| /* |
| * Copyright (C) 2006, 2007, 2008, 2009 Apple 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: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. 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 APPLE INC. AND ITS 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 APPLE INC. OR ITS 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/Font.h" |
| |
| #include "core/platform/graphics/FontFallbackList.h" |
| #include "core/platform/graphics/GraphicsContext.h" |
| #include "core/platform/graphics/SimpleFontData.h" |
| #include "core/platform/graphics/mac/ComplexTextController.h" |
| #include "platform/fonts/GlyphBuffer.h" |
| #include "platform/geometry/IntRect.h" |
| #include "platform/graphics/TextRun.h" |
| #include "wtf/MathExtras.h" |
| |
| #include "core/platform/graphics/harfbuzz/HarfBuzzShaper.h" |
| |
| using namespace std; |
| |
| namespace WebCore { |
| |
| static bool preferHarfBuzz(const Font* font) |
| { |
| const FontDescription& description = font->fontDescription(); |
| return description.featureSettings() && description.featureSettings()->size() > 0; |
| } |
| |
| FloatRect Font::selectionRectForComplexText(const TextRun& run, const FloatPoint& point, int h, |
| int from, int to) const |
| { |
| if (preferHarfBuzz(this)) { |
| HarfBuzzShaper shaper(this, run); |
| if (shaper.shape()) |
| return shaper.selectionRect(point, h, from, to); |
| } |
| ComplexTextController controller(this, run); |
| controller.advance(from); |
| float beforeWidth = controller.runWidthSoFar(); |
| controller.advance(to); |
| float afterWidth = controller.runWidthSoFar(); |
| |
| // Using roundf() rather than ceilf() for the right edge as a compromise to ensure correct caret positioning |
| if (run.rtl()) { |
| float totalWidth = controller.totalWidth(); |
| return FloatRect(floorf(point.x() + totalWidth - afterWidth), point.y(), roundf(point.x() + totalWidth - beforeWidth) - floorf(point.x() + totalWidth - afterWidth), h); |
| } |
| |
| return FloatRect(floorf(point.x() + beforeWidth), point.y(), roundf(point.x() + afterWidth) - floorf(point.x() + beforeWidth), h); |
| } |
| |
| float Font::getGlyphsAndAdvancesForComplexText(const TextRun& run, int from, int to, GlyphBuffer& glyphBuffer, ForTextEmphasisOrNot forTextEmphasis) const |
| { |
| float initialAdvance; |
| |
| ComplexTextController controller(this, run, false, 0, forTextEmphasis); |
| controller.advance(from); |
| float beforeWidth = controller.runWidthSoFar(); |
| controller.advance(to, &glyphBuffer); |
| |
| if (glyphBuffer.isEmpty()) |
| return 0; |
| |
| float afterWidth = controller.runWidthSoFar(); |
| |
| if (run.rtl()) { |
| initialAdvance = controller.totalWidth() + controller.finalRoundingWidth() - afterWidth; |
| glyphBuffer.reverse(0, glyphBuffer.size()); |
| } else |
| initialAdvance = beforeWidth; |
| |
| return initialAdvance; |
| } |
| |
| void Font::drawComplexText(GraphicsContext* context, const TextRunPaintInfo& runInfo, const FloatPoint& point) const |
| { |
| if (preferHarfBuzz(this)) { |
| GlyphBuffer glyphBuffer; |
| HarfBuzzShaper shaper(this, runInfo.run); |
| shaper.setDrawRange(runInfo.from, runInfo.to); |
| if (shaper.shape(&glyphBuffer)) { |
| drawGlyphBuffer(context, runInfo, glyphBuffer, point); |
| return; |
| } |
| } |
| // This glyph buffer holds our glyphs + advances + font data for each glyph. |
| GlyphBuffer glyphBuffer; |
| |
| float startX = point.x() + getGlyphsAndAdvancesForComplexText(runInfo.run, runInfo.from, runInfo.to, glyphBuffer); |
| |
| // We couldn't generate any glyphs for the run. Give up. |
| if (glyphBuffer.isEmpty()) |
| return; |
| |
| // Draw the glyph buffer now at the starting point returned in startX. |
| FloatPoint startPoint(startX, point.y()); |
| drawGlyphBuffer(context, runInfo, glyphBuffer, startPoint); |
| } |
| |
| void Font::drawEmphasisMarksForComplexText(GraphicsContext* context, const TextRunPaintInfo& runInfo, const AtomicString& mark, const FloatPoint& point) const |
| { |
