/* * Copyright 2020 Google Inc. * * 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) #include "include/core/SkData.h" #include "include/core/SkRefCnt.h" #include "include/private/base/SkOnce.h" #include "src/sfnt/SkOTTable_OS_2.h" #include "src/sfnt/SkSFNTHeader.h" #include "src/utils/mac/SkCTFont.h" #include "src/utils/mac/SkUniqueCFRef.h" #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 <dlfcn.h> static constexpr CGBitmapInfo kBitmapInfoRGB = ((CGBitmapInfo)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, 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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 }; /** * There does not appear to be a publicly accessible 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. */ SkCTFontSmoothBehavior SkCTFontGetSmoothBehavior() { static SkCTFontSmoothBehavior 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(), kBitmapInfoRGB)); SkUniqueCFRef<CGContextRef> smoothContext( CGBitmapContextCreate(&smoothBitmap, 16, 16, 8, 16*4, colorspace.get(), kBitmapInfoRGB)); SkUniqueCFRef<CFDataRef> data(CFDataCreateWithBytesNoCopy( kCFAllocatorDefault, kSpiderSymbol_ttf, std::size(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())); SkCTFontSmoothBehavior smoothBehavior = SkCTFontSmoothBehavior::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 SkCTFontSmoothBehavior::subpixel; } if (noSmoothBitmap[x][y] != smoothPixel) { smoothBehavior = SkCTFontSmoothBehavior::some; } } } return smoothBehavior; }(); return gSmoothBehavior; } SkCTFontWeightMapping& SkCTFontGetNSFontWeightMapping() { // In the event something goes wrong finding the real values, use this mapping. static constexpr CGFloat defaultNSFontWeights[] = { -1.00, -0.80, -0.60, -0.40, 0.00, 0.23, 0.30, 0.40, 0.56, 0.62, 1.00 }; // Declarations in <AppKit/AppKit.h> on macOS, <UIKit/UIKit.h> on iOS #ifdef SK_BUILD_FOR_MAC #define SK_KIT_FONT_WEIGHT_PREFIX … #endif #ifdef SK_BUILD_FOR_IOS #define SK_KIT_FONT_WEIGHT_PREFIX … #endif static constexpr const char* nsFontWeightNames[] = { SK_KIT_FONT_WEIGHT_PREFIX "FontWeightUltraLight", SK_KIT_FONT_WEIGHT_PREFIX "FontWeightThin", SK_KIT_FONT_WEIGHT_PREFIX "FontWeightLight", SK_KIT_FONT_WEIGHT_PREFIX "FontWeightRegular", SK_KIT_FONT_WEIGHT_PREFIX "FontWeightMedium", SK_KIT_FONT_WEIGHT_PREFIX "FontWeightSemibold", SK_KIT_FONT_WEIGHT_PREFIX "FontWeightBold", SK_KIT_FONT_WEIGHT_PREFIX "FontWeightHeavy", SK_KIT_FONT_WEIGHT_PREFIX "FontWeightBlack", }; static_assert(std::size(nsFontWeightNames) == 9, ""); static CGFloat nsFontWeights[11]; static const CGFloat (*selectedNSFontWeights)[11] = &defaultNSFontWeights; static SkOnce once; once([&] { size_t i = 0; nsFontWeights[i++] = -1.00; for (const char* nsFontWeightName : nsFontWeightNames) { void* nsFontWeightValuePtr = dlsym(RTLD_DEFAULT, nsFontWeightName); if (nsFontWeightValuePtr) { nsFontWeights[i++] = *(static_cast<CGFloat*>(nsFontWeightValuePtr)); } else { return; } } nsFontWeights[i++] = 1.00; selectedNSFontWeights = &nsFontWeights; }); return *selectedNSFontWeights; } SkCTFontWeightMapping& SkCTFontGetDataFontWeightMapping() { // In the event something goes wrong finding the real values, use this mapping. // These were the values from macOS 10.13 to 10.15. static constexpr CGFloat defaultDataFontWeights[] = { -1.00, -0.70, -0.50, -0.23, 0.00, 0.20, 0.30, 0.40, 0.60, 0.80, 1.00 }; static const CGFloat (*selectedDataFontWeights)[11] = &defaultDataFontWeights; static CGFloat dataFontWeights[11]; static SkOnce once; once([&] { constexpr size_t dataSize = std::size(kSpiderSymbol_ttf); sk_sp<SkData> data = SkData::MakeWithCopy(kSpiderSymbol_ttf, dataSize); const SkSFNTHeader* sfntHeader = reinterpret_cast<const SkSFNTHeader*>(data->data()); const SkSFNTHeader::TableDirectoryEntry* tableEntry = SkTAfter<const SkSFNTHeader::TableDirectoryEntry>(sfntHeader); const SkSFNTHeader::TableDirectoryEntry* os2TableEntry = nullptr; int numTables = SkEndian_SwapBE16(sfntHeader->numTables); for (int tableEntryIndex = 0; tableEntryIndex < numTables; ++tableEntryIndex) { if (SkOTTableOS2::TAG == tableEntry[tableEntryIndex].tag) { os2TableEntry = tableEntry + tableEntryIndex; break; } } if (!os2TableEntry) { return; } size_t os2TableOffset = SkEndian_SwapBE32(os2TableEntry->offset); SkOTTableOS2_V0* os2Table = SkTAddOffset<SkOTTableOS2_V0>(data->writable_data(), os2TableOffset); CGFloat previousWeight = -CGFLOAT_MAX; for (int i = 0; i < 11; ++i) { os2Table->usWeightClass.value = SkEndian_SwapBE16(i * 100); // On macOS 10.14 and earlier it appears that the CFDataGetBytePtr is used somehow in // font caching. Creating a slightly modified font with data at the same address seems // to in some ways act like a font previously created at that address. As a result, // always make a copy of the data. SkUniqueCFRef<CFDataRef> cfData( CFDataCreate(kCFAllocatorDefault, (const UInt8 *)data->data(), data->size())); if (!cfData) { return; } SkUniqueCFRef<CTFontDescriptorRef> desc( CTFontManagerCreateFontDescriptorFromData(cfData.get())); if (!desc) { return; } // On macOS 10.14 and earlier, the CTFontDescriptorRef returned from // CTFontManagerCreateFontDescriptorFromData is incomplete and does not have the // correct traits. It is necessary to create the CTFont and then get the descriptor // off of it. SkUniqueCFRef<CTFontRef> ctFont(CTFontCreateWithFontDescriptor(desc.get(), 9, nullptr)); if (!ctFont) { return; } SkUniqueCFRef<CTFontDescriptorRef> desc2(CTFontCopyFontDescriptor(ctFont.get())); if (!desc2) { return; } SkUniqueCFRef<CFTypeRef> traitsRef( CTFontDescriptorCopyAttribute(desc2.get(), kCTFontTraitsAttribute)); if (!traitsRef || CFGetTypeID(traitsRef.get()) != CFDictionaryGetTypeID()) { return; } CFDictionaryRef fontTraitsDict = static_cast<CFDictionaryRef>(traitsRef.get()); CFTypeRef weightRef; if (!CFDictionaryGetValueIfPresent(fontTraitsDict, kCTFontWeightTrait, &weightRef) || !weightRef) { return; } // It is possible there is a kCTFontWeightTrait entry, but it is not a CFNumberRef. // This is usually due to a bug with the handling of 0, so set the default to 0. // See https://crbug.com/1372420 CGFloat weight = 0; if (CFGetTypeID(weightRef) == CFNumberGetTypeID()) { CFNumberRef weightNumber = static_cast<CFNumberRef>(weightRef); if (!CFNumberIsFloatType(weightNumber) || !CFNumberGetValue(weightNumber, kCFNumberCGFloatType, &weight)) { // CFNumberGetValue may modify `weight` even when returning `false`. weight = 0; } } // It is expected that the weights will be strictly monotonically increasing. if (weight <= previousWeight) { return; } previousWeight = weight; dataFontWeights[i] = weight; } selectedDataFontWeights = &dataFontWeights; }); return *selectedDataFontWeights; } #endif
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