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Diffstat (limited to 'WebCore/platform/graphics/android/HarfbuzzSkia.cpp')
| -rw-r--r-- | WebCore/platform/graphics/android/HarfbuzzSkia.cpp | 220 |
1 files changed, 0 insertions, 220 deletions
diff --git a/WebCore/platform/graphics/android/HarfbuzzSkia.cpp b/WebCore/platform/graphics/android/HarfbuzzSkia.cpp deleted file mode 100644 index 81841f2..0000000 --- a/WebCore/platform/graphics/android/HarfbuzzSkia.cpp +++ /dev/null @@ -1,220 +0,0 @@ -/* - * Copyright 2010, The Android Open Source Project - * Copyright 2010, 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. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``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 "FontPlatformData.h" -#include "wtf/OwnArrayPtr.h" - -#include "SkFontHost.h" -#include "SkPaint.h" -#include "SkPath.h" -#include "SkPoint.h" -#include "SkRect.h" - -extern "C" { -#include "harfbuzz-shaper.h" -} - -// This file implements the callbacks which Harfbuzz requires by using Skia -// calls. See the Harfbuzz source for references about what these callbacks do. - -namespace WebCore { - -static HB_Fixed SkiaScalarToHarfbuzzFixed(SkScalar value) -{ - // HB_Fixed is a 26.6 fixed point format. - return value * 64; -} - -static HB_Bool stringToGlyphs(HB_Font hbFont, const HB_UChar16* characters, hb_uint32 length, HB_Glyph* glyphs, hb_uint32* glyphsSize, HB_Bool isRTL) -{ - FontPlatformData* font = reinterpret_cast<FontPlatformData*>(hbFont->userData); - SkPaint paint; - - font->setupPaint(&paint); - paint.setTextEncoding(SkPaint::kUTF16_TextEncoding); - int numGlyphs = paint.textToGlyphs(characters, length * sizeof(uint16_t), reinterpret_cast<uint16_t*>(glyphs)); - - // HB_Glyph is 32-bit, but Skia outputs only 16-bit numbers. So our - // |glyphs| array needs to be converted. - for (int i = numGlyphs - 1; i >= 0; --i) { - uint16_t value; - // We use a memcpy to avoid breaking strict aliasing rules. - memcpy(&value, reinterpret_cast<char*>(glyphs) + sizeof(uint16_t) * i, sizeof(value)); - glyphs[i] = value; - } - - *glyphsSize = numGlyphs; - return 1; -} - -static void glyphsToAdvances(HB_Font hbFont, const HB_Glyph* glyphs, hb_uint32 numGlyphs, HB_Fixed* advances, int flags) -{ - FontPlatformData* font = reinterpret_cast<FontPlatformData*>(hbFont->userData); - SkPaint paint; - - font->setupPaint(&paint); - paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding); - - OwnArrayPtr<uint16_t> glyphs16(new uint16_t[numGlyphs]); - if (!glyphs16.get()) - return; - for (unsigned i = 0; i < numGlyphs; ++i) - glyphs16[i] = glyphs[i]; - paint.getTextWidths(glyphs16.get(), numGlyphs * sizeof(uint16_t), reinterpret_cast<SkScalar*>(advances)); - - // The |advances| values which Skia outputs are SkScalars, which are floats - // in Chromium. However, Harfbuzz wants them in 26.6 fixed point format. - // These two formats are both 32-bits long. - for (unsigned i = 0; i < numGlyphs; ++i) { - float value; - // We use a memcpy to avoid breaking strict aliasing rules. - memcpy(&value, reinterpret_cast<char*>(advances) + sizeof(float) * i, sizeof(value)); - advances[i] = SkiaScalarToHarfbuzzFixed(value); - } -} - -static HB_Bool canRender(HB_Font hbFont, const HB_UChar16* characters, hb_uint32 length) -{ - FontPlatformData* font = reinterpret_cast<FontPlatformData*>(hbFont->userData); - SkPaint paint; - - font->setupPaint(&paint); - paint.setTextEncoding(SkPaint::kUTF16_TextEncoding); - - OwnArrayPtr<uint16_t> glyphs16(new uint16_t[length]); - glyphs16.get(); - int