bungeman@google.com | fe755b4 | 2014-01-28 20:33:09 +0000 | [diff] [blame] | 1 | |
epoger@google.com | ec3ed6a | 2011-07-28 14:26:00 +0000 | [diff] [blame] | 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 | |
commit-bot@chromium.org | ba9354b | 2014-02-10 19:58:49 +0000 | [diff] [blame^] | 9 | #include "SkAdvancedTypefaceMetrics.h" |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 10 | #include "SkBitmap.h" |
| 11 | #include "SkCanvas.h" |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 12 | #include "SkColorPriv.h" |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 13 | #include "SkDescriptor.h" |
| 14 | #include "SkFDot6.h" |
bungeman@google.com | 3aacb41 | 2012-03-13 14:55:12 +0000 | [diff] [blame] | 15 | #include "SkFloatingPoint.h" |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 16 | #include "SkFontHost.h" |
george@mozilla.com | c59b5da | 2012-08-23 00:39:08 +0000 | [diff] [blame] | 17 | #include "SkFontHost_FreeType_common.h" |
bungeman@google.com | bbe5013 | 2012-07-24 20:33:21 +0000 | [diff] [blame] | 18 | #include "SkGlyph.h" |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 19 | #include "SkMask.h" |
bungeman@google.com | 97efada | 2012-07-30 20:40:50 +0000 | [diff] [blame] | 20 | #include "SkMaskGamma.h" |
bungeman@google.com | a980269 | 2013-08-07 02:45:25 +0000 | [diff] [blame] | 21 | #include "SkOTUtils.h" |
commit-bot@chromium.org | ba9354b | 2014-02-10 19:58:49 +0000 | [diff] [blame^] | 22 | #include "SkOnce.h" |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 23 | #include "SkScalerContext.h" |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 24 | #include "SkStream.h" |
| 25 | #include "SkString.h" |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 26 | #include "SkTemplates.h" |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 27 | #include "SkThread.h" |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 28 | |
bungeman@google.com | fd668cf | 2012-08-24 17:46:11 +0000 | [diff] [blame] | 29 | #if defined(SK_CAN_USE_DLOPEN) |
| 30 | #include <dlfcn.h> |
| 31 | #endif |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 32 | #include <ft2build.h> |
| 33 | #include FT_FREETYPE_H |
| 34 | #include FT_OUTLINE_H |
| 35 | #include FT_SIZES_H |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 36 | #include FT_TRUETYPE_TABLES_H |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 37 | #include FT_TYPE1_TABLES_H |
agl@chromium.org | e76073b | 2010-06-04 20:31:17 +0000 | [diff] [blame] | 38 | #include FT_BITMAP_H |
agl@chromium.org | 36bb697 | 2010-06-04 20:57:16 +0000 | [diff] [blame] | 39 | // In the past, FT_GlyphSlot_Own_Bitmap was defined in this header file. |
| 40 | #include FT_SYNTHESIS_H |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 41 | #include FT_XFREE86_H |
epoger@google.com | 5070d79 | 2011-06-29 20:43:14 +0000 | [diff] [blame] | 42 | #ifdef FT_LCD_FILTER_H |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame] | 43 | #include FT_LCD_FILTER_H |
epoger@google.com | 5070d79 | 2011-06-29 20:43:14 +0000 | [diff] [blame] | 44 | #endif |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame] | 45 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 46 | #ifdef FT_ADVANCES_H |
| 47 | #include FT_ADVANCES_H |
| 48 | #endif |
| 49 | |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 50 | #if 0 |
| 51 | // Also include the files by name for build tools which require this. |
| 52 | #include <freetype/freetype.h> |
| 53 | #include <freetype/ftoutln.h> |
| 54 | #include <freetype/ftsizes.h> |
| 55 | #include <freetype/tttables.h> |
| 56 | #include <freetype/ftadvanc.h> |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame] | 57 | #include <freetype/ftlcdfil.h> |
agl@chromium.org | e76073b | 2010-06-04 20:31:17 +0000 | [diff] [blame] | 58 | #include <freetype/ftbitmap.h> |
agl@chromium.org | 36bb697 | 2010-06-04 20:57:16 +0000 | [diff] [blame] | 59 | #include <freetype/ftsynth.h> |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 60 | #endif |
| 61 | |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 62 | // FT_LOAD_COLOR and the corresponding FT_Pixel_Mode::FT_PIXEL_MODE_BGRA |
| 63 | // were introduced in FreeType 2.5.0. |
| 64 | // The following may be removed once FreeType 2.5.0 is required to build. |
| 65 | #ifndef FT_LOAD_COLOR |
| 66 | # define FT_LOAD_COLOR ( 1L << 20 ) |
| 67 | # define FT_PIXEL_MODE_BGRA 7 |
| 68 | #endif |
| 69 | |
| 70 | // FT_HAS_COLOR and the corresponding FT_FACE_FLAG_COLOR |
| 71 | // were introduced in FreeType 2.5.1 |
| 72 | // The following may be removed once FreeType 2.5.1 is required to build. |
| 73 | #ifndef FT_HAS_COLOR |
| 74 | # define FT_HAS_COLOR(face) false |
| 75 | #endif |
| 76 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 77 | //#define ENABLE_GLYPH_SPEW // for tracing calls |
| 78 | //#define DUMP_STRIKE_CREATION |
| 79 | |
reed@google.com | 1ac8350 | 2012-02-28 17:06:02 +0000 | [diff] [blame] | 80 | //#define SK_GAMMA_APPLY_TO_A8 |
reed@google.com | 1ac8350 | 2012-02-28 17:06:02 +0000 | [diff] [blame] | 81 | |
vandebo@chromium.org | 6f72d1e | 2011-02-14 23:19:59 +0000 | [diff] [blame] | 82 | using namespace skia_advanced_typeface_metrics_utils; |
| 83 | |
reed@google.com | effc501 | 2011-06-27 16:44:46 +0000 | [diff] [blame] | 84 | static bool isLCD(const SkScalerContext::Rec& rec) { |
| 85 | switch (rec.fMaskFormat) { |
| 86 | case SkMask::kLCD16_Format: |
| 87 | case SkMask::kLCD32_Format: |
| 88 | return true; |
| 89 | default: |
| 90 | return false; |
| 91 | } |
| 92 | } |
| 93 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 94 | ////////////////////////////////////////////////////////////////////////// |
| 95 | |
| 96 | struct SkFaceRec; |
| 97 | |
digit@google.com | 1771cbf | 2012-01-26 21:26:40 +0000 | [diff] [blame] | 98 | SK_DECLARE_STATIC_MUTEX(gFTMutex); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 99 | static int gFTCount; |
| 100 | static FT_Library gFTLibrary; |
| 101 | static SkFaceRec* gFaceRecHead; |
agl@chromium.org | f18d876 | 2009-07-28 18:38:08 +0000 | [diff] [blame] | 102 | static bool gLCDSupportValid; // true iff |gLCDSupport| has been set. |
| 103 | static bool gLCDSupport; // true iff LCD is supported by the runtime. |
reed@google.com | a1c3256 | 2012-03-01 19:38:23 +0000 | [diff] [blame] | 104 | static int gLCDExtra; // number of extra pixels for filtering. |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 105 | |
bungeman@google.com | 62566f3 | 2012-10-13 03:21:53 +0000 | [diff] [blame] | 106 | ///////////////////////////////////////////////////////////////////////// |
| 107 | |
bungeman@google.com | fd668cf | 2012-08-24 17:46:11 +0000 | [diff] [blame] | 108 | // FT_Library_SetLcdFilterWeights was introduced in FreeType 2.4.0. |
| 109 | // The following platforms provide FreeType of at least 2.4.0. |
| 110 | // Ubuntu >= 11.04 (previous deprecated April 2013) |
| 111 | // Debian >= 6.0 (good) |
| 112 | // OpenSuse >= 11.4 (previous deprecated January 2012 / Nov 2013 for Evergreen 11.2) |
| 113 | // Fedora >= 14 (good) |
| 114 | // Android >= Gingerbread (good) |
| 115 | typedef FT_Error (*FT_Library_SetLcdFilterWeightsProc)(FT_Library, unsigned char*); |
| 116 | |
scroggo@google.com | 94bc60f | 2012-10-04 20:45:06 +0000 | [diff] [blame] | 117 | // Caller must lock gFTMutex before calling this function. |
bungeman@google.com | fd668cf | 2012-08-24 17:46:11 +0000 | [diff] [blame] | 118 | static bool InitFreetype() { |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame] | 119 | FT_Error err = FT_Init_FreeType(&gFTLibrary); |
reed@google.com | ea2333d | 2011-03-14 16:44:56 +0000 | [diff] [blame] | 120 | if (err) { |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame] | 121 | return false; |
reed@google.com | ea2333d | 2011-03-14 16:44:56 +0000 | [diff] [blame] | 122 | } |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame] | 123 | |
bungeman@google.com | fd668cf | 2012-08-24 17:46:11 +0000 | [diff] [blame] | 124 | // Setup LCD filtering. This reduces color fringes for LCD smoothed glyphs. |
epoger@google.com | b371ed1 | 2011-06-29 21:20:52 +0000 | [diff] [blame] | 125 | #ifdef FT_LCD_FILTER_H |
bungeman@google.com | 62566f3 | 2012-10-13 03:21:53 +0000 | [diff] [blame] | 126 | // Use default { 0x10, 0x40, 0x70, 0x40, 0x10 }, as it adds up to 0x110, simulating ink spread. |
| 127 | // SetLcdFilter must be called before SetLcdFilterWeights. |
| 128 | err = FT_Library_SetLcdFilter(gFTLibrary, FT_LCD_FILTER_DEFAULT); |
bungeman@google.com | fd668cf | 2012-08-24 17:46:11 +0000 | [diff] [blame] | 129 | if (0 == err) { |
| 130 | gLCDSupport = true; |
| 131 | gLCDExtra = 2; //Using a filter adds one full pixel to each side. |
| 132 | |
bungeman@google.com | 62566f3 | 2012-10-13 03:21:53 +0000 | [diff] [blame] | 133 | #ifdef SK_FONTHOST_FREETYPE_USE_NORMAL_LCD_FILTER |
| 134 | // This also adds to 0x110 simulating ink spread, but provides better results than default. |
| 135 | static unsigned char gGaussianLikeHeavyWeights[] = { 0x1A, 0x43, 0x56, 0x43, 0x1A, }; |
bungeman@google.com | fd668cf | 2012-08-24 17:46:11 +0000 | [diff] [blame] | 136 | |
| 137 | #if defined(SK_FONTHOST_FREETYPE_RUNTIME_VERSION) && \ |
| 138 | SK_FONTHOST_FREETYPE_RUNTIME_VERSION > 0x020400 |
bungeman@google.com | 62566f3 | 2012-10-13 03:21:53 +0000 | [diff] [blame] | 139 | err = FT_Library_SetLcdFilterWeights(gFTLibrary, gGaussianLikeHeavyWeights); |
bungeman@google.com | fd668cf | 2012-08-24 17:46:11 +0000 | [diff] [blame] | 140 | #elif defined(SK_CAN_USE_DLOPEN) && SK_CAN_USE_DLOPEN == 1 |
| 141 | //The FreeType library is already loaded, so symbols are available in process. |
| 142 | void* self = dlopen(NULL, RTLD_LAZY); |
| 143 | if (NULL != self) { |
| 144 | FT_Library_SetLcdFilterWeightsProc setLcdFilterWeights; |
| 145 | //The following cast is non-standard, but safe for POSIX. |
| 146 | *reinterpret_cast<void**>(&setLcdFilterWeights) = dlsym(self, "FT_Library_SetLcdFilterWeights"); |
| 147 | dlclose(self); |
| 148 | |
| 149 | if (NULL != setLcdFilterWeights) { |
bungeman@google.com | 62566f3 | 2012-10-13 03:21:53 +0000 | [diff] [blame] | 150 | err = setLcdFilterWeights(gFTLibrary, gGaussianLikeHeavyWeights); |
bungeman@google.com | fd668cf | 2012-08-24 17:46:11 +0000 | [diff] [blame] | 151 | } |
| 152 | } |
| 153 | #endif |
bungeman@google.com | 62566f3 | 2012-10-13 03:21:53 +0000 | [diff] [blame] | 154 | #endif |
reed@google.com | a1c3256 | 2012-03-01 19:38:23 +0000 | [diff] [blame] | 155 | } |
epoger@google.com | 5070d79 | 2011-06-29 20:43:14 +0000 | [diff] [blame] | 156 | #else |
| 157 | gLCDSupport = false; |
| 158 | #endif |
reed@android.com | 61608aa | 2009-07-31 14:52:54 +0000 | [diff] [blame] | 159 | gLCDSupportValid = true; |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame] | 160 | |
| 161 | return true; |
| 162 | } |
| 163 | |
commit-bot@chromium.org | ba9354b | 2014-02-10 19:58:49 +0000 | [diff] [blame^] | 164 | // Called while holding gFTMutex. |
| 165 | static void determine_lcd_support(bool* lcdSupported) { |
| 166 | if (!gLCDSupportValid) { |
| 167 | // This will determine LCD support as a side effect. |
| 168 | InitFreetype(); |
| 169 | FT_Done_FreeType(gFTLibrary); |
| 170 | } |
| 171 | SkASSERT(gLCDSupportValid); |
| 172 | *lcdSupported = gLCDSupport; |
| 173 | } |
| 174 | |
reed@google.com | fb2fdcc | 2012-10-17 15:49:36 +0000 | [diff] [blame] | 175 | // Lazy, once, wrapper to ask the FreeType Library if it can support LCD text |
| 176 | static bool is_lcd_supported() { |
commit-bot@chromium.org | ba9354b | 2014-02-10 19:58:49 +0000 | [diff] [blame^] | 177 | static bool lcdSupported = false; |
