The Tor Browser: gfx/skia/trunk/src/ports/SkFontHost

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     2 /*

     3  * Copyright 2012 Mozilla Foundation

     4  *

     5  * Use of this source code is governed by a BSD-style license that can be

     6  * found in the LICENSE file.

     7  */

     9 #include "cairo.h"

    10 #include "cairo-ft.h"

    12 #include "SkFontHost_FreeType_common.h"

    14 #include "SkAdvancedTypefaceMetrics.h"

    15 #include "SkFontHost.h"

    16 #include "SkPath.h"

    17 #include "SkScalerContext.h"

    18 #include "SkTypefaceCache.h"

    20 #include <ft2build.h>

    21 #include FT_FREETYPE_H

    23 #ifndef SK_FONTHOST_CAIRO_STANDALONE

    24 #define SK_FONTHOST_CAIRO_STANDALONE 1

    25 #endif

    27 static cairo_user_data_key_t kSkTypefaceKey;

    29 class SkScalerContext_CairoFT : public SkScalerContext_FreeType_Base {

    30 public:

    31     SkScalerContext_CairoFT(SkTypeface* typeface, const SkDescriptor* desc);

    32     virtual ~SkScalerContext_CairoFT();

    34 protected:

    35     virtual unsigned generateGlyphCount() SK_OVERRIDE;

    36     virtual uint16_t generateCharToGlyph(SkUnichar uniChar) SK_OVERRIDE;

    37     virtual void generateAdvance(SkGlyph* glyph) SK_OVERRIDE;

    38     virtual void generateMetrics(SkGlyph* glyph) SK_OVERRIDE;

    39     virtual void generateImage(const SkGlyph& glyph) SK_OVERRIDE;

    40     virtual void generatePath(const SkGlyph& glyph, SkPath* path) SK_OVERRIDE;

    41     virtual void generateFontMetrics(SkPaint::FontMetrics* mx,

    42                                      SkPaint::FontMetrics* my) SK_OVERRIDE;

    43     virtual SkUnichar generateGlyphToChar(uint16_t glyph) SK_OVERRIDE;

    44 private:

    45     cairo_scaled_font_t* fScaledFont;

    46     uint32_t fLoadGlyphFlags;

    47 };

    49 class CairoLockedFTFace {

    50 public:

    51     CairoLockedFTFace(cairo_scaled_font_t* scaledFont)

    52         : fScaledFont(scaledFont)

    53         , fFace(cairo_ft_scaled_font_lock_face(scaledFont))

    54     {}

    56     ~CairoLockedFTFace()

    57     {

    58         cairo_ft_scaled_font_unlock_face(fScaledFont);

    59     }

    61     FT_Face getFace()

    62     {

    63         return fFace;

    64     }

    66 private:

    67     cairo_scaled_font_t* fScaledFont;

    68     FT_Face fFace;

    69 };

    71 class SkCairoFTTypeface : public SkTypeface {

    72 public:

    73     static SkTypeface* CreateTypeface(cairo_font_face_t* fontFace, SkTypeface::Style style, bool isFixedWidth) {

    74         SkASSERT(fontFace != NULL);

    75         SkASSERT(cairo_font_face_get_type(fontFace) == CAIRO_FONT_TYPE_FT);

    77         SkFontID newId = SkTypefaceCache::NewFontID();

    79         return SkNEW_ARGS(SkCairoFTTypeface, (fontFace, style, newId, isFixedWidth));

    80     }

    82     cairo_font_face_t* getFontFace() {

    83         return fFontFace;

    84     }

    86     virtual SkStream* onOpenStream(int*) const SK_OVERRIDE { return NULL; }

    88     virtual SkAdvancedTypefaceMetrics*

    89         onGetAdvancedTypefaceMetrics(SkAdvancedTypefaceMetrics::PerGlyphInfo,

    90                                      const uint32_t*, uint32_t) const SK_OVERRIDE

    91     {

    92         SkDEBUGCODE(SkDebugf("SkCairoFTTypeface::onGetAdvancedTypefaceMetrics unimplemented\n"));

    93         return NULL;

    94     }

    96     virtual SkScalerContext* onCreateScalerContext(const SkDescriptor* desc) const SK_OVERRIDE

    97     {

    98         return SkNEW_ARGS(SkScalerContext_CairoFT, (const_cast<SkCairoFTTypeface*>(this), desc));

