| |
| /* |
| * 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 "SkBitmap.h" |
| #include "SkCanvas.h" |
| #include "SkColorPriv.h" |
| #include "SkDescriptor.h" |
| #include "SkFDot6.h" |
| #include "SkFontHost.h" |
| #include "SkMask.h" |
| #include "SkAdvancedTypefaceMetrics.h" |
| #include "SkScalerContext.h" |
| #include "SkStream.h" |
| #include "SkString.h" |
| #include "SkTemplates.h" |
| #include "SkThread.h" |
| |
| #include <ft2build.h> |
| #include FT_FREETYPE_H |
| #include FT_OUTLINE_H |
| #include FT_SIZES_H |
| #include FT_TRUETYPE_TABLES_H |
| #include FT_TYPE1_TABLES_H |
| #include FT_BITMAP_H |
| // In the past, FT_GlyphSlot_Own_Bitmap was defined in this header file. |
| #include FT_SYNTHESIS_H |
| #include FT_XFREE86_H |
| #ifdef FT_LCD_FILTER_H |
| #include FT_LCD_FILTER_H |
| #endif |
| |
| #ifdef FT_ADVANCES_H |
| #include FT_ADVANCES_H |
| #endif |
| |
| #if 0 |
| // Also include the files by name for build tools which require this. |
| #include <freetype/freetype.h> |
| #include <freetype/ftoutln.h> |
| #include <freetype/ftsizes.h> |
| #include <freetype/tttables.h> |
| #include <freetype/ftadvanc.h> |
| #include <freetype/ftlcdfil.h> |
| #include <freetype/ftbitmap.h> |
| #include <freetype/ftsynth.h> |
| #endif |
| |
| //#define ENABLE_GLYPH_SPEW // for tracing calls |
| //#define DUMP_STRIKE_CREATION |
| |
| //#define SK_GAMMA_APPLY_TO_A8 |
| |
| #ifndef SK_GAMMA_CONTRAST |
| #define SK_GAMMA_CONTRAST 0x66 |
| #endif |
| #ifndef SK_GAMMA_EXPONENT |
| #define SK_GAMMA_EXPONENT 2.2 |
| #endif |
| |
| // hand-tuned value to reduce outline embolden strength |
| #ifndef SK_OUTLINE_EMBOLDEN_DIVISOR |
| #ifdef SK_BUILD_FOR_ANDROID |
| #define SK_OUTLINE_EMBOLDEN_DIVISOR 34 |
| #else |
| #define SK_OUTLINE_EMBOLDEN_DIVISOR 24 |
| #endif |
| #endif |
| |
| |
| #ifdef SK_DEBUG |
| #define SkASSERT_CONTINUE(pred) \ |
| do { \ |
| if (!(pred)) \ |
| SkDebugf("file %s:%d: assert failed '" #pred "'\n", __FILE__, __LINE__); \ |
| } while (false) |
| #else |
| #define SkASSERT_CONTINUE(pred) |
| #endif |
| |
| using namespace skia_advanced_typeface_metrics_utils; |
| |
| static bool isLCD(const SkScalerContext::Rec& rec) { |
| switch (rec.fMaskFormat) { |
| case SkMask::kLCD16_Format: |
| case SkMask::kLCD32_Format: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| ////////////////////////////////////////////////////////////////////////// |
| |
| struct SkFaceRec; |
| |
| SK_DECLARE_STATIC_MUTEX(gFTMutex); |
| static int gFTCount; |
| static FT_Library gFTLibrary; |
| static SkFaceRec* gFaceRecHead; |
| static bool gLCDSupportValid; // true iff |gLCDSupport| has been set. |
| static bool gLCDSupport; // true iff LCD is supported by the runtime. |
| static int gLCDExtra; // number of extra pixels for filtering. |
| |
| static const uint8_t* gGammaTables[2]; |
| |
| ///////////////////////////////////////////////////////////////////////// |
| |
| // See http://freetype.sourceforge.net/freetype2/docs/reference/ft2-bitmap_handling.html#FT_Bitmap_Embolden |
| // This value was chosen by eyeballing the result in Firefox and trying to match it. |
| static const FT_Pos kBitmapEmboldenStrength = 1 << 6; |
| |
| // convert from Skia's fixed (16.16) to FreeType's fixed (26.6) representation |
| static inline int FixedToDot6(SkFixed x) { return x >> 10; } |
| // convert from FreeType's fixed (26.6) to Skia's fixed (16.16) representation |
| static inline SkFixed Dot6ToFixed(int x) { return x << 10; } |
| |
| static bool |
| InitFreetype() { |
| FT_Error err = FT_Init_FreeType(&gFTLibrary); |
| if (err) { |
| return false; |
| } |
| |
| // Setup LCD filtering. This reduces colour fringes for LCD rendered |
| // glyphs. |
| #ifdef FT_LCD_FILTER_H |
| // err = FT_Library_SetLcdFilter(gFTLibrary, FT_LCD_FILTER_DEFAULT); |
| err = FT_Library_SetLcdFilter(gFTLibrary, FT_LCD_FILTER_LIGHT); |
| gLCDSupport = err == 0; |
| if (gLCDSupport) { |
| gLCDExtra = 2; //DEFAULT and LIGHT add one pixel to each side. |
| } |
| #else |
| gLCDSupport = false; |
| #endif |
| gLCDSupportValid = true; |
| |
| return true; |
| } |
| |
| class SkScalerContext_FreeType : public SkScalerContext { |
| public: |
| SkScalerContext_FreeType(const SkDescriptor* desc); |
| virtual ~SkScalerContext_FreeType(); |
| |
| bool success() const { |
| return fFaceRec != NULL && |
| fFTSize != NULL && |
| fFace != NULL; |
| } |
| |
| protected: |
| virtual unsigned generateGlyphCount(); |
| virtual uint16_t generateCharToGlyph(SkUnichar uni); |
| virtual void generateAdvance(SkGlyph* glyph); |
| virtual void generateMetrics(SkGlyph* glyph); |
| virtual void generateImage(const SkGlyph& glyph); |
| virtual void generatePath(const SkGlyph& glyph, SkPath* path); |
| virtual void generateFontMetrics(SkPaint::FontMetrics* mx, |
| SkPaint::FontMetrics* my); |
| virtual SkUnichar generateGlyphToChar(uint16_t glyph); |
| |
| private: |
| SkFaceRec* fFaceRec; |
| FT_Face fFace; // reference to shared face in gFaceRecHead |
| FT_Size fFTSize; // our own copy |
| SkFixed fScaleX, fScaleY; |
| FT_Matrix fMatrix22; |
| uint32_t fLoadGlyphFlags; |
| bool fDoLinearMetrics; |
| bool fUseVertMetrics; |
| |
| FT_Error setupSize(); |
| void emboldenOutline(FT_Outline* outline); |
| void getBBoxForCurrentGlyph(SkGlyph* glyph, FT_BBox* bbox, |
| bool snapToPixelBoundary = false); |
| void updateGlyphIfLCD(SkGlyph* glyph); |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| /////////////////////////////////////////////////////////////////////////// |
| |
| #include "SkStream.h" |
| |
| struct SkFaceRec { |
| SkFaceRec* fNext; |
| FT_Face fFace; |
| FT_StreamRec fFTStream; |
| SkStream* fSkStream; |
| uint32_t fRefCnt; |
| uint32_t fFontID; |
| |
| // assumes ownership of the stream, will call unref() when its done |
| SkFaceRec(SkStream* strm, uint32_t fontID); |
| ~SkFaceRec() { |
| fSkStream->unref(); |
| } |
| }; |
| |
| extern "C" { |
| static unsigned long sk_stream_read(FT_Stream stream, |
| unsigned long offset, |
| unsigned char* buffer, |
| unsigned long count ) { |
| SkStream* str = (SkStream*)stream->descriptor.pointer; |
| |
| if (count) { |
| if (!str->rewind()) { |
| return 0; |
| } else { |
| unsigned long ret; |
| if (offset) { |
| ret = str->read(NULL, offset); |
| if (ret != offset) { |
| return 0; |
| } |
| } |
| ret = str->read(buffer, count); |
| if (ret != count) { |
| return 0; |
| } |
| count = ret; |
| } |
| } |
| return count; |
| } |
| |
| static void sk_stream_close( FT_Stream stream) {} |
| } |
| |
| SkFaceRec::SkFaceRec(SkStream* strm, uint32_t fontID) |
| : fSkStream(strm), fFontID(fontID) { |
| // SkDEBUGF(("SkFaceRec: opening %s (%p)\n", key.c_str(), strm)); |
| |
| sk_bzero(&fFTStream, sizeof(fFTStream)); |
| fFTStream.size = fSkStream->getLength(); |
| fFTStream.descriptor.pointer = fSkStream; |
| fFTStream.read = sk_stream_read; |
| fFTStream.close = sk_stream_close; |
| } |
| |
| // Will return 0 on failure |