numGlyphs = paint.textToGlyphs(characters, length * sizeof(uint16_t), glyphs16.get()); - - for (int i = 0; i < numGlyphs; ++i) { - if (!glyphs16[i]) - return false; - } - - return true; -} - -static HB_Error getOutlinePoint(HB_Font hbFont, HB_Glyph glyph, int flags, hb_uint32 point, HB_Fixed* xPos, HB_Fixed* yPos, hb_uint32* resultingNumPoints) -{ - FontPlatformData* font = reinterpret_cast<FontPlatformData*>(hbFont->userData); - SkPaint paint; - - if (flags & HB_ShaperFlag_UseDesignMetrics) - return HB_Err_Invalid_Argument; // This is requesting pre-hinted positions. We can't support this. - - font->setupPaint(&paint); - paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding); - uint16_t glyph16 = glyph; - SkPath path; - paint.getTextPath(&glyph16, sizeof(glyph16), 0, 0, &path); - uint32_t numPoints = path.getPoints(0, 0); - if (point >= numPoints) - return HB_Err_Invalid_SubTable; - SkPoint* points = reinterpret_cast<SkPoint*>(fastMalloc(sizeof(SkPoint) * (point + 1))); - if (!points) - return HB_Err_Invalid_SubTable; - // Skia does let us get a single point from the path. - path.getPoints(points, point + 1); - *xPos = SkiaScalarToHarfbuzzFixed(points[point].fX); - *yPos = SkiaScalarToHarfbuzzFixed(points[point].fY); - *resultingNumPoints = numPoints; - fastFree(points); - - return HB_Err_Ok; -} - -static void getGlyphMetrics(HB_Font hbFont, HB_Glyph glyph, HB_GlyphMetrics* metrics) -{ - FontPlatformData* font = reinterpret_cast<FontPlatformData*>(hbFont->userData); - SkPaint paint; - - font->setupPaint(&paint); - paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding); - uint16_t glyph16 = glyph; - SkScalar width; - SkRect bounds; - paint.getTextWidths(&glyph16, sizeof(glyph16), &width, &bounds); - - metrics->x = SkiaScalarToHarfbuzzFixed(bounds.fLeft); - metrics->y = SkiaScalarToHarfbuzzFixed(bounds.fTop); - metrics->width = SkiaScalarToHarfbuzzFixed(bounds.width()); - metrics->height = SkiaScalarToHarfbuzzFixed(bounds.height()); - - metrics->xOffset = SkiaScalarToHarfbuzzFixed(width); - // We can't actually get the |y| correct because Skia doesn't export - // the vertical advance. However, nor we do ever render vertical text at - // the moment so it's unimportant. - metrics->yOffset = 0; -} - -static HB_Fixed getFontMetric(HB_Font hbFont, HB_FontMetric metric) -{ - FontPlatformData* font = reinterpret_cast<FontPlatformData*>(hbFont->userData); - SkPaint paint; - - font->setupPaint(&paint); - SkPaint::FontMetrics skiaMetrics; - paint.getFontMetrics(&skiaMetrics); - - switch (metric) { - case HB_FontAscent: - return SkiaScalarToHarfbuzzFixed(-skiaMetrics.fAscent); - // We don't support getting the rest of the metrics and Harfbuzz doesn't seem to need them. - default: - return 0; - } -} - -HB_FontClass harfbuzzSkiaClass = { - stringToGlyphs, - glyphsToAdvances, - canRender, - getOutlinePoint, - getGlyphMetrics, - getFontMetric, -}; - -HB_Error harfbuzzSkiaGetTable(void* voidface, const HB_Tag tag, HB_Byte* buffer, HB_UInt* len) -{ - FontPlatformData* font = reinterpret_cast<FontPlatformData*>(voidface); - - const size_t tableSize = SkFontHost::GetTableSize(font->uniqueID(), tag); - if (!tableSize) - return HB_Err_Invalid_Argument; - // If Harfbuzz specified a NULL buffer then it's asking for the size of the table. - if (!buffer) { - *len = tableSize; - return HB_Err_Ok; - } - - if (*len < tableSize) - return HB_Err_Invalid_Argument; - SkFontHost::GetTableData(font->uniqueID(), tag, 0, tableSize, buffer); - return HB_Err_Ok; -} - -} // namespace WebCore |