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Side by Side Diff: src/codec/SkPngCodec.cpp

Issue 2098583002: SkMatrix44 clarifications and clean-ups (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: Created 4 years, 6 months ago
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1 /* 1 /*
2 * Copyright 2015 Google Inc. 2 * Copyright 2015 Google Inc.
3 * 3 *
4 * Use of this source code is governed by a BSD-style license that can be 4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file. 5 * found in the LICENSE file.
6 */ 6 */
7 7
8 #include "SkBitmap.h" 8 #include "SkBitmap.h"
9 #include "SkCodecPriv.h" 9 #include "SkCodecPriv.h"
10 #include "SkColorPriv.h" 10 #include "SkColorPriv.h"
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223 // FIXME (msarett): Here we are treating XYZ values as D50 even though t he color 223 // FIXME (msarett): Here we are treating XYZ values as D50 even though t he color
224 // temperature is unspecified. I suspect that this ass umption 224 // temperature is unspecified. I suspect that this ass umption
225 // is most often ok, but we could also calculate the co lor 225 // is most often ok, but we could also calculate the co lor
226 // temperature (D value) and then convert the XYZ to D5 0. Maybe 226 // temperature (D value) and then convert the XYZ to D5 0. Maybe
227 // we should add a new constructor to SkColorSpace that accepts 227 // we should add a new constructor to SkColorSpace that accepts
228 // XYZ with D-Unkown? 228 // XYZ with D-Unkown?
229 for (int i = 0; i < 9; i++) { 229 for (int i = 0; i < 9; i++) {
230 toXYZD50[i] = png_fixed_point_to_float(XYZ[i]); 230 toXYZD50[i] = png_fixed_point_to_float(XYZ[i]);
231 } 231 }
232 SkMatrix44 mat(SkMatrix44::kUninitialized_Constructor); 232 SkMatrix44 mat(SkMatrix44::kUninitialized_Constructor);
233 mat.set3x3ColMajorf(toXYZD50); 233 mat.set3x3RowMajorf(toXYZD50);
234 234
235 if (PNG_INFO_gAMA == png_get_gAMA_fixed(png_ptr, info_ptr, &gamma)) { 235 if (PNG_INFO_gAMA == png_get_gAMA_fixed(png_ptr, info_ptr, &gamma)) {
236 float value = png_inverted_fixed_point_to_float(gamma); 236 float value = png_inverted_fixed_point_to_float(gamma);
237 gammas[0] = value; 237 gammas[0] = value;
238 gammas[1] = value; 238 gammas[1] = value;
239 gammas[2] = value; 239 gammas[2] = value;
240 240
241 return SkColorSpace_Base::NewRGB(gammas, mat); 241 return SkColorSpace_Base::NewRGB(gammas, mat);
242 } 242 }
243 243
244 // Default to sRGB gamma if the image has color space information, 244 // Default to sRGB gamma if the image has color space information,
245 // but does not specify gamma. 245 // but does not specify gamma.
246 return SkColorSpace::NewRGB(SkColorSpace::kSRGB_GammaNamed, mat); 246 return SkColorSpace::NewRGB(SkColorSpace::kSRGB_GammaNamed, mat);
247 } 247 }
248 248
249 // Last, check for gamma. 249 // Last, check for gamma.
250 if (PNG_INFO_gAMA == png_get_gAMA_fixed(png_ptr, info_ptr, &gamma)) { 250 if (PNG_INFO_gAMA == png_get_gAMA_fixed(png_ptr, info_ptr, &gamma)) {
251 251
252 // Set the gammas. 252 // Set the gammas.
253 float value = png_inverted_fixed_point_to_float(gamma); 253 float value = png_inverted_fixed_point_to_float(gamma);
254 gammas[0] = value; 254 gammas[0] = value;
255 gammas[1] = value; 255 gammas[1] = value;
256 gammas[2] = value; 256 gammas[2] = value;
257 257
258 // Since there is no cHRM, we will guess sRGB gamut. 258 // Since there is no cHRM, we will guess sRGB gamut.
259 SkMatrix44 mat(SkMatrix44::kUninitialized_Constructor); 259 SkMatrix44 mat(SkMatrix44::kUninitialized_Constructor);
260 mat.set3x3ColMajorf(gSRGB_toXYZD50); 260 mat.set3x3RowMajorf(gSRGB_toXYZD50);
261 261
262 return SkColorSpace_Base::NewRGB(gammas, mat); 262 return SkColorSpace_Base::NewRGB(gammas, mat);
263 } 263 }
264 264
265 #endif // LIBPNG >= 1.6 265 #endif // LIBPNG >= 1.6
266 266
267 // Report that there is no color space information in the PNG. SkPngCodec i s currently 267 // Report that there is no color space information in the PNG. SkPngCodec i s currently
268 // implemented to guess sRGB in this case. 268 // implemented to guess sRGB in this case.
269 return nullptr; 269 return nullptr;
270 } 270 }
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809 SkCodec* outCodec; 809 SkCodec* outCodec;
810 if (read_header(stream, chunkReader, &outCodec, nullptr, nullptr)) { 810 if (read_header(stream, chunkReader, &outCodec, nullptr, nullptr)) {
811 // Codec has taken ownership of the stream. 811 // Codec has taken ownership of the stream.
812 SkASSERT(outCodec); 812 SkASSERT(outCodec);
813 streamDeleter.release(); 813 streamDeleter.release();
814 return outCodec; 814 return outCodec;
815 } 815 }
816 816
817 return nullptr; 817 return nullptr;
818 } 818 }
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