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gerrit-public.fairphone.software / platform / external / skqp / 1ee76510f5dbf632d30975fc3509ef4f609156d2 / . / src / ports / SkFontHost_mac.cpp
blob: 25030be4132952eba43469649ef24c5e3827f716 [file] [log] [blame]
/*
* 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 "SkTypes.h" // Keep this before any #ifdef ...
#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 "SkAdvancedTypefaceMetrics.h"
#include "SkCGUtils.h"
#include "SkColorPriv.h"
#include "SkDescriptor.h"
#include "SkEndian.h"
#include "SkFloatingPoint.h"
#include "SkFontDescriptor.h"
#include "SkFontMgr.h"
#include "SkGlyph.h"
#include "SkMaskGamma.h"
#include "SkMutex.h"
#include "SkOTTable_glyf.h"
#include "SkOTTable_head.h"
#include "SkOTTable_hhea.h"
#include "SkOTTable_loca.h"
#include "SkOTUtils.h"
#include "SkOncePtr.h"
#include "SkPaint.h"
#include "SkPath.h"
#include "SkSFNTHeader.h"
#include "SkStream.h"
#include "SkString.h"
#include "SkTypefaceCache.h"
#include "SkTypeface_mac.h"
#include "SkUtils.h"
#include "SkUtils.h"
#include <dlfcn.h>
// Experimental code to use a global lock whenever we access CG, to see if this reduces
// crashes in Chrome
#define USE_GLOBAL_MUTEX_FOR_CG_ACCESS
#ifdef USE_GLOBAL_MUTEX_FOR_CG_ACCESS
SK_DECLARE_STATIC_MUTEX(gCGMutex);
#define AUTO_CG_LOCK() SkAutoMutexAcquire amc(gCGMutex)
#else
#define AUTO_CG_LOCK()
#endif
// Set to make glyph bounding boxes visible.
#define SK_SHOW_TEXT_BLIT_COVERAGE 0
class SkScalerContext_Mac;
// CTFontManagerCopyAvailableFontFamilyNames() is not always available, so we
// provide a wrapper here that will return an empty array if need be.
static CFArrayRef SkCTFontManagerCopyAvailableFontFamilyNames() {
#ifdef SK_BUILD_FOR_IOS
return CFArrayCreate(nullptr, nullptr, 0, nullptr);
#else
return CTFontManagerCopyAvailableFontFamilyNames();
#endif
}
// Being templated and taking const T* prevents calling
// CFSafeRelease(autoCFRelease) through implicit conversion.
template <typename T> static void CFSafeRelease(/*CFTypeRef*/const T* cfTypeRef) {
if (cfTypeRef) {
CFRelease(cfTypeRef);
}
}
// Being templated and taking const T* prevents calling
// CFSafeRetain(autoCFRelease) through implicit conversion.
template <typename T> static void CFSafeRetain(/*CFTypeRef*/const T* cfTypeRef) {
if (cfTypeRef) {
CFRetain(cfTypeRef);
}
}
/** Acts like a CFRef, but calls CFSafeRelease when it goes out of scope. */
template<typename CFRef> class AutoCFRelease : private SkNoncopyable {
public:
explicit AutoCFRelease(CFRef cfRef = nullptr) : fCFRef(cfRef) { }
~AutoCFRelease() { CFSafeRelease(fCFRef); }
void reset(CFRef that = nullptr) {
if (that != fCFRef) {
CFSafeRelease(fCFRef);
fCFRef = that;
}
}
CFRef detach() {
CFRef self = fCFRef;
fCFRef = nullptr;
return self;
}
operator CFRef() const { return fCFRef; }
CFRef get() const { return fCFRef; }
CFRef* operator&() { SkASSERT(fCFRef == nullptr); return &fCFRef; }
private:
CFRef fCFRef;
};
static CFStringRef make_CFString(const char str[]) {
return CFStringCreateWithCString(nullptr, str, kCFStringEncodingUTF8);
}
template<typename T> class AutoCGTable : SkNoncopyable {
public:
AutoCGTable(CGFontRef font)
//Undocumented: the tag parameter in this call is expected in machine order and not BE order.
: fCFData(CGFontCopyTableForTag(font, SkSetFourByteTag(T::TAG0, T::TAG1, T::TAG2, T::TAG3)))
, fData(fCFData ? reinterpret_cast<const T*>(CFDataGetBytePtr(fCFData)) : nullptr)
{ }
const T* operator->() const { return fData; }
private:
AutoCFRelease<CFDataRef> fCFData;
public:
const T* fData;
};
// 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;
}
}
}
#include <sys/utsname.h>
typedef uint32_t CGRGBPixel;
static unsigned CGRGBPixel_getAlpha(CGRGBPixel pixel) {
return pixel & 0xFF;
}
static const char FONT_DEFAULT_NAME[] = "Lucida Sans";
// See Source/WebKit/chromium/base/mac/mac_util.mm DarwinMajorVersionInternal for original source.
static int readVersion() {
struct utsname info;
if (uname(&info) != 0) {
SkDebugf("uname failed\n");
return 0;
}
if (strcmp(info.sysname, "Darwin") != 0) {
SkDebugf("unexpected uname sysname %s\n", info.sysname);
return 0;
}
char* dot = strchr(info.release, '.');
if (!dot) {
SkDebugf("expected dot in uname release %s\n", info.release);
return 0;
}
int version = atoi(info.release);
if (version == 0) {
SkDebugf("could not parse uname release %s\n", info.release);
}
return version;
}
static int darwinVersion() {
static int darwin_version = readVersion();
return darwin_version;
}
static bool isSnowLeopard() {
return darwinVersion() == 10;
}
static bool isLion() {
return darwinVersion() == 11;
}
static bool isMountainLion() {
return darwinVersion() == 12;
}
static bool isLCDFormat(unsigned format) {
return SkMask::kLCD16_Format == format;
}
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 cgFloat;
} else {
SkASSERT(sizeof(CGFloat) == sizeof(double));
return SkDoubleToScalar(cgFloat);
}
}
static CGAffineTransform MatrixToCGAffineTransform(const SkMatrix& matrix,
SkScalar sx = SK_Scalar1,
SkScalar sy = SK_Scalar1) {
return CGAffineTransformMake( ScalarToCG(matrix[SkMatrix::kMScaleX] * sx),
-ScalarToCG(matrix[SkMatrix::kMSkewY] * sy),
-ScalarToCG(matrix[SkMatrix::kMSkewX] * sx),
ScalarToCG(matrix[SkMatrix::kMScaleY] * sy),
ScalarToCG(matrix[SkMatrix::kMTransX] * sx),
ScalarToCG(matrix[SkMatrix::kMTransY] * sy));
}
///////////////////////////////////////////////////////////////////////////////
#define BITMAP_INFO_RGB (kCGImageAlphaNoneSkipFirst | kCGBitmapByteOrder32Host)
/**
* 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 bool supports_LCD() {
static int gSupportsLCD = -1;
if (gSupportsLCD >= 0) {
return (bool) gSupportsLCD;
}
uint32_t rgb = 0;
AutoCFRelease<CGColorSpaceRef> colorspace(CGColorSpaceCreateDeviceRGB());
AutoCFRelease<CGContextRef> cgContext(CGBitmapContextCreate(&rgb, 1, 1, 8, 4,
colorspace, BITMAP_INFO_RGB));
CGContextSelectFont(cgContext, "Helvetica", 16, kCGEncodingMacRoman);
CGContextSetShouldSmoothFonts(cgContext, true);
CGContextSetShouldAntialias(cgContext, true);
CGContextSetTextDrawingMode(cgContext, kCGTextFill);
CGContextSetGrayFillColor(cgContext, 1, 1);
CGContextShowTextAtPoint(cgContext, -1, 0, "|", 1);
uint32_t r = (rgb >> 16) & 0xFF;
uint32_t g = (rgb >> 8) & 0xFF;
uint32_t b = (rgb >> 0) & 0xFF;
gSupportsLCD = (r != g || r != b);
return (bool) gSupportsLCD;
}
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;
AutoCFRelease<CGColorSpaceRef> fRGBSpace;
// cached state
AutoCFRelease<CGContextRef> fCG;
SkISize fSize;
bool fDoAA;
bool fDoLCD;
static int RoundSize(int dimension) {
return SkNextPow2(dimension);
}
};
///////////////////////////////////////////////////////////////////////////////
static bool find_dict_float(CFDictionaryRef dict, CFStringRef name, float* value) {
CFNumberRef num;
return CFDictionaryGetValueIfPresent(dict, name, (const void**)&num)
&& CFNumberIsFloatType(num)
&& CFNumberGetValue(num, kCFNumberFloatType, value);
}
static int unit_weight_to_fontstyle(float unit) {
float value;
if (unit < 0) {
value = 100 + (1 + unit) * 300;
} else {
value = 400 + unit * 500;
}
return sk_float_round2int(value);
}
static int unit_width_to_fontstyle(float unit) {
float value;
if (unit < 0) {
value = 1 + (1 + unit) * 4;
} else {
value = 5 + unit * 4;
}
return sk_float_round2int(value);
}
static SkFontStyle fontstyle_from_descriptor(CTFontDescriptorRef desc) {
AutoCFRelease<CFDictionaryRef> dict(
(CFDictionaryRef)CTFontDescriptorCopyAttribute(desc, kCTFontTraitsAttribute));
if (nullptr == dict.get()) {
return SkFontStyle();
}
float weight, width, slant;
if (!find_dict_float(dict, kCTFontWeightTrait, &weight)) {
weight = 0;
}
if (!find_dict_float(dict, kCTFontWidthTrait, &width)) {
width = 0;
}
if (!find_dict_float(dict, kCTFontSlantTrait, &slant)) {
slant = 0;
}
return SkFontStyle(unit_weight_to_fontstyle(weight),
unit_width_to_fontstyle(width),
slant ? SkFontStyle::kItalic_Slant
: SkFontStyle::kUpright_Slant);
}
static SkTypeface::Style computeStyleBits(CTFontRef font, bool* isFixedPitch) {
unsigned style = SkTypeface::kNormal;
CTFontSymbolicTraits traits = CTFontGetSymbolicTraits(font);
if (traits & kCTFontBoldTrait) {
style |= SkTypeface::kBold;
}
if (traits & kCTFontItalicTrait) {
style |= SkTypeface::kItalic;
}
if (isFixedPitch) {
*isFixedPitch = (traits & kCTFontMonoSpaceTrait) != 0;
}
return (SkTypeface::Style)style;
}
#define WEIGHT_THRESHOLD ((SkFontStyle::kNormal_Weight + SkFontStyle::kBold_Weight)/2)
// kCTFontColorGlyphsTrait was added in the Mac 10.7 and iPhone 4.3 SDKs.