| 178 | SkOnce(&gLCDSupportValid, &gFTMutex, determine_lcd_support, &lcdSupported); |
| 179 | return lcdSupported; |
reed@google.com | fb2fdcc | 2012-10-17 15:49:36 +0000 | [diff] [blame] | 180 | } |
| 181 | |
george@mozilla.com | c59b5da | 2012-08-23 00:39:08 +0000 | [diff] [blame] | 182 | class SkScalerContext_FreeType : public SkScalerContext_FreeType_Base { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 183 | public: |
reed@google.com | 0da4861 | 2013-03-19 16:06:52 +0000 | [diff] [blame] | 184 | SkScalerContext_FreeType(SkTypeface*, const SkDescriptor* desc); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 185 | virtual ~SkScalerContext_FreeType(); |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 186 | |
reed@android.com | 62900b4 | 2009-02-11 15:07:19 +0000 | [diff] [blame] | 187 | bool success() const { |
reed@android.com | a0f5d15 | 2009-06-22 17:38:10 +0000 | [diff] [blame] | 188 | return fFaceRec != NULL && |
| 189 | fFTSize != NULL && |
| 190 | fFace != NULL; |
reed@android.com | 62900b4 | 2009-02-11 15:07:19 +0000 | [diff] [blame] | 191 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 192 | |
| 193 | protected: |
bungeman@google.com | a76de72 | 2012-10-26 19:35:54 +0000 | [diff] [blame] | 194 | virtual unsigned generateGlyphCount() SK_OVERRIDE; |
| 195 | virtual uint16_t generateCharToGlyph(SkUnichar uni) SK_OVERRIDE; |
| 196 | virtual void generateAdvance(SkGlyph* glyph) SK_OVERRIDE; |
| 197 | virtual void generateMetrics(SkGlyph* glyph) SK_OVERRIDE; |
| 198 | virtual void generateImage(const SkGlyph& glyph) SK_OVERRIDE; |
| 199 | virtual void generatePath(const SkGlyph& glyph, SkPath* path) SK_OVERRIDE; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 200 | virtual void generateFontMetrics(SkPaint::FontMetrics* mx, |
bungeman@google.com | a76de72 | 2012-10-26 19:35:54 +0000 | [diff] [blame] | 201 | SkPaint::FontMetrics* my) SK_OVERRIDE; |
| 202 | virtual SkUnichar generateGlyphToChar(uint16_t glyph) SK_OVERRIDE; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 203 | |
| 204 | private: |
| 205 | SkFaceRec* fFaceRec; |
| 206 | FT_Face fFace; // reference to shared face in gFaceRecHead |
| 207 | FT_Size fFTSize; // our own copy |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 208 | FT_Int fStrikeIndex; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 209 | SkFixed fScaleX, fScaleY; |
| 210 | FT_Matrix fMatrix22; |
| 211 | uint32_t fLoadGlyphFlags; |
reed@google.com | bdc9988 | 2011-11-21 14:36:57 +0000 | [diff] [blame] | 212 | bool fDoLinearMetrics; |
reed@google.com | a1bfa21 | 2012-03-08 21:57:12 +0000 | [diff] [blame] | 213 | bool fLCDIsVert; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 214 | |
reed@google.com | f073b33 | 2013-05-06 12:21:16 +0000 | [diff] [blame] | 215 | // Need scalar versions for generateFontMetrics |
| 216 | SkVector fScale; |
| 217 | SkMatrix fMatrix22Scalar; |
| 218 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 219 | FT_Error setupSize(); |
djsollen@google.com | d8b599c | 2012-03-19 19:44:19 +0000 | [diff] [blame] | 220 | void getBBoxForCurrentGlyph(SkGlyph* glyph, FT_BBox* bbox, |
| 221 | bool snapToPixelBoundary = false); |
bungeman@google.com | cbe1b54 | 2013-12-16 17:02:39 +0000 | [diff] [blame] | 222 | bool getCBoxForLetter(char letter, FT_BBox* bbox); |
scroggo@google.com | 94bc60f | 2012-10-04 20:45:06 +0000 | [diff] [blame] | 223 | // Caller must lock gFTMutex before calling this function. |
djsollen@google.com | d8b599c | 2012-03-19 19:44:19 +0000 | [diff] [blame] | 224 | void updateGlyphIfLCD(SkGlyph* glyph); |
commit-bot@chromium.org | 6fa81d7 | 2013-12-26 15:50:29 +0000 | [diff] [blame] | 225 | // Caller must lock gFTMutex before calling this function. |
| 226 | // update FreeType2 glyph slot with glyph emboldened |
| 227 | void emboldenIfNeeded(FT_Face face, FT_GlyphSlot glyph); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 228 | }; |
| 229 | |
| 230 | /////////////////////////////////////////////////////////////////////////// |
| 231 | /////////////////////////////////////////////////////////////////////////// |
| 232 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 233 | struct SkFaceRec { |
| 234 | SkFaceRec* fNext; |
| 235 | FT_Face fFace; |
| 236 | FT_StreamRec fFTStream; |
| 237 | SkStream* fSkStream; |
| 238 | uint32_t fRefCnt; |
| 239 | uint32_t fFontID; |
| 240 | |
reed@android.com | b1d9d2e | 2009-03-04 17:37:51 +0000 | [diff] [blame] | 241 | // assumes ownership of the stream, will call unref() when its done |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 242 | SkFaceRec(SkStream* strm, uint32_t fontID); |
| 243 | ~SkFaceRec() { |
reed@android.com | b1d9d2e | 2009-03-04 17:37:51 +0000 | [diff] [blame] | 244 | fSkStream->unref(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 245 | } |
| 246 | }; |
| 247 | |
| 248 | extern "C" { |
| 249 | static unsigned long sk_stream_read(FT_Stream stream, |
| 250 | unsigned long offset, |
| 251 | unsigned char* buffer, |
| 252 | unsigned long count ) { |
| 253 | SkStream* str = (SkStream*)stream->descriptor.pointer; |
| 254 | |
| 255 | if (count) { |
| 256 | if (!str->rewind()) { |
| 257 | return 0; |
| 258 | } else { |
| 259 | unsigned long ret; |
| 260 | if (offset) { |
| 261 | ret = str->read(NULL, offset); |
| 262 | if (ret != offset) { |
| 263 | return 0; |
| 264 | } |
| 265 | } |
| 266 | ret = str->read(buffer, count); |
| 267 | if (ret != count) { |
| 268 | return 0; |
| 269 | } |
| 270 | count = ret; |
| 271 | } |
| 272 | } |
| 273 | return count; |
| 274 | } |
| 275 | |
sugoi@google.com | 66a58ac | 2013-03-05 20:40:52 +0000 | [diff] [blame] | 276 | static void sk_stream_close(FT_Stream) {} |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 277 | } |
| 278 | |
| 279 | SkFaceRec::SkFaceRec(SkStream* strm, uint32_t fontID) |
vandebo@chromium.org | 9af25f3 | 2012-03-28 21:24:27 +0000 | [diff] [blame] | 280 | : fNext(NULL), fSkStream(strm), fRefCnt(1), fFontID(fontID) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 281 | // SkDEBUGF(("SkFaceRec: opening %s (%p)\n", key.c_str(), strm)); |
| 282 | |
reed@android.com | 4516f47 | 2009-06-29 16:25:36 +0000 | [diff] [blame] | 283 | sk_bzero(&fFTStream, sizeof(fFTStream)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 284 | fFTStream.size = fSkStream->getLength(); |
| 285 | fFTStream.descriptor.pointer = fSkStream; |
| 286 | fFTStream.read = sk_stream_read; |
| 287 | fFTStream.close = sk_stream_close; |
| 288 | } |
| 289 | |
reed@android.com | 62900b4 | 2009-02-11 15:07:19 +0000 | [diff] [blame] | 290 | // Will return 0 on failure |
scroggo@google.com | 94bc60f | 2012-10-04 20:45:06 +0000 | [diff] [blame] | 291 | // Caller must lock gFTMutex before calling this function. |
reed@google.com | 2cdc671 | 2013-03-21 18:22:00 +0000 | [diff] [blame] | 292 | static SkFaceRec* ref_ft_face(const SkTypeface* typeface) { |
| 293 | const SkFontID fontID = typeface->uniqueID(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 294 | SkFaceRec* rec = gFaceRecHead; |
| 295 | while (rec) { |
| 296 | if (rec->fFontID == fontID) { |
| 297 | SkASSERT(rec->fFace); |
| 298 | rec->fRefCnt += 1; |
| 299 | return rec; |
| 300 | } |
| 301 | rec = rec->fNext; |
| 302 | } |
| 303 | |
reed@google.com | 2cdc671 | 2013-03-21 18:22:00 +0000 | [diff] [blame] | 304 | int face_index; |
| 305 | SkStream* strm = typeface->openStream(&face_index); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 306 | if (NULL == strm) { |
reed@google.com | 2cdc671 | 2013-03-21 18:22:00 +0000 | [diff] [blame] | 307 | return NULL; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 308 | } |
| 309 | |
| 310 | // this passes ownership of strm to the rec |
| 311 | rec = SkNEW_ARGS(SkFaceRec, (strm, fontID)); |
| 312 | |
| 313 | FT_Open_Args args; |
| 314 | memset(&args, 0, sizeof(args)); |
| 315 | const void* memoryBase = strm->getMemoryBase(); |
| 316 | |
| 317 | if (NULL != memoryBase) { |
| 318 | //printf("mmap(%s)\n", keyString.c_str()); |
| 319 | args.flags = FT_OPEN_MEMORY; |
| 320 | args.memory_base = (const FT_Byte*)memoryBase; |
| 321 | args.memory_size = strm->getLength(); |
| 322 | } else { |
| 323 | //printf("fopen(%s)\n", keyString.c_str()); |
| 324 | args.flags = FT_OPEN_STREAM; |
| 325 | args.stream = &rec->fFTStream; |
| 326 | } |
| 327 | |
reed@google.com | 2cdc671 | 2013-03-21 18:22:00 +0000 | [diff] [blame] | 328 | FT_Error err = FT_Open_Face(gFTLibrary, &args, face_index, &rec->fFace); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 329 | if (err) { // bad filename, try the default font |
| 330 | fprintf(stderr, "ERROR: unable to open font '%x'\n", fontID); |
| 331 | SkDELETE(rec); |
reed@google.com | 2cdc671 | 2013-03-21 18:22:00 +0000 | [diff] [blame] | 332 | return NULL; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 333 | } else { |
| 334 | SkASSERT(rec->fFace); |
| 335 | //fprintf(stderr, "Opened font '%s'\n", filename.c_str()); |
| 336 | rec->fNext = gFaceRecHead; |
| 337 | gFaceRecHead = rec; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 338 | return rec; |
| 339 | } |
| 340 | } |
| 341 | |
scroggo@google.com | 94bc60f | 2012-10-04 20:45:06 +0000 | [diff] [blame] | 342 | // Caller must lock gFTMutex before calling this function. |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 343 | static void unref_ft_face(FT_Face face) { |
| 344 | SkFaceRec* rec = gFaceRecHead; |
| 345 | SkFaceRec* prev = NULL; |
| 346 | while (rec) { |
| 347 | SkFaceRec* next = rec->fNext; |
| 348 | if (rec->fFace == face) { |
| 349 | if (--rec->fRefCnt == 0) { |
| 350 | if (prev) { |
| 351 | prev->fNext = next; |
| 352 | } else { |
| 353 | gFaceRecHead = next; |
| 354 | } |
| 355 | FT_Done_Face(face); |
| 356 | SkDELETE(rec); |
| 357 | } |
| 358 | return; |
| 359 | } |
| 360 | prev = rec; |
| 361 | rec = next; |
| 362 | } |
tomhudson@google.com | 0c00f21 | 2011-12-28 14:59:50 +0000 | [diff] [blame] | 363 | SkDEBUGFAIL("shouldn't get here, face not in list"); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 364 | } |
| 365 | |
reed@google.com | b4162b1 | 2013-07-02 16:32:29 +0000 | [diff] [blame] | 366 | class AutoFTAccess { |
| 367 | public: |
| 368 | AutoFTAccess(const SkTypeface* tf) : fRec(NULL), fFace(NULL) { |
| 369 | gFTMutex.acquire(); |
| 370 | if (1 == ++gFTCount) { |
| 371 | if (!InitFreetype()) { |
| 372 | sk_throw(); |
| 373 | } |
| 374 | } |
| 375 | fRec = ref_ft_face(tf); |
| 376 | if (fRec) { |
| 377 | fFace = fRec->fFace; |
| 378 | } |
| 379 | } |
| 380 | |
| 381 | ~AutoFTAccess() { |
| 382 | if (fFace) { |
| 383 | unref_ft_face(fFace); |
| 384 | } |
| 385 | if (0 == --gFTCount) { |
| 386 | FT_Done_FreeType(gFTLibrary); |
| 387 | } |
| 388 | gFTMutex.release(); |
| 389 | } |
| 390 | |
| 391 | SkFaceRec* rec() { return fRec; } |
| 392 | FT_Face face() { return fFace; } |
| 393 | |
| 394 | private: |
| 395 | SkFaceRec* fRec; |
| 396 | FT_Face fFace; |
| 397 | }; |
| 398 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 399 | /////////////////////////////////////////////////////////////////////////// |
| 400 | |
vandebo@chromium.org | 16be6b8 | 2011-01-28 21:28:56 +0000 | [diff] [blame] | 401 | // Work around for old versions of freetype. |
| 402 | static FT_Error getAdvances(FT_Face face, FT_UInt start, FT_UInt count, |
| 403 | FT_Int32 loadFlags, FT_Fixed* advances) { |
| 404 | #ifdef FT_ADVANCES_H |
| 405 | return FT_Get_Advances(face, start, count, loadFlags, advances); |
| 406 | #else |
| 407 | if (!face || start >= face->num_glyphs || |
| 408 | start + count > face->num_glyphs || loadFlags != FT_LOAD_NO_SCALE) { |
