epoger@google.com | ec3ed6a | 2011-07-28 14:26:00 +0000 | [diff] [blame] | 1 | |
| 2 | /* |
| 3 | * Copyright 2006 The Android Open Source Project |
| 4 | * |
| 5 | * Use of this source code is governed by a BSD-style license that can be |
| 6 | * found in the LICENSE file. |
| 7 | */ |
| 8 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 9 | #include "SkBitmap.h" |
| 10 | #include "SkCanvas.h" |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 11 | #include "SkColorPriv.h" |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 12 | #include "SkDescriptor.h" |
| 13 | #include "SkFDot6.h" |
bungeman@google.com | 3aacb41 | 2012-03-13 14:55:12 +0000 | [diff] [blame] | 14 | #include "SkFloatingPoint.h" |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 15 | #include "SkFontHost.h" |
george@mozilla.com | c59b5da | 2012-08-23 00:39:08 +0000 | [diff] [blame] | 16 | #include "SkFontHost_FreeType_common.h" |
bungeman@google.com | bbe5013 | 2012-07-24 20:33:21 +0000 | [diff] [blame] | 17 | #include "SkGlyph.h" |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 18 | #include "SkMask.h" |
bungeman@google.com | 97efada | 2012-07-30 20:40:50 +0000 | [diff] [blame] | 19 | #include "SkMaskGamma.h" |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 20 | #include "SkAdvancedTypefaceMetrics.h" |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 21 | #include "SkScalerContext.h" |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 22 | #include "SkStream.h" |
| 23 | #include "SkString.h" |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 24 | #include "SkTemplates.h" |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 25 | #include "SkThread.h" |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 26 | |
bungeman@google.com | fd668cf | 2012-08-24 17:46:11 +0000 | [diff] [blame] | 27 | #if defined(SK_CAN_USE_DLOPEN) |
| 28 | #include <dlfcn.h> |
| 29 | #endif |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 30 | #include <ft2build.h> |
| 31 | #include FT_FREETYPE_H |
| 32 | #include FT_OUTLINE_H |
| 33 | #include FT_SIZES_H |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 34 | #include FT_TRUETYPE_TABLES_H |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 35 | #include FT_TYPE1_TABLES_H |
agl@chromium.org | e76073b | 2010-06-04 20:31:17 +0000 | [diff] [blame] | 36 | #include FT_BITMAP_H |
agl@chromium.org | 36bb697 | 2010-06-04 20:57:16 +0000 | [diff] [blame] | 37 | // In the past, FT_GlyphSlot_Own_Bitmap was defined in this header file. |
| 38 | #include FT_SYNTHESIS_H |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 39 | #include FT_XFREE86_H |
epoger@google.com | 5070d79 | 2011-06-29 20:43:14 +0000 | [diff] [blame] | 40 | #ifdef FT_LCD_FILTER_H |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame] | 41 | #include FT_LCD_FILTER_H |
epoger@google.com | 5070d79 | 2011-06-29 20:43:14 +0000 | [diff] [blame] | 42 | #endif |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame] | 43 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 44 | #ifdef FT_ADVANCES_H |
| 45 | #include FT_ADVANCES_H |
| 46 | #endif |
| 47 | |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 48 | #if 0 |
| 49 | // Also include the files by name for build tools which require this. |
| 50 | #include <freetype/freetype.h> |
| 51 | #include <freetype/ftoutln.h> |
| 52 | #include <freetype/ftsizes.h> |
| 53 | #include <freetype/tttables.h> |
| 54 | #include <freetype/ftadvanc.h> |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame] | 55 | #include <freetype/ftlcdfil.h> |
agl@chromium.org | e76073b | 2010-06-04 20:31:17 +0000 | [diff] [blame] | 56 | #include <freetype/ftbitmap.h> |
agl@chromium.org | 36bb697 | 2010-06-04 20:57:16 +0000 | [diff] [blame] | 57 | #include <freetype/ftsynth.h> |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 58 | #endif |
| 59 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 60 | //#define ENABLE_GLYPH_SPEW // for tracing calls |
| 61 | //#define DUMP_STRIKE_CREATION |
| 62 | |
reed@google.com | 1ac8350 | 2012-02-28 17:06:02 +0000 | [diff] [blame] | 63 | //#define SK_GAMMA_APPLY_TO_A8 |
reed@google.com | 1ac8350 | 2012-02-28 17:06:02 +0000 | [diff] [blame] | 64 | |
vandebo@chromium.org | 6f72d1e | 2011-02-14 23:19:59 +0000 | [diff] [blame] | 65 | using namespace skia_advanced_typeface_metrics_utils; |
| 66 | |
reed@google.com | effc501 | 2011-06-27 16:44:46 +0000 | [diff] [blame] | 67 | static bool isLCD(const SkScalerContext::Rec& rec) { |
| 68 | switch (rec.fMaskFormat) { |
| 69 | case SkMask::kLCD16_Format: |
| 70 | case SkMask::kLCD32_Format: |
| 71 | return true; |
| 72 | default: |
| 73 | return false; |
| 74 | } |
| 75 | } |
| 76 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 77 | ////////////////////////////////////////////////////////////////////////// |
| 78 | |
| 79 | struct SkFaceRec; |
| 80 | |
digit@google.com | 1771cbf | 2012-01-26 21:26:40 +0000 | [diff] [blame] | 81 | SK_DECLARE_STATIC_MUTEX(gFTMutex); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 82 | static int gFTCount; |
| 83 | static FT_Library gFTLibrary; |
| 84 | static SkFaceRec* gFaceRecHead; |
agl@chromium.org | f18d876 | 2009-07-28 18:38:08 +0000 | [diff] [blame] | 85 | static bool gLCDSupportValid; // true iff |gLCDSupport| has been set. |
| 86 | static bool gLCDSupport; // true iff LCD is supported by the runtime. |
reed@google.com | a1c3256 | 2012-03-01 19:38:23 +0000 | [diff] [blame] | 87 | static int gLCDExtra; // number of extra pixels for filtering. |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 88 | |
bungeman@google.com | fd668cf | 2012-08-24 17:46:11 +0000 | [diff] [blame] | 89 | // FT_Library_SetLcdFilterWeights was introduced in FreeType 2.4.0. |
| 90 | // The following platforms provide FreeType of at least 2.4.0. |
| 91 | // Ubuntu >= 11.04 (previous deprecated April 2013) |
| 92 | // Debian >= 6.0 (good) |
| 93 | // OpenSuse >= 11.4 (previous deprecated January 2012 / Nov 2013 for Evergreen 11.2) |
| 94 | // Fedora >= 14 (good) |
| 95 | // Android >= Gingerbread (good) |
| 96 | typedef FT_Error (*FT_Library_SetLcdFilterWeightsProc)(FT_Library, unsigned char*); |
| 97 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 98 | ///////////////////////////////////////////////////////////////////////// |
| 99 | |
bungeman@google.com | fd668cf | 2012-08-24 17:46:11 +0000 | [diff] [blame] | 100 | static bool InitFreetype() { |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame] | 101 | FT_Error err = FT_Init_FreeType(&gFTLibrary); |
reed@google.com | ea2333d | 2011-03-14 16:44:56 +0000 | [diff] [blame] | 102 | if (err) { |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame] | 103 | return false; |
reed@google.com | ea2333d | 2011-03-14 16:44:56 +0000 | [diff] [blame] | 104 | } |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame] | 105 | |
bungeman@google.com | fd668cf | 2012-08-24 17:46:11 +0000 | [diff] [blame] | 106 | // Setup LCD filtering. This reduces color fringes for LCD smoothed glyphs. |
epoger@google.com | b371ed1 | 2011-06-29 21:20:52 +0000 | [diff] [blame] | 107 | #ifdef FT_LCD_FILTER_H |
bungeman@google.com | fd668cf | 2012-08-24 17:46:11 +0000 | [diff] [blame] | 108 | //Use light as default, as FT_LCD_FILTER_DEFAULT adds up to 0x110. |
| 109 | err = FT_Library_SetLcdFilter(gFTLibrary, FT_LCD_FILTER_LIGHT); |
| 110 | if (0 == err) { |
| 111 | gLCDSupport = true; |
| 112 | gLCDExtra = 2; //Using a filter adds one full pixel to each side. |
| 113 | |
| 114 | static unsigned char gaussianLikeWeights[] = { 0x17, 0x40, 0x52, 0x40, 0x17 }; |
| 115 | //static unsigned char triangleLikeWeights[] = { 0x1C, 0x39, 0x56, 0x39, 0x1C }; |
| 116 | |
| 117 | #if defined(SK_FONTHOST_FREETYPE_RUNTIME_VERSION) && \ |
| 118 | SK_FONTHOST_FREETYPE_RUNTIME_VERSION > 0x020400 |
| 119 | err = FT_Library_SetLcdFilterWeights(gFTLibrary, gaussianLikeWeights); |
| 120 | #elif defined(SK_CAN_USE_DLOPEN) && SK_CAN_USE_DLOPEN == 1 |
| 121 | //The FreeType library is already loaded, so symbols are available in process. |
| 122 | void* self = dlopen(NULL, RTLD_LAZY); |
| 123 | if (NULL != self) { |
| 124 | FT_Library_SetLcdFilterWeightsProc setLcdFilterWeights; |
| 125 | //The following cast is non-standard, but safe for POSIX. |
| 126 | *reinterpret_cast<void**>(&setLcdFilterWeights) = dlsym(self, "FT_Library_SetLcdFilterWeights"); |
| 127 | dlclose(self); |
| 128 | |
| 129 | if (NULL != setLcdFilterWeights) { |
| 130 | err = setLcdFilterWeights(gFTLibrary, gaussianLikeWeights); |
| 131 | } |
| 132 | } |
| 133 | #endif |
reed@google.com | a1c3256 | 2012-03-01 19:38:23 +0000 | [diff] [blame] | 134 | } |
epoger@google.com | 5070d79 | 2011-06-29 20:43:14 +0000 | [diff] [blame] | 135 | #else |
| 136 | gLCDSupport = false; |
| 137 | #endif |
reed@android.com | 61608aa | 2009-07-31 14:52:54 +0000 | [diff] [blame] | 138 | gLCDSupportValid = true; |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame] | 139 | |
| 140 | return true; |
| 141 | } |
| 142 | |
george@mozilla.com | c59b5da | 2012-08-23 00:39:08 +0000 | [diff] [blame] | 143 | class SkScalerContext_FreeType : public SkScalerContext_FreeType_Base { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 144 | public: |
