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ara-mdk / platform / external / skia / d686ac77c2c485c4a3302eda9c1de597a6f8c568 / . / src / ports / SkFontHost_mac_coretext.cpp
blob: ceb9a040c85d55a92639098f1cf5bd69a113b98b [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 <vector>
#ifdef SK_BUILD_FOR_MAC
#import <ApplicationServices/ApplicationServices.h>
#endif
#ifdef SK_BUILD_FOR_IOS
#include <CoreText/CoreText.h>
#include <CoreGraphics/CoreGraphics.h>
#include <CoreFoundation/CoreFoundation.h>
#endif
#include "SkFontHost.h"
#include "SkCGUtils.h"
#include "SkColorPriv.h"
#include "SkDescriptor.h"
#include "SkEndian.h"
#include "SkFontDescriptor.h"
#include "SkFloatingPoint.h"
#include "SkGlyph.h"
#include "SkMaskGamma.h"
#include "SkSFNTHeader.h"
#include "SkOTTable_glyf.h"
#include "SkOTTable_head.h"
#include "SkOTTable_hhea.h"
#include "SkOTTable_loca.h"
#include "SkOTUtils.h"
#include "SkPaint.h"
#include "SkPath.h"
#include "SkString.h"
#include "SkStream.h"
#include "SkThread.h"
#include "SkTypeface_mac.h"
#include "SkUtils.h"
#include "SkTypefaceCache.h"
class SkScalerContext_Mac;
// 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 = NULL) : fCFRef(cfRef) { }
~AutoCFRelease() { CFSafeRelease(fCFRef); }
void reset(CFRef that = NULL) {
CFSafeRetain(that);
CFSafeRelease(fCFRef);
fCFRef = that;
}
AutoCFRelease& operator =(CFRef that) {
reset(that);
return *this;
}
operator CFRef() const { return fCFRef; }
CFRef get() const { return fCFRef; }
private:
CFRef fCFRef;
};
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)) : NULL)
{ }
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 void CGRectInset_inline(CGRect* rect, CGFloat dx, CGFloat dy) {
rect->origin.x += dx;
rect->origin.y += dy;
rect->size.width -= dx * 2;
rect->size.height -= dy * 2;
}
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,
size_t width, size_t 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;
}
// The calls to support subpixel are present in 10.5, but are not included in
// the 10.5 SDK. The needed calls have been extracted from the 10.6 SDK and are
// included below. To verify that CGContextSetShouldSubpixelQuantizeFonts, for
// instance, is present in the 10.5 CoreGraphics libary, use:
// cd /Developer/SDKs/MacOSX10.5.sdk/System/Library/Frameworks/
// cd ApplicationServices.framework/Frameworks/CoreGraphics.framework/
// nm CoreGraphics | grep CGContextSetShouldSubpixelQuantizeFonts
#if !defined(MAC_OS_X_VERSION_10_6) || (MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_6)
CG_EXTERN void CGContextSetAllowsFontSmoothing(CGContextRef context, bool value);
CG_EXTERN void CGContextSetAllowsFontSubpixelPositioning(CGContextRef context, bool value);
CG_EXTERN void CGContextSetShouldSubpixelPositionFonts(CGContextRef context, bool value);
CG_EXTERN void CGContextSetAllowsFontSubpixelQuantization(CGContextRef context, bool value);
CG_EXTERN void CGContextSetShouldSubpixelQuantizeFonts(CGContextRef context, bool value);
#endif
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 isLeopard() {
return darwinVersion() == 9;
}
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 || SkMask::kLCD32_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 SkFloatToScalar(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));
}
static SkScalar getFontScale(CGFontRef cgFont) {
int unitsPerEm = CGFontGetUnitsPerEm(cgFont);
return SkScalarInvert(SkIntToScalar(unitsPerEm));
}
///////////////////////////////////////////////////////////////////////////////
#define BITMAP_INFO_RGB (kCGImageAlphaNoneSkipFirst | kCGBitmapByteOrder32Host)
#define BITMAP_INFO_GRAY (kCGImageAlphaNone)
/**
* 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();
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);
}
};
Offscreen::Offscreen() : fRGBSpace(NULL), fCG(NULL) {
fSize.set(0, 0);
}
///////////////////////////////////////////////////////////////////////////////
static SkTypeface::Style computeStyleBits(CTFontRef font, bool* isMonospace) {
unsigned style = SkTypeface::kNormal;
CTFontSymbolicTraits traits = CTFontGetSymbolicTraits(font);
if (traits & kCTFontBoldTrait) {
style |= SkTypeface::kBold;
}
if (traits & kCTFontItalicTrait) {
style |= SkTypeface::kItalic;
}
if (isMonospace) {
*isMonospace = (traits & kCTFontMonoSpaceTrait) != 0;
}
return (SkTypeface::Style)style;
}
static SkFontID CTFontRef_to_SkFontID(CTFontRef fontRef) {
SkFontID id = 0;
// CTFontGetPlatformFont and ATSFontRef are not supported on iOS, so we have to
// bracket this to be Mac only.
