The Tor Browser: gfx/skia/patches/0005-Bug-736276-Add-a-new-SkFontHost-that-takes-a-cairo

gfx/skia/patches/0005-Bug-736276-Add-a-new-SkFontHost-that-takes-a-cairo_s.patch@6474c204b198 (annotated)

gfx/skia/patches/0005-Bug-736276-Add-a-new-SkFontHost-that-takes-a-cairo_s.patch

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

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

 From: George Wright <george@mozilla.com>
 Date: Wed, 1 Aug 2012 16:43:15 -0400
 Subject: Bug 736276 - Add a new SkFontHost that takes a cairo_scaled_font_t r=karl
 diff --git a/gfx/skia/Makefile.in b/gfx/skia/Makefile.in
 index 5ebbd2e..7c8cdbf 100644
 --- a/gfx/skia/Makefile.in
 +++ b/gfx/skia/Makefile.in
@@ -60,15 +60,15 @@ VPATH += \
  	$(NULL)
  ifeq (android,$(MOZ_WIDGET_TOOLKIT))
 -OS_CXXFLAGS += $(CAIRO_FT_CFLAGS)
 +OS_CXXFLAGS += $(MOZ_CAIRO_CFLAGS) $(CAIRO_FT_CFLAGS)
  endif
  ifeq (gtk2,$(MOZ_WIDGET_TOOLKIT))
 -OS_CXXFLAGS += $(MOZ_PANGO_CFLAGS)
 +OS_CXXFLAGS += $(MOZ_CAIRO_CFLAGS) $(MOZ_PANGO_CFLAGS) $(CAIRO_FT_CFLAGS)
  endif
  ifeq (qt,$(MOZ_WIDGET_TOOLKIT))
 -OS_CXXFLAGS += $(MOZ_PANGO_CFLAGS)
 +OS_CXXFLAGS += $(MOZ_CAIRO_CFLAGS) $(MOZ_PANGO_CFLAGS) $(CAIRO_FT_CFLAGS)
  ifeq (Linux,$(OS_TARGET))
  DEFINES += -DSK_USE_POSIX_THREADS=1
  endif
 diff --git a/gfx/skia/include/ports/SkTypeface_cairo.h b/gfx/skia/include/ports/SkTypeface_cairo.h
 new file mode 100644
 index 0000000..7e44f04
 --- /dev/null
 +++ b/gfx/skia/include/ports/SkTypeface_cairo.h
@@ -0,0 +1,11 @@
 +#ifndef SkTypeface_cairo_DEFINED
 +#define SkTypeface_cairo_DEFINED
 +
 +#include <cairo.h>
 +
 +#include "SkTypeface.h"
 +
 +SK_API extern SkTypeface* SkCreateTypefaceFromCairoFont(cairo_font_face_t* fontFace, SkTypeface::Style style, bool isFixedWidth);
 +
 +#endif
 +
 diff --git a/gfx/skia/moz.build b/gfx/skia/moz.build
 index 9ceba59..66efd52 100644
 --- a/gfx/skia/moz.build
 +++ b/gfx/skia/moz.build
@@ -171,10 +171,12 @@ elif CONFIG['MOZ_WIDGET_TOOLKIT'] == 'windows':
          'SkTime_win.cpp',
      ]
  elif CONFIG['MOZ_WIDGET_TOOLKIT'] == 'gtk2':
 +    EXPORTS.skia += [
 +        'include/ports/SkTypeface_cairo.h',
 +    ]
      CPP_SOURCES += [
 -        'SkFontHost_FreeType.cpp',
 +        'SkFontHost_cairo.cpp',
          'SkFontHost_FreeType_common.cpp',
 -        'SkFontHost_linux.cpp',
          'SkThread_pthread.cpp',
          'SkThreadUtils_pthread.cpp',
          'SkThreadUtils_pthread_linux.cpp',
@@ -183,14 +185,15 @@ elif CONFIG['MOZ_WIDGET_TOOLKIT'] == 'gtk2':
      ]
  elif CONFIG['MOZ_WIDGET_TOOLKIT'] == 'qt':
      CPP_SOURCES += [
 -        'SkFontHost_FreeType.cpp',
 +        'SkFontHost_cairo.cpp',
          'SkFontHost_FreeType_common.cpp',
          'SkOSFile.cpp',
      ]
      if CONFIG['OS_TARGET'] == 'Linux':
 +        EXPORTS.skia += [
 +            'include/ports/SkTypeface_cairo.h',
 +        ]
          CPP_SOURCES += [
 -            'SkFontHost_linux.cpp',
 -            'SkFontHost_tables.cpp',
              'SkThread_pthread.cpp',
              'SkThreadUtils_pthread.cpp',
              'SkThreadUtils_pthread_linux.cpp',
@@ -204,11 +207,13 @@ elif CONFIG['MOZ_WIDGET_TOOLKIT'] == 'gonk':
