| /* |
| * Copyright (C) 2006, 2007, 2008 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 COMPUTER, INC. ``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 COMPUTER, INC. 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 "Font.h" |
| |
| #include "FontGlyphs.h" |
| #include "GlyphBuffer.h" |
| #include "GraphicsContext.h" |
| #include "IntRect.h" |
| #include "Logging.h" |
| #include "SimpleFontData.h" |
| #include "TextRun.h" |
| #include "UniscribeController.h" |
| #include <wtf/MathExtras.h> |
| |
| using namespace std; |
| |
| namespace WebCore { |
| |
| bool Font::canReturnFallbackFontsForComplexText() |
| { |
| return true; |
| } |
| |
| bool Font::canExpandAroundIdeographsInComplexText() |
| { |
| return false; |
| } |
| |
| FloatRect Font::selectionRectForComplexText(const TextRun& run, const FloatPoint& point, int h, |
| int from, int to) const |
| { |
| UniscribeController it(this, run); |
| it.advance(from); |
| float beforeWidth = it.runWidthSoFar(); |
| it.advance(to); |
| float afterWidth = it.runWidthSoFar(); |
| |
| // Using roundf() rather than ceilf() for the right edge as a compromise to ensure correct caret positioning |
| if (run.rtl()) { |
| it.advance(run.length()); |
| float totalWidth = it.runWidthSoFar(); |
| return FloatRect(point.x() + floorf(totalWidth - afterWidth), point.y(), roundf(totalWidth - beforeWidth) - floorf(totalWidth - afterWidth), h); |
| } |
| |
| return FloatRect(point.x() + floorf(beforeWidth), point.y(), roundf(afterWidth) - floorf(beforeWidth), h); |
| } |
| |
| float Font::getGlyphsAndAdvancesForComplexText(const TextRun& run, int from, int to, GlyphBuffer& glyphBuffer, ForTextEmphasisOrNot forTextEmphasis) const |
| { |
| if (forTextEmphasis) { |
| // FIXME: Add forTextEmphasis paremeter to UniscribeController and use it. |
| LOG_ERROR("Not implemented for text emphasis."); |
| return 0; |
| } |
| |
| UniscribeController controller(this, run); |
| controller.advance(from); |
| float beforeWidth = controller.runWidthSoFar(); |
| controller.advance(to, &glyphBuffer); |
| |
| if (glyphBuffer.isEmpty()) |
| return 0; |
| |
| float afterWidth = controller.runWidthSoFar(); |
| |
| if (run.rtl()) { |
| controller.advance(run.length()); |
| return controller.runWidthSoFar() - afterWidth; |
| } |
| return beforeWidth; |
| } |
| |
| void Font::drawComplexText(GraphicsContext* context, const TextRun& run, const FloatPoint& point, |
| int from, int to) const |
| { |
| // This glyph buffer holds our glyphs + advances + font data for each glyph. |
| GlyphBuffer glyphBuffer; |
| |
| float startX = point.x() + getGlyphsAndAdvancesForComplexText(run, from, 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, run, glyphBuffer, startPoint); |
| } |
| |
| void Font::drawEmphasisMarksForComplexText(GraphicsContext* context, const TextRun& run, const AtomicString& mark, const FloatPoint& point, int from, int to) const |
| { |
| GlyphBuffer glyphBuffer; |
| float initialAdvance = getGlyphsAndAdvancesForComplexText(run, from, to, glyphBuffer, ForTextEmphasis); |
| |
| if (glyphBuffer.isEmpty()) |
| return; |
| |
| drawEmphasisMarks(context, run, glyphBuffer, mark, FloatPoint(point.x() + initialAdvance, point.y())); |
| } |
| |
| float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const |
| { |
| UniscribeController controller(this, run, fallbackFonts); |
| controller.advance(run.length()); |
| 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.runWidthSoFar())); |
| } |
| return controller.runWidthSoFar(); |
| } |
| |
| int Font::offsetForPositionForComplexText(const TextRun& run, float xFloat, bool includePartialGlyphs) const |
| { |
| // FIXME: This truncation is not a problem for HTML, but only affects SVG, which passes floating-point numbers |
| // to Font::offsetForPosition(). Bug http://webkit.org/b/40673 tracks fixing this problem. |
| int x = static_cast<int>(xFloat); |
| |
| UniscribeController controller(this, run); |
| return controller.offsetForPosition(x, includePartialGlyphs); |
| } |
| |
| } |