| 145 | SkScalerContext_FreeType(const SkDescriptor* desc); |
| 146 | virtual ~SkScalerContext_FreeType(); |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 147 | |
reed@android.com | 62900b4 | 2009-02-11 15:07:19 +0000 | [diff] [blame] | 148 | bool success() const { |
reed@android.com | a0f5d15 | 2009-06-22 17:38:10 +0000 | [diff] [blame] | 149 | return fFaceRec != NULL && |
| 150 | fFTSize != NULL && |
| 151 | fFace != NULL; |
reed@android.com | 62900b4 | 2009-02-11 15:07:19 +0000 | [diff] [blame] | 152 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 153 | |
| 154 | protected: |
ctguil@chromium.org | 0bc7bf5 | 2011-03-04 19:04:57 +0000 | [diff] [blame] | 155 | virtual unsigned generateGlyphCount(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 156 | virtual uint16_t generateCharToGlyph(SkUnichar uni); |
| 157 | virtual void generateAdvance(SkGlyph* glyph); |
| 158 | virtual void generateMetrics(SkGlyph* glyph); |
bungeman@google.com | 97efada | 2012-07-30 20:40:50 +0000 | [diff] [blame] | 159 | virtual void generateImage(const SkGlyph& glyph, SkMaskGamma::PreBlend* maskPreBlend); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 160 | virtual void generatePath(const SkGlyph& glyph, SkPath* path); |
| 161 | virtual void generateFontMetrics(SkPaint::FontMetrics* mx, |
| 162 | SkPaint::FontMetrics* my); |
reed@android.com | 9d3a985 | 2010-01-08 14:07:42 +0000 | [diff] [blame] | 163 | virtual SkUnichar generateGlyphToChar(uint16_t glyph); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 164 | |
| 165 | private: |
| 166 | SkFaceRec* fFaceRec; |
| 167 | FT_Face fFace; // reference to shared face in gFaceRecHead |
| 168 | FT_Size fFTSize; // our own copy |
| 169 | SkFixed fScaleX, fScaleY; |
| 170 | FT_Matrix fMatrix22; |
| 171 | uint32_t fLoadGlyphFlags; |
reed@google.com | bdc9988 | 2011-11-21 14:36:57 +0000 | [diff] [blame] | 172 | bool fDoLinearMetrics; |
reed@google.com | a1bfa21 | 2012-03-08 21:57:12 +0000 | [diff] [blame] | 173 | bool fLCDIsVert; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 174 | |
| 175 | FT_Error setupSize(); |
djsollen@google.com | d8b599c | 2012-03-19 19:44:19 +0000 | [diff] [blame] | 176 | void getBBoxForCurrentGlyph(SkGlyph* glyph, FT_BBox* bbox, |
| 177 | bool snapToPixelBoundary = false); |
| 178 | void updateGlyphIfLCD(SkGlyph* glyph); |
bungeman@google.com | 875eb98 | 2012-04-12 15:53:23 +0000 | [diff] [blame] | 179 | void updateGlyphPosIfLCD(SkGlyph* glyph); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 180 | }; |
| 181 | |
| 182 | /////////////////////////////////////////////////////////////////////////// |
| 183 | /////////////////////////////////////////////////////////////////////////// |
| 184 | |
| 185 | #include "SkStream.h" |
| 186 | |
| 187 | struct SkFaceRec { |
| 188 | SkFaceRec* fNext; |
| 189 | FT_Face fFace; |
| 190 | FT_StreamRec fFTStream; |
| 191 | SkStream* fSkStream; |
| 192 | uint32_t fRefCnt; |
| 193 | uint32_t fFontID; |
| 194 | |
reed@android.com | b1d9d2e | 2009-03-04 17:37:51 +0000 | [diff] [blame] | 195 | // assumes ownership of the stream, will call unref() when its done |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 196 | SkFaceRec(SkStream* strm, uint32_t fontID); |
| 197 | ~SkFaceRec() { |
reed@android.com | b1d9d2e | 2009-03-04 17:37:51 +0000 | [diff] [blame] | 198 | fSkStream->unref(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 199 | } |
| 200 | }; |
| 201 | |
| 202 | extern "C" { |
| 203 | static unsigned long sk_stream_read(FT_Stream stream, |
| 204 | unsigned long offset, |
| 205 | unsigned char* buffer, |
| 206 | unsigned long count ) { |
| 207 | SkStream* str = (SkStream*)stream->descriptor.pointer; |
| 208 | |
| 209 | if (count) { |
| 210 | if (!str->rewind()) { |
| 211 | return 0; |
| 212 | } else { |
| 213 | unsigned long ret; |
| 214 | if (offset) { |
| 215 | ret = str->read(NULL, offset); |
| 216 | if (ret != offset) { |
| 217 | return 0; |
| 218 | } |
| 219 | } |
| 220 | ret = str->read(buffer, count); |
| 221 | if (ret != count) { |
| 222 | return 0; |
| 223 | } |
| 224 | count = ret; |
| 225 | } |
| 226 | } |
| 227 | return count; |
| 228 | } |
| 229 | |
| 230 | static void sk_stream_close( FT_Stream stream) {} |
| 231 | } |
| 232 | |
| 233 | SkFaceRec::SkFaceRec(SkStream* strm, uint32_t fontID) |
vandebo@chromium.org | 9af25f3 | 2012-03-28 21:24:27 +0000 | [diff] [blame] | 234 | : fNext(NULL), fSkStream(strm), fRefCnt(1), fFontID(fontID) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 235 | // SkDEBUGF(("SkFaceRec: opening %s (%p)\n", key.c_str(), strm)); |
| 236 | |
reed@android.com | 4516f47 | 2009-06-29 16:25:36 +0000 | [diff] [blame] | 237 | sk_bzero(&fFTStream, sizeof(fFTStream)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 238 | fFTStream.size = fSkStream->getLength(); |
| 239 | fFTStream.descriptor.pointer = fSkStream; |
| 240 | fFTStream.read = sk_stream_read; |
| 241 | fFTStream.close = sk_stream_close; |
| 242 | } |
| 243 | |
reed@android.com | 62900b4 | 2009-02-11 15:07:19 +0000 | [diff] [blame] | 244 | // Will return 0 on failure |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 245 | static SkFaceRec* ref_ft_face(uint32_t fontID) { |
| 246 | SkFaceRec* rec = gFaceRecHead; |
| 247 | while (rec) { |
| 248 | if (rec->fFontID == fontID) { |
| 249 | SkASSERT(rec->fFace); |
| 250 | rec->fRefCnt += 1; |
| 251 | return rec; |
| 252 | } |
| 253 | rec = rec->fNext; |
| 254 | } |
| 255 | |
| 256 | SkStream* strm = SkFontHost::OpenStream(fontID); |
| 257 | if (NULL == strm) { |
| 258 | SkDEBUGF(("SkFontHost::OpenStream failed opening %x\n", fontID)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 259 | return 0; |
| 260 | } |
| 261 | |
| 262 | // this passes ownership of strm to the rec |
| 263 | rec = SkNEW_ARGS(SkFaceRec, (strm, fontID)); |
| 264 | |
| 265 | FT_Open_Args args; |
| 266 | memset(&args, 0, sizeof(args)); |
| 267 | const void* memoryBase = strm->getMemoryBase(); |
| 268 | |
| 269 | if (NULL != memoryBase) { |
| 270 | //printf("mmap(%s)\n", keyString.c_str()); |
| 271 | args.flags = FT_OPEN_MEMORY; |
| 272 | args.memory_base = (const FT_Byte*)memoryBase; |
| 273 | args.memory_size = strm->getLength(); |
| 274 | } else { |
| 275 | //printf("fopen(%s)\n", keyString.c_str()); |
| 276 | args.flags = FT_OPEN_STREAM; |
| 277 | args.stream = &rec->fFTStream; |
| 278 | } |
| 279 | |
agl@chromium.org | 61a678a | 2010-08-06 18:08:18 +0000 | [diff] [blame] | 280 | int face_index; |
| 281 | int length = SkFontHost::GetFileName(fontID, NULL, 0, &face_index); |
| 282 | FT_Error err = FT_Open_Face(gFTLibrary, &args, length ? face_index : 0, |
| 283 | &rec->fFace); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 284 | |
| 285 | if (err) { // bad filename, try the default font |
| 286 | fprintf(stderr, "ERROR: unable to open font '%x'\n", fontID); |
| 287 | SkDELETE(rec); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 288 | return 0; |
| 289 | } else { |
| 290 | SkASSERT(rec->fFace); |
| 291 | //fprintf(stderr, "Opened font '%s'\n", filename.c_str()); |
| 292 | rec->fNext = gFaceRecHead; |
| 293 | gFaceRecHead = rec; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 294 | return rec; |
| 295 | } |
| 296 | } |
| 297 | |
| 298 | static void unref_ft_face(FT_Face face) { |
| 299 | SkFaceRec* rec = gFaceRecHead; |
| 300 | SkFaceRec* prev = NULL; |
| 301 | while (rec) { |
| 302 | SkFaceRec* next = rec->fNext; |
| 303 | if (rec->fFace == face) { |
| 304 | if (--rec->fRefCnt == 0) { |
| 305 | if (prev) { |
| 306 | prev->fNext = next; |
| 307 | } else { |
| 308 | gFaceRecHead = next; |
| 309 | } |
| 310 | FT_Done_Face(face); |
| 311 | SkDELETE(rec); |
| 312 | } |
| 313 | return; |
| 314 | } |
| 315 | prev = rec; |
| 316 | rec = next; |
| 317 | } |
tomhudson@google.com | 0c00f21 | 2011-12-28 14:59:50 +0000 | [diff] [blame] | 318 | SkDEBUGFAIL("shouldn't get here, face not in list"); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 319 | } |
| 320 | |
| 321 | /////////////////////////////////////////////////////////////////////////// |
| 322 | |
vandebo@chromium.org | 16be6b8 | 2011-01-28 21:28:56 +0000 | [diff] [blame] | 323 | // Work around for old versions of freetype. |
| 324 | static FT_Error getAdvances(FT_Face face, FT_UInt start, FT_UInt count, |
| 325 | FT_Int32 loadFlags, FT_Fixed* advances) { |
| 326 | #ifdef FT_ADVANCES_H |
| 327 | return FT_Get_Advances(face, start, count, loadFlags, advances); |
| 328 | #else |
| 329 | if (!face || start >= face->num_glyphs || |
| 330 | start + count > face->num_glyphs || loadFlags != FT_LOAD_NO_SCALE) { |
| 331 | return 6; // "Invalid argument." |
| 332 | } |
| 333 | if (count == 0) |
| 334 | return 0; |
| 335 | |
| 336 | for (int i = 0; i < count; i++) { |
| 337 | FT_Error err = FT_Load_Glyph(face, start + i, FT_LOAD_NO_SCALE); |
| 338 | if (err) |
| 339 | return err; |
| 340 | advances[i] = face->glyph->advance.x; |
| 341 | } |
| 342 | |
| 343 | return 0; |
| 344 | #endif |
| 345 | } |
| 346 | |
| 347 | static bool canEmbed(FT_Face face) { |
