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Side by Side Diff: Source/platform/image-decoders/ImageFrame.h

Issue 1312843006: Animated PNG implementation (Closed) Base URL: https://chromium.googlesource.com/chromium/blink.git@master
Patch Set: Created 5 years, 3 months ago
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1 /* 1 /*
2 * Copyright (C) 2006 Apple Computer, Inc. All rights reserved. 2 * Copyright (C) 2006 Apple Computer, Inc. All rights reserved.
3 * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved. 3 * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved.
4 * 4 *
5 * Redistribution and use in source and binary forms, with or without 5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions 6 * modification, are permitted provided that the following conditions
7 * are met: 7 * are met:
8 * 1. Redistributions of source code must retain the above copyright 8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer. 9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright 10 * 2. Redistributions in binary form must reproduce the above copyright
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171 } 171 }
172 172
173 *dest = SkPackARGB32NoCheck(a, r, g, b); 173 *dest = SkPackARGB32NoCheck(a, r, g, b);
174 } 174 }
175 175
176 static inline void setRGBARaw(PixelData* dest, unsigned r, unsigned g, unsig ned b, unsigned a) 176 static inline void setRGBARaw(PixelData* dest, unsigned r, unsigned g, unsig ned b, unsigned a)
177 { 177 {
178 *dest = SkPackARGB32NoCheck(a, r, g, b); 178 *dest = SkPackARGB32NoCheck(a, r, g, b);
179 } 179 }
180 180
181 inline void overRGBAPremultiply(PixelData* dest, unsigned r, unsigned g, uns igned b, unsigned a)
182 {
183 enum FractionControl { RoundFractionControl = 257 * 128 };
184
185 if (!a)
186 return;
187
188 if (a < 255) {
189 unsigned alpha = a * 257;
190 r = (r * alpha + RoundFractionControl) >> 16;
191 g = (g * alpha + RoundFractionControl) >> 16;
192 b = (b * alpha + RoundFractionControl) >> 16;
193 *dest = SkPMSrcOver(SkPackARGB32NoCheck(a, r, g, b), *dest);
194 } else {
195 *dest = SkPackARGB32NoCheck(a, r, g, b);
196 }
197 }
198
199 inline void overRGBARaw(PixelData* dest, unsigned r, unsigned g, unsigned b, unsigned a)
200 {
201 if (!a)
202 return;
203
204 unsigned aDest = SkGetPackedA32(*dest);
205 if (aDest && a < 255) {
206 unsigned u = a * 255;
207 unsigned v = (255 - a) * aDest;
208 unsigned alpha = u + v;
209 unsigned rDest = SkGetPackedR32(*dest);
210 unsigned gDest = SkGetPackedG32(*dest);
211 unsigned bDest = SkGetPackedB32(*dest);
212 a = (alpha + (alpha >> 8) + 1) >> 8;
213 r = (r * u + rDest * v) / alpha;
214 g = (g * u + gDest * v) / alpha;
215 b = (b * u + bDest * v) / alpha;
216 }
217 *dest = SkPackARGB32NoCheck(a, r, g, b);
218 }
219
181 // Notifies the SkBitmap if any pixels changed and resets the flag. 220 // Notifies the SkBitmap if any pixels changed and resets the flag.
182 inline void notifyBitmapIfPixelsChanged() 221 inline void notifyBitmapIfPixelsChanged()
183 { 222 {
184 if (m_pixelsChanged) 223 if (m_pixelsChanged)
185 m_bitmap.notifyPixelsChanged(); 224 m_bitmap.notifyPixelsChanged();
186 m_pixelsChanged = false; 225 m_pixelsChanged = false;
187 } 226 }
188 227
189 private: 228 private:
190 int width() const 229 int width() const
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214 // The frame that must be decoded before this frame can be decoded. 253 // The frame that must be decoded before this frame can be decoded.
215 // WTF::kNotFound if this frame doesn't require any previous frame. 254 // WTF::kNotFound if this frame doesn't require any previous frame.
216 // This is used by ImageDecoder::clearCacheExceptFrame(), and will never 255 // This is used by ImageDecoder::clearCacheExceptFrame(), and will never
217 // be read for image formats that do not have multiple frames. 256 // be read for image formats that do not have multiple frames.
218 size_t m_requiredPreviousFrameIndex; 257 size_t m_requiredPreviousFrameIndex;
219 }; 258 };
220 259
221 } // namespace blink 260 } // namespace blink
222 261
223 #endif 262 #endif
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