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| 1 /* | |
| 2 * Copyright (C) 2006, 2007 Apple Computer, Inc. | |
| 3 * Copyright (c) 2006, 2007, 2008, 2009, Google Inc. All rights reserved. | |
| 4 * | |
| 5 * Redistribution and use in source and binary forms, with or without | |
| 6 * modification, are permitted provided that the following conditions are | |
| 7 * met: | |
| 8 * | |
| 9 * * Redistributions of source code must retain the above copyright | |
| 10 * notice, this list of conditions and the following disclaimer. | |
| 11 * * Redistributions in binary form must reproduce the above | |
| 12 * copyright notice, this list of conditions and the following disclaimer | |
| 13 * in the documentation and/or other materials provided with the | |
| 14 * distribution. | |
| 15 * * Neither the name of Google Inc. nor the names of its | |
| 16 * contributors may be used to endorse or promote products derived from | |
| 17 * this software without specific prior written permission. | |
| 18 * | |
| 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 30 */ | |
| 31 | |
| 32 #include "config.h" | |
| 33 #include "core/platform/graphics/Font.h" | |
| 34 | |
| 35 #include "core/platform/graphics/FontFallbackList.h" | |
| 36 #include "core/platform/graphics/GraphicsContext.h" | |
| 37 #include "core/platform/graphics/SimpleFontData.h" | |
| 38 #include "core/platform/graphics/skia/SkiaFontWin.h" | |
| 39 #include "core/platform/graphics/win/FontPlatformDataWin.h" | |
| 40 #include "core/platform/graphics/win/UniscribeHelperTextRun.h" | |
| 41 #include "platform/fonts/GlyphBuffer.h" | |
| 42 #include "platform/NotImplemented.h" | |
| 43 | |
| 44 #include <windows.h> | |
| 45 | |
| 46 using namespace std; | |
| 47 | |
| 48 namespace WebCore { | |
| 49 | |
| 50 bool Font::canReturnFallbackFontsForComplexText() | |
| 51 { | |
| 52 return false; | |
| 53 } | |
| 54 | |
| 55 bool Font::canExpandAroundIdeographsInComplexText() | |
| 56 { | |
| 57 return false; | |
| 58 } | |
| 59 | |
| 60 void Font::drawGlyphs(GraphicsContext* graphicsContext, | |
| 61 const SimpleFontData* font, const GlyphBuffer& glyphBuffer, | |
| 62 unsigned from, unsigned numGlyphs, const FloatPoint& point, | |
| 63 const FloatRect& textRect) const | |
| 64 { | |
| 65 SkColor color = graphicsContext->effectiveFillColor(); | |
| 66 unsigned char alpha = SkColorGetA(color); | |
| 67 // Skip 100% transparent text; no need to draw anything. | |
| 68 if (!alpha && graphicsContext->strokeStyle() == NoStroke && !graphicsContext
->hasShadow()) | |
| 69 return; | |
| 70 | |
| 71 // We draw the glyphs in chunks to avoid having to do a heap allocation for | |
| 72 // the arrays of characters and advances. | |
| 73 const unsigned kMaxBufferLength = 256; | |
| 74 Vector<int, kMaxBufferLength> advances; | |
| 75 unsigned glyphIndex = 0; // The starting glyph of the current chunk. | |
| 76 | |
| 77 float horizontalOffset = point.x(); // The floating point offset of the left
side of the current glyph. | |
| 78 | |
| 79 #if ENABLE(OPENTYPE_VERTICAL) | |
| 80 const OpenTypeVerticalData* verticalData = font->verticalData(); | |
| 81 if (verticalData) { | |
| 82 Vector<FloatPoint, kMaxBufferLength> translations; | |
| 83 Vector<GOFFSET, kMaxBufferLength> offsets; | |
| 84 | |
| 85 // Skia doesn't have matrix for glyph coordinate space, so we rotate bac
k the CTM. | |
| 86 AffineTransform savedMatrix = graphicsContext->getCTM(); | |
| 87 graphicsContext->concatCTM(AffineTransform(0, -1, 1, 0, point.x(), point
