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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: Created 6 years, 5 months ago
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1 #include "SkBitmap.h"
scroggo 2014/07/10 15:09:48 Could you add the copyright header as well?
reed1 2014/07/10 15:32:16 Done.
2 #include "SkCanvas.h"
1 #include "SkConfig8888.h" 3 #include "SkConfig8888.h"
2 #include "SkColorPriv.h" 4 #include "SkColorPriv.h"
5 #include "SkDither.h"
3 #include "SkMathPriv.h" 6 #include "SkMathPriv.h"
4 #include "SkUnPreMultiply.h" 7 #include "SkUnPreMultiply.h"
5 8
6 enum AlphaVerb { 9 enum AlphaVerb {
7 kNothing_AlphaVerb, 10 kNothing_AlphaVerb,
8 kPremul_AlphaVerb, 11 kPremul_AlphaVerb,
9 kUnpremul_AlphaVerb, 12 kUnpremul_AlphaVerb,
10 }; 13 };
11 14
12 template <bool doSwapRB, AlphaVerb doAlpha> uint32_t convert32(uint32_t c) { 15 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); 111 const uint32_t* srcP = static_cast<const uint32_t*>(fPixels);
109 size_t srcInc = fRowBytes >> 2; 112 size_t srcInc = fRowBytes >> 2;
110 size_t dstInc = dst->fRowBytes >> 2; 113 size_t dstInc = dst->fRowBytes >> 2;
111 for (int y = 0; y < height; ++y) { 114 for (int y = 0; y < height; ++y) {
112 proc(dstP, srcP, width); 115 proc(dstP, srcP, width);
113 dstP += dstInc; 116 dstP += dstInc;
114 srcP += srcInc; 117 srcP += srcInc;
115 } 118 }
116 return true; 119 return true;
117 } 120 }
121
122 static void rect_memcpy(void* dst, size_t dstRB, const void* src, size_t srcRB, size_t bytesPerRow,
123 int rowCount) {
124 SkASSERT(bytesPerRow <= srcRB);
125 SkASSERT(bytesPerRow <= dstRB);
126 for (int i = 0; i < rowCount; ++i) {
127 memcpy(dst, src, bytesPerRow);
128 dst = (char*)dst + dstRB;
129 src = (const char*)src + srcRB;
130 }
131 }
132
133 bool SkPixelInfo::CopyPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRB,
134 const SkImageInfo& srcInfo, const void* srcPixels, size_t srcRB,
135 SkColorTable* ctable) {
136 if (srcInfo.dimensions() != dstInfo.dimensions()) {
137 return false;
138 }
139
140 const int width = srcInfo.width();
141 const int height = srcInfo.height();
142
143 // Handle fancy alpha swizzling if both are ARGB32
144 if (4 == srcInfo.bytesPerPixel() && 4 == dstInfo.bytesPerPixel()) {
145 SkDstPixelInfo dstPI;
146 dstPI.fColorType = dstInfo.colorType();
147 dstPI.fAlphaType = dstInfo.alphaType();
148 dstPI.fPixels = dstPixels;
149 dstPI.fRowBytes = dstRB;
150
151 SkSrcPixelInfo srcPI;
152 srcPI.fColorType = srcInfo.colorType();
153 srcPI.fAlphaType = srcInfo.alphaType();
154 srcPI.fPixels = srcPixels;
155 srcPI.fRowBytes = srcRB;
156
157 return srcPI.convertPixelsTo(&dstPI, width, height);
158 }
159
160 // If they agree on colorType, then we ignore alphaType and just memcpy.
scroggo 2014/07/10 15:09:48 I'm not sure this is the correct behavior (it's al
reed1 2014/07/10 15:32:16 This is what we did in the old code for both copyT
161 // Note: we've already taken care of 32bit colortypes above.
162 if (srcInfo.colorType() == dstInfo.colorType()) {
163 switch (srcInfo.colorType()) {
164 case kRGB_565_SkColorType:
165 case kAlpha_8_SkColorType:
166 case kIndex_8_SkColorType:
167 break;
168 case kARGB_4444_SkColorType:
169 if (srcInfo.alphaType() != dstInfo.alphaType()) {
170 return false;
171 }
172 break;
173 default:
174 return false;
175 }
176 rect_memcpy(dstPixels, dstRB, srcPixels, srcRB, width * srcInfo.bytesPer Pixel(), height);
177 return true;
178 }
179
180 /*
181 * Begin section where we try to change colorTypes along the way. Not all c ombinations
182 * are supported.
183 */
184
185 // Can no longer draw directly into 4444, but we can manually wack it for a few combinations
scroggo 2014/07/10 15:09:48 whack*
reed1 2014/07/10 15:32:16 Done.
186 if (kARGB_4444_SkColorType == dstInfo.colorType() &&
187 (kN32_SkColorType == srcInfo.colorType() || kIndex_8_SkColorType == srcI nfo.colorType())) {
188 if (srcInfo.alphaType() == kUnpremul_SkAlphaType) {
189 // Our method for converting to 4444 assumes premultiplied.
190 return false;
191 }
192
193 const SkPMColor* table = NULL;
194 if (kIndex_8_SkColorType == srcInfo.colorType()) {
195 if (NULL == ctable) {
196 return false;
197 }
198 table = ctable->lockColors();
199 }
200
201 for (int y = 0; y < height; ++y) {
202 DITHER_4444_SCAN(y);
203 SkPMColor16* SK_RESTRICT dstRow = (SkPMColor16*)dstPixels;
204 if (table) {
205 const uint8_t* SK_RESTRICT srcRow = (const uint8_t*)srcPixels;
206 for (int x = 0; x < width; ++x) {
207 dstRow[x] = SkDitherARGB32To4444(table[srcRow[x]], DITHER_VA LUE(x));
208 }
209 } else {
210 const SkPMColor* SK_RESTRICT srcRow = (const SkPMColor*)srcPixel s;
211 for (int x = 0; x < width; ++x) {
212 dstRow[x] = SkDitherARGB32To4444(srcRow[x], DITHER_VALUE(x)) ;
213 }
214 }
215 dstPixels = (char*)dstPixels + dstRB;
216 srcPixels = (const char*)srcPixels + srcRB;
217 }
218
219 if (table) {
220 ctable->unlockColors();
221 }
222 return true;
223 }
224
225 if (dstInfo.alphaType() == kUnpremul_SkAlphaType) {
226 // We do not support drawing to unpremultiplied bitmaps.
227 return false;
228 }
229
230 // Final fall-back, draw with a canvas
231 //
232 // Always clear the dest in case one of the blitters accesses it
233 // TODO: switch the allocation of tmpDst to call sk_calloc_throw
234 {
235 SkBitmap bm;
236 if (!bm.installPixels(srcInfo, const_cast<void*>(srcPixels), srcRB, ctab le, NULL, NULL)) {
237 return false;
238 }
239 SkAutoTUnref<SkCanvas> canvas(SkCanvas::NewRasterDirect(dstInfo, dstPixe ls, dstRB));
240 if (NULL == canvas.get()) {
241 return false;
242 }
243
244 SkPaint paint;
245 paint.setDither(true);
246
247 canvas->clear(0);
248 canvas->drawBitmap(bm, 0, 0, &paint);
249 return true;
250 }
251 }
252
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