Chromium Code Reviews
chromiumcodereview-hr@appspot.gserviceaccount.com (chromiumcodereview-hr) | Please choose your nickname with Settings | Help | Chromium Project | Gerrit Changes | Sign out
(63)

Side by Side Diff: src/core/SkConfig8888.cpp

Issue 377303002: add readPixels() to SkBitmap (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: fix spelling in comment Created 6 years, 5 months ago
Use n/p to move between diff chunks; N/P to move between comments. Draft comments are only viewable by you.
Jump to:
View unified diff | Download patch
« no previous file with comments | « src/core/SkConfig8888.h ('k') | tests/BitmapCopyTest.cpp » ('j') | no next file with comments »
Toggle Intra-line Diffs ('i') | Expand Comments ('e') | Collapse Comments ('c') | Show Comments Hide Comments ('s')
OLDNEW
1 /*
2 * Copyright 2014 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "SkBitmap.h"
9 #include "SkCanvas.h"
1 #include "SkConfig8888.h" 10 #include "SkConfig8888.h"
2 #include "SkColorPriv.h" 11 #include "SkColorPriv.h"
12 #include "SkDither.h"
3 #include "SkMathPriv.h" 13 #include "SkMathPriv.h"
4 #include "SkUnPreMultiply.h" 14 #include "SkUnPreMultiply.h"
5 15
6 enum AlphaVerb { 16 enum AlphaVerb {
7 kNothing_AlphaVerb, 17 kNothing_AlphaVerb,
8 kPremul_AlphaVerb, 18 kPremul_AlphaVerb,
9 kUnpremul_AlphaVerb, 19 kUnpremul_AlphaVerb,
10 }; 20 };
11 21
12 template <bool doSwapRB, AlphaVerb doAlpha> uint32_t convert32(uint32_t c) { 22 template <bool doSwapRB, AlphaVerb doAlpha> uint32_t convert32(uint32_t c) {
(...skipping 95 matching lines...) Expand 10 before | Expand all | Expand 10 after
108 const uint32_t* srcP = static_cast<const uint32_t*>(fPixels); 118 const uint32_t* srcP = static_cast<const uint32_t*>(fPixels);
109 size_t srcInc = fRowBytes >> 2; 119 size_t srcInc = fRowBytes >> 2;
110 size_t dstInc = dst->fRowBytes >> 2; 120 size_t dstInc = dst->fRowBytes >> 2;
111 for (int y = 0; y < height; ++y) { 121 for (int y = 0; y < height; ++y) {
112 proc(dstP, srcP, width); 122 proc(dstP, srcP, width);
113 dstP += dstInc; 123 dstP += dstInc;
114 srcP += srcInc; 124 srcP += srcInc;
115 } 125 }
116 return true; 126 return true;
117 } 127 }
128
129 static void rect_memcpy(void* dst, size_t dstRB, const void* src, size_t srcRB, size_t bytesPerRow,
130 int rowCount) {
131 SkASSERT(bytesPerRow <= srcRB);
132 SkASSERT(bytesPerRow <= dstRB);
133 for (int i = 0; i < rowCount; ++i) {
134 memcpy(dst, src, bytesPerRow);
135 dst = (char*)dst + dstRB;
136 src = (const char*)src + srcRB;
137 }
138 }
139
140 bool SkPixelInfo::CopyPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRB,
141 const SkImageInfo& srcInfo, const void* srcPixels, size_t srcRB,
142 SkColorTable* ctable) {
143 if (srcInfo.dimensions() != dstInfo.dimensions()) {
144 return false;
145 }
146
147 const int width = srcInfo.width();
148 const int height = srcInfo.height();
149
150 // Handle fancy alpha swizzling if both are ARGB32
151 if (4 == srcInfo.bytesPerPixel() && 4 == dstInfo.bytesPerPixel()) {
152 SkDstPixelInfo dstPI;
153 dstPI.fColorType = dstInfo.colorType();
154 dstPI.fAlphaType = dstInfo.alphaType();
155 dstPI.fPixels = dstPixels;
156 dstPI.fRowBytes = dstRB;
157
158 SkSrcPixelInfo srcPI;