.y())); | |
| 88 graphicsContext->concatCTM(AffineTransform(1, 0, 0, 1, -point.x(), -poin
t.y())); | |
| 89 | |
| 90 const FontMetrics& metrics = font->fontMetrics(); | |
| 91 SkScalar verticalOriginX = SkFloatToScalar(point.x() + metrics.floatAsce
nt() - metrics.floatAscent(IdeographicBaseline)); | |
| 92 while (glyphIndex < numGlyphs) { | |
| 93 // How many chars will be in this chunk? | |
| 94 unsigned curLen = std::min(kMaxBufferLength, numGlyphs - glyphIndex)
; | |
| 95 | |
| 96 const Glyph* glyphs = glyphBuffer.glyphs(from + glyphIndex); | |
| 97 translations.resize(curLen); | |
| 98 verticalData->getVerticalTranslationsForGlyphs(font, &glyphs[0], cur
Len, reinterpret_cast<float*>(&translations[0])); | |
| 99 // To position glyphs vertically, we use offsets instead of advances
. | |
| 100 advances.resize(curLen); | |
| 101 advances.fill(0); | |
| 102 offsets.resize(curLen); | |
| 103 float currentWidth = 0; | |
| 104 for (unsigned i = 0; i < curLen; ++i, ++glyphIndex) { | |
| 105 offsets[i].du = lroundf(translations[i].x()); | |
| 106 offsets[i].dv = -lroundf(currentWidth - translations[i].y()); | |
| 107 currentWidth += glyphBuffer.advanceAt(from + glyphIndex); | |
| 108 } | |
| 109 SkPoint origin; | |
| 110 origin.set(verticalOriginX, SkFloatToScalar(point.y() + horizontalOf
fset - point.x())); | |
| 111 horizontalOffset += currentWidth; | |
| 112 paintSkiaText(graphicsContext, font->platformData(), curLen, &glyphs
[0], &advances[0], &offsets[0], origin, SkRect(textRect)); | |
| 113 } | |
| 114 | |
| 115 graphicsContext->setCTM(savedMatrix); | |
| 116 return; | |
| 117 } | |
| 118 #endif | |
| 119 | |
| 120 // In order to round all offsets to the correct pixel boundary, this code ke
eps track of the absolute position | |
| 121 // of each glyph in floating point units and rounds to integer advances at t
he last possible moment. | |
| 122 | |
| 123 int lastHorizontalOffsetRounded = lroundf(horizontalOffset); // The rounded
offset of the left side of the last glyph rendered. | |
| 124 Vector<WORD, kMaxBufferLength> glyphs; | |
| 125 while (glyphIndex < numGlyphs) { | |
| 126 // How many chars will be in this chunk? | |
| 127 unsigned curLen = std::min(kMaxBufferLength, numGlyphs - glyphIndex); | |
| 128 glyphs.resize(curLen); | |
| 129 advances.resize(curLen); | |
| 130 | |
| 131 float currentWidth = 0; | |
| 132 for (unsigned i = 0; i < curLen; ++i, ++glyphIndex) { | |
| 133 glyphs[i] = glyphBuffer.glyphAt(from + glyphIndex); | |
| 134 horizontalOffset += glyphBuffer.advanceAt(from + glyphIndex); | |
| 135 advances[i] = lroundf(horizontalOffset) - lastHorizontalOffsetRounde
d; | |
| 136 lastHorizontalOffsetRounded += advances[i]; | |
| 137 currentWidth += glyphBuffer.advanceAt(from + glyphIndex); | |
| 138 | |
| 139 // Bug 26088 - very large positive or negative runs can fail to | |
| 140 // render so we clamp the size here. In the specs, negative | |
| 141 // letter-spacing is implementation-defined, so this should be | |
| 142 // fine, and it matches Safari's implementation. The call actually | |
| 143 // seems to crash if kMaxNegativeRun is set to somewhere around | |
| 144 // -32830, so we give ourselves a little breathing room. | |
| 145 const int maxNegativeRun = -32768; | |
| 146 const int maxPositiveRun = 32768; | |
| 147 if ((currentWidth + advances[i] < maxNegativeRun) || (currentWidth +
advances[i] > maxPositiveRun)) | |
| 148 advances[i] = 0; | |
| 149 } | |
| 150 | |
| 151 SkPoint origin = point; | |
