Moving GraphicsContext and dependencies from core to platform.

Source/core/platform/graphics/harfbuzz/HarfBuzzFaceSkia.cpp

-/*
- * Copyright (c) 2012 Google Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "config.h"
-#include "core/platform/graphics/harfbuzz/HarfBuzzFace.h"
-
-#include "SkPaint.h"
-#include "SkPath.h"
-#include "SkPoint.h"
-#include "SkRect.h"
-#include "SkTypeface.h"
-#include "SkUtils.h"
-#include "core/platform/graphics/FontPlatformData.h"
-#include "core/platform/graphics/SimpleFontData.h"
-#include "core/platform/graphics/harfbuzz/HarfBuzzShaper.h"
-#include "platform/fonts/GlyphBuffer.h"
-
-#include "hb.h"
-#include "wtf/HashMap.h"
-
-namespace WebCore {
-
-// Our implementation of the callbacks which HarfBuzz requires by using Skia
-// calls. See the HarfBuzz source for references about what these callbacks do.
-
-struct HarfBuzzFontData {
-    HarfBuzzFontData(WTF::HashMap<uint32_t, uint16_t>* glyphCacheForFaceCacheEntry)
-        : m_glyphCacheForFaceCacheEntry(glyphCacheForFaceCacheEntry)
-    { }
-    SkPaint m_paint;
-    WTF::HashMap<uint32_t, uint16_t>* m_glyphCacheForFaceCacheEntry;
-};
-
-static hb_position_t SkiaScalarToHarfBuzzPosition(SkScalar value)
-{
-    return SkScalarToFixed(value);
-}
-
-static void SkiaGetGlyphWidthAndExtents(SkPaint* paint, hb_codepoint_t codepoint, hb_position_t* width, hb_glyph_extents_t* extents)
-{
-    ASSERT(codepoint <= 0xFFFF);
-    paint->setTextEncoding(SkPaint::kGlyphID_TextEncoding);
-
-    SkScalar skWidth;
-    SkRect skBounds;
-    uint16_t glyph = codepoint;
-
-    paint->getTextWidths(&glyph, sizeof(glyph), &skWidth, &skBounds);
-    if (width)
-        *width = SkiaScalarToHarfBuzzPosition(skWidth);
-    if (extents) {
-        // Invert y-axis because Skia is y-grows-down but we set up HarfBuzz to be y-grows-up.
-        extents->x_bearing = SkiaScalarToHarfBuzzPosition(skBounds.fLeft);
-        extents->y_bearing = SkiaScalarToHarfBuzzPosition(-skBounds.fTop);
-        extents->width = SkiaScalarToHarfBuzzPosition(skBounds.width());
-        extents->height = SkiaScalarToHarfBuzzPosition(-skBounds.height());
-    }
-}
-
-static hb_bool_t harfBuzzGetGlyph(hb_font_t* hbFont, void* fontData, hb_codepoint_t unicode, hb_codepoint_t variationSelector, hb_codepoint_t* glyph, void* userData)
-{
-    HarfBuzzFontData* hbFontData = reinterpret_cast<HarfBuzzFontData*>(fontData);
-
-    WTF::HashMap<uint32_t, uint16_t>::AddResult result = hbFontData->m_glyphCacheForFaceCacheEntry->add(unicode, 0);
-    if (result.isNewEntry) {
-        SkPaint* paint = &hbFontData->m_paint;
-        paint->setTextEncoding(SkPaint::kUTF32_TextEncoding);
-        uint16_t glyph16;
-        paint->textToGlyphs(&unicode, sizeof(hb_codepoint_t), &glyph16);
-        result.iterator->value = glyph16;
-        *glyph = glyph16;
-    }
-    *glyph = result.iterator->value;
-    return !!*glyph;
-}
-
-static hb_position_t harfBuzzGetGlyphHorizontalAdvance(hb_font_t* hbFont, void* fontData, hb_codepoint_t glyph, void* userData)
-{
-    HarfBuzzFontData* hbFontData = reinterpret_cast<HarfBuzzFontData*>(fontData);
-    hb_position_t advance = 0;
-
-    SkiaGetGlyphWidthAndExtents(&hbFontData->m_paint, glyph, &advance, 0);
-    return advance;
-}
-
-static hb_bool_t harfBuzzGetGlyphHorizontalOrigin(hb_font_t* hbFont, void* fontData, hb_codepoint_t glyph, hb_position_t* x, hb_position_t* y, void* userData)
-{
-    // Just return true, following the way that HarfBuzz-FreeType
-    // implementation does.