djsollen@google.com | fa394d4 | 2012-01-09 20:40:25 +0000 | [diff] [blame] | 348 | #ifdef FT_FSTYPE_RESTRICTED_LICENSE_EMBEDDING |
vandebo@chromium.org | 16be6b8 | 2011-01-28 21:28:56 +0000 | [diff] [blame] | 349 | FT_UShort fsType = FT_Get_FSType_Flags(face); |
| 350 | return (fsType & (FT_FSTYPE_RESTRICTED_LICENSE_EMBEDDING | |
| 351 | FT_FSTYPE_BITMAP_EMBEDDING_ONLY)) == 0; |
| 352 | #else |
| 353 | // No embedding is 0x2 and bitmap embedding only is 0x200. |
| 354 | TT_OS2* os2_table; |
| 355 | if ((os2_table = (TT_OS2*)FT_Get_Sfnt_Table(face, ft_sfnt_os2)) != NULL) { |
| 356 | return (os2_table->fsType & 0x202) == 0; |
| 357 | } |
| 358 | return false; // We tried, fail safe. |
| 359 | #endif |
| 360 | } |
| 361 | |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 362 | static bool GetLetterCBox(FT_Face face, char letter, FT_BBox* bbox) { |
| 363 | const FT_UInt glyph_id = FT_Get_Char_Index(face, letter); |
| 364 | if (!glyph_id) |
| 365 | return false; |
| 366 | FT_Load_Glyph(face, glyph_id, FT_LOAD_NO_SCALE); |
| 367 | FT_Outline_Get_CBox(&face->glyph->outline, bbox); |
| 368 | return true; |
| 369 | } |
| 370 | |
vandebo@chromium.org | 6f72d1e | 2011-02-14 23:19:59 +0000 | [diff] [blame] | 371 | static bool getWidthAdvance(FT_Face face, int gId, int16_t* data) { |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 372 | FT_Fixed advance = 0; |
vandebo@chromium.org | 6f72d1e | 2011-02-14 23:19:59 +0000 | [diff] [blame] | 373 | if (getAdvances(face, gId, 1, FT_LOAD_NO_SCALE, &advance)) { |
| 374 | return false; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 375 | } |
vandebo@chromium.org | 6f72d1e | 2011-02-14 23:19:59 +0000 | [diff] [blame] | 376 | SkASSERT(data); |
| 377 | *data = advance; |
| 378 | return true; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 379 | } |
| 380 | |
vandebo@chromium.org | 6744d49 | 2011-05-09 18:13:47 +0000 | [diff] [blame] | 381 | static void populate_glyph_to_unicode(FT_Face& face, |
| 382 | SkTDArray<SkUnichar>* glyphToUnicode) { |
| 383 | // Check and see if we have Unicode cmaps. |
| 384 | for (int i = 0; i < face->num_charmaps; ++i) { |
| 385 | // CMaps known to support Unicode: |
| 386 | // Platform ID Encoding ID Name |
| 387 | // ----------- ----------- ----------------------------------- |
| 388 | // 0 0,1 Apple Unicode |
| 389 | // 0 3 Apple Unicode 2.0 (preferred) |
| 390 | // 3 1 Microsoft Unicode UCS-2 |
| 391 | // 3 10 Microsoft Unicode UCS-4 (preferred) |
| 392 | // |
| 393 | // See Apple TrueType Reference Manual |
| 394 | // http://developer.apple.com/fonts/TTRefMan/RM06/Chap6cmap.html |
| 395 | // http://developer.apple.com/fonts/TTRefMan/RM06/Chap6name.html#ID |
| 396 | // Microsoft OpenType Specification |
| 397 | // http://www.microsoft.com/typography/otspec/cmap.htm |
| 398 | |
| 399 | FT_UShort platformId = face->charmaps[i]->platform_id; |
| 400 | FT_UShort encodingId = face->charmaps[i]->encoding_id; |
| 401 | |
| 402 | if (platformId != 0 && platformId != 3) { |
| 403 | continue; |
| 404 | } |
| 405 | if (platformId == 3 && encodingId != 1 && encodingId != 10) { |
| 406 | continue; |
| 407 | } |
| 408 | bool preferredMap = ((platformId == 3 && encodingId == 10) || |
| 409 | (platformId == 0 && encodingId == 3)); |
| 410 | |
| 411 | FT_Set_Charmap(face, face->charmaps[i]); |
| 412 | if (glyphToUnicode->isEmpty()) { |
| 413 | glyphToUnicode->setCount(face->num_glyphs); |
| 414 | memset(glyphToUnicode->begin(), 0, |
| 415 | sizeof(SkUnichar) * face->num_glyphs); |
| 416 | } |
| 417 | |
| 418 | // Iterate through each cmap entry. |
| 419 | FT_UInt glyphIndex; |
| 420 | for (SkUnichar charCode = FT_Get_First_Char(face, &glyphIndex); |
| 421 | glyphIndex != 0; |
| 422 | charCode = FT_Get_Next_Char(face, charCode, &glyphIndex)) { |
| 423 | if (charCode && |
| 424 | ((*glyphToUnicode)[glyphIndex] == 0 || preferredMap)) { |
| 425 | (*glyphToUnicode)[glyphIndex] = charCode; |
| 426 | } |
| 427 | } |
| 428 | } |
| 429 | } |
| 430 | |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 431 | // static |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 432 | SkAdvancedTypefaceMetrics* SkFontHost::GetAdvancedTypefaceMetrics( |
vandebo@chromium.org | 325cb9a | 2011-03-30 18:36:29 +0000 | [diff] [blame] | 433 | uint32_t fontID, |
vandebo@chromium.org | 37ad8fb | 2011-08-18 02:38:50 +0000 | [diff] [blame] | 434 | SkAdvancedTypefaceMetrics::PerGlyphInfo perGlyphInfo, |
| 435 | const uint32_t* glyphIDs, |
| 436 | uint32_t glyphIDsCount) { |
djsollen@google.com | da95772 | 2011-11-16 17:00:46 +0000 | [diff] [blame] | 437 | #if defined(SK_BUILD_FOR_MAC) |
reed@google.com | 8a5d692 | 2011-03-14 15:08:03 +0000 | [diff] [blame] | 438 | return NULL; |
| 439 | #else |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 440 | SkAutoMutexAcquire ac(gFTMutex); |
| 441 | FT_Library libInit = NULL; |
| 442 | if (gFTCount == 0) { |
| 443 | if (!InitFreetype()) |
| 444 | sk_throw(); |
| 445 | libInit = gFTLibrary; |
| 446 | } |
| 447 | SkAutoTCallIProc<struct FT_LibraryRec_, FT_Done_FreeType> ftLib(libInit); |
| 448 | SkFaceRec* rec = ref_ft_face(fontID); |
| 449 | if (NULL == rec) |
| 450 | return NULL; |
| 451 | FT_Face face = rec->fFace; |
| 452 | |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 453 | SkAdvancedTypefaceMetrics* info = new SkAdvancedTypefaceMetrics; |
| 454 | info->fFontName.set(FT_Get_Postscript_Name(face)); |
| 455 | info->fMultiMaster = FT_HAS_MULTIPLE_MASTERS(face); |
| 456 | info->fLastGlyphID = face->num_glyphs - 1; |
| 457 | info->fEmSize = 1000; |
| 458 | |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 459 | bool cid = false; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 460 | const char* fontType = FT_Get_X11_Font_Format(face); |
vandebo@chromium.org | c3a2ae5 | 2011-02-03 21:48:23 +0000 | [diff] [blame] | 461 | if (strcmp(fontType, "Type 1") == 0) { |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 462 | info->fType = SkAdvancedTypefaceMetrics::kType1_Font; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 463 | } else if (strcmp(fontType, "CID Type 1") == 0) { |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 464 | info->fType = SkAdvancedTypefaceMetrics::kType1CID_Font; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 465 | cid = true; |
| 466 | } else if (strcmp(fontType, "CFF") == 0) { |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 467 | info->fType = SkAdvancedTypefaceMetrics::kCFF_Font; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 468 | } else if (strcmp(fontType, "TrueType") == 0) { |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 469 | info->fType = SkAdvancedTypefaceMetrics::kTrueType_Font; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 470 | cid = true; |
| 471 | TT_Header* ttHeader; |
| 472 | if ((ttHeader = (TT_Header*)FT_Get_Sfnt_Table(face, |
| 473 | ft_sfnt_head)) != NULL) { |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 474 | info->fEmSize = ttHeader->Units_Per_EM; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 475 | } |
| 476 | } |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 477 | |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 478 | info->fStyle = 0; |
| 479 | if (FT_IS_FIXED_WIDTH(face)) |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 480 | info->fStyle |= SkAdvancedTypefaceMetrics::kFixedPitch_Style; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 481 | if (face->style_flags & FT_STYLE_FLAG_ITALIC) |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 482 | info->fStyle |= SkAdvancedTypefaceMetrics::kItalic_Style; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 483 | // We should set either Symbolic or Nonsymbolic; Nonsymbolic if the font's |
| 484 | // character set is a subset of 'Adobe standard Latin.' |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 485 | info->fStyle |= SkAdvancedTypefaceMetrics::kSymbolic_Style; |
| 486 | |
| 487 | PS_FontInfoRec ps_info; |
| 488 | TT_Postscript* tt_info; |
| 489 | if (FT_Get_PS_Font_Info(face, &ps_info) == 0) { |
| 490 | info->fItalicAngle = ps_info.italic_angle; |
| 491 | } else if ((tt_info = |
| 492 | (TT_Postscript*)FT_Get_Sfnt_Table(face, |
| 493 | ft_sfnt_post)) != NULL) { |
| 494 | info->fItalicAngle = SkFixedToScalar(tt_info->italicAngle); |
| 495 | } else { |
| 496 | info->fItalicAngle = 0; |
| 497 | } |
| 498 | |
| 499 | info->fAscent = face->ascender; |
| 500 | info->fDescent = face->descender; |
| 501 | |
| 502 | // Figure out a good guess for StemV - Min width of i, I, !, 1. |
| 503 | // This probably isn't very good with an italic font. |
| 504 | int16_t min_width = SHRT_MAX; |
vandebo@chromium.org | 6f72d1e | 2011-02-14 23:19:59 +0000 | [diff] [blame] | 505 | info->fStemV = 0; |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 506 | char stem_chars[] = {'i', 'I', '!', '1'}; |
| 507 | for (size_t i = 0; i < SK_ARRAY_COUNT(stem_chars); i++) { |
| 508 | FT_BBox bbox; |
| 509 | if (GetLetterCBox(face, stem_chars[i], &bbox)) { |
| 510 | int16_t width = bbox.xMax - bbox.xMin; |
| 511 | if (width > 0 && width < min_width) { |
| 512 | min_width = width; |
| 513 | info->fStemV = min_width; |
| 514 | } |
| 515 | } |
