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1 /* | |
2 * Copyright (C) 2006, 2007, 2008, 2009 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 "AffineTransform.h" | |
30 #include "FloatConversion.h" | |
31 #include "GlyphBuffer.h" | |
32 #include "GraphicsContext.h" | |
33 #include "IntRect.h" | |
34 #include "SimpleFontData.h" | |
35 #include "UniscribeController.h" | |
36 #include "WebCoreTextRenderer.h" | |
37 #include <ApplicationServices/ApplicationServices.h> | |
38 #include <WebKitSystemInterface/WebKitSystemInterface.h> | |
39 #include <wtf/MathExtras.h> | |
40 | |
41 namespace WebCore { | |
42 | |
43 const int syntheticObliqueAngle = 14; | |
44 | |
45 static inline CGFloat toCGFloat(FIXED f) | |
46 { | |
47 return f.value + f.fract / CGFloat(65536.0); | |
48 } | |
49 | |
50 static CGPathRef createPathForGlyph(HDC hdc, Glyph glyph) | |
51 { | |
52 CGMutablePathRef path = CGPathCreateMutable(); | |
53 | |
54 static const MAT2 identity = { 0, 1, 0, 0, 0, 0, 0, 1 }; | |
55 GLYPHMETRICS glyphMetrics; | |
56 // GGO_NATIVE matches the outline perfectly when Windows font smoothing is o
ff. | |
57 // GGO_NATIVE | GGO_UNHINTED does not match perfectly either when Windows fo
nt smoothing is on or off. | |
58 DWORD outlineLength = GetGlyphOutline(hdc, glyph, GGO_GLYPH_INDEX | GGO_NATI
VE, &glyphMetrics, 0, 0, &identity); | |
59 ASSERT(outlineLength >= 0); | |
60 if (outlineLength < 0) | |
61 return path; | |
62 | |
63 Vector<UInt8> outline(outlineLength); | |
64 GetGlyphOutline(hdc, glyph, GGO_GLYPH_INDEX | GGO_NATIVE, &glyphMetrics, out
lineLength, outline.data(), &identity); | |
65 | |
66 unsigned offset = 0; | |
67 while (offset < outlineLength) { | |
68 LPTTPOLYGONHEADER subpath = reinterpret_cast<LPTTPOLYGONHEADER>(outline.
data() + offset); | |
69 ASSERT(subpath->dwType == TT_POLYGON_TYPE); | |
70 if (subpath->dwType != TT_POLYGON_TYPE) | |
71 return path; | |
72 | |
73 CGPathMoveToPoint(path, 0, toCGFloat(subpath->pfxStart.x), toCGFloat(sub
path->pfxStart.y)); | |
74 | |
75 unsigned subpathOffset = sizeof(*subpath); | |
76 while (subpathOffset < subpath->cb) { | |
77 LPTTPOLYCURVE segment = reinterpret_cast<LPTTPOLYCURVE>(reinterpret_
cast<UInt8*>(subpath) + subpathOffset); | |
78 switch (segment->wType) { | |
79 case TT_PRIM_LINE: | |
80 for (unsigned i = 0; i < segment->cpfx; i++) | |
81 CGPathAddLineToPoint(path, 0, toCGFloat(segment->apfx[i]
.x), toCGFloat(segment->apfx[i].y)); | |
82 break; | |
83 | |
84 case TT_PRIM_QSPLINE: | |
85 for (unsigned i = 0; i < segment->cpfx; i++) { | |
86 CGFloat x = toCGFloat(segment->apfx[i].x); | |
87 CGFloat y = toCGFloat(segment->apfx[i].y); | |
88 CGFloat cpx; | |
89 CGFloat cpy; | |
90 | |
91 if (i == segment->cpfx - 2) { | |
92 cpx = toCGFloat(segment->apfx[i + 1].x); | |
93 cpy = toCGFloat(segment->apfx[i + 1].y); | |
94 i++; | |
95 } else { | |
96 cpx = (toCGFloat(segment->apfx[i].x) + toCGFloat(seg
ment->apfx[i + 1].x)) / 2; | |