| 409 | return 6; // "Invalid argument." |
| 410 | } |
| 411 | if (count == 0) |
| 412 | return 0; |
| 413 | |
| 414 | for (int i = 0; i < count; i++) { |
| 415 | FT_Error err = FT_Load_Glyph(face, start + i, FT_LOAD_NO_SCALE); |
| 416 | if (err) |
| 417 | return err; |
| 418 | advances[i] = face->glyph->advance.x; |
| 419 | } |
| 420 | |
| 421 | return 0; |
| 422 | #endif |
| 423 | } |
| 424 | |
| 425 | static bool canEmbed(FT_Face face) { |
djsollen@google.com | fa394d4 | 2012-01-09 20:40:25 +0000 | [diff] [blame] | 426 | #ifdef FT_FSTYPE_RESTRICTED_LICENSE_EMBEDDING |
vandebo@chromium.org | 16be6b8 | 2011-01-28 21:28:56 +0000 | [diff] [blame] | 427 | FT_UShort fsType = FT_Get_FSType_Flags(face); |
| 428 | return (fsType & (FT_FSTYPE_RESTRICTED_LICENSE_EMBEDDING | |
| 429 | FT_FSTYPE_BITMAP_EMBEDDING_ONLY)) == 0; |
| 430 | #else |
| 431 | // No embedding is 0x2 and bitmap embedding only is 0x200. |
| 432 | TT_OS2* os2_table; |
| 433 | if ((os2_table = (TT_OS2*)FT_Get_Sfnt_Table(face, ft_sfnt_os2)) != NULL) { |
| 434 | return (os2_table->fsType & 0x202) == 0; |
| 435 | } |
| 436 | return false; // We tried, fail safe. |
| 437 | #endif |
| 438 | } |
| 439 | |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 440 | static bool GetLetterCBox(FT_Face face, char letter, FT_BBox* bbox) { |
| 441 | const FT_UInt glyph_id = FT_Get_Char_Index(face, letter); |
| 442 | if (!glyph_id) |
| 443 | return false; |
bungeman@google.com | cbe1b54 | 2013-12-16 17:02:39 +0000 | [diff] [blame] | 444 | if (FT_Load_Glyph(face, glyph_id, FT_LOAD_NO_SCALE) != 0) |
| 445 | return false; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 446 | FT_Outline_Get_CBox(&face->glyph->outline, bbox); |
| 447 | return true; |
| 448 | } |
| 449 | |
vandebo@chromium.org | 6f72d1e | 2011-02-14 23:19:59 +0000 | [diff] [blame] | 450 | static bool getWidthAdvance(FT_Face face, int gId, int16_t* data) { |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 451 | FT_Fixed advance = 0; |
vandebo@chromium.org | 6f72d1e | 2011-02-14 23:19:59 +0000 | [diff] [blame] | 452 | if (getAdvances(face, gId, 1, FT_LOAD_NO_SCALE, &advance)) { |
| 453 | return false; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 454 | } |
vandebo@chromium.org | 6f72d1e | 2011-02-14 23:19:59 +0000 | [diff] [blame] | 455 | SkASSERT(data); |
| 456 | *data = advance; |
| 457 | return true; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 458 | } |
| 459 | |
vandebo@chromium.org | 6744d49 | 2011-05-09 18:13:47 +0000 | [diff] [blame] | 460 | static void populate_glyph_to_unicode(FT_Face& face, |
| 461 | SkTDArray<SkUnichar>* glyphToUnicode) { |
| 462 | // Check and see if we have Unicode cmaps. |
| 463 | for (int i = 0; i < face->num_charmaps; ++i) { |
| 464 | // CMaps known to support Unicode: |
| 465 | // Platform ID Encoding ID Name |
| 466 | // ----------- ----------- ----------------------------------- |
| 467 | // 0 0,1 Apple Unicode |
| 468 | // 0 3 Apple Unicode 2.0 (preferred) |
| 469 | // 3 1 Microsoft Unicode UCS-2 |
| 470 | // 3 10 Microsoft Unicode UCS-4 (preferred) |
| 471 | // |
| 472 | // See Apple TrueType Reference Manual |
| 473 | // http://developer.apple.com/fonts/TTRefMan/RM06/Chap6cmap.html |
| 474 | // http://developer.apple.com/fonts/TTRefMan/RM06/Chap6name.html#ID |
| 475 | // Microsoft OpenType Specification |
| 476 | // http://www.microsoft.com/typography/otspec/cmap.htm |
| 477 | |
| 478 | FT_UShort platformId = face->charmaps[i]->platform_id; |
| 479 | FT_UShort encodingId = face->charmaps[i]->encoding_id; |
| 480 | |
| 481 | if (platformId != 0 && platformId != 3) { |
| 482 | continue; |
| 483 | } |
| 484 | if (platformId == 3 && encodingId != 1 && encodingId != 10) { |
| 485 | continue; |
| 486 | } |
| 487 | bool preferredMap = ((platformId == 3 && encodingId == 10) || |
| 488 | (platformId == 0 && encodingId == 3)); |
| 489 | |
| 490 | FT_Set_Charmap(face, face->charmaps[i]); |
| 491 | if (glyphToUnicode->isEmpty()) { |
| 492 | glyphToUnicode->setCount(face->num_glyphs); |
| 493 | memset(glyphToUnicode->begin(), 0, |
| 494 | sizeof(SkUnichar) * face->num_glyphs); |
| 495 | } |
| 496 | |
| 497 | // Iterate through each cmap entry. |
| 498 | FT_UInt glyphIndex; |
| 499 | for (SkUnichar charCode = FT_Get_First_Char(face, &glyphIndex); |
| 500 | glyphIndex != 0; |
| 501 | charCode = FT_Get_Next_Char(face, charCode, &glyphIndex)) { |
| 502 | if (charCode && |
| 503 | ((*glyphToUnicode)[glyphIndex] == 0 || preferredMap)) { |
| 504 | (*glyphToUnicode)[glyphIndex] = charCode; |
| 505 | } |
| 506 | } |
| 507 | } |
| 508 | } |
| 509 | |
reed@google.com | 2689f61 | 2013-03-20 20:01:47 +0000 | [diff] [blame] | 510 | SkAdvancedTypefaceMetrics* SkTypeface_FreeType::onGetAdvancedTypefaceMetrics( |
vandebo@chromium.org | 37ad8fb | 2011-08-18 02:38:50 +0000 | [diff] [blame] | 511 | SkAdvancedTypefaceMetrics::PerGlyphInfo perGlyphInfo, |
| 512 | const uint32_t* glyphIDs, |
reed@google.com | 2689f61 | 2013-03-20 20:01:47 +0000 | [diff] [blame] | 513 | uint32_t glyphIDsCount) const { |
djsollen@google.com | da95772 | 2011-11-16 17:00:46 +0000 | [diff] [blame] | 514 | #if defined(SK_BUILD_FOR_MAC) |
reed@google.com | 8a5d692 | 2011-03-14 15:08:03 +0000 | [diff] [blame] | 515 | return NULL; |
| 516 | #else |
reed@google.com | b4162b1 | 2013-07-02 16:32:29 +0000 | [diff] [blame] | 517 | AutoFTAccess fta(this); |
| 518 | FT_Face face = fta.face(); |
| 519 | if (!face) { |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 520 | return NULL; |
reed@google.com | b4162b1 | 2013-07-02 16:32:29 +0000 | [diff] [blame] | 521 | } |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 522 | |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 523 | SkAdvancedTypefaceMetrics* info = new SkAdvancedTypefaceMetrics; |
| 524 | info->fFontName.set(FT_Get_Postscript_Name(face)); |
vandebo@chromium.org | 5f209e6 | 2013-12-10 17:22:41 +0000 | [diff] [blame] | 525 | info->fMultiMaster = FT_HAS_MULTIPLE_MASTERS(face); |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 526 | info->fLastGlyphID = face->num_glyphs - 1; |
| 527 | info->fEmSize = 1000; |
| 528 | |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 529 | bool cid = false; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 530 | const char* fontType = FT_Get_X11_Font_Format(face); |
vandebo@chromium.org | c3a2ae5 | 2011-02-03 21:48:23 +0000 | [diff] [blame] | 531 | if (strcmp(fontType, "Type 1") == 0) { |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 532 | info->fType = SkAdvancedTypefaceMetrics::kType1_Font; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 533 | } else if (strcmp(fontType, "CID Type 1") == 0) { |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 534 | info->fType = SkAdvancedTypefaceMetrics::kType1CID_Font; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 535 | cid = true; |
| 536 | } else if (strcmp(fontType, "CFF") == 0) { |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 537 | info->fType = SkAdvancedTypefaceMetrics::kCFF_Font; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 538 | } else if (strcmp(fontType, "TrueType") == 0) { |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 539 | info->fType = SkAdvancedTypefaceMetrics::kTrueType_Font; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 540 | cid = true; |
| 541 | TT_Header* ttHeader; |
| 542 | if ((ttHeader = (TT_Header*)FT_Get_Sfnt_Table(face, |
| 543 | ft_sfnt_head)) != NULL) { |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 544 | info->fEmSize = ttHeader->Units_Per_EM; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 545 | } |
bungeman@google.com | 4d71db8 | 2013-12-02 19:10:02 +0000 | [diff] [blame] | 546 | } else { |
| 547 | info->fType = SkAdvancedTypefaceMetrics::kOther_Font; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 548 | } |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 549 | |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 550 | info->fStyle = 0; |
| 551 | if (FT_IS_FIXED_WIDTH(face)) |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 552 | info->fStyle |= SkAdvancedTypefaceMetrics::kFixedPitch_Style; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 553 | if (face->style_flags & FT_STYLE_FLAG_ITALIC) |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 554 | info->fStyle |= SkAdvancedTypefaceMetrics::kItalic_Style; |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 555 | |
| 556 | PS_FontInfoRec ps_info; |
| 557 | TT_Postscript* tt_info; |
| 558 | if (FT_Get_PS_Font_Info(face, &ps_info) == 0) { |
| 559 | info->fItalicAngle = ps_info.italic_angle; |
| 560 | } else if ((tt_info = |
| 561 | (TT_Postscript*)FT_Get_Sfnt_Table(face, |
| 562 | ft_sfnt_post)) != NULL) { |
| 563 | info->fItalicAngle = SkFixedToScalar(tt_info->italicAngle); |
| 564 | } else { |
| 565 | info->fItalicAngle = 0; |
| 566 | } |
| 567 | |
| 568 | info->fAscent = face->ascender; |
| 569 | info->fDescent = face->descender; |
| 570 | |
| 571 | // Figure out a good guess for StemV - Min width of i, I, !, 1. |
| 572 | // This probably isn't very good with an italic font. |
| 573 | int16_t min_width = SHRT_MAX; |
vandebo@chromium.org | 6f72d1e | 2011-02-14 23:19:59 +0000 | [diff] [blame] | 574 | info->fStemV = 0; |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 575 | char stem_chars[] = {'i', 'I', '!', '1'}; |
| 576 | for (size_t i = 0; i < SK_ARRAY_COUNT(stem_chars); i++) { |
| 577 | FT_BBox bbox; |
| 578 | if (GetLetterCBox(face, stem_chars[i], &bbox)) { |
| 579 | int16_t width = bbox.xMax - bbox.xMin; |
| 580 | if (width > 0 && width < min_width) { |
| 581 | min_width = width; |
| 582 | info->fStemV = min_width; |
| 583 | } |
| 584 | } |
| 585 | } |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 586 | |
| 587 | TT_PCLT* pclt_info; |
| 588 | TT_OS2* os2_table; |
| 589 | if ((pclt_info = (TT_PCLT*)FT_Get_Sfnt_Table(face, ft_sfnt_pclt)) != NULL) { |
| 590 | info->fCapHeight = pclt_info->CapHeight; |
| 591 | uint8_t serif_style = pclt_info->SerifStyle & 0x3F; |
| 592 | if (serif_style >= 2 && serif_style <= 6) |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 593 | info->fStyle |= SkAdvancedTypefaceMetrics::kSerif_Style; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 594 | else if (serif_style >= 9 && serif_style <= 12) |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 595 | info->fStyle |= SkAdvancedTypefaceMetrics::kScript_Style; |
bungeman@google.com | cbe1b54 | 2013-12-16 17:02:39 +0000 | [diff] [blame] | 596 | } else if (((os2_table = (TT_OS2*)FT_Get_Sfnt_Table(face, ft_sfnt_os2)) != NULL) && |
| 597 | // sCapHeight is available only when version 2 or later. |
| 598 | os2_table->version != 0xFFFF && |
| 599 | os2_table->version >= 2) { |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 600 | info->fCapHeight = os2_table->sCapHeight; |
| 601 | } else { |
| 602 | // Figure out a good guess for CapHeight: average the height of M and X. |
| 603 | FT_BBox m_bbox, x_bbox; |
| 604 | bool got_m, got_x; |
| 605 | got_m = GetLetterCBox(face, 'M', &m_bbox); |
| 606 | got_x = GetLetterCBox(face, 'X', &x_bbox); |
| 607 | if (got_m && got_x) { |
| 608 | info->fCapHeight = (m_bbox.yMax - m_bbox.yMin + x_bbox.yMax - |
| 609 | x_bbox.yMin) / 2; |
| 610 | } else if (got_m && !got_x) { |
| 611 | info->fCapHeight = m_bbox.yMax - m_bbox.yMin; |
| 612 | } else if (!got_m && got_x) { |
| 613 | info->fCapHeight = x_bbox.yMax - x_bbox.yMin; |
bungeman@google.com | 12bd4a0 | 2013-12-19 19:34:22 +0000 | [diff] [blame] | 614 | } else { |
| 615 | // Last resort, use the ascent. |
| 616 | info->fCapHeight = info->fAscent; |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 617 | } |
