3 * Copyright 2006 The Android Open Source Project
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
10 #ifdef SK_BUILD_FOR_MAC
11 #import <ApplicationServices/ApplicationServices.h>
14 #ifdef SK_BUILD_FOR_IOS
15 #include <CoreText/CoreText.h>
16 #include <CoreText/CTFontManager.h>
17 #include <CoreGraphics/CoreGraphics.h>
18 #include <CoreFoundation/CoreFoundation.h>
21 #include "SkFontHost.h"
22 #include "SkCGUtils.h"
23 #include "SkColorPriv.h"
24 #include "SkDescriptor.h"
26 #include "SkFontDescriptor.h"
27 #include "SkFloatingPoint.h"
29 #include "SkMaskGamma.h"
30 #include "SkSFNTHeader.h"
31 #include "SkOTTable_glyf.h"
32 #include "SkOTTable_head.h"
33 #include "SkOTTable_hhea.h"
34 #include "SkOTTable_loca.h"
35 #include "SkOTUtils.h"
41 #include "SkTypeface_mac.h"
43 #include "SkTypefaceCache.h"
44 #include "SkFontMgr.h"
47 //#define HACK_COLORGLYPHS
49 class SkScalerContext_Mac;
51 // CTFontManagerCopyAvailableFontFamilyNames() is not always available, so we
52 // provide a wrapper here that will return an empty array if need be.
53 static CFArrayRef SkCTFontManagerCopyAvailableFontFamilyNames() {
54 #ifdef SK_BUILD_FOR_IOS
55 return CFArrayCreate(NULL, NULL, 0, NULL);
57 return CTFontManagerCopyAvailableFontFamilyNames();
62 // Being templated and taking const T* prevents calling
63 // CFSafeRelease(autoCFRelease) through implicit conversion.
64 template <typename T> static void CFSafeRelease(/*CFTypeRef*/const T* cfTypeRef) {
70 // Being templated and taking const T* prevents calling
71 // CFSafeRetain(autoCFRelease) through implicit conversion.
72 template <typename T> static void CFSafeRetain(/*CFTypeRef*/const T* cfTypeRef) {
78 /** Acts like a CFRef, but calls CFSafeRelease when it goes out of scope. */
79 template<typename CFRef> class AutoCFRelease : private SkNoncopyable {
81 explicit AutoCFRelease(CFRef cfRef = NULL) : fCFRef(cfRef) { }
82 ~AutoCFRelease() { CFSafeRelease(fCFRef); }
84 void reset(CFRef that = NULL) {
86 CFSafeRelease(fCFRef);
90 AutoCFRelease& operator =(CFRef that) {
95 operator CFRef() const { return fCFRef; }
96 CFRef get() const { return fCFRef; }
98 CFRef* operator&() { SkASSERT(fCFRef == NULL); return &fCFRef; }
103 static CFStringRef make_CFString(const char str[]) {
104 return CFStringCreateWithCString(NULL, str, kCFStringEncodingUTF8);
107 template<typename T> class AutoCGTable : SkNoncopyable {
109 AutoCGTable(CGFontRef font)
110 //Undocumented: the tag parameter in this call is expected in machine order and not BE order.
111 : fCFData(CGFontCopyTableForTag(font, SkSetFourByteTag(T::TAG0, T::TAG1, T::TAG2, T::TAG3)))
112 , fData(fCFData ? reinterpret_cast<const T*>(CFDataGetBytePtr(fCFData)) : NULL)
115 const T* operator->() const { return fData; }
118 AutoCFRelease<CFDataRef> fCFData;
123 // inline versions of these rect helpers
125 static bool CGRectIsEmpty_inline(const CGRect& rect) {
126 return rect.size.width <= 0 || rect.size.height <= 0;
129 static CGFloat CGRectGetMinX_inline(const CGRect& rect) {
130 return rect.origin.x;
133 static CGFloat CGRectGetMaxX_inline(const CGRect& rect) {
134 return rect.origin.x + rect.size.width;
137 static CGFloat CGRectGetMinY_inline(const CGRect& rect) {
138 return rect.origin.y;
141 static CGFloat CGRectGetMaxY_inline(const CGRect& rect) {
142 return rect.origin.y + rect.size.height;
145 static CGFloat CGRectGetWidth_inline(const CGRect& rect) {
146 return rect.size.width;
149 ///////////////////////////////////////////////////////////////////////////////
151 static void sk_memset_rect32(uint32_t* ptr, uint32_t value,
152 size_t width, size_t height, size_t rowBytes) {
154 SkASSERT(width * sizeof(uint32_t) <= rowBytes);
158 sk_memset32(ptr, value, width);
159 ptr = (uint32_t*)((char*)ptr + rowBytes);
165 rowBytes -= width * sizeof(uint32_t);
171 *ptr++ = value; *ptr++ = value;
172 *ptr++ = value; *ptr++ = value;
173 *ptr++ = value; *ptr++ = value;
174 *ptr++ = value; *ptr++ = value;
180 ptr = (uint32_t*)((char*)ptr + rowBytes);
189 ptr = (uint32_t*)((char*)ptr + rowBytes);
195 #include <sys/utsname.h>
197 typedef uint32_t CGRGBPixel;
199 static unsigned CGRGBPixel_getAlpha(CGRGBPixel pixel) {
203 // The calls to support subpixel are present in 10.5, but are not included in
204 // the 10.5 SDK. The needed calls have been extracted from the 10.6 SDK and are
205 // included below. To verify that CGContextSetShouldSubpixelQuantizeFonts, for
206 // instance, is present in the 10.5 CoreGraphics libary, use:
207 // cd /Developer/SDKs/MacOSX10.5.sdk/System/Library/Frameworks/
208 // cd ApplicationServices.framework/Frameworks/CoreGraphics.framework/
209 // nm CoreGraphics | grep CGContextSetShouldSubpixelQuantizeFonts
211 #if !defined(MAC_OS_X_VERSION_10_6) || (MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_6)
212 CG_EXTERN void CGContextSetAllowsFontSmoothing(CGContextRef context, bool value);
213 CG_EXTERN void CGContextSetAllowsFontSubpixelPositioning(CGContextRef context, bool value);
214 CG_EXTERN void CGContextSetShouldSubpixelPositionFonts(CGContextRef context, bool value);
215 CG_EXTERN void CGContextSetAllowsFontSubpixelQuantization(CGContextRef context, bool value);
216 CG_EXTERN void CGContextSetShouldSubpixelQuantizeFonts(CGContextRef context, bool value);
219 static const char FONT_DEFAULT_NAME[] = "Lucida Sans";
221 // See Source/WebKit/chromium/base/mac/mac_util.mm DarwinMajorVersionInternal for original source.
222 static int readVersion() {
224 if (uname(&info) != 0) {
225 SkDebugf("uname failed\n");
228 if (strcmp(info.sysname, "Darwin") != 0) {
229 SkDebugf("unexpected uname sysname %s\n", info.sysname);
232 char* dot = strchr(info.release, '.');
234 SkDebugf("expected dot in uname release %s\n", info.release);
237 int version = atoi(info.release);
239 SkDebugf("could not parse uname release %s\n", info.release);
244 static int darwinVersion() {
245 static int darwin_version = readVersion();
246 return darwin_version;
249 static bool isSnowLeopard() {
250 return darwinVersion() == 10;
253 static bool isLion() {
254 return darwinVersion() == 11;
257 static bool isMountainLion() {
258 return darwinVersion() == 12;
261 static bool isLCDFormat(unsigned format) {
262 return SkMask::kLCD16_Format == format || SkMask::kLCD32_Format == format;
265 static CGFloat ScalarToCG(SkScalar scalar) {
266 if (sizeof(CGFloat) == sizeof(float)) {
267 return SkScalarToFloat(scalar);
269 SkASSERT(sizeof(CGFloat) == sizeof(double));
270 return (CGFloat) SkScalarToDouble(scalar);
274 static SkScalar CGToScalar(CGFloat cgFloat) {
275 if (sizeof(CGFloat) == sizeof(float)) {
276 return SkFloatToScalar(cgFloat);
278 SkASSERT(sizeof(CGFloat) == sizeof(double));
279 return SkDoubleToScalar(cgFloat);
283 static CGAffineTransform MatrixToCGAffineTransform(const SkMatrix& matrix,
284 SkScalar sx = SK_Scalar1,
285 SkScalar sy = SK_Scalar1) {
286 return CGAffineTransformMake( ScalarToCG(matrix[SkMatrix::kMScaleX] * sx),
287 -ScalarToCG(matrix[SkMatrix::kMSkewY] * sy),
288 -ScalarToCG(matrix[SkMatrix::kMSkewX] * sx),
289 ScalarToCG(matrix[SkMatrix::kMScaleY] * sy),
290 ScalarToCG(matrix[SkMatrix::kMTransX] * sx),
291 ScalarToCG(matrix[SkMatrix::kMTransY] * sy));
294 ///////////////////////////////////////////////////////////////////////////////
296 #define BITMAP_INFO_RGB (kCGImageAlphaNoneSkipFirst | kCGBitmapByteOrder32Host)
297 #define BITMAP_INFO_GRAY (kCGImageAlphaNone)
300 * There does not appear to be a publicly accessable API for determining if lcd
301 * font smoothing will be applied if we request it. The main issue is that if
302 * smoothing is applied a gamma of 2.0 will be used, if not a gamma of 1.0.
304 static bool supports_LCD() {
305 static int gSupportsLCD = -1;
306 if (gSupportsLCD >= 0) {
307 return (bool) gSupportsLCD;
310 AutoCFRelease<CGColorSpaceRef> colorspace(CGColorSpaceCreateDeviceRGB());
311 AutoCFRelease<CGContextRef> cgContext(CGBitmapContextCreate(&rgb, 1, 1, 8, 4,
312 colorspace, BITMAP_INFO_RGB));
313 CGContextSelectFont(cgContext, "Helvetica", 16, kCGEncodingMacRoman);
314 CGContextSetShouldSmoothFonts(cgContext, true);
315 CGContextSetShouldAntialias(cgContext, true);
316 CGContextSetTextDrawingMode(cgContext, kCGTextFill);
317 CGContextSetGrayFillColor(cgContext, 1, 1);
318 CGContextShowTextAtPoint(cgContext, -1, 0, "|", 1);
319 uint32_t r = (rgb >> 16) & 0xFF;
320 uint32_t g = (rgb >> 8) & 0xFF;
321 uint32_t b = (rgb >> 0) & 0xFF;
322 gSupportsLCD = (r != g || r != b);
323 return (bool) gSupportsLCD;
330 CGRGBPixel* getCG(const SkScalerContext_Mac& context, const SkGlyph& glyph,
331 CGGlyph glyphID, size_t* rowBytesPtr,
332 bool generateA8FromLCD);
336 kSize = 32 * 32 * sizeof(CGRGBPixel)
338 SkAutoSMalloc<kSize> fImageStorage;
339 AutoCFRelease<CGColorSpaceRef> fRGBSpace;
342 AutoCFRelease<CGContextRef> fCG;
347 static int RoundSize(int dimension) {
348 return SkNextPow2(dimension);
352 Offscreen::Offscreen() : fRGBSpace(NULL), fCG(NULL),
353 fDoAA(false), fDoLCD(false) {
357 ///////////////////////////////////////////////////////////////////////////////
359 static SkTypeface::Style computeStyleBits(CTFontRef font, bool* isFixedPitch) {
360 unsigned style = SkTypeface::kNormal;
361 CTFontSymbolicTraits traits = CTFontGetSymbolicTraits(font);
363 if (traits & kCTFontBoldTrait) {
364 style |= SkTypeface::kBold;
366 if (traits & kCTFontItalicTrait) {
367 style |= SkTypeface::kItalic;
370 *isFixedPitch = (traits & kCTFontMonoSpaceTrait) != 0;
372 return (SkTypeface::Style)style;
375 static SkFontID CTFontRef_to_SkFontID(CTFontRef fontRef) {
377 // CTFontGetPlatformFont and ATSFontRef are not supported on iOS, so we have to
378 // bracket this to be Mac only.