// Being an enum value it is not guarded by version macros, but old SDKs must still be supported.
#if defined(__MAC_10_7) || defined(__IPHONE_4_3)
static const uint32_t SkCTFontColorGlyphsTrait = kCTFontColorGlyphsTrait;
#else
static const uint32_t SkCTFontColorGlyphsTrait = (1 << 13);
#endif
class SkTypeface_Mac : public SkTypeface {
public:
SkTypeface_Mac(CTFontRef fontRef, CFTypeRef resourceRef,
const SkFontStyle& fs, bool isFixedPitch,
const char requestedName[], bool isLocalStream)
: SkTypeface(fs, SkTypefaceCache::NewFontID(), isFixedPitch)
, fRequestedName(requestedName)
, fFontRef(fontRef) // caller has already called CFRetain for us
, fOriginatingCFTypeRef(resourceRef) // caller has already called CFRetain for us
, fHasColorGlyphs(SkToBool(CTFontGetSymbolicTraits(fFontRef) & SkCTFontColorGlyphsTrait))
, fIsLocalStream(isLocalStream)
{
SkASSERT(fontRef);
}
SkString fRequestedName;
AutoCFRelease<CTFontRef> fFontRef;
AutoCFRelease<CFTypeRef> fOriginatingCFTypeRef;
const bool fHasColorGlyphs;
protected:
int onGetUPEM() const override;
SkStreamAsset* onOpenStream(int* ttcIndex) const override;
SkFontData* onCreateFontData() const override;
void onGetFamilyName(SkString* familyName) const override;
SkTypeface::LocalizedStrings* onCreateFamilyNameIterator() const override;
int onGetTableTags(SkFontTableTag tags[]) const override;
virtual size_t onGetTableData(SkFontTableTag, size_t offset,
size_t length, void* data) const override;
SkScalerContext* onCreateScalerContext(const SkDescriptor*) const override;
void onFilterRec(SkScalerContextRec*) const override;
void onGetFontDescriptor(SkFontDescriptor*, bool*) const override;
virtual SkAdvancedTypefaceMetrics* onGetAdvancedTypefaceMetrics(
PerGlyphInfo,
const uint32_t*, uint32_t) const override;
virtual int onCharsToGlyphs(const void* chars, Encoding, uint16_t glyphs[],
int glyphCount) const override;
int onCountGlyphs() const override;
private:
bool fIsLocalStream;
typedef SkTypeface INHERITED;
};
/** Creates a typeface without searching the cache. Takes ownership of the CTFontRef. */
static SkTypeface* NewFromFontRef(CTFontRef fontRef, CFTypeRef resourceRef,
const char name[], bool isLocalStream)
{
SkASSERT(fontRef);
bool isFixedPitch;
SkFontStyle style = SkFontStyle(computeStyleBits(fontRef, &isFixedPitch));
return new SkTypeface_Mac(fontRef, resourceRef, style, isFixedPitch, name, isLocalStream);
}
static bool find_by_CTFontRef(SkTypeface* cached, const SkFontStyle&, void* context) {
CTFontRef self = (CTFontRef)context;
CTFontRef other = ((SkTypeface_Mac*)cached)->fFontRef;
return CFEqual(self, other);
}
/** Creates a typeface from a name, searching the cache. */
static SkTypeface* NewFromName(const char familyName[], const SkFontStyle& theStyle) {
CTFontSymbolicTraits ctFontTraits = 0;
if (theStyle.weight() >= SkFontStyle::kBold_Weight) {
ctFontTraits |= kCTFontBoldTrait;
}
if (theStyle.slant() != SkFontStyle::kUpright_Slant) {
ctFontTraits |= kCTFontItalicTrait;
}
//TODO: add weight width slant
// Create the font info
AutoCFRelease<CFStringRef> cfFontName(make_CFString(familyName));
AutoCFRelease<CFNumberRef> cfFontTraits(
CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &ctFontTraits));
AutoCFRelease<CFMutableDictionaryRef> cfAttributes(
CFDictionaryCreateMutable(kCFAllocatorDefault, 0,
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks));
AutoCFRelease<CFMutableDictionaryRef> cfTraits(
CFDictionaryCreateMutable(kCFAllocatorDefault, 0,
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks));
if (!cfFontName || !cfFontTraits || !cfAttributes || !cfTraits) {
return nullptr;
}
CFDictionaryAddValue(cfTraits, kCTFontSymbolicTrait, cfFontTraits);
CFDictionaryAddValue(cfAttributes, kCTFontFamilyNameAttribute, cfFontName);
CFDictionaryAddValue(cfAttributes, kCTFontTraitsAttribute, cfTraits);
AutoCFRelease<CTFontDescriptorRef> ctFontDesc(
CTFontDescriptorCreateWithAttributes(cfAttributes));
if (!ctFontDesc) {
return nullptr;
}
AutoCFRelease<CTFontRef> ctFont(CTFontCreateWithFontDescriptor(ctFontDesc, 0, nullptr));
if (!ctFont) {
return nullptr;
}
SkTypeface* face = SkTypefaceCache::FindByProcAndRef(find_by_CTFontRef, (void*)ctFont.get());
if (!face) {
face = NewFromFontRef(ctFont.detach(), nullptr, nullptr, false);
SkTypefaceCache::Add(face, face->fontStyle());
}
return face;
}
SK_DECLARE_STATIC_MUTEX(gGetDefaultFaceMutex);
static SkTypeface* GetDefaultFace() {
SkAutoMutexAcquire ma(gGetDefaultFaceMutex);
static SkTypeface* gDefaultFace;
if (nullptr == gDefaultFace) {
gDefaultFace = NewFromName(FONT_DEFAULT_NAME, SkFontStyle());
SkTypefaceCache::Add(gDefaultFace, SkFontStyle());
}
return gDefaultFace;
}
///////////////////////////////////////////////////////////////////////////////
extern CTFontRef SkTypeface_GetCTFontRef(const SkTypeface* face);
CTFontRef SkTypeface_GetCTFontRef(const SkTypeface* face) {
const SkTypeface_Mac* macface = (const SkTypeface_Mac*)face;
return macface ? macface->fFontRef.get() : nullptr;
}
/* 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 fontRef, CFTypeRef resourceRef) {
SkTypeface* face = SkTypefaceCache::FindByProcAndRef(find_by_CTFontRef, (void*)fontRef);
if (!face) {
CFRetain(fontRef);
if (resourceRef) {
CFRetain(resourceRef);
}
face = NewFromFontRef(fontRef, resourceRef, nullptr, false);
SkTypefaceCache::Add(face, face->fontStyle());
}
return face;
}
struct NameStyle {
const char* fName;
SkFontStyle fStyle;
};
static bool find_by_NameStyle(SkTypeface* cachedFace, const SkFontStyle& cachedStyle, void* ctx) {
const SkTypeface_Mac* cachedMacFace = static_cast<SkTypeface_Mac*>(cachedFace);
const NameStyle* requested = static_cast<const NameStyle*>(ctx);
return cachedStyle == requested->fStyle
&& cachedMacFace->fRequestedName.equals(requested->fName);
}
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
}
///////////////////////////////////////////////////////////////////////////////
/** GlyphRect is in FUnits (em space, y up). */
struct GlyphRect {
int16_t fMinX;
int16_t fMinY;
int16_t fMaxX;
int16_t fMaxY;
};
class SkScalerContext_Mac : public SkScalerContext {
public:
SkScalerContext_Mac(SkTypeface_Mac*, const SkDescriptor*);
protected:
unsigned generateGlyphCount(void) override;
uint16_t generateCharToGlyph(SkUnichar uni) override;
void generateAdvance(SkGlyph* glyph) override;
void generateMetrics(SkGlyph* glyph) override;
void generateImage(const SkGlyph& glyph) override;
void generatePath(const SkGlyph& glyph, SkPath* path) override;
void generateFontMetrics(SkPaint::FontMetrics*) override;
private:
static void CTPathElement(void *info, const CGPathElement *element);
/** Returns the offset from the horizontal origin to the vertical origin in SkGlyph units. */
void getVerticalOffset(CGGlyph glyphID, SkPoint* offset) const;
/** Initializes and returns the value of fFBoundingBoxesGlyphOffset.