#ifdef SK_BUILD_FOR_MAC
ATSFontRef ats = CTFontGetPlatformFont(fontRef, NULL);
id = (SkFontID)ats;
if (id != 0) {
id &= 0x3FFFFFFF; // make top two bits 00
return id;
}
#endif
// CTFontGetPlatformFont returns NULL if the font is local
// (e.g., was created by a CSS3 @font-face rule).
AutoCFRelease<CGFontRef> cgFont(CTFontCopyGraphicsFont(fontRef, NULL));
AutoCGTable<SkOTTableHead> headTable(cgFont);
if (headTable.fData) {
id = (SkFontID) headTable->checksumAdjustment;
id = (id & 0x3FFFFFFF) | 0x40000000; // make top two bits 01
}
// well-formed fonts have checksums, but as a last resort, use the pointer.
if (id == 0) {
id = (SkFontID) (uintptr_t) fontRef;
id = (id & 0x3FFFFFFF) | 0x80000000; // make top two bits 10
}
return id;
}
class SkTypeface_Mac : public SkTypeface {
public:
SkTypeface_Mac(SkTypeface::Style style, SkFontID fontID, bool isMonospace,
CTFontRef fontRef, const char name[])
: SkTypeface(style, fontID, isMonospace)
, fName(name)
, fFontRef(fontRef) // caller has already called CFRetain for us
{
SkASSERT(fontRef);
}
SkString fName;
AutoCFRelease<CTFontRef> fFontRef;
};
static CTFontRef typeface_to_fontref(const SkTypeface* face) {
const SkTypeface_Mac* macface = reinterpret_cast<const SkTypeface_Mac*>(face);
return macface->fFontRef;
}
static SkTypeface* NewFromFontRef(CTFontRef fontRef, const char name[]) {
SkASSERT(fontRef);
bool isMonospace;
SkTypeface::Style style = computeStyleBits(fontRef, &isMonospace);
SkFontID fontID = CTFontRef_to_SkFontID(fontRef);
return new SkTypeface_Mac(style, fontID, isMonospace, fontRef, name);
}
static SkTypeface* NewFromName(const char familyName[], SkTypeface::Style theStyle) {
CTFontRef ctFont = NULL;
CTFontSymbolicTraits ctFontTraits = 0;
if (theStyle & SkTypeface::kBold) {
ctFontTraits |= kCTFontBoldTrait;
}
if (theStyle & SkTypeface::kItalic) {
ctFontTraits |= kCTFontItalicTrait;
}
// Create the font info
AutoCFRelease<CFStringRef> cfFontName(
CFStringCreateWithCString(NULL, familyName, kCFStringEncodingUTF8));
AutoCFRelease<CFNumberRef> cfFontTraits(
CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &ctFontTraits));
AutoCFRelease<CFMutableDictionaryRef> cfAttributes(
CFDictionaryCreateMutable(kCFAllocatorDefault, 0,
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks));
AutoCFRelease<CFMutableDictionaryRef> cfTraits(
CFDictionaryCreateMutable(kCFAllocatorDefault, 0,
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks));
// Create the font
if (cfFontName != NULL && cfFontTraits != NULL && cfAttributes != NULL && cfTraits != NULL) {
CFDictionaryAddValue(cfTraits, kCTFontSymbolicTrait, cfFontTraits);
CFDictionaryAddValue(cfAttributes, kCTFontFamilyNameAttribute, cfFontName);
CFDictionaryAddValue(cfAttributes, kCTFontTraitsAttribute, cfTraits);
AutoCFRelease<CTFontDescriptorRef> ctFontDesc(
CTFontDescriptorCreateWithAttributes(cfAttributes));
if (ctFontDesc != NULL) {
if (isLeopard()) {
// CTFontCreateWithFontDescriptor on Leopard ignores the name
AutoCFRelease<CTFontRef> ctNamed(CTFontCreateWithName(cfFontName, 1, NULL));
ctFont = CTFontCreateCopyWithAttributes(ctNamed, 1, NULL, ctFontDesc);
} else {
ctFont = CTFontCreateWithFontDescriptor(ctFontDesc, 0, NULL);
}
}
}
return ctFont ? NewFromFontRef(ctFont, familyName) : NULL;
}
static CTFontRef GetFontRefFromFontID(SkFontID fontID) {
SkTypeface_Mac* face = reinterpret_cast<SkTypeface_Mac*>(SkTypefaceCache::FindByID(fontID));
return face ? face->fFontRef.get() : NULL;
}
static SkTypeface* GetDefaultFace() {
SK_DECLARE_STATIC_MUTEX(gMutex);
SkAutoMutexAcquire ma(gMutex);
static SkTypeface* gDefaultFace;
if (NULL == gDefaultFace) {
gDefaultFace = NewFromName(FONT_DEFAULT_NAME, SkTypeface::kNormal);
SkTypefaceCache::Add(gDefaultFace, SkTypeface::kNormal);
}
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() : NULL;
}
/* 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) {
SkFontID fontID = CTFontRef_to_SkFontID(fontRef);
SkTypeface* face = SkTypefaceCache::FindByID(fontID);
if (face) {
face->ref();
} else {
face = NewFromFontRef(fontRef, NULL);
SkTypefaceCache::Add(face, face->style());
// NewFromFontRef doesn't retain the parameter, but the typeface it
// creates does release it in its destructor, so we balance that with
// a retain call here.
