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Side by Side Diff: src/core/SkBitmapDevice.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
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1 /* 1 /*
2 * Copyright 2013 Google Inc. 2 * Copyright 2013 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 "SkBitmapDevice.h" 8 #include "SkBitmapDevice.h"
9 #include "SkConfig8888.h" 9 #include "SkConfig8888.h"
10 #include "SkDraw.h" 10 #include "SkDraw.h"
(...skipping 123 matching lines...) Expand 10 before | Expand all | Expand 10 after
134 134
135 void* SkBitmapDevice::onAccessPixels(SkImageInfo* info, size_t* rowBytes) { 135 void* SkBitmapDevice::onAccessPixels(SkImageInfo* info, size_t* rowBytes) {
136 if (fBitmap.getPixels()) { 136 if (fBitmap.getPixels()) {
137 *info = fBitmap.info(); 137 *info = fBitmap.info();
138 *rowBytes = fBitmap.rowBytes(); 138 *rowBytes = fBitmap.rowBytes();
139 return fBitmap.getPixels(); 139 return fBitmap.getPixels();
140 } 140 }
141 return NULL; 141 return NULL;
142 } 142 }
143 143
144 static void rect_memcpy(void* dst, size_t dstRB, const void* src, size_t srcRB, size_t bytesPerRow,
145 int rowCount) {
146 SkASSERT(bytesPerRow <= srcRB);
147 SkASSERT(bytesPerRow <= dstRB);
148 for (int i = 0; i < rowCount; ++i) {
149 memcpy(dst, src, bytesPerRow);
150 dst = (char*)dst + dstRB;
151 src = (const char*)src + srcRB;
152 }
153 }
154
155 #include "SkConfig8888.h" 144 #include "SkConfig8888.h"
156 145
157 static bool copy_pixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstR owBytes,
158 const SkImageInfo& srcInfo, const void* srcPixels, size_ t srcRowBytes) {
159 if (srcInfo.dimensions() != dstInfo.dimensions()) {
160 return false;
161 }
162 if (4 == srcInfo.bytesPerPixel() && 4 == dstInfo.bytesPerPixel()) {
163 SkDstPixelInfo dstPI;
164 dstPI.fColorType = dstInfo.colorType();
165 dstPI.fAlphaType = dstInfo.alphaType();
166 dstPI.fPixels = dstPixels;
167 dstPI.fRowBytes = dstRowBytes;
168
169 SkSrcPixelInfo srcPI;
170 srcPI.fColorType = srcInfo.colorType();
171 srcPI.fAlphaType = srcInfo.alphaType();
172 srcPI.fPixels = srcPixels;
173 srcPI.fRowBytes = srcRowBytes;
174
175 return srcPI.convertPixelsTo(&dstPI, srcInfo.width(), srcInfo.height());
176 }
177 if (srcInfo.colorType() == dstInfo.colorType()) {
178 switch (srcInfo.colorType()) {
179 case kRGB_565_SkColorType:
180 case kAlpha_8_SkColorType:
181 break;
182 case kARGB_4444_SkColorType:
183 if (srcInfo.alphaType() != dstInfo.alphaType()) {
184 return false;
185 }
186 break;
187 default:
188 return false;
189 }
190 rect_memcpy(dstPixels, dstRowBytes, srcPixels, srcRowBytes,
191 srcInfo.width() * srcInfo.bytesPerPixel(), srcInfo.height()) ;
192 }
193 // TODO: add support for more conversions as needed
194 return false;
195 }
196
197 bool SkBitmapDevice::onWritePixels(const SkImageInfo& srcInfo, const void* srcPi xels, 146 bool SkBitmapDevice::onWritePixels(const SkImageInfo& srcInfo, const void* srcPi xels,
198 size_t srcRowBytes, int x, int y) { 147 size_t srcRowBytes, int x, int y) {
199 // since we don't stop creating un-pixeled devices yet, check for no pixels here 148 // since we don't stop creating un-pixeled devices yet, check for no pixels here
200 if (NULL == fBitmap.getPixels()) { 149 if (NULL == fBitmap.getPixels()) {
201 return false; 150 return false;