| static SkFaceRec* ref_ft_face(uint32_t fontID) { |
| SkFaceRec* rec = gFaceRecHead; |
| while (rec) { |
| if (rec->fFontID == fontID) { |
| SkASSERT(rec->fFace); |
| rec->fRefCnt += 1; |
| return rec; |
| } |
| rec = rec->fNext; |
| } |
| |
| SkStream* strm = SkFontHost::OpenStream(fontID); |
| if (NULL == strm) { |
| SkDEBUGF(("SkFontHost::OpenStream failed opening %x\n", fontID)); |
| return 0; |
| } |
| |
| // this passes ownership of strm to the rec |
| rec = SkNEW_ARGS(SkFaceRec, (strm, fontID)); |
| |
| FT_Open_Args args; |
| memset(&args, 0, sizeof(args)); |
| const void* memoryBase = strm->getMemoryBase(); |
| |
| if (NULL != memoryBase) { |
| //printf("mmap(%s)\n", keyString.c_str()); |
| args.flags = FT_OPEN_MEMORY; |
| args.memory_base = (const FT_Byte*)memoryBase; |
| args.memory_size = strm->getLength(); |
| } else { |
| //printf("fopen(%s)\n", keyString.c_str()); |
| args.flags = FT_OPEN_STREAM; |
| args.stream = &rec->fFTStream; |
| } |
| |
| int face_index; |
| int length = SkFontHost::GetFileName(fontID, NULL, 0, &face_index); |
| FT_Error err = FT_Open_Face(gFTLibrary, &args, length ? face_index : 0, |
| &rec->fFace); |
| |
| if (err) { // bad filename, try the default font |
| fprintf(stderr, "ERROR: unable to open font '%x'\n", fontID); |
| SkDELETE(rec); |
| return 0; |
| } else { |
| SkASSERT(rec->fFace); |
| //fprintf(stderr, "Opened font '%s'\n", filename.c_str()); |
| rec->fNext = gFaceRecHead; |
| gFaceRecHead = rec; |
| rec->fRefCnt = 1; |
| return rec; |
| } |
| } |
| |
| static void unref_ft_face(FT_Face face) { |
| SkFaceRec* rec = gFaceRecHead; |
| SkFaceRec* prev = NULL; |
| while (rec) { |
| SkFaceRec* next = rec->fNext; |
| if (rec->fFace == face) { |
| if (--rec->fRefCnt == 0) { |
| if (prev) { |
| prev->fNext = next; |
| } else { |
| gFaceRecHead = next; |
| } |
| FT_Done_Face(face); |
| SkDELETE(rec); |
| } |
| return; |
| } |
| prev = rec; |
| rec = next; |
| } |
| SkDEBUGFAIL("shouldn't get here, face not in list"); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////// |
| |
| // Work around for old versions of freetype. |
| static FT_Error getAdvances(FT_Face face, FT_UInt start, FT_UInt count, |
| FT_Int32 loadFlags, FT_Fixed* advances) { |
| #ifdef FT_ADVANCES_H |
| return FT_Get_Advances(face, start, count, loadFlags, advances); |
| #else |
| if (!face || start >= face->num_glyphs || |
| start + count > face->num_glyphs || loadFlags != FT_LOAD_NO_SCALE) { |
| return 6; // "Invalid argument." |
| } |
| if (count == 0) |
| return 0; |
| |
| for (int i = 0; i < count; i++) { |
| FT_Error err = FT_Load_Glyph(face, start + i, FT_LOAD_NO_SCALE); |
| if (err) |
| return err; |
| advances[i] = face->glyph->advance.x; |
| } |
| |
| return 0; |
| #endif |
| } |
| |
| static bool canEmbed(FT_Face face) { |
| #ifdef FT_FSTYPE_RESTRICTED_LICENSE_EMBEDDING |
| FT_UShort fsType = FT_Get_FSType_Flags(face); |
| return (fsType & (FT_FSTYPE_RESTRICTED_LICENSE_EMBEDDING | |
| FT_FSTYPE_BITMAP_EMBEDDING_ONLY)) == 0; |
| #else |
| // No embedding is 0x2 and bitmap embedding only is 0x200. |
| TT_OS2* os2_table; |
| if ((os2_table = (TT_OS2*)FT_Get_Sfnt_Table(face, ft_sfnt_os2)) != NULL) { |
| return (os2_table->fsType & 0x202) == 0; |
| } |
| return false; // We tried, fail safe. |
| #endif |
| } |
| |
| static bool GetLetterCBox(FT_Face face, char letter, FT_BBox* bbox) { |
| const FT_UInt glyph_id = FT_Get_Char_Index(face, letter); |
| if (!glyph_id) |
| return false; |
| FT_Load_Glyph(face, glyph_id, FT_LOAD_NO_SCALE); |
| FT_Outline_Get_CBox(&face->glyph->outline, bbox); |
| return true; |
| } |
| |
| static bool getWidthAdvance(FT_Face face, int gId, int16_t* data) { |
| FT_Fixed advance = 0; |
| if (getAdvances(face, gId, 1, FT_LOAD_NO_SCALE, &advance)) { |
| return false; |
| } |
| SkASSERT(data); |
| *data = advance; |
| return true; |
| } |
| |
| static void populate_glyph_to_unicode(FT_Face& face, |
| SkTDArray<SkUnichar>* glyphToUnicode) { |
| // Check and see if we have Unicode cmaps. |
| for (int i = 0; i < face->num_charmaps; ++i) { |
| // CMaps known to support Unicode: |
| // Platform ID Encoding ID Name |
| // ----------- ----------- ----------------------------------- |
| // 0 0,1 Apple Unicode |
| // 0 3 Apple Unicode 2.0 (preferred) |
| // 3 1 Microsoft Unicode UCS-2 |
| // 3 10 Microsoft Unicode UCS-4 (preferred) |
| // |
| // See Apple TrueType Reference Manual |
| // http://developer.apple.com/fonts/TTRefMan/RM06/Chap6cmap.html |
| // http://developer.apple.com/fonts/TTRefMan/RM06/Chap6name.html#ID |
| // Microsoft OpenType Specification |
| // http://www.microsoft.com/typography/otspec/cmap.htm |
| |
| FT_UShort platformId = face->charmaps[i]->platform_id; |
| FT_UShort encodingId = face->charmaps[i]->encoding_id; |
| |
| if (platformId != 0 && platformId != 3) { |
| continue; |
| } |
| if (platformId == 3 && encodingId != 1 && encodingId != 10) { |
| continue; |
| } |
| bool preferredMap = ((platformId == 3 && encodingId == 10) || |
| (platformId == 0 && encodingId == 3)); |
| |
| FT_Set_Charmap(face, face->charmaps[i]); |
| if (glyphToUnicode->isEmpty()) { |
| glyphToUnicode->setCount(face->num_glyphs); |
| memset(glyphToUnicode->begin(), 0, |
| sizeof(SkUnichar) * face->num_glyphs); |
| } |
| |
| // Iterate through each cmap entry. |
| FT_UInt glyphIndex; |
| for (SkUnichar charCode = FT_Get_First_Char(face, &glyphIndex); |
| glyphIndex != 0; |
| charCode = FT_Get_Next_Char(face, charCode, &glyphIndex)) { |
| if (charCode && |
| ((*glyphToUnicode)[glyphIndex] == 0 || preferredMap)) { |
| (*glyphToUnicode)[glyphIndex] = charCode; |
| } |
| } |
| } |
| } |
| |
| // static |
| SkAdvancedTypefaceMetrics* SkFontHost::GetAdvancedTypefaceMetrics( |
| uint32_t fontID, |
| SkAdvancedTypefaceMetrics::PerGlyphInfo perGlyphInfo, |
| const uint32_t* glyphIDs, |
| uint32_t glyphIDsCount) { |
| #if defined(SK_BUILD_FOR_MAC) |
| return NULL; |
| #else |
| SkAutoMutexAcquire ac(gFTMutex); |
| FT_Library libInit = NULL; |
| if (gFTCount == 0) { |
| if (!InitFreetype()) |
| sk_throw(); |
| libInit = gFTLibrary; |
| } |
| SkAutoTCallIProc<struct FT_LibraryRec_, FT_Done_FreeType> ftLib(libInit); |
| SkFaceRec* rec = ref_ft_face(fontID); |
| if (NULL == rec) |
| return NULL; |
| FT_Face face = rec->fFace; |
| |
| SkAdvancedTypefaceMetrics* info = new SkAdvancedTypefaceMetrics; |
| info->fFontName.set(FT_Get_Postscript_Name(face)); |
| info->fMultiMaster = FT_HAS_MULTIPLE_MASTERS(face); |
| info->fLastGlyphID = face->num_glyphs - 1; |
| info->fEmSize = 1000; |
| |
| bool cid = false; |
| const char* fontType = FT_Get_X11_Font_Format(face); |
| if (strcmp(fontType, "Type 1") == 0) { |
| info->fType = SkAdvancedTypefaceMetrics::kType1_Font; |
| } else if (strcmp(fontType, "CID Type 1") == 0) { |
| info->fType = SkAdvancedTypefaceMetrics::kType1CID_Font; |
| cid = true; |
| } else if (strcmp(fontType, "CFF") == 0) { |
| info->fType = SkAdvancedTypefaceMetrics::kCFF_Font; |