    99     }

   101     virtual void onFilterRec(SkScalerContextRec*) const SK_OVERRIDE

   102     {

   103         SkDEBUGCODE(SkDebugf("SkCairoFTTypeface::onFilterRec unimplemented\n"));

   104     }

   106     virtual void onGetFontDescriptor(SkFontDescriptor*, bool*) const SK_OVERRIDE

   107     {

   108         SkDEBUGCODE(SkDebugf("SkCairoFTTypeface::onGetFontDescriptor unimplemented\n"));

   109     }

   111     virtual int onCharsToGlyphs(void const*, SkTypeface::Encoding, uint16_t*, int) const SK_OVERRIDE

   112     {

   113         return 0;

   114     }

   116     virtual int onCountGlyphs() const SK_OVERRIDE

   117     {

   118         return 0;

   119     }

   121     virtual int onGetUPEM() const SK_OVERRIDE

   122     {

   123         return 0;

   124     }

   126     virtual SkTypeface::LocalizedStrings* onCreateFamilyNameIterator() const SK_OVERRIDE

   127     {

   128         return NULL;

   129     }

   131     virtual int onGetTableTags(SkFontTableTag*) const SK_OVERRIDE

   132     {

   133         return 0;

   134     }

   136     virtual size_t onGetTableData(SkFontTableTag, size_t, size_t, void*) const SK_OVERRIDE

   137     {

   138         return 0;

   139     }

   141 private:

   143     SkCairoFTTypeface(cairo_font_face_t* fontFace, SkTypeface::Style style, SkFontID id, bool isFixedWidth)

   144         : SkTypeface(style, id, isFixedWidth)

   145         , fFontFace(fontFace)

   146     {

   147         cairo_font_face_set_user_data(fFontFace, &kSkTypefaceKey, this, NULL);

   148         cairo_font_face_reference(fFontFace);

   149     }

   151     ~SkCairoFTTypeface()

   152     {

   153         cairo_font_face_set_user_data(fFontFace, &kSkTypefaceKey, NULL, NULL);

   154         cairo_font_face_destroy(fFontFace);

   155     }

   157     cairo_font_face_t* fFontFace;

   158 };

   160 SkTypeface* SkCreateTypefaceFromCairoFont(cairo_font_face_t* fontFace, SkTypeface::Style style, bool isFixedWidth)

   161 {

   162     SkTypeface* typeface = reinterpret_cast<SkTypeface*>(cairo_font_face_get_user_data(fontFace, &kSkTypefaceKey));

   164     if (typeface) {

   165         typeface->ref();

   166     } else {

   167         typeface = SkCairoFTTypeface::CreateTypeface(fontFace, style, isFixedWidth);

   168         SkTypefaceCache::Add(typeface, style);

   169     }

   171     return typeface;

   172 }

   174 #if defined(SK_FONTHOST_DOES_NOT_USE_FONTMGR) && SK_FONTHOST_CAIRO_STANDALONE

   175 SkTypeface* SkFontHost::CreateTypeface(const SkTypeface* familyFace,

   176                                      const char famillyName[],

   177                                      SkTypeface::Style style)

   178 {

   179     SkDEBUGFAIL("SkFontHost::FindTypeface unimplemented");

   180     return NULL;

   181 }

   183 SkTypeface* SkFontHost::CreateTypefaceFromStream(SkStream*)

   184 {

   185     SkDEBUGFAIL("SkFontHost::CreateTypeface unimplemented");

   186     return NULL;

   187 }

   189 SkTypeface* SkFontHost::CreateTypefaceFromFile(char const*)

   190 {

   191     SkDEBUGFAIL("SkFontHost::CreateTypefaceFromFile unimplemented");

   192     return NULL;

   193 }

   194 #endif

   196 ///////////////////////////////////////////////////////////////////////////////

   198 static bool isLCD(const SkScalerContext::Rec& rec) {

   199     switch (rec.fMaskFormat) {

   200         case SkMask::kLCD16_Format:

   201         case SkMask::kLCD32_Format:

   202             return true;

   203         default:

   204             return false;

   205     }

   206 }

   208 ///////////////////////////////////////////////////////////////////////////////

   209 SkScalerContext_CairoFT::SkScalerContext_CairoFT(SkTypeface* typeface, const SkDescriptor* desc)

   210     : SkScalerContext_FreeType_Base(typeface, desc)