| 618 | } |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 619 | |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 620 | info->fBBox = SkIRect::MakeLTRB(face->bbox.xMin, face->bbox.yMax, |
| 621 | face->bbox.xMax, face->bbox.yMin); |
| 622 | |
vandebo@chromium.org | 5f209e6 | 2013-12-10 17:22:41 +0000 | [diff] [blame] | 623 | if (!canEmbed(face) || !FT_IS_SCALABLE(face) || |
| 624 | info->fType == SkAdvancedTypefaceMetrics::kOther_Font) { |
vandebo@chromium.org | 325cb9a | 2011-03-30 18:36:29 +0000 | [diff] [blame] | 625 | perGlyphInfo = SkAdvancedTypefaceMetrics::kNo_PerGlyphInfo; |
| 626 | } |
| 627 | |
| 628 | if (perGlyphInfo & SkAdvancedTypefaceMetrics::kHAdvance_PerGlyphInfo) { |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 629 | if (FT_IS_FIXED_WIDTH(face)) { |
| 630 | appendRange(&info->fGlyphWidths, 0); |
| 631 | int16_t advance = face->max_advance_width; |
| 632 | info->fGlyphWidths->fAdvance.append(1, &advance); |
| 633 | finishRange(info->fGlyphWidths.get(), 0, |
| 634 | SkAdvancedTypefaceMetrics::WidthRange::kDefault); |
vandebo@chromium.org | 6f72d1e | 2011-02-14 23:19:59 +0000 | [diff] [blame] | 635 | } else if (!cid) { |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 636 | appendRange(&info->fGlyphWidths, 0); |
| 637 | // So as to not blow out the stack, get advances in batches. |
| 638 | for (int gID = 0; gID < face->num_glyphs; gID += 128) { |
| 639 | FT_Fixed advances[128]; |
| 640 | int advanceCount = 128; |
| 641 | if (gID + advanceCount > face->num_glyphs) |
bungeman@google.com | b8aa4dd | 2013-10-15 18:50:00 +0000 | [diff] [blame] | 642 | advanceCount = face->num_glyphs - gID; |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 643 | getAdvances(face, gID, advanceCount, FT_LOAD_NO_SCALE, |
| 644 | advances); |
| 645 | for (int i = 0; i < advanceCount; i++) { |
vandebo@chromium.org | ce8a195 | 2012-10-22 20:09:31 +0000 | [diff] [blame] | 646 | int16_t advance = advances[i]; |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 647 | info->fGlyphWidths->fAdvance.append(1, &advance); |
| 648 | } |
| 649 | } |
| 650 | finishRange(info->fGlyphWidths.get(), face->num_glyphs - 1, |
| 651 | SkAdvancedTypefaceMetrics::WidthRange::kRange); |
| 652 | } else { |
vandebo@chromium.org | 6f72d1e | 2011-02-14 23:19:59 +0000 | [diff] [blame] | 653 | info->fGlyphWidths.reset( |
vandebo@chromium.org | 37ad8fb | 2011-08-18 02:38:50 +0000 | [diff] [blame] | 654 | getAdvanceData(face, |
| 655 | face->num_glyphs, |
| 656 | glyphIDs, |
| 657 | glyphIDsCount, |
| 658 | &getWidthAdvance)); |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 659 | } |
vandebo@chromium.org | 325cb9a | 2011-03-30 18:36:29 +0000 | [diff] [blame] | 660 | } |
vandebo@chromium.org | c48b2b3 | 2011-02-02 02:11:22 +0000 | [diff] [blame] | 661 | |
vandebo@chromium.org | 325cb9a | 2011-03-30 18:36:29 +0000 | [diff] [blame] | 662 | if (perGlyphInfo & SkAdvancedTypefaceMetrics::kVAdvance_PerGlyphInfo && |
| 663 | FT_HAS_VERTICAL(face)) { |
| 664 | SkASSERT(false); // Not implemented yet. |
| 665 | } |
| 666 | |
| 667 | if (perGlyphInfo & SkAdvancedTypefaceMetrics::kGlyphNames_PerGlyphInfo && |
| 668 | info->fType == SkAdvancedTypefaceMetrics::kType1_Font) { |
| 669 | // Postscript fonts may contain more than 255 glyphs, so we end up |
| 670 | // using multiple font descriptions with a glyph ordering. Record |
| 671 | // the name of each glyph. |
| 672 | info->fGlyphNames.reset( |
| 673 | new SkAutoTArray<SkString>(face->num_glyphs)); |
| 674 | for (int gID = 0; gID < face->num_glyphs; gID++) { |
| 675 | char glyphName[128]; // PS limit for names is 127 bytes. |
| 676 | FT_Get_Glyph_Name(face, gID, glyphName, 128); |
| 677 | info->fGlyphNames->get()[gID].set(glyphName); |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 678 | } |
| 679 | } |
| 680 | |
vandebo@chromium.org | 6744d49 | 2011-05-09 18:13:47 +0000 | [diff] [blame] | 681 | if (perGlyphInfo & SkAdvancedTypefaceMetrics::kToUnicode_PerGlyphInfo && |
| 682 | info->fType != SkAdvancedTypefaceMetrics::kType1_Font && |
| 683 | face->num_charmaps) { |
| 684 | populate_glyph_to_unicode(face, &(info->fGlyphToUnicode)); |
| 685 | } |
| 686 | |
vandebo@chromium.org | 5f209e6 | 2013-12-10 17:22:41 +0000 | [diff] [blame] | 687 | if (!canEmbed(face)) |
| 688 | info->fType = SkAdvancedTypefaceMetrics::kNotEmbeddable_Font; |
| 689 | |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 690 | return info; |
reed@google.com | 8a5d692 | 2011-03-14 15:08:03 +0000 | [diff] [blame] | 691 | #endif |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 692 | } |
vandebo@chromium.org | 37ad8fb | 2011-08-18 02:38:50 +0000 | [diff] [blame] | 693 | |
reed@google.com | 618ef5e | 2011-01-26 22:10:41 +0000 | [diff] [blame] | 694 | /////////////////////////////////////////////////////////////////////////// |
| 695 | |
reed@google.com | ffe49f5 | 2011-11-22 19:42:41 +0000 | [diff] [blame] | 696 | #define BLACK_LUMINANCE_LIMIT 0x40 |
| 697 | #define WHITE_LUMINANCE_LIMIT 0xA0 |
| 698 | |
reed@google.com | 8ed436c | 2011-07-21 14:12:36 +0000 | [diff] [blame] | 699 | static bool bothZero(SkScalar a, SkScalar b) { |
| 700 | return 0 == a && 0 == b; |
| 701 | } |
| 702 | |
| 703 | // returns false if there is any non-90-rotation or skew |
| 704 | static bool isAxisAligned(const SkScalerContext::Rec& rec) { |
| 705 | return 0 == rec.fPreSkewX && |
| 706 | (bothZero(rec.fPost2x2[0][1], rec.fPost2x2[1][0]) || |
| 707 | bothZero(rec.fPost2x2[0][0], rec.fPost2x2[1][1])); |
| 708 | } |
| 709 | |
reed@google.com | 0da4861 | 2013-03-19 16:06:52 +0000 | [diff] [blame] | 710 | SkScalerContext* SkTypeface_FreeType::onCreateScalerContext( |
| 711 | const SkDescriptor* desc) const { |
| 712 | SkScalerContext_FreeType* c = SkNEW_ARGS(SkScalerContext_FreeType, |
| 713 | (const_cast<SkTypeface_FreeType*>(this), |
| 714 | desc)); |
| 715 | if (!c->success()) { |
| 716 | SkDELETE(c); |
| 717 | c = NULL; |
| 718 | } |
| 719 | return c; |
| 720 | } |
| 721 | |
| 722 | void SkTypeface_FreeType::onFilterRec(SkScalerContextRec* rec) const { |
bungeman@google.com | 8cf3226 | 2012-04-02 14:34:30 +0000 | [diff] [blame] | 723 | //BOGUS: http://code.google.com/p/chromium/issues/detail?id=121119 |
| 724 | //Cap the requested size as larger sizes give bogus values. |
| 725 | //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] | 726 | if (rec->fTextSize > SkIntToScalar(1 << 14)) { |
scroggo@google.com | 94bc60f | 2012-10-04 20:45:06 +0000 | [diff] [blame] | 727 | rec->fTextSize = SkIntToScalar(1 << 14); |
bungeman@google.com | 8cf3226 | 2012-04-02 14:34:30 +0000 | [diff] [blame] | 728 | } |
skia.committer@gmail.com | a27096b | 2012-08-30 14:38:00 +0000 | [diff] [blame] | 729 | |
reed@google.com | fb2fdcc | 2012-10-17 15:49:36 +0000 | [diff] [blame] | 730 | if (!is_lcd_supported() && isLCD(*rec)) { |
reed@google.com | 618ef5e | 2011-01-26 22:10:41 +0000 | [diff] [blame] | 731 | // If the runtime Freetype library doesn't support LCD mode, we disable |
| 732 | // it here. |
| 733 | rec->fMaskFormat = SkMask::kA8_Format; |
| 734 | } |
reed@google.com | 5b31b0f | 2011-02-23 14:41:42 +0000 | [diff] [blame] | 735 | |
reed@google.com | 618ef5e | 2011-01-26 22:10:41 +0000 | [diff] [blame] | 736 | SkPaint::Hinting h = rec->getHinting(); |
reed@google.com | effc501 | 2011-06-27 16:44:46 +0000 | [diff] [blame] | 737 | if (SkPaint::kFull_Hinting == h && !isLCD(*rec)) { |
reed@google.com | 618ef5e | 2011-01-26 22:10:41 +0000 | [diff] [blame] | 738 | // collapse full->normal hinting if we're not doing LCD |
| 739 | h = SkPaint::kNormal_Hinting; |
reed@google.com | 618ef5e | 2011-01-26 22:10:41 +0000 | [diff] [blame] | 740 | } |
bungeman@google.com | f4f2b80 | 2012-03-08 19:19:51 +0000 | [diff] [blame] | 741 | if ((rec->fFlags & SkScalerContext::kSubpixelPositioning_Flag)) { |
reed@google.com | 1ac8350 | 2012-02-28 17:06:02 +0000 | [diff] [blame] | 742 | if (SkPaint::kNo_Hinting != h) { |
| 743 | h = SkPaint::kSlight_Hinting; |
| 744 | } |
| 745 | } |
| 746 | |
reed@google.com | 8ed436c | 2011-07-21 14:12:36 +0000 | [diff] [blame] | 747 | // rotated text looks bad with hinting, so we disable it as needed |
| 748 | if (!isAxisAligned(*rec)) { |
| 749 | h = SkPaint::kNo_Hinting; |
| 750 | } |
reed@google.com | 618ef5e | 2011-01-26 22:10:41 +0000 | [diff] [blame] | 751 | rec->setHinting(h); |
reed@google.com | ffe49f5 | 2011-11-22 19:42:41 +0000 | [diff] [blame] | 752 | |
bungeman@google.com | 97efada | 2012-07-30 20:40:50 +0000 | [diff] [blame] | 753 | #ifndef SK_GAMMA_APPLY_TO_A8 |
| 754 | if (!isLCD(*rec)) { |
| 755 | rec->ignorePreBlend(); |
reed@google.com | ffe49f5 | 2011-11-22 19:42:41 +0000 | [diff] [blame] | 756 | } |
reed@google.com | 1ac8350 | 2012-02-28 17:06:02 +0000 | [diff] [blame] | 757 | #endif |
reed@google.com | 618ef5e | 2011-01-26 22:10:41 +0000 | [diff] [blame] | 758 | } |
vandebo@chromium.org | 2a22e10 | 2011-01-25 21:01:34 +0000 | [diff] [blame] | 759 | |
reed@google.com | 38c37dd | 2013-03-21 15:36:26 +0000 | [diff] [blame] | 760 | int SkTypeface_FreeType::onGetUPEM() const { |
reed@google.com | b4162b1 | 2013-07-02 16:32:29 +0000 | [diff] [blame] | 761 | AutoFTAccess fta(this); |
| 762 | FT_Face face = fta.face(); |
| 763 | return face ? face->units_per_EM : 0; |
djsollen@google.com | cd9d69b | 2011-03-14 20:30:14 +0000 | [diff] [blame] | 764 | } |
djsollen@google.com | cd9d69b | 2011-03-14 20:30:14 +0000 | [diff] [blame] | 765 | |
reed@google.com | 35fe737 | 2013-10-30 15:07:03 +0000 | [diff] [blame] | 766 | bool SkTypeface_FreeType::onGetKerningPairAdjustments(const uint16_t glyphs[], |
| 767 | int count, int32_t adjustments[]) const { |
| 768 | AutoFTAccess fta(this); |
| 769 | FT_Face face = fta.face(); |
| 770 | if (!face || !FT_HAS_KERNING(face)) { |
| 771 | return false; |
| 772 | } |
| 773 | |
| 774 | for (int i = 0; i < count - 1; ++i) { |
| 775 | FT_Vector delta; |
| 776 | FT_Error err = FT_Get_Kerning(face, glyphs[i], glyphs[i+1], |
| 777 | FT_KERNING_UNSCALED, &delta); |
| 778 | if (err) { |
| 779 | return false; |
| 780 | } |
| 781 | adjustments[i] = delta.x; |
| 782 | } |
| 783 | return true; |
| 784 | } |
| 785 | |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 786 | static FT_Int chooseBitmapStrike(FT_Face face, SkFixed scaleY) { |
| 787 | // early out if face is bad |
| 788 | if (face == NULL) { |
| 789 | SkDEBUGF(("chooseBitmapStrike aborted due to NULL face\n")); |
| 790 | return -1; |
| 791 | } |
| 792 | // determine target ppem |
| 793 | FT_Pos targetPPEM = SkFixedToFDot6(scaleY); |
| 794 | // find a bitmap strike equal to or just larger than the requested size |
| 795 | FT_Int chosenStrikeIndex = -1; |
| 796 | FT_Pos chosenPPEM = 0; |
| 797 | for (FT_Int strikeIndex = 0; strikeIndex < face->num_fixed_sizes; ++strikeIndex) { |
| 798 | FT_Pos thisPPEM = face->available_sizes[strikeIndex].y_ppem; |
| 799 | if (thisPPEM == targetPPEM) { |
| 800 | // exact match - our search stops here |
| 801 | chosenPPEM = thisPPEM; |
| 802 | chosenStrikeIndex = strikeIndex; |
| 803 | break; |
| 804 | } else if (chosenPPEM < targetPPEM) { |
| 805 | // attempt to increase chosenPPEM |
| 806 | if (thisPPEM > chosenPPEM) { |
| 807 | chosenPPEM = thisPPEM; |
| 808 | chosenStrikeIndex = strikeIndex; |
| 809 | } |
| 810 | } else { |
| 811 | // attempt to decrease chosenPPEM, but not below targetPPEM |
| 812 | if (thisPPEM < chosenPPEM && thisPPEM > targetPPEM) { |
| 813 | chosenPPEM = thisPPEM; |
| 814 | chosenStrikeIndex = strikeIndex; |
| 815 | } |
| 816 | } |
| 817 | } |
| 818 | if (chosenStrikeIndex != -1) { |