379 #ifdef SK_BUILD_FOR_MAC
380 ATSFontRef ats = CTFontGetPlatformFont(fontRef, NULL);
383 id &= 0x3FFFFFFF; // make top two bits 00
387 // CTFontGetPlatformFont returns NULL if the font is local
388 // (e.g., was created by a CSS3 @font-face rule).
389 AutoCFRelease<CGFontRef> cgFont(CTFontCopyGraphicsFont(fontRef, NULL));
390 AutoCGTable<SkOTTableHead> headTable(cgFont);
391 if (headTable.fData) {
392 id = (SkFontID) headTable->checksumAdjustment;
393 id = (id & 0x3FFFFFFF) | 0x40000000; // make top two bits 01
395 // well-formed fonts have checksums, but as a last resort, use the pointer.
397 id = (SkFontID) (uintptr_t) fontRef;
398 id = (id & 0x3FFFFFFF) | 0x80000000; // make top two bits 10
403 static SkFontStyle stylebits2fontstyle(SkTypeface::Style styleBits) {
404 return SkFontStyle((styleBits & SkTypeface::kBold)
405 ? SkFontStyle::kBold_Weight
406 : SkFontStyle::kNormal_Weight,
407 SkFontStyle::kNormal_Width,
408 (styleBits & SkTypeface::kItalic)
409 ? SkFontStyle::kItalic_Slant
410 : SkFontStyle::kUpright_Slant);
413 #define WEIGHT_THRESHOLD ((SkFontStyle::kNormal_Weight + SkFontStyle::kBold_Weight)/2)
415 static SkTypeface::Style fontstyle2stylebits(const SkFontStyle& fs) {
417 if (fs.width() >= WEIGHT_THRESHOLD) {
418 style |= SkTypeface::kBold;
421 style |= SkTypeface::kItalic;
423 return (SkTypeface::Style)style;
426 class SkTypeface_Mac : public SkTypeface {
428 SkTypeface_Mac(SkTypeface::Style style, SkFontID fontID, bool isFixedPitch,
429 CTFontRef fontRef, const char name[])
430 : SkTypeface(style, fontID, isFixedPitch)
432 , fFontRef(fontRef) // caller has already called CFRetain for us
433 , fFontStyle(stylebits2fontstyle(style))
438 SkTypeface_Mac(const SkFontStyle& fs, SkFontID fontID, bool isFixedPitch,
439 CTFontRef fontRef, const char name[])
440 : SkTypeface(fontstyle2stylebits(fs), fontID, isFixedPitch)
442 , fFontRef(fontRef) // caller has already called CFRetain for us
449 AutoCFRelease<CTFontRef> fFontRef;
450 SkFontStyle fFontStyle;
453 friend class SkFontHost; // to access our protected members for deprecated methods
455 virtual int onGetUPEM() const SK_OVERRIDE;
456 virtual SkStream* onOpenStream(int* ttcIndex) const SK_OVERRIDE;
457 virtual SkTypeface::LocalizedStrings* onCreateFamilyNameIterator() const SK_OVERRIDE;
458 virtual int onGetTableTags(SkFontTableTag tags[]) const SK_OVERRIDE;
459 virtual size_t onGetTableData(SkFontTableTag, size_t offset,
460 size_t length, void* data) const SK_OVERRIDE;
461 virtual SkScalerContext* onCreateScalerContext(const SkDescriptor*) const SK_OVERRIDE;
462 virtual void onFilterRec(SkScalerContextRec*) const SK_OVERRIDE;
463 virtual void onGetFontDescriptor(SkFontDescriptor*, bool*) const SK_OVERRIDE;
464 virtual SkAdvancedTypefaceMetrics* onGetAdvancedTypefaceMetrics(
465 SkAdvancedTypefaceMetrics::PerGlyphInfo,
466 const uint32_t*, uint32_t) const SK_OVERRIDE;
467 virtual int onCharsToGlyphs(const void* chars, Encoding, uint16_t glyphs[],
468 int glyphCount) const SK_OVERRIDE;
469 virtual int onCountGlyphs() const SK_OVERRIDE;
470 virtual SkTypeface* onRefMatchingStyle(Style) const SK_OVERRIDE;
474 typedef SkTypeface INHERITED;
477 static SkTypeface* NewFromFontRef(CTFontRef fontRef, const char name[]) {
480 SkTypeface::Style style = computeStyleBits(fontRef, &isFixedPitch);
481 SkFontID fontID = CTFontRef_to_SkFontID(fontRef);
483 return new SkTypeface_Mac(style, fontID, isFixedPitch, fontRef, name);
486 static SkTypeface* NewFromName(const char familyName[], SkTypeface::Style theStyle) {
487 CTFontRef ctFont = NULL;
489 CTFontSymbolicTraits ctFontTraits = 0;
490 if (theStyle & SkTypeface::kBold) {
491 ctFontTraits |= kCTFontBoldTrait;
493 if (theStyle & SkTypeface::kItalic) {
494 ctFontTraits |= kCTFontItalicTrait;
497 // Create the font info
498 AutoCFRelease<CFStringRef> cfFontName(make_CFString(familyName));
500 AutoCFRelease<CFNumberRef> cfFontTraits(
501 CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &ctFontTraits));
503 AutoCFRelease<CFMutableDictionaryRef> cfAttributes(
504 CFDictionaryCreateMutable(kCFAllocatorDefault, 0,
505 &kCFTypeDictionaryKeyCallBacks,
506 &kCFTypeDictionaryValueCallBacks));
508 AutoCFRelease<CFMutableDictionaryRef> cfTraits(
509 CFDictionaryCreateMutable(kCFAllocatorDefault, 0,
510 &kCFTypeDictionaryKeyCallBacks,
511 &kCFTypeDictionaryValueCallBacks));
514 if (cfFontName != NULL && cfFontTraits != NULL && cfAttributes != NULL && cfTraits != NULL) {
515 CFDictionaryAddValue(cfTraits, kCTFontSymbolicTrait, cfFontTraits);
517 CFDictionaryAddValue(cfAttributes, kCTFontFamilyNameAttribute, cfFontName);
518 CFDictionaryAddValue(cfAttributes, kCTFontTraitsAttribute, cfTraits);
520 AutoCFRelease<CTFontDescriptorRef> ctFontDesc(
521 CTFontDescriptorCreateWithAttributes(cfAttributes));
523 if (ctFontDesc != NULL) {
524 ctFont = CTFontCreateWithFontDescriptor(ctFontDesc, 0, NULL);
528 return ctFont ? NewFromFontRef(ctFont, familyName) : NULL;
531 static SkTypeface* GetDefaultFace() {
532 SK_DECLARE_STATIC_MUTEX(gMutex);
533 SkAutoMutexAcquire ma(gMutex);
535 static SkTypeface* gDefaultFace;
537 if (NULL == gDefaultFace) {
538 gDefaultFace = NewFromName(FONT_DEFAULT_NAME, SkTypeface::kNormal);
539 SkTypefaceCache::Add(gDefaultFace, SkTypeface::kNormal);
544 ///////////////////////////////////////////////////////////////////////////////
546 extern CTFontRef SkTypeface_GetCTFontRef(const SkTypeface* face);
547 CTFontRef SkTypeface_GetCTFontRef(const SkTypeface* face) {
548 const SkTypeface_Mac* macface = (const SkTypeface_Mac*)face;
549 return macface ? macface->fFontRef.get() : NULL;
552 /* This function is visible on the outside. It first searches the cache, and if
553 * not found, returns a new entry (after adding it to the cache).
555 SkTypeface* SkCreateTypefaceFromCTFont(CTFontRef fontRef) {
556 SkFontID fontID = CTFontRef_to_SkFontID(fontRef);
557 SkTypeface* face = SkTypefaceCache::FindByID(fontID);
561 face = NewFromFontRef(fontRef, NULL);
562 SkTypefaceCache::Add(face, face->style());
563 // NewFromFontRef doesn't retain the parameter, but the typeface it
564 // creates does release it in its destructor, so we balance that with
565 // a retain call here.
568 SkASSERT(face->getRefCnt() > 1);
572 struct NameStyleRec {
574 SkTypeface::Style fStyle;
577 static bool FindByNameStyle(SkTypeface* face, SkTypeface::Style style,
579 const SkTypeface_Mac* mface = reinterpret_cast<SkTypeface_Mac*>(face);
580 const NameStyleRec* rec = reinterpret_cast<const NameStyleRec*>(ctx);
582 return rec->fStyle == style && mface->fName.equals(rec->fName);
585 static const char* map_css_names(const char* name) {
586 static const struct {
587 const char* fFrom; // name the caller specified
588 const char* fTo; // "canonical" name we map to
590 { "sans-serif", "Helvetica" },
591 { "serif", "Times" },
592 { "monospace", "Courier" }
595 for (size_t i = 0; i < SK_ARRAY_COUNT(gPairs); i++) {
596 if (strcmp(name, gPairs[i].fFrom) == 0) {
597 return gPairs[i].fTo;
600 return name; // no change
603 static SkTypeface* create_typeface(const SkTypeface* familyFace,
604 const char familyName[],
605 SkTypeface::Style style) {
607 familyName = map_css_names(familyName);
610 // Clone an existing typeface
611 // TODO: only clone if style matches the familyFace's style...
612 if (familyName == NULL && familyFace != NULL) {
614 return const_cast<SkTypeface*>(familyFace);
617 if (!familyName || !*familyName) {
618 familyName = FONT_DEFAULT_NAME;
621 NameStyleRec rec = { familyName, style };
622 SkTypeface* face = SkTypefaceCache::FindByProcAndRef(FindByNameStyle, &rec);
625 face = NewFromName(familyName, style);
627 SkTypefaceCache::Add(face, style);
629 face = GetDefaultFace();
636 SkTypeface* SkTypeface_Mac::onRefMatchingStyle(Style styleBits) const {
637 return create_typeface(this, NULL, styleBits);
640 ///////////////////////////////////////////////////////////////////////////////
642 /** GlyphRect is in FUnits (em space, y up). */
650 class SkScalerContext_Mac : public SkScalerContext {
652 SkScalerContext_Mac(SkTypeface_Mac*, const SkDescriptor*);
655 unsigned generateGlyphCount(void) SK_OVERRIDE;
656 uint16_t generateCharToGlyph(SkUnichar uni) SK_OVERRIDE;
657 void generateAdvance(SkGlyph* glyph) SK_OVERRIDE;
658 void generateMetrics(SkGlyph* glyph) SK_OVERRIDE;
659 void generateImage(const SkGlyph& glyph) SK_OVERRIDE;
660 void generatePath(const SkGlyph& glyph, SkPath* path) SK_OVERRIDE;
661 void generateFontMetrics(SkPaint::FontMetrics* mX, SkPaint::FontMetrics* mY) SK_OVERRIDE;
664 static void CTPathElement(void *info, const CGPathElement *element);
666 /** Returns the offset from the horizontal origin to the vertical origin in SkGlyph units. */
667 void getVerticalOffset(CGGlyph glyphID, SkPoint* offset) const;
669 /** Initializes and returns the value of fFBoundingBoxesGlyphOffset.
671 * For use with (and must be called before) generateBBoxes.
673 uint16_t getFBoundingBoxesGlyphOffset();
675 /** Initializes fFBoundingBoxes and returns true on success.