| } else if (strcmp(fontType, "TrueType") == 0) { |
| info->fType = SkAdvancedTypefaceMetrics::kTrueType_Font; |
| cid = true; |
| TT_Header* ttHeader; |
| if ((ttHeader = (TT_Header*)FT_Get_Sfnt_Table(face, |
| ft_sfnt_head)) != NULL) { |
| info->fEmSize = ttHeader->Units_Per_EM; |
| } |
| } |
| |
| info->fStyle = 0; |
| if (FT_IS_FIXED_WIDTH(face)) |
| info->fStyle |= SkAdvancedTypefaceMetrics::kFixedPitch_Style; |
| if (face->style_flags & FT_STYLE_FLAG_ITALIC) |
| info->fStyle |= SkAdvancedTypefaceMetrics::kItalic_Style; |
| // We should set either Symbolic or Nonsymbolic; Nonsymbolic if the font's |
| // character set is a subset of 'Adobe standard Latin.' |
| info->fStyle |= SkAdvancedTypefaceMetrics::kSymbolic_Style; |
| |
| PS_FontInfoRec ps_info; |
| TT_Postscript* tt_info; |
| if (FT_Get_PS_Font_Info(face, &ps_info) == 0) { |
| info->fItalicAngle = ps_info.italic_angle; |
| } else if ((tt_info = |
| (TT_Postscript*)FT_Get_Sfnt_Table(face, |
| ft_sfnt_post)) != NULL) { |
| info->fItalicAngle = SkFixedToScalar(tt_info->italicAngle); |
| } else { |
| info->fItalicAngle = 0; |
| } |
| |
| info->fAscent = face->ascender; |
| info->fDescent = face->descender; |
| |
| // 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; |
| char stem_chars[] = {'i', 'I', '!', '1'}; |
| for (size_t i = 0; i < SK_ARRAY_COUNT(stem_chars); i++) { |
| FT_BBox bbox; |
| if (GetLetterCBox(face, stem_chars[i], &bbox)) { |
| int16_t width = bbox.xMax - bbox.xMin; |
| if (width > 0 && width < min_width) { |
| min_width = width; |
| info->fStemV = min_width; |
| } |
| } |
| } |
| |
| TT_PCLT* pclt_info; |
| TT_OS2* os2_table; |
| if ((pclt_info = (TT_PCLT*)FT_Get_Sfnt_Table(face, ft_sfnt_pclt)) != NULL) { |
| info->fCapHeight = pclt_info->CapHeight; |
| uint8_t serif_style = pclt_info->SerifStyle & 0x3F; |
| if (serif_style >= 2 && serif_style <= 6) |
| info->fStyle |= SkAdvancedTypefaceMetrics::kSerif_Style; |
| else if (serif_style >= 9 && serif_style <= 12) |
| info->fStyle |= SkAdvancedTypefaceMetrics::kScript_Style; |
| } else if ((os2_table = |
| (TT_OS2*)FT_Get_Sfnt_Table(face, ft_sfnt_os2)) != NULL) { |
| info->fCapHeight = os2_table->sCapHeight; |
| } else { |
| // Figure out a good guess for CapHeight: average the height of M and X. |
| FT_BBox m_bbox, x_bbox; |
| bool got_m, got_x; |
| got_m = GetLetterCBox(face, 'M', &m_bbox); |
| got_x = GetLetterCBox(face, 'X', &x_bbox); |
| if (got_m && got_x) { |
| info->fCapHeight = (m_bbox.yMax - m_bbox.yMin + x_bbox.yMax - |
| x_bbox.yMin) / 2; |
| } else if (got_m && !got_x) { |
| info->fCapHeight = m_bbox.yMax - m_bbox.yMin; |
| } else if (!got_m && got_x) { |
| info->fCapHeight = x_bbox.yMax - x_bbox.yMin; |
| } |
| } |
| |
| info->fBBox = SkIRect::MakeLTRB(face->bbox.xMin, face->bbox.yMax, |
| face->bbox.xMax, face->bbox.yMin); |
| |
| if (!canEmbed(face) || !FT_IS_SCALABLE(face) || |
| info->fType == SkAdvancedTypefaceMetrics::kOther_Font) { |
| perGlyphInfo = SkAdvancedTypefaceMetrics::kNo_PerGlyphInfo; |
| } |
| |
| if (perGlyphInfo & SkAdvancedTypefaceMetrics::kHAdvance_PerGlyphInfo) { |
| if (FT_IS_FIXED_WIDTH(face)) { |
| appendRange(&info->fGlyphWidths, 0); |
| int16_t advance = face->max_advance_width; |
| info->fGlyphWidths->fAdvance.append(1, &advance); |
| finishRange(info->fGlyphWidths.get(), 0, |
| SkAdvancedTypefaceMetrics::WidthRange::kDefault); |
| } else if (!cid) { |
| appendRange(&info->fGlyphWidths, 0); |
| // So as to not blow out the stack, get advances in batches. |
| for (int gID = 0; gID < face->num_glyphs; gID += 128) { |
| FT_Fixed advances[128]; |
| int advanceCount = 128; |
| if (gID + advanceCount > face->num_glyphs) |
| advanceCount = face->num_glyphs - gID + 1; |
| getAdvances(face, gID, advanceCount, FT_LOAD_NO_SCALE, |
| advances); |
| for (int i = 0; i < advanceCount; i++) { |
| int16_t advance = advances[gID + i]; |
| info->fGlyphWidths->fAdvance.append(1, &advance); |
| } |
| } |
| finishRange(info->fGlyphWidths.get(), face->num_glyphs - 1, |
| SkAdvancedTypefaceMetrics::WidthRange::kRange); |
| } else { |
| info->fGlyphWidths.reset( |
| getAdvanceData(face, |
| face->num_glyphs, |
| glyphIDs, |
| glyphIDsCount, |
| &getWidthAdvance)); |
| } |
| } |
| |
| if (perGlyphInfo & SkAdvancedTypefaceMetrics::kVAdvance_PerGlyphInfo && |
| FT_HAS_VERTICAL(face)) { |
| SkASSERT(false); // Not implemented yet. |
| } |
| |
| if (perGlyphInfo & SkAdvancedTypefaceMetrics::kGlyphNames_PerGlyphInfo && |
| info->fType == SkAdvancedTypefaceMetrics::kType1_Font) { |
| // Postscript fonts may contain more than 255 glyphs, so we end up |
| // using multiple font descriptions with a glyph ordering. Record |
| // the name of each glyph. |
| info->fGlyphNames.reset( |
| new SkAutoTArray<SkString>(face->num_glyphs)); |
| for (int gID = 0; gID < face->num_glyphs; gID++) { |
| char glyphName[128]; // PS limit for names is 127 bytes. |
| FT_Get_Glyph_Name(face, gID, glyphName, 128); |
| info->fGlyphNames->get()[gID].set(glyphName); |
| } |
| } |
| |
| if (perGlyphInfo & SkAdvancedTypefaceMetrics::kToUnicode_PerGlyphInfo && |
| info->fType != SkAdvancedTypefaceMetrics::kType1_Font && |
| face->num_charmaps) { |
| populate_glyph_to_unicode(face, &(info->fGlyphToUnicode)); |
| } |
| |
| if (!canEmbed(face)) |
| info->fType = SkAdvancedTypefaceMetrics::kNotEmbeddable_Font; |
| |
| unref_ft_face(face); |
| return info; |
| #endif |
| } |
| |
| /////////////////////////////////////////////////////////////////////////// |
| |
| #define BLACK_LUMINANCE_LIMIT 0x40 |
| #define WHITE_LUMINANCE_LIMIT 0xA0 |
| |
| static bool bothZero(SkScalar a, SkScalar b) { |
| return 0 == a && 0 == b; |
| } |
| |
| // returns false if there is any non-90-rotation or skew |
| static bool isAxisAligned(const SkScalerContext::Rec& rec) { |
| return 0 == rec.fPreSkewX && |
| (bothZero(rec.fPost2x2[0][1], rec.fPost2x2[1][0]) || |
| bothZero(rec.fPost2x2[0][0], rec.fPost2x2[1][1])); |
| } |
| |
| void SkFontHost::FilterRec(SkScalerContext::Rec* rec) { |
| if (!gLCDSupportValid) { |
| InitFreetype(); |
| FT_Done_FreeType(gFTLibrary); |
| } |
| |
| if (!gLCDSupport && isLCD(*rec)) { |
| // If the runtime Freetype library doesn't support LCD mode, we disable |
| // it here. |
| rec->fMaskFormat = SkMask::kA8_Format; |
| } |
| |
| SkPaint::Hinting h = rec->getHinting(); |
| if (SkPaint::kFull_Hinting == h && !isLCD(*rec)) { |
| // collapse full->normal hinting if we're not doing LCD |
| h = SkPaint::kNormal_Hinting; |
| } |
| if ((rec->fFlags & SkScalerContext::kSubpixelPositioning_Flag) || isLCD(*rec)) { |
| if (SkPaint::kNo_Hinting != h) { |
| h = SkPaint::kSlight_Hinting; |
| } |
| } |
| |
| #ifndef SK_IGNORE_ROTATED_FREETYPE_FIX |
| // rotated text looks bad with hinting, so we disable it as needed |
| if (!isAxisAligned(*rec)) { |
| h = SkPaint::kNo_Hinting; |
| } |
| #endif |
| rec->setHinting(h); |
| |
| #ifndef SK_USE_COLOR_LUMINANCE |