*
* For use with (and must be called before) generateBBoxes.
*/
uint16_t getFBoundingBoxesGlyphOffset();
/** Initializes fFBoundingBoxes and returns true on success.
*
* On Lion and Mountain Lion, CTFontGetBoundingRectsForGlyphs has a bug which causes it to
* return a bad value in bounds.origin.x for SFNT fonts whose hhea::numberOfHMetrics is
* less than its maxp::numGlyphs. When this is the case we try to read the bounds from the
* font directly.
*
* This routine initializes fFBoundingBoxes to an array of
* fGlyphCount - fFBoundingBoxesGlyphOffset GlyphRects which contain the bounds in FUnits
* (em space, y up) of glyphs with ids in the range [fFBoundingBoxesGlyphOffset, fGlyphCount).
*
* Returns true if fFBoundingBoxes is properly initialized. The table can only be properly
* initialized for a TrueType font with 'head', 'loca', and 'glyf' tables.
*
* TODO: A future optimization will compute fFBoundingBoxes once per fCTFont.
*/
bool generateBBoxes();
/** Converts from FUnits (em space, y up) to SkGlyph units (pixels, y down).
*
* Used on Snow Leopard to correct CTFontGetVerticalTranslationsForGlyphs.
* Used on Lion to correct CTFontGetBoundingRectsForGlyphs.
*/
SkMatrix fFUnitMatrix;
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 kCTFontDefaultOrientation dangerous, because the metrics from
* kCTFontHorizontalOrientation are in a different space from kCTFontVerticalOrientation.
* With kCTFontVerticalOrientation 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.
*/
AutoCFRelease<CTFontRef> fCTFont;
/** The transform without the font size. */
CGAffineTransform fTransform;
CGAffineTransform fInvTransform;
AutoCFRelease<CGFontRef> fCGFont;
SkAutoTMalloc<GlyphRect> fFBoundingBoxes;
uint16_t fFBoundingBoxesGlyphOffset;
uint16_t fGlyphCount;
bool fGeneratedFBoundingBoxes;
const bool fDoSubPosition;
const bool fVertical;
friend class Offscreen;
typedef SkScalerContext INHERITED;
};
// 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 CTFontRef ctfont_create_exact_copy(CTFontRef baseFont, CGFloat textSize,
const CGAffineTransform* transform)
{
AutoCFRelease<CGFontRef> baseCGFont(CTFontCopyGraphicsFont(baseFont, nullptr));
// The last parameter (CTFontDescriptorRef attributes) *must* be nullptr.
// If non-nullptr 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'.
return CTFontCreateWithGraphicsFont(baseCGFont, textSize, transform, nullptr);
}
SkScalerContext_Mac::SkScalerContext_Mac(SkTypeface_Mac* typeface,
const SkDescriptor* desc)
: INHERITED(typeface, desc)
, fFBoundingBoxes()
, fFBoundingBoxesGlyphOffset(0)
, fGeneratedFBoundingBoxes(false)
, fDoSubPosition(SkToBool(fRec.fFlags & kSubpixelPositioning_Flag))
, fVertical(SkToBool(fRec.fFlags & kVertical_Flag))
{
AUTO_CG_LOCK();
CTFontRef ctFont = typeface->fFontRef.get();
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;
fRec.computeMatrices(SkScalerContextRec::kVertical_PreMatrixScale, &scale, &skTransform,
nullptr, nullptr, &fFUnitMatrix);
fTransform = MatrixToCGAffineTransform(skTransform);
fInvTransform = CGAffineTransformInvert(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.reset(ctfont_create_exact_copy(ctFont, textSize, nullptr));
fCGFont.reset(CTFontCopyGraphicsFont(fCTFont, nullptr));
// The fUnitMatrix includes the text size (and em) as it is used to scale the raw font data.
SkScalar emPerFUnit = SkScalarInvert(SkIntToScalar(CGFontGetUnitsPerEm(fCGFont)));
fFUnitMatrix.preScale(emPerFUnit, -emPerFUnit);
}
/** This is an implementation of CTFontDrawGlyphs for 10.6; it was introduced in 10.7. */
static void legacy_CTFontDrawGlyphs(CTFontRef, const CGGlyph glyphs[], const CGPoint points[],
size_t count, CGContextRef cg) {
CGContextShowGlyphsAtPositions(cg, glyphs, points, count);
}
typedef decltype(legacy_CTFontDrawGlyphs) CTFontDrawGlyphsProc;
static CTFontDrawGlyphsProc* choose_CTFontDrawGlyphs() {
if (void* real = dlsym(RTLD_DEFAULT, "CTFontDrawGlyphs")) {
return (CTFontDrawGlyphsProc*)real;
}
return &legacy_CTFontDrawGlyphs;
}
SK_DECLARE_STATIC_ONCE_PTR(CTFontDrawGlyphsProc, gCTFontDrawGlyphs);
CGRGBPixel* Offscreen::getCG(const SkScalerContext_Mac& context, const SkGlyph& glyph,
CGGlyph glyphID, size_t* rowBytesPtr,
bool generateA8FromLCD) {
auto ctFontDrawGlyphs = gCTFontDrawGlyphs.get(choose_CTFontDrawGlyphs);
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 smoothed text is always g=2.0.
fRGBSpace.reset(CGColorSpaceCreateDeviceRGB());
}
// default to kBW_Format
bool doAA = false;
bool doLCD = false;
if (SkMask::kBW_Format != glyph.fMaskFormat) {
doLCD = true;
doAA = true;
}
// FIXME: lcd smoothed un-hinted rasterization unsupported.
if (!generateA8FromLCD && SkMask::kA8_Format == glyph.fMaskFormat) {
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 be ugly too (white on transparent), but TODO: we can detect gray and set to A8.
if (SkMask::kARGB32_Format == glyph.fMaskFormat) {
doLCD = false;
}
size_t rowBytes = fSize.fWidth * sizeof(CGRGBPixel);
if (!fCG || fSize.fWidth < glyph.fWidth || fSize.fHeight < glyph.fHeight) {
if (fSize.fWidth < glyph.fWidth) {
fSize.fWidth = RoundSize(glyph.fWidth);
}
if (fSize.fHeight < glyph.fHeight) {
fSize.fHeight = RoundSize(glyph.fHeight);
}
rowBytes = fSize.fWidth * sizeof(CGRGBPixel);
void* image = fImageStorage.reset(rowBytes * fSize.fHeight);
const CGImageAlphaInfo alpha = (SkMask::kARGB32_Format == glyph.fMaskFormat)
? kCGImageAlphaPremultipliedFirst
: kCGImageAlphaNoneSkipFirst;
const CGBitmapInfo bitmapInfo = kCGBitmapByteOrder32Host | alpha;
fCG.reset(CGBitmapContextCreate(image, fSize.fWidth, fSize.fHeight, 8,
rowBytes, fRGBSpace, bitmapInfo));
// Skia handles quantization and subpixel positioning,
// so disable quantization and enabe subpixel positioning in CG.
CGContextSetAllowsFontSubpixelQuantization(fCG, false);
CGContextSetShouldSubpixelQuantizeFonts(fCG, 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, true);
CGContextSetShouldSubpixelPositionFonts(fCG, true);
CGContextSetTextDrawingMode(fCG, kCGTextFill);
// Draw white on black to create mask.
// TODO: Draw black on white and invert, CG has a special case codepath.