677 * On Lion and Mountain Lion, CTFontGetBoundingRectsForGlyphs has a bug which causes it to
678 * return a bad value in bounds.origin.x for SFNT fonts whose hhea::numberOfHMetrics is
679 * less than its maxp::numGlyphs. When this is the case we try to read the bounds from the
682 * This routine initializes fFBoundingBoxes to an array of
683 * fGlyphCount - fFBoundingBoxesGlyphOffset GlyphRects which contain the bounds in FUnits
684 * (em space, y up) of glyphs with ids in the range [fFBoundingBoxesGlyphOffset, fGlyphCount).
686 * Returns true if fFBoundingBoxes is properly initialized. The table can only be properly
687 * initialized for a TrueType font with 'head', 'loca', and 'glyf' tables.
689 * TODO: A future optimization will compute fFBoundingBoxes once per fCTFont.
691 bool generateBBoxes();
693 /** Converts from FUnits (em space, y up) to SkGlyph units (pixels, y down).
695 * Used on Snow Leopard to correct CTFontGetVerticalTranslationsForGlyphs.
696 * Used on Lion to correct CTFontGetBoundingRectsForGlyphs.
698 SkMatrix fFUnitMatrix;
700 Offscreen fOffscreen;
701 AutoCFRelease<CTFontRef> fCTFont;
703 /** Vertical variant of fCTFont.
705 * CT vertical metrics are pre-rotated (in em space, before transform) 90deg clock-wise.
706 * This makes kCTFontDefaultOrientation dangerous, because the metrics from
707 * kCTFontHorizontalOrientation are in a different space from kCTFontVerticalOrientation.
708 * Use fCTVerticalFont with kCTFontVerticalOrientation to get metrics in the same space.
710 AutoCFRelease<CTFontRef> fCTVerticalFont;
712 AutoCFRelease<CGFontRef> fCGFont;
713 SkAutoTMalloc<GlyphRect> fFBoundingBoxes;
714 uint16_t fFBoundingBoxesGlyphOffset;
715 uint16_t fGlyphCount;
716 bool fGeneratedFBoundingBoxes;
717 const bool fDoSubPosition;
718 const bool fVertical;
720 friend class Offscreen;
722 typedef SkScalerContext INHERITED;
725 SkScalerContext_Mac::SkScalerContext_Mac(SkTypeface_Mac* typeface,
726 const SkDescriptor* desc)
727 : INHERITED(typeface, desc)
729 , fFBoundingBoxesGlyphOffset(0)
730 , fGeneratedFBoundingBoxes(false)
731 , fDoSubPosition(SkToBool(fRec.fFlags & kSubpixelPositioning_Flag))
732 , fVertical(SkToBool(fRec.fFlags & kVertical_Flag))
735 CTFontRef ctFont = typeface->fFontRef.get();
736 CFIndex numGlyphs = CTFontGetGlyphCount(ctFont);
737 SkASSERT(numGlyphs >= 1 && numGlyphs <= 0xFFFF);
738 fGlyphCount = SkToU16(numGlyphs);
740 fRec.getSingleMatrix(&fFUnitMatrix);
741 CGAffineTransform transform = MatrixToCGAffineTransform(fFUnitMatrix);
743 AutoCFRelease<CTFontDescriptorRef> ctFontDesc;
745 AutoCFRelease<CFMutableDictionaryRef> cfAttributes(CFDictionaryCreateMutable(
746 kCFAllocatorDefault, 0,
747 &kCFTypeDictionaryKeyCallBacks,
748 &kCFTypeDictionaryValueCallBacks));
750 CTFontOrientation ctOrientation = kCTFontVerticalOrientation;
751 AutoCFRelease<CFNumberRef> cfVertical(CFNumberCreate(
752 kCFAllocatorDefault, kCFNumberSInt32Type, &ctOrientation));
753 CFDictionaryAddValue(cfAttributes, kCTFontOrientationAttribute, cfVertical);
754 ctFontDesc = CTFontDescriptorCreateWithAttributes(cfAttributes);
757 // Since our matrix includes everything, we pass 1 for size.
758 fCTFont = CTFontCreateCopyWithAttributes(ctFont, 1, &transform, ctFontDesc);
759 fCGFont = CTFontCopyGraphicsFont(fCTFont, NULL);
761 CGAffineTransform rotateLeft = CGAffineTransformMake(0, -1, 1, 0, 0, 0);
762 transform = CGAffineTransformConcat(rotateLeft, transform);
763 fCTVerticalFont = CTFontCreateCopyWithAttributes(ctFont, 1, &transform, NULL);
766 SkScalar emPerFUnit = SkScalarInvert(SkIntToScalar(CGFontGetUnitsPerEm(fCGFont)));
767 fFUnitMatrix.preScale(emPerFUnit, -emPerFUnit);
770 CGRGBPixel* Offscreen::getCG(const SkScalerContext_Mac& context, const SkGlyph& glyph,
771 CGGlyph glyphID, size_t* rowBytesPtr,
772 bool generateA8FromLCD) {
774 //It doesn't appear to matter what color space is specified.
775 //Regular blends and antialiased text are always (s*a + d*(1-a))
776 //and smoothed text is always g=2.0.
777 fRGBSpace = CGColorSpaceCreateDeviceRGB();
780 // default to kBW_Format
784 if (SkMask::kBW_Format != glyph.fMaskFormat) {
789 // FIXME: lcd smoothed un-hinted rasterization unsupported.
790 if (!generateA8FromLCD && SkMask::kA8_Format == glyph.fMaskFormat) {
795 size_t rowBytes = fSize.fWidth * sizeof(CGRGBPixel);
796 if (!fCG || fSize.fWidth < glyph.fWidth || fSize.fHeight < glyph.fHeight) {
797 if (fSize.fWidth < glyph.fWidth) {
798 fSize.fWidth = RoundSize(glyph.fWidth);
800 if (fSize.fHeight < glyph.fHeight) {
801 fSize.fHeight = RoundSize(glyph.fHeight);
804 rowBytes = fSize.fWidth * sizeof(CGRGBPixel);
805 void* image = fImageStorage.reset(rowBytes * fSize.fHeight);
806 fCG = CGBitmapContextCreate(image, fSize.fWidth, fSize.fHeight, 8,
807 rowBytes, fRGBSpace, BITMAP_INFO_RGB);
809 // skia handles quantization itself, so we disable this for cg to get
810 // full fractional data from them.
811 CGContextSetAllowsFontSubpixelQuantization(fCG, false);
812 CGContextSetShouldSubpixelQuantizeFonts(fCG, false);
814 CGContextSetTextDrawingMode(fCG, kCGTextFill);
815 CGContextSetFont(fCG, context.fCGFont);
816 CGContextSetFontSize(fCG, 1 /*CTFontGetSize(context.fCTFont)*/);
817 CGContextSetTextMatrix(fCG, CTFontGetMatrix(context.fCTFont));
819 // Because CG always draws from the horizontal baseline,
820 // if there is a non-integral translation from the horizontal origin to the vertical origin,
821 // then CG cannot draw the glyph in the correct location without subpixel positioning.
822 CGContextSetAllowsFontSubpixelPositioning(fCG, context.fDoSubPosition || context.fVertical);
823 CGContextSetShouldSubpixelPositionFonts(fCG, context.fDoSubPosition || context.fVertical);
825 // Draw white on black to create mask.
826 // TODO: Draw black on white and invert, CG has a special case codepath.
827 CGContextSetGrayFillColor(fCG, 1.0f, 1.0f);
829 // force our checks below to happen
835 CGContextSetShouldAntialias(fCG, doAA);
838 if (fDoLCD != doLCD) {
839 CGContextSetShouldSmoothFonts(fCG, doLCD);
843 CGRGBPixel* image = (CGRGBPixel*)fImageStorage.get();
844 // skip rows based on the glyph's height
845 image += (fSize.fHeight - glyph.fHeight) * fSize.fWidth;
848 sk_memset_rect32(image, 0, glyph.fWidth, glyph.fHeight, rowBytes);
852 if (context.fDoSubPosition) {
853 subX = SkFixedToFloat(glyph.getSubXFixed());
854 subY = SkFixedToFloat(glyph.getSubYFixed());
857 // CGContextShowGlyphsAtPoint always draws using the horizontal baseline origin.
858 if (context.fVertical) {
860 context.getVerticalOffset(glyphID, &offset);
865 CGContextShowGlyphsAtPoint(fCG, -glyph.fLeft + subX,
866 glyph.fTop + glyph.fHeight - subY,
869 SkASSERT(rowBytesPtr);
870 *rowBytesPtr = rowBytes;
874 void SkScalerContext_Mac::getVerticalOffset(CGGlyph glyphID, SkPoint* offset) const {
875 // Snow Leopard returns cgVertOffset in completely un-transformed FUnits (em space, y up).
876 // Lion and Leopard return cgVertOffset in CG units (pixels, y up).
878 CTFontGetVerticalTranslationsForGlyphs(fCTFont, &glyphID, &cgVertOffset, 1);
880 SkPoint skVertOffset = { CGToScalar(cgVertOffset.width), CGToScalar(cgVertOffset.height) };
881 if (isSnowLeopard()) {
882 // From FUnits (em space, y up) to SkGlyph units (pixels, y down).
883 fFUnitMatrix.mapPoints(&skVertOffset, 1);
885 // From CG units (pixels, y up) to SkGlyph units (pixels, y down).
886 skVertOffset.fY = -skVertOffset.fY;
889 *offset = skVertOffset;
892 uint16_t SkScalerContext_Mac::getFBoundingBoxesGlyphOffset() {
893 if (fFBoundingBoxesGlyphOffset) {
894 return fFBoundingBoxesGlyphOffset;
896 fFBoundingBoxesGlyphOffset = fGlyphCount; // fallback for all fonts
897 AutoCGTable<SkOTTableHorizontalHeader> hheaTable(fCGFont);
898 if (hheaTable.fData) {
899 fFBoundingBoxesGlyphOffset = SkEndian_SwapBE16(hheaTable->numberOfHMetrics);
901 return fFBoundingBoxesGlyphOffset;
904 bool SkScalerContext_Mac::generateBBoxes() {
905 if (fGeneratedFBoundingBoxes) {
906 return NULL != fFBoundingBoxes.get();
908 fGeneratedFBoundingBoxes = true;
910 AutoCGTable<SkOTTableHead> headTable(fCGFont);
911 if (!headTable.fData) {
915 AutoCGTable<SkOTTableIndexToLocation> locaTable(fCGFont);
916 if (!locaTable.fData) {
920 AutoCGTable<SkOTTableGlyph> glyfTable(fCGFont);
921 if (!glyfTable.fData) {
925 uint16_t entries = fGlyphCount - fFBoundingBoxesGlyphOffset;
926 fFBoundingBoxes.reset(entries);
928 SkOTTableHead::IndexToLocFormat locaFormat = headTable->indexToLocFormat;
929 SkOTTableGlyph::Iterator glyphDataIter(*glyfTable.fData, *locaTable.fData, locaFormat);
930 glyphDataIter.advance(fFBoundingBoxesGlyphOffset);
931 for (uint16_t boundingBoxesIndex = 0; boundingBoxesIndex < entries; ++boundingBoxesIndex) {
932 const SkOTTableGlyphData* glyphData = glyphDataIter.next();
933 GlyphRect& rect = fFBoundingBoxes[boundingBoxesIndex];
934 rect.fMinX = SkEndian_SwapBE16(glyphData->xMin);
935 rect.fMinY = SkEndian_SwapBE16(glyphData->yMin);
936 rect.fMaxX = SkEndian_SwapBE16(glyphData->xMax);
937 rect.fMaxY = SkEndian_SwapBE16(glyphData->yMax);
943 unsigned SkScalerContext_Mac::generateGlyphCount(void) {
947 uint16_t SkScalerContext_Mac::generateCharToGlyph(SkUnichar uni) {
949 UniChar theChar[2]; // UniChar is a UTF-16 16-bit code unit.
952 size_t numUniChar = SkUTF16_FromUnichar(uni, theChar);
953 SkASSERT(sizeof(CGGlyph) <= sizeof(uint16_t));
955 // Undocumented behavior of CTFontGetGlyphsForCharacters with non-bmp code points:
956 // When a surrogate pair is detected, the glyph index used is the index of the high surrogate.