| // for compatibility at the moment, discretize luminance to 3 settings |
| // black, white, gray. This helps with fontcache utilization, since we |
| // won't create multiple entries that in the end map to the same results. |
| { |
| unsigned lum = rec->getLuminanceByte(); |
| if (gGammaTables[0] || gGammaTables[1]) { |
| if (lum <= BLACK_LUMINANCE_LIMIT) { |
| lum = 0; |
| } else if (lum >= WHITE_LUMINANCE_LIMIT) { |
| lum = SkScalerContext::kLuminance_Max; |
| } else { |
| lum = SkScalerContext::kLuminance_Max >> 1; |
| } |
| } else { |
| lum = 0; // no gamma correct, so use 0 since SkPaint uses that |
| // when measuring text w/o regard for luminance |
| } |
| rec->setLuminanceBits(lum); |
| } |
| #endif |
| } |
| |
| #ifdef SK_BUILD_FOR_ANDROID |
| uint32_t SkFontHost::GetUnitsPerEm(SkFontID fontID) { |
| SkAutoMutexAcquire ac(gFTMutex); |
| FT_Library libInit = NULL; |
| if (gFTCount == 0) { |
| if (!InitFreetype()) |
| sk_throw(); |
| libInit = gFTLibrary; |
| } |
| SkAutoTCallIProc<struct FT_LibraryRec_, FT_Done_FreeType> ftLib(libInit); |
| SkFaceRec *rec = ref_ft_face(fontID); |
| uint16_t unitsPerEm = 0; |
| |
| if (rec != NULL && rec->fFace != NULL) { |
| unitsPerEm = rec->fFace->units_per_EM; |
| unref_ft_face(rec->fFace); |
| } |
| |
| return (uint32_t)unitsPerEm; |
| } |
| #endif |
| |
| SkScalerContext_FreeType::SkScalerContext_FreeType(const SkDescriptor* desc) |
| : SkScalerContext(desc) { |
| SkAutoMutexAcquire ac(gFTMutex); |
| |
| if (gFTCount == 0) { |
| if (!InitFreetype()) { |
| sk_throw(); |
| } |
| SkFontHost::GetGammaTables(gGammaTables); |
| } |
| ++gFTCount; |
| |
| // load the font file |
| fFTSize = NULL; |
| fFace = NULL; |
| fFaceRec = ref_ft_face(fRec.fFontID); |
| if (NULL == fFaceRec) { |
| return; |
| } |
| fFace = fFaceRec->fFace; |
| |
| // compute our factors from the record |
| |
| SkMatrix m; |
| |
| fRec.getSingleMatrix(&m); |
| |
| #ifdef DUMP_STRIKE_CREATION |
| SkString keyString; |
| SkFontHost::GetDescriptorKeyString(desc, &keyString); |
| printf("========== strike [%g %g %g] [%g %g %g %g] hints %d format %d %s\n", SkScalarToFloat(fRec.fTextSize), |
| SkScalarToFloat(fRec.fPreScaleX), SkScalarToFloat(fRec.fPreSkewX), |
| SkScalarToFloat(fRec.fPost2x2[0][0]), SkScalarToFloat(fRec.fPost2x2[0][1]), |
| SkScalarToFloat(fRec.fPost2x2[1][0]), SkScalarToFloat(fRec.fPost2x2[1][1]), |
| fRec.getHinting(), fRec.fMaskFormat, keyString.c_str()); |
| #endif |
| |
| // now compute our scale factors |
| SkScalar sx = m.getScaleX(); |
| SkScalar sy = m.getScaleY(); |
| |
| if (m.getSkewX() || m.getSkewY() || sx < 0 || sy < 0) { |
| // sort of give up on hinting |
| sx = SkMaxScalar(SkScalarAbs(sx), SkScalarAbs(m.getSkewX())); |
| sy = SkMaxScalar(SkScalarAbs(m.getSkewY()), SkScalarAbs(sy)); |
| sx = sy = SkScalarAve(sx, sy); |
| |
| SkScalar inv = SkScalarInvert(sx); |
| |
| // flip the skew elements to go from our Y-down system to FreeType's |
| fMatrix22.xx = SkScalarToFixed(SkScalarMul(m.getScaleX(), inv)); |
| fMatrix22.xy = -SkScalarToFixed(SkScalarMul(m.getSkewX(), inv)); |
| fMatrix22.yx = -SkScalarToFixed(SkScalarMul(m.getSkewY(), inv)); |
| fMatrix22.yy = SkScalarToFixed(SkScalarMul(m.getScaleY(), inv)); |
| } else { |
| fMatrix22.xx = fMatrix22.yy = SK_Fixed1; |
| fMatrix22.xy = fMatrix22.yx = 0; |
| } |
| |
| fScaleX = SkScalarToFixed(sx); |
| fScaleY = SkScalarToFixed(sy); |
| |
| // compute the flags we send to Load_Glyph |
| fUseVertMetrics = false; |
| { |
| FT_Int32 loadFlags = FT_LOAD_DEFAULT; |
| bool linearMetrics = false; |
| |
| if (SkMask::kBW_Format == fRec.fMaskFormat) { |
| // See http://code.google.com/p/chromium/issues/detail?id=43252#c24 |
| loadFlags = FT_LOAD_TARGET_MONO; |
| if (fRec.getHinting() == SkPaint::kNo_Hinting) { |
| loadFlags = FT_LOAD_NO_HINTING; |
| linearMetrics = true; |
| } |
| } else { |
| switch (fRec.getHinting()) { |
| case SkPaint::kNo_Hinting: |
| loadFlags = FT_LOAD_NO_HINTING; |
| linearMetrics = true; |
| break; |
| case SkPaint::kSlight_Hinting: |
| loadFlags = FT_LOAD_TARGET_LIGHT; // This implies FORCE_AUTOHINT |
| linearMetrics = true; |
| break; |
| case SkPaint::kNormal_Hinting: |
| if (fRec.fFlags & SkScalerContext::kAutohinting_Flag) |
| loadFlags = FT_LOAD_FORCE_AUTOHINT; |
| else |
| loadFlags = FT_LOAD_NO_AUTOHINT; |
| break; |
| case SkPaint::kFull_Hinting: |
| if (fRec.fFlags & SkScalerContext::kAutohinting_Flag) { |
| loadFlags = FT_LOAD_FORCE_AUTOHINT; |
| break; |
| } |
| loadFlags = FT_LOAD_TARGET_NORMAL; |
| if (isLCD(fRec)) { |
| if (fRec.fFlags & SkScalerContext::kLCD_Vertical_Flag) { |
| loadFlags = FT_LOAD_TARGET_LCD_V; |
| } else { |
| loadFlags = FT_LOAD_TARGET_LCD; |
| } |
| } |
| break; |
| default: |
| SkDebugf("---------- UNKNOWN hinting %d\n", fRec.getHinting()); |
| break; |
| } |
| } |
| |
| if ((fRec.fFlags & SkScalerContext::kEmbeddedBitmapText_Flag) == 0) { |
| loadFlags |= FT_LOAD_NO_BITMAP; |
| } |
| |
| // Always using FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH to get correct |
| // advances, as fontconfig and cairo do. |
| // See http://code.google.com/p/skia/issues/detail?id=222. |
| loadFlags |= FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH; |
| |
| // Use vertical layout if requested and supported. |
| if ((fRec.fFlags & SkScalerContext::kVertical_Flag) && FT_HAS_VERTICAL(fFace)) { |
| loadFlags |= FT_LOAD_VERTICAL_LAYOUT; |
| fUseVertMetrics = true; |
| } |
| |
| fLoadGlyphFlags = loadFlags; |
| fDoLinearMetrics = linearMetrics; |
| } |
| |
| // now create the FT_Size |
| |
| { |
| FT_Error err; |
| |
| err = FT_New_Size(fFace, &fFTSize); |
| if (err != 0) { |
| SkDEBUGF(("SkScalerContext_FreeType::FT_New_Size(%x): FT_Set_Char_Size(0x%x, 0x%x) returned 0x%x\n", |
| fFaceRec->fFontID, fScaleX, fScaleY, err)); |
| fFace = NULL; |
| return; |
| } |
| |
| err = FT_Activate_Size(fFTSize); |
| if (err != 0) { |
| SkDEBUGF(("SkScalerContext_FreeType::FT_Activate_Size(%x, 0x%x, 0x%x) returned 0x%x\n", |
| fFaceRec->fFontID, fScaleX, fScaleY, err)); |
| fFTSize = NULL; |
| } |
| |
| err = FT_Set_Char_Size( fFace, |
| SkFixedToFDot6(fScaleX), SkFixedToFDot6(fScaleY), |
| 72, 72); |
| if (err != 0) { |
| SkDEBUGF(("SkScalerContext_FreeType::FT_Set_Char_Size(%x, 0x%x, 0x%x) returned 0x%x\n", |
| fFaceRec->fFontID, fScaleX, fScaleY, err)); |
| fFace = NULL; |
| return; |
| } |
| |
| FT_Set_Transform( fFace, &fMatrix22, NULL); |
| } |
| } |
| |
| SkScalerContext_FreeType::~SkScalerContext_FreeType() { |
| if (fFTSize != NULL) { |
| FT_Done_Size(fFTSize); |
| } |
| |
| SkAutoMutexAcquire ac(gFTMutex); |
| |
| if (fFace != NULL) { |
| unref_ft_face(fFace); |
| } |
| if (--gFTCount == 0) { |
| // SkDEBUGF(("FT_Done_FreeType\n")); |
| FT_Done_FreeType(gFTLibrary); |
| SkDEBUGCODE(gFTLibrary = NULL;) |
| } |
| } |
| |
| /* We call this before each use of the fFace, since we may be sharing |
| this face with other context (at different sizes). |
| */ |