| 516 | } |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 517 | |
| 518 | TT_PCLT* pclt_info; |
| 519 | TT_OS2* os2_table; |
| 520 | if ((pclt_info = (TT_PCLT*)FT_Get_Sfnt_Table(face, ft_sfnt_pclt)) != NULL) { |
| 521 | info->fCapHeight = pclt_info->CapHeight; |
| 522 | uint8_t serif_style = pclt_info->SerifStyle & 0x3F; |
| 523 | if (serif_style >= 2 && serif_style <= 6) |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 524 | info->fStyle |= SkAdvancedTypefaceMetrics::kSerif_Style; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 525 | else if (serif_style >= 9 && serif_style <= 12) |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 526 | info->fStyle |= SkAdvancedTypefaceMetrics::kScript_Style; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 527 | } else if ((os2_table = |
| 528 | (TT_OS2*)FT_Get_Sfnt_Table(face, ft_sfnt_os2)) != NULL) { |
| 529 | info->fCapHeight = os2_table->sCapHeight; |
| 530 | } else { |
| 531 | // Figure out a good guess for CapHeight: average the height of M and X. |
| 532 | FT_BBox m_bbox, x_bbox; |
| 533 | bool got_m, got_x; |
| 534 | got_m = GetLetterCBox(face, 'M', &m_bbox); |
| 535 | got_x = GetLetterCBox(face, 'X', &x_bbox); |
| 536 | if (got_m && got_x) { |
| 537 | info->fCapHeight = (m_bbox.yMax - m_bbox.yMin + x_bbox.yMax - |
| 538 | x_bbox.yMin) / 2; |
| 539 | } else if (got_m && !got_x) { |
| 540 | info->fCapHeight = m_bbox.yMax - m_bbox.yMin; |
| 541 | } else if (!got_m && got_x) { |
| 542 | info->fCapHeight = x_bbox.yMax - x_bbox.yMin; |
| 543 | } |
| 544 | } |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 545 | |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 546 | info->fBBox = SkIRect::MakeLTRB(face->bbox.xMin, face->bbox.yMax, |
| 547 | face->bbox.xMax, face->bbox.yMin); |
| 548 | |
vandebo@chromium.org | 37ad8fb | 2011-08-18 02:38:50 +0000 | [diff] [blame] | 549 | if (!canEmbed(face) || !FT_IS_SCALABLE(face) || |
vandebo@chromium.org | 325cb9a | 2011-03-30 18:36:29 +0000 | [diff] [blame] | 550 | info->fType == SkAdvancedTypefaceMetrics::kOther_Font) { |
| 551 | perGlyphInfo = SkAdvancedTypefaceMetrics::kNo_PerGlyphInfo; |
| 552 | } |
| 553 | |
| 554 | if (perGlyphInfo & SkAdvancedTypefaceMetrics::kHAdvance_PerGlyphInfo) { |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 555 | if (FT_IS_FIXED_WIDTH(face)) { |
| 556 | appendRange(&info->fGlyphWidths, 0); |
| 557 | int16_t advance = face->max_advance_width; |
| 558 | info->fGlyphWidths->fAdvance.append(1, &advance); |
| 559 | finishRange(info->fGlyphWidths.get(), 0, |
| 560 | SkAdvancedTypefaceMetrics::WidthRange::kDefault); |
vandebo@chromium.org | 6f72d1e | 2011-02-14 23:19:59 +0000 | [diff] [blame] | 561 | } else if (!cid) { |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 562 | appendRange(&info->fGlyphWidths, 0); |
| 563 | // So as to not blow out the stack, get advances in batches. |
| 564 | for (int gID = 0; gID < face->num_glyphs; gID += 128) { |
| 565 | FT_Fixed advances[128]; |
| 566 | int advanceCount = 128; |
| 567 | if (gID + advanceCount > face->num_glyphs) |
| 568 | advanceCount = face->num_glyphs - gID + 1; |
| 569 | getAdvances(face, gID, advanceCount, FT_LOAD_NO_SCALE, |
| 570 | advances); |
| 571 | for (int i = 0; i < advanceCount; i++) { |
| 572 | int16_t advance = advances[gID + i]; |
| 573 | info->fGlyphWidths->fAdvance.append(1, &advance); |
| 574 | } |
| 575 | } |
| 576 | finishRange(info->fGlyphWidths.get(), face->num_glyphs - 1, |
| 577 | SkAdvancedTypefaceMetrics::WidthRange::kRange); |
| 578 | } else { |
vandebo@chromium.org | 6f72d1e | 2011-02-14 23:19:59 +0000 | [diff] [blame] | 579 | info->fGlyphWidths.reset( |
vandebo@chromium.org | 37ad8fb | 2011-08-18 02:38:50 +0000 | [diff] [blame] | 580 | getAdvanceData(face, |
| 581 | face->num_glyphs, |
| 582 | glyphIDs, |
| 583 | glyphIDsCount, |
| 584 | &getWidthAdvance)); |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 585 | } |
vandebo@chromium.org | 325cb9a | 2011-03-30 18:36:29 +0000 | [diff] [blame] | 586 | } |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 587 | |
vandebo@chromium.org | 325cb9a | 2011-03-30 18:36:29 +0000 | [diff] [blame] | 588 | if (perGlyphInfo & SkAdvancedTypefaceMetrics::kVAdvance_PerGlyphInfo && |
| 589 | FT_HAS_VERTICAL(face)) { |
| 590 | SkASSERT(false); // Not implemented yet. |
| 591 | } |
| 592 | |
| 593 | if (perGlyphInfo & SkAdvancedTypefaceMetrics::kGlyphNames_PerGlyphInfo && |
| 594 | info->fType == SkAdvancedTypefaceMetrics::kType1_Font) { |
| 595 | // Postscript fonts may contain more than 255 glyphs, so we end up |
| 596 | // using multiple font descriptions with a glyph ordering. Record |
| 597 | // the name of each glyph. |
| 598 | info->fGlyphNames.reset( |
| 599 | new SkAutoTArray<SkString>(face->num_glyphs)); |
| 600 | for (int gID = 0; gID < face->num_glyphs; gID++) { |
| 601 | char glyphName[128]; // PS limit for names is 127 bytes. |
| 602 | FT_Get_Glyph_Name(face, gID, glyphName, 128); |
| 603 | info->fGlyphNames->get()[gID].set(glyphName); |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 604 | } |
| 605 | } |
| 606 | |
vandebo@chromium.org | 6744d49 | 2011-05-09 18:13:47 +0000 | [diff] [blame] | 607 | if (perGlyphInfo & SkAdvancedTypefaceMetrics::kToUnicode_PerGlyphInfo && |
| 608 | info->fType != SkAdvancedTypefaceMetrics::kType1_Font && |
| 609 | face->num_charmaps) { |
| 610 | populate_glyph_to_unicode(face, &(info->fGlyphToUnicode)); |
| 611 | } |
| 612 | |
vandebo@chromium.org | c3a2ae5 | 2011-02-03 21:48:23 +0000 | [diff] [blame] | 613 | if (!canEmbed(face)) |
| 614 | info->fType = SkAdvancedTypefaceMetrics::kNotEmbeddable_Font; |
| 615 | |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 616 | unref_ft_face(face); |
| 617 | return info; |
reed@google.com | 8a5d692 | 2011-03-14 15:08:03 +0000 | [diff] [blame] | 618 | #endif |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 619 | } |
vandebo@chromium.org | 37ad8fb | 2011-08-18 02:38:50 +0000 | [diff] [blame] | 620 | |
reed@google.com | 618ef5e | 2011-01-26 22:10:41 +0000 | [diff] [blame] | 621 | /////////////////////////////////////////////////////////////////////////// |
| 622 | |
reed@google.com | ffe49f5 | 2011-11-22 19:42:41 +0000 | [diff] [blame] | 623 | #define BLACK_LUMINANCE_LIMIT 0x40 |
| 624 | #define WHITE_LUMINANCE_LIMIT 0xA0 |
| 625 | |
reed@google.com | 8ed436c | 2011-07-21 14:12:36 +0000 | [diff] [blame] | 626 | static bool bothZero(SkScalar a, SkScalar b) { |
| 627 | return 0 == a && 0 == b; |
| 628 | } |
| 629 | |
| 630 | // returns false if there is any non-90-rotation or skew |
| 631 | static bool isAxisAligned(const SkScalerContext::Rec& rec) { |
| 632 | return 0 == rec.fPreSkewX && |
| 633 | (bothZero(rec.fPost2x2[0][1], rec.fPost2x2[1][0]) || |
| 634 | bothZero(rec.fPost2x2[0][0], rec.fPost2x2[1][1])); |
| 635 | } |
| 636 | |
reed@google.com | 618ef5e | 2011-01-26 22:10:41 +0000 | [diff] [blame] | 637 | void SkFontHost::FilterRec(SkScalerContext::Rec* rec) { |
bungeman@google.com | 8cf3226 | 2012-04-02 14:34:30 +0000 | [diff] [blame] | 638 | //BOGUS: http://code.google.com/p/chromium/issues/detail?id=121119 |
| 639 | //Cap the requested size as larger sizes give bogus values. |
| 640 | //Remove when http://code.google.com/p/skia/issues/detail?id=554 is fixed. |
bungeman@google.com | 5582e63 | 2012-04-02 14:51:54 +0000 | [diff] [blame] | 641 | if (rec->fTextSize > SkIntToScalar(1 << 14)) { |
| 642 | rec->fTextSize = SkIntToScalar(1 << 14); |
bungeman@google.com | 8cf3226 | 2012-04-02 14:34:30 +0000 | [diff] [blame] | 643 | } |
skia.committer@gmail.com | a27096b | 2012-08-30 14:38:00 +0000 | [diff] [blame] | 644 | |
reed@google.com | 618ef5e | 2011-01-26 22:10:41 +0000 | [diff] [blame] | 645 | if (!gLCDSupportValid) { |
| 646 | InitFreetype(); |
| 647 | FT_Done_FreeType(gFTLibrary); |
| 648 | } |
reed@google.com | 5b31b0f | 2011-02-23 14:41:42 +0000 | [diff] [blame] | 649 | |
reed@google.com | effc501 | 2011-06-27 16:44:46 +0000 | [diff] [blame] | 650 | if (!gLCDSupport && isLCD(*rec)) { |
reed@google.com | 618ef5e | 2011-01-26 22:10:41 +0000 | [diff] [blame] | 651 | // If the runtime Freetype library doesn't support LCD mode, we disable |
| 652 | // it here. |
| 653 | rec->fMaskFormat = SkMask::kA8_Format; |
| 654 | } |
reed@google.com | 5b31b0f | 2011-02-23 14:41:42 +0000 | [diff] [blame] | 655 | |
reed@google.com | 618ef5e | 2011-01-26 22:10:41 +0000 | [diff] [blame] | 656 | SkPaint::Hinting h = rec->getHinting(); |
reed@google.com | effc501 | 2011-06-27 16:44:46 +0000 | [diff] [blame] | 657 | if (SkPaint::kFull_Hinting == h && !isLCD(*rec)) { |
reed@google.com | 618ef5e | 2011-01-26 22:10:41 +0000 | [diff] [blame] | 658 | // collapse full->normal hinting if we're not doing LCD |
| 659 | h = SkPaint::kNormal_Hinting; |
reed@google.com | 618ef5e | 2011-01-26 22:10:41 +0000 | [diff] [blame] | 660 | } |
bungeman@google.com | f4f2b80 | 2012-03-08 19:19:51 +0000 | [diff] [blame] | 661 | if ((rec->fFlags & SkScalerContext::kSubpixelPositioning_Flag)) { |
reed@google.com | 1ac8350 | 2012-02-28 17:06:02 +0000 | [diff] [blame] | 662 | if (SkPaint::kNo_Hinting != h) { |
| 663 | h = SkPaint::kSlight_Hinting; |