97 cpy = (toCGFloat(segment->apfx[i].y) + toCGFloat(seg
ment->apfx[i + 1].y)) / 2; | |
98 } | |
99 | |
100 CGPathAddQuadCurveToPoint(path, 0, x, y, cpx, cpy); | |
101 } | |
102 break; | |
103 | |
104 case TT_PRIM_CSPLINE: | |
105 for (unsigned i = 0; i < segment->cpfx; i += 3) { | |
106 CGFloat cp1x = toCGFloat(segment->apfx[i].x); | |
107 CGFloat cp1y = toCGFloat(segment->apfx[i].y); | |
108 CGFloat cp2x = toCGFloat(segment->apfx[i + 1].x); | |
109 CGFloat cp2y = toCGFloat(segment->apfx[i + 1].y); | |
110 CGFloat x = toCGFloat(segment->apfx[i + 2].x); | |
111 CGFloat y = toCGFloat(segment->apfx[i + 2].y); | |
112 | |
113 CGPathAddCurveToPoint(path, 0, cp1x, cp1y, cp2x, cp2y, x
, y); | |
114 } | |
115 break; | |
116 | |
117 default: | |
118 ASSERT_NOT_REACHED(); | |
119 return path; | |
120 } | |
121 | |
122 subpathOffset += sizeof(*segment) + (segment->cpfx - 1) * sizeof(seg
ment->apfx[0]); | |
123 } | |
124 CGPathCloseSubpath(path); | |
125 offset += subpath->cb; | |
126 } | |
127 return path; | |
128 } | |
129 | |
130 void Font::drawGlyphs(GraphicsContext* graphicsContext, const SimpleFontData* fo
nt, const GlyphBuffer& glyphBuffer, | |
131 int from, int numGlyphs, const FloatPoint& point) const | |
132 { | |
133 CGContextRef cgContext = graphicsContext->platformContext(); | |
134 bool shouldUseFontSmoothing = WebCoreShouldUseFontSmoothing(); | |
135 | |
136 switch(fontDescription().fontSmoothing()) { | |
137 case Antialiased: { | |
138 graphicsContext->setShouldAntialias(true); | |
139 shouldUseFontSmoothing = false; | |
140 break; | |
141 } | |
142 case SubpixelAntialiased: { | |
143 graphicsContext->setShouldAntialias(true); | |
144 shouldUseFontSmoothing = true; | |
145 break; | |
146 } | |
147 case NoSmoothing: { | |
148 graphicsContext->setShouldAntialias(false); | |
149 shouldUseFontSmoothing = false; | |
150 break; | |
151 } | |
152 case AutoSmoothing: { | |
153 // For the AutoSmooth case, don't do anything! Keep the default settings
. | |
154 break; | |
155 } | |
156 default: | |
157 ASSERT_NOT_REACHED(); | |
158 } | |
159 | |
160 uint32_t oldFontSmoothingStyle = wkSetFontSmoothingStyle(cgContext, shouldUs
eFontSmoothing); | |
161 | |
162 const FontPlatformData& platformData = font->platformData(); | |
163 | |
164 CGContextSetFont(cgContext, platformData.cgFont()); | |
165 | |
166 CGAffineTransform matrix = CGAffineTransformIdentity; | |
167 matrix.b = -matrix.b; | |
168 matrix.d = -matrix.d; | |
169 | |
170 if (platformData.syntheticOblique()) { | |
171 static float skew = -tanf(syntheticObliqueAngle * piFloat / 180.0f); | |
172 matrix = CGAffineTransformConcat(matrix, CGAffineTransformMake(1, 0, ske
w, 1, 0, 0)); | |
173 } | |
174 | |
175 CGContextSetTextMatrix(cgContext, matrix); | |
176 | |
177 // Uniscribe gives us offsets to help refine the positioning of combining gl
yphs. | |
178 FloatSize translation = glyphBuffer.offsetAt(from); | |
179 | |
180 CGContextSetFontSize(cgContext, platformData.size()); | |