  # Separate 'if' from above, since the else below applies to all != 'android'
  # toolkits.
  if CONFIG['MOZ_WIDGET_TOOLKIT'] == 'android':
 +    EXPORTS.skia += [
 +        'include/ports/SkTypeface_cairo.h',
 +    ]
      CPP_SOURCES += [
          'ashmem.cpp',
          'SkDebug_android.cpp',
 -        'SkFontHost_android_old.cpp',
 -        'SkFontHost_FreeType.cpp',
 +        'SkFontHost_cairo.cpp',
          'SkFontHost_FreeType_common.cpp',
          'SkImageRef_ashmem.cpp',
          'SkTime_Unix.cpp',
 diff --git a/gfx/skia/src/ports/SkFontHost_cairo.cpp b/gfx/skia/src/ports/SkFontHost_cairo.cpp
 new file mode 100644
 index 0000000..bb5b778
 --- /dev/null
 +++ b/gfx/skia/src/ports/SkFontHost_cairo.cpp
@@ -0,0 +1,364 @@
 +
 +/*
 + * Copyright 2012 Mozilla Foundation
 + *
 + * Use of this source code is governed by a BSD-style license that can be
 + * found in the LICENSE file.
 + */
 +
 +#include "cairo.h"
 +#include "cairo-ft.h"
 +
 +#include "SkFontHost_FreeType_common.h"
 +
 +#include "SkAdvancedTypefaceMetrics.h"
 +#include "SkFontHost.h"
 +#include "SkPath.h"
 +#include "SkScalerContext.h"
 +#include "SkTypefaceCache.h"
 +
 +#include <ft2build.h>
 +#include FT_FREETYPE_H
 +
 +static cairo_user_data_key_t kSkTypefaceKey;
 +
 +class SkScalerContext_CairoFT : public SkScalerContext_FreeType_Base {
 +public:
 +    SkScalerContext_CairoFT(SkTypeface* typeface, const SkDescriptor* desc);
 +    virtual ~SkScalerContext_CairoFT();
 +
 +protected:
 +    virtual unsigned generateGlyphCount() SK_OVERRIDE;
 +    virtual uint16_t generateCharToGlyph(SkUnichar uniChar) SK_OVERRIDE;
 +    virtual void generateAdvance(SkGlyph* glyph) SK_OVERRIDE;
 +    virtual void generateMetrics(SkGlyph* glyph) SK_OVERRIDE;
 +    virtual void generateImage(const SkGlyph& glyph) SK_OVERRIDE;
 +    virtual void generatePath(const SkGlyph& glyph, SkPath* path) SK_OVERRIDE;
 +    virtual void generateFontMetrics(SkPaint::FontMetrics* mx,
 +                                     SkPaint::FontMetrics* my) SK_OVERRIDE;
 +    virtual SkUnichar generateGlyphToChar(uint16_t glyph) SK_OVERRIDE;
 +private:
 +    cairo_scaled_font_t* fScaledFont;
 +    uint32_t fLoadGlyphFlags;
 +};
 +
 +class CairoLockedFTFace {
 +public:
 +    CairoLockedFTFace(cairo_scaled_font_t* scaledFont)
 +        : fScaledFont(scaledFont)
 +        , fFace(cairo_ft_scaled_font_lock_face(scaledFont))
 +    {}
 +
 +    ~CairoLockedFTFace()
 +    {
 +        cairo_ft_scaled_font_unlock_face(fScaledFont);
 +    }
 +
 +    FT_Face getFace()
 +    {
 +        return fFace;
 +    }
 +
 +private:
 +    cairo_scaled_font_t* fScaledFont;
 +    FT_Face fFace;
 +};
 +
 +class SkCairoFTTypeface : public SkTypeface {
 +public:
 +    static SkTypeface* CreateTypeface(cairo_font_face_t* fontFace, SkTypeface::Style style, bool isFixedWidth) {
 +        SkASSERT(fontFace != NULL);
 +        SkASSERT(cairo_font_face_get_type(fontFace) == CAIRO_FONT_TYPE_FT);
 +
 +        SkFontID newId = SkTypefaceCache::NewFontID();
 +
 +        return SkNEW_ARGS(SkCairoFTTypeface, (fontFace, style, newId, isFixedWidth));
 +    }
 +
 +    cairo_font_face_t* getFontFace() {