CFRetain(fontRef);
}
SkASSERT(face->getRefCnt() > 1);
return face;
}
struct NameStyleRec {
const char* fName;
SkTypeface::Style fStyle;
};
static bool FindByNameStyle(SkTypeface* face, SkTypeface::Style style,
void* ctx) {
const SkTypeface_Mac* mface = reinterpret_cast<SkTypeface_Mac*>(face);
const NameStyleRec* rec = reinterpret_cast<const NameStyleRec*>(ctx);
return rec->fStyle == style && mface->fName.equals(rec->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
}
SkTypeface* SkFontHost::CreateTypeface(const SkTypeface* familyFace,
const char familyName[],
SkTypeface::Style style) {
if (familyName) {
familyName = map_css_names(familyName);
}
// Clone an existing typeface
// TODO: only clone if style matches the familyFace's style...
if (familyName == NULL && familyFace != NULL) {
familyFace->ref();
return const_cast<SkTypeface*>(familyFace);
}
if (!familyName || !*familyName) {
familyName = FONT_DEFAULT_NAME;
}
NameStyleRec rec = { familyName, style };
SkTypeface* face = SkTypefaceCache::FindByProcAndRef(FindByNameStyle, &rec);
if (NULL == face) {
face = NewFromName(familyName, style);
if (face) {
SkTypefaceCache::Add(face, style);
} else {
face = GetDefaultFace();
face->ref();
}
}
return face;
}
static void flip(SkMatrix* matrix) {
matrix->setSkewX(-matrix->getSkewX());
matrix->setSkewY(-matrix->getSkewY());
}
///////////////////////////////////////////////////////////////////////////////
struct GlyphRect {
int16_t fMinX;
int16_t fMinY;
int16_t fMaxX;
int16_t fMaxY;
};
class SkScalerContext_Mac : public SkScalerContext {
public:
SkScalerContext_Mac(const SkDescriptor* desc);
virtual ~SkScalerContext_Mac(void);
protected:
unsigned generateGlyphCount(void) SK_OVERRIDE;
uint16_t generateCharToGlyph(SkUnichar uni) SK_OVERRIDE;
void generateAdvance(SkGlyph* glyph) SK_OVERRIDE;
void generateMetrics(SkGlyph* glyph) SK_OVERRIDE;
void generateImage(const SkGlyph& glyph) SK_OVERRIDE;
void generatePath(const SkGlyph& glyph, SkPath* path) SK_OVERRIDE;
void generateFontMetrics(SkPaint::FontMetrics* mX, SkPaint::FontMetrics* mY) SK_OVERRIDE;
private:
static void CTPathElement(void *info, const CGPathElement *element);
uint16_t getFBoundingBoxesGlyphOffset();
void getVerticalOffset(CGGlyph glyphID, SkIPoint* offset) const;
bool generateBBoxes();
CGAffineTransform fTransform;
SkMatrix fUnitMatrix; // without font size
SkMatrix fVerticalMatrix; // unit rotated
SkMatrix fMatrix; // with font size
SkMatrix fFBoundingBoxesMatrix; // lion-specific fix
Offscreen fOffscreen;
AutoCFRelease<CTFontRef> fCTFont;
AutoCFRelease<CTFontRef> fCTVerticalFont; // for vertical advance
AutoCFRelease<CGFontRef> fCGFont;
GlyphRect* fFBoundingBoxes;
uint16_t fFBoundingBoxesGlyphOffset;
uint16_t fGlyphCount;
bool fGeneratedFBoundingBoxes;
bool fDoSubPosition;
bool fVertical;
friend class Offscreen;
};
SkScalerContext_Mac::SkScalerContext_Mac(const SkDescriptor* desc)
: SkScalerContext(desc)
, fFBoundingBoxes(NULL)
, fFBoundingBoxesGlyphOffset(0)
, fGeneratedFBoundingBoxes(false)
{
CTFontRef ctFont = GetFontRefFromFontID(fRec.fFontID);
CFIndex numGlyphs = CTFontGetGlyphCount(ctFont);
// Get the state we need
fRec.getSingleMatrix(&fMatrix);
fUnitMatrix = fMatrix;
// extract the font size out of the matrix, but leave the skewing for italic
SkScalar reciprocal = SkScalarInvert(fRec.fTextSize);
fUnitMatrix.preScale(reciprocal, reciprocal);
SkASSERT(numGlyphs >= 1 && numGlyphs <= 0xFFFF);
fTransform = MatrixToCGAffineTransform(fMatrix);
CGAffineTransform transform;
CGFloat unitFontSize;
if (isLeopard()) {
// passing 1 for pointSize to Leopard sets the font size to 1 pt.