957 // It is documented that if a mapping is unavailable, the glyph will be set to 0.
958 CTFontGetGlyphsForCharacters(fCTFont, theChar, cgGlyph, numUniChar);
962 void SkScalerContext_Mac::generateAdvance(SkGlyph* glyph) {
963 this->generateMetrics(glyph);
966 void SkScalerContext_Mac::generateMetrics(SkGlyph* glyph) {
967 const CGGlyph cgGlyph = (CGGlyph) glyph->getGlyphID(fBaseGlyphCount);
968 glyph->zeroMetrics();
970 // The following block produces cgAdvance in CG units (pixels, y up).
973 CTFontGetAdvancesForGlyphs(fCTVerticalFont, kCTFontVerticalOrientation,
974 &cgGlyph, &cgAdvance, 1);
976 CTFontGetAdvancesForGlyphs(fCTFont, kCTFontHorizontalOrientation,
977 &cgGlyph, &cgAdvance, 1);
979 glyph->fAdvanceX = SkFloatToFixed_Check(cgAdvance.width);
980 glyph->fAdvanceY = -SkFloatToFixed_Check(cgAdvance.height);
982 // The following produces skBounds in SkGlyph units (pixels, y down),
983 // or returns early if skBounds would be empty.
986 // On Mountain Lion, CTFontGetBoundingRectsForGlyphs with kCTFontVerticalOrientation and
987 // CTFontGetVerticalTranslationsForGlyphs do not agree when using OTF CFF fonts.
988 // For TTF fonts these two do agree and we can use CTFontGetBoundingRectsForGlyphs to get
989 // the bounding box and CTFontGetVerticalTranslationsForGlyphs to then draw the glyph
990 // inside that bounding box. However, with OTF CFF fonts this does not work. It appears that
991 // CTFontGetBoundingRectsForGlyphs with kCTFontVerticalOrientation on OTF CFF fonts tries
992 // to center the glyph along the vertical baseline and also perform some mysterious shift
993 // along the baseline. CTFontGetVerticalTranslationsForGlyphs does not appear to perform
996 // It is not known which is correct (or if either is correct). However, we must always draw
997 // from the horizontal origin and must use CTFontGetVerticalTranslationsForGlyphs to draw.
998 // As a result, we do not call CTFontGetBoundingRectsForGlyphs for vertical glyphs.
1000 // On Snow Leopard, CTFontGetBoundingRectsForGlyphs ignores kCTFontVerticalOrientation and
1001 // returns horizontal bounds.
1003 // On Lion and Mountain Lion, CTFontGetBoundingRectsForGlyphs has a bug which causes it to
1004 // return a bad value in cgBounds.origin.x for SFNT fonts whose hhea::numberOfHMetrics is
1005 // less than its maxp::numGlyphs. When this is the case we try to read the bounds from the
1007 if ((isLion() || isMountainLion()) &&
1008 (cgGlyph < fGlyphCount && cgGlyph >= getFBoundingBoxesGlyphOffset() && generateBBoxes()))
1010 const GlyphRect& gRect = fFBoundingBoxes[cgGlyph - fFBoundingBoxesGlyphOffset];
1011 if (gRect.fMinX >= gRect.fMaxX || gRect.fMinY >= gRect.fMaxY) {
1014 skBounds = SkRect::MakeLTRB(gRect.fMinX, gRect.fMinY, gRect.fMaxX, gRect.fMaxY);
1015 // From FUnits (em space, y up) to SkGlyph units (pixels, y down).
1016 fFUnitMatrix.mapRect(&skBounds);
1019 // CTFontGetBoundingRectsForGlyphs produces cgBounds in CG units (pixels, y up).
1021 CTFontGetBoundingRectsForGlyphs(fCTFont, kCTFontHorizontalOrientation,
1022 &cgGlyph, &cgBounds, 1);
1025 // 0x200B (zero-advance space) seems to return a huge (garbage) bounds, when
1026 // it should be empty. So, if we see a zero-advance, we check if it has an
1027 // empty path or not, and if so, we jam the bounds to 0. Hopefully a zero-advance
1028 // is rare, so we won't incur a big performance cost for this extra check.
1029 if (0 == cgAdvance.width && 0 == cgAdvance.height) {
1030 AutoCFRelease<CGPathRef> path(CTFontCreatePathForGlyph(fCTFont, cgGlyph, NULL));
1031 if (NULL == path || CGPathIsEmpty(path)) {
1036 if (CGRectIsEmpty_inline(cgBounds)) {
1040 // Convert cgBounds to SkGlyph units (pixels, y down).
1041 skBounds = SkRect::MakeXYWH(cgBounds.origin.x, -cgBounds.origin.y - cgBounds.size.height,
1042 cgBounds.size.width, cgBounds.size.height);
1046 // Due to all of the vertical bounds bugs, skBounds is always the horizontal bounds.
1047 // Convert these horizontal bounds into vertical bounds.
1049 getVerticalOffset(cgGlyph, &offset);
1050 skBounds.offset(offset);
1053 // Currently the bounds are based on being rendered at (0,0).
1054 // The top left must not move, since that is the base from which subpixel positioning is offset.
1055 if (fDoSubPosition) {
1056 skBounds.fRight += SkFixedToFloat(glyph->getSubXFixed());
1057 skBounds.fBottom += SkFixedToFloat(glyph->getSubYFixed());
1061 skBounds.roundOut(&skIBounds);
1062 // Expand the bounds by 1 pixel, to give CG room for anti-aliasing.
1063 // Note that this outset is to allow room for LCD smoothed glyphs. However, the correct outset
1064 // is not currently known, as CG dilates the outlines by some percentage.
1065 // Note that if this context is A8 and not back-forming from LCD, there is no need to outset.
1066 skIBounds.outset(1, 1);
1067 glyph->fLeft = SkToS16(skIBounds.fLeft);
1068 glyph->fTop = SkToS16(skIBounds.fTop);
1069 glyph->fWidth = SkToU16(skIBounds.width());
1070 glyph->fHeight = SkToU16(skIBounds.height());
1072 #ifdef HACK_COLORGLYPHS
1073 glyph->fMaskFormat = SkMask::kARGB32_Format;
1077 #include "SkColorPriv.h"
1079 static void build_power_table(uint8_t table[], float ee) {
1080 for (int i = 0; i < 256; i++) {
1081 float x = i / 255.f;
1082 x = sk_float_pow(x, ee);
1083 int xx = SkScalarRoundToInt(SkFloatToScalar(x * 255));
1084 table[i] = SkToU8(xx);
1089 * This will invert the gamma applied by CoreGraphics, so we can get linear
1092 * CoreGraphics obscurely defaults to 2.0 as the smoothing gamma value.
1093 * The color space used does not appear to affect this choice.
1095 static const uint8_t* getInverseGammaTableCoreGraphicSmoothing() {
1096 static bool gInited;
1097 static uint8_t gTableCoreGraphicsSmoothing[256];
1099 build_power_table(gTableCoreGraphicsSmoothing, 2.0f);
1102 return gTableCoreGraphicsSmoothing;
1105 static void cgpixels_to_bits(uint8_t dst[], const CGRGBPixel src[], int count) {
1108 for (int i = 7; i >= 0; --i) {
1109 mask |= (CGRGBPixel_getAlpha(*src++) >> 7) << i;
1118 template<bool APPLY_PREBLEND>
1119 static inline uint8_t rgb_to_a8(CGRGBPixel rgb, const uint8_t* table8) {
1120 U8CPU r = (rgb >> 16) & 0xFF;
1121 U8CPU g = (rgb >> 8) & 0xFF;
1122 U8CPU b = (rgb >> 0) & 0xFF;
1123 return sk_apply_lut_if<APPLY_PREBLEND>(SkComputeLuminance(r, g, b), table8);
1125 template<bool APPLY_PREBLEND>
1126 static void rgb_to_a8(const CGRGBPixel* SK_RESTRICT cgPixels, size_t cgRowBytes,
1127 const SkGlyph& glyph, const uint8_t* table8) {
1128 const int width = glyph.fWidth;
1129 size_t dstRB = glyph.rowBytes();
1130 uint8_t* SK_RESTRICT dst = (uint8_t*)glyph.fImage;
1132 for (int y = 0; y < glyph.fHeight; y++) {
1133 for (int i = 0; i < width; ++i) {
1134 dst[i] = rgb_to_a8<APPLY_PREBLEND>(cgPixels[i], table8);
1136 cgPixels = (CGRGBPixel*)((char*)cgPixels + cgRowBytes);
1141 template<bool APPLY_PREBLEND>
1142 static inline uint16_t rgb_to_lcd16(CGRGBPixel rgb, const uint8_t* tableR,
1143 const uint8_t* tableG,
1144 const uint8_t* tableB) {
1145 U8CPU r = sk_apply_lut_if<APPLY_PREBLEND>((rgb >> 16) & 0xFF, tableR);
1146 U8CPU g = sk_apply_lut_if<APPLY_PREBLEND>((rgb >> 8) & 0xFF, tableG);
1147 U8CPU b = sk_apply_lut_if<APPLY_PREBLEND>((rgb >> 0) & 0xFF, tableB);
1148 return SkPack888ToRGB16(r, g, b);
1150 template<bool APPLY_PREBLEND>
1151 static void rgb_to_lcd16(const CGRGBPixel* SK_RESTRICT cgPixels, size_t cgRowBytes, const SkGlyph& glyph,
1152 const uint8_t* tableR, const uint8_t* tableG, const uint8_t* tableB) {
1153 const int width = glyph.fWidth;
1154 size_t dstRB = glyph.rowBytes();
1155 uint16_t* SK_RESTRICT dst = (uint16_t*)glyph.fImage;
1157 for (int y = 0; y < glyph.fHeight; y++) {
1158 for (int i = 0; i < width; i++) {
1159 dst[i] = rgb_to_lcd16<APPLY_PREBLEND>(cgPixels[i], tableR, tableG, tableB);
1161 cgPixels = (CGRGBPixel*)((char*)cgPixels + cgRowBytes);
1162 dst = (uint16_t*)((char*)dst + dstRB);
1166 template<bool APPLY_PREBLEND>
1167 static inline uint32_t rgb_to_lcd32(CGRGBPixel rgb, const uint8_t* tableR,
1168 const uint8_t* tableG,
1169 const uint8_t* tableB) {
1170 U8CPU r = sk_apply_lut_if<APPLY_PREBLEND>((rgb >> 16) & 0xFF, tableR);
1171 U8CPU g = sk_apply_lut_if<APPLY_PREBLEND>((rgb >> 8) & 0xFF, tableG);
1172 U8CPU b = sk_apply_lut_if<APPLY_PREBLEND>((rgb >> 0) & 0xFF, tableB);
1173 return SkPackARGB32(0xFF, r, g, b);
1175 template<bool APPLY_PREBLEND>
1176 static void rgb_to_lcd32(const CGRGBPixel* SK_RESTRICT cgPixels, size_t cgRowBytes, const SkGlyph& glyph,
1177 const uint8_t* tableR, const uint8_t* tableG, const uint8_t* tableB) {
1178 const int width = glyph.fWidth;
1179 size_t dstRB = glyph.rowBytes();
1180 uint32_t* SK_RESTRICT dst = (uint32_t*)glyph.fImage;
1181 for (int y = 0; y < glyph.fHeight; y++) {
1182 for (int i = 0; i < width; i++) {
1183 dst[i] = rgb_to_lcd32<APPLY_PREBLEND>(cgPixels[i], tableR, tableG, tableB);
1185 cgPixels = (CGRGBPixel*)((char*)cgPixels + cgRowBytes);
1186 dst = (uint32_t*)((char*)dst + dstRB);
1190 #ifdef HACK_COLORGLYPHS
1191 // hack to colorize the output for testing kARGB32_Format
1192 static SkPMColor cgpixels_to_pmcolor(CGRGBPixel rgb, const SkGlyph& glyph,
1194 U8CPU r = (rgb >> 16) & 0xFF;
1195 U8CPU g = (rgb >> 8) & 0xFF;
1196 U8CPU b = (rgb >> 0) & 0xFF;
1197 unsigned a = SkComputeLuminance(r, g, b);
1199 // compute gradient from x,y
1200 r = x * 255 / glyph.fWidth;
1202 b = (glyph.fHeight - y) * 255 / glyph.fHeight;
1203 return SkPreMultiplyARGB(a, r, g, b); // red
1207 template <typename T> T* SkTAddByteOffset(T* ptr, size_t byteOffset) {
1208 return (T*)((char*)ptr + byteOffset);
1211 void SkScalerContext_Mac::generateImage(const SkGlyph& glyph) {
1212 CGGlyph cgGlyph = (CGGlyph) glyph.getGlyphID(fBaseGlyphCount);
1214 // FIXME: lcd smoothed un-hinted rasterization unsupported.
