDictionaryRef> dict(
                CFDictionaryCreateMutable(kCFAllocatorDefault, axisCount,
                                          &kCFTypeDictionaryKeyCallBacks,
                                          &kCFTypeDictionaryValueCallBacks));

        for (int i = 0; i < fontData->getAxisCount(); ++i) {
            CFTypeRef axisInfo = CFArrayGetValueAtIndex(ctAxes.get(), i);
            if (CFDictionaryGetTypeID() != CFGetTypeID(axisInfo)) {
                return CTFontVariation();
            }
            CFDictionaryRef axisInfoDict = static_cast<CFDictionaryRef>(axisInfo);

            CFTypeRef tag = CFDictionaryGetValue(axisInfoDict,
                                                 kCTFontVariationAxisIdentifierKey);
            if (!tag || CFGetTypeID(tag) != CFNumberGetTypeID()) {
                return CTFontVariation();
            }
            CFNumberRef tagNumber = static_cast<CFNumberRef>(tag);
            int64_t tagLong;
            if (!CFNumberGetValue(tagNumber, kCFNumberSInt64Type, &tagLong)) {
                return CTFontVariation();
            }

            // The variation axes can be set to any value, but cg will effectively pin them.
            // Pin them here to normalize.
            CFTypeRef min = CFDictionaryGetValue(axisInfoDict, kCTFontVariationAxisMinimumValueKey);
            CFTypeRef max = CFDictionaryGetValue(axisInfoDict, kCTFontVariationAxisMaximumValueKey);
            if (!min || CFGetTypeID(min) != CFNumberGetTypeID() ||
                !max || CFGetTypeID(max) != CFNumberGetTypeID())
            {
                return CTFontVariation();
            }
            CFNumberRef minNumber = static_cast<CFNumberRef>(min);
            CFNumberRef maxNumber = static_cast<CFNumberRef>(max);
            double minDouble;
            double maxDouble;
            if (!CFNumberGetValue(minNumber, kCFNumberDoubleType, &minDouble) ||
                !CFNumberGetValue(maxNumber, kCFNumberDoubleType, &maxDouble))
            {
                return CTFontVariation();
            }
            double value = SkTPin(SkFixedToDouble(fontData->getAxis()[i]), minDouble, maxDouble);

            if (tagLong == opszTag) {
                opsz.isSet = true;
                opsz.value = value;
            }

            SkUniqueCFRef<CFNumberRef> valueNumber(
                    CFNumberCreate(kCFAllocatorDefault, kCFNumberDoubleType, &value));
            CFDictionaryAddValue(dict.get(), tagNumber, valueNumber.get());
        }
        return { SkUniqueCFRef<CFDictionaryRef>(std::move(dict)), opsz };
    }
    sk_sp<SkTypeface> onMakeFromFontData(std::unique_ptr<SkFontData> fontData) const override {
        // TODO: Use CTFontManagerCreateFontDescriptorsFromData when available.
        if (fontData->getIndex() != 0) {
            return nullptr;
        }

        sk_sp<SkData> data = skdata_from_skstreamasset(fontData->getStream()->duplicate());
        if (!data) {
            return nullptr;
        }
        SkUniqueCFRef<CTFontRef> ct = ctfont_from_skdata(std::move(data), fontData->getIndex());
        if (!ct) {
            return nullptr;
        }

        CTFontVariation ctVariation = ctvariation_from_skfontdata(ct.get(), fontData.get());

        SkUniqueCFRef<CTFontRef> ctVariant;
        if (ctVariation.dict) {
            SkUniqueCFRef<CFMutableDictionaryRef> attributes(
                    CFDictionaryCreateMutable(kCFAllocatorDefault, 0,
                                              &kCFTypeDictionaryKeyCallBacks,
                                              &kCFTypeDictionaryValueCallBacks));
            CFDictionaryAddValue(attributes.get(),
                                 kCTFontVariationAttribute, ctVariation.dict.get());
            SkUniqueCFRef<CTFontDescriptorRef> varDesc(
                    CTFontDescriptorCreateWithAttributes(attributes.get()));
            ctVariant.reset(CTFontCreateCopyWithAttributes(ct.get(), 0, nullptr, varDesc.get()));
        } else {
            ctVariant.reset(ct.release());
        }
        if (!ctVariant) {
            return nullptr;
        }

        return create_from_CTFontRef(std::move(ctVariant), nullptr,
                                     ctVariation.opsz, fontData->detachStream());
    }

    sk_sp<SkTypeface> onMakeFromFile(const char path[], int ttcIndex) const override {
        if (ttcIndex != 0) {
            return nullptr;
        }

        sk_sp<SkData> data = SkData::MakeFromFileName(path);
        if (!data) {
            return nullptr;
        }

        return this->onMakeFromData(std::move(data), ttcIndex);
    }

    sk_sp<SkTypeface> onLegacyMakeTypeface(const char familyName[], SkFontStyle style) const override {
        if (familyName) {
            familyName = map_css_names(familyName);
        }

        sk_sp<SkTypeface> face = create_from_name(familyName, style);
        if (face) {
            return face;
        }

        static SkTypeface* gDefaultFace;
        static SkOnce lookupDefault;
        static const char FONT_DEFAULT_NAME[] = "Lucida Sans";
        lookupDefault([]{
            gDefaultFace = create_from_name(FONT_DEFAULT_NAME, SkFontStyle()).release();
        });
        return sk_ref_sp(gDefaultFace);
    }
};

///////////////////////////////////////////////////////////////////////////////

sk_sp<SkFontMgr> SkFontMgr::Factory() { return sk_make_sp<SkFontMgr_Mac>(); }

#endif//defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_IOS)