// pass the CoreText size explicitly
transform = MatrixToCGAffineTransform(fUnitMatrix);
unitFontSize = SkScalarToFloat(fRec.fTextSize);
} else {
// since our matrix includes everything, we pass 1 for pointSize
transform = fTransform;
unitFontSize = 1;
}
flip(&fUnitMatrix); // flip to fix up bounds later
fVertical = SkToBool(fRec.fFlags & kVertical_Flag);
AutoCFRelease<CTFontDescriptorRef> ctFontDesc;
if (fVertical) {
AutoCFRelease<CFMutableDictionaryRef> cfAttributes(CFDictionaryCreateMutable(
kCFAllocatorDefault, 0,
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks));
if (cfAttributes) {
CTFontOrientation ctOrientation = kCTFontVerticalOrientation;
AutoCFRelease<CFNumberRef> cfVertical(CFNumberCreate(
kCFAllocatorDefault, kCFNumberSInt32Type, &ctOrientation));
CFDictionaryAddValue(cfAttributes, kCTFontOrientationAttribute, cfVertical);
ctFontDesc = CTFontDescriptorCreateWithAttributes(cfAttributes);
}
}
fCTFont = CTFontCreateCopyWithAttributes(ctFont, unitFontSize, &transform, ctFontDesc);
fCGFont = CTFontCopyGraphicsFont(fCTFont, NULL);
if (fVertical) {
CGAffineTransform rotateLeft = CGAffineTransformMake(0, -1, 1, 0, 0, 0);
transform = CGAffineTransformConcat(rotateLeft, transform);
fCTVerticalFont = CTFontCreateCopyWithAttributes(ctFont, unitFontSize, &transform, NULL);
fVerticalMatrix = fUnitMatrix;
if (isSnowLeopard()) {
SkScalar scale = SkScalarMul(fRec.fTextSize, getFontScale(fCGFont));
fVerticalMatrix.preScale(scale, scale);
} else {
fVerticalMatrix.preRotate(SkIntToScalar(90));
}
fVerticalMatrix.postScale(SK_Scalar1, -SK_Scalar1);
}
fGlyphCount = SkToU16(numGlyphs);
fDoSubPosition = SkToBool(fRec.fFlags & kSubpixelPositioning_Flag);
}
SkScalerContext_Mac::~SkScalerContext_Mac() {
delete[] fFBoundingBoxes;
}
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 smoothed text is always g=2.0.
fRGBSpace = 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;
}
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);
fCG = CGBitmapContextCreate(image, fSize.fWidth, fSize.fHeight, 8,
rowBytes, fRGBSpace, BITMAP_INFO_RGB);
// skia handles quantization itself, so we disable this for cg to get
// full fractional data from them.
CGContextSetAllowsFontSubpixelQuantization(fCG, false);
CGContextSetShouldSubpixelQuantizeFonts(fCG, false);
CGContextSetTextDrawingMode(fCG, kCGTextFill);
CGContextSetFont(fCG, context.fCGFont);
CGContextSetFontSize(fCG, 1);
CGContextSetTextMatrix(fCG, context.fTransform);
CGContextSetAllowsFontSubpixelPositioning(fCG, context.fDoSubPosition);
CGContextSetShouldSubpixelPositionFonts(fCG, context.fDoSubPosition);
// 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 (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());
}
if (context.fVertical) {
SkIPoint offset;
context.getVerticalOffset(glyphID, &offset);
subX += offset.fX;
subY += offset.fY;
}
CGContextShowGlyphsAtPoint(fCG, -glyph.fLeft + subX,
glyph.fTop + glyph.fHeight - subY,
&glyphID, 1);
SkASSERT(rowBytesPtr);
*rowBytesPtr = rowBytes;
return image;
}
void SkScalerContext_Mac::getVerticalOffset(CGGlyph glyphID, SkIPoint* offset) const {
CGSize vertOffset;
CTFontGetVerticalTranslationsForGlyphs(fCTVerticalFont, &glyphID, &vertOffset, 1);
const SkPoint trans = {CGToScalar(vertOffset.width),
CGToScalar(vertOffset.height)};
SkPoint floatOffset;
fVerticalMatrix.mapPoints(&floatOffset, &trans, 1);
if (!isSnowLeopard()) {
// SnowLeopard fails to apply the font's matrix to the vertical metrics,
// but Lion and Leopard do. The unit matrix describes the font's matrix at
// point size 1. There may be some way to avoid mapping here by setting up
// fVerticalMatrix differently, but this works for now.
fUnitMatrix.mapPoints(&floatOffset, 1);
}
offset->fX = SkScalarRound(floatOffset.fX);
offset->fY = SkScalarRound(floatOffset.fY);
}
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;
}
/*
* Lion has a bug in CTFontGetBoundingRectsForGlyphs which returns a bad value
* in theBounds.origin.x for fonts whose numOfLogHorMetrics is less than its
* glyph count. This workaround reads the glyph bounds from the font directly.
