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| 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 "Logging.h" | |
| 34 #include "SimpleFontData.h" | |
| 35 #include "TextRun.h" | |
| 36 #include "UniscribeController.h" | |
| 37 #include <wtf/MathExtras.h> | |
| 38 | |
| 39 using namespace std; | |
| 40 | |
| 41 namespace WebCore { | |
| 42 | |
| 43 bool Font::canReturnFallbackFontsForComplexText() | |
| 44 { | |
| 45 return true; | |
| 46 } | |
| 47 | |
| 48 bool Font::canExpandAroundIdeographsInComplexText() | |
| 49 { | |
| 50 return false; | |
| 51 } | |
| 52 | |
| 53 FloatRect Font::selectionRectForComplexText(const TextRun& run, const FloatPoint
& point, int h, | |
| 54 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 // Using roundf() rather than ceilf() for the right edge as a compromise to
ensure correct caret positioning | |
| 63 if (run.rtl()) { | |
| 64 it.advance(run.length()); | |
| 65 float totalWidth = it.runWidthSoFar(); | |
| 66 return FloatRect(point.x() + floorf(totalWidth - afterWidth), point.y(),
roundf(totalWidth - beforeWidth) - floorf(totalWidth - afterWidth), h); | |
| 67 } | |
| 68 | |
| 69 return FloatRect(point.x() + floorf(beforeWidth), point.y(), roundf(afterWid
th) - floorf(beforeWidth), h); | |
| 70 } | |
| 71 | |
| 72 float Font::getGlyphsAndAdvancesForComplexText(const TextRun& run, int from, int
to, GlyphBuffer& glyphBuffer, ForTextEmphasisOrNot forTextEmphasis) const | |
| 73 { | |
| 74 if (forTextEmphasis) { | |
| 75 // FIXME: Add forTextEmphasis paremeter to UniscribeController and use i
t. | |
| 76 LOG_ERROR("Not implemented for text emphasis."); | |
| 77 return 0; | |
| 78 } | |
| 79 | |
| 80 UniscribeController controller(this, run); | |
| 81 controller.advance(from); | |
| 82 float beforeWidth = controller.runWidthSoFar(); | |
| 83 controller.advance(to, &glyphBuffer); | |
| 84 | |
| 85 if (glyphBuffer.isEmpty()) | |
| 86 return 0; | |
| 87 | |
| 88 float afterWidth = controller.runWidthSoFar(); | |
| 89 | |
| 90 if (run.rtl()) { | |
| 91 controller.advance(run.length()); | |
| 92 return controller.runWidthSoFar() - afterWidth; | |
| 93 } | |
| 94 return beforeWidth; | |
| 95 } | |
| 96 | |
| 97 void Font::drawComplexText(GraphicsContext* context, const TextRun& run, const F
loatPoint& point, | |
| 98 int from, int to) const | |
| 99 { | |
| 100 // This glyph buffer holds our glyphs + advances + font data for each glyph. | |
| 101 GlyphBuffer glyphBuffer; | |
| 102 | |
| 103 float startX = point.x() + getGlyphsAndAdvancesForComplexText(run, from, to,
glyphBuffer); | |
| 104 | |
| 105 // We couldn't generate any glyphs for the run. Give up. | |
| 106 if (glyphBuffer.isEmpty()) | |
| 107 return; | |
| 108 | |
| 109 // Draw the glyph buffer now at the starting point returned in startX. | |
| 110 FloatPoint startPoint(startX, point.y()); | |
| 111 drawGlyphBuffer(context, run, glyphBuffer, startPoint); | |
| 112 } | |
| 113 | |
| 114 void Font::drawEmphasisMarksForComplexText(GraphicsContext* context, const TextR
un& run, const AtomicString& mark, const FloatPoint& point, int from, int to) co
nst | |
| 115 { | |
| 116 GlyphBuffer glyphBuffer; | |
| 117 float initialAdvance = getGlyphsAndAdvancesForComplexText(run, from, to, gly
phBuffer, ForTextEmphasis); | |
| 118 | |
| 119 if (glyphBuffer.isEmpty()) | |
| 120 return; | |
| 121 | |
| 122 drawEmphasisMarks(context, run, glyphBuffer, mark, FloatPoint(point.x() + in
itialAdvance, point.y())); | |
| 123 } | |
| 124 | |
| 125 float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFon
tData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const | |
| 126 { | |
| 127 UniscribeController controller(this, run, fallbackFonts); | |
| 128 controller.advance(run.length()); | |
| 129 if (glyphOverflow) { | |
| 130 glyphOverflow->top = max<int>(glyphOverflow->top, ceilf(-controller.minG
lyphBoundingBoxY()) - (glyphOverflow->computeBounds ? 0 : fontMetrics().ascent()
)); | |
| 131 glyphOverflow->bottom = max<int>(glyphOverflow->bottom, ceilf(controller
.maxGlyphBoundingBoxY()) - (glyphOverflow->computeBounds ? 0 : fontMetrics().de
scent())); | |
| 132 glyphOverflow->left = max<int>(0, ceilf(-controller.minGlyphBoundingBoxX
())); | |
| 133 glyphOverflow->right = max<int>(0, ceilf(controller.maxGlyphBoundingBoxX
() - controller.runWidthSoFar())); | |
| 134 } | |
| 135 return controller.runWidthSoFar(); | |
| 136 } | |
| 137 | |
| 138 int Font::offsetForPositionForComplexText(const TextRun& run, float xFloat, bool
includePartialGlyphs) const | |
| 139 { | |
| 140 // FIXME: This truncation is not a problem for HTML, but only affects SVG, w
hich passes floating-point numbers | |
| 141 // to Font::offsetForPosition(). Bug http://webkit.org/b/40673 tracks fixing
this problem. | |
| 142 int x = static_cast<int>(xFloat); | |
| 143 | |
| 144 UniscribeController controller(this, run); | |
| 145 return controller.offsetForPosition(x, includePartialGlyphs); | |
| 146 } | |
| 147 | |
| 148 } | |
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