1 /* 2 * Copyright (C) 2007 Kevin Ollivier. 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 "NotImplemented.h" 34 #include "SimpleFontData.h" 35 36 #if OS(WINDOWS) 37 #include "UniscribeController.h" 38 #endif 39 40 #include <wx/dcclient.h> 41 #include "fontprops.h" 42 #include "non-kerned-drawing.h" 43 44 namespace WebCore { 45 46 bool Font::canReturnFallbackFontsForComplexText() 47 { 48 #if OS(WINDOWS) 49 return true; 50 #else 51 return false; 52 #endif 53 } 54 55 void Font::drawGlyphs(GraphicsContext* graphicsContext, const SimpleFontData* font, const GlyphBuffer& glyphBuffer, 56 int from, int numGlyphs, const FloatPoint& point) const 57 { 58 // prepare DC 59 Color color = graphicsContext->fillColor(); 60 61 // We can't use wx drawing methods on Win/Linux because they automatically kern text 62 // so we've created a function with platform dependent drawing implementations that 63 // will hopefully be folded into wx once the API has solidified. 64 // see platform/wx/wxcode/<platform> for the implementations. 65 drawTextWithSpacing(graphicsContext, font, color, glyphBuffer, from, numGlyphs, point); 66 } 67 68 FloatRect Font::selectionRectForComplexText(const TextRun& run, const IntPoint& point, int h, int from, int to) const 69 { 70 #if OS(WINDOWS) 71 UniscribeController it(this, run); 72 it.advance(from); 73 float beforeWidth = it.runWidthSoFar(); 74 it.advance(to); 75 float afterWidth = it.runWidthSoFar(); 76 77 // Using roundf() rather than ceilf() for the right edge as a compromise to ensure correct caret positioning 78 if (run.rtl()) { 79 it.advance(run.length()); 80 float totalWidth = it.runWidthSoFar(); 81 return FloatRect(point.x() + floorf(totalWidth - afterWidth), point.y(), roundf(totalWidth - beforeWidth) - floorf(totalWidth - afterWidth), h); 82 } 83 84 return FloatRect(point.x() + floorf(beforeWidth), point.y(), roundf(afterWidth) - floorf(beforeWidth), h); 85 #else 86 notImplemented(); 87 return FloatRect(); 88 #endif 89 } 90 91 void Font::drawComplexText(GraphicsContext* context, const TextRun& run, const FloatPoint& point, int from, int to) const 92 { 93 #if OS(WINDOWS) 94 // This glyph buffer holds our glyphs + advances + font data for each glyph. 95 GlyphBuffer glyphBuffer; 96 97 float startX = point.x(); 98 UniscribeController controller(this, run); 99 controller.advance(from); 100 float beforeWidth = controller.runWidthSoFar(); 101 controller.advance(to, &glyphBuffer); 102 103 // We couldn't generate any glyphs for the run. Give up. 104 if (glyphBuffer.isEmpty()) 105 return; 106 107 float afterWidth = controller.runWidthSoFar(); 108 109 if (run.rtl()) { 110 controller.advance(run.length()); 111 startX += controller.runWidthSoFar() - afterWidth; 112 } else 113 startX += beforeWidth; 114 115 // Draw the glyph buffer now at the starting point returned in startX. 116 FloatPoint startPoint(startX, point.y()); 117 drawGlyphBuffer(context, glyphBuffer, run, startPoint); 118 #else 119 notImplemented(); 120 #endif 121 } 122 123 124 float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts) const 125 { 126 #if OS(WINDOWS) 127 UniscribeController controller(this, run, fallbackFonts); 128 controller.advance(run.length()); 129 return controller.runWidthSoFar(); 130 #else 131 notImplemented(); 132 return 0; 133 #endif 134 } 135 136 int Font::offsetForPositionForComplexText(const TextRun& run, int x, bool includePartialGlyphs) const 137 { 138 #if OS(WINDOWS) 139 UniscribeController controller(this, run); 140 return controller.offsetForPosition(x, includePartialGlyphs); 141 #else 142 notImplemented(); 143 return 0; 144 #endif 145 } 146 } 147