| 664 | } |
| 665 | } |
| 666 | |
vandebo@chromium.org | 37ad8fb | 2011-08-18 02:38:50 +0000 | [diff] [blame] | 667 | #ifndef SK_IGNORE_ROTATED_FREETYPE_FIX |
reed@google.com | 8ed436c | 2011-07-21 14:12:36 +0000 | [diff] [blame] | 668 | // rotated text looks bad with hinting, so we disable it as needed |
| 669 | if (!isAxisAligned(*rec)) { |
| 670 | h = SkPaint::kNo_Hinting; |
| 671 | } |
bsalomon@google.com | 0e35ca8 | 2011-07-22 17:56:19 +0000 | [diff] [blame] | 672 | #endif |
reed@google.com | 618ef5e | 2011-01-26 22:10:41 +0000 | [diff] [blame] | 673 | rec->setHinting(h); |
reed@google.com | ffe49f5 | 2011-11-22 19:42:41 +0000 | [diff] [blame] | 674 | |
bungeman@google.com | 97efada | 2012-07-30 20:40:50 +0000 | [diff] [blame] | 675 | #ifndef SK_GAMMA_APPLY_TO_A8 |
| 676 | if (!isLCD(*rec)) { |
| 677 | rec->ignorePreBlend(); |
reed@google.com | ffe49f5 | 2011-11-22 19:42:41 +0000 | [diff] [blame] | 678 | } |
reed@google.com | 1ac8350 | 2012-02-28 17:06:02 +0000 | [diff] [blame] | 679 | #endif |
reed@google.com | 618ef5e | 2011-01-26 22:10:41 +0000 | [diff] [blame] | 680 | } |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 681 | |
djsollen@google.com | da95772 | 2011-11-16 17:00:46 +0000 | [diff] [blame] | 682 | #ifdef SK_BUILD_FOR_ANDROID |
djsollen@google.com | cd9d69b | 2011-03-14 20:30:14 +0000 | [diff] [blame] | 683 | uint32_t SkFontHost::GetUnitsPerEm(SkFontID fontID) { |
| 684 | SkAutoMutexAcquire ac(gFTMutex); |
| 685 | SkFaceRec *rec = ref_ft_face(fontID); |
| 686 | uint16_t unitsPerEm = 0; |
| 687 | |
| 688 | if (rec != NULL && rec->fFace != NULL) { |
| 689 | unitsPerEm = rec->fFace->units_per_EM; |
| 690 | unref_ft_face(rec->fFace); |
| 691 | } |
| 692 | |
| 693 | return (uint32_t)unitsPerEm; |
| 694 | } |
| 695 | #endif |
| 696 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 697 | SkScalerContext_FreeType::SkScalerContext_FreeType(const SkDescriptor* desc) |
george@mozilla.com | c59b5da | 2012-08-23 00:39:08 +0000 | [diff] [blame] | 698 | : SkScalerContext_FreeType_Base(desc) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 699 | SkAutoMutexAcquire ac(gFTMutex); |
| 700 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 701 | if (gFTCount == 0) { |
reed@android.com | 659aaf9 | 2009-07-23 15:20:21 +0000 | [diff] [blame] | 702 | if (!InitFreetype()) { |
| 703 | sk_throw(); |
| 704 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 705 | } |
| 706 | ++gFTCount; |
| 707 | |
| 708 | // load the font file |
reed@android.com | 62900b4 | 2009-02-11 15:07:19 +0000 | [diff] [blame] | 709 | fFTSize = NULL; |
| 710 | fFace = NULL; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 711 | fFaceRec = ref_ft_face(fRec.fFontID); |
reed@android.com | 62900b4 | 2009-02-11 15:07:19 +0000 | [diff] [blame] | 712 | if (NULL == fFaceRec) { |
| 713 | return; |
| 714 | } |
| 715 | fFace = fFaceRec->fFace; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 716 | |
| 717 | // compute our factors from the record |
| 718 | |
| 719 | SkMatrix m; |
| 720 | |
| 721 | fRec.getSingleMatrix(&m); |
| 722 | |
| 723 | #ifdef DUMP_STRIKE_CREATION |
| 724 | SkString keyString; |
| 725 | SkFontHost::GetDescriptorKeyString(desc, &keyString); |
| 726 | printf("========== strike [%g %g %g] [%g %g %g %g] hints %d format %d %s\n", SkScalarToFloat(fRec.fTextSize), |
| 727 | SkScalarToFloat(fRec.fPreScaleX), SkScalarToFloat(fRec.fPreSkewX), |
| 728 | SkScalarToFloat(fRec.fPost2x2[0][0]), SkScalarToFloat(fRec.fPost2x2[0][1]), |
| 729 | SkScalarToFloat(fRec.fPost2x2[1][0]), SkScalarToFloat(fRec.fPost2x2[1][1]), |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame] | 730 | fRec.getHinting(), fRec.fMaskFormat, keyString.c_str()); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 731 | #endif |
| 732 | |
| 733 | // now compute our scale factors |
| 734 | SkScalar sx = m.getScaleX(); |
| 735 | SkScalar sy = m.getScaleY(); |
| 736 | |
| 737 | if (m.getSkewX() || m.getSkewY() || sx < 0 || sy < 0) { |
| 738 | // sort of give up on hinting |
| 739 | sx = SkMaxScalar(SkScalarAbs(sx), SkScalarAbs(m.getSkewX())); |
| 740 | sy = SkMaxScalar(SkScalarAbs(m.getSkewY()), SkScalarAbs(sy)); |
| 741 | sx = sy = SkScalarAve(sx, sy); |
| 742 | |
| 743 | SkScalar inv = SkScalarInvert(sx); |
| 744 | |
| 745 | // flip the skew elements to go from our Y-down system to FreeType's |
| 746 | fMatrix22.xx = SkScalarToFixed(SkScalarMul(m.getScaleX(), inv)); |
| 747 | fMatrix22.xy = -SkScalarToFixed(SkScalarMul(m.getSkewX(), inv)); |
| 748 | fMatrix22.yx = -SkScalarToFixed(SkScalarMul(m.getSkewY(), inv)); |
| 749 | fMatrix22.yy = SkScalarToFixed(SkScalarMul(m.getScaleY(), inv)); |
| 750 | } else { |
| 751 | fMatrix22.xx = fMatrix22.yy = SK_Fixed1; |
| 752 | fMatrix22.xy = fMatrix22.yx = 0; |
| 753 | } |
| 754 | |
reed@google.com | 1f1543f | 2012-09-12 21:08:33 +0000 | [diff] [blame] | 755 | #ifdef SK_SUPPORT_HINTING_SCALE_FACTOR |
reed@google.com | 9548be3 | 2012-09-14 16:00:01 +0000 | [diff] [blame] | 756 | if (fRec.getHinting() == SkPaint::kNo_Hinting) { |
| 757 | fScaleX = SkScalarToFixed(sx); |
| 758 | fScaleY = SkScalarToFixed(sy); |
| 759 | } else { |
| 760 | SkScalar hintingScaleFactor = fRec.fHintingScaleFactor; |
reed@google.com | 1f1543f | 2012-09-12 21:08:33 +0000 | [diff] [blame] | 761 | |
reed@google.com | 9548be3 | 2012-09-14 16:00:01 +0000 | [diff] [blame] | 762 | fScaleX = SkScalarToFixed(sx / hintingScaleFactor); |
| 763 | fScaleY = SkScalarToFixed(sy / hintingScaleFactor); |
reed@google.com | 1f1543f | 2012-09-12 21:08:33 +0000 | [diff] [blame] | 764 | |
reed@google.com | 9548be3 | 2012-09-14 16:00:01 +0000 | [diff] [blame] | 765 | fMatrix22.xx *= hintingScaleFactor; |
| 766 | fMatrix22.xy *= hintingScaleFactor; |
| 767 | fMatrix22.yx *= hintingScaleFactor; |
| 768 | fMatrix22.yy *= hintingScaleFactor; |
| 769 | } |
reed@google.com | 1f1543f | 2012-09-12 21:08:33 +0000 | [diff] [blame] | 770 | #else |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 771 | fScaleX = SkScalarToFixed(sx); |
| 772 | fScaleY = SkScalarToFixed(sy); |
reed@google.com | 1f1543f | 2012-09-12 21:08:33 +0000 | [diff] [blame] | 773 | #endif |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 774 | |
reed@google.com | a1bfa21 | 2012-03-08 21:57:12 +0000 | [diff] [blame] | 775 | fLCDIsVert = SkToBool(fRec.fFlags & SkScalerContext::kLCD_Vertical_Flag); |
| 776 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 777 | // compute the flags we send to Load_Glyph |
| 778 | { |
reed@android.com | e4d0bc0 | 2009-07-24 19:53:20 +0000 | [diff] [blame] | 779 | FT_Int32 loadFlags = FT_LOAD_DEFAULT; |
bungeman@google.com | 34f1026 | 2012-03-23 18:11:47 +0000 | [diff] [blame] | 780 | bool linearMetrics = SkToBool(fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 781 | |
agl@chromium.org | 70a303f | 2010-05-10 14:15:50 +0000 | [diff] [blame] | 782 | if (SkMask::kBW_Format == fRec.fMaskFormat) { |
| 783 | // See http://code.google.com/p/chromium/issues/detail?id=43252#c24 |
| 784 | loadFlags = FT_LOAD_TARGET_MONO; |
reed@google.com | effc501 | 2011-06-27 16:44:46 +0000 | [diff] [blame] | 785 | if (fRec.getHinting() == SkPaint::kNo_Hinting) { |
agl@chromium.org | 70a303f | 2010-05-10 14:15:50 +0000 | [diff] [blame] | 786 | loadFlags = FT_LOAD_NO_HINTING; |
reed@google.com | bdc9988 | 2011-11-21 14:36:57 +0000 | [diff] [blame] | 787 | linearMetrics = true; |
reed@google.com | effc501 | 2011-06-27 16:44:46 +0000 | [diff] [blame] | 788 | } |
agl@chromium.org | 70a303f | 2010-05-10 14:15:50 +0000 | [diff] [blame] | 789 | } else { |
| 790 | switch (fRec.getHinting()) { |
| 791 | case SkPaint::kNo_Hinting: |
| 792 | loadFlags = FT_LOAD_NO_HINTING; |
reed@google.com | bdc9988 | 2011-11-21 14:36:57 +0000 | [diff] [blame] | 793 | linearMetrics = true; |
agl@chromium.org | 70a303f | 2010-05-10 14:15:50 +0000 | [diff] [blame] | 794 | break; |
| 795 | case SkPaint::kSlight_Hinting: |
| 796 | loadFlags = FT_LOAD_TARGET_LIGHT; // This implies FORCE_AUTOHINT |
| 797 | break; |
| 798 | case SkPaint::kNormal_Hinting: |
agl@chromium.org | a2c71cb | 2010-06-17 20:49:17 +0000 | [diff] [blame] | 799 | if (fRec.fFlags & SkScalerContext::kAutohinting_Flag) |
| 800 | loadFlags = FT_LOAD_FORCE_AUTOHINT; |
| 801 | else |
| 802 | loadFlags = FT_LOAD_NO_AUTOHINT; |
agl@chromium.org | 70a303f | 2010-05-10 14:15:50 +0000 | [diff] [blame] | 803 | break; |
| 804 | case SkPaint::kFull_Hinting: |
agl@chromium.org | a2c71cb | 2010-06-17 20:49:17 +0000 | [diff] [blame] | 805 | if (fRec.fFlags & SkScalerContext::kAutohinting_Flag) { |
| 806 | loadFlags = FT_LOAD_FORCE_AUTOHINT; |
| 807 | break; |
| 808 | } |
agl@chromium.org | 70a303f | 2010-05-10 14:15:50 +0000 | [diff] [blame] | 809 | loadFlags = FT_LOAD_TARGET_NORMAL; |
reed@google.com | effc501 | 2011-06-27 16:44:46 +0000 | [diff] [blame] | 810 | if (isLCD(fRec)) { |
reed@google.com | a1bfa21 | 2012-03-08 21:57:12 +0000 | [diff] [blame] | 811 | if (fLCDIsVert) { |
reed@google.com | effc501 | 2011-06-27 16:44:46 +0000 | [diff] [blame] | 812 | loadFlags = FT_LOAD_TARGET_LCD_V; |
| 813 | } else { |
| 814 | loadFlags = FT_LOAD_TARGET_LCD; |
| 815 | } |