| 819 | // use the chosen strike |
| 820 | FT_Error err = FT_Select_Size(face, chosenStrikeIndex); |
| 821 | if (err != 0) { |
| 822 | SkDEBUGF(("FT_Select_Size(%s, %d) returned 0x%x\n", face->family_name, |
| 823 | chosenStrikeIndex, err)); |
| 824 | chosenStrikeIndex = -1; |
| 825 | } |
| 826 | } |
| 827 | return chosenStrikeIndex; |
| 828 | } |
| 829 | |
reed@google.com | 0da4861 | 2013-03-19 16:06:52 +0000 | [diff] [blame] | 830 | SkScalerContext_FreeType::SkScalerContext_FreeType(SkTypeface* typeface, |
| 831 | const SkDescriptor* desc) |
| 832 | : SkScalerContext_FreeType_Base(typeface, desc) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 833 | SkAutoMutexAcquire ac(gFTMutex); |
| 834 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 835 | if (gFTCount == 0) { |
reed@android.com | 659aaf9 | 2009-07-23 15:20:21 +0000 | [diff] [blame] | 836 | if (!InitFreetype()) { |
| 837 | sk_throw(); |
| 838 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 839 | } |
| 840 | ++gFTCount; |
| 841 | |
| 842 | // load the font file |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 843 | fStrikeIndex = -1; |
reed@android.com | 62900b4 | 2009-02-11 15:07:19 +0000 | [diff] [blame] | 844 | fFTSize = NULL; |
| 845 | fFace = NULL; |
reed@google.com | 2cdc671 | 2013-03-21 18:22:00 +0000 | [diff] [blame] | 846 | fFaceRec = ref_ft_face(typeface); |
reed@android.com | 62900b4 | 2009-02-11 15:07:19 +0000 | [diff] [blame] | 847 | if (NULL == fFaceRec) { |
| 848 | return; |
| 849 | } |
| 850 | fFace = fFaceRec->fFace; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 851 | |
| 852 | // compute our factors from the record |
| 853 | |
| 854 | SkMatrix m; |
| 855 | |
| 856 | fRec.getSingleMatrix(&m); |
| 857 | |
| 858 | #ifdef DUMP_STRIKE_CREATION |
| 859 | SkString keyString; |
| 860 | SkFontHost::GetDescriptorKeyString(desc, &keyString); |
| 861 | printf("========== strike [%g %g %g] [%g %g %g %g] hints %d format %d %s\n", SkScalarToFloat(fRec.fTextSize), |
| 862 | SkScalarToFloat(fRec.fPreScaleX), SkScalarToFloat(fRec.fPreSkewX), |
| 863 | SkScalarToFloat(fRec.fPost2x2[0][0]), SkScalarToFloat(fRec.fPost2x2[0][1]), |
| 864 | SkScalarToFloat(fRec.fPost2x2[1][0]), SkScalarToFloat(fRec.fPost2x2[1][1]), |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame] | 865 | fRec.getHinting(), fRec.fMaskFormat, keyString.c_str()); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 866 | #endif |
| 867 | |
| 868 | // now compute our scale factors |
| 869 | SkScalar sx = m.getScaleX(); |
| 870 | SkScalar sy = m.getScaleY(); |
| 871 | |
reed@google.com | f073b33 | 2013-05-06 12:21:16 +0000 | [diff] [blame] | 872 | fMatrix22Scalar.reset(); |
| 873 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 874 | if (m.getSkewX() || m.getSkewY() || sx < 0 || sy < 0) { |
| 875 | // sort of give up on hinting |
| 876 | sx = SkMaxScalar(SkScalarAbs(sx), SkScalarAbs(m.getSkewX())); |
| 877 | sy = SkMaxScalar(SkScalarAbs(m.getSkewY()), SkScalarAbs(sy)); |
| 878 | sx = sy = SkScalarAve(sx, sy); |
| 879 | |
| 880 | SkScalar inv = SkScalarInvert(sx); |
| 881 | |
| 882 | // flip the skew elements to go from our Y-down system to FreeType's |
| 883 | fMatrix22.xx = SkScalarToFixed(SkScalarMul(m.getScaleX(), inv)); |
| 884 | fMatrix22.xy = -SkScalarToFixed(SkScalarMul(m.getSkewX(), inv)); |
| 885 | fMatrix22.yx = -SkScalarToFixed(SkScalarMul(m.getSkewY(), inv)); |
| 886 | fMatrix22.yy = SkScalarToFixed(SkScalarMul(m.getScaleY(), inv)); |
skia.committer@gmail.com | e944de7 | 2013-05-07 07:01:03 +0000 | [diff] [blame] | 887 | |
reed@google.com | f073b33 | 2013-05-06 12:21:16 +0000 | [diff] [blame] | 888 | fMatrix22Scalar.setScaleX(SkScalarMul(m.getScaleX(), inv)); |
| 889 | fMatrix22Scalar.setSkewX(-SkScalarMul(m.getSkewX(), inv)); |
| 890 | fMatrix22Scalar.setSkewY(-SkScalarMul(m.getSkewY(), inv)); |
| 891 | fMatrix22Scalar.setScaleY(SkScalarMul(m.getScaleY(), inv)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 892 | } else { |
| 893 | fMatrix22.xx = fMatrix22.yy = SK_Fixed1; |
| 894 | fMatrix22.xy = fMatrix22.yx = 0; |
| 895 | } |
reed@google.com | f073b33 | 2013-05-06 12:21:16 +0000 | [diff] [blame] | 896 | fScale.set(sx, sy); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 897 | fScaleX = SkScalarToFixed(sx); |
| 898 | fScaleY = SkScalarToFixed(sy); |
| 899 | |
reed@google.com | a1bfa21 | 2012-03-08 21:57:12 +0000 | [diff] [blame] | 900 | fLCDIsVert = SkToBool(fRec.fFlags & SkScalerContext::kLCD_Vertical_Flag); |
| 901 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 902 | // compute the flags we send to Load_Glyph |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 903 | bool linearMetrics = SkToBool(fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 904 | { |
reed@android.com | e4d0bc0 | 2009-07-24 19:53:20 +0000 | [diff] [blame] | 905 | FT_Int32 loadFlags = FT_LOAD_DEFAULT; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 906 | |
agl@chromium.org | 70a303f | 2010-05-10 14:15:50 +0000 | [diff] [blame] | 907 | if (SkMask::kBW_Format == fRec.fMaskFormat) { |
| 908 | // See http://code.google.com/p/chromium/issues/detail?id=43252#c24 |
| 909 | loadFlags = FT_LOAD_TARGET_MONO; |
reed@google.com | effc501 | 2011-06-27 16:44:46 +0000 | [diff] [blame] | 910 | if (fRec.getHinting() == SkPaint::kNo_Hinting) { |
agl@chromium.org | 70a303f | 2010-05-10 14:15:50 +0000 | [diff] [blame] | 911 | loadFlags = FT_LOAD_NO_HINTING; |
reed@google.com | bdc9988 | 2011-11-21 14:36:57 +0000 | [diff] [blame] | 912 | linearMetrics = true; |
reed@google.com | effc501 | 2011-06-27 16:44:46 +0000 | [diff] [blame] | 913 | } |
agl@chromium.org | 70a303f | 2010-05-10 14:15:50 +0000 | [diff] [blame] | 914 | } else { |
| 915 | switch (fRec.getHinting()) { |
| 916 | case SkPaint::kNo_Hinting: |
| 917 | loadFlags = FT_LOAD_NO_HINTING; |
reed@google.com | bdc9988 | 2011-11-21 14:36:57 +0000 | [diff] [blame] | 918 | linearMetrics = true; |
agl@chromium.org | 70a303f | 2010-05-10 14:15:50 +0000 | [diff] [blame] | 919 | break; |
| 920 | case SkPaint::kSlight_Hinting: |
| 921 | loadFlags = FT_LOAD_TARGET_LIGHT; // This implies FORCE_AUTOHINT |
| 922 | break; |
| 923 | case SkPaint::kNormal_Hinting: |
bungeman@google.com | f6f5687 | 2014-01-23 19:01:36 +0000 | [diff] [blame] | 924 | if (fRec.fFlags & SkScalerContext::kForceAutohinting_Flag) { |
agl@chromium.org | a2c71cb | 2010-06-17 20:49:17 +0000 | [diff] [blame] | 925 | loadFlags = FT_LOAD_FORCE_AUTOHINT; |
bungeman@google.com | f6f5687 | 2014-01-23 19:01:36 +0000 | [diff] [blame] | 926 | } |
agl@chromium.org | 70a303f | 2010-05-10 14:15:50 +0000 | [diff] [blame] | 927 | break; |
| 928 | case SkPaint::kFull_Hinting: |
bungeman@google.com | f6f5687 | 2014-01-23 19:01:36 +0000 | [diff] [blame] | 929 | if (fRec.fFlags & SkScalerContext::kForceAutohinting_Flag) { |
agl@chromium.org | a2c71cb | 2010-06-17 20:49:17 +0000 | [diff] [blame] | 930 | loadFlags = FT_LOAD_FORCE_AUTOHINT; |
| 931 | break; |
| 932 | } |
agl@chromium.org | 70a303f | 2010-05-10 14:15:50 +0000 | [diff] [blame] | 933 | loadFlags = FT_LOAD_TARGET_NORMAL; |
reed@google.com | effc501 | 2011-06-27 16:44:46 +0000 | [diff] [blame] | 934 | if (isLCD(fRec)) { |
reed@google.com | a1bfa21 | 2012-03-08 21:57:12 +0000 | [diff] [blame] | 935 | if (fLCDIsVert) { |
reed@google.com | effc501 | 2011-06-27 16:44:46 +0000 | [diff] [blame] | 936 | loadFlags = FT_LOAD_TARGET_LCD_V; |
| 937 | } else { |
| 938 | loadFlags = FT_LOAD_TARGET_LCD; |
| 939 | } |
reed@google.com | ea2333d | 2011-03-14 16:44:56 +0000 | [diff] [blame] | 940 | } |
agl@chromium.org | 70a303f | 2010-05-10 14:15:50 +0000 | [diff] [blame] | 941 | break; |
| 942 | default: |
| 943 | SkDebugf("---------- UNKNOWN hinting %d\n", fRec.getHinting()); |
| 944 | break; |
| 945 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 946 | } |
| 947 | |
reed@google.com | effc501 | 2011-06-27 16:44:46 +0000 | [diff] [blame] | 948 | if ((fRec.fFlags & SkScalerContext::kEmbeddedBitmapText_Flag) == 0) { |
agl@chromium.org | e0d0899 | 2009-08-07 19:19:23 +0000 | [diff] [blame] | 949 | loadFlags |= FT_LOAD_NO_BITMAP; |
reed@google.com | effc501 | 2011-06-27 16:44:46 +0000 | [diff] [blame] | 950 | } |
agl@chromium.org | e0d0899 | 2009-08-07 19:19:23 +0000 | [diff] [blame] | 951 | |
reed@google.com | 96a9f791 | 2011-05-06 11:49:30 +0000 | [diff] [blame] | 952 | // Always using FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH to get correct |
| 953 | // advances, as fontconfig and cairo do. |
| 954 | // See http://code.google.com/p/skia/issues/detail?id=222. |
| 955 | loadFlags |= FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH; |
| 956 | |
bungeman@google.com | 8ff8a19 | 2012-09-25 20:38:28 +0000 | [diff] [blame] | 957 | // Use vertical layout if requested. |
| 958 | if (fRec.fFlags & SkScalerContext::kVertical_Flag) { |
| 959 | loadFlags |= FT_LOAD_VERTICAL_LAYOUT; |
| 960 | } |
| 961 | |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 962 | loadFlags |= FT_LOAD_COLOR; |
| 963 | |
reed@android.com | e4d0bc0 | 2009-07-24 19:53:20 +0000 | [diff] [blame] | 964 | fLoadGlyphFlags = loadFlags; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 965 | } |
| 966 | |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 967 | FT_Error err = FT_New_Size(fFace, &fFTSize); |
| 968 | if (err != 0) { |
| 969 | SkDEBUGF(("FT_New_Size returned %x for face %s\n", err, fFace->family_name)); |
| 970 | fFace = NULL; |
| 971 | return; |
| 972 | } |
| 973 | err = FT_Activate_Size(fFTSize); |
| 974 | if (err != 0) { |
| 975 | SkDEBUGF(("FT_Activate_Size(%08x, 0x%x, 0x%x) returned 0x%x\n", fFace, fScaleX, fScaleY, |
| 976 | err)); |
| 977 | fFTSize = NULL; |
| 978 | return; |
| 979 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 980 | |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 981 | if (FT_IS_SCALABLE(fFace)) { |
| 982 | err = FT_Set_Char_Size(fFace, SkFixedToFDot6(fScaleX), SkFixedToFDot6(fScaleY), 72, 72); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 983 | if (err != 0) { |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 984 | SkDEBUGF(("FT_Set_CharSize(%08x, 0x%x, 0x%x) returned 0x%x\n", |
| 985 | fFace, fScaleX, fScaleY, err)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 986 | fFace = NULL; |
| 987 | return; |
| 988 | } |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 989 | FT_Set_Transform(fFace, &fMatrix22, NULL); |
| 990 | } else if (FT_HAS_FIXED_SIZES(fFace)) { |
| 991 | fStrikeIndex = chooseBitmapStrike(fFace, fScaleY); |
| 992 | if (fStrikeIndex == -1) { |
| 993 | SkDEBUGF(("no glyphs for font \"%s\" size %f?\n", |
| 994 | fFace->family_name, SkFixedToScalar(fScaleY))); |
| 995 | } else { |
| 996 | // FreeType does no provide linear metrics for bitmap fonts. |
| 997 | linearMetrics = false; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 998 | |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 999 | // FreeType documentation says: |
| 1000 | // FT_LOAD_NO_BITMAP -- Ignore bitmap strikes when loading. |
| 1001 | // Bitmap-only fonts ignore this flag. |
| 1002 | // |
| 1003 | // However, in FreeType 2.5.1 color bitmap only fonts do not ignore this flag. |
| 1004 | // Force this flag off for bitmap only fonts. |
| 1005 | fLoadGlyphFlags &= ~FT_LOAD_NO_BITMAP; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1006 | } |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 1007 | } else { |
| 1008 | SkDEBUGF(("unknown kind of font \"%s\" size %f?\n", |
| 1009 | fFace->family_name, SkFixedToScalar(fScaleY))); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1010 | } |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 1011 | |
