1/* 2 * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#include "config.h" 27#include "Font.h" 28 29#include "FontGlyphs.h" 30#include "GlyphBuffer.h" 31#include "GraphicsContext.h" 32#include "IntRect.h" 33#include "LayoutRect.h" 34#include "Logging.h" 35#include "SimpleFontData.h" 36#include "TextRun.h" 37#include "UniscribeController.h" 38#include <wtf/MathExtras.h> 39 40using namespace std; 41 42namespace WebCore { 43 44bool Font::canReturnFallbackFontsForComplexText() 45{ 46 return true; 47} 48 49bool Font::canExpandAroundIdeographsInComplexText() 50{ 51 return false; 52} 53 54void Font::adjustSelectionRectForComplexText(const TextRun& run, LayoutRect& selectionRect, int from, int to) const 55{ 56 UniscribeController it(this, run); 57 it.advance(from); 58 float beforeWidth = it.runWidthSoFar(); 59 it.advance(to); 60 float afterWidth = it.runWidthSoFar(); 61 62 if (run.rtl()) { 63 it.advance(run.length()); 64 selectionRect.move(it.runWidthSoFar() - afterWidth, 0); 65 } else 66 selectionRect.move(beforeWidth, 0); 67 selectionRect.setWidth(afterWidth - beforeWidth); 68} 69 70float Font::getGlyphsAndAdvancesForComplexText(const TextRun& run, int from, int to, GlyphBuffer& glyphBuffer, ForTextEmphasisOrNot forTextEmphasis) const 71{ 72 if (forTextEmphasis) { 73 // FIXME: Add forTextEmphasis paremeter to UniscribeController and use it. 74 LOG_ERROR("Not implemented for text emphasis."); 75 return 0; 76 } 77 78 UniscribeController controller(this, run); 79 controller.advance(from); 80 float beforeWidth = controller.runWidthSoFar(); 81 controller.advance(to, &glyphBuffer); 82 83 if (glyphBuffer.isEmpty()) 84 return 0; 85 86 float afterWidth = controller.runWidthSoFar(); 87 88 if (run.rtl()) { 89 controller.advance(run.length()); 90 return controller.runWidthSoFar() - afterWidth; 91 } 92 return beforeWidth; 93} 94 95float Font::drawComplexText(GraphicsContext* context, const TextRun& run, const FloatPoint& point, int from, int to) const 96{ 97 // This glyph buffer holds our glyphs + advances + font data for each glyph. 98 GlyphBuffer glyphBuffer; 99 100 float startX = point.x() + getGlyphsAndAdvancesForComplexText(run, from, to, glyphBuffer); 101 102 // We couldn't generate any glyphs for the run. Give up. 103 if (glyphBuffer.isEmpty()) 104 return 0; 105 106 // Draw the glyph buffer now at the starting point returned in startX. 107 FloatPoint startPoint(startX, point.y()); 108 drawGlyphBuffer(context, run, glyphBuffer, startPoint); 109 return startPoint.x() - startX; 110} 111 112void Font::drawEmphasisMarksForComplexText(GraphicsContext* context, const TextRun& run, const AtomicString& mark, const FloatPoint& point, int from, int to) const 113{ 114 GlyphBuffer glyphBuffer; 115 float initialAdvance = getGlyphsAndAdvancesForComplexText(run, from, to, glyphBuffer, ForTextEmphasis); 116 117 if (glyphBuffer.isEmpty()) 118 return; 119 120 drawEmphasisMarks(context, run, glyphBuffer, mark, FloatPoint(point.x() + initialAdvance, point.y())); 121} 122 123float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const 124{ 125 UniscribeController controller(this, run, fallbackFonts); 126 controller.advance(run.length()); 127 if (glyphOverflow) { 128 glyphOverflow->top = max<int>(glyphOverflow->top, ceilf(-controller.minGlyphBoundingBoxY()) - (glyphOverflow->computeBounds ? 0 : fontMetrics().ascent())); 129 glyphOverflow->bottom = max<int>(glyphOverflow->bottom, ceilf(controller.maxGlyphBoundingBoxY()) - (glyphOverflow->computeBounds ? 0 : fontMetrics().descent())); 130 glyphOverflow->left = max<int>(0, ceilf(-controller.minGlyphBoundingBoxX())); 131 glyphOverflow->right = max<int>(0, ceilf(controller.maxGlyphBoundingBoxX() - controller.runWidthSoFar())); 132 } 133 return controller.runWidthSoFar(); 134} 135 136int Font::offsetForPositionForComplexText(const TextRun& run, float xFloat, bool includePartialGlyphs) const 137{ 138 // FIXME: This truncation is not a problem for HTML, but only affects SVG, which passes floating-point numbers 139 // to Font::offsetForPosition(). Bug http://webkit.org/b/40673 tracks fixing this problem. 140 int x = static_cast<int>(xFloat); 141 142 UniscribeController controller(this, run); 143 return controller.offsetForPosition(x, includePartialGlyphs); 144} 145 146} 147