CGContextSetGrayFillColor(fCG, 1.0f, 1.0f);
// force our checks below to happen
fDoAA = !doAA;
fDoLCD = !doLCD;
if (legacy_CTFontDrawGlyphs == ctFontDrawGlyphs) {
// CTFontDrawGlyphs will apply the font, font size, and font matrix to the CGContext.
// Our 'fake' one does not, so set up the CGContext here.
CGContextSetFont(fCG, context.fCGFont);
CGContextSetFontSize(fCG, CTFontGetSize(context.fCTFont));
}
CGContextSetTextMatrix(fCG, context.fTransform);
}
if (fDoAA != doAA) {
CGContextSetShouldAntialias(fCG, doAA);
fDoAA = doAA;
}
if (fDoLCD != doLCD) {
CGContextSetShouldSmoothFonts(fCG, doLCD);
fDoLCD = doLCD;
}
CGRGBPixel* image = (CGRGBPixel*)fImageStorage.get();
// skip rows based on the glyph's height
image += (fSize.fHeight - glyph.fHeight) * fSize.fWidth;
// erase to black
sk_memset_rect32(image, 0, glyph.fWidth, glyph.fHeight, rowBytes);
float subX = 0;
float subY = 0;
if (context.fDoSubPosition) {
subX = SkFixedToFloat(glyph.getSubXFixed());
subY = SkFixedToFloat(glyph.getSubYFixed());
}
// CoreText and CoreGraphics always draw using the horizontal baseline origin.
if (context.fVertical) {
SkPoint offset;
context.getVerticalOffset(glyphID, &offset);
subX += offset.fX;
subY += offset.fY;
}
CGPoint point = CGPointMake(-glyph.fLeft + subX, glyph.fTop + glyph.fHeight - 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, &glyphID, &point, 1, fCG);
SkASSERT(rowBytesPtr);
*rowBytesPtr = rowBytes;
return image;
}
void SkScalerContext_Mac::getVerticalOffset(CGGlyph glyphID, SkPoint* offset) const {
// Snow Leopard returns cgVertOffset in completely un-transformed FUnits (em space, y up).
// Lion and Leopard return cgVertOffset in CG units (pixels, y up).
CGSize cgVertOffset;
CTFontGetVerticalTranslationsForGlyphs(fCTFont, &glyphID, &cgVertOffset, 1);
if (isSnowLeopard()) {
SkPoint skVertOffset = { CGToScalar(cgVertOffset.width), CGToScalar(cgVertOffset.height) };
// From FUnits (em space, y up) to SkGlyph units (pixels, y down).
fFUnitMatrix.mapPoints(&skVertOffset, 1);
*offset = skVertOffset;
return;
}
cgVertOffset = CGSizeApplyAffineTransform(cgVertOffset, fTransform);
SkPoint skVertOffset = { CGToScalar(cgVertOffset.width), CGToScalar(cgVertOffset.height) };
// From CG units (pixels, y up) to SkGlyph units (pixels, y down).
skVertOffset.fY = -skVertOffset.fY;
*offset = skVertOffset;
}
uint16_t SkScalerContext_Mac::getFBoundingBoxesGlyphOffset() {
if (fFBoundingBoxesGlyphOffset) {
return fFBoundingBoxesGlyphOffset;
}
fFBoundingBoxesGlyphOffset = fGlyphCount; // fallback for all fonts
AutoCGTable<SkOTTableHorizontalHeader> hheaTable(fCGFont);
if (hheaTable.fData) {
fFBoundingBoxesGlyphOffset = SkEndian_SwapBE16(hheaTable->numberOfHMetrics);
}
return fFBoundingBoxesGlyphOffset;
}
bool SkScalerContext_Mac::generateBBoxes() {
if (fGeneratedFBoundingBoxes) {
return SkToBool(fFBoundingBoxes.get());
}
fGeneratedFBoundingBoxes = true;
AutoCGTable<SkOTTableHead> headTable(fCGFont);
if (!headTable.fData) {
return false;
}
AutoCGTable<SkOTTableIndexToLocation> locaTable(fCGFont);
if (!locaTable.fData) {
return false;
}
AutoCGTable<SkOTTableGlyph> glyfTable(fCGFont);
if (!glyfTable.fData) {
return false;
}
uint16_t entries = fGlyphCount - fFBoundingBoxesGlyphOffset;
fFBoundingBoxes.reset(entries);
SkOTTableHead::IndexToLocFormat locaFormat = headTable->indexToLocFormat;
SkOTTableGlyph::Iterator glyphDataIter(*glyfTable.fData, *locaTable.fData, locaFormat);
glyphDataIter.advance(fFBoundingBoxesGlyphOffset);
for (uint16_t boundingBoxesIndex = 0; boundingBoxesIndex < entries; ++boundingBoxesIndex) {
const SkOTTableGlyphData* glyphData = glyphDataIter.next();
GlyphRect& rect = fFBoundingBoxes[boundingBoxesIndex];
rect.fMinX = SkEndian_SwapBE16(glyphData->xMin);
rect.fMinY = SkEndian_SwapBE16(glyphData->yMin);
rect.fMaxX = SkEndian_SwapBE16(glyphData->xMax);
rect.fMaxY = SkEndian_SwapBE16(glyphData->yMax);
}
return true;
}
unsigned SkScalerContext_Mac::generateGlyphCount(void) {
return fGlyphCount;
}
uint16_t SkScalerContext_Mac::generateCharToGlyph(SkUnichar uni) {
AUTO_CG_LOCK();
CGGlyph cgGlyph[2];
UniChar theChar[2]; // UniChar is a UTF-16 16-bit code unit.
// Get the glyph
size_t numUniChar = SkUTF16_FromUnichar(uni, theChar);
SkASSERT(sizeof(CGGlyph) <= sizeof(uint16_t));
// 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.
CTFontGetGlyphsForCharacters(fCTFont, theChar, cgGlyph, numUniChar);
return cgGlyph[0];
}
void SkScalerContext_Mac::generateAdvance(SkGlyph* glyph) {
this->generateMetrics(glyph);
}
void SkScalerContext_Mac::generateMetrics(SkGlyph* glyph) {
AUTO_CG_LOCK();
const CGGlyph cgGlyph = (CGGlyph) glyph->getGlyphID();
glyph->zeroMetrics();
// The following block produces cgAdvance in CG units (pixels, y up).
CGSize cgAdvance;
if (fVertical) {
CTFontGetAdvancesForGlyphs(fCTFont, kCTFontVerticalOrientation,
&cgGlyph, &cgAdvance, 1);
// Vertical advances are returned as widths instead of heights.
SkTSwap(cgAdvance.height, cgAdvance.width);
cgAdvance.height = -cgAdvance.height;
} else {
CTFontGetAdvancesForGlyphs(fCTFont, kCTFontHorizontalOrientation,
&cgGlyph, &cgAdvance, 1);
}
cgAdvance = CGSizeApplyAffineTransform(cgAdvance, fTransform);
glyph->fAdvanceX = SkFloatToFixed_Check(cgAdvance.width);
glyph->fAdvanceY = -SkFloatToFixed_Check(cgAdvance.height);
// The following produces skBounds in SkGlyph units (pixels, y down),
// or returns early if skBounds would be empty.
SkRect skBounds;
// On Mountain Lion, CTFontGetBoundingRectsForGlyphs with kCTFontVerticalOrientation and
// CTFontGetVerticalTranslationsForGlyphs do not agree when using OTF CFF fonts.
// For TTF fonts these two do agree and we can use CTFontGetBoundingRectsForGlyphs to get
// the bounding box and CTFontGetVerticalTranslationsForGlyphs to then draw the glyph
// inside that bounding box. However, with OTF CFF fonts this does not work. It appears that
// CTFontGetBoundingRectsForGlyphs with kCTFontVerticalOrientation on OTF CFF fonts tries
// to center the glyph along the vertical baseline and also perform some mysterious shift
// along the baseline. CTFontGetVerticalTranslationsForGlyphs does not appear to perform
// these steps.
//
// It is not known which is correct (or if either is correct). However, we must always draw
// from the horizontal origin and must use CTFontGetVerticalTranslationsForGlyphs to draw.
// As a result, we do not call CTFontGetBoundingRectsForGlyphs for vertical glyphs.
// On Snow Leopard, CTFontGetBoundingRectsForGlyphs ignores kCTFontVerticalOrientation and
// returns horizontal bounds.