| 1012 | fDoLinearMetrics = linearMetrics; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1013 | } |
| 1014 | |
| 1015 | SkScalerContext_FreeType::~SkScalerContext_FreeType() { |
scroggo@google.com | 94bc60f | 2012-10-04 20:45:06 +0000 | [diff] [blame] | 1016 | SkAutoMutexAcquire ac(gFTMutex); |
| 1017 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1018 | if (fFTSize != NULL) { |
| 1019 | FT_Done_Size(fFTSize); |
| 1020 | } |
| 1021 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1022 | if (fFace != NULL) { |
| 1023 | unref_ft_face(fFace); |
| 1024 | } |
| 1025 | if (--gFTCount == 0) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1026 | FT_Done_FreeType(gFTLibrary); |
| 1027 | SkDEBUGCODE(gFTLibrary = NULL;) |
| 1028 | } |
| 1029 | } |
| 1030 | |
| 1031 | /* We call this before each use of the fFace, since we may be sharing |
| 1032 | this face with other context (at different sizes). |
| 1033 | */ |
| 1034 | FT_Error SkScalerContext_FreeType::setupSize() { |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 1035 | FT_Error err = FT_Activate_Size(fFTSize); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1036 | if (err != 0) { |
| 1037 | SkDEBUGF(("SkScalerContext_FreeType::FT_Activate_Size(%x, 0x%x, 0x%x) returned 0x%x\n", |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 1038 | fFaceRec->fFontID, fScaleX, fScaleY, err)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1039 | fFTSize = NULL; |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 1040 | return err; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1041 | } |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 1042 | |
| 1043 | // seems we need to reset this every time (not sure why, but without it |
| 1044 | // I get random italics from some other fFTSize) |
| 1045 | FT_Set_Transform(fFace, &fMatrix22, NULL); |
| 1046 | return 0; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1047 | } |
| 1048 | |
ctguil@chromium.org | 0bc7bf5 | 2011-03-04 19:04:57 +0000 | [diff] [blame] | 1049 | unsigned SkScalerContext_FreeType::generateGlyphCount() { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1050 | return fFace->num_glyphs; |
| 1051 | } |
| 1052 | |
| 1053 | uint16_t SkScalerContext_FreeType::generateCharToGlyph(SkUnichar uni) { |
| 1054 | return SkToU16(FT_Get_Char_Index( fFace, uni )); |
| 1055 | } |
| 1056 | |
reed@android.com | 9d3a985 | 2010-01-08 14:07:42 +0000 | [diff] [blame] | 1057 | SkUnichar SkScalerContext_FreeType::generateGlyphToChar(uint16_t glyph) { |
| 1058 | // iterate through each cmap entry, looking for matching glyph indices |
| 1059 | FT_UInt glyphIndex; |
| 1060 | SkUnichar charCode = FT_Get_First_Char( fFace, &glyphIndex ); |
| 1061 | |
| 1062 | while (glyphIndex != 0) { |
| 1063 | if (glyphIndex == glyph) { |
| 1064 | return charCode; |
| 1065 | } |
| 1066 | charCode = FT_Get_Next_Char( fFace, charCode, &glyphIndex ); |
| 1067 | } |
| 1068 | |
| 1069 | return 0; |
| 1070 | } |
| 1071 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1072 | void SkScalerContext_FreeType::generateAdvance(SkGlyph* glyph) { |
| 1073 | #ifdef FT_ADVANCES_H |
| 1074 | /* unhinted and light hinted text have linearly scaled advances |
| 1075 | * which are very cheap to compute with some font formats... |
| 1076 | */ |
reed@google.com | bdc9988 | 2011-11-21 14:36:57 +0000 | [diff] [blame] | 1077 | if (fDoLinearMetrics) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1078 | SkAutoMutexAcquire ac(gFTMutex); |
| 1079 | |
| 1080 | if (this->setupSize()) { |
reed@android.com | 62900b4 | 2009-02-11 15:07:19 +0000 | [diff] [blame] | 1081 | glyph->zeroMetrics(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1082 | return; |
| 1083 | } |
| 1084 | |
| 1085 | FT_Error error; |
| 1086 | FT_Fixed advance; |
| 1087 | |
| 1088 | error = FT_Get_Advance( fFace, glyph->getGlyphID(fBaseGlyphCount), |
| 1089 | fLoadGlyphFlags | FT_ADVANCE_FLAG_FAST_ONLY, |
| 1090 | &advance ); |
| 1091 | if (0 == error) { |
| 1092 | glyph->fRsbDelta = 0; |
| 1093 | glyph->fLsbDelta = 0; |
reed@google.com | d074c37 | 2012-07-18 13:45:58 +0000 | [diff] [blame] | 1094 | glyph->fAdvanceX = SkFixedMul(fMatrix22.xx, advance); |
| 1095 | glyph->fAdvanceY = - SkFixedMul(fMatrix22.yx, advance); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1096 | return; |
| 1097 | } |
| 1098 | } |
| 1099 | #endif /* FT_ADVANCES_H */ |
| 1100 | /* otherwise, we need to load/hint the glyph, which is slower */ |
| 1101 | this->generateMetrics(glyph); |
| 1102 | return; |
| 1103 | } |
| 1104 | |
djsollen@google.com | d8b599c | 2012-03-19 19:44:19 +0000 | [diff] [blame] | 1105 | void SkScalerContext_FreeType::getBBoxForCurrentGlyph(SkGlyph* glyph, |
| 1106 | FT_BBox* bbox, |
| 1107 | bool snapToPixelBoundary) { |
| 1108 | |
| 1109 | FT_Outline_Get_CBox(&fFace->glyph->outline, bbox); |
| 1110 | |
| 1111 | if (fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag) { |
george@mozilla.com | c59b5da | 2012-08-23 00:39:08 +0000 | [diff] [blame] | 1112 | int dx = SkFixedToFDot6(glyph->getSubXFixed()); |
| 1113 | int dy = SkFixedToFDot6(glyph->getSubYFixed()); |
djsollen@google.com | d8b599c | 2012-03-19 19:44:19 +0000 | [diff] [blame] | 1114 | // negate dy since freetype-y-goes-up and skia-y-goes-down |
| 1115 | bbox->xMin += dx; |
| 1116 | bbox->yMin -= dy; |
| 1117 | bbox->xMax += dx; |
| 1118 | bbox->yMax -= dy; |
| 1119 | } |
| 1120 | |
| 1121 | // outset the box to integral boundaries |
| 1122 | if (snapToPixelBoundary) { |
| 1123 | bbox->xMin &= ~63; |
| 1124 | bbox->yMin &= ~63; |
| 1125 | bbox->xMax = (bbox->xMax + 63) & ~63; |
| 1126 | bbox->yMax = (bbox->yMax + 63) & ~63; |
| 1127 | } |
bungeman@google.com | 8ff8a19 | 2012-09-25 20:38:28 +0000 | [diff] [blame] | 1128 | |
| 1129 | // Must come after snapToPixelBoundary so that the width and height are |
| 1130 | // consistent. Otherwise asserts will fire later on when generating the |
| 1131 | // glyph image. |
| 1132 | if (fRec.fFlags & SkScalerContext::kVertical_Flag) { |
| 1133 | FT_Vector vector; |
| 1134 | vector.x = fFace->glyph->metrics.vertBearingX - fFace->glyph->metrics.horiBearingX; |
| 1135 | vector.y = -fFace->glyph->metrics.vertBearingY - fFace->glyph->metrics.horiBearingY; |
| 1136 | FT_Vector_Transform(&vector, &fMatrix22); |
| 1137 | bbox->xMin += vector.x; |
| 1138 | bbox->xMax += vector.x; |
| 1139 | bbox->yMin += vector.y; |
| 1140 | bbox->yMax += vector.y; |
| 1141 | } |
djsollen@google.com | d8b599c | 2012-03-19 19:44:19 +0000 | [diff] [blame] | 1142 | } |
| 1143 | |
bungeman@google.com | cbe1b54 | 2013-12-16 17:02:39 +0000 | [diff] [blame] | 1144 | bool SkScalerContext_FreeType::getCBoxForLetter(char letter, FT_BBox* bbox) { |
| 1145 | const FT_UInt glyph_id = FT_Get_Char_Index(fFace, letter); |
| 1146 | if (!glyph_id) |
| 1147 | return false; |
| 1148 | if (FT_Load_Glyph(fFace, glyph_id, fLoadGlyphFlags) != 0) |
| 1149 | return false; |
commit-bot@chromium.org | 6fa81d7 | 2013-12-26 15:50:29 +0000 | [diff] [blame] | 1150 | emboldenIfNeeded(fFace, fFace->glyph); |
bungeman@google.com | cbe1b54 | 2013-12-16 17:02:39 +0000 | [diff] [blame] | 1151 | FT_Outline_Get_CBox(&fFace->glyph->outline, bbox); |
| 1152 | return true; |
| 1153 | } |
| 1154 | |
djsollen@google.com | d8b599c | 2012-03-19 19:44:19 +0000 | [diff] [blame] | 1155 | void SkScalerContext_FreeType::updateGlyphIfLCD(SkGlyph* glyph) { |
| 1156 | if (isLCD(fRec)) { |
| 1157 | if (fLCDIsVert) { |
| 1158 | glyph->fHeight += gLCDExtra; |
| 1159 | glyph->fTop -= gLCDExtra >> 1; |
| 1160 | } else { |
| 1161 | glyph->fWidth += gLCDExtra; |
| 1162 | glyph->fLeft -= gLCDExtra >> 1; |
| 1163 | } |
| 1164 | } |
| 1165 | } |
| 1166 | |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 1167 | inline void scaleGlyphMetrics(SkGlyph& glyph, SkScalar scale) { |
| 1168 | glyph.fWidth *= scale; |
| 1169 | glyph.fHeight *= scale; |
| 1170 | glyph.fTop *= scale; |
| 1171 | glyph.fLeft *= scale; |
| 1172 | |
| 1173 | SkFixed fixedScale = SkScalarToFixed(scale); |
| 1174 | glyph.fAdvanceX = SkFixedMul(glyph.fAdvanceX, fixedScale); |
| 1175 | glyph.fAdvanceY = SkFixedMul(glyph.fAdvanceY, fixedScale); |
| 1176 | } |
| 1177 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1178 | void SkScalerContext_FreeType::generateMetrics(SkGlyph* glyph) { |
| 1179 | SkAutoMutexAcquire ac(gFTMutex); |
| 1180 | |
| 1181 | glyph->fRsbDelta = 0; |
| 1182 | glyph->fLsbDelta = 0; |
| 1183 | |
| 1184 | FT_Error err; |
| 1185 | |
| 1186 | if (this->setupSize()) { |
| 1187 | goto ERROR; |
| 1188 | } |
| 1189 | |
| 1190 | err = FT_Load_Glyph( fFace, glyph->getGlyphID(fBaseGlyphCount), fLoadGlyphFlags ); |
| 1191 | if (err != 0) { |
mike@reedtribe.org | 7a722f0 | 2012-11-15 02:12:14 +0000 | [diff] [blame] | 1192 | #if 0 |
| 1193 | SkDEBUGF(("SkScalerContext_FreeType::generateMetrics(%x): FT_Load_Glyph(glyph:%d flags:%x) returned 0x%x\n", |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1194 | fFaceRec->fFontID, glyph->getGlyphID(fBaseGlyphCount), fLoadGlyphFlags, err)); |
mike@reedtribe.org | 7a722f0 | 2012-11-15 02:12:14 +0000 | [diff] [blame] | 1195 | #endif |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1196 | ERROR: |
reed@android.com | 62900b4 | 2009-02-11 15:07:19 +0000 | [diff] [blame] | 1197 | glyph->zeroMetrics(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1198 | return; |
| 1199 | } |
commit-bot@chromium.org | 6fa81d7 | 2013-12-26 15:50:29 +0000 | [diff] [blame] | 1200 | emboldenIfNeeded(fFace, fFace->glyph); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1201 | |
| 1202 | switch ( fFace->glyph->format ) { |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 1203 | case FT_GLYPH_FORMAT_OUTLINE: |
bungeman@google.com | 0f0c288 | 2011-11-04 15:47:41 +0000 | [diff] [blame] | 1204 | if (0 == fFace->glyph->outline.n_contours) { |
| 1205 | glyph->fWidth = 0; |
| 1206 | glyph->fHeight = 0; |
| 1207 | glyph->fTop = 0; |
| 1208 | glyph->fLeft = 0; |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 1209 | } else { |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 1210 | FT_BBox bbox; |
| 1211 | getBBoxForCurrentGlyph(glyph, &bbox, true); |
| 1212 | |
| 1213 | glyph->fWidth = SkToU16(SkFDot6Floor(bbox.xMax - bbox.xMin)); |
| 1214 | glyph->fHeight = SkToU16(SkFDot6Floor(bbox.yMax - bbox.yMin)); |
| 1215 | glyph->fTop = -SkToS16(SkFDot6Floor(bbox.yMax)); |
| 1216 | glyph->fLeft = SkToS16(SkFDot6Floor(bbox.xMin)); |
| 1217 | |
| 1218 | updateGlyphIfLCD(glyph); |
bungeman@google.com | 0f0c288 | 2011-11-04 15:47:41 +0000 | [diff] [blame] | 1219 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1220 | break; |
| 1221 | |
| 1222 | case FT_GLYPH_FORMAT_BITMAP: |
bungeman@google.com | 8ff8a19 | 2012-09-25 20:38:28 +0000 | [diff] [blame] | 1223 | if (fRec.fFlags & SkScalerContext::kVertical_Flag) { |
| 1224 | FT_Vector vector; |
| 1225 | vector.x = fFace->glyph->metrics.vertBearingX - fFace->glyph->metrics.horiBearingX; |
| 1226 | vector.y = -fFace->glyph->metrics.vertBearingY - fFace->glyph->metrics.horiBearingY; |
| 1227 | FT_Vector_Transform(&vector, &fMatrix22); |
| 1228 | fFace->glyph->bitmap_left += SkFDot6Floor(vector.x); |
| 1229 | fFace->glyph->bitmap_top += SkFDot6Floor(vector.y); |
| 1230 | } |
| 1231 | |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 1232 | if (fFace->glyph->bitmap.pixel_mode == FT_PIXEL_MODE_BGRA) { |
| 1233 | glyph->fMaskFormat = SkMask::kARGB32_Format; |
| 1234 | } |
| 1235 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1236 | glyph->fWidth = SkToU16(fFace->glyph->bitmap.width); |
| 1237 | glyph->fHeight = SkToU16(fFace->glyph->bitmap.rows); |