1215 bool generateA8FromLCD = fRec.getHinting() != SkPaint::kNo_Hinting;
1219 CGRGBPixel* cgPixels = fOffscreen.getCG(*this, glyph, cgGlyph, &cgRowBytes, generateA8FromLCD);
1220 if (cgPixels == NULL) {
1224 //TODO: see if drawing black on white and inverting is faster (at least in
1225 //lcd case) as core graphics appears to have special case code for drawing
1229 const bool isLCD = isLCDFormat(glyph.fMaskFormat);
1230 if (isLCD || (glyph.fMaskFormat == SkMask::kA8_Format && supports_LCD() && generateA8FromLCD)) {
1231 const uint8_t* table = getInverseGammaTableCoreGraphicSmoothing();
1233 //Note that the following cannot really be integrated into the
1234 //pre-blend, since we may not be applying the pre-blend; when we aren't
1235 //applying the pre-blend it means that a filter wants linear anyway.
1236 //Other code may also be applying the pre-blend, so we'd need another
1237 //one with this and one without.
1238 CGRGBPixel* addr = cgPixels;
1239 for (int y = 0; y < glyph.fHeight; ++y) {
1240 for (int x = 0; x < glyph.fWidth; ++x) {
1241 int r = (addr[x] >> 16) & 0xFF;
1242 int g = (addr[x] >> 8) & 0xFF;
1243 int b = (addr[x] >> 0) & 0xFF;
1244 addr[x] = (table[r] << 16) | (table[g] << 8) | table[b];
1246 addr = SkTAddByteOffset(addr, cgRowBytes);
1250 // Convert glyph to mask
1251 switch (glyph.fMaskFormat) {
1252 case SkMask::kLCD32_Format: {
1253 if (fPreBlend.isApplicable()) {
1254 rgb_to_lcd32<true>(cgPixels, cgRowBytes, glyph,
1255 fPreBlend.fR, fPreBlend.fG, fPreBlend.fB);
1257 rgb_to_lcd32<false>(cgPixels, cgRowBytes, glyph,
1258 fPreBlend.fR, fPreBlend.fG, fPreBlend.fB);
1261 case SkMask::kLCD16_Format: {
1262 if (fPreBlend.isApplicable()) {
1263 rgb_to_lcd16<true>(cgPixels, cgRowBytes, glyph,
1264 fPreBlend.fR, fPreBlend.fG, fPreBlend.fB);
1266 rgb_to_lcd16<false>(cgPixels, cgRowBytes, glyph,
1267 fPreBlend.fR, fPreBlend.fG, fPreBlend.fB);
1270 case SkMask::kA8_Format: {
1271 if (fPreBlend.isApplicable()) {
1272 rgb_to_a8<true>(cgPixels, cgRowBytes, glyph, fPreBlend.fG);
1274 rgb_to_a8<false>(cgPixels, cgRowBytes, glyph, fPreBlend.fG);
1277 case SkMask::kBW_Format: {
1278 const int width = glyph.fWidth;
1279 size_t dstRB = glyph.rowBytes();
1280 uint8_t* dst = (uint8_t*)glyph.fImage;
1281 for (int y = 0; y < glyph.fHeight; y++) {
1282 cgpixels_to_bits(dst, cgPixels, width);
1283 cgPixels = (CGRGBPixel*)((char*)cgPixels + cgRowBytes);
1287 #ifdef HACK_COLORGLYPHS
1288 case SkMask::kARGB32_Format: {
1289 const int width = glyph.fWidth;
1290 size_t dstRB = glyph.rowBytes();
1291 SkPMColor* dst = (SkPMColor*)glyph.fImage;
1292 for (int y = 0; y < glyph.fHeight; y++) {
1293 for (int x = 0; x < width; ++x) {
1294 dst[x] = cgpixels_to_pmcolor(cgPixels[x], glyph, x, y);
1296 cgPixels = (CGRGBPixel*)((char*)cgPixels + cgRowBytes);
1297 dst = (SkPMColor*)((char*)dst + dstRB);
1302 SkDEBUGFAIL("unexpected mask format");
1308 * Our subpixel resolution is only 2 bits in each direction, so a scale of 4
1309 * seems sufficient, and possibly even correct, to allow the hinted outline
1310 * to be subpixel positioned.
1312 #define kScaleForSubPixelPositionHinting (4.0f)
1314 void SkScalerContext_Mac::generatePath(const SkGlyph& glyph, SkPath* path) {
1315 CTFontRef font = fCTFont;
1316 SkScalar scaleX = SK_Scalar1;
1317 SkScalar scaleY = SK_Scalar1;
1320 * For subpixel positioning, we want to return an unhinted outline, so it
1321 * can be positioned nicely at fractional offsets. However, we special-case
1322 * if the baseline of the (horizontal) text is axis-aligned. In those cases
1323 * we want to retain hinting in the direction orthogonal to the baseline.
1324 * e.g. for horizontal baseline, we want to retain hinting in Y.
1325 * The way we remove hinting is to scale the font by some value (4) in that
1326 * direction, ask for the path, and then scale the path back down.
1328 if (fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag) {
1330 fRec.getSingleMatrix(&m);
1332 // start out by assuming that we want no hining in X and Y
1333 scaleX = scaleY = SkFloatToScalar(kScaleForSubPixelPositionHinting);
1334 // now see if we need to restore hinting for axis-aligned baselines
1335 switch (SkComputeAxisAlignmentForHText(m)) {
1336 case kX_SkAxisAlignment:
1337 scaleY = SK_Scalar1; // want hinting in the Y direction
1339 case kY_SkAxisAlignment:
1340 scaleX = SK_Scalar1; // want hinting in the X direction
1346 CGAffineTransform xform = MatrixToCGAffineTransform(m, scaleX, scaleY);
1347 // need to release font when we're done
1348 font = CTFontCreateCopyWithAttributes(fCTFont, 1, &xform, NULL);
1351 CGGlyph cgGlyph = (CGGlyph)glyph.getGlyphID(fBaseGlyphCount);
1352 AutoCFRelease<CGPathRef> cgPath(CTFontCreatePathForGlyph(font, cgGlyph, NULL));
1355 if (cgPath != NULL) {
1356 CGPathApply(cgPath, path, SkScalerContext_Mac::CTPathElement);
1359 if (fDoSubPosition) {
1361 m.setScale(SkScalarInvert(scaleX), SkScalarInvert(scaleY));
1363 // balance the call to CTFontCreateCopyWithAttributes
1364 CFSafeRelease(font);
1368 getVerticalOffset(cgGlyph, &offset);
1369 path->offset(offset.fX, offset.fY);
1373 void SkScalerContext_Mac::generateFontMetrics(SkPaint::FontMetrics* mx,
1374 SkPaint::FontMetrics* my) {
1375 CGRect theBounds = CTFontGetBoundingBox(fCTFont);
1377 SkPaint::FontMetrics theMetrics;
1378 theMetrics.fTop = CGToScalar(-CGRectGetMaxY_inline(theBounds));
1379 theMetrics.fAscent = CGToScalar(-CTFontGetAscent(fCTFont));
1380 theMetrics.fDescent = CGToScalar( CTFontGetDescent(fCTFont));
1381 theMetrics.fBottom = CGToScalar(-CGRectGetMinY_inline(theBounds));
1382 theMetrics.fLeading = CGToScalar( CTFontGetLeading(fCTFont));
1383 theMetrics.fAvgCharWidth = CGToScalar( CGRectGetWidth_inline(theBounds));
1384 theMetrics.fXMin = CGToScalar( CGRectGetMinX_inline(theBounds));
1385 theMetrics.fXMax = CGToScalar( CGRectGetMaxX_inline(theBounds));
1386 theMetrics.fXHeight = CGToScalar( CTFontGetXHeight(fCTFont));
1396 void SkScalerContext_Mac::CTPathElement(void *info, const CGPathElement *element) {
1397 SkPath* skPath = (SkPath*)info;
1399 // Process the path element
1400 switch (element->type) {
1401 case kCGPathElementMoveToPoint:
1402 skPath->moveTo(element->points[0].x, -element->points[0].y);
1405 case kCGPathElementAddLineToPoint:
1406 skPath->lineTo(element->points[0].x, -element->points[0].y);
1409 case kCGPathElementAddQuadCurveToPoint:
1410 skPath->quadTo(element->points[0].x, -element->points[0].y,
1411 element->points[1].x, -element->points[1].y);
1414 case kCGPathElementAddCurveToPoint:
1415 skPath->cubicTo(element->points[0].x, -element->points[0].y,
1416 element->points[1].x, -element->points[1].y,
1417 element->points[2].x, -element->points[2].y);
1420 case kCGPathElementCloseSubpath:
1425 SkDEBUGFAIL("Unknown path element!");
1431 ///////////////////////////////////////////////////////////////////////////////
1433 // Returns NULL on failure
1434 // Call must still manage its ownership of provider
1435 static SkTypeface* create_from_dataProvider(CGDataProviderRef provider) {
1436 AutoCFRelease<CGFontRef> cg(CGFontCreateWithDataProvider(provider));
1440 CTFontRef ct = CTFontCreateWithGraphicsFont(cg, 0, NULL, NULL);
1441 return cg ? SkCreateTypefaceFromCTFont(ct) : NULL;
1444 // Web fonts added to the the CTFont registry do not return their character set.
1445 // Iterate through the font in this case. The existing caller caches the result,
1446 // so the performance impact isn't too bad.
1447 static void populate_glyph_to_unicode_slow(CTFontRef ctFont, CFIndex glyphCount,
1448 SkTDArray<SkUnichar>* glyphToUnicode) {
1449 glyphToUnicode->setCount(glyphCount);
1450 SkUnichar* out = glyphToUnicode->begin();
1451 sk_bzero(out, glyphCount * sizeof(SkUnichar));
1452 UniChar unichar = 0;
1453 while (glyphCount > 0) {
1455 if (CTFontGetGlyphsForCharacters(ctFont, &unichar, &glyph, 1)) {
1456 out[glyph] = unichar;
1459 if (++unichar == 0) {
1465 // Construct Glyph to Unicode table.