*
* The table is computed only if the font is a TrueType font, if the glyph
* value is >= fFBoundingBoxesGlyphOffset. (called only if fFBoundingBoxesGlyphOffset < fGlyphCount).
*
* TODO: A future optimization will compute fFBoundingBoxes once per CGFont, and
* compute fFBoundingBoxesMatrix once per font context.
*/
bool SkScalerContext_Mac::generateBBoxes() {
if (fGeneratedFBoundingBoxes) {
return NULL != fFBoundingBoxes;
}
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 = new GlyphRect[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);
}
fFBoundingBoxesMatrix = fMatrix;
flip(&fFBoundingBoxesMatrix);
SkScalar fontScale = getFontScale(fCGFont);
fFBoundingBoxesMatrix.preScale(fontScale, fontScale);
return true;
}
unsigned SkScalerContext_Mac::generateGlyphCount(void) {
return fGlyphCount;
}
uint16_t SkScalerContext_Mac::generateCharToGlyph(SkUnichar uni) {
CGGlyph cgGlyph;
UniChar theChar;
// Validate our parameters and state
SkASSERT(uni <= 0x0000FFFF);
SkASSERT(sizeof(CGGlyph) <= sizeof(uint16_t));
// Get the glyph
theChar = (UniChar) uni;
if (!CTFontGetGlyphsForCharacters(fCTFont, &theChar, &cgGlyph, 1)) {
cgGlyph = 0;
}
return cgGlyph;
}
void SkScalerContext_Mac::generateAdvance(SkGlyph* glyph) {
this->generateMetrics(glyph);
}
void SkScalerContext_Mac::generateMetrics(SkGlyph* glyph) {
CGSize advance;
CGRect bounds;
CGGlyph cgGlyph;
// Get the state we need
cgGlyph = (CGGlyph) glyph->getGlyphID(fBaseGlyphCount);
if (fVertical) {
if (!isSnowLeopard()) {
// Lion and Leopard respect the vertical font metrics.
CTFontGetBoundingRectsForGlyphs(fCTVerticalFont, kCTFontVerticalOrientation,
&cgGlyph, &bounds, 1);
} else {
// Snow Leopard and earlier respect the vertical font metrics for
// advances, but not bounds, so use the default box and adjust it below.
CTFontGetBoundingRectsForGlyphs(fCTFont, kCTFontDefaultOrientation,
&cgGlyph, &bounds, 1);
}
CTFontGetAdvancesForGlyphs(fCTVerticalFont, kCTFontVerticalOrientation,
&cgGlyph, &advance, 1);
} else {
CTFontGetBoundingRectsForGlyphs(fCTFont, kCTFontDefaultOrientation,
&cgGlyph, &bounds, 1);
CTFontGetAdvancesForGlyphs(fCTFont, kCTFontDefaultOrientation,
&cgGlyph, &advance, 1);
}
// 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 == advance.width && 0 == advance.height) {
AutoCFRelease<CGPathRef> path(CTFontCreatePathForGlyph(fCTFont, cgGlyph, NULL));
if (NULL == path || CGPathIsEmpty(path)) {
bounds = CGRectMake(0, 0, 0, 0);
}
}
glyph->zeroMetrics();
glyph->fAdvanceX = SkFloatToFixed_Check(advance.width);
glyph->fAdvanceY = -SkFloatToFixed_Check(advance.height);
if (CGRectIsEmpty_inline(bounds)) {
return;
}
if (isLeopard() && !fVertical) {
// Leopard does not consider the matrix skew in its bounds.
// Run the bounding rectangle through the skew matrix to determine
// the true bounds. However, this doesn't work if the font is vertical.
// FIXME (Leopard): If the font has synthetic italic (e.g., matrix skew)
// and the font is vertical, the bounds need to be recomputed.
SkRect glyphBounds = SkRect::MakeXYWH(
bounds.origin.x, bounds.origin.y,
bounds.size.width, bounds.size.height);
fUnitMatrix.mapRect(&glyphBounds);
bounds.origin.x = glyphBounds.fLeft;
bounds.origin.y = glyphBounds.fTop;
bounds.size.width = glyphBounds.width();
bounds.size.height = glyphBounds.height();
}
// Adjust the bounds
//
// CTFontGetBoundingRectsForGlyphs ignores the font transform, so we need
// to transform the bounding box ourselves.