   211 {

   212     SkMatrix matrix;

   213     fRec.getSingleMatrix(&matrix);

   215     cairo_font_face_t* fontFace = static_cast<SkCairoFTTypeface*>(typeface)->getFontFace();

   217     cairo_matrix_t fontMatrix, ctMatrix;

   218     cairo_matrix_init(&fontMatrix, matrix.getScaleX(), matrix.getSkewY(), matrix.getSkewX(), matrix.getScaleY(), 0.0, 0.0);

   219     cairo_matrix_init_scale(&ctMatrix, 1.0, 1.0);

   221     // We need to ensure that the font options match for hinting, as generateMetrics()

   222     // uses the fScaledFont which uses these font options

   223     cairo_font_options_t *fontOptions = cairo_font_options_create();

   225     FT_Int32 loadFlags = FT_LOAD_DEFAULT;

   227     if (SkMask::kBW_Format == fRec.fMaskFormat) {

   228         // See http://code.google.com/p/chromium/issues/detail?id=43252#c24

   229         loadFlags = FT_LOAD_TARGET_MONO;

   230         if (fRec.getHinting() == SkPaint::kNo_Hinting) {

   231             cairo_font_options_set_hint_style(fontOptions, CAIRO_HINT_STYLE_NONE);

   232             loadFlags = FT_LOAD_NO_HINTING;

   233         }

   234     } else {

   235         switch (fRec.getHinting()) {

   236         case SkPaint::kNo_Hinting:

   237             loadFlags = FT_LOAD_NO_HINTING;

   238             cairo_font_options_set_hint_style(fontOptions, CAIRO_HINT_STYLE_NONE);

   239             break;

   240         case SkPaint::kSlight_Hinting:

   241             loadFlags = FT_LOAD_TARGET_LIGHT;  // This implies FORCE_AUTOHINT

   242             cairo_font_options_set_hint_style(fontOptions, CAIRO_HINT_STYLE_SLIGHT);

   243             break;

   244         case SkPaint::kNormal_Hinting:

   245             cairo_font_options_set_hint_style(fontOptions, CAIRO_HINT_STYLE_MEDIUM);

   246             if (fRec.fFlags & SkScalerContext::kForceAutohinting_Flag) {

   247                 loadFlags = FT_LOAD_FORCE_AUTOHINT;

   248             }

   249             break;

   250         case SkPaint::kFull_Hinting:

   251             cairo_font_options_set_hint_style(fontOptions, CAIRO_HINT_STYLE_FULL);

   252             if (fRec.fFlags & SkScalerContext::kForceAutohinting_Flag) {

   253                 loadFlags = FT_LOAD_FORCE_AUTOHINT;

   254             }

   255             if (isLCD(fRec)) {

   256                 if (SkToBool(fRec.fFlags & SkScalerContext::kLCD_Vertical_Flag)) {

   257                     loadFlags = FT_LOAD_TARGET_LCD_V;

   258                 } else {

   259                     loadFlags = FT_LOAD_TARGET_LCD;

   260                 }

   261             }

   262             break;

   263         default:

   264             SkDebugf("---------- UNKNOWN hinting %d\n", fRec.getHinting());

   265             break;

   266         }

   267     }

   269     fScaledFont = cairo_scaled_font_create(fontFace, &fontMatrix, &ctMatrix, fontOptions);

   271     if ((fRec.fFlags & SkScalerContext::kEmbeddedBitmapText_Flag) == 0) {

   272         loadFlags |= FT_LOAD_NO_BITMAP;

   273     }

   275     // Always using FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH to get correct

   276     // advances, as fontconfig and cairo do.

   277     // See http://code.google.com/p/skia/issues/detail?id=222.