| FT_Error SkScalerContext_FreeType::setupSize() { |
| FT_Error err = FT_Activate_Size(fFTSize); |
| |
| if (err != 0) { |
| SkDEBUGF(("SkScalerContext_FreeType::FT_Activate_Size(%x, 0x%x, 0x%x) returned 0x%x\n", |
| fFaceRec->fFontID, fScaleX, fScaleY, err)); |
| fFTSize = NULL; |
| } else { |
| // seems we need to reset this every time (not sure why, but without it |
| // I get random italics from some other fFTSize) |
| FT_Set_Transform( fFace, &fMatrix22, NULL); |
| } |
| return err; |
| } |
| |
| void SkScalerContext_FreeType::emboldenOutline(FT_Outline* outline) { |
| FT_Pos strength; |
| strength = FT_MulFix(fFace->units_per_EM, fFace->size->metrics.y_scale) |
| / SK_OUTLINE_EMBOLDEN_DIVISOR; |
| FT_Outline_Embolden(outline, strength); |
| } |
| |
| unsigned SkScalerContext_FreeType::generateGlyphCount() { |
| return fFace->num_glyphs; |
| } |
| |
| uint16_t SkScalerContext_FreeType::generateCharToGlyph(SkUnichar uni) { |
| return SkToU16(FT_Get_Char_Index( fFace, uni )); |
| } |
| |
| SkUnichar SkScalerContext_FreeType::generateGlyphToChar(uint16_t glyph) { |
| // iterate through each cmap entry, looking for matching glyph indices |
| FT_UInt glyphIndex; |
| SkUnichar charCode = FT_Get_First_Char( fFace, &glyphIndex ); |
| |
| while (glyphIndex != 0) { |
| if (glyphIndex == glyph) { |
| return charCode; |
| } |
| charCode = FT_Get_Next_Char( fFace, charCode, &glyphIndex ); |
| } |
| |
| return 0; |
| } |
| |
| static FT_Pixel_Mode compute_pixel_mode(SkMask::Format format) { |
| switch (format) { |
| case SkMask::kBW_Format: |
| return FT_PIXEL_MODE_MONO; |
| case SkMask::kA8_Format: |
| default: |
| return FT_PIXEL_MODE_GRAY; |
| } |
| } |
| |
| void SkScalerContext_FreeType::generateAdvance(SkGlyph* glyph) { |
| #ifdef FT_ADVANCES_H |
| /* unhinted and light hinted text have linearly scaled advances |
| * which are very cheap to compute with some font formats... |
| */ |
| if (fDoLinearMetrics) { |
| SkAutoMutexAcquire ac(gFTMutex); |
| |
| if (this->setupSize()) { |
| glyph->zeroMetrics(); |
| return; |
| } |
| |
| FT_Error error; |
| FT_Fixed advance; |
| |
| error = FT_Get_Advance( fFace, glyph->getGlyphID(fBaseGlyphCount), |
| fLoadGlyphFlags | FT_ADVANCE_FLAG_FAST_ONLY, |
| &advance ); |
| if (0 == error) { |
| glyph->fRsbDelta = 0; |
| glyph->fLsbDelta = 0; |
| glyph->fAdvanceX = SkFixedMul(fMatrix22.xx, advance); // advance *2/3; //DEBUG |
| glyph->fAdvanceY = -SkFixedMul(fMatrix22.yx, advance); |
| return; |
| } |
| } |
| #endif /* FT_ADVANCES_H */ |
| /* otherwise, we need to load/hint the glyph, which is slower */ |
| this->generateMetrics(glyph); |
| return; |
| } |
| |
| void SkScalerContext_FreeType::getBBoxForCurrentGlyph(SkGlyph* glyph, |
| FT_BBox* bbox, |
| bool snapToPixelBoundary) { |
| |
| FT_Outline_Get_CBox(&fFace->glyph->outline, bbox); |
| |
| if (fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag) { |
| int dx = FixedToDot6(glyph->getSubXFixed()); |
| int dy = FixedToDot6(glyph->getSubYFixed()); |
| // negate dy since freetype-y-goes-up and skia-y-goes-down |
| bbox->xMin += dx; |
| bbox->yMin -= dy; |
| bbox->xMax += dx; |
| bbox->yMax -= dy; |
| } |
| |
| // outset the box to integral boundaries |
| if (snapToPixelBoundary) { |
| bbox->xMin &= ~63; |
| bbox->yMin &= ~63; |
| bbox->xMax = (bbox->xMax + 63) & ~63; |
| bbox->yMax = (bbox->yMax + 63) & ~63; |
| } |
| |
| // Must come after snapToPixelBoundary so that the width and height are |
| // consistent. Otherwise asserts will fire later on when generating the |
| // glyph image. |
| if (fUseVertMetrics) { |
| FT_Vector vector; |
| vector.x = fFace->glyph->metrics.vertBearingX - fFace->glyph->metrics.horiBearingX; |
| vector.y = -fFace->glyph->metrics.vertBearingY - fFace->glyph->metrics.horiBearingY; |
| FT_Vector_Transform(&vector, &fMatrix22); |
| bbox->xMin += vector.x; |
| bbox->xMax += vector.x; |
| bbox->yMin += vector.y; |
| bbox->yMax += vector.y; |
| } |
| } |
| |
| void SkScalerContext_FreeType::updateGlyphIfLCD(SkGlyph* glyph) { |
| if (isLCD(fRec)) { |
| glyph->fWidth += gLCDExtra; |
| glyph->fLeft -= gLCDExtra >> 1; |
| } |
| } |
| |
| void SkScalerContext_FreeType::generateMetrics(SkGlyph* glyph) { |
| SkAutoMutexAcquire ac(gFTMutex); |
| |
| glyph->fRsbDelta = 0; |
| glyph->fLsbDelta = 0; |
| |
| FT_Error err; |
| |
| if (this->setupSize()) { |
| goto ERROR; |
| } |
| |
| err = FT_Load_Glyph( fFace, glyph->getGlyphID(fBaseGlyphCount), fLoadGlyphFlags ); |
| if (err != 0) { |
| SkDEBUGF(("SkScalerContext_FreeType::generateMetrics(%x): FT_Load_Glyph(glyph:%d flags:%d) returned 0x%x\n", |
| fFaceRec->fFontID, glyph->getGlyphID(fBaseGlyphCount), fLoadGlyphFlags, err)); |
| ERROR: |
| glyph->zeroMetrics(); |
| return; |
| } |
| |
| SkFixed vLeft, vTop; |
| |
| switch ( fFace->glyph->format ) { |
| case FT_GLYPH_FORMAT_OUTLINE: { |
| FT_BBox bbox; |
| |
| if (0 == fFace->glyph->outline.n_contours) { |
| glyph->fWidth = 0; |
| glyph->fHeight = 0; |
| glyph->fTop = 0; |
| glyph->fLeft = 0; |
| break; |
| } |
| |
| if ((fRec.fFlags & kEmbolden_Flag) && !(fFace->style_flags & FT_STYLE_FLAG_BOLD)) { |
| emboldenOutline(&fFace->glyph->outline); |
| } |
| |
| getBBoxForCurrentGlyph(glyph, &bbox, true); |
| |
| glyph->fWidth = SkToU16((bbox.xMax - bbox.xMin) >> 6); |
| glyph->fHeight = SkToU16((bbox.yMax - bbox.yMin) >> 6); |
| glyph->fTop = -SkToS16(bbox.yMax >> 6); |
| glyph->fLeft = SkToS16(bbox.xMin >> 6); |
| |
| if ((fRec.fFlags & SkScalerContext::kVertical_Flag)) { |
| vLeft = Dot6ToFixed(bbox.xMin); |
| vTop = Dot6ToFixed(bbox.yMax); |
| } |
| |
| updateGlyphIfLCD(glyph); |
| |
| break; |
| } |
| |
| case FT_GLYPH_FORMAT_BITMAP: |
| if ((fRec.fFlags & kEmbolden_Flag) && !(fFace->style_flags & FT_STYLE_FLAG_BOLD)) { |
| FT_GlyphSlot_Own_Bitmap(fFace->glyph); |
| FT_Bitmap_Embolden(gFTLibrary, &fFace->glyph->bitmap, kBitmapEmboldenStrength, 0); |
| } |
| |
| if (fUseVertMetrics) { |
| FT_Vector vector; |
| vector.x = fFace->glyph->metrics.vertBearingX - fFace->glyph->metrics.horiBearingX; |
| vector.y = -fFace->glyph->metrics.vertBearingY - fFace->glyph->metrics.horiBearingY; |
| FT_Vector_Transform(&vector, &fMatrix22); |
| fFace->glyph->bitmap_left += SkFDot6Floor(vector.x); |
| fFace->glyph->bitmap_top += SkFDot6Floor(vector.y); |
| } |
| |
| glyph->fWidth = SkToU16(fFace->glyph->bitmap.width); |
| glyph->fHeight = SkToU16(fFace->glyph->bitmap.rows); |
| glyph->fTop = -SkToS16(fFace->glyph->bitmap_top); |
| glyph->fLeft = SkToS16(fFace->glyph->bitmap_left); |
| break; |
| |
| default: |
| SkDEBUGFAIL("unknown glyph format"); |
| goto ERROR; |
| } |
| |
| if ((fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag) == 0) { |
| glyph->fAdvanceX = SkFDot6ToFixed(fFace->glyph->advance.x); |
| glyph->fAdvanceY = -SkFDot6ToFixed(fFace->glyph->advance.y); |
| if (fRec.fFlags & kDevKernText_Flag) { |
| glyph->fRsbDelta = SkToS8(fFace->glyph->rsb_delta); |
| glyph->fLsbDelta = SkToS8(fFace->glyph->lsb_delta); |