159 srcPI.fColorType = srcInfo.colorType();
160 srcPI.fAlphaType = srcInfo.alphaType();
161 srcPI.fPixels = srcPixels;
162 srcPI.fRowBytes = srcRB;
163
164 return srcPI.convertPixelsTo(&dstPI, width, height);
165 }
166
167 // If they agree on colorType and the alphaTypes are compatible, then we jus t memcpy.
168 // Note: we've already taken care of 32bit colortypes above.
169 if (srcInfo.colorType() == dstInfo.colorType()) {
170 switch (srcInfo.colorType()) {
171 case kRGB_565_SkColorType:
172 case kAlpha_8_SkColorType:
173 break;
174 case kIndex_8_SkColorType:
175 case kARGB_4444_SkColorType:
176 if (srcInfo.alphaType() != dstInfo.alphaType()) {
177 return false;
178 }
179 break;
180 default:
181 return false;
182 }
183 rect_memcpy(dstPixels, dstRB, srcPixels, srcRB, width * srcInfo.bytesPer Pixel(), height);
184 return true;
185 }
186
187 /*
188 * Begin section where we try to change colorTypes along the way. Not all c ombinations
189 * are supported.
190 */
191
192 // Can no longer draw directly into 4444, but we can manually whack it for a few combinations
193 if (kARGB_4444_SkColorType == dstInfo.colorType() &&
194 (kN32_SkColorType == srcInfo.colorType() || kIndex_8_SkColorType == srcI nfo.colorType())) {
195 if (srcInfo.alphaType() == kUnpremul_SkAlphaType) {
196 // Our method for converting to 4444 assumes premultiplied.
197 return false;
198 }
199
200 const SkPMColor* table = NULL;
201 if (kIndex_8_SkColorType == srcInfo.colorType()) {
202 if (NULL == ctable) {
203 return false;
204 }
205 table = ctable->lockColors();
206 }
207
208 for (int y = 0; y < height; ++y) {
209 DITHER_4444_SCAN(y);
210 SkPMColor16* SK_RESTRICT dstRow = (SkPMColor16*)dstPixels;
211 if (table) {
212 const uint8_t* SK_RESTRICT srcRow = (const uint8_t*)srcPixels;
213 for (int x = 0; x < width; ++x) {
214 dstRow[x] = SkDitherARGB32To4444(table[srcRow[x]], DITHER_VA LUE(x));
215 }
216 } else {
217 const SkPMColor* SK_RESTRICT srcRow = (const SkPMColor*)srcPixel s;
218 for (int x = 0; x < width; ++x) {
219 dstRow[x] = SkDitherARGB32To4444(srcRow[x], DITHER_VALUE(x)) ;
220 }
221 }
222 dstPixels = (char*)dstPixels + dstRB;
223 srcPixels = (const char*)srcPixels + srcRB;
224 }
225
226 if (table) {
227 ctable->unlockColors();
228 }
229 return true;
230 }
231
232 if (dstInfo.alphaType() == kUnpremul_SkAlphaType) {
233 // We do not support drawing to unpremultiplied bitmaps.
234 return false;
235 }
236
237 // Final fall-back, draw with a canvas
238 //
239 // Always clear the dest in case one of the blitters accesses it
240 // TODO: switch the allocation of tmpDst to call sk_calloc_throw
241 {
242 SkBitmap bm;
243 if (!bm.installPixels(srcInfo, const_cast<void*>(srcPixels), srcRB, ctab le, NULL, NULL)) {
244 return false;
245 }
246 SkAutoTUnref<SkCanvas> canvas(SkCanvas::NewRasterDirect(dstInfo, dstPixe ls, dstRB));
247 if (NULL == canvas.get()) {
248 return false;
249 }
250
251 SkPaint paint;
252 paint.setDither(true);
253
254 canvas->clear(0);
255 canvas->drawBitmap(bm, 0, 0, &paint);
256 return true;
257 }
258 }
259
OLDNEW
« no previous file with comments | « src/core/SkConfig8888.h ('k') | tests/BitmapCopyTest.cpp » ('j') | no next file with comments »

Powered by Google App Engine
This is Rietveld 408576698