// On Lion and Mountain Lion, CTFontGetBoundingRectsForGlyphs has a bug which causes it to
// return a bad value in cgBounds.origin.x for SFNT fonts whose hhea::numberOfHMetrics is
// less than its maxp::numGlyphs. When this is the case we try to read the bounds from the
// font directly.
if ((isLion() || isMountainLion()) &&
(cgGlyph < fGlyphCount && cgGlyph >= getFBoundingBoxesGlyphOffset() && generateBBoxes()))
{
const GlyphRect& gRect = fFBoundingBoxes[cgGlyph - fFBoundingBoxesGlyphOffset];
if (gRect.fMinX >= gRect.fMaxX || gRect.fMinY >= gRect.fMaxY) {
return;
}
skBounds = SkRect::MakeLTRB(gRect.fMinX, gRect.fMinY, gRect.fMaxX, gRect.fMaxY);
// From FUnits (em space, y up) to SkGlyph units (pixels, y down).
fFUnitMatrix.mapRect(&skBounds);
} else {
// CTFontGetBoundingRectsForGlyphs produces cgBounds in CG units (pixels, y up).
CGRect cgBounds;
CTFontGetBoundingRectsForGlyphs(fCTFont, kCTFontHorizontalOrientation,
&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) {
AutoCFRelease<CGPathRef> path(CTFontCreatePathForGlyph(fCTFont, cgGlyph, nullptr));
if (nullptr == path || CGPathIsEmpty(path)) {
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);
}
if (fVertical) {
// Due to all of the vertical bounds bugs, skBounds is always the horizontal bounds.
// Convert these horizontal bounds into vertical bounds.
SkPoint offset;
getVerticalOffset(cgGlyph, &offset);
skBounds.offset(offset);
}
// 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());
}
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());
}
#include "SkColorPriv.h"
static void build_power_table(uint8_t table[], float ee) {
for (int i = 0; i < 256; i++) {
float x = i / 255.f;
x = sk_float_pow(x, ee);
int xx = SkScalarRoundToInt(x * 255);
table[i] = SkToU8(xx);
}
}
/**
* This will invert the gamma applied by CoreGraphics, so we can get linear
* values.
*
* CoreGraphics obscurely defaults to 2.0 as the smoothing gamma value.
* The color space used does not appear to affect this choice.
*/
static const uint8_t* getInverseGammaTableCoreGraphicSmoothing() {
static bool gInited;
static uint8_t gTableCoreGraphicsSmoothing[256];
if (!gInited) {
build_power_table(gTableCoreGraphicsSmoothing, 2.0f);
gInited = true;
}
return gTableCoreGraphicsSmoothing;
}
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) << 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 = (rgb >> 16) & 0xFF;
U8CPU g = (rgb >> 8) & 0xFF;
U8CPU b = (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>
static void rgb_to_a8(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 = (CGRGBPixel*)((char*)cgPixels + cgRowBytes);
dst += dstRB;
}
}
template<bool APPLY_PREBLEND>
static inline uint16_t rgb_to_lcd16(CGRGBPixel rgb, const uint8_t* tableR,
const uint8_t* tableG,
const uint8_t* tableB) {
U8CPU r = sk_apply_lut_if<APPLY_PREBLEND>((rgb >> 16) & 0xFF, tableR);
U8CPU g = sk_apply_lut_if<APPLY_PREBLEND>((rgb >> 8) & 0xFF, tableG);
U8CPU b = sk_apply_lut_if<APPLY_PREBLEND>((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>
static void rgb_to_lcd16(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] = rgb_to_lcd16<APPLY_PREBLEND>(cgPixels[i], tableR, tableG, tableB);
}
cgPixels = (CGRGBPixel*)((char*)cgPixels + cgRowBytes);
dst = (uint16_t*)((char*)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);
}
template <typename T> T* SkTAddByteOffset(T* ptr, size_t byteOffset) {
return (T*)((char*)ptr + byteOffset);
}
void SkScalerContext_Mac::generateImage(const SkGlyph& glyph) {
CGGlyph cgGlyph = (CGGlyph) glyph.getGlyphID();
// FIXME: lcd smoothed un-hinted rasterization unsupported.
bool generateA8FromLCD = fRec.getHinting() != SkPaint::kNo_Hinting;
// Draw the glyph
size_t cgRowBytes;
CGRGBPixel* cgPixels = fOffscreen.getCG(*this, glyph, cgGlyph, &cgRowBytes, generateA8FromLCD);
if (cgPixels == nullptr) {
return;
}
//TODO: see if drawing black on white and inverting is faster (at least in
//lcd case) as core graphics appears to have special case code for drawing
//black text.
// Fix the glyph
const bool isLCD = isLCDFormat(glyph.fMaskFormat);
if (isLCD || (glyph.fMaskFormat == SkMask::kA8_Format && supports_LCD() && generateA8FromLCD)) {
const uint8_t* table = getInverseGammaTableCoreGraphicSmoothing();
//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] = (table[r] << 16) | (table[g] << 8) | table[b];
}
addr = SkTAddByteOffset(addr, cgRowBytes);
}
}
// Convert glyph to mask
switch (glyph.fMaskFormat) {
case SkMask::kLCD16_Format: {
if (fPreBlend.isApplicable()) {
rgb_to_lcd16<true>(cgPixels, cgRowBytes, glyph,
fPreBlend.fR, fPreBlend.fG, fPreBlend.fB);
} else {
rgb_to_lcd16<false>(cgPixels, cgRowBytes, glyph,
fPreBlend.fR, fPreBlend.fG, fPreBlend.fB);
}
} break;
case SkMask::kA8_Format: {
if (fPreBlend.isApplicable()) {
rgb_to_a8<true>(cgPixels, cgRowBytes, glyph, fPreBlend.fG);
} else {
rgb_to_a8<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 = (CGRGBPixel*)((char*)cgPixels + cgRowBytes);
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 = (CGRGBPixel*)((char*)cgPixels + cgRowBytes);
dst = (SkPMColor*)((char*)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)
void SkScalerContext_Mac::generatePath(const SkGlyph& glyph, SkPath* path) {
AUTO_CG_LOCK();
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) {
SkMatrix m;
fRec.getSingleMatrix(&m);
// 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 (SkComputeAxisAlignmentForHText(m)) {
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 = (CGGlyph)glyph.getGlyphID();
AutoCFRelease<CGPathRef> cgPath(CTFontCreatePathForGlyph(fCTFont, cgGlyph, &xform));
path->reset();
if (cgPath != nullptr) {
CGPathApply(cgPath, path, SkScalerContext_Mac::CTPathElement);
}
if (fDoSubPosition) {
SkMatrix m;
m.setScale(SkScalarInvert(scaleX), SkScalarInvert(scaleY));
path->transform(m);
}
if (fVertical) {
SkPoint offset;
getVerticalOffset(cgGlyph, &offset);
path->offset(offset.fX, offset.fY);
}
}
void SkScalerContext_Mac::generateFontMetrics(SkPaint::FontMetrics* metrics) {
if (nullptr == metrics) {
return;
}
AUTO_CG_LOCK();
CGRect theBounds = CTFontGetBoundingBox(fCTFont);
metrics->fTop = CGToScalar(-CGRectGetMaxY_inline(theBounds));
metrics->fAscent = CGToScalar(-CTFontGetAscent(fCTFont));
metrics->fDescent = CGToScalar( CTFontGetDescent(fCTFont));
metrics->fBottom = CGToScalar(-CGRectGetMinY_inline(theBounds));
metrics->fLeading = CGToScalar( CTFontGetLeading(fCTFont));
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));
metrics->fCapHeight = CGToScalar( CTFontGetCapHeight(fCTFont));
metrics->fUnderlineThickness = CGToScalar( CTFontGetUnderlineThickness(fCTFont));
metrics->fUnderlinePosition = -CGToScalar( CTFontGetUnderlinePosition(fCTFont));
metrics->fFlags |= SkPaint::FontMetrics::kUnderlineThinknessIsValid_Flag;
metrics->fFlags |= SkPaint::FontMetrics::kUnderlinePositionIsValid_Flag;
}
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;
}
}
///////////////////////////////////////////////////////////////////////////////
// Returns nullptr on failure
// Call must still manage its ownership of provider
static SkTypeface* create_from_dataProvider(CGDataProviderRef provider) {
AutoCFRelease<CGFontRef> cg(CGFontCreateWithDataProvider(provider));
if (nullptr == cg) {
return nullptr;
}
CTFontRef ct = CTFontCreateWithGraphicsFont(cg, 0, nullptr, nullptr);
return ct ? NewFromFontRef(ct, nullptr, nullptr, true) : nullptr;
}
// Web fonts added to the 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,
SkTDArray<SkUnichar>* glyphToUnicode) {
glyphToUnicode->setCount(SkToInt(glyphCount));
SkUnichar* out = glyphToUnicode->begin();
sk_bzero(out, glyphCount * sizeof(SkUnichar));
UniChar unichar = 0;
while (glyphCount > 0) {
CGGlyph glyph;
if (CTFontGetGlyphsForCharacters(ctFont, &unichar, &glyph, 1)) {
out[glyph] = unichar;
--glyphCount;
}
if (++unichar == 0) {
break;
}
}
}
// Construct Glyph to Unicode table.