1466 // Unicode code points that require conjugate pairs in utf16 are not
1468 static void populate_glyph_to_unicode(CTFontRef ctFont, CFIndex glyphCount,
1469 SkTDArray<SkUnichar>* glyphToUnicode) {
1470 AutoCFRelease<CFCharacterSetRef> charSet(CTFontCopyCharacterSet(ctFont));
1472 populate_glyph_to_unicode_slow(ctFont, glyphCount, glyphToUnicode);
1476 AutoCFRelease<CFDataRef> bitmap(CFCharacterSetCreateBitmapRepresentation(kCFAllocatorDefault,
1481 CFIndex length = CFDataGetLength(bitmap);
1485 if (length > 8192) {
1486 // TODO: Add support for Unicode above 0xFFFF
1487 // Consider only the BMP portion of the Unicode character points.
1488 // The bitmap may contain other planes, up to plane 16.
1489 // See http://developer.apple.com/library/ios/#documentation/CoreFoundation/Reference/CFCharacterSetRef/Reference/reference.html
1492 const UInt8* bits = CFDataGetBytePtr(bitmap);
1493 glyphToUnicode->setCount(glyphCount);
1494 SkUnichar* out = glyphToUnicode->begin();
1495 sk_bzero(out, glyphCount * sizeof(SkUnichar));
1496 for (int i = 0; i < length; i++) {
1501 for (int j = 0; j < 8; j++) {
1503 UniChar unichar = static_cast<UniChar>((i << 3) + j);
1504 if (mask & (1 << j) && CTFontGetGlyphsForCharacters(ctFont, &unichar, &glyph, 1)) {
1505 out[glyph] = unichar;
1511 static bool getWidthAdvance(CTFontRef ctFont, int gId, int16_t* data) {
1514 CGGlyph glyph = gId;
1515 CTFontGetAdvancesForGlyphs(ctFont, kCTFontHorizontalOrientation, &glyph, &advance, 1);
1516 *data = sk_float_round2int(advance.width);
1520 // we might move this into our CGUtils...
1521 static void CFStringToSkString(CFStringRef src, SkString* dst) {
1522 // Reserve enough room for the worst-case string,
1523 // plus 1 byte for the trailing null.
1524 CFIndex length = CFStringGetMaximumSizeForEncoding(CFStringGetLength(src),
1525 kCFStringEncodingUTF8) + 1;
1526 dst->resize(length);
1527 CFStringGetCString(src, dst->writable_str(), length, kCFStringEncodingUTF8);
1528 // Resize to the actual UTF-8 length used, stripping the null character.
1529 dst->resize(strlen(dst->c_str()));
1532 SkAdvancedTypefaceMetrics* SkTypeface_Mac::onGetAdvancedTypefaceMetrics(
1533 SkAdvancedTypefaceMetrics::PerGlyphInfo perGlyphInfo,
1534 const uint32_t* glyphIDs,
1535 uint32_t glyphIDsCount) const {
1537 CTFontRef originalCTFont = fFontRef.get();
1538 AutoCFRelease<CTFontRef> ctFont(CTFontCreateCopyWithAttributes(
1539 originalCTFont, CTFontGetUnitsPerEm(originalCTFont), NULL, NULL));
1540 SkAdvancedTypefaceMetrics* info = new SkAdvancedTypefaceMetrics;
1543 AutoCFRelease<CFStringRef> fontName(CTFontCopyPostScriptName(ctFont));
1544 CFStringToSkString(fontName, &info->fFontName);
1547 info->fMultiMaster = false;
1548 CFIndex glyphCount = CTFontGetGlyphCount(ctFont);
1549 info->fLastGlyphID = SkToU16(glyphCount - 1);
1550 info->fEmSize = CTFontGetUnitsPerEm(ctFont);
1552 if (perGlyphInfo & SkAdvancedTypefaceMetrics::kToUnicode_PerGlyphInfo) {
1553 populate_glyph_to_unicode(ctFont, glyphCount, &info->fGlyphToUnicode);
1558 // If it's not a truetype font, mark it as 'other'. Assume that TrueType
1559 // fonts always have both glyf and loca tables. At the least, this is what
1560 // sfntly needs to subset the font. CTFontCopyAttribute() does not always
1561 // succeed in determining this directly.
1562 if (!this->getTableSize('glyf') || !this->getTableSize('loca')) {
1563 info->fType = SkAdvancedTypefaceMetrics::kOther_Font;
1564 info->fItalicAngle = 0;
1568 info->fCapHeight = 0;
1569 info->fBBox = SkIRect::MakeEmpty();
1573 info->fType = SkAdvancedTypefaceMetrics::kTrueType_Font;
1574 CTFontSymbolicTraits symbolicTraits = CTFontGetSymbolicTraits(ctFont);
1575 if (symbolicTraits & kCTFontMonoSpaceTrait) {
1576 info->fStyle |= SkAdvancedTypefaceMetrics::kFixedPitch_Style;
1578 if (symbolicTraits & kCTFontItalicTrait) {
1579 info->fStyle |= SkAdvancedTypefaceMetrics::kItalic_Style;
1581 CTFontStylisticClass stylisticClass = symbolicTraits & kCTFontClassMaskTrait;
1582 if (stylisticClass >= kCTFontOldStyleSerifsClass && stylisticClass <= kCTFontSlabSerifsClass) {
1583 info->fStyle |= SkAdvancedTypefaceMetrics::kSerif_Style;
1584 } else if (stylisticClass & kCTFontScriptsClass) {
1585 info->fStyle |= SkAdvancedTypefaceMetrics::kScript_Style;
1587 info->fItalicAngle = (int16_t) CTFontGetSlantAngle(ctFont);
1588 info->fAscent = (int16_t) CTFontGetAscent(ctFont);
1589 info->fDescent = (int16_t) CTFontGetDescent(ctFont);
1590 info->fCapHeight = (int16_t) CTFontGetCapHeight(ctFont);
1591 CGRect bbox = CTFontGetBoundingBox(ctFont);
1594 r.set( CGToScalar(CGRectGetMinX_inline(bbox)), // Left
1595 CGToScalar(CGRectGetMaxY_inline(bbox)), // Top
1596 CGToScalar(CGRectGetMaxX_inline(bbox)), // Right
1597 CGToScalar(CGRectGetMinY_inline(bbox))); // Bottom
1599 r.roundOut(&(info->fBBox));
1601 // Figure out a good guess for StemV - Min width of i, I, !, 1.
1602 // This probably isn't very good with an italic font.
1603 int16_t min_width = SHRT_MAX;
1605 static const UniChar stem_chars[] = {'i', 'I', '!', '1'};
1606 const size_t count = sizeof(stem_chars) / sizeof(stem_chars[0]);
1607 CGGlyph glyphs[count];
1608 CGRect boundingRects[count];
1609 if (CTFontGetGlyphsForCharacters(ctFont, stem_chars, glyphs, count)) {
1610 CTFontGetBoundingRectsForGlyphs(ctFont, kCTFontHorizontalOrientation,
1611 glyphs, boundingRects, count);
1612 for (size_t i = 0; i < count; i++) {
1613 int16_t width = (int16_t) boundingRects[i].size.width;
1614 if (width > 0 && width < min_width) {
1616 info->fStemV = min_width;
1621 if (false) { // TODO: haven't figured out how to know if font is embeddable
1622 // (information is in the OS/2 table)
1623 info->fType = SkAdvancedTypefaceMetrics::kNotEmbeddable_Font;
1624 } else if (perGlyphInfo & SkAdvancedTypefaceMetrics::kHAdvance_PerGlyphInfo) {
1625 if (info->fStyle & SkAdvancedTypefaceMetrics::kFixedPitch_Style) {
1626 skia_advanced_typeface_metrics_utils::appendRange(&info->fGlyphWidths, 0);
1627 info->fGlyphWidths->fAdvance.append(1, &min_width);
1628 skia_advanced_typeface_metrics_utils::finishRange(info->fGlyphWidths.get(), 0,
1629 SkAdvancedTypefaceMetrics::WidthRange::kDefault);
1631 info->fGlyphWidths.reset(
1632 skia_advanced_typeface_metrics_utils::getAdvanceData(ctFont.get(),
1642 ///////////////////////////////////////////////////////////////////////////////
1644 static SK_SFNT_ULONG get_font_type_tag(const SkTypeface_Mac* typeface) {
1645 CTFontRef ctFont = typeface->fFontRef.get();
1646 AutoCFRelease<CFNumberRef> fontFormatRef(
1647 static_cast<CFNumberRef>(CTFontCopyAttribute(ctFont, kCTFontFormatAttribute)));
1648 if (!fontFormatRef) {
1652 SInt32 fontFormatValue;
1653 if (!CFNumberGetValue(fontFormatRef, kCFNumberSInt32Type, &fontFormatValue)) {
1657 switch (fontFormatValue) {
1658 case kCTFontFormatOpenTypePostScript:
1659 return SkSFNTHeader::fontType_OpenTypeCFF::TAG;
1660 case kCTFontFormatOpenTypeTrueType:
1661 return SkSFNTHeader::fontType_WindowsTrueType::TAG;
1662 case kCTFontFormatTrueType:
1663 return SkSFNTHeader::fontType_MacTrueType::TAG;
1664 case kCTFontFormatPostScript:
1665 return SkSFNTHeader::fontType_PostScript::TAG;
1666 case kCTFontFormatBitmap:
1667 return SkSFNTHeader::fontType_MacTrueType::TAG;
1668 case kCTFontFormatUnrecognized:
1670 //CT seems to be unreliable in being able to obtain the type,
1671 //even if all we want is the first four bytes of the font resource.
1672 //Just the presence of the FontForge 'FFTM' table seems to throw it off.