//
// The bounds are also expanded by 1 pixel, to give CG room for anti-aliasing.
CGRectInset_inline(&bounds, -1, -1);
// Get the metrics
bool lionAdjustedMetrics = false;
if (isLion() || isMountainLion()) {
if (cgGlyph < fGlyphCount && cgGlyph >= getFBoundingBoxesGlyphOffset() && generateBBoxes()){
lionAdjustedMetrics = true;
SkRect adjust;
const GlyphRect& gRect = fFBoundingBoxes[cgGlyph - fFBoundingBoxesGlyphOffset];
adjust.set(gRect.fMinX, gRect.fMinY, gRect.fMaxX, gRect.fMaxY);
fFBoundingBoxesMatrix.mapRect(&adjust);
bounds.origin.x = SkScalarToFloat(adjust.fLeft) - 1;
bounds.origin.y = SkScalarToFloat(adjust.fTop) - 1;
}
// Lion returns fractions in the bounds
glyph->fWidth = SkToU16(sk_float_ceil2int(bounds.size.width));
glyph->fHeight = SkToU16(sk_float_ceil2int(bounds.size.height));
} else {
glyph->fWidth = SkToU16(sk_float_round2int(bounds.size.width));
glyph->fHeight = SkToU16(sk_float_round2int(bounds.size.height));
}
glyph->fTop = SkToS16(-sk_float_round2int(CGRectGetMaxY_inline(bounds)));
glyph->fLeft = SkToS16(sk_float_round2int(CGRectGetMinX_inline(bounds)));
SkIPoint offset;
if (fVertical && (isSnowLeopard() || lionAdjustedMetrics)) {
// SnowLeopard doesn't respect vertical metrics, so compute them manually.
// Also compute them for Lion when the metrics were computed by hand.
getVerticalOffset(cgGlyph, &offset);
glyph->fLeft += offset.fX;
glyph->fTop += offset.fY;
}
}
#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(SkFloatToScalar(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;
return sk_apply_lut_if<APPLY_PREBLEND>(SkComputeLuminance(r, g, b), table8);
}
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);
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);
}
}
template<bool APPLY_PREBLEND>
static inline uint32_t rgb_to_lcd32(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);
return SkPackARGB32(0xFF, r, g, b);
}
template<bool APPLY_PREBLEND>
static void rgb_to_lcd32(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();
uint32_t* SK_RESTRICT dst = (uint32_t*)glyph.fImage;
for (int y = 0; y < glyph.fHeight; y++) {
for (int i = 0; i < width; i++) {
dst[i] = rgb_to_lcd32<APPLY_PREBLEND>(cgPixels[i], tableR, tableG, tableB);
}
cgPixels = (CGRGBPixel*)((char*)cgPixels + cgRowBytes);
dst = (uint32_t*)((char*)dst + dstRB);
}
}
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(fBaseGlyphCount);
// 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 == NULL) {
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::kLCD32_Format: {
if (fPreBlend.isApplicable()) {
rgb_to_lcd32<true>(cgPixels, cgRowBytes, glyph,
fPreBlend.fR, fPreBlend.fG, fPreBlend.fB);
} else {
rgb_to_lcd32<false>(cgPixels, cgRowBytes, glyph,
fPreBlend.fR, fPreBlend.fG, fPreBlend.fB);
}
} break;
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;
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) {
CTFontRef font = fCTFont;
SkScalar scaleX = SK_Scalar1;
SkScalar scaleY = SK_Scalar1;
/*
* 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 (fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag) {
SkMatrix m;
fRec.getSingleMatrix(&m);
// start out by assuming that we want no hining in X and Y
scaleX = scaleY = SkFloatToScalar(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 xform = MatrixToCGAffineTransform(m, scaleX, scaleY);
// need to release font when we're done
font = CTFontCreateCopyWithAttributes(fCTFont, 1, &xform, NULL);
}
CGGlyph cgGlyph = (CGGlyph)glyph.getGlyphID(fBaseGlyphCount);
AutoCFRelease<CGPathRef> cgPath(CTFontCreatePathForGlyph(font, cgGlyph, NULL));
path->reset();
if (cgPath != NULL) {
CGPathApply(cgPath, path, SkScalerContext_Mac::CTPathElement);
}
if (fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag) {
SkMatrix m;
m.setScale(SkScalarInvert(scaleX), SkScalarInvert(scaleY));
path->transform(m);
// balance the call to CTFontCreateCopyWithAttributes
CFSafeRelease(font);
}
if (fRec.fFlags & SkScalerContext::kVertical_Flag) {
SkIPoint offset;
getVerticalOffset(cgGlyph, &offset);
path->offset(SkIntToScalar(offset.fX), SkIntToScalar(offset.fY));
}
}
void SkScalerContext_Mac::generateFontMetrics(SkPaint::FontMetrics* mx,