202 } 151 }
203 152
204 SkImageInfo dstInfo = fBitmap.info(); 153 SkImageInfo dstInfo = fBitmap.info();
205 dstInfo.fWidth = srcInfo.width(); 154 dstInfo.fWidth = srcInfo.width();
206 dstInfo.fHeight = srcInfo.height(); 155 dstInfo.fHeight = srcInfo.height();
207 156
208 void* dstPixels = fBitmap.getAddr(x, y); 157 void* dstPixels = fBitmap.getAddr(x, y);
209 size_t dstRowBytes = fBitmap.rowBytes(); 158 size_t dstRowBytes = fBitmap.rowBytes();
210 159
211 if (copy_pixels(dstInfo, dstPixels, dstRowBytes, srcInfo, srcPixels, srcRowB ytes)) { 160 if (SkPixelInfo::CopyPixels(dstInfo, dstPixels, dstRowBytes, srcInfo, srcPix els, srcRowBytes)) {
212 fBitmap.notifyPixelsChanged(); 161 fBitmap.notifyPixelsChanged();
213 return true; 162 return true;
214 } 163 }
215 return false; 164 return false;
216 } 165 }
217 166
218 bool SkBitmapDevice::onReadPixels(const SkImageInfo& dstInfo, void* dstPixels, s ize_t dstRowBytes, 167 bool SkBitmapDevice::onReadPixels(const SkImageInfo& dstInfo, void* dstPixels, s ize_t dstRowBytes,
219 int x, int y) { 168 int x, int y) {
220 // since we don't stop creating un-pixeled devices yet, check for no pixels here 169 return fBitmap.readPixels(dstInfo, dstPixels, dstRowBytes, x, y);
221 if (NULL == fBitmap.getPixels()) {
222 return false;
223 }
224
225 SkImageInfo srcInfo = fBitmap.info();
226
227 // perhaps can relax these in the future
228 if (4 != dstInfo.bytesPerPixel()) {
229 return false;
230 }
231 if (4 != srcInfo.bytesPerPixel()) {
232 return false;
233 }
234
235 srcInfo.fWidth = dstInfo.width();
236 srcInfo.fHeight = dstInfo.height();
237
238 const void* srcPixels = fBitmap.getAddr(x, y);
239 const size_t srcRowBytes = fBitmap.rowBytes();
240
241 return copy_pixels(dstInfo, dstPixels, dstRowBytes, srcInfo, srcPixels, srcR owBytes);
242 } 170 }
243 171
244 /////////////////////////////////////////////////////////////////////////////// 172 ///////////////////////////////////////////////////////////////////////////////
245 173
246 void SkBitmapDevice::drawPaint(const SkDraw& draw, const SkPaint& paint) { 174 void SkBitmapDevice::drawPaint(const SkDraw& draw, const SkPaint& paint) {
247 draw.drawPaint(paint); 175 draw.drawPaint(paint);
248 } 176 }
249 177
250 void SkBitmapDevice::drawPoints(const SkDraw& draw, SkCanvas::PointMode mode, si ze_t count, 178 void SkBitmapDevice::drawPoints(const SkDraw& draw, SkCanvas::PointMode mode, si ze_t count,
251 const SkPoint pts[], const SkPaint& paint) { 179 const SkPoint pts[], const SkPaint& paint) {
(...skipping 202 matching lines...) Expand 10 before | Expand all | Expand 10 after
454 paint.getStyle() != SkPaint::kFill_Style || 382 paint.getStyle() != SkPaint::kFill_Style ||
455 !SkXfermode::IsMode(paint.getXfermode(), SkXfermode::kSrcOver_Mode)) { 383 !SkXfermode::IsMode(paint.getXfermode(), SkXfermode::kSrcOver_Mode)) {
456 // turn off lcd 384 // turn off lcd
457 flags->fFlags = paint.getFlags() & ~SkPaint::kLCDRenderText_Flag; 385 flags->fFlags = paint.getFlags() & ~SkPaint::kLCDRenderText_Flag;
458 flags->fHinting = paint.getHinting(); 386 flags->fHinting = paint.getHinting();
459 return true; 387 return true;
460 } 388 }
461 // we're cool with the paint as is 389 // we're cool with the paint as is
462 return false; 390 return false;
463 } 391 }
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