1673 return SkSFNTHeader::fontType_WindowsTrueType::TAG;
1677 SkStream* SkTypeface_Mac::onOpenStream(int* ttcIndex) const {
1678 SK_SFNT_ULONG fontType = get_font_type_tag(this);
1679 if (0 == fontType) {
1684 int numTables = this->countTables();
1685 SkTDArray<SkFontTableTag> tableTags;
1686 tableTags.setCount(numTables);
1687 this->getTableTags(tableTags.begin());
1689 // calc total size for font, save sizes
1690 SkTDArray<size_t> tableSizes;
1691 size_t totalSize = sizeof(SkSFNTHeader) + sizeof(SkSFNTHeader::TableDirectoryEntry) * numTables;
1692 for (int tableIndex = 0; tableIndex < numTables; ++tableIndex) {
1693 size_t tableSize = this->getTableSize(tableTags[tableIndex]);
1694 totalSize += (tableSize + 3) & ~3;
1695 *tableSizes.append() = tableSize;
1698 // reserve memory for stream, and zero it (tables must be zero padded)
1699 SkMemoryStream* stream = new SkMemoryStream(totalSize);
1700 char* dataStart = (char*)stream->getMemoryBase();
1701 sk_bzero(dataStart, totalSize);
1702 char* dataPtr = dataStart;
1704 // compute font header entries
1705 uint16_t entrySelector = 0;
1706 uint16_t searchRange = 1;
1707 while (searchRange < numTables >> 1) {
1712 uint16_t rangeShift = (numTables << 4) - searchRange;
1714 // write font header
1715 SkSFNTHeader* header = (SkSFNTHeader*)dataPtr;
1716 header->fontType = fontType;
1717 header->numTables = SkEndian_SwapBE16(numTables);
1718 header->searchRange = SkEndian_SwapBE16(searchRange);
1719 header->entrySelector = SkEndian_SwapBE16(entrySelector);
1720 header->rangeShift = SkEndian_SwapBE16(rangeShift);
1721 dataPtr += sizeof(SkSFNTHeader);
1724 SkSFNTHeader::TableDirectoryEntry* entry = (SkSFNTHeader::TableDirectoryEntry*)dataPtr;
1725 dataPtr += sizeof(SkSFNTHeader::TableDirectoryEntry) * numTables;
1726 for (int tableIndex = 0; tableIndex < numTables; ++tableIndex) {
1727 size_t tableSize = tableSizes[tableIndex];
1728 this->getTableData(tableTags[tableIndex], 0, tableSize, dataPtr);
1729 entry->tag = SkEndian_SwapBE32(tableTags[tableIndex]);
1730 entry->checksum = SkEndian_SwapBE32(SkOTUtils::CalcTableChecksum((SK_OT_ULONG*)dataPtr,
1732 entry->offset = SkEndian_SwapBE32(dataPtr - dataStart);
1733 entry->logicalLength = SkEndian_SwapBE32(tableSize);
1735 dataPtr += (tableSize + 3) & ~3;
1742 ///////////////////////////////////////////////////////////////////////////////
1743 ///////////////////////////////////////////////////////////////////////////////
1745 int SkTypeface_Mac::onGetUPEM() const {
1746 AutoCFRelease<CGFontRef> cgFont(CTFontCopyGraphicsFont(fFontRef, NULL));
1747 return CGFontGetUnitsPerEm(cgFont);
1750 SkTypeface::LocalizedStrings* SkTypeface_Mac::onCreateFamilyNameIterator() const {
1751 SkTypeface::LocalizedStrings* nameIter =
1752 SkOTUtils::LocalizedStrings_NameTable::CreateForFamilyNames(*this);
1753 if (NULL == nameIter) {
1754 AutoCFRelease<CFStringRef> cfLanguage;
1755 AutoCFRelease<CFStringRef> cfFamilyName(
1756 CTFontCopyLocalizedName(fFontRef, kCTFontFamilyNameKey, &cfLanguage));
1758 SkString skLanguage;
1759 SkString skFamilyName;
1760 if (cfLanguage.get()) {
1761 CFStringToSkString(cfLanguage.get(), &skLanguage);
1763 skLanguage = "und"; //undetermined
1765 if (cfFamilyName.get()) {
1766 CFStringToSkString(cfFamilyName.get(), &skFamilyName);
1769 nameIter = new SkOTUtils::LocalizedStrings_SingleName(skFamilyName, skLanguage);
1774 // If, as is the case with web fonts, the CTFont data isn't available,
1775 // the CGFont data may work. While the CGFont may always provide the
1776 // right result, leave the CTFont code path to minimize disruption.
1777 static CFDataRef copyTableFromFont(CTFontRef ctFont, SkFontTableTag tag) {
1778 CFDataRef data = CTFontCopyTable(ctFont, (CTFontTableTag) tag,
1779 kCTFontTableOptionNoOptions);
1781 AutoCFRelease<CGFontRef> cgFont(CTFontCopyGraphicsFont(ctFont, NULL));
1782 data = CGFontCopyTableForTag(cgFont, tag);
1787 int SkTypeface_Mac::onGetTableTags(SkFontTableTag tags[]) const {
1788 AutoCFRelease<CFArrayRef> cfArray(CTFontCopyAvailableTables(fFontRef,
1789 kCTFontTableOptionNoOptions));
1790 if (NULL == cfArray) {
1793 int count = CFArrayGetCount(cfArray);
1795 for (int i = 0; i < count; ++i) {
1796 uintptr_t fontTag = reinterpret_cast<uintptr_t>(CFArrayGetValueAtIndex(cfArray, i));
1797 tags[i] = static_cast<SkFontTableTag>(fontTag);
1803 size_t SkTypeface_Mac::onGetTableData(SkFontTableTag tag, size_t offset,
1804 size_t length, void* dstData) const {
1805 AutoCFRelease<CFDataRef> srcData(copyTableFromFont(fFontRef, tag));
1806 if (NULL == srcData) {
1810 size_t srcSize = CFDataGetLength(srcData);
1811 if (offset >= srcSize) {
1814 if (length > srcSize - offset) {
1815 length = srcSize - offset;
1818 memcpy(dstData, CFDataGetBytePtr(srcData) + offset, length);
1823 SkScalerContext* SkTypeface_Mac::onCreateScalerContext(const SkDescriptor* desc) const {
1824 return new SkScalerContext_Mac(const_cast<SkTypeface_Mac*>(this), desc);
1827 void SkTypeface_Mac::onFilterRec(SkScalerContextRec* rec) const {
1828 if (rec->fFlags & SkScalerContext::kLCD_BGROrder_Flag ||
1829 rec->fFlags & SkScalerContext::kLCD_Vertical_Flag)
1831 rec->fMaskFormat = SkMask::kA8_Format;
1832 // Render the glyphs as close as possible to what was requested.
1833 // The above turns off subpixel rendering, but the user requested it.
1834 // Normal hinting will cause the A8 masks to be generated from CoreGraphics subpixel masks.
1835 // See comments below for more details.
1836 rec->setHinting(SkPaint::kNormal_Hinting);
1839 unsigned flagsWeDontSupport = SkScalerContext::kDevKernText_Flag |
1840 SkScalerContext::kAutohinting_Flag |
1841 SkScalerContext::kLCD_BGROrder_Flag |
1842 SkScalerContext::kLCD_Vertical_Flag;
1844 rec->fFlags &= ~flagsWeDontSupport;
1846 bool lcdSupport = supports_LCD();
1848 // Only two levels of hinting are supported.
1849 // kNo_Hinting means avoid CoreGraphics outline dilation.
1850 // kNormal_Hinting means CoreGraphics outline dilation is allowed.
1851 // If there is no lcd support, hinting (dilation) cannot be supported.
1852 SkPaint::Hinting hinting = rec->getHinting();
1853 if (SkPaint::kSlight_Hinting == hinting || !lcdSupport) {
1854 hinting = SkPaint::kNo_Hinting;
1855 } else if (SkPaint::kFull_Hinting == hinting) {
1856 hinting = SkPaint::kNormal_Hinting;
1858 rec->setHinting(hinting);
1860 // FIXME: lcd smoothed un-hinted rasterization unsupported.
1861 // Tracked by http://code.google.com/p/skia/issues/detail?id=915 .
1862 // There is no current means to honor a request for unhinted lcd,
1863 // so arbitrarilly ignore the hinting request and honor lcd.
1865 // Hinting and smoothing should be orthogonal, but currently they are not.
1866 // CoreGraphics has no API to influence hinting. However, its lcd smoothed
1867 // output is drawn from auto-dilated outlines (the amount of which is
1868 // determined by AppleFontSmoothing). Its regular anti-aliased output is
1869 // drawn from un-dilated outlines.
1871 // The behavior of Skia is as follows:
1872 // [AA][no-hint]: generate AA using CoreGraphic's AA output.
1873 // [AA][yes-hint]: use CoreGraphic's LCD output and reduce it to a single
1874 // channel. This matches [LCD][yes-hint] in weight.
1875 // [LCD][no-hint]: curently unable to honor, and must pick which to respect.
1876 // Currenly side with LCD, effectively ignoring the hinting setting.
1877 // [LCD][yes-hint]: generate LCD using CoreGraphic's LCD output.
1879 if (isLCDFormat(rec->fMaskFormat)) {
1881 //CoreGraphics creates 555 masks for smoothed text anyway.
1882 rec->fMaskFormat = SkMask::kLCD16_Format;
1883 rec->setHinting(SkPaint::kNormal_Hinting);
1885 rec->fMaskFormat = SkMask::kA8_Format;
1889 // Unhinted A8 masks (those not derived from LCD masks) must respect SK_GAMMA_APPLY_TO_A8.
1890 // All other masks can use regular gamma.
1891 if (SkMask::kA8_Format == rec->fMaskFormat && SkPaint::kNo_Hinting == hinting) {
1892 #ifndef SK_GAMMA_APPLY_TO_A8
1893 rec->ignorePreBlend();
1896 //CoreGraphics dialates smoothed text as needed.
1897 rec->setContrast(0);
1901 // we take ownership of the ref
1902 static const char* get_str(CFStringRef ref, SkString* str) {
1903 CFStringToSkString(ref, str);
1905 return str->c_str();
1908 void SkTypeface_Mac::onGetFontDescriptor(SkFontDescriptor* desc,
1909 bool* isLocalStream) const {
1912 desc->setFamilyName(get_str(CTFontCopyFamilyName(fFontRef), &tmpStr));
1913 desc->setFullName(get_str(CTFontCopyFullName(fFontRef), &tmpStr));
1914 desc->setPostscriptName(get_str(CTFontCopyPostScriptName(fFontRef), &tmpStr));
1915 // TODO: need to add support for local-streams (here and openStream)
1916 *isLocalStream = false;
1919 int SkTypeface_Mac::onCharsToGlyphs(const void* chars, Encoding encoding,
1920 uint16_t glyphs[], int glyphCount) const
1922 // Undocumented behavior of CTFontGetGlyphsForCharacters with non-bmp code points:
1923 // When a surrogate pair is detected, the glyph index used is the index of the high surrogate.
1924 // It is documented that if a mapping is unavailable, the glyph will be set to 0.
1926 SkAutoSTMalloc<1024, UniChar> charStorage;
1927 const UniChar* src; // UniChar is a UTF-16 16-bit code unit.
1930 case kUTF8_Encoding: {
1931 const char* utf8 = reinterpret_cast<const char*>(chars);
1932 UniChar* utf16 = charStorage.reset(2 * glyphCount);
1934 for (int i = 0; i < glyphCount; ++i) {
1935 SkUnichar uni = SkUTF8_NextUnichar(&utf8);
1936 utf16 += SkUTF16_FromUnichar(uni, utf16);
1938 srcCount = utf16 - src;
1941 case kUTF16_Encoding: {
1942 src = reinterpret_cast<const UniChar*>(chars);
1944 for (int i = 0; i < glyphCount; ++i) {
1945 if (SkUTF16_IsHighSurrogate(src[i + extra])) {
1949 srcCount = glyphCount + extra;
1952 case kUTF32_Encoding: {
1953 const SkUnichar* utf32 = reinterpret_cast<const SkUnichar*>(chars);
1954 UniChar* utf16 = charStorage.reset(2 * glyphCount);
1956 for (int i = 0; i < glyphCount; ++i) {
1957 utf16 += SkUTF16_FromUnichar(utf32[i], utf16);
1959 srcCount = utf16 - src;
1964 // If glyphs is NULL, CT still needs glyph storage for finding the first failure.
1965 // Also, if there are any non-bmp code points, the provided 'glyphs' storage will be inadequate.
1966 SkAutoSTMalloc<1024, uint16_t> glyphStorage;
1967 uint16_t* macGlyphs = glyphs;
1968 if (NULL == macGlyphs || srcCount > glyphCount) {
1969 macGlyphs = glyphStorage.reset(srcCount);
1972 bool allEncoded = CTFontGetGlyphsForCharacters(fFontRef, src, macGlyphs, srcCount);
1974 // If there were any non-bmp, then copy and compact.
1975 // If 'glyphs' is NULL, then compact glyphStorage in-place.
1976 // If all are bmp and 'glyphs' is non-NULL, 'glyphs' already contains the compact glyphs.
1977 // If some are non-bmp and 'glyphs' is non-NULL, copy and compact into 'glyphs'.