// Unicode code points that require conjugate pairs in utf16 are not
// supported.
static void populate_glyph_to_unicode(CTFontRef ctFont, CFIndex glyphCount,
SkTDArray<SkUnichar>* glyphToUnicode) {
AutoCFRelease<CFCharacterSetRef> charSet(CTFontCopyCharacterSet(ctFont));
if (!charSet) {
populate_glyph_to_unicode_slow(ctFont, glyphCount, glyphToUnicode);
return;
}
AutoCFRelease<CFDataRef> bitmap(CFCharacterSetCreateBitmapRepresentation(kCFAllocatorDefault,
charSet));
if (!bitmap) {
return;
}
CFIndex length = CFDataGetLength(bitmap);
if (!length) {
return;
}
if (length > 8192) {
// TODO: Add support for Unicode above 0xFFFF
// Consider only the BMP portion of the Unicode character points.
// The bitmap may contain other planes, up to plane 16.
// See http://developer.apple.com/library/ios/#documentation/CoreFoundation/Reference/CFCharacterSetRef/Reference/reference.html
length = 8192;
}
const UInt8* bits = CFDataGetBytePtr(bitmap);
glyphToUnicode->setCount(SkToInt(glyphCount));
SkUnichar* out = glyphToUnicode->begin();
sk_bzero(out, glyphCount * sizeof(SkUnichar));
for (int i = 0; i < length; i++) {
int mask = bits[i];
if (!mask) {
continue;
}
for (int j = 0; j < 8; j++) {
CGGlyph glyph;
UniChar unichar = static_cast<UniChar>((i << 3) + j);
if (mask & (1 << j) && CTFontGetGlyphsForCharacters(ctFont, &unichar, &glyph, 1)) {
out[glyph] = unichar;
}
}
}
}
static bool getWidthAdvance(CTFontRef ctFont, int gId, int16_t* data) {
CGSize advance;
advance.width = 0;
CGGlyph glyph = gId;
CTFontGetAdvancesForGlyphs(ctFont, kCTFontHorizontalOrientation, &glyph, &advance, 1);
*data = sk_float_round2int(advance.width);
return true;
}
/** 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()));
}
SkAdvancedTypefaceMetrics* SkTypeface_Mac::onGetAdvancedTypefaceMetrics(
PerGlyphInfo perGlyphInfo,
const uint32_t* glyphIDs,
uint32_t glyphIDsCount) const {
AUTO_CG_LOCK();
CTFontRef originalCTFont = fFontRef.get();
AutoCFRelease<CTFontRef> ctFont(ctfont_create_exact_copy(
originalCTFont, CTFontGetUnitsPerEm(originalCTFont), nullptr));
SkAdvancedTypefaceMetrics* info = new SkAdvancedTypefaceMetrics;
{
AutoCFRelease<CFStringRef> fontName(CTFontCopyPostScriptName(ctFont));
if (fontName.get()) {
CFStringToSkString(fontName, &info->fFontName);
}
}
CFIndex glyphCount = CTFontGetGlyphCount(ctFont);
info->fLastGlyphID = SkToU16(glyphCount - 1);
info->fEmSize = CTFontGetUnitsPerEm(ctFont);
if (perGlyphInfo & kToUnicode_PerGlyphInfo) {
populate_glyph_to_unicode(ctFont, glyphCount, &info->fGlyphToUnicode);
}
// 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);
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);
info->fAscent = (int16_t) CTFontGetAscent(ctFont);
info->fDescent = (int16_t) CTFontGetDescent(ctFont);
info->fCapHeight = (int16_t) CTFontGetCapHeight(ctFont);
CGRect bbox = CTFontGetBoundingBox(ctFont);
SkRect r;
r.set( 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, stem_chars, glyphs, count)) {
CTFontGetBoundingRectsForGlyphs(ctFont, kCTFontHorizontalOrientation,
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;
}
}
}
if (perGlyphInfo & kHAdvance_PerGlyphInfo) {
if (info->fStyle & SkAdvancedTypefaceMetrics::kFixedPitch_Style) {
skia_advanced_typeface_metrics_utils::appendRange(&info->fGlyphWidths, 0);
info->fGlyphWidths->fAdvance.append(1, &min_width);
skia_advanced_typeface_metrics_utils::finishRange(info->fGlyphWidths.get(), 0,
SkAdvancedTypefaceMetrics::WidthRange::kDefault);
} else {
info->fGlyphWidths.reset(
skia_advanced_typeface_metrics_utils::getAdvanceData(ctFont.get(),
SkToInt(glyphCount),
glyphIDs,
glyphIDsCount,
&getWidthAdvance));
}
}
return info;
}
///////////////////////////////////////////////////////////////////////////////
static SK_SFNT_ULONG get_font_type_tag(const SkTypeface_Mac* typeface) {
CTFontRef ctFont = typeface->fFontRef.get();
AutoCFRelease<CFNumberRef> fontFormatRef(
static_cast<CFNumberRef>(CTFontCopyAttribute(ctFont, kCTFontFormatAttribute)));
if (!fontFormatRef) {
return 0;
}
SInt32 fontFormatValue;
if (!CFNumberGetValue(fontFormatRef, 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:
//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.
return SkSFNTHeader::fontType_WindowsTrueType::TAG;
}
}
SkStreamAsset* SkTypeface_Mac::onOpenStream(int* ttcIndex) const {
SK_SFNT_ULONG fontType = get_font_type_tag(this);
if (0 == fontType) {
return nullptr;
}
// get table tags
int numTables = this->countTables();
SkTDArray<SkFontTableTag> tableTags;
tableTags.setCount(numTables);
this->getTableTags(tableTags.begin());
// calc total size for font, save sizes
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)
SkMemoryStream* stream = new SkMemoryStream(totalSize);
char* dataStart = (char*)stream->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;
}
*ttcIndex = 0;
return stream;
}
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 fFontRef, CFIndex* cgAxisCount,
SkAutoSTMalloc<4, SkFixed>* axisValues)
{
// 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.
AutoCFRelease<CGFontRef> cgFont(CTFontCopyGraphicsFont(fFontRef, nullptr));
AutoCFRelease<CFDictionaryRef> cgVariations(CGFontCopyVariations(cgFont));
// If a font has no variations CGFontCopyVariations returns nullptr (instead of an empty dict).
if (!cgVariations.get()) {
return false;
}
AutoCFRelease<CFArrayRef> cgAxes(CGFontCopyVariationAxes(cgFont));
*cgAxisCount = CFArrayGetCount(cgAxes);
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, 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, set_non_default_axes, &c);
return true;
}
SkFontData* SkTypeface_Mac::onCreateFontData() const {
int index;
SkAutoTDelete<SkStreamAsset> stream(this->onOpenStream(&index));
CFIndex cgAxisCount;
SkAutoSTMalloc<4, SkFixed> axisValues;
if (get_variations(fFontRef, &cgAxisCount, &axisValues)) {
return new SkFontData(stream.detach(), index, axisValues.get(), cgAxisCount);
}
return new SkFontData(stream.detach(), index, nullptr, 0);
}
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
int SkTypeface_Mac::onGetUPEM() const {
AutoCFRelease<CGFontRef> cgFont(CTFontCopyGraphicsFont(fFontRef, nullptr));
return CGFontGetUnitsPerEm(cgFont);
}
SkTypeface::LocalizedStrings* SkTypeface_Mac::onCreateFamilyNameIterator() const {
SkTypeface::LocalizedStrings* nameIter =
SkOTUtils::LocalizedStrings_NameTable::CreateForFamilyNames(*this);
if (nullptr == nameIter) {
AutoCFRelease<CFStringRef> cfLanguage;
AutoCFRelease<CFStringRef> cfFamilyName(
CTFontCopyLocalizedName(fFontRef, kCTFontFamilyNameKey, &cfLanguage));
SkString skLanguage;
SkString skFamilyName;
if (cfLanguage.get()) {
CFStringToSkString(cfLanguage.get(), &skLanguage);
} else {
skLanguage = "und"; //undetermined
}
if (cfFamilyName.get()) {
CFStringToSkString(cfFamilyName.get(), &skFamilyName);
}
nameIter = new SkOTUtils::LocalizedStrings_SingleName(skFamilyName, skLanguage);
}
return nameIter;
}
// 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 CFDataRef copyTableFromFont(CTFontRef ctFont, SkFontTableTag tag) {
CFDataRef data = CTFontCopyTable(ctFont, (CTFontTableTag) tag,
kCTFontTableOptionNoOptions);
if (nullptr == data) {
AutoCFRelease<CGFontRef> cgFont(CTFontCopyGraphicsFont(ctFont, nullptr));
data = CGFontCopyTableForTag(cgFont, tag);
}
return data;
}
int SkTypeface_Mac::onGetTableTags(SkFontTableTag tags[]) const {
AutoCFRelease<CFArrayRef> cfArray(CTFontCopyAvailableTables(fFontRef,
kCTFontTableOptionNoOptions));
if (nullptr == cfArray) {
return 0;
}
int count = SkToInt(CFArrayGetCount(cfArray));
if (tags) {
for (int i = 0; i < count; ++i) {
uintptr_t fontTag = reinterpret_cast<uintptr_t>(CFArrayGetValueAtIndex(cfArray, i));
tags[i] = static_cast<SkFontTableTag>(fontTag);
}
}
return count;
}
size_t SkTypeface_Mac::onGetTableData(SkFontTableTag tag, size_t offset,
size_t length, void* dstData) const {
AutoCFRelease<CFDataRef> srcData(copyTableFromFont(fFontRef, tag));
if (nullptr == srcData) {
return 0;
}
size_t srcSize = CFDataGetLength(srcData);
if (offset >= srcSize) {
return 0;
}
if (length > srcSize - offset) {
length = srcSize - offset;
}
if (dstData) {
memcpy(dstData, CFDataGetBytePtr(srcData) + offset, length);
}
return length;
}
SkScalerContext* SkTypeface_Mac::onCreateScalerContext(const SkDescriptor* desc) const {
return new SkScalerContext_Mac(const_cast<SkTypeface_Mac*>(this), 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(SkPaint::kNormal_Hinting);
}
unsigned flagsWeDontSupport = SkScalerContext::kDevKernText_Flag |
SkScalerContext::kForceAutohinting_Flag |
SkScalerContext::kLCD_BGROrder_Flag |
SkScalerContext::kLCD_Vertical_Flag;
rec->fFlags &= ~flagsWeDontSupport;
bool lcdSupport = supports_LCD();
// Only two levels of hinting are supported.