| 1238 | glyph->fTop = -SkToS16(fFace->glyph->bitmap_top); |
| 1239 | glyph->fLeft = SkToS16(fFace->glyph->bitmap_left); |
| 1240 | break; |
| 1241 | |
| 1242 | default: |
tomhudson@google.com | 0c00f21 | 2011-12-28 14:59:50 +0000 | [diff] [blame] | 1243 | SkDEBUGFAIL("unknown glyph format"); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1244 | goto ERROR; |
| 1245 | } |
| 1246 | |
bungeman@google.com | 8ff8a19 | 2012-09-25 20:38:28 +0000 | [diff] [blame] | 1247 | if (fRec.fFlags & SkScalerContext::kVertical_Flag) { |
| 1248 | if (fDoLinearMetrics) { |
| 1249 | glyph->fAdvanceX = -SkFixedMul(fMatrix22.xy, fFace->glyph->linearVertAdvance); |
| 1250 | glyph->fAdvanceY = SkFixedMul(fMatrix22.yy, fFace->glyph->linearVertAdvance); |
| 1251 | } else { |
| 1252 | glyph->fAdvanceX = -SkFDot6ToFixed(fFace->glyph->advance.x); |
| 1253 | glyph->fAdvanceY = SkFDot6ToFixed(fFace->glyph->advance.y); |
| 1254 | } |
bungeman@google.com | 34f1026 | 2012-03-23 18:11:47 +0000 | [diff] [blame] | 1255 | } else { |
bungeman@google.com | 8ff8a19 | 2012-09-25 20:38:28 +0000 | [diff] [blame] | 1256 | if (fDoLinearMetrics) { |
| 1257 | glyph->fAdvanceX = SkFixedMul(fMatrix22.xx, fFace->glyph->linearHoriAdvance); |
| 1258 | glyph->fAdvanceY = -SkFixedMul(fMatrix22.yx, fFace->glyph->linearHoriAdvance); |
| 1259 | } else { |
| 1260 | glyph->fAdvanceX = SkFDot6ToFixed(fFace->glyph->advance.x); |
| 1261 | glyph->fAdvanceY = -SkFDot6ToFixed(fFace->glyph->advance.y); |
bungeman@google.com | 34f1026 | 2012-03-23 18:11:47 +0000 | [diff] [blame] | 1262 | |
bungeman@google.com | 8ff8a19 | 2012-09-25 20:38:28 +0000 | [diff] [blame] | 1263 | if (fRec.fFlags & kDevKernText_Flag) { |
| 1264 | glyph->fRsbDelta = SkToS8(fFace->glyph->rsb_delta); |
| 1265 | glyph->fLsbDelta = SkToS8(fFace->glyph->lsb_delta); |
djsollen@google.com | d8b599c | 2012-03-19 19:44:19 +0000 | [diff] [blame] | 1266 | } |
| 1267 | } |
djsollen@google.com | d8b599c | 2012-03-19 19:44:19 +0000 | [diff] [blame] | 1268 | } |
| 1269 | |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 1270 | if (fFace->glyph->format == FT_GLYPH_FORMAT_BITMAP && fScaleY && fFace->size->metrics.y_ppem) { |
| 1271 | // NOTE: both dimensions are scaled by y_ppem. this is WAI. |
| 1272 | scaleGlyphMetrics(*glyph, SkScalarDiv(SkFixedToScalar(fScaleY), |
| 1273 | SkIntToScalar(fFace->size->metrics.y_ppem))); |
| 1274 | } |
djsollen@google.com | d8b599c | 2012-03-19 19:44:19 +0000 | [diff] [blame] | 1275 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1276 | #ifdef ENABLE_GLYPH_SPEW |
| 1277 | SkDEBUGF(("FT_Set_Char_Size(this:%p sx:%x sy:%x ", this, fScaleX, fScaleY)); |
| 1278 | SkDEBUGF(("Metrics(glyph:%d flags:0x%x) w:%d\n", glyph->getGlyphID(fBaseGlyphCount), fLoadGlyphFlags, glyph->fWidth)); |
| 1279 | #endif |
| 1280 | } |
| 1281 | |
reed@google.com | ea2333d | 2011-03-14 16:44:56 +0000 | [diff] [blame] | 1282 | |
bungeman@google.com | a76de72 | 2012-10-26 19:35:54 +0000 | [diff] [blame] | 1283 | void SkScalerContext_FreeType::generateImage(const SkGlyph& glyph) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1284 | SkAutoMutexAcquire ac(gFTMutex); |
| 1285 | |
| 1286 | FT_Error err; |
| 1287 | |
| 1288 | if (this->setupSize()) { |
| 1289 | goto ERROR; |
| 1290 | } |
| 1291 | |
| 1292 | err = FT_Load_Glyph( fFace, glyph.getGlyphID(fBaseGlyphCount), fLoadGlyphFlags); |
| 1293 | if (err != 0) { |
| 1294 | SkDEBUGF(("SkScalerContext_FreeType::generateImage: FT_Load_Glyph(glyph:%d width:%d height:%d rb:%d flags:%d) returned 0x%x\n", |
| 1295 | glyph.getGlyphID(fBaseGlyphCount), glyph.fWidth, glyph.fHeight, glyph.rowBytes(), fLoadGlyphFlags, err)); |
| 1296 | ERROR: |
| 1297 | memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight); |
| 1298 | return; |
| 1299 | } |
| 1300 | |
commit-bot@chromium.org | 6fa81d7 | 2013-12-26 15:50:29 +0000 | [diff] [blame] | 1301 | emboldenIfNeeded(fFace, fFace->glyph); |
bungeman@google.com | a76de72 | 2012-10-26 19:35:54 +0000 | [diff] [blame] | 1302 | generateGlyphImage(fFace, glyph); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1303 | } |
| 1304 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1305 | |
| 1306 | void SkScalerContext_FreeType::generatePath(const SkGlyph& glyph, |
| 1307 | SkPath* path) { |
| 1308 | SkAutoMutexAcquire ac(gFTMutex); |
| 1309 | |
| 1310 | SkASSERT(&glyph && path); |
| 1311 | |
| 1312 | if (this->setupSize()) { |
| 1313 | path->reset(); |
| 1314 | return; |
| 1315 | } |
| 1316 | |
| 1317 | uint32_t flags = fLoadGlyphFlags; |
| 1318 | flags |= FT_LOAD_NO_BITMAP; // ignore embedded bitmaps so we're sure to get the outline |
| 1319 | flags &= ~FT_LOAD_RENDER; // don't scan convert (we just want the outline) |
| 1320 | |
| 1321 | FT_Error err = FT_Load_Glyph( fFace, glyph.getGlyphID(fBaseGlyphCount), flags); |
| 1322 | |
| 1323 | if (err != 0) { |
| 1324 | SkDEBUGF(("SkScalerContext_FreeType::generatePath: FT_Load_Glyph(glyph:%d flags:%d) returned 0x%x\n", |
| 1325 | glyph.getGlyphID(fBaseGlyphCount), flags, err)); |
| 1326 | path->reset(); |
| 1327 | return; |
| 1328 | } |
commit-bot@chromium.org | 6fa81d7 | 2013-12-26 15:50:29 +0000 | [diff] [blame] | 1329 | emboldenIfNeeded(fFace, fFace->glyph); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1330 | |
sugoi@google.com | 66a58ac | 2013-03-05 20:40:52 +0000 | [diff] [blame] | 1331 | generateGlyphPath(fFace, path); |
bungeman@google.com | 8ff8a19 | 2012-09-25 20:38:28 +0000 | [diff] [blame] | 1332 | |
| 1333 | // The path's origin from FreeType is always the horizontal layout origin. |
| 1334 | // Offset the path so that it is relative to the vertical origin if needed. |
| 1335 | if (fRec.fFlags & SkScalerContext::kVertical_Flag) { |
| 1336 | FT_Vector vector; |
| 1337 | vector.x = fFace->glyph->metrics.vertBearingX - fFace->glyph->metrics.horiBearingX; |
| 1338 | vector.y = -fFace->glyph->metrics.vertBearingY - fFace->glyph->metrics.horiBearingY; |
| 1339 | FT_Vector_Transform(&vector, &fMatrix22); |
| 1340 | path->offset(SkFDot6ToScalar(vector.x), -SkFDot6ToScalar(vector.y)); |
| 1341 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1342 | } |
| 1343 | |
| 1344 | void SkScalerContext_FreeType::generateFontMetrics(SkPaint::FontMetrics* mx, |
| 1345 | SkPaint::FontMetrics* my) { |
| 1346 | if (NULL == mx && NULL == my) { |
| 1347 | return; |
| 1348 | } |
| 1349 | |
| 1350 | SkAutoMutexAcquire ac(gFTMutex); |
| 1351 | |
| 1352 | if (this->setupSize()) { |
reed@android.com | a8a8b8b | 2009-05-04 15:00:11 +0000 | [diff] [blame] | 1353 | ERROR: |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1354 | if (mx) { |
reed@android.com | 4516f47 | 2009-06-29 16:25:36 +0000 | [diff] [blame] | 1355 | sk_bzero(mx, sizeof(SkPaint::FontMetrics)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1356 | } |
| 1357 | if (my) { |
reed@android.com | 4516f47 | 2009-06-29 16:25:36 +0000 | [diff] [blame] | 1358 | sk_bzero(my, sizeof(SkPaint::FontMetrics)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1359 | } |
| 1360 | return; |
| 1361 | } |
| 1362 | |
reed@android.com | a8a8b8b | 2009-05-04 15:00:11 +0000 | [diff] [blame] | 1363 | FT_Face face = fFace; |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 1364 | SkScalar scaleX = fScale.x(); |
reed@google.com | f073b33 | 2013-05-06 12:21:16 +0000 | [diff] [blame] | 1365 | SkScalar scaleY = fScale.y(); |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 1366 | SkScalar mxy = fMatrix22Scalar.getSkewX() * scaleY; |
| 1367 | SkScalar myy = fMatrix22Scalar.getScaleY() * scaleY; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1368 | |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 1369 | // fetch units/EM from "head" table if needed (ie for bitmap fonts) |
| 1370 | SkScalar upem = SkIntToScalar(face->units_per_EM); |
| 1371 | if (!upem) { |
| 1372 | TT_Header* ttHeader = (TT_Header*)FT_Get_Sfnt_Table(face, ft_sfnt_head); |
| 1373 | if (ttHeader) { |
| 1374 | upem = SkIntToScalar(ttHeader->Units_Per_EM); |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 1375 | } |
| 1376 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1377 | |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 1378 | // use the os/2 table as a source of reasonable defaults. |
| 1379 | SkScalar x_height = 0.0f; |
| 1380 | SkScalar avgCharWidth = 0.0f; |
bungeman@google.com | cbe1b54 | 2013-12-16 17:02:39 +0000 | [diff] [blame] | 1381 | SkScalar cap_height = 0.0f; |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 1382 | TT_OS2* os2 = (TT_OS2*) FT_Get_Sfnt_Table(face, ft_sfnt_os2); |
| 1383 | if (os2) { |
| 1384 | x_height = scaleX * SkIntToScalar(os2->sxHeight) / upem; |
| 1385 | avgCharWidth = SkIntToScalar(os2->xAvgCharWidth) / upem; |
bungeman@google.com | cbe1b54 | 2013-12-16 17:02:39 +0000 | [diff] [blame] | 1386 | if (os2->version != 0xFFFF && os2->version >= 2) { |
| 1387 | cap_height = scaleX * SkIntToScalar(os2->sCapHeight) / upem; |
| 1388 | } |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 1389 | } |
| 1390 | |
| 1391 | // pull from format-specific metrics as needed |
| 1392 | SkScalar ascent, descent, leading, xmin, xmax, ymin, ymax; |
| 1393 | if (face->face_flags & FT_FACE_FLAG_SCALABLE) { // scalable outline font |
| 1394 | ascent = -SkIntToScalar(face->ascender) / upem; |
| 1395 | descent = -SkIntToScalar(face->descender) / upem; |
| 1396 | leading = SkIntToScalar(face->height + (face->descender - face->ascender)) / upem; |
| 1397 | xmin = SkIntToScalar(face->bbox.xMin) / upem; |
| 1398 | xmax = SkIntToScalar(face->bbox.xMax) / upem; |
| 1399 | ymin = -SkIntToScalar(face->bbox.yMin) / upem; |
| 1400 | ymax = -SkIntToScalar(face->bbox.yMax) / upem; |
bungeman@google.com | cbe1b54 | 2013-12-16 17:02:39 +0000 | [diff] [blame] | 1401 | // we may be able to synthesize x_height and cap_height from outline |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 1402 | if (!x_height) { |
bungeman@google.com | cbe1b54 | 2013-12-16 17:02:39 +0000 | [diff] [blame] | 1403 | FT_BBox bbox; |
| 1404 | if (getCBoxForLetter('x', &bbox)) { |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 1405 | x_height = SkIntToScalar(bbox.yMax) / 64.0f; |
| 1406 | } |
| 1407 | } |
bungeman@google.com | cbe1b54 | 2013-12-16 17:02:39 +0000 | [diff] [blame] | 1408 | if (!cap_height) { |
| 1409 | FT_BBox bbox; |
| 1410 | if (getCBoxForLetter('H', &bbox)) { |
| 1411 | cap_height = SkIntToScalar(bbox.yMax) / 64.0f; |
| 1412 | } |
| 1413 | } |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 1414 | } else if (fStrikeIndex != -1) { // bitmap strike metrics |
| 1415 | SkScalar xppem = SkIntToScalar(face->size->metrics.x_ppem); |
| 1416 | SkScalar yppem = SkIntToScalar(face->size->metrics.y_ppem); |
| 1417 | ascent = -SkIntToScalar(face->size->metrics.ascender) / (yppem * 64.0f); |
| 1418 | descent = -SkIntToScalar(face->size->metrics.descender) / (yppem * 64.0f); |
| 1419 | leading = (SkIntToScalar(face->size->metrics.height) / (yppem * 64.0f)) |
| 1420 | + ascent - descent; |
| 1421 | xmin = 0.0f; |
| 1422 | xmax = SkIntToScalar(face->available_sizes[fStrikeIndex].width) / xppem; |
| 1423 | ymin = descent + leading; |
| 1424 | ymax = ascent - descent; |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 1425 | } else { |
| 1426 | goto ERROR; |
| 1427 | } |
| 1428 | |
| 1429 | // synthesize elements that were not provided by the os/2 table or format-specific metrics |
| 1430 | if (!x_height) { |
| 1431 | x_height = -ascent; |
| 1432 | } |
| 1433 | if (!avgCharWidth) { |
| 1434 | avgCharWidth = xmax - xmin; |
| 1435 | } |
bungeman@google.com | cbe1b54 | 2013-12-16 17:02:39 +0000 | [diff] [blame] | 1436 | if (!cap_height) { |