   278     loadFlags |= FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH;

   280     fLoadGlyphFlags = loadFlags;

   281 }

   283 SkScalerContext_CairoFT::~SkScalerContext_CairoFT()

   284 {

   285     cairo_scaled_font_destroy(fScaledFont);

   286 }

   288 unsigned SkScalerContext_CairoFT::generateGlyphCount()

   289 {

   290     CairoLockedFTFace faceLock(fScaledFont);

   291     return faceLock.getFace()->num_glyphs;

   292 }

   294 uint16_t SkScalerContext_CairoFT::generateCharToGlyph(SkUnichar uniChar)

   295 {

   296     CairoLockedFTFace faceLock(fScaledFont);

   297     return SkToU16(FT_Get_Char_Index(faceLock.getFace(), uniChar));

   298 }

   300 void SkScalerContext_CairoFT::generateAdvance(SkGlyph* glyph)

   301 {

   302     generateMetrics(glyph);

   303 }

   305 void SkScalerContext_CairoFT::generateMetrics(SkGlyph* glyph)

   306 {

   307     SkASSERT(fScaledFont != NULL);

   308     cairo_text_extents_t extents;

   309     cairo_glyph_t cairoGlyph = { glyph->getGlyphID(fBaseGlyphCount), 0.0, 0.0 };

   310     cairo_scaled_font_glyph_extents(fScaledFont, &cairoGlyph, 1, &extents);

   312     glyph->fAdvanceX = SkDoubleToFixed(extents.x_advance);

   313     glyph->fAdvanceY = SkDoubleToFixed(extents.y_advance);

   314     glyph->fWidth = SkToU16(SkScalarCeilToInt(extents.width));

   315     glyph->fHeight = SkToU16(SkScalarCeilToInt(extents.height));

   316     glyph->fLeft = SkToS16(SkScalarCeilToInt(extents.x_bearing));

   317     glyph->fTop = SkToS16(SkScalarCeilToInt(extents.y_bearing));

   318     glyph->fLsbDelta = 0;

   319     glyph->fRsbDelta = 0;

   320 }

   322 void SkScalerContext_CairoFT::generateImage(const SkGlyph& glyph)

   323 {

   324     SkASSERT(fScaledFont != NULL);

   325     CairoLockedFTFace faceLock(fScaledFont);

   326     FT_Face face = faceLock.getFace();

   328     FT_Error err = FT_Load_Glyph(face, glyph.getGlyphID(fBaseGlyphCount), fLoadGlyphFlags);

   330     if (err != 0) {

   331         memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight);

   332         return;

   333     }

   335     generateGlyphImage(face, glyph);

   336 }

   338 void SkScalerContext_CairoFT::generatePath(const SkGlyph& glyph, SkPath* path)

   339 {

   340     SkASSERT(fScaledFont != NULL);

   341     CairoLockedFTFace faceLock(fScaledFont);

   342     FT_Face face = faceLock.getFace();

   344     SkASSERT(&glyph && path);

   346     uint32_t flags = fLoadGlyphFlags;

   347     flags |= FT_LOAD_NO_BITMAP; // ignore embedded bitmaps so we're sure to get the outline

   348     flags &= ~FT_LOAD_RENDER;   // don't scan convert (we just want the outline)

   350     FT_Error err = FT_Load_Glyph(face, glyph.getGlyphID(fBaseGlyphCount), flags);

   352     if (err != 0) {

   353         path->reset();

   354         return;

   355     }

   357     generateGlyphPath(face, path);

   358 }

   360 void SkScalerContext_CairoFT::generateFontMetrics(SkPaint::FontMetrics* mx,

   361                                                   SkPaint::FontMetrics* my)

   362 {

   363     SkDEBUGCODE(SkDebugf("SkScalerContext_CairoFT::generateFontMetrics unimplemented\n"));

   364 }

   366 SkUnichar SkScalerContext_CairoFT::generateGlyphToChar(uint16_t glyph)

   367 {

   368     SkASSERT(fScaledFont != NULL);

   369     CairoLockedFTFace faceLock(fScaledFont);

   370     FT_Face face = faceLock.getFace();

   372     FT_UInt glyphIndex;

   373     SkUnichar charCode = FT_Get_First_Char(face, &glyphIndex);

   374     while (glyphIndex != 0) {

   375         if (glyphIndex == glyph) {

   376             return charCode;

   377         }

   378         charCode = FT_Get_Next_Char(face, charCode, &glyphIndex);

   379     }

   381     return 0;

   382 }

   384 ///////////////////////////////////////////////////////////////////////////////

   386 #include "SkFontMgr.h"

   388 SkFontMgr* SkFontMgr::Factory() {

   389     // todo

   390     return NULL;

   391 }

The Tor Browser / file revision

gfx/skia/trunk/src/ports/SkFontHost_cairo.cpp@6474c204b198

gfx/skia/trunk/src/ports/SkFontHost_cairo.cpp