reed@google.com | ea2333d | 2011-03-14 16:44:56 +0000 | [diff] [blame] | 816 | } |
agl@chromium.org | 70a303f | 2010-05-10 14:15:50 +0000 | [diff] [blame] | 817 | break; |
| 818 | default: |
| 819 | SkDebugf("---------- UNKNOWN hinting %d\n", fRec.getHinting()); |
| 820 | break; |
| 821 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 822 | } |
| 823 | |
reed@google.com | effc501 | 2011-06-27 16:44:46 +0000 | [diff] [blame] | 824 | if ((fRec.fFlags & SkScalerContext::kEmbeddedBitmapText_Flag) == 0) { |
agl@chromium.org | e0d0899 | 2009-08-07 19:19:23 +0000 | [diff] [blame] | 825 | loadFlags |= FT_LOAD_NO_BITMAP; |
reed@google.com | effc501 | 2011-06-27 16:44:46 +0000 | [diff] [blame] | 826 | } |
agl@chromium.org | e0d0899 | 2009-08-07 19:19:23 +0000 | [diff] [blame] | 827 | |
reed@google.com | 96a9f791 | 2011-05-06 11:49:30 +0000 | [diff] [blame] | 828 | // Always using FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH to get correct |
| 829 | // advances, as fontconfig and cairo do. |
| 830 | // See http://code.google.com/p/skia/issues/detail?id=222. |
| 831 | loadFlags |= FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH; |
| 832 | |
bungeman@google.com | 8ff8a19 | 2012-09-25 20:38:28 +0000 | [diff] [blame^] | 833 | // Use vertical layout if requested. |
| 834 | if (fRec.fFlags & SkScalerContext::kVertical_Flag) { |
| 835 | loadFlags |= FT_LOAD_VERTICAL_LAYOUT; |
| 836 | } |
| 837 | |
reed@android.com | e4d0bc0 | 2009-07-24 19:53:20 +0000 | [diff] [blame] | 838 | fLoadGlyphFlags = loadFlags; |
reed@google.com | bdc9988 | 2011-11-21 14:36:57 +0000 | [diff] [blame] | 839 | fDoLinearMetrics = linearMetrics; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 840 | } |
| 841 | |
| 842 | // now create the FT_Size |
| 843 | |
| 844 | { |
| 845 | FT_Error err; |
| 846 | |
| 847 | err = FT_New_Size(fFace, &fFTSize); |
| 848 | if (err != 0) { |
| 849 | SkDEBUGF(("SkScalerContext_FreeType::FT_New_Size(%x): FT_Set_Char_Size(0x%x, 0x%x) returned 0x%x\n", |
| 850 | fFaceRec->fFontID, fScaleX, fScaleY, err)); |
| 851 | fFace = NULL; |
| 852 | return; |
| 853 | } |
| 854 | |
| 855 | err = FT_Activate_Size(fFTSize); |
| 856 | if (err != 0) { |
| 857 | SkDEBUGF(("SkScalerContext_FreeType::FT_Activate_Size(%x, 0x%x, 0x%x) returned 0x%x\n", |
| 858 | fFaceRec->fFontID, fScaleX, fScaleY, err)); |
| 859 | fFTSize = NULL; |
| 860 | } |
| 861 | |
| 862 | err = FT_Set_Char_Size( fFace, |
| 863 | SkFixedToFDot6(fScaleX), SkFixedToFDot6(fScaleY), |
| 864 | 72, 72); |
| 865 | if (err != 0) { |
| 866 | SkDEBUGF(("SkScalerContext_FreeType::FT_Set_Char_Size(%x, 0x%x, 0x%x) returned 0x%x\n", |
| 867 | fFaceRec->fFontID, fScaleX, fScaleY, err)); |
| 868 | fFace = NULL; |
| 869 | return; |
| 870 | } |
| 871 | |
| 872 | FT_Set_Transform( fFace, &fMatrix22, NULL); |
| 873 | } |
| 874 | } |
| 875 | |
| 876 | SkScalerContext_FreeType::~SkScalerContext_FreeType() { |
| 877 | if (fFTSize != NULL) { |
| 878 | FT_Done_Size(fFTSize); |
| 879 | } |
| 880 | |
| 881 | SkAutoMutexAcquire ac(gFTMutex); |
| 882 | |
| 883 | if (fFace != NULL) { |
| 884 | unref_ft_face(fFace); |
| 885 | } |
| 886 | if (--gFTCount == 0) { |
| 887 | // SkDEBUGF(("FT_Done_FreeType\n")); |
| 888 | FT_Done_FreeType(gFTLibrary); |
| 889 | SkDEBUGCODE(gFTLibrary = NULL;) |
| 890 | } |
| 891 | } |
| 892 | |
| 893 | /* We call this before each use of the fFace, since we may be sharing |
| 894 | this face with other context (at different sizes). |
| 895 | */ |
| 896 | FT_Error SkScalerContext_FreeType::setupSize() { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 897 | FT_Error err = FT_Activate_Size(fFTSize); |
| 898 | |
| 899 | if (err != 0) { |
| 900 | SkDEBUGF(("SkScalerContext_FreeType::FT_Activate_Size(%x, 0x%x, 0x%x) returned 0x%x\n", |
| 901 | fFaceRec->fFontID, fScaleX, fScaleY, err)); |
| 902 | fFTSize = NULL; |
| 903 | } else { |
| 904 | // seems we need to reset this every time (not sure why, but without it |
| 905 | // I get random italics from some other fFTSize) |
| 906 | FT_Set_Transform( fFace, &fMatrix22, NULL); |
| 907 | } |
| 908 | return err; |
| 909 | } |
| 910 | |
ctguil@chromium.org | 0bc7bf5 | 2011-03-04 19:04:57 +0000 | [diff] [blame] | 911 | unsigned SkScalerContext_FreeType::generateGlyphCount() { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 912 | return fFace->num_glyphs; |
| 913 | } |
| 914 | |
| 915 | uint16_t SkScalerContext_FreeType::generateCharToGlyph(SkUnichar uni) { |
| 916 | return SkToU16(FT_Get_Char_Index( fFace, uni )); |
| 917 | } |
| 918 | |
reed@android.com | 9d3a985 | 2010-01-08 14:07:42 +0000 | [diff] [blame] | 919 | SkUnichar SkScalerContext_FreeType::generateGlyphToChar(uint16_t glyph) { |
| 920 | // iterate through each cmap entry, looking for matching glyph indices |
| 921 | FT_UInt glyphIndex; |
| 922 | SkUnichar charCode = FT_Get_First_Char( fFace, &glyphIndex ); |
| 923 | |
| 924 | while (glyphIndex != 0) { |
| 925 | if (glyphIndex == glyph) { |
| 926 | return charCode; |
| 927 | } |
| 928 | charCode = FT_Get_Next_Char( fFace, charCode, &glyphIndex ); |
| 929 | } |
| 930 | |
| 931 | return 0; |
| 932 | } |
| 933 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 934 | void SkScalerContext_FreeType::generateAdvance(SkGlyph* glyph) { |
| 935 | #ifdef FT_ADVANCES_H |
| 936 | /* unhinted and light hinted text have linearly scaled advances |
| 937 | * which are very cheap to compute with some font formats... |
| 938 | */ |
reed@google.com | bdc9988 | 2011-11-21 14:36:57 +0000 | [diff] [blame] | 939 | if (fDoLinearMetrics) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 940 | SkAutoMutexAcquire ac(gFTMutex); |
| 941 | |
| 942 | if (this->setupSize()) { |
reed@android.com | 62900b4 | 2009-02-11 15:07:19 +0000 | [diff] [blame] | 943 | glyph->zeroMetrics(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 944 | return; |
| 945 | } |
| 946 | |
| 947 | FT_Error error; |
| 948 | FT_Fixed advance; |
| 949 | |
| 950 | error = FT_Get_Advance( fFace, glyph->getGlyphID(fBaseGlyphCount), |
| 951 | fLoadGlyphFlags | FT_ADVANCE_FLAG_FAST_ONLY, |
| 952 | &advance ); |
| 953 | if (0 == error) { |
| 954 | glyph->fRsbDelta = 0; |
| 955 | glyph->fLsbDelta = 0; |
reed@google.com | d074c37 | 2012-07-18 13:45:58 +0000 | [diff] [blame] | 956 | glyph->fAdvanceX = SkFixedMul(fMatrix22.xx, advance); |
| 957 | glyph->fAdvanceY = - SkFixedMul(fMatrix22.yx, advance); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 958 | return; |
| 959 | } |
| 960 | } |
| 961 | #endif /* FT_ADVANCES_H */ |
| 962 | /* otherwise, we need to load/hint the glyph, which is slower */ |
| 963 | this->generateMetrics(glyph); |
| 964 | return; |
| 965 | } |
| 966 | |
djsollen@google.com | d8b599c | 2012-03-19 19:44:19 +0000 | [diff] [blame] | 967 | void SkScalerContext_FreeType::getBBoxForCurrentGlyph(SkGlyph* glyph, |
| 968 | FT_BBox* bbox, |
| 969 | bool snapToPixelBoundary) { |
| 970 | |
| 971 | FT_Outline_Get_CBox(&fFace->glyph->outline, bbox); |
| 972 | |
| 973 | if (fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag) { |
george@mozilla.com | c59b5da | 2012-08-23 00:39:08 +0000 | [diff] [blame] | 974 | int dx = SkFixedToFDot6(glyph->getSubXFixed()); |
| 975 | int dy = SkFixedToFDot6(glyph->getSubYFixed()); |
djsollen@google.com | d8b599c | 2012-03-19 19:44:19 +0000 | [diff] [blame] | 976 | // negate dy since freetype-y-goes-up and skia-y-goes-down |
| 977 | bbox->xMin += dx; |
| 978 | bbox->yMin -= dy; |
| 979 | bbox->xMax += dx; |
| 980 | bbox->yMax -= dy; |
| 981 | } |
| 982 | |
| 983 | // outset the box to integral boundaries |
| 984 | if (snapToPixelBoundary) { |
| 985 | bbox->xMin &= ~63; |
| 986 | bbox->yMin &= ~63; |
| 987 | bbox->xMax = (bbox->xMax + 63) & ~63; |
| 988 | bbox->yMax = (bbox->yMax + 63) & ~63; |
| 989 | } |
bungeman@google.com | 8ff8a19 | 2012-09-25 20:38:28 +0000 | [diff] [blame^] | 990 | |
| 991 | // Must come after snapToPixelBoundary so that the width and height are |
| 992 | // consistent. Otherwise asserts will fire later on when generating the |
| 993 | // glyph image. |
| 994 | if (fRec.fFlags & SkScalerContext::kVertical_Flag) { |
| 995 | FT_Vector vector; |
| 996 | vector.x = fFace->glyph->metrics.vertBearingX - fFace->glyph->metrics.horiBearingX; |
| 997 | vector.y = -fFace->glyph->metrics.vertBearingY - fFace->glyph->metrics.horiBearingY; |
| 998 | FT_Vector_Transform(&vector, &fMatrix22); |
| 999 | bbox->xMin += vector.x; |
| 1000 | bbox->xMax += vector.x; |
| 1001 | bbox->yMin += vector.y; |
| 1002 | bbox->yMax += vector.y; |
| 1003 | } |
djsollen@google.com | d8b599c | 2012-03-19 19:44:19 +0000 | [diff] [blame] | 1004 | } |
| 1005 | |
| 1006 | void SkScalerContext_FreeType::updateGlyphIfLCD(SkGlyph* glyph) { |
| 1007 | if (isLCD(fRec)) { |
| 1008 | if (fLCDIsVert) { |
| 1009 | glyph->fHeight += gLCDExtra; |
| 1010 | glyph->fTop -= gLCDExtra >> 1; |
| 1011 | } else { |
| 1012 | glyph->fWidth += gLCDExtra; |
| 1013 | glyph->fLeft -= gLCDExtra >> 1; |
| 1014 | } |
| 1015 | } |
| 1016 | } |
bungeman@google.com | 875eb98 | 2012-04-12 15:53:23 +0000 | [diff] [blame] | 1017 | void SkScalerContext_FreeType::updateGlyphPosIfLCD(SkGlyph* glyph) { |
| 1018 | if (isLCD(fRec)) { |