SkPaint::FontMetrics* my) {
CGRect theBounds = CTFontGetBoundingBox(fCTFont);
SkPaint::FontMetrics theMetrics;
theMetrics.fTop = CGToScalar(-CGRectGetMaxY_inline(theBounds));
theMetrics.fAscent = CGToScalar(-CTFontGetAscent(fCTFont));
theMetrics.fDescent = CGToScalar( CTFontGetDescent(fCTFont));
theMetrics.fBottom = CGToScalar(-CGRectGetMinY_inline(theBounds));
theMetrics.fLeading = CGToScalar( CTFontGetLeading(fCTFont));
theMetrics.fAvgCharWidth = CGToScalar( CGRectGetWidth_inline(theBounds));
theMetrics.fXMin = CGToScalar( CGRectGetMinX_inline(theBounds));
theMetrics.fXMax = CGToScalar( CGRectGetMaxX_inline(theBounds));
theMetrics.fXHeight = CGToScalar( CTFontGetXHeight(fCTFont));
if (mx != NULL) {
*mx = theMetrics;
}
if (my != NULL) {
*my = theMetrics;
}
}
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 NULL on failure
// Call must still manage its ownership of provider
static SkTypeface* create_from_dataProvider(CGDataProviderRef provider) {
AutoCFRelease<CGFontRef> cg(CGFontCreateWithDataProvider(provider));
if (NULL == cg) {
return NULL;
}
CTFontRef ct = CTFontCreateWithGraphicsFont(cg, 0, NULL, NULL);
return cg ? SkCreateTypefaceFromCTFont(ct) : NULL;
}
SkTypeface* SkFontHost::CreateTypefaceFromStream(SkStream* stream) {
AutoCFRelease<CGDataProviderRef> provider(SkCreateDataProviderFromStream(stream));
if (NULL == provider) {
return NULL;
}
return create_from_dataProvider(provider);
}
SkTypeface* SkFontHost::CreateTypefaceFromFile(const char path[]) {
AutoCFRelease<CGDataProviderRef> provider(CGDataProviderCreateWithFilename(path));
if (NULL == provider) {
return NULL;
}
return create_from_dataProvider(provider);
}
// 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(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(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;
}
// we might move this into our CGUtils...
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()));
}
// static
SkAdvancedTypefaceMetrics* SkFontHost::GetAdvancedTypefaceMetrics(
uint32_t fontID,
SkAdvancedTypefaceMetrics::PerGlyphInfo perGlyphInfo,
const uint32_t* glyphIDs,
uint32_t glyphIDsCount) {
CTFontRef originalCTFont = GetFontRefFromFontID(fontID);
AutoCFRelease<CTFontRef> ctFont(CTFontCreateCopyWithAttributes(
originalCTFont, CTFontGetUnitsPerEm(originalCTFont), NULL, NULL));
SkAdvancedTypefaceMetrics* info = new SkAdvancedTypefaceMetrics;
{
AutoCFRelease<CFStringRef> fontName(CTFontCopyPostScriptName(ctFont));
CFStringToSkString(fontName, &info->fFontName);
}
info->fMultiMaster = false;
CFIndex glyphCount = CTFontGetGlyphCount(ctFont);
info->fLastGlyphID = SkToU16(glyphCount - 1);
info->fEmSize = CTFontGetUnitsPerEm(ctFont);
if (perGlyphInfo & SkAdvancedTypefaceMetrics::kToUnicode_PerGlyphInfo) {
populate_glyph_to_unicode(ctFont, glyphCount, &info->fGlyphToUnicode);
}
info->fStyle = 0;
// 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 (!GetTableSize(fontID, 'glyf') || !GetTableSize(fontID, 'loca')) {
info->fType = SkAdvancedTypefaceMetrics::kOther_Font;
info->fItalicAngle = 0;
info->fAscent = 0;
info->fDescent = 0;
info->fStemV = 0;
info->fCapHeight = 0;
info->fBBox = SkIRect::MakeEmpty();
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 & kCTFontSymbolicClass) {
info->fStyle |= SkAdvancedTypefaceMetrics::kSymbolic_Style;
}
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 (false) { // TODO: haven't figured out how to know if font is embeddable
// (information is in the OS/2 table)
info->fType = SkAdvancedTypefaceMetrics::kNotEmbeddable_Font;
} else if (perGlyphInfo & SkAdvancedTypefaceMetrics::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(),
glyphCount,
glyphIDs,
glyphIDsCount,
&getWidthAdvance));
}
}
return info;
}
///////////////////////////////////////////////////////////////////////////////
static SK_SFNT_ULONG get_font_type_tag(SkFontID uniqueID) {
CTFontRef ctFont = GetFontRefFromFontID(uniqueID);
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;
}
}
SkStream* SkFontHost::OpenStream(SkFontID uniqueID) {
SK_SFNT_ULONG fontType = get_font_type_tag(uniqueID);
if (0 == fontType) {
return NULL;
}
// get table tags