| } |
| } else { |
| glyph->fAdvanceX = SkFixedMul(fMatrix22.xx, fFace->glyph->linearHoriAdvance); |
| glyph->fAdvanceY = -SkFixedMul(fMatrix22.yx, fFace->glyph->linearHoriAdvance); |
| } |
| |
| if (fUseVertMetrics) { |
| if (fDoLinearMetrics) { |
| glyph->fAdvanceX = -SkFixedMul(fMatrix22.xy, fFace->glyph->linearVertAdvance); |
| glyph->fAdvanceY = SkFixedMul(fMatrix22.yy, fFace->glyph->linearVertAdvance); |
| } else { |
| glyph->fAdvanceX = -SkFDot6ToFixed(fFace->glyph->advance.x); |
| glyph->fAdvanceY = SkFDot6ToFixed(fFace->glyph->advance.y); |
| } |
| |
| } else if ((fRec.fFlags & SkScalerContext::kVertical_Flag) |
| && fFace->glyph->format == FT_GLYPH_FORMAT_OUTLINE) { |
| |
| //TODO: do we need to specially handle SubpixelPositioning and Kerning? |
| |
| FT_Matrix identityMatrix; |
| identityMatrix.xx = identityMatrix.yy = SK_Fixed1; |
| identityMatrix.xy = identityMatrix.yx = 0; |
| |
| // if the matrix is not the identity matrix then we need to re-load the |
| // glyph with the identity matrix to get the necessary bounding box |
| if (memcmp(&fMatrix22, &identityMatrix, sizeof(FT_Matrix)) != 0) { |
| |
| FT_Set_Transform(fFace, &identityMatrix, NULL); |
| |
| err = FT_Load_Glyph( fFace, glyph->getGlyphID(fBaseGlyphCount), fLoadGlyphFlags ); |
| if (err != 0) { |
| SkDEBUGF(("SkScalerContext_FreeType::generateMetrics(%x): FT_Load_Glyph(glyph:%d flags:%d) returned 0x%x\n", |
| fFaceRec->fFontID, glyph->getGlyphID(fBaseGlyphCount), fLoadGlyphFlags, err)); |
| goto ERROR; |
| } |
| |
| if ((fRec.fFlags & kEmbolden_Flag) && !(fFace->style_flags & FT_STYLE_FLAG_BOLD)) { |
| emboldenOutline(&fFace->glyph->outline); |
| } |
| } |
| |
| // bounding box of the unskewed and unscaled glyph |
| FT_BBox bbox; |
| getBBoxForCurrentGlyph(glyph, &bbox); |
| |
| // compute the vertical gap above and below the glyph if the glyph were |
| // centered within the linearVertAdvance |
| SkFixed vGap = (fFace->glyph->linearVertAdvance - Dot6ToFixed(bbox.yMax - bbox.yMin)) / 2; |
| |
| // the origin point of the glyph when rendered vertically |
| FT_Vector vOrigin; |
| vOrigin.x = fFace->glyph->linearHoriAdvance / 2; |
| vOrigin.y = vGap + Dot6ToFixed(bbox.yMax); |
| |
| // transform the vertical origin based on the matrix of the actual glyph |
| FT_Vector_Transform(&vOrigin, &fMatrix22); |
| |
| // compute a new offset vector for the glyph by subtracting the vertical |
| // origin from the original horizontal offset vector |
| glyph->fLeft = SkFixedRoundToInt(vLeft - vOrigin.x); |
| glyph->fTop = -SkFixedRoundToInt(vTop - vOrigin.y); |
| |
| updateGlyphIfLCD(glyph); |
| |
| // use the vertical advance values computed by freetype |
| glyph->fAdvanceX = -SkFixedMul(fMatrix22.xy, fFace->glyph->linearVertAdvance); |
| glyph->fAdvanceY = SkFixedMul(fMatrix22.yy, fFace->glyph->linearVertAdvance); |
| } |
| |
| |
| #ifdef ENABLE_GLYPH_SPEW |
| SkDEBUGF(("FT_Set_Char_Size(this:%p sx:%x sy:%x ", this, fScaleX, fScaleY)); |
| SkDEBUGF(("Metrics(glyph:%d flags:0x%x) w:%d\n", glyph->getGlyphID(fBaseGlyphCount), fLoadGlyphFlags, glyph->fWidth)); |
| #endif |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| static int apply_contrast(int srca, int contrast) { |
| return srca + (((255 - srca) * contrast * srca) / (255*255)); |
| } |
| |
| static void build_power_table(uint8_t table[], float ee) { |
| for (int i = 0; i < 256; i++) { |
| float x = i / 255.f; |
| x = powf(x, ee); |
| int xx = SkScalarRoundToInt(SkFloatToScalar(x * 255)); |
| table[i] = SkToU8(xx); |
| } |
| } |
| |
| static void build_gamma_table(uint8_t table[256], int src, int dst) { |
| static bool gInit; |
| static uint8_t powTable[256], invPowTable[256]; |
| if (!gInit) { |
| const float g = SK_GAMMA_EXPONENT; |
| build_power_table(powTable, g); |
| build_power_table(invPowTable, 1/g); |
| gInit = true; |
| } |
| |
| const int linSrc = powTable[src]; |
| const int linDst = powTable[dst]; |
| // have our contrast value taper off to 0 as the src luminance becomes white |
| const int contrast = SK_GAMMA_CONTRAST * (255 - linSrc) / 255; |
| |
| for (int i = 0; i < 256; ++i) { |
| int srca = apply_contrast(i, contrast); |
| SkASSERT((unsigned)srca <= 255); |
| int dsta = 255 - srca; |
| |
| //Calculate the output we want. |
| int linOut = (linSrc * srca + dsta * linDst) / 255; |
| SkASSERT((unsigned)linOut <= 255); |
| int out = invPowTable[linOut]; |
| |
| //Undo what the blit blend will do. |
| int result = ((255 * out) - (255 * dst)) / (src - dst); |
| SkASSERT((unsigned)result <= 255); |
| |
| table[i] = result; |
| } |
| } |
| |
| static const uint8_t* getGammaTable(U8CPU luminance) { |
| static uint8_t gGammaTables[4][256]; |
| static bool gInited; |
| if (!gInited) { |
| build_gamma_table(gGammaTables[0], 0x00, 0xFF); |
| build_gamma_table(gGammaTables[1], 0x66, 0x99); |
| build_gamma_table(gGammaTables[2], 0x99, 0x66); |
| build_gamma_table(gGammaTables[3], 0xFF, 0x00); |
| |
| gInited = true; |
| } |
| SkASSERT(0 == (luminance >> 8)); |
| return gGammaTables[luminance >> 6]; |
| } |
| |
| #ifndef SK_USE_COLOR_LUMINANCE |
| static const uint8_t* getIdentityTable() { |
| static bool gOnce; |
| static uint8_t gIdentityTable[256]; |
| if (!gOnce) { |
| for (int i = 0; i < 256; ++i) { |
| gIdentityTable[i] = i; |
| } |
| gOnce = true; |
| } |
| return gIdentityTable; |
| } |
| #endif |
| |
| static uint16_t packTriple(unsigned r, unsigned g, unsigned b) { |
| return SkPackRGB16(r >> 3, g >> 2, b >> 3); |
| } |
| |
| static uint16_t grayToRGB16(U8CPU gray) { |
| SkASSERT(gray <= 255); |
| return SkPackRGB16(gray >> 3, gray >> 2, gray >> 3); |
| } |
| |
| static int bittst(const uint8_t data[], int bitOffset) { |
| SkASSERT(bitOffset >= 0); |
| int lowBit = data[bitOffset >> 3] >> (~bitOffset & 7); |
| return lowBit & 1; |
| } |
| |
| static void copyFT2LCD16(const SkGlyph& glyph, const FT_Bitmap& bitmap, |
| int lcdIsBGR, const uint8_t* tableR, |
| const uint8_t* tableG, const uint8_t* tableB) { |
| SkASSERT(glyph.fHeight == bitmap.rows); |
| uint16_t* dst = reinterpret_cast<uint16_t*>(glyph.fImage); |
| const size_t dstRB = glyph.rowBytes(); |
| const int width = glyph.fWidth; |
| const uint8_t* src = bitmap.buffer; |
| |
| switch (bitmap.pixel_mode) { |
| case FT_PIXEL_MODE_MONO: { |
| for (int y = 0; y < glyph.fHeight; ++y) { |
| for (int x = 0; x < width; ++x) { |
| dst[x] = -bittst(src, x); |
| } |
| dst = (uint16_t*)((char*)dst + dstRB); |
| src += bitmap.pitch; |
| } |
| } break; |
| case FT_PIXEL_MODE_GRAY: { |
| for (int y = 0; y < glyph.fHeight; ++y) { |
| for (int x = 0; x < width; ++x) { |
| dst[x] = grayToRGB16(src[x]); |
| } |
| dst = (uint16_t*)((char*)dst + dstRB); |
| src += bitmap.pitch; |
| } |
| } break; |
| default: { |
| SkASSERT(glyph.fWidth * 3 == bitmap.width); |
| for (int y = 0; y < glyph.fHeight; y++) { |
| const uint8_t* triple = src; |
| if (lcdIsBGR) { |
| for (int x = 0; x < width; x++) { |