1978 uint16_t* compactedGlyphs = glyphs;
1979 if (NULL == compactedGlyphs) {
1980 compactedGlyphs = macGlyphs;
1982 if (srcCount > glyphCount) {
1984 for (int i = 0; i < glyphCount; ++i) {
1985 if (SkUTF16_IsHighSurrogate(src[i + extra])) {
1988 compactedGlyphs[i] = macGlyphs[i + extra];
1996 // If we got false, then we need to manually look for first failure.
1997 for (int i = 0; i < glyphCount; ++i) {
1998 if (0 == compactedGlyphs[i]) {
2002 // Odd to get here, as we expected CT to have returned true up front.
2006 int SkTypeface_Mac::onCountGlyphs() const {
2007 return CTFontGetGlyphCount(fFontRef);
2010 ///////////////////////////////////////////////////////////////////////////////
2011 ///////////////////////////////////////////////////////////////////////////////
2014 static bool find_desc_str(CTFontDescriptorRef desc, CFStringRef name, SkString* value) {
2015 AutoCFRelease<CFStringRef> ref((CFStringRef)CTFontDescriptorCopyAttribute(desc, name));
2016 if (NULL == ref.get()) {
2019 CFStringToSkString(ref, value);
2023 static bool find_dict_float(CFDictionaryRef dict, CFStringRef name, float* value) {
2025 return CFDictionaryGetValueIfPresent(dict, name, (const void**)&num)
2026 && CFNumberIsFloatType(num)
2027 && CFNumberGetValue(num, kCFNumberFloatType, value);
2030 #include "SkFontMgr.h"
2032 static int unit_weight_to_fontstyle(float unit) {
2035 value = 100 + (1 + unit) * 300;
2037 value = 400 + unit * 500;
2039 return sk_float_round2int(value);
2042 static int unit_width_to_fontstyle(float unit) {
2045 value = 1 + (1 + unit) * 4;
2047 value = 5 + unit * 4;
2049 return sk_float_round2int(value);
2052 static inline int sqr(int value) {
2053 SkASSERT(SkAbs32(value) < 0x7FFF); // check for overflow
2054 return value * value;
2057 // We normalize each axis (weight, width, italic) to be base-900
2058 static int compute_metric(const SkFontStyle& a, const SkFontStyle& b) {
2059 return sqr(a.weight() - b.weight()) +
2060 sqr((a.width() - b.width()) * 100) +
2061 sqr((a.isItalic() != b.isItalic()) * 900);
2064 static SkFontStyle desc2fontstyle(CTFontDescriptorRef desc) {
2065 AutoCFRelease<CFDictionaryRef> dict(
2066 (CFDictionaryRef)CTFontDescriptorCopyAttribute(desc,
2067 kCTFontTraitsAttribute));
2068 if (NULL == dict.get()) {
2069 return SkFontStyle();
2072 float weight, width, slant;
2073 if (!find_dict_float(dict, kCTFontWeightTrait, &weight)) {
2076 if (!find_dict_float(dict, kCTFontWidthTrait, &width)) {
2079 if (!find_dict_float(dict, kCTFontSlantTrait, &slant)) {
2083 return SkFontStyle(unit_weight_to_fontstyle(weight),
2084 unit_width_to_fontstyle(width),
2085 slant ? SkFontStyle::kItalic_Slant
2086 : SkFontStyle::kUpright_Slant);
2089 struct NameFontStyleRec {
2090 SkString fFamilyName;
2091 SkFontStyle fFontStyle;
2094 static bool nameFontStyleProc(SkTypeface* face, SkTypeface::Style,
2096 SkTypeface_Mac* macFace = (SkTypeface_Mac*)face;
2097 const NameFontStyleRec* rec = (const NameFontStyleRec*)ctx;
2099 return macFace->fFontStyle == rec->fFontStyle &&
2100 macFace->fName == rec->fFamilyName;
2103 static SkTypeface* createFromDesc(CFStringRef cfFamilyName,
2104 CTFontDescriptorRef desc) {
2105 NameFontStyleRec rec;
2106 CFStringToSkString(cfFamilyName, &rec.fFamilyName);
2107 rec.fFontStyle = desc2fontstyle(desc);
2109 SkTypeface* face = SkTypefaceCache::FindByProcAndRef(nameFontStyleProc,
2115 AutoCFRelease<CTFontRef> ctNamed(CTFontCreateWithName(cfFamilyName, 1, NULL));
2116 CTFontRef ctFont = CTFontCreateCopyWithAttributes(ctNamed, 1, NULL, desc);
2117 if (NULL == ctFont) {
2122 CFStringToSkString(cfFamilyName, &str);
2125 (void)computeStyleBits(ctFont, &isFixedPitch);
2126 SkFontID fontID = CTFontRef_to_SkFontID(ctFont);
2128 face = SkNEW_ARGS(SkTypeface_Mac, (rec.fFontStyle, fontID, isFixedPitch,
2129 ctFont, str.c_str()));
2130 SkTypefaceCache::Add(face, face->style());
2134 class SkFontStyleSet_Mac : public SkFontStyleSet {
2136 SkFontStyleSet_Mac(CFStringRef familyName, CTFontDescriptorRef desc)
2137 : fArray(CTFontDescriptorCreateMatchingFontDescriptors(desc, NULL))
2138 , fFamilyName(familyName)
2140 CFRetain(familyName);
2141 if (NULL == fArray) {
2142 fArray = CFArrayCreate(NULL, NULL, 0, NULL);
2144 fCount = CFArrayGetCount(fArray);
2147 virtual ~SkFontStyleSet_Mac() {
2149 CFRelease(fFamilyName);
2152 virtual int count() SK_OVERRIDE {
2156 virtual void getStyle(int index, SkFontStyle* style,
2157 SkString* name) SK_OVERRIDE {
2158 SkASSERT((unsigned)index < (unsigned)fCount);
2159 CTFontDescriptorRef desc = (CTFontDescriptorRef)CFArrayGetValueAtIndex(fArray, index);
2161 *style = desc2fontstyle(desc);
2164 if (!find_desc_str(desc, kCTFontStyleNameAttribute, name)) {
2170 virtual SkTypeface* createTypeface(int index) SK_OVERRIDE {
2171 SkASSERT((unsigned)index < (unsigned)CFArrayGetCount(fArray));
2172 CTFontDescriptorRef desc = (CTFontDescriptorRef)CFArrayGetValueAtIndex(fArray, index);
2174 return createFromDesc(fFamilyName, desc);
2177 virtual SkTypeface* matchStyle(const SkFontStyle& pattern) SK_OVERRIDE {
2181 return createFromDesc(fFamilyName, findMatchingDesc(pattern));
2186 CFStringRef fFamilyName;
2189 CTFontDescriptorRef findMatchingDesc(const SkFontStyle& pattern) const {
2190 int bestMetric = SK_MaxS32;
2191 CTFontDescriptorRef bestDesc = NULL;
2193 for (int i = 0; i < fCount; ++i) {
2194 CTFontDescriptorRef desc = (CTFontDescriptorRef)CFArrayGetValueAtIndex(fArray, i);
2195 int metric = compute_metric(pattern, desc2fontstyle(desc));
2199 if (metric < bestMetric) {
2200 bestMetric = metric;
2209 class SkFontMgr_Mac : public SkFontMgr {
2213 CFStringRef stringAt(int index) const {
2214 SkASSERT((unsigned)index < (unsigned)fCount);
2215 return (CFStringRef)CFArrayGetValueAtIndex(fNames, index);
2219 if (NULL == fNames) {
2220 fNames = SkCTFontManagerCopyAvailableFontFamilyNames();
2221 fCount = fNames ? CFArrayGetCount(fNames) : 0;
2225 static SkFontStyleSet* CreateSet(CFStringRef cfFamilyName) {
2226 AutoCFRelease<CFMutableDictionaryRef> cfAttr(
2227 CFDictionaryCreateMutable(kCFAllocatorDefault, 0,
2228 &kCFTypeDictionaryKeyCallBacks,
2229 &kCFTypeDictionaryValueCallBacks));
2231 CFDictionaryAddValue(cfAttr, kCTFontFamilyNameAttribute, cfFamilyName);
2233 AutoCFRelease<CTFontDescriptorRef> desc(
2234 CTFontDescriptorCreateWithAttributes(cfAttr));
2235 return SkNEW_ARGS(SkFontStyleSet_Mac, (cfFamilyName, desc));
2239 SkFontMgr_Mac() : fCount(0), fNames(NULL) {}
2241 virtual ~SkFontMgr_Mac() {
2242 CFSafeRelease(fNames);
2246 virtual int onCountFamilies() SK_OVERRIDE {
2251 virtual void onGetFamilyName(int index, SkString* familyName) SK_OVERRIDE {
2253 if ((unsigned)index < (unsigned)fCount) {
2254 CFStringToSkString(this->stringAt(index), familyName);
2256 familyName->reset();
2260 virtual SkFontStyleSet* onCreateStyleSet(int index) SK_OVERRIDE {
2262 if ((unsigned)index >= (unsigned)fCount) {
2265 return CreateSet(this->stringAt(index));
2268 virtual SkFontStyleSet* onMatchFamily(const char familyName[]) SK_OVERRIDE {
2269 AutoCFRelease<CFStringRef> cfName(make_CFString(familyName));
2270 return CreateSet(cfName);
2273 virtual SkTypeface* onMatchFamilyStyle(const char familyName[],
2274 const SkFontStyle&) SK_OVERRIDE {
2278 virtual SkTypeface* onMatchFaceStyle(const SkTypeface* familyMember,
2279 const SkFontStyle&) SK_OVERRIDE {
2283 virtual SkTypeface* onCreateFromData(SkData* data,
2284 int ttcIndex) SK_OVERRIDE {
2285 AutoCFRelease<CGDataProviderRef> pr(SkCreateDataProviderFromData(data));
2289 return create_from_dataProvider(pr);
2292 virtual SkTypeface* onCreateFromStream(SkStream* stream,
2293 int ttcIndex) SK_OVERRIDE {
2294 AutoCFRelease<CGDataProviderRef> pr(SkCreateDataProviderFromStream(stream));
2298 return create_from_dataProvider(pr);
2301 virtual SkTypeface* onCreateFromFile(const char path[],
2302 int ttcIndex) SK_OVERRIDE {
2303 AutoCFRelease<CGDataProviderRef> pr(CGDataProviderCreateWithFilename(path));
2307 return create_from_dataProvider(pr);
2310 virtual SkTypeface* onLegacyCreateTypeface(const char familyName[],
2311 unsigned styleBits) SK_OVERRIDE {
2312 return create_typeface(NULL, familyName, (SkTypeface::Style)styleBits);
2316 ///////////////////////////////////////////////////////////////////////////////
2318 #ifndef SK_FONTHOST_USES_FONTMGR
2320 SkTypeface* SkFontHost::CreateTypeface(const SkTypeface* familyFace,
2321 const char familyName[],
2322 SkTypeface::Style style) {
2323 return create_typeface(familyFace, familyName, style);
2326 SkTypeface* SkFontHost::CreateTypefaceFromStream(SkStream* stream) {
2327 AutoCFRelease<CGDataProviderRef> provider(SkCreateDataProviderFromStream(stream));
2328 if (NULL == provider) {
2331 return create_from_dataProvider(provider);
2334 SkTypeface* SkFontHost::CreateTypefaceFromFile(const char path[]) {
2335 AutoCFRelease<CGDataProviderRef> provider(CGDataProviderCreateWithFilename(path));
2336 if (NULL == provider) {
2339 return create_from_dataProvider(provider);
2344 SkFontMgr* SkFontMgr::Factory() {
2345 return SkNEW(SkFontMgr_Mac);