-    return true;
-}
-
-static hb_bool_t harfBuzzGetGlyphExtents(hb_font_t* hbFont, void* fontData, hb_codepoint_t glyph, hb_glyph_extents_t* extents, void* userData)
-{
-    HarfBuzzFontData* hbFontData = reinterpret_cast<HarfBuzzFontData*>(fontData);
-
-    SkiaGetGlyphWidthAndExtents(&hbFontData->m_paint, glyph, 0, extents);
-    return true;
-}
-
-static hb_font_funcs_t* harfBuzzSkiaGetFontFuncs()
-{
-    static hb_font_funcs_t* harfBuzzSkiaFontFuncs = 0;
-
-    // We don't set callback functions which we can't support.
-    // HarfBuzz will use the fallback implementation if they aren't set.
-    if (!harfBuzzSkiaFontFuncs) {
-        harfBuzzSkiaFontFuncs = hb_font_funcs_create();
-        hb_font_funcs_set_glyph_func(harfBuzzSkiaFontFuncs, harfBuzzGetGlyph, 0, 0);
-        hb_font_funcs_set_glyph_h_advance_func(harfBuzzSkiaFontFuncs, harfBuzzGetGlyphHorizontalAdvance, 0, 0);
-        hb_font_funcs_set_glyph_h_origin_func(harfBuzzSkiaFontFuncs, harfBuzzGetGlyphHorizontalOrigin, 0, 0);
-        hb_font_funcs_set_glyph_extents_func(harfBuzzSkiaFontFuncs, harfBuzzGetGlyphExtents, 0, 0);
-        hb_font_funcs_make_immutable(harfBuzzSkiaFontFuncs);
-    }
-    return harfBuzzSkiaFontFuncs;
-}
-
-static hb_blob_t* harfBuzzSkiaGetTable(hb_face_t* face, hb_tag_t tag, void* userData)
-{
-    SkTypeface* typeface = reinterpret_cast<SkTypeface*>(userData);
-
-    const size_t tableSize = typeface->getTableSize(tag);
-    if (!tableSize)
-        return 0;
-
-    char* buffer = reinterpret_cast<char*>(fastMalloc(tableSize));
-    if (!buffer)
-        return 0;
-    size_t actualSize = typeface->getTableData(tag, 0, tableSize, buffer);
-    if (tableSize != actualSize) {
-        fastFree(buffer);
-        return 0;
-    }
-
-    return hb_blob_create(const_cast<char*>(buffer), tableSize, HB_MEMORY_MODE_WRITABLE, buffer, fastFree);
-}
-
-static void destroyHarfBuzzFontData(void* userData)
-{
-    HarfBuzzFontData* hbFontData = reinterpret_cast<HarfBuzzFontData*>(userData);
-    delete hbFontData;
-}
-
-hb_face_t* HarfBuzzFace::createFace()
-{
-    hb_face_t* face = hb_face_create_for_tables(harfBuzzSkiaGetTable, m_platformData->typeface(), 0);
-    ASSERT(face);
-    return face;
-}
-
-hb_font_t* HarfBuzzFace::createFont()
-{
-    HarfBuzzFontData* hbFontData = new HarfBuzzFontData(m_glyphCacheForFaceCacheEntry);
-    m_platformData->setupPaint(&hbFontData->m_paint);
-    hb_font_t* font = hb_font_create(m_face);
-    hb_font_set_funcs(font, harfBuzzSkiaGetFontFuncs(), hbFontData, destroyHarfBuzzFontData);
-    float size = m_platformData->size();
-    int scale = SkiaScalarToHarfBuzzPosition(size);
-    hb_font_set_scale(font, scale, scale);
-    hb_font_make_immutable(font);
-    return font;
-}
-
-GlyphBufferAdvance HarfBuzzShaper::createGlyphBufferAdvance(float width, float height)
-{
-    return GlyphBufferAdvance(width, height);
-}
-
-} // namespace WebCore