181 wkSetCGContextFontRenderingStyle(cgContext, font->isSystemFont(), false, fon
t->platformData().useGDI()); | |
182 | |
183 FloatSize shadowOffset; | |
184 float shadowBlur; | |
185 Color shadowColor; | |
186 ColorSpace shadowColorSpace; | |
187 graphicsContext->getShadow(shadowOffset, shadowBlur, shadowColor, shadowColo
rSpace); | |
188 | |
189 bool hasSimpleShadow = graphicsContext->textDrawingMode() == TextModeFill &&
shadowColor.isValid() && !shadowBlur && (!graphicsContext->shadowsIgnoreTransfo
rms() || graphicsContext->getCTM().isIdentityOrTranslationOrFlipped()); | |
190 if (hasSimpleShadow) { | |
191 // Paint simple shadows ourselves instead of relying on CG shadows, to a
void losing subpixel antialiasing. | |
192 graphicsContext->clearShadow(); | |
193 Color fillColor = graphicsContext->fillColor(); | |
194 Color shadowFillColor(shadowColor.red(), shadowColor.green(), shadowColo
r.blue(), shadowColor.alpha() * fillColor.alpha() / 255); | |
195 graphicsContext->setFillColor(shadowFillColor, ColorSpaceDeviceRGB); | |
196 float shadowTextX = point.x() + translation.width() + shadowOffset.width
(); | |
197 // If shadows are ignoring transforms, then we haven't applied the Y coo
rdinate flip yet, so down is negative. | |
198 float shadowTextY = point.y() + translation.height() + shadowOffset.heig
ht() * (graphicsContext->shadowsIgnoreTransforms() ? -1 : 1); | |
199 CGContextSetTextPosition(cgContext, shadowTextX, shadowTextY); | |
200 CGContextShowGlyphsWithAdvances(cgContext, glyphBuffer.glyphs(from), sta
tic_cast<const CGSize*>(glyphBuffer.advances(from)), numGlyphs); | |
201 if (font->syntheticBoldOffset()) { | |
202 CGContextSetTextPosition(cgContext, point.x() + translation.width()
+ shadowOffset.width() + font->syntheticBoldOffset(), point.y() + translation.he
ight() + shadowOffset.height()); | |
203 CGContextShowGlyphsWithAdvances(cgContext, glyphBuffer.glyphs(from),
static_cast<const CGSize*>(glyphBuffer.advances(from)), numGlyphs); | |
204 } | |
205 graphicsContext->setFillColor(fillColor, ColorSpaceDeviceRGB); | |
206 } | |
207 | |
208 CGContextSetTextPosition(cgContext, point.x() + translation.width(), point.y
() + translation.height()); | |
209 CGContextShowGlyphsWithAdvances(cgContext, glyphBuffer.glyphs(from), static_
cast<const CGSize*>(glyphBuffer.advances(from)), numGlyphs); | |
210 if (font->syntheticBoldOffset()) { | |
211 CGContextSetTextPosition(cgContext, point.x() + translation.width() + fo
nt->syntheticBoldOffset(), point.y() + translation.height()); | |
212 CGContextShowGlyphsWithAdvances(cgContext, glyphBuffer.glyphs(from), sta
tic_cast<const CGSize*>(glyphBuffer.advances(from)), numGlyphs); | |
213 } | |
214 | |
215 if (hasSimpleShadow) | |
216 graphicsContext->setShadow(shadowOffset, shadowBlur, shadowColor, ColorS
paceDeviceRGB); | |
217 | |
218 wkRestoreFontSmoothingStyle(cgContext, oldFontSmoothingStyle); | |
219 } | |
220 | |
221 } | |
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