// kNo_Hinting means avoid CoreGraphics outline dilation.
// kNormal_Hinting means CoreGraphics outline dilation is allowed.
// If there is no lcd support, hinting (dilation) cannot be supported.
SkPaint::Hinting hinting = rec->getHinting();
if (SkPaint::kSlight_Hinting == hinting || !lcdSupport) {
hinting = SkPaint::kNo_Hinting;
} else if (SkPaint::kFull_Hinting == hinting) {
hinting = SkPaint::kNormal_Hinting;
}
rec->setHinting(hinting);
// 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 (isLCDFormat(rec->fMaskFormat)) {
if (lcdSupport) {
//CoreGraphics creates 555 masks for smoothed text anyway.
rec->fMaskFormat = SkMask::kLCD16_Format;
rec->setHinting(SkPaint::kNormal_Hinting);
} else {
rec->fMaskFormat = SkMask::kA8_Format;
}
}
// 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 && SkPaint::kNo_Hinting == hinting) {
#ifndef SK_GAMMA_APPLY_TO_A8
rec->ignorePreBlend();
#endif
} else {
//CoreGraphics dialates smoothed text as needed.
rec->setContrast(0);
}
}
// we take ownership of the ref
static const char* get_str(CFStringRef ref, SkString* str) {
if (nullptr == ref) {
return nullptr;
}
CFStringToSkString(ref, str);
CFSafeRelease(ref);
return str->c_str();
}
void SkTypeface_Mac::onGetFamilyName(SkString* familyName) const {
get_str(CTFontCopyFamilyName(fFontRef), familyName);
}
void SkTypeface_Mac::onGetFontDescriptor(SkFontDescriptor* desc,
bool* isLocalStream) const {
SkString tmpStr;
desc->setFamilyName(get_str(CTFontCopyFamilyName(fFontRef), &tmpStr));
desc->setFullName(get_str(CTFontCopyFullName(fFontRef), &tmpStr));
desc->setPostscriptName(get_str(CTFontCopyPostScriptName(fFontRef), &tmpStr));
*isLocalStream = fIsLocalStream;
}
int SkTypeface_Mac::onCharsToGlyphs(const void* chars, Encoding encoding,
uint16_t glyphs[], int glyphCount) 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;
switch (encoding) {
case kUTF8_Encoding: {
const char* utf8 = reinterpret_cast<const char*>(chars);
UniChar* utf16 = charStorage.reset(2 * glyphCount);
src = utf16;
for (int i = 0; i < glyphCount; ++i) {
SkUnichar uni = SkUTF8_NextUnichar(&utf8);
utf16 += SkUTF16_FromUnichar(uni, utf16);
}
srcCount = SkToInt(utf16 - src);
break;
}
case kUTF16_Encoding: {
src = reinterpret_cast<const UniChar*>(chars);
int extra = 0;
for (int i = 0; i < glyphCount; ++i) {
if (SkUTF16_IsHighSurrogate(src[i + extra])) {
++extra;
}
}
srcCount = glyphCount + extra;
break;
}
case kUTF32_Encoding: {
const SkUnichar* utf32 = reinterpret_cast<const SkUnichar*>(chars);
UniChar* utf16 = charStorage.reset(2 * glyphCount);
src = utf16;
for (int i = 0; i < glyphCount; ++i) {
utf16 += SkUTF16_FromUnichar(utf32[i], utf16);
}
srcCount = SkToInt(utf16 - src);
break;
}
}
// If glyphs is nullptr, CT still needs glyph storage for finding the first failure.
// Also, 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 (nullptr == macGlyphs || srcCount > glyphCount) {
macGlyphs = glyphStorage.reset(srcCount);
}
bool allEncoded = CTFontGetGlyphsForCharacters(fFontRef, src, macGlyphs, srcCount);
// If there were any non-bmp, then copy and compact.
// If 'glyphs' is nullptr, then compact glyphStorage in-place.
// If all are bmp and 'glyphs' is non-nullptr, 'glyphs' already contains the compact glyphs.
// If some are non-bmp and 'glyphs' is non-nullptr, copy and compact into 'glyphs'.
uint16_t* compactedGlyphs = glyphs;
if (nullptr == compactedGlyphs) {
compactedGlyphs = macGlyphs;
}
if (srcCount > glyphCount) {
int extra = 0;
for (int i = 0; i < glyphCount; ++i) {
compactedGlyphs[i] = macGlyphs[i + extra];
if (SkUTF16_IsHighSurrogate(src[i + extra])) {
++extra;
}
}
}
if (allEncoded) {
return glyphCount;
}
// If we got false, then we need to manually look for first failure.
for (int i = 0; i < glyphCount; ++i) {
if (0 == compactedGlyphs[i]) {
return i;
}
}
// Odd to get here, as we expected CT to have returned true up front.