| dst[x] = packTriple(tableR[triple[2]], |
| tableG[triple[1]], |
| tableB[triple[0]]); |
| triple += 3; |
| } |
| } else { |
| for (int x = 0; x < width; x++) { |
| dst[x] = packTriple(tableR[triple[0]], |
| tableG[triple[1]], |
| tableB[triple[2]]); |
| triple += 3; |
| } |
| } |
| src += bitmap.pitch; |
| dst = (uint16_t*)((char*)dst + dstRB); |
| } |
| } break; |
| } |
| } |
| |
| void SkScalerContext_FreeType::generateImage(const SkGlyph& glyph) { |
| SkAutoMutexAcquire ac(gFTMutex); |
| |
| FT_Error err; |
| |
| if (this->setupSize()) { |
| goto ERROR; |
| } |
| |
| err = FT_Load_Glyph( fFace, glyph.getGlyphID(fBaseGlyphCount), fLoadGlyphFlags); |
| if (err != 0) { |
| SkDEBUGF(("SkScalerContext_FreeType::generateImage: FT_Load_Glyph(glyph:%d width:%d height:%d rb:%d flags:%d) returned 0x%x\n", |
| glyph.getGlyphID(fBaseGlyphCount), glyph.fWidth, glyph.fHeight, glyph.rowBytes(), fLoadGlyphFlags, err)); |
| ERROR: |
| memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight); |
| return; |
| } |
| |
| #ifdef SK_USE_COLOR_LUMINANCE |
| SkColor lumColor = fRec.getLuminanceColor(); |
| const uint8_t* tableR = getGammaTable(SkColorGetR(lumColor)); |
| const uint8_t* tableG = getGammaTable(SkColorGetG(lumColor)); |
| const uint8_t* tableB = getGammaTable(SkColorGetB(lumColor)); |
| #else |
| unsigned lum = fRec.getLuminanceByte(); |
| const uint8_t* tableR; |
| const uint8_t* tableG; |
| const uint8_t* tableB; |
| |
| bool isWhite = lum >= WHITE_LUMINANCE_LIMIT; |
| bool isBlack = lum <= BLACK_LUMINANCE_LIMIT; |
| if ((gGammaTables[0] || gGammaTables[1]) && (isBlack || isWhite)) { |
| tableR = tableG = tableB = gGammaTables[isBlack ? 0 : 1]; |
| } else { |
| tableR = tableG = tableB = getIdentityTable(); |
| } |
| #endif |
| |
| switch ( fFace->glyph->format ) { |
| case FT_GLYPH_FORMAT_OUTLINE: { |
| FT_Outline* outline = &fFace->glyph->outline; |
| FT_BBox bbox; |
| FT_Bitmap target; |
| |
| if ((fRec.fFlags & kEmbolden_Flag) && !(fFace->style_flags & FT_STYLE_FLAG_BOLD)) { |
| emboldenOutline(outline); |
| } |
| |
| int dx = 0, dy = 0; |
| if (fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag) { |
| dx = glyph.getSubXFixed() >> 10; |
| dy = glyph.getSubYFixed() >> 10; |
| // negate dy since freetype-y-goes-up and skia-y-goes-down |
| dy = -dy; |
| } |
| FT_Outline_Get_CBox(outline, &bbox); |
| /* |
| what we really want to do for subpixel is |
| offset(dx, dy) |
| compute_bounds |
| offset(bbox & !63) |
| but that is two calls to offset, so we do the following, which |
| achieves the same thing with only one offset call. |
| */ |
| FT_Outline_Translate(outline, dx - ((bbox.xMin + dx) & ~63), |
| dy - ((bbox.yMin + dy) & ~63)); |
| |
| if (SkMask::kLCD16_Format == glyph.fMaskFormat) { |
| FT_Render_Glyph(fFace->glyph, FT_RENDER_MODE_LCD); |
| copyFT2LCD16(glyph, fFace->glyph->bitmap, |
| fRec.fFlags & SkScalerContext::kLCD_BGROrder_Flag, |
| tableR, tableG, tableB); |
| } else { |
| target.width = glyph.fWidth; |
| target.rows = glyph.fHeight; |
| target.pitch = glyph.rowBytes(); |
| target.buffer = reinterpret_cast<uint8_t*>(glyph.fImage); |
| target.pixel_mode = compute_pixel_mode( |
| (SkMask::Format)fRec.fMaskFormat); |
| target.num_grays = 256; |
| |
| memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight); |
| FT_Outline_Get_Bitmap(gFTLibrary, outline, &target); |
| } |
| } break; |
| |
| case FT_GLYPH_FORMAT_BITMAP: { |
| if ((fRec.fFlags & kEmbolden_Flag) && !(fFace->style_flags & FT_STYLE_FLAG_BOLD)) { |
| FT_GlyphSlot_Own_Bitmap(fFace->glyph); |
| FT_Bitmap_Embolden(gFTLibrary, &fFace->glyph->bitmap, kBitmapEmboldenStrength, 0); |
| } |
| SkASSERT_CONTINUE(glyph.fWidth == fFace->glyph->bitmap.width); |
| SkASSERT_CONTINUE(glyph.fHeight == fFace->glyph->bitmap.rows); |
| SkASSERT_CONTINUE(glyph.fTop == -fFace->glyph->bitmap_top); |
| SkASSERT_CONTINUE(glyph.fLeft == fFace->glyph->bitmap_left); |
| |
| const uint8_t* src = (const uint8_t*)fFace->glyph->bitmap.buffer; |
| uint8_t* dst = (uint8_t*)glyph.fImage; |
| |
| if (fFace->glyph->bitmap.pixel_mode == FT_PIXEL_MODE_GRAY || |
| (fFace->glyph->bitmap.pixel_mode == FT_PIXEL_MODE_MONO && |
| glyph.fMaskFormat == SkMask::kBW_Format)) { |
| unsigned srcRowBytes = fFace->glyph->bitmap.pitch; |
| unsigned dstRowBytes = glyph.rowBytes(); |
| unsigned minRowBytes = SkMin32(srcRowBytes, dstRowBytes); |
| unsigned extraRowBytes = dstRowBytes - minRowBytes; |
| |
| for (int y = fFace->glyph->bitmap.rows - 1; y >= 0; --y) { |
| memcpy(dst, src, minRowBytes); |
| memset(dst + minRowBytes, 0, extraRowBytes); |
| src += srcRowBytes; |
| dst += dstRowBytes; |
| } |
| } else if (fFace->glyph->bitmap.pixel_mode == FT_PIXEL_MODE_MONO && |
| glyph.fMaskFormat == SkMask::kA8_Format) { |
| for (int y = 0; y < fFace->glyph->bitmap.rows; ++y) { |
| uint8_t byte = 0; |
| int bits = 0; |
| const uint8_t* src_row = src; |
| uint8_t* dst_row = dst; |
| |
| for (int x = 0; x < fFace->glyph->bitmap.width; ++x) { |
| if (!bits) { |
| byte = *src_row++; |
| bits = 8; |
| } |
| |
| *dst_row++ = byte & 0x80 ? 0xff : 0; |
| bits--; |
| byte <<= 1; |
| } |
| |
| src += fFace->glyph->bitmap.pitch; |
| dst += glyph.rowBytes(); |
| } |
| } else if (SkMask::kLCD16_Format == glyph.fMaskFormat) { |
| copyFT2LCD16(glyph, fFace->glyph->bitmap, |
| fRec.fFlags & SkScalerContext::kLCD_BGROrder_Flag, |
| tableR, tableG, tableB); |
| } else { |
| SkDEBUGFAIL("unknown glyph bitmap transform needed"); |
| } |
| } break; |
| |
| default: |
| SkDEBUGFAIL("unknown glyph format"); |
| goto ERROR; |
| } |
| |
| // We used to always do this pre-USE_COLOR_LUMINANCE, but with colorlum, |
| // it is optional |
| #if defined(SK_GAMMA_APPLY_TO_A8) || !defined(SK_USE_COLOR_LUMINANCE) |
| if (SkMask::kA8_Format == glyph.fMaskFormat) { |
| SkASSERT(tableR == tableG && tableR == tableB); |
| const uint8_t* table = tableR; |
| uint8_t* SK_RESTRICT dst = (uint8_t*)glyph.fImage; |
| unsigned rowBytes = glyph.rowBytes(); |
| |
| for (int y = glyph.fHeight - 1; y >= 0; --y) { |
| for (int x = glyph.fWidth - 1; x >= 0; --x) { |
| dst[x] = table[dst[x]]; |
| } |
| dst += rowBytes; |
| } |
| } |
| #endif |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #define ft2sk(x) SkFixedToScalar((x) << 10) |
| |
| #if FREETYPE_MAJOR >= 2 && FREETYPE_MINOR >= 2 |
| #define CONST_PARAM const |
| #else // older freetype doesn't use const here |
| #define CONST_PARAM |
| #endif |
| |
| static int move_proc(CONST_PARAM FT_Vector* pt, void* ctx) { |
| SkPath* path = (SkPath*)ctx; |
| path->close(); // to close the previous contour (if any) |
| path->moveTo(ft2sk(pt->x), -ft2sk(pt->y)); |
| return 0; |
| } |
| |
| static int line_proc(CONST_PARAM FT_Vector* pt, void* ctx) { |
| SkPath* path = (SkPath*)ctx; |
| path->lineTo(ft2sk(pt->x), -ft2sk(pt->y)); |
| return 0; |
| } |
| |
| static int quad_proc(CONST_PARAM FT_Vector* pt0, CONST_PARAM FT_Vector* pt1, |
| void* ctx) { |
| SkPath* path = (SkPath*)ctx; |
