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

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/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;
+}
+
-- 
1.7.11.7