 +        return fFontFace;
 +    }
 +
 +    virtual SkStream* onOpenStream(int*) const SK_OVERRIDE { return NULL; }
 +
 +    virtual SkAdvancedTypefaceMetrics*
 +        onGetAdvancedTypefaceMetrics(SkAdvancedTypefaceMetrics::PerGlyphInfo,
 +                                     const uint32_t*, uint32_t) const SK_OVERRIDE
 +    {
 +        SkDEBUGCODE(SkDebugf("SkCairoFTTypeface::onGetAdvancedTypefaceMetrics unimplemented\n"));
 +        return NULL;
 +    }
 +
 +    virtual SkScalerContext* onCreateScalerContext(const SkDescriptor* desc) const SK_OVERRIDE
 +    {
 +        return SkNEW_ARGS(SkScalerContext_CairoFT, (const_cast<SkCairoFTTypeface*>(this), desc));
 +    }
 +
 +    virtual void onFilterRec(SkScalerContextRec*) const SK_OVERRIDE
 +    {
 +        SkDEBUGCODE(SkDebugf("SkCairoFTTypeface::onFilterRec unimplemented\n"));
 +    }
 +
 +    virtual void onGetFontDescriptor(SkFontDescriptor*, bool*) const SK_OVERRIDE
 +    {
 +        SkDEBUGCODE(SkDebugf("SkCairoFTTypeface::onGetFontDescriptor unimplemented\n"));
 +    }
 +
 +
 +private:
 +
 +    SkCairoFTTypeface(cairo_font_face_t* fontFace, SkTypeface::Style style, SkFontID id, bool isFixedWidth)
 +        : SkTypeface(style, id, isFixedWidth)
 +        , fFontFace(fontFace)
 +    {
 +        cairo_font_face_set_user_data(fFontFace, &kSkTypefaceKey, this, NULL);
 +        cairo_font_face_reference(fFontFace);
 +    }
 +
 +    ~SkCairoFTTypeface()
 +    {
 +        cairo_font_face_set_user_data(fFontFace, &kSkTypefaceKey, NULL, NULL);
 +        cairo_font_face_destroy(fFontFace);
 +    }
 +
 +    cairo_font_face_t* fFontFace;
 +};
 +
 +SkTypeface* SkCreateTypefaceFromCairoFont(cairo_font_face_t* fontFace, SkTypeface::Style style, bool isFixedWidth)
 +{
 +    SkTypeface* typeface = reinterpret_cast<SkTypeface*>(cairo_font_face_get_user_data(fontFace, &kSkTypefaceKey));
 +
 +    if (typeface) {
 +        typeface->ref();
 +    } else {
 +        typeface = SkCairoFTTypeface::CreateTypeface(fontFace, style, isFixedWidth);
 +        SkTypefaceCache::Add(typeface, style);
 +    }
 +
 +    return typeface;
 +}
 +
 +SkTypeface* SkFontHost::CreateTypeface(const SkTypeface* familyFace,
 +                                     const char famillyName[],
 +                                     SkTypeface::Style style)
 +{
 +    SkDEBUGFAIL("SkFontHost::FindTypeface unimplemented");
 +    return NULL;
 +}
 +
 +SkTypeface* SkFontHost::CreateTypefaceFromStream(SkStream*)
 +{
 +    SkDEBUGFAIL("SkFontHost::CreateTypeface unimplemented");
 +    return NULL;
 +}
 +
 +SkTypeface* SkFontHost::CreateTypefaceFromFile(char const*)
 +{
 +    SkDEBUGFAIL("SkFontHost::CreateTypefaceFromFile unimplemented");
 +    return NULL;
 +}
 +
 +///////////////////////////////////////////////////////////////////////////////
 +
 +static bool isLCD(const SkScalerContext::Rec& rec) {
 +    switch (rec.fMaskFormat) {
 +        case SkMask::kLCD16_Format:
 +        case SkMask::kLCD32_Format:
 +            return true;
 +        default:
 +            return false;
 +    }
 +}
 +
 +///////////////////////////////////////////////////////////////////////////////