| GlyphBuffer glyphBuffer; |
| float initialAdvance = getGlyphsAndAdvancesForComplexText(runInfo.run, runInfo.from, runInfo.to, glyphBuffer, ForTextEmphasis); |
| |
| if (glyphBuffer.isEmpty()) |
| return; |
| |
| drawEmphasisMarks(context, runInfo, glyphBuffer, mark, FloatPoint(point.x() + initialAdvance, point.y())); |
| } |
| |
| float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const |
| { |
| if (preferHarfBuzz(this)) { |
| HarfBuzzShaper shaper(this, run); |
| if (shaper.shape()) |
| return shaper.totalWidth(); |
| } |
| ComplexTextController controller(this, run, true, fallbackFonts); |
| if (glyphOverflow) { |
| glyphOverflow->top = max<int>(glyphOverflow->top, ceilf(-controller.minGlyphBoundingBoxY()) - (glyphOverflow->computeBounds ? 0 : fontMetrics().ascent())); |
| glyphOverflow->bottom = max<int>(glyphOverflow->bottom, ceilf(controller.maxGlyphBoundingBoxY()) - (glyphOverflow->computeBounds ? 0 : fontMetrics().descent())); |
| glyphOverflow->left = max<int>(0, ceilf(-controller.minGlyphBoundingBoxX())); |
| glyphOverflow->right = max<int>(0, ceilf(controller.maxGlyphBoundingBoxX() - controller.totalWidth())); |
| } |
| return controller.totalWidth(); |
| } |
| |
| int Font::offsetForPositionForComplexText(const TextRun& run, float x, bool includePartialGlyphs) const |
| { |
| if (preferHarfBuzz(this)) { |
| HarfBuzzShaper shaper(this, run); |
| if (shaper.shape()) |
| return shaper.offsetForPosition(x); |
| } |
| ComplexTextController controller(this, run); |
| return controller.offsetForPosition(x, includePartialGlyphs); |
| } |
| |
| const SimpleFontData* Font::fontDataForCombiningCharacterSequence(const UChar* characters, size_t length, FontDataVariant variant) const |
| { |
| UChar32 baseCharacter; |
| size_t baseCharacterLength = 0; |
| U16_NEXT(characters, baseCharacterLength, length, baseCharacter); |
| |
| GlyphData baseCharacterGlyphData = glyphDataForCharacter(baseCharacter, false, variant); |
| |
| if (!baseCharacterGlyphData.glyph) |
| return 0; |
| |
| if (length == baseCharacterLength) |
| return baseCharacterGlyphData.fontData; |
| |
| bool triedBaseCharacterFontData = false; |
| |
| unsigned i = 0; |
| for (const FontData* fontData = fontDataAt(0); fontData; fontData = fontDataAt(++i)) { |
| const SimpleFontData* simpleFontData = fontData->fontDataForCharacter(baseCharacter); |
| if (variant == NormalVariant) { |
| if (simpleFontData->platformData().orientation() == Vertical) { |
| if (isCJKIdeographOrSymbol(baseCharacter) && !simpleFontData->hasVerticalGlyphs()) { |
| variant = BrokenIdeographVariant; |
| simpleFontData = simpleFontData->brokenIdeographFontData().get(); |
| } else if (m_fontDescription.nonCJKGlyphOrientation() == NonCJKGlyphOrientationVerticalRight) { |
| SimpleFontData* verticalRightFontData = simpleFontData->verticalRightOrientationFontData().get(); |
| Glyph verticalRightGlyph = verticalRightFontData->glyphForCharacter(baseCharacter); |
| if (verticalRightGlyph == baseCharacterGlyphData.glyph) |
| simpleFontData = verticalRightFontData; |
| } else { |
| SimpleFontData* uprightFontData = simpleFontData->uprightOrientationFontData().get(); |
| Glyph uprightGlyph = uprightFontData->glyphForCharacter(baseCharacter); |
| if (uprightGlyph != baseCharacterGlyphData.glyph) |
| simpleFontData = uprightFontData; |
| } |
| } |
| } else { |
| if (const SimpleFontData* variantFontData = simpleFontData->variantFontData(m_fontDescription, variant).get()) |
| simpleFontData = variantFontData; |
| } |
| |
| if (simpleFontData == baseCharacterGlyphData.fontData) |
| triedBaseCharacterFontData = true; |
| |
| if (simpleFontData->canRenderCombiningCharacterSequence(characters, length)) |
| return simpleFontData; |
| } |
| |
| if (!triedBaseCharacterFontData && baseCharacterGlyphData.fontData && baseCharacterGlyphData.fontData->canRenderCombiningCharacterSequence(characters, length)) |
| return baseCharacterGlyphData.fontData; |
| |
| return SimpleFontData::systemFallback(); |
| } |
| |
| } // namespace WebCore |