return glyphCount;
}
int SkTypeface_Mac::onCountGlyphs() const {
return SkToInt(CTFontGetGlyphCount(fFontRef));
}
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
static bool find_desc_str(CTFontDescriptorRef desc, CFStringRef name, SkString* value) {
AutoCFRelease<CFStringRef> ref((CFStringRef)CTFontDescriptorCopyAttribute(desc, name));
if (nullptr == ref.get()) {
return false;
}
CFStringToSkString(ref, value);
return true;
}
#include "SkFontMgr.h"
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.isItalic() != b.isItalic()) * 900);
}
static SkTypeface* createFromDesc(CFStringRef cfFamilyName, CTFontDescriptorRef desc) {
NameStyle cacheRequest;
SkString skFamilyName;
CFStringToSkString(cfFamilyName, &skFamilyName);
cacheRequest.fName = skFamilyName.c_str();
cacheRequest.fStyle = fontstyle_from_descriptor(desc);
SkTypeface* face = SkTypefaceCache::FindByProcAndRef(find_by_NameStyle, &cacheRequest);
if (face) {
return face;
}
AutoCFRelease<CTFontRef> ctFont(CTFontCreateWithFontDescriptor(desc, 0, nullptr));
if (!ctFont) {
return nullptr;
}
bool isFixedPitch;
(void)computeStyleBits(ctFont, &isFixedPitch);
face = new SkTypeface_Mac(ctFont.detach(), nullptr, cacheRequest.fStyle, isFixedPitch,
skFamilyName.c_str(), false);
SkTypefaceCache::Add(face, face->fontStyle());
return face;
}
class SkFontStyleSet_Mac : public SkFontStyleSet {
public:
SkFontStyleSet_Mac(CFStringRef familyName, CTFontDescriptorRef desc)
: fArray(CTFontDescriptorCreateMatchingFontDescriptors(desc, nullptr))
, fFamilyName(familyName)
, fCount(0) {
CFRetain(familyName);
if (nullptr == fArray) {
fArray = CFArrayCreate(nullptr, nullptr, 0, nullptr);
}
fCount = SkToInt(CFArrayGetCount(fArray));
}
virtual ~SkFontStyleSet_Mac() {
CFRelease(fArray);
CFRelease(fFamilyName);
}
int count() override {
return fCount;
}
void getStyle(int index, SkFontStyle* style, SkString* name) override {
SkASSERT((unsigned)index < (unsigned)fCount);
CTFontDescriptorRef desc = (CTFontDescriptorRef)CFArrayGetValueAtIndex(fArray, index);
if (style) {
*style = fontstyle_from_descriptor(desc);
}
if (name) {
if (!find_desc_str(desc, kCTFontStyleNameAttribute, name)) {
name->reset();
}
}
}
SkTypeface* createTypeface(int index) override {
SkASSERT((unsigned)index < (unsigned)CFArrayGetCount(fArray));
CTFontDescriptorRef desc = (CTFontDescriptorRef)CFArrayGetValueAtIndex(fArray, index);
return createFromDesc(fFamilyName, desc);
}
SkTypeface* matchStyle(const SkFontStyle& pattern) override {
if (0 == fCount) {
return nullptr;
}
return createFromDesc(fFamilyName, findMatchingDesc(pattern));
}
private:
CFArrayRef fArray;
CFStringRef fFamilyName;
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, i);
int metric = compute_metric(pattern, fontstyle_from_descriptor(desc));
if (0 == metric) {
return desc;
}
if (metric < bestMetric) {
bestMetric = metric;
bestDesc = desc;
}
}
SkASSERT(bestDesc);
return bestDesc;
}
};
class SkFontMgr_Mac : public SkFontMgr {
CFArrayRef fNames;
int fCount;
CFStringRef stringAt(int index) const {
SkASSERT((unsigned)index < (unsigned)fCount);
return (CFStringRef)CFArrayGetValueAtIndex(fNames, index);
}
static SkFontStyleSet* CreateSet(CFStringRef cfFamilyName) {
AutoCFRelease<CFMutableDictionaryRef> cfAttr(
CFDictionaryCreateMutable(kCFAllocatorDefault, 0,
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks));
CFDictionaryAddValue(cfAttr, kCTFontFamilyNameAttribute, cfFamilyName);
AutoCFRelease<CTFontDescriptorRef> desc(
CTFontDescriptorCreateWithAttributes(cfAttr));
return new SkFontStyleSet_Mac(cfFamilyName, desc);
}
public:
SkFontMgr_Mac()
: fNames(SkCTFontManagerCopyAvailableFontFamilyNames())
, fCount(fNames ? SkToInt(CFArrayGetCount(fNames)) : 0) {}
virtual ~SkFontMgr_Mac() {
CFSafeRelease(fNames);
}
protected:
int onCountFamilies() const override {
return fCount;
}
void onGetFamilyName(int index, SkString* familyName) const override {
if ((unsigned)index < (unsigned)fCount) {
CFStringToSkString(this->stringAt(index), familyName);
} else {
familyName->reset();
}
}
SkFontStyleSet* onCreateStyleSet(int index) const override {
if ((unsigned)index >= (unsigned)fCount) {
return nullptr;
}
return CreateSet(this->stringAt(index));
}
SkFontStyleSet* onMatchFamily(const char familyName[]) const override {
AutoCFRelease<CFStringRef> cfName(make_CFString(familyName));
return CreateSet(cfName);
}
virtual SkTypeface* onMatchFamilyStyle(const char familyName[],
const SkFontStyle&) const override {
return nullptr;
}
virtual SkTypeface* onMatchFamilyStyleCharacter(const char familyName[], const SkFontStyle&,
const char* bcp47[], int bcp47Count,
SkUnichar character) const override {
return nullptr;
}
virtual SkTypeface* onMatchFaceStyle(const SkTypeface* familyMember,
const SkFontStyle&) const override {
return nullptr;
}
SkTypeface* onCreateFromData(SkData* data, int ttcIndex) const override {
AutoCFRelease<CGDataProviderRef> pr(SkCreateDataProviderFromData(data));
if (nullptr == pr) {
return nullptr;
}
return create_from_dataProvider(pr);
}
SkTypeface* onCreateFromStream(SkStreamAsset* stream, int ttcIndex) const override {
AutoCFRelease<CGDataProviderRef> pr(SkCreateDataProviderFromStream(stream));
if (nullptr == pr) {
return nullptr;
}
return create_from_dataProvider(pr);
}
static CFDictionaryRef get_axes(CGFontRef cg, SkFontData* fontData) {
AutoCFRelease<CFArrayRef> cgAxes(CGFontCopyVariationAxes(cg));
if (!cgAxes) {
return nullptr;
}
CFIndex axisCount = CFArrayGetCount(cgAxes);
if (0 == axisCount || axisCount != fontData->getAxisCount()) {
return nullptr;
}
CFMutableDictionaryRef dict = CFDictionaryCreateMutable(kCFAllocatorDefault, axisCount,
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
for (int i = 0; i < fontData->getAxisCount(); ++i) {
CFTypeRef axisInfo = CFArrayGetValueAtIndex(cgAxes, i);
if (CFDictionaryGetTypeID() != CFGetTypeID(axisInfo)) {
return nullptr;
}
CFDictionaryRef axisInfoDict = static_cast<CFDictionaryRef>(axisInfo);
CFTypeRef axisName = CFDictionaryGetValue(axisInfoDict, kCGFontVariationAxisName);
if (!axisName || CFGetTypeID(axisName) != CFStringGetTypeID()) {
return nullptr;
}
// The variation axes can be set to any value, but cg will effectively pin them.
// Pin them here to normalize.
CFTypeRef min = CFDictionaryGetValue(axisInfoDict, kCGFontVariationAxisMinValue);
CFTypeRef max = CFDictionaryGetValue(axisInfoDict, kCGFontVariationAxisMaxValue);
if (!min || CFGetTypeID(min) != CFNumberGetTypeID() ||
!max || CFGetTypeID(max) != CFNumberGetTypeID())
{
return nullptr;
}
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 nullptr;
}
double value = SkTPin(SkFixedToDouble(fontData->getAxis()[i]), minDouble, maxDouble);
CFNumberRef valueNumber = CFNumberCreate(kCFAllocatorDefault, kCFNumberDoubleType,
&value);
CFDictionaryAddValue(dict, axisName, valueNumber);
CFRelease(valueNumber);
}
return dict;
}
SkTypeface* onCreateFromFontData(SkFontData* data) const override {
SkAutoTDelete<SkFontData> fontData(data);
SkStreamAsset* stream = fontData->detachStream();
AutoCFRelease<CGDataProviderRef> provider(SkCreateDataProviderFromStream(stream));
if (nullptr == provider) {
return nullptr;
}
AutoCFRelease<CGFontRef> cg(CGFontCreateWithDataProvider(provider));
if (nullptr == cg) {
return nullptr;
}
AutoCFRelease<CFDictionaryRef> cgVariations(get_axes(cg, fontData));
// The CGFontRef returned by CGFontCreateCopyWithVariations when the passed CGFontRef was
// created from a data provider does not appear to have any ownership of the underlying
// data. The original CGFontRef must be kept alive until the copy will no longer be used.
AutoCFRelease<CGFontRef> cgVariant;
if (cgVariations) {
cgVariant.reset(CGFontCreateCopyWithVariations(cg, cgVariations));
} else {
cgVariant.reset(cg.detach());
}
CTFontRef ct = CTFontCreateWithGraphicsFont(cgVariant, 0, nullptr, nullptr);
if (!ct) {
return nullptr;
}
return NewFromFontRef(ct, cg.detach(), nullptr, true);
}
SkTypeface* onCreateFromFile(const char path[], int ttcIndex) const override {
AutoCFRelease<CGDataProviderRef> pr(CGDataProviderCreateWithFilename(path));
if (nullptr == pr) {
return nullptr;
}
return create_from_dataProvider(pr);
}
virtual SkTypeface* onLegacyCreateTypeface(const char familyName[],
unsigned styleBits) const override {
SkFontStyle style = SkFontStyle((SkTypeface::Style)styleBits);
if (familyName) {
familyName = map_css_names(familyName);
}
if (!familyName || !*familyName) {
familyName = FONT_DEFAULT_NAME;
}
NameStyle cacheRequest = { familyName, style };
SkTypeface* face = SkTypefaceCache::FindByProcAndRef(find_by_NameStyle, &cacheRequest);
if (nullptr == face) {
face = NewFromName(familyName, style);
if (face) {
SkTypefaceCache::Add(face, style);
} else {
face = GetDefaultFace();
face->ref();
}
}
return face;
}
};
///////////////////////////////////////////////////////////////////////////////
SkFontMgr* SkFontMgr::Factory() { return new SkFontMgr_Mac; }
#endif//defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_IOS)