 +SkScalerContext_CairoFT::SkScalerContext_CairoFT(SkTypeface* typeface, const SkDescriptor* desc)
 +    : SkScalerContext_FreeType_Base(typeface, desc)
 +{
 +    SkMatrix matrix;
 +    fRec.getSingleMatrix(&matrix);
 +
 +    cairo_font_face_t* fontFace = static_cast<SkCairoFTTypeface*>(typeface)->getFontFace();
 +
 +    cairo_matrix_t fontMatrix, ctMatrix;
 +    cairo_matrix_init(&fontMatrix, matrix.getScaleX(), matrix.getSkewY(), matrix.getSkewX(), matrix.getScaleY(), 0.0, 0.0);
 +    cairo_matrix_init_scale(&ctMatrix, 1.0, 1.0);
 +
 +    // We need to ensure that the font options match for hinting, as generateMetrics()
 +    // uses the fScaledFont which uses these font options
 +    cairo_font_options_t *fontOptions = cairo_font_options_create();
 +
 +    FT_Int32 loadFlags = FT_LOAD_DEFAULT;
 +
 +    if (SkMask::kBW_Format == fRec.fMaskFormat) {
 +        // See http://code.google.com/p/chromium/issues/detail?id=43252#c24
 +        loadFlags = FT_LOAD_TARGET_MONO;
 +        if (fRec.getHinting() == SkPaint::kNo_Hinting) {
 +            cairo_font_options_set_hint_style(fontOptions, CAIRO_HINT_STYLE_NONE);
 +            loadFlags = FT_LOAD_NO_HINTING;
 +        }
 +    } else {
 +        switch (fRec.getHinting()) {
 +        case SkPaint::kNo_Hinting:
 +            loadFlags = FT_LOAD_NO_HINTING;
 +            cairo_font_options_set_hint_style(fontOptions, CAIRO_HINT_STYLE_NONE);
 +            break;
 +        case SkPaint::kSlight_Hinting:
 +            loadFlags = FT_LOAD_TARGET_LIGHT;  // This implies FORCE_AUTOHINT
 +            cairo_font_options_set_hint_style(fontOptions, CAIRO_HINT_STYLE_SLIGHT);
 +            break;
 +        case SkPaint::kNormal_Hinting:
 +            cairo_font_options_set_hint_style(fontOptions, CAIRO_HINT_STYLE_MEDIUM);
 +            if (fRec.fFlags & SkScalerContext::kAutohinting_Flag) {
 +                loadFlags = FT_LOAD_FORCE_AUTOHINT;
 +            }
 +            break;
 +        case SkPaint::kFull_Hinting:
 +            cairo_font_options_set_hint_style(fontOptions, CAIRO_HINT_STYLE_FULL);
 +            if (fRec.fFlags & SkScalerContext::kAutohinting_Flag) {
 +                loadFlags = FT_LOAD_FORCE_AUTOHINT;
 +            }
 +            if (isLCD(fRec)) {
 +                if (SkToBool(fRec.fFlags & SkScalerContext::kLCD_Vertical_Flag)) {
 +                    loadFlags = FT_LOAD_TARGET_LCD_V;
 +                } else {
 +                    loadFlags = FT_LOAD_TARGET_LCD;
 +                }
 +            }
 +            break;
 +        default:
 +            SkDebugf("---------- UNKNOWN hinting %d\n", fRec.getHinting());
 +            break;
 +        }
 +    }
 +
 +    fScaledFont = cairo_scaled_font_create(fontFace, &fontMatrix, &ctMatrix, fontOptions);
 +
 +    if ((fRec.fFlags & SkScalerContext::kEmbeddedBitmapText_Flag) == 0) {
 +        loadFlags |= FT_LOAD_NO_BITMAP;
 +    }
 +
 +    // Always using FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH to get correct
 +    // advances, as fontconfig and cairo do.
 +    // See http://code.google.com/p/skia/issues/detail?id=222.
