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 COMPUTER, 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 COMPUTER, 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 "FontFallbackList.h" 30 #include "GlyphBuffer.h" 31 #include "GraphicsContext.h" 32 #include "IntRect.h" 33 #include "SimpleFontData.h" 34 #include "UniscribeController.h" 35 #include <wtf/MathExtras.h> 36 37 namespace WebCore { 38 39 bool Font::canReturnFallbackFontsForComplexText() 40 { 41 return true; 42 } 43 44 FloatRect Font::selectionRectForComplexText(const TextRun& run, const IntPoint& point, int h, 45 int from, int to) const 46 { 47 UniscribeController it(this, run); 48 it.advance(from); 49 float beforeWidth = it.runWidthSoFar(); 50 it.advance(to); 51 float afterWidth = it.runWidthSoFar(); 52 53 // Using roundf() rather than ceilf() for the right edge as a compromise to ensure correct caret positioning 54 if (run.rtl()) { 55 it.advance(run.length()); 56 float totalWidth = it.runWidthSoFar(); 57 return FloatRect(point.x() + floorf(totalWidth - afterWidth), point.y(), roundf(totalWidth - beforeWidth) - floorf(totalWidth - afterWidth), h); 58 } 59 60 return FloatRect(point.x() + floorf(beforeWidth), point.y(), roundf(afterWidth) - floorf(beforeWidth), h); 61 } 62 63 void Font::drawComplexText(GraphicsContext* context, const TextRun& run, const FloatPoint& point, 64 int from, int to) const 65 { 66 // This glyph buffer holds our glyphs + advances + font data for each glyph. 67 GlyphBuffer glyphBuffer; 68 69 float startX = point.x(); 70 UniscribeController controller(this, run); 71 controller.advance(from); 72 float beforeWidth = controller.runWidthSoFar(); 73 controller.advance(to, &glyphBuffer); 74 75 // We couldn't generate any glyphs for the run. Give up. 76 if (glyphBuffer.isEmpty()) 77 return; 78 79 float afterWidth = controller.runWidthSoFar(); 80 81 if (run.rtl()) { 82 controller.advance(run.length()); 83 startX += controller.runWidthSoFar() - afterWidth; 84 } else 85 startX += beforeWidth; 86 87 // Draw the glyph buffer now at the starting point returned in startX. 88 FloatPoint startPoint(startX, point.y()); 89 drawGlyphBuffer(context, glyphBuffer, run, startPoint); 90 } 91 92 float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts) const 93 { 94 UniscribeController controller(this, run, fallbackFonts); 95 controller.advance(run.length()); 96 return controller.runWidthSoFar(); 97 } 98 99 int Font::offsetForPositionForComplexText(const TextRun& run, int x, bool includePartialGlyphs) const 100 { 101 UniscribeController controller(this, run); 102 return controller.offsetForPosition(x, includePartialGlyphs); 103 } 104 105 } 106