| 1019 | if (fLCDIsVert) { |
| 1020 | glyph->fTop -= gLCDExtra >> 1; |
| 1021 | } else { |
| 1022 | glyph->fLeft -= gLCDExtra >> 1; |
| 1023 | } |
| 1024 | } |
| 1025 | } |
djsollen@google.com | d8b599c | 2012-03-19 19:44:19 +0000 | [diff] [blame] | 1026 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1027 | void SkScalerContext_FreeType::generateMetrics(SkGlyph* glyph) { |
| 1028 | SkAutoMutexAcquire ac(gFTMutex); |
| 1029 | |
| 1030 | glyph->fRsbDelta = 0; |
| 1031 | glyph->fLsbDelta = 0; |
| 1032 | |
| 1033 | FT_Error err; |
| 1034 | |
| 1035 | if (this->setupSize()) { |
| 1036 | goto ERROR; |
| 1037 | } |
| 1038 | |
| 1039 | err = FT_Load_Glyph( fFace, glyph->getGlyphID(fBaseGlyphCount), fLoadGlyphFlags ); |
| 1040 | if (err != 0) { |
| 1041 | SkDEBUGF(("SkScalerContext_FreeType::generateMetrics(%x): FT_Load_Glyph(glyph:%d flags:%d) returned 0x%x\n", |
| 1042 | fFaceRec->fFontID, glyph->getGlyphID(fBaseGlyphCount), fLoadGlyphFlags, err)); |
| 1043 | ERROR: |
reed@android.com | 62900b4 | 2009-02-11 15:07:19 +0000 | [diff] [blame] | 1044 | glyph->zeroMetrics(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1045 | return; |
| 1046 | } |
| 1047 | |
| 1048 | switch ( fFace->glyph->format ) { |
thakis@chromium.org | 598b859 | 2011-05-24 05:42:55 +0000 | [diff] [blame] | 1049 | case FT_GLYPH_FORMAT_OUTLINE: { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1050 | FT_BBox bbox; |
| 1051 | |
bungeman@google.com | 0f0c288 | 2011-11-04 15:47:41 +0000 | [diff] [blame] | 1052 | if (0 == fFace->glyph->outline.n_contours) { |
| 1053 | glyph->fWidth = 0; |
| 1054 | glyph->fHeight = 0; |
| 1055 | glyph->fTop = 0; |
| 1056 | glyph->fLeft = 0; |
| 1057 | break; |
| 1058 | } |
| 1059 | |
senorblanco@chromium.org | 4526a84 | 2010-02-05 23:08:20 +0000 | [diff] [blame] | 1060 | if (fRec.fFlags & kEmbolden_Flag) { |
george@mozilla.com | c59b5da | 2012-08-23 00:39:08 +0000 | [diff] [blame] | 1061 | emboldenOutline(fFace, &fFace->glyph->outline); |
senorblanco@chromium.org | 4526a84 | 2010-02-05 23:08:20 +0000 | [diff] [blame] | 1062 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1063 | |
djsollen@google.com | d8b599c | 2012-03-19 19:44:19 +0000 | [diff] [blame] | 1064 | getBBoxForCurrentGlyph(glyph, &bbox, true); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1065 | |
bungeman@google.com | 8ff8a19 | 2012-09-25 20:38:28 +0000 | [diff] [blame^] | 1066 | glyph->fWidth = SkToU16(SkFDot6Floor(bbox.xMax - bbox.xMin)); |
| 1067 | glyph->fHeight = SkToU16(SkFDot6Floor(bbox.yMax - bbox.yMin)); |
| 1068 | glyph->fTop = -SkToS16(SkFDot6Floor(bbox.yMax)); |
| 1069 | glyph->fLeft = SkToS16(SkFDot6Floor(bbox.xMin)); |
djsollen@google.com | d8b599c | 2012-03-19 19:44:19 +0000 | [diff] [blame] | 1070 | |
| 1071 | updateGlyphIfLCD(glyph); |
| 1072 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1073 | break; |
thakis@chromium.org | 598b859 | 2011-05-24 05:42:55 +0000 | [diff] [blame] | 1074 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1075 | |
| 1076 | case FT_GLYPH_FORMAT_BITMAP: |
agl@chromium.org | e76073b | 2010-06-04 20:31:17 +0000 | [diff] [blame] | 1077 | if (fRec.fFlags & kEmbolden_Flag) { |
| 1078 | FT_GlyphSlot_Own_Bitmap(fFace->glyph); |
| 1079 | FT_Bitmap_Embolden(gFTLibrary, &fFace->glyph->bitmap, kBitmapEmboldenStrength, 0); |
| 1080 | } |
bungeman@google.com | 8ff8a19 | 2012-09-25 20:38:28 +0000 | [diff] [blame^] | 1081 | |
| 1082 | if (fRec.fFlags & SkScalerContext::kVertical_Flag) { |
| 1083 | FT_Vector vector; |
| 1084 | vector.x = fFace->glyph->metrics.vertBearingX - fFace->glyph->metrics.horiBearingX; |
| 1085 | vector.y = -fFace->glyph->metrics.vertBearingY - fFace->glyph->metrics.horiBearingY; |
| 1086 | FT_Vector_Transform(&vector, &fMatrix22); |
| 1087 | fFace->glyph->bitmap_left += SkFDot6Floor(vector.x); |
| 1088 | fFace->glyph->bitmap_top += SkFDot6Floor(vector.y); |
| 1089 | } |
| 1090 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1091 | glyph->fWidth = SkToU16(fFace->glyph->bitmap.width); |
| 1092 | glyph->fHeight = SkToU16(fFace->glyph->bitmap.rows); |
| 1093 | glyph->fTop = -SkToS16(fFace->glyph->bitmap_top); |
| 1094 | glyph->fLeft = SkToS16(fFace->glyph->bitmap_left); |
| 1095 | break; |
| 1096 | |
| 1097 | default: |
tomhudson@google.com | 0c00f21 | 2011-12-28 14:59:50 +0000 | [diff] [blame] | 1098 | SkDEBUGFAIL("unknown glyph format"); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1099 | goto ERROR; |
| 1100 | } |
| 1101 | |
bungeman@google.com | 8ff8a19 | 2012-09-25 20:38:28 +0000 | [diff] [blame^] | 1102 | if (fRec.fFlags & SkScalerContext::kVertical_Flag) { |
| 1103 | if (fDoLinearMetrics) { |
| 1104 | glyph->fAdvanceX = -SkFixedMul(fMatrix22.xy, fFace->glyph->linearVertAdvance); |
| 1105 | glyph->fAdvanceY = SkFixedMul(fMatrix22.yy, fFace->glyph->linearVertAdvance); |
| 1106 | } else { |
| 1107 | glyph->fAdvanceX = -SkFDot6ToFixed(fFace->glyph->advance.x); |
| 1108 | glyph->fAdvanceY = SkFDot6ToFixed(fFace->glyph->advance.y); |
| 1109 | } |
bungeman@google.com | 34f1026 | 2012-03-23 18:11:47 +0000 | [diff] [blame] | 1110 | } else { |
bungeman@google.com | 8ff8a19 | 2012-09-25 20:38:28 +0000 | [diff] [blame^] | 1111 | if (fDoLinearMetrics) { |
| 1112 | glyph->fAdvanceX = SkFixedMul(fMatrix22.xx, fFace->glyph->linearHoriAdvance); |
| 1113 | glyph->fAdvanceY = -SkFixedMul(fMatrix22.yx, fFace->glyph->linearHoriAdvance); |
| 1114 | } else { |
| 1115 | glyph->fAdvanceX = SkFDot6ToFixed(fFace->glyph->advance.x); |
| 1116 | glyph->fAdvanceY = -SkFDot6ToFixed(fFace->glyph->advance.y); |
bungeman@google.com | 34f1026 | 2012-03-23 18:11:47 +0000 | [diff] [blame] | 1117 | |
bungeman@google.com | 8ff8a19 | 2012-09-25 20:38:28 +0000 | [diff] [blame^] | 1118 | if (fRec.fFlags & kDevKernText_Flag) { |
| 1119 | glyph->fRsbDelta = SkToS8(fFace->glyph->rsb_delta); |
| 1120 | glyph->fLsbDelta = SkToS8(fFace->glyph->lsb_delta); |
djsollen@google.com | d8b599c | 2012-03-19 19:44:19 +0000 | [diff] [blame] | 1121 | } |
| 1122 | } |
djsollen@google.com | d8b599c | 2012-03-19 19:44:19 +0000 | [diff] [blame] | 1123 | } |
| 1124 | |
| 1125 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1126 | #ifdef ENABLE_GLYPH_SPEW |
| 1127 | SkDEBUGF(("FT_Set_Char_Size(this:%p sx:%x sy:%x ", this, fScaleX, fScaleY)); |
| 1128 | SkDEBUGF(("Metrics(glyph:%d flags:0x%x) w:%d\n", glyph->getGlyphID(fBaseGlyphCount), fLoadGlyphFlags, glyph->fWidth)); |
| 1129 | #endif |
| 1130 | } |
| 1131 | |
reed@google.com | ea2333d | 2011-03-14 16:44:56 +0000 | [diff] [blame] | 1132 | |
bungeman@google.com | 97efada | 2012-07-30 20:40:50 +0000 | [diff] [blame] | 1133 | void SkScalerContext_FreeType::generateImage(const SkGlyph& glyph, SkMaskGamma::PreBlend* maskPreBlend) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1134 | SkAutoMutexAcquire ac(gFTMutex); |
| 1135 | |
| 1136 | FT_Error err; |
| 1137 | |
| 1138 | if (this->setupSize()) { |
| 1139 | goto ERROR; |
| 1140 | } |
| 1141 | |
| 1142 | err = FT_Load_Glyph( fFace, glyph.getGlyphID(fBaseGlyphCount), fLoadGlyphFlags); |
| 1143 | if (err != 0) { |
| 1144 | SkDEBUGF(("SkScalerContext_FreeType::generateImage: FT_Load_Glyph(glyph:%d width:%d height:%d rb:%d flags:%d) returned 0x%x\n", |
| 1145 | glyph.getGlyphID(fBaseGlyphCount), glyph.fWidth, glyph.fHeight, glyph.rowBytes(), fLoadGlyphFlags, err)); |
| 1146 | ERROR: |
| 1147 | memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight); |
| 1148 | return; |
| 1149 | } |
| 1150 | |
george@mozilla.com | c59b5da | 2012-08-23 00:39:08 +0000 | [diff] [blame] | 1151 | generateGlyphImage(fFace, glyph, maskPreBlend); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1152 | } |
| 1153 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1154 | |
| 1155 | void SkScalerContext_FreeType::generatePath(const SkGlyph& glyph, |
| 1156 | SkPath* path) { |
| 1157 | SkAutoMutexAcquire ac(gFTMutex); |
| 1158 | |
| 1159 | SkASSERT(&glyph && path); |
| 1160 | |
| 1161 | if (this->setupSize()) { |
| 1162 | path->reset(); |
| 1163 | return; |
| 1164 | } |
| 1165 | |
| 1166 | uint32_t flags = fLoadGlyphFlags; |
| 1167 | flags |= FT_LOAD_NO_BITMAP; // ignore embedded bitmaps so we're sure to get the outline |
| 1168 | flags &= ~FT_LOAD_RENDER; // don't scan convert (we just want the outline) |
| 1169 | |
| 1170 | FT_Error err = FT_Load_Glyph( fFace, glyph.getGlyphID(fBaseGlyphCount), flags); |
| 1171 | |
| 1172 | if (err != 0) { |
| 1173 | SkDEBUGF(("SkScalerContext_FreeType::generatePath: FT_Load_Glyph(glyph:%d flags:%d) returned 0x%x\n", |
| 1174 | glyph.getGlyphID(fBaseGlyphCount), flags, err)); |
| 1175 | path->reset(); |
| 1176 | return; |
| 1177 | } |
| 1178 | |
george@mozilla.com | c59b5da | 2012-08-23 00:39:08 +0000 | [diff] [blame] | 1179 | generateGlyphPath(fFace, glyph, path); |
bungeman@google.com | 8ff8a19 | 2012-09-25 20:38:28 +0000 | [diff] [blame^] | 1180 | |
| 1181 | // The path's origin from FreeType is always the horizontal layout origin. |
| 1182 | // Offset the path so that it is relative to the vertical origin if needed. |
| 1183 | if (fRec.fFlags & SkScalerContext::kVertical_Flag) { |
| 1184 | FT_Vector vector; |