 +    loadFlags |= FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH;
 +
 +    fLoadGlyphFlags = loadFlags;
 +}
 +
 +SkScalerContext_CairoFT::~SkScalerContext_CairoFT()
 +{
 +    cairo_scaled_font_destroy(fScaledFont);
 +}
 +
 +unsigned SkScalerContext_CairoFT::generateGlyphCount()
 +{
 +    CairoLockedFTFace faceLock(fScaledFont);
 +    return faceLock.getFace()->num_glyphs;
 +}
 +
 +uint16_t SkScalerContext_CairoFT::generateCharToGlyph(SkUnichar uniChar)
 +{
 +    CairoLockedFTFace faceLock(fScaledFont);
 +    return SkToU16(FT_Get_Char_Index(faceLock.getFace(), uniChar));
 +}
 +
 +void SkScalerContext_CairoFT::generateAdvance(SkGlyph* glyph)
 +{
 +    generateMetrics(glyph);
 +}
 +
 +void SkScalerContext_CairoFT::generateMetrics(SkGlyph* glyph)
 +{
 +    SkASSERT(fScaledFont != NULL);
 +    cairo_text_extents_t extents;
 +    cairo_glyph_t cairoGlyph = { glyph->getGlyphID(fBaseGlyphCount), 0.0, 0.0 };
 +    cairo_scaled_font_glyph_extents(fScaledFont, &cairoGlyph, 1, &extents);
 +
 +    glyph->fAdvanceX = SkDoubleToFixed(extents.x_advance);
 +    glyph->fAdvanceY = SkDoubleToFixed(extents.y_advance);
 +    glyph->fWidth = SkToU16(SkScalarCeil(extents.width));
 +    glyph->fHeight = SkToU16(SkScalarCeil(extents.height));
 +    glyph->fLeft = SkToS16(SkScalarCeil(extents.x_bearing));
 +    glyph->fTop = SkToS16(SkScalarCeil(extents.y_bearing));
 +    glyph->fLsbDelta = 0;
 +    glyph->fRsbDelta = 0;
 +}
 +
 +void SkScalerContext_CairoFT::generateImage(const SkGlyph& glyph)
 +{
 +    SkASSERT(fScaledFont != NULL);
 +    CairoLockedFTFace faceLock(fScaledFont);
 +    FT_Face face = faceLock.getFace();
 +
 +    FT_Error err = FT_Load_Glyph(face, glyph.getGlyphID(fBaseGlyphCount), fLoadGlyphFlags);
 +
 +    if (err != 0) {
 +        memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight);
 +        return;
 +    }
 +
 +    generateGlyphImage(face, glyph);
 +}
 +
 +void SkScalerContext_CairoFT::generatePath(const SkGlyph& glyph, SkPath* path)
 +{
 +    SkASSERT(fScaledFont != NULL);
 +    CairoLockedFTFace faceLock(fScaledFont);
 +    FT_Face face = faceLock.getFace();
 +
 +    SkASSERT(&glyph && path);
 +
 +    uint32_t flags = fLoadGlyphFlags;
 +    flags |= FT_LOAD_NO_BITMAP; // ignore embedded bitmaps so we're sure to get the outline
 +    flags &= ~FT_LOAD_RENDER;   // don't scan convert (we just want the outline)
 +
 +    FT_Error err = FT_Load_Glyph(face, glyph.getGlyphID(fBaseGlyphCount), flags);
 +
 +    if (err != 0) {
 +        path->reset();
 +        return;
 +    }
 +
 +    generateGlyphPath(face, path);
 +}
 +
 +void SkScalerContext_CairoFT::generateFontMetrics(SkPaint::FontMetrics* mx,
 +                                                  SkPaint::FontMetrics* my)
 +{
 +    SkDEBUGCODE(SkDebugf("SkScalerContext_CairoFT::generateFontMetrics unimplemented\n"));
 +}
 +
 +SkUnichar SkScalerContext_CairoFT::generateGlyphToChar(uint16_t glyph)
 +{
 +    SkASSERT(fScaledFont != NULL);
 +    CairoLockedFTFace faceLock(fScaledFont);
 +    FT_Face face = faceLock.getFace();
 +
 +    FT_UInt glyphIndex;
 +    SkUnichar charCode = FT_Get_First_Char(face, &glyphIndex);
 +    while (glyphIndex != 0) {
 +        if (glyphIndex == glyph) {
 +            return charCode;
 +        }
 +        charCode = FT_Get_Next_Char(face, charCode, &glyphIndex);
 +    }
 +
 +    return 0;
 +}
 +
 +#ifdef SK_BUILD_FOR_ANDROID
 +SkTypeface* SkAndroidNextLogicalTypeface(SkFontID currFontID,
 +                                         SkFontID origFontID) {
 +    return NULL;
 +}
 +#endif
 +
 +///////////////////////////////////////////////////////////////////////////////
 +
 +#include "SkFontMgr.h"
 +
 +SkFontMgr* SkFontMgr::Factory() {
 +    // todo
 +    return NULL;
 +}
 +
 --
 .7.11.7

The Tor Browser / annotate

gfx/skia/patches/0005-Bug-736276-Add-a-new-SkFontHost-that-takes-a-cairo_s.patch@6474c204b198 (annotated)

gfx/skia/patches/0005-Bug-736276-Add-a-new-SkFontHost-that-takes-a-cairo_s.patch