| 152 origin.fX += SkFloatToScalar(horizontalOffset - point.x() - currentWidth
); | |
| 153 paintSkiaText(graphicsContext, font->platformData(), curLen, &glyphs[0],
&advances[0], 0, origin, SkRect(textRect)); | |
| 154 } | |
| 155 } | |
| 156 | |
| 157 FloatRect Font::selectionRectForComplexText(const TextRun& run, | |
| 158 const FloatPoint& point, | |
| 159 int h, | |
| 160 int from, | |
| 161 int to) const | |
| 162 { | |
| 163 UniscribeHelperTextRun state(run, *this); | |
| 164 float left = static_cast<float>(point.x() + state.characterToX(from)); | |
| 165 float right = static_cast<float>(point.x() + state.characterToX(to)); | |
| 166 | |
| 167 // If the text is RTL, left will actually be after right. | |
| 168 if (left < right) | |
| 169 return FloatRect(left, point.y(), | |
| 170 right - left, static_cast<float>(h)); | |
| 171 | |
| 172 return FloatRect(right, point.y(), | |
| 173 left - right, static_cast<float>(h)); | |
| 174 } | |
| 175 | |
| 176 void Font::drawComplexText(GraphicsContext* graphicsContext, | |
| 177 const TextRunPaintInfo& runInfo, | |
| 178 const FloatPoint& point) const | |
| 179 { | |
| 180 UniscribeHelperTextRun state(runInfo.run, *this); | |
| 181 | |
| 182 SkColor color = graphicsContext->effectiveFillColor(); | |
| 183 unsigned char alpha = SkColorGetA(color); | |
| 184 // Skip 100% transparent text; no need to draw anything. | |
| 185 if (!alpha && graphicsContext->strokeStyle() == NoStroke) | |
| 186 return; | |
| 187 | |
| 188 HDC hdc = 0; | |
| 189 // Uniscribe counts the coordinates from the upper left, while WebKit uses | |
| 190 // the baseline, so we have to subtract off the ascent. | |
| 191 state.draw(graphicsContext, primaryFont()->platformData(), hdc, lroundf(poin
t.x()), lroundf(point.y() - fontMetrics().ascent()), runInfo.bounds, runInfo.fro
m, runInfo.to); | |
| 192 } | |
| 193 | |
| 194 void Font::drawEmphasisMarksForComplexText(GraphicsContext* /* context */, const
TextRunPaintInfo& /* runInfo */, const AtomicString& /* mark */, const FloatPoi
nt& /* point */) const | |
| 195 { | |
| 196 notImplemented(); | |
| 197 } | |
| 198 | |
| 199 float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFon
tData*>* /* fallbackFonts */, GlyphOverflow* /* glyphOverflow */) const | |
| 200 { | |
| 201 UniscribeHelperTextRun state(run, *this); | |
| 202 return static_cast<float>(state.width()); | |
| 203 } | |
| 204 | |
| 205 int Font::offsetForPositionForComplexText(const TextRun& run, float xFloat, | |
| 206 bool includePartialGlyphs) const | |
| 207 { | |
| 208 // FIXME: This truncation is not a problem for HTML, but only affects SVG, w
hich passes floating-point numbers | |
| 209 // to Font::offsetForPosition(). Bug http://webkit.org/b/40673 tracks fixing
this problem. | |
| 210 int x = static_cast<int>(xFloat); | |
| 211 | |
| 212 // Mac code ignores includePartialGlyphs, and they don't know what it's | |
| 213 // supposed to do, so we just ignore it as well. | |
| 214 UniscribeHelperTextRun state(run, *this); | |
| 215 int charIndex = state.xToCharacter(x); | |
| 216 | |
| 217 // XToCharacter will return -1 if the position is before the first | |
| 218 // character (we get called like this sometimes). | |
| 219 if (charIndex < 0) | |
| 220 charIndex = 0; | |
| 221 return charIndex; | |
| 222 } | |
| 223 | |
| 224 } // namespace WebCore | |
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Chromium Code Reviews
Issue 99103006:
Moving GraphicsContext and dependencies from core to platform. (Closed)
Base URL: svn://svn.chromium.org/blink/trunk