| 1437 | cap_height = -ascent; |
| 1438 | } |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 1439 | |
| 1440 | // disallow negative linespacing |
| 1441 | if (leading < 0.0f) { |
| 1442 | leading = 0.0f; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1443 | } |
| 1444 | |
| 1445 | if (mx) { |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 1446 | mx->fTop = ymax * mxy; |
| 1447 | mx->fAscent = ascent * mxy; |
| 1448 | mx->fDescent = descent * mxy; |
| 1449 | mx->fBottom = ymin * mxy; |
| 1450 | mx->fLeading = leading * mxy; |
| 1451 | mx->fAvgCharWidth = avgCharWidth * mxy; |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 1452 | mx->fXMin = xmin; |
| 1453 | mx->fXMax = xmax; |
| 1454 | mx->fXHeight = x_height; |
bungeman@google.com | cbe1b54 | 2013-12-16 17:02:39 +0000 | [diff] [blame] | 1455 | mx->fCapHeight = cap_height; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1456 | } |
| 1457 | if (my) { |
bungeman@google.com | c9a8a7e | 2013-12-10 18:09:36 +0000 | [diff] [blame] | 1458 | my->fTop = ymax * myy; |
| 1459 | my->fAscent = ascent * myy; |
| 1460 | my->fDescent = descent * myy; |
| 1461 | my->fBottom = ymin * myy; |
| 1462 | my->fLeading = leading * myy; |
| 1463 | my->fAvgCharWidth = avgCharWidth * myy; |
agl@chromium.org | cc3096b | 2009-04-22 22:09:04 +0000 | [diff] [blame] | 1464 | my->fXMin = xmin; |
| 1465 | my->fXMax = xmax; |
| 1466 | my->fXHeight = x_height; |
bungeman@google.com | cbe1b54 | 2013-12-16 17:02:39 +0000 | [diff] [blame] | 1467 | my->fCapHeight = cap_height; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1468 | } |
| 1469 | } |
| 1470 | |
commit-bot@chromium.org | 6fa81d7 | 2013-12-26 15:50:29 +0000 | [diff] [blame] | 1471 | void SkScalerContext_FreeType::emboldenIfNeeded(FT_Face face, FT_GlyphSlot glyph) |
| 1472 | { |
| 1473 | if (fRec.fFlags & SkScalerContext::kEmbolden_Flag) { |
| 1474 | switch ( glyph->format ) { |
| 1475 | case FT_GLYPH_FORMAT_OUTLINE: |
| 1476 | FT_Pos strength; |
| 1477 | strength = FT_MulFix(face->units_per_EM, face->size->metrics.y_scale) / 24; |
| 1478 | FT_Outline_Embolden(&glyph->outline, strength); |
| 1479 | break; |
| 1480 | case FT_GLYPH_FORMAT_BITMAP: |
| 1481 | FT_GlyphSlot_Own_Bitmap(glyph); |
| 1482 | FT_Bitmap_Embolden(glyph->library, &glyph->bitmap, kBitmapEmboldenStrength, 0); |
| 1483 | break; |
| 1484 | default: |
| 1485 | SkDEBUGFAIL("unknown glyph format"); |
| 1486 | } |
| 1487 | } |
| 1488 | } |
| 1489 | |
reed@google.com | b4162b1 | 2013-07-02 16:32:29 +0000 | [diff] [blame] | 1490 | /////////////////////////////////////////////////////////////////////////////// |
| 1491 | |
| 1492 | #include "SkUtils.h" |
| 1493 | |
| 1494 | static SkUnichar next_utf8(const void** chars) { |
| 1495 | return SkUTF8_NextUnichar((const char**)chars); |
| 1496 | } |
| 1497 | |
| 1498 | static SkUnichar next_utf16(const void** chars) { |
| 1499 | return SkUTF16_NextUnichar((const uint16_t**)chars); |
| 1500 | } |
| 1501 | |
| 1502 | static SkUnichar next_utf32(const void** chars) { |
| 1503 | const SkUnichar** uniChars = (const SkUnichar**)chars; |
| 1504 | SkUnichar uni = **uniChars; |
| 1505 | *uniChars += 1; |
| 1506 | return uni; |
| 1507 | } |
| 1508 | |
| 1509 | typedef SkUnichar (*EncodingProc)(const void**); |
| 1510 | |
| 1511 | static EncodingProc find_encoding_proc(SkTypeface::Encoding enc) { |
| 1512 | static const EncodingProc gProcs[] = { |
| 1513 | next_utf8, next_utf16, next_utf32 |
| 1514 | }; |
| 1515 | SkASSERT((size_t)enc < SK_ARRAY_COUNT(gProcs)); |
| 1516 | return gProcs[enc]; |
| 1517 | } |
| 1518 | |
| 1519 | int SkTypeface_FreeType::onCharsToGlyphs(const void* chars, Encoding encoding, |
| 1520 | uint16_t glyphs[], int glyphCount) const { |
| 1521 | AutoFTAccess fta(this); |
| 1522 | FT_Face face = fta.face(); |
| 1523 | if (!face) { |
| 1524 | if (glyphs) { |
| 1525 | sk_bzero(glyphs, glyphCount * sizeof(glyphs[0])); |
| 1526 | } |
| 1527 | return 0; |
| 1528 | } |
| 1529 | |
| 1530 | EncodingProc next_uni_proc = find_encoding_proc(encoding); |
| 1531 | |
| 1532 | if (NULL == glyphs) { |
| 1533 | for (int i = 0; i < glyphCount; ++i) { |
| 1534 | if (0 == FT_Get_Char_Index(face, next_uni_proc(&chars))) { |
| 1535 | return i; |
| 1536 | } |
| 1537 | } |
| 1538 | return glyphCount; |
| 1539 | } else { |
| 1540 | int first = glyphCount; |
| 1541 | for (int i = 0; i < glyphCount; ++i) { |
| 1542 | unsigned id = FT_Get_Char_Index(face, next_uni_proc(&chars)); |
| 1543 | glyphs[i] = SkToU16(id); |
| 1544 | if (0 == id && i < first) { |
| 1545 | first = i; |
| 1546 | } |
| 1547 | } |
| 1548 | return first; |
| 1549 | } |
| 1550 | } |
| 1551 | |
| 1552 | int SkTypeface_FreeType::onCountGlyphs() const { |
| 1553 | // we cache this value, using -1 as a sentinel for "not computed" |
| 1554 | if (fGlyphCount < 0) { |
| 1555 | AutoFTAccess fta(this); |
| 1556 | FT_Face face = fta.face(); |
| 1557 | // if the face failed, we still assign a non-negative value |
| 1558 | fGlyphCount = face ? face->num_glyphs : 0; |
| 1559 | } |
| 1560 | return fGlyphCount; |
| 1561 | } |
| 1562 | |
bungeman@google.com | 839702b | 2013-08-07 17:09:22 +0000 | [diff] [blame] | 1563 | SkTypeface::LocalizedStrings* SkTypeface_FreeType::onCreateFamilyNameIterator() const { |
bungeman@google.com | a980269 | 2013-08-07 02:45:25 +0000 | [diff] [blame] | 1564 | SkTypeface::LocalizedStrings* nameIter = |
| 1565 | SkOTUtils::LocalizedStrings_NameTable::CreateForFamilyNames(*this); |
| 1566 | if (NULL == nameIter) { |
| 1567 | SkString familyName; |
| 1568 | this->getFamilyName(&familyName); |
| 1569 | SkString language("und"); //undetermined |
| 1570 | nameIter = new SkOTUtils::LocalizedStrings_SingleName(familyName, language); |
| 1571 | } |
| 1572 | return nameIter; |
| 1573 | } |
| 1574 | |
bungeman@google.com | ddc218e | 2013-08-01 22:29:43 +0000 | [diff] [blame] | 1575 | int SkTypeface_FreeType::onGetTableTags(SkFontTableTag tags[]) const { |
| 1576 | AutoFTAccess fta(this); |
| 1577 | FT_Face face = fta.face(); |
| 1578 | |
| 1579 | FT_ULong tableCount = 0; |
| 1580 | FT_Error error; |
| 1581 | |
| 1582 | // When 'tag' is NULL, returns number of tables in 'length'. |
| 1583 | error = FT_Sfnt_Table_Info(face, 0, NULL, &tableCount); |
| 1584 | if (error) { |
| 1585 | return 0; |
| 1586 | } |
| 1587 | |
| 1588 | if (tags) { |
| 1589 | for (FT_ULong tableIndex = 0; tableIndex < tableCount; ++tableIndex) { |
| 1590 | FT_ULong tableTag; |
| 1591 | FT_ULong tablelength; |
| 1592 | error = FT_Sfnt_Table_Info(face, tableIndex, &tableTag, &tablelength); |
| 1593 | if (error) { |
| 1594 | return 0; |
| 1595 | } |
| 1596 | tags[tableIndex] = static_cast<SkFontTableTag>(tableTag); |
| 1597 | } |
| 1598 | } |
| 1599 | return tableCount; |
| 1600 | } |
| 1601 | |
| 1602 | size_t SkTypeface_FreeType::onGetTableData(SkFontTableTag tag, size_t offset, |
| 1603 | size_t length, void* data) const |
| 1604 | { |
| 1605 | AutoFTAccess fta(this); |
| 1606 | FT_Face face = fta.face(); |
| 1607 | |
| 1608 | FT_ULong tableLength = 0; |
| 1609 | FT_Error error; |
| 1610 | |
| 1611 | // When 'length' is 0 it is overwritten with the full table length; 'offset' is ignored. |
| 1612 | error = FT_Load_Sfnt_Table(face, tag, 0, NULL, &tableLength); |
| 1613 | if (error) { |
| 1614 | return 0; |
| 1615 | } |
| 1616 | |
| 1617 | if (offset > tableLength) { |
| 1618 | return 0; |
| 1619 | } |
bungeman@google.com | 5ecd4fa | 2013-08-01 22:48:21 +0000 | [diff] [blame] | 1620 | FT_ULong size = SkTMin((FT_ULong)length, tableLength - (FT_ULong)offset); |
bungeman@google.com | ddc218e | 2013-08-01 22:29:43 +0000 | [diff] [blame] | 1621 | if (NULL != data) { |
| 1622 | error = FT_Load_Sfnt_Table(face, tag, offset, reinterpret_cast<FT_Byte*>(data), &size); |
| 1623 | if (error) { |
| 1624 | return 0; |
| 1625 | } |
| 1626 | } |
| 1627 | |
| 1628 | return size; |
| 1629 | } |
| 1630 | |
reed@google.com | b4162b1 | 2013-07-02 16:32:29 +0000 | [diff] [blame] | 1631 | /////////////////////////////////////////////////////////////////////////////// |
| 1632 | /////////////////////////////////////////////////////////////////////////////// |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1633 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1634 | /* Export this so that other parts of our FonttHost port can make use of our |
| 1635 | ability to extract the name+style from a stream, using FreeType's api. |
| 1636 | */ |
djsollen@google.com | 4dc686d | 2012-02-15 21:03:45 +0000 | [diff] [blame] | 1637 | bool find_name_and_attributes(SkStream* stream, SkString* name, |
bungeman@google.com | fe74765 | 2013-03-25 19:36:11 +0000 | [diff] [blame] | 1638 | SkTypeface::Style* style, bool* isFixedPitch) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1639 | FT_Library library; |
reed@android.com | bfbd4ff | 2009-07-23 17:44:41 +0000 | [diff] [blame] | 1640 | if (FT_Init_FreeType(&library)) { |
djsollen@google.com | 4dc686d | 2012-02-15 21:03:45 +0000 | [diff] [blame] | 1641 | return false; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1642 | } |
| 1643 | |
| 1644 | FT_Open_Args args; |
| 1645 | memset(&args, 0, sizeof(args)); |
| 1646 | |
| 1647 | const void* memoryBase = stream->getMemoryBase(); |
| 1648 | FT_StreamRec streamRec; |
| 1649 | |
| 1650 | if (NULL != memoryBase) { |
| 1651 | args.flags = FT_OPEN_MEMORY; |
| 1652 | args.memory_base = (const FT_Byte*)memoryBase; |
| 1653 | args.memory_size = stream->getLength(); |
| 1654 | } else { |
| 1655 | memset(&streamRec, 0, sizeof(streamRec)); |
djsollen@google.com | 5dd4502 | 2013-03-21 13:30:54 +0000 | [diff] [blame] | 1656 | streamRec.size = stream->getLength(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1657 | streamRec.descriptor.pointer = stream; |
| 1658 | streamRec.read = sk_stream_read; |
| 1659 | streamRec.close = sk_stream_close; |
| 1660 | |
| 1661 | args.flags = FT_OPEN_STREAM; |
| 1662 | args.stream = &streamRec; |
| 1663 | } |
| 1664 | |
| 1665 | FT_Face face; |
| 1666 | if (FT_Open_Face(library, &args, 0, &face)) { |
| 1667 | FT_Done_FreeType(library); |
djsollen@google.com | 4dc686d | 2012-02-15 21:03:45 +0000 | [diff] [blame] | 1668 | return false; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1669 | } |
| 1670 | |
djsollen@google.com | 4dc686d | 2012-02-15 21:03:45 +0000 | [diff] [blame] | 1671 | int tempStyle = SkTypeface::kNormal; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1672 | if (face->style_flags & FT_STYLE_FLAG_BOLD) { |
djsollen@google.com | 4dc686d | 2012-02-15 21:03:45 +0000 | [diff] [blame] | 1673 | tempStyle |= SkTypeface::kBold; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1674 | } |
| 1675 | if (face->style_flags & FT_STYLE_FLAG_ITALIC) { |
djsollen@google.com | 4dc686d | 2012-02-15 21:03:45 +0000 | [diff] [blame] | 1676 | tempStyle |= SkTypeface::kItalic; |
| 1677 | } |
| 1678 | |
| 1679 | if (name) { |
| 1680 | name->set(face->family_name); |
| 1681 | } |
| 1682 | if (style) { |
| 1683 | *style = (SkTypeface::Style) tempStyle; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1684 | } |
bungeman@google.com | fe74765 | 2013-03-25 19:36:11 +0000 | [diff] [blame] | 1685 | if (isFixedPitch) { |
| 1686 | *isFixedPitch = FT_IS_FIXED_WIDTH(face); |
reed@google.com | 5b31b0f | 2011-02-23 14:41:42 +0000 | [diff] [blame] | 1687 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1688 | |
| 1689 | FT_Done_Face(face); |
| 1690 | FT_Done_FreeType(library); |
djsollen@google.com | 4dc686d | 2012-02-15 21:03:45 +0000 | [diff] [blame] | 1691 | return true; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1692 | } |