| path->quadTo(ft2sk(pt0->x), -ft2sk(pt0->y), ft2sk(pt1->x), -ft2sk(pt1->y)); |
| return 0; |
| } |
| |
| static int cubic_proc(CONST_PARAM FT_Vector* pt0, CONST_PARAM FT_Vector* pt1, |
| CONST_PARAM FT_Vector* pt2, void* ctx) { |
| SkPath* path = (SkPath*)ctx; |
| path->cubicTo(ft2sk(pt0->x), -ft2sk(pt0->y), ft2sk(pt1->x), |
| -ft2sk(pt1->y), ft2sk(pt2->x), -ft2sk(pt2->y)); |
| return 0; |
| } |
| |
| void SkScalerContext_FreeType::generatePath(const SkGlyph& glyph, |
| SkPath* path) { |
| SkAutoMutexAcquire ac(gFTMutex); |
| |
| SkASSERT(&glyph && path); |
| |
| if (this->setupSize()) { |
| path->reset(); |
| return; |
| } |
| |
| uint32_t flags = fLoadGlyphFlags; |
| flags |= FT_LOAD_NO_BITMAP; // ignore embedded bitmaps so we're sure to get the outline |
| flags &= ~FT_LOAD_RENDER; // don't scan convert (we just want the outline) |
| |
| FT_Error err = FT_Load_Glyph( fFace, glyph.getGlyphID(fBaseGlyphCount), flags); |
| |
| if (err != 0) { |
| SkDEBUGF(("SkScalerContext_FreeType::generatePath: FT_Load_Glyph(glyph:%d flags:%d) returned 0x%x\n", |
| glyph.getGlyphID(fBaseGlyphCount), flags, err)); |
| path->reset(); |
| return; |
| } |
| |
| if ((fRec.fFlags & kEmbolden_Flag) && !(fFace->style_flags & FT_STYLE_FLAG_BOLD)) { |
| emboldenOutline(&fFace->glyph->outline); |
| } |
| |
| if (fUseVertMetrics) { |
| FT_Vector vector; |
| vector.x = fFace->glyph->metrics.vertBearingX - fFace->glyph->metrics.horiBearingX; |
| vector.y = -fFace->glyph->metrics.vertBearingY - fFace->glyph->metrics.horiBearingY; |
| FT_Vector_Transform(&vector, &fMatrix22); |
| FT_Outline_Translate(&fFace->glyph->outline, vector.x, vector.y); |
| } |
| |
| FT_Outline_Funcs funcs; |
| |
| funcs.move_to = move_proc; |
| funcs.line_to = line_proc; |
| funcs.conic_to = quad_proc; |
| funcs.cubic_to = cubic_proc; |
| funcs.shift = 0; |
| funcs.delta = 0; |
| |
| err = FT_Outline_Decompose(&fFace->glyph->outline, &funcs, path); |
| |
| if (err != 0) { |
| SkDEBUGF(("SkScalerContext_FreeType::generatePath: FT_Load_Glyph(glyph:%d flags:%d) returned 0x%x\n", |
| glyph.getGlyphID(fBaseGlyphCount), flags, err)); |
| path->reset(); |
| return; |
| } |
| |
| path->close(); |
| } |
| |
| void SkScalerContext_FreeType::generateFontMetrics(SkPaint::FontMetrics* mx, |
| SkPaint::FontMetrics* my) { |
| if (NULL == mx && NULL == my) { |
| return; |
| } |
| |
| SkAutoMutexAcquire ac(gFTMutex); |
| |
| if (this->setupSize()) { |
| ERROR: |
| if (mx) { |
| sk_bzero(mx, sizeof(SkPaint::FontMetrics)); |
| } |
| if (my) { |
| sk_bzero(my, sizeof(SkPaint::FontMetrics)); |
| } |
| return; |
| } |
| |
| FT_Face face = fFace; |
| int upem = face->units_per_EM; |
| if (upem <= 0) { |
| goto ERROR; |
| } |
| |
| SkPoint pts[6]; |
| SkFixed ys[6]; |
| SkFixed scaleY = fScaleY; |
| SkFixed mxy = fMatrix22.xy; |
| SkFixed myy = fMatrix22.yy; |
| SkScalar xmin = SkIntToScalar(face->bbox.xMin) / upem; |
| SkScalar xmax = SkIntToScalar(face->bbox.xMax) / upem; |
| |
| int leading = face->height - (face->ascender + -face->descender); |
| if (leading < 0) { |
| leading = 0; |
| } |
| |
| // Try to get the OS/2 table from the font. This contains the specific |
| // average font width metrics which Windows uses. |
| TT_OS2* os2 = (TT_OS2*) FT_Get_Sfnt_Table(face, ft_sfnt_os2); |
| |
| ys[0] = -face->bbox.yMax; |
| ys[1] = -face->ascender; |
| ys[2] = -face->descender; |
| ys[3] = -face->bbox.yMin; |
| ys[4] = leading; |
| ys[5] = os2 ? os2->xAvgCharWidth : 0; |
| |
| SkScalar x_height; |
| if (os2 && os2->sxHeight) { |
| x_height = SkFixedToScalar(SkMulDiv(fScaleX, os2->sxHeight, upem)); |
| } else { |
| const FT_UInt x_glyph = FT_Get_Char_Index(fFace, 'x'); |
| if (x_glyph) { |
| FT_BBox bbox; |
| FT_Load_Glyph(fFace, x_glyph, fLoadGlyphFlags); |
| if ((fRec.fFlags & kEmbolden_Flag) && !(fFace->style_flags & FT_STYLE_FLAG_BOLD)) { |
| emboldenOutline(&fFace->glyph->outline); |
| } |
| FT_Outline_Get_CBox(&fFace->glyph->outline, &bbox); |
| x_height = SkFixedToScalar(SkFDot6ToFixed(bbox.yMax)); |
| } else { |
| x_height = 0; |
| } |
| } |
| |
| // convert upem-y values into scalar points |
| for (int i = 0; i < 6; i++) { |
| SkFixed y = SkMulDiv(scaleY, ys[i], upem); |
| SkFixed x = SkFixedMul(mxy, y); |
| y = SkFixedMul(myy, y); |
| pts[i].set(SkFixedToScalar(x), SkFixedToScalar(y)); |
| } |
| |
| if (mx) { |
| mx->fTop = pts[0].fX; |
| mx->fAscent = pts[1].fX; |
| mx->fDescent = pts[2].fX; |
| mx->fBottom = pts[3].fX; |
| mx->fLeading = pts[4].fX; |
| mx->fAvgCharWidth = pts[5].fX; |
| mx->fXMin = xmin; |
| mx->fXMax = xmax; |
| mx->fXHeight = x_height; |
| } |
| if (my) { |
| my->fTop = pts[0].fY; |
| my->fAscent = pts[1].fY; |
| my->fDescent = pts[2].fY; |
| my->fBottom = pts[3].fY; |
| my->fLeading = pts[4].fY; |
| my->fAvgCharWidth = pts[5].fY; |
| my->fXMin = xmin; |
| my->fXMax = xmax; |
| my->fXHeight = x_height; |
| } |
| } |
| |
| //////////////////////////////////////////////////////////////////////// |
| //////////////////////////////////////////////////////////////////////// |
| |
| SkScalerContext* SkFontHost::CreateScalerContext(const SkDescriptor* desc) { |
| SkScalerContext_FreeType* c = SkNEW_ARGS(SkScalerContext_FreeType, (desc)); |
| if (!c->success()) { |
| SkDELETE(c); |
| c = NULL; |
| } |
| return c; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| /* Export this so that other parts of our FonttHost port can make use of our |
| ability to extract the name+style from a stream, using FreeType's api. |
| */ |
| bool find_name_and_attributes(SkStream* stream, SkString* name, |
| SkTypeface::Style* style, bool* isFixedWidth) { |
| FT_Library library; |
| if (FT_Init_FreeType(&library)) { |
| return false; |
| } |
| |
| FT_Open_Args args; |
| memset(&args, 0, sizeof(args)); |
| |
| const void* memoryBase = stream->getMemoryBase(); |
| FT_StreamRec streamRec; |
| |
| if (NULL != memoryBase) { |
| args.flags = FT_OPEN_MEMORY; |
| args.memory_base = (const FT_Byte*)memoryBase; |
| args.memory_size = stream->getLength(); |
| } else { |
| memset(&streamRec, 0, sizeof(streamRec)); |
| streamRec.size = stream->read(NULL, 0); |
| streamRec.descriptor.pointer = stream; |
| streamRec.read = sk_stream_read; |
| streamRec.close = sk_stream_close; |
| |
| args.flags = FT_OPEN_STREAM; |
| args.stream = &streamRec; |
| } |
| |
| FT_Face face; |
| if (FT_Open_Face(library, &args, 0, &face)) { |
| FT_Done_FreeType(library); |
| return false; |
| } |
| |
| int tempStyle = SkTypeface::kNormal; |
| if (face->style_flags & FT_STYLE_FLAG_BOLD) { |
| tempStyle |= SkTypeface::kBold; |
| } |
| if (face->style_flags & FT_STYLE_FLAG_ITALIC) { |
| tempStyle |= SkTypeface::kItalic; |
| } |
| |
| if (name) { |
| name->set(face->family_name); |
| } |
| if (style) { |
| *style = (SkTypeface::Style) tempStyle; |
| } |
| if (isFixedWidth) { |
| *isFixedWidth = FT_IS_FIXED_WIDTH(face); |
| } |
| |
| FT_Done_Face(face); |
| FT_Done_FreeType(library); |
| return true; |
| } |