int numTables = CountTables(uniqueID);
SkTDArray<SkFontTableTag> tableTags;
tableTags.setCount(numTables);
GetTableTags(uniqueID, 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 = GetTableSize(uniqueID, 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];
GetTableData(uniqueID, 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(dataPtr - dataStart);
entry->logicalLength = SkEndian_SwapBE32(tableSize);
dataPtr += (tableSize + 3) & ~3;
++entry;
}
return stream;
}
size_t SkFontHost::GetFileName(SkFontID fontID, char path[], size_t length, int32_t* index) {
SkDEBUGFAIL("SkFontHost::GetFileName unimplemented");
return 0;
}
///////////////////////////////////////////////////////////////////////////////
#include "SkStream.h"
// we take ownership of the ref
static const char* get_str(CFStringRef ref, SkString* str) {
CFStringToSkString(ref, str);
CFSafeRelease(ref);
return str->c_str();
}
void SkFontHost::Serialize(const SkTypeface* face, SkWStream* stream) {
CTFontRef ctFont = typeface_to_fontref(face);
SkFontDescriptor desc(face->style());
SkString tmpStr;
desc.setFamilyName(get_str(CTFontCopyFamilyName(ctFont), &tmpStr));
desc.setFullName(get_str(CTFontCopyFullName(ctFont), &tmpStr));
desc.setPostscriptName(get_str(CTFontCopyPostScriptName(ctFont), &tmpStr));
desc.serialize(stream);
// by convention, we also write out the actual sfnt data, preceeded by
// a packed-length. For now we skip that, so we just write the zero.
stream->writePackedUInt(0);
}
SkTypeface* SkFontHost::Deserialize(SkStream* stream) {
SkFontDescriptor desc(stream);
// by convention, Serialize will have also written the actual sfnt data.
// for now, we just want to skip it.
size_t size = stream->readPackedUInt();
stream->skip(size);
return SkFontHost::CreateTypeface(NULL, desc.getFamilyName(), desc.getStyle());
}
///////////////////////////////////////////////////////////////////////////////
SkScalerContext* SkFontHost::CreateScalerContext(const SkDescriptor* desc) {
return new SkScalerContext_Mac(desc);
}
SkFontID SkFontHost::NextLogicalFont(SkFontID currFontID, SkFontID origFontID) {
SkFontID nextFontID = 0;
SkTypeface* face = GetDefaultFace();
if (face->uniqueID() != currFontID) {
nextFontID = face->uniqueID();
}
return nextFontID;
}
void SkFontHost::FilterRec(SkScalerContext::Rec* rec, SkTypeface*) {
unsigned flagsWeDontSupport = SkScalerContext::kDevKernText_Flag |
SkScalerContext::kAutohinting_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;
}
}
// 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);
}
}
///////////////////////////////////////////////////////////////////////////
int SkFontHost::CountTables(SkFontID fontID) {
CTFontRef ctFont = GetFontRefFromFontID(fontID);
AutoCFRelease<CFArrayRef> cfArray(CTFontCopyAvailableTables(ctFont,
kCTFontTableOptionNoOptions));
if (NULL == cfArray) {
return 0;
}
return CFArrayGetCount(cfArray);
}
int SkFontHost::GetTableTags(SkFontID fontID, SkFontTableTag tags[]) {
CTFontRef ctFont = GetFontRefFromFontID(fontID);
AutoCFRelease<CFArrayRef> cfArray(CTFontCopyAvailableTables(ctFont,
kCTFontTableOptionNoOptions));
if (NULL == cfArray) {
return 0;
}
int count = 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;
}
// 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 (NULL == data) {
AutoCFRelease<CGFontRef> cgFont(CTFontCopyGraphicsFont(ctFont, NULL));
data = CGFontCopyTableForTag(cgFont, tag);
}
return data;
}
size_t SkFontHost::GetTableSize(SkFontID fontID, SkFontTableTag tag) {
CTFontRef ctFont = GetFontRefFromFontID(fontID);
AutoCFRelease<CFDataRef> srcData(copyTableFromFont(ctFont, tag));
if (NULL == srcData) {
return 0;
}
return CFDataGetLength(srcData);
}
size_t SkFontHost::GetTableData(SkFontID fontID, SkFontTableTag tag,
size_t offset, size_t length, void* dst) {
CTFontRef ctFont = GetFontRefFromFontID(fontID);
AutoCFRelease<CFDataRef> srcData(copyTableFromFont(ctFont, tag));
if (NULL == srcData) {
return 0;
}
size_t srcSize = CFDataGetLength(srcData);
if (offset >= srcSize) {
return 0;
}
if ((offset + length) > srcSize) {
length = srcSize - offset;
}
if (dst) {
memcpy(dst, CFDataGetBytePtr(srcData) + offset, length);
}
return length;
}