| 1185 | vector.x = fFace->glyph->metrics.vertBearingX - fFace->glyph->metrics.horiBearingX; |
| 1186 | vector.y = -fFace->glyph->metrics.vertBearingY - fFace->glyph->metrics.horiBearingY; |
| 1187 | FT_Vector_Transform(&vector, &fMatrix22); |
| 1188 | path->offset(SkFDot6ToScalar(vector.x), -SkFDot6ToScalar(vector.y)); |
| 1189 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1190 | } |
| 1191 | |
| 1192 | void SkScalerContext_FreeType::generateFontMetrics(SkPaint::FontMetrics* mx, |
| 1193 | SkPaint::FontMetrics* my) { |
| 1194 | if (NULL == mx && NULL == my) { |
| 1195 | return; |
| 1196 | } |
| 1197 | |
| 1198 | SkAutoMutexAcquire ac(gFTMutex); |
| 1199 | |
| 1200 | if (this->setupSize()) { |
reed@android.com | a8a8b8b | 2009-05-04 15:00:11 +0000 | [diff] [blame] | 1201 | ERROR: |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1202 | if (mx) { |
reed@android.com | 4516f47 | 2009-06-29 16:25:36 +0000 | [diff] [blame] | 1203 | sk_bzero(mx, sizeof(SkPaint::FontMetrics)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1204 | } |
| 1205 | if (my) { |
reed@android.com | 4516f47 | 2009-06-29 16:25:36 +0000 | [diff] [blame] | 1206 | sk_bzero(my, sizeof(SkPaint::FontMetrics)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1207 | } |
| 1208 | return; |
| 1209 | } |
| 1210 | |
reed@android.com | a8a8b8b | 2009-05-04 15:00:11 +0000 | [diff] [blame] | 1211 | FT_Face face = fFace; |
| 1212 | int upem = face->units_per_EM; |
| 1213 | if (upem <= 0) { |
| 1214 | goto ERROR; |
| 1215 | } |
| 1216 | |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 1217 | SkPoint pts[6]; |
| 1218 | SkFixed ys[6]; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1219 | SkFixed scaleY = fScaleY; |
| 1220 | SkFixed mxy = fMatrix22.xy; |
| 1221 | SkFixed myy = fMatrix22.yy; |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 1222 | SkScalar xmin = SkIntToScalar(face->bbox.xMin) / upem; |
| 1223 | SkScalar xmax = SkIntToScalar(face->bbox.xMax) / upem; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1224 | |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 1225 | int leading = face->height - (face->ascender + -face->descender); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1226 | if (leading < 0) { |
| 1227 | leading = 0; |
| 1228 | } |
| 1229 | |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 1230 | // Try to get the OS/2 table from the font. This contains the specific |
| 1231 | // average font width metrics which Windows uses. |
| 1232 | TT_OS2* os2 = (TT_OS2*) FT_Get_Sfnt_Table(face, ft_sfnt_os2); |
| 1233 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1234 | ys[0] = -face->bbox.yMax; |
| 1235 | ys[1] = -face->ascender; |
| 1236 | ys[2] = -face->descender; |
| 1237 | ys[3] = -face->bbox.yMin; |
| 1238 | ys[4] = leading; |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 1239 | ys[5] = os2 ? os2->xAvgCharWidth : 0; |
| 1240 | |
| 1241 | SkScalar x_height; |
| 1242 | if (os2 && os2->sxHeight) { |
| 1243 | x_height = SkFixedToScalar(SkMulDiv(fScaleX, os2->sxHeight, upem)); |
| 1244 | } else { |
| 1245 | const FT_UInt x_glyph = FT_Get_Char_Index(fFace, 'x'); |
| 1246 | if (x_glyph) { |
| 1247 | FT_BBox bbox; |
| 1248 | FT_Load_Glyph(fFace, x_glyph, fLoadGlyphFlags); |
senorblanco@chromium.org | 4526a84 | 2010-02-05 23:08:20 +0000 | [diff] [blame] | 1249 | if (fRec.fFlags & kEmbolden_Flag) { |
george@mozilla.com | c59b5da | 2012-08-23 00:39:08 +0000 | [diff] [blame] | 1250 | emboldenOutline(fFace, &fFace->glyph->outline); |
senorblanco@chromium.org | 4526a84 | 2010-02-05 23:08:20 +0000 | [diff] [blame] | 1251 | } |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 1252 | FT_Outline_Get_CBox(&fFace->glyph->outline, &bbox); |
epoger@google.com | b90113d | 2012-01-18 19:20:39 +0000 | [diff] [blame] | 1253 | x_height = SkFixedToScalar(SkFDot6ToFixed(bbox.yMax)); |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 1254 | } else { |
| 1255 | x_height = 0; |
| 1256 | } |
| 1257 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1258 | |
| 1259 | // convert upem-y values into scalar points |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 1260 | for (int i = 0; i < 6; i++) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1261 | SkFixed y = SkMulDiv(scaleY, ys[i], upem); |
| 1262 | SkFixed x = SkFixedMul(mxy, y); |
| 1263 | y = SkFixedMul(myy, y); |
| 1264 | pts[i].set(SkFixedToScalar(x), SkFixedToScalar(y)); |
| 1265 | } |
| 1266 | |
| 1267 | if (mx) { |
| 1268 | mx->fTop = pts[0].fX; |
| 1269 | mx->fAscent = pts[1].fX; |
| 1270 | mx->fDescent = pts[2].fX; |
| 1271 | mx->fBottom = pts[3].fX; |
| 1272 | mx->fLeading = pts[4].fX; |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 1273 | mx->fAvgCharWidth = pts[5].fX; |
| 1274 | mx->fXMin = xmin; |
| 1275 | mx->fXMax = xmax; |
| 1276 | mx->fXHeight = x_height; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1277 | } |
| 1278 | if (my) { |
| 1279 | my->fTop = pts[0].fY; |
| 1280 | my->fAscent = pts[1].fY; |
| 1281 | my->fDescent = pts[2].fY; |
| 1282 | my->fBottom = pts[3].fY; |
| 1283 | my->fLeading = pts[4].fY; |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 1284 | my->fAvgCharWidth = pts[5].fY; |
| 1285 | my->fXMin = xmin; |
| 1286 | my->fXMax = xmax; |
| 1287 | my->fXHeight = x_height; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1288 | } |
| 1289 | } |
| 1290 | |
| 1291 | //////////////////////////////////////////////////////////////////////// |
| 1292 | //////////////////////////////////////////////////////////////////////// |
| 1293 | |
| 1294 | SkScalerContext* SkFontHost::CreateScalerContext(const SkDescriptor* desc) { |
reed@android.com | 62900b4 | 2009-02-11 15:07:19 +0000 | [diff] [blame] | 1295 | SkScalerContext_FreeType* c = SkNEW_ARGS(SkScalerContext_FreeType, (desc)); |
| 1296 | if (!c->success()) { |
| 1297 | SkDELETE(c); |
| 1298 | c = NULL; |
| 1299 | } |
| 1300 | return c; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1301 | } |
| 1302 | |
| 1303 | /////////////////////////////////////////////////////////////////////////////// |
| 1304 | |
| 1305 | /* Export this so that other parts of our FonttHost port can make use of our |
| 1306 | ability to extract the name+style from a stream, using FreeType's api. |
| 1307 | */ |
djsollen@google.com | 4dc686d | 2012-02-15 21:03:45 +0000 | [diff] [blame] | 1308 | bool find_name_and_attributes(SkStream* stream, SkString* name, |
| 1309 | SkTypeface::Style* style, bool* isFixedWidth) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1310 | FT_Library library; |
reed@android.com | bfbd4ff | 2009-07-23 17:44:41 +0000 | [diff] [blame] | 1311 | if (FT_Init_FreeType(&library)) { |
djsollen@google.com | 4dc686d | 2012-02-15 21:03:45 +0000 | [diff] [blame] | 1312 | return false; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1313 | } |
| 1314 | |
| 1315 | FT_Open_Args args; |
| 1316 | memset(&args, 0, sizeof(args)); |
| 1317 | |
| 1318 | const void* memoryBase = stream->getMemoryBase(); |
| 1319 | FT_StreamRec streamRec; |
| 1320 | |
| 1321 | if (NULL != memoryBase) { |
| 1322 | args.flags = FT_OPEN_MEMORY; |
| 1323 | args.memory_base = (const FT_Byte*)memoryBase; |
| 1324 | args.memory_size = stream->getLength(); |
| 1325 | } else { |
| 1326 | memset(&streamRec, 0, sizeof(streamRec)); |
| 1327 | streamRec.size = stream->read(NULL, 0); |
| 1328 | streamRec.descriptor.pointer = stream; |
| 1329 | streamRec.read = sk_stream_read; |
| 1330 | streamRec.close = sk_stream_close; |
| 1331 | |
| 1332 | args.flags = FT_OPEN_STREAM; |
| 1333 | args.stream = &streamRec; |
| 1334 | } |
| 1335 | |
| 1336 | FT_Face face; |
| 1337 | if (FT_Open_Face(library, &args, 0, &face)) { |
| 1338 | FT_Done_FreeType(library); |
djsollen@google.com | 4dc686d | 2012-02-15 21:03:45 +0000 | [diff] [blame] | 1339 | return false; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1340 | } |
| 1341 | |
djsollen@google.com | 4dc686d | 2012-02-15 21:03:45 +0000 | [diff] [blame] | 1342 | int tempStyle = SkTypeface::kNormal; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1343 | if (face->style_flags & FT_STYLE_FLAG_BOLD) { |
djsollen@google.com | 4dc686d | 2012-02-15 21:03:45 +0000 | [diff] [blame] | 1344 | tempStyle |= SkTypeface::kBold; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1345 | } |
| 1346 | if (face->style_flags & FT_STYLE_FLAG_ITALIC) { |
djsollen@google.com | 4dc686d | 2012-02-15 21:03:45 +0000 | [diff] [blame] | 1347 | tempStyle |= SkTypeface::kItalic; |
| 1348 | } |
| 1349 | |
| 1350 | if (name) { |
| 1351 | name->set(face->family_name); |
| 1352 | } |
| 1353 | if (style) { |
| 1354 | *style = (SkTypeface::Style) tempStyle; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1355 | } |
reed@google.com | 5b31b0f | 2011-02-23 14:41:42 +0000 | [diff] [blame] | 1356 | if (isFixedWidth) { |
| 1357 | *isFixedWidth = FT_IS_FIXED_WIDTH(face); |
| 1358 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1359 | |
| 1360 | FT_Done_Face(face); |
| 1361 | FT_Done_FreeType(library); |
djsollen@google.com | 4dc686d | 2012-02-15 21:03:45 +0000 | [diff] [blame] | 1362 | return true; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1363 | } |