1 /*
2 * Copyright 2011 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 "SkBitmapDevice.h"
9 #include "SkCanvas.h"
10 #include "SkColorPriv.h"
11 #include "SkMathPriv.h"
12 #include "SkRegion.h"
13 #include "Test.h"
14
15 #if SK_SUPPORT_GPU
16 #include "GrContextFactory.h"
17 #include "SkGpuDevice.h"
18 #endif
19
20 static const int DEV_W = 100, DEV_H = 100;
21 static const SkIRect DEV_RECT = SkIRect::MakeWH(DEV_W, DEV_H);
22 static const SkRect DEV_RECT_S = SkRect::MakeWH(DEV_W * SK_Scalar1,
23 DEV_H * SK_Scalar1);
24
getCanvasColor(int x,int y)25 static SkPMColor getCanvasColor(int x, int y) {
26 SkASSERT(x >= 0 && x < DEV_W);
27 SkASSERT(y >= 0 && y < DEV_H);
28
29 U8CPU r = x;
30 U8CPU g = y;
31 U8CPU b = 0xc;
32
33 U8CPU a = 0xff;
34 switch ((x+y) % 5) {
35 case 0:
36 a = 0xff;
37 break;
38 case 1:
39 a = 0x80;
40 break;
41 case 2:
42 a = 0xCC;
43 break;
44 case 4:
45 a = 0x01;
46 break;
47 case 3:
48 a = 0x00;
49 break;
50 }
51 return SkPremultiplyARGBInline(a, r, g, b);
52 }
53
getBitmapColor(int x,int y,int w)54 static SkPMColor getBitmapColor(int x, int y, int w) {
55 int n = y * w + x;
56
57 U8CPU b = n & 0xff;
58 U8CPU g = (n >> 8) & 0xff;
59 U8CPU r = (n >> 16) & 0xff;
60 return SkPackARGB32(0xff, r, g , b);
61 }
62
convertToPMColor(SkColorType ct,SkAlphaType at,const uint32_t * addr,bool * doUnpremul)63 static SkPMColor convertToPMColor(SkColorType ct, SkAlphaType at, const uint32_t* addr,
64 bool* doUnpremul) {
65 *doUnpremul = (kUnpremul_SkAlphaType == at);
66
67 const uint8_t* c = reinterpret_cast<const uint8_t*>(addr);
68 U8CPU a,r,g,b;
69 switch (ct) {
70 case kBGRA_8888_SkColorType:
71 b = static_cast<U8CPU>(c[0]);
72 g = static_cast<U8CPU>(c[1]);
73 r = static_cast<U8CPU>(c[2]);
74 a = static_cast<U8CPU>(c[3]);
75 break;
76 case kRGBA_8888_SkColorType:
77 r = static_cast<U8CPU>(c[0]);
78 g = static_cast<U8CPU>(c[1]);
79 b = static_cast<U8CPU>(c[2]);
80 a = static_cast<U8CPU>(c[3]);
81 break;
82 default:
83 SkDEBUGFAIL("Unexpected colortype");
84 return 0;
85 }
86
87 if (*doUnpremul) {
88 r = SkMulDiv255Ceiling(r, a);
89 g = SkMulDiv255Ceiling(g, a);
90 b = SkMulDiv255Ceiling(b, a);
91 }
92 return SkPackARGB32(a, r, g, b);
93 }
94
fillCanvas(SkCanvas * canvas)95 static void fillCanvas(SkCanvas* canvas) {
96 static SkBitmap bmp;
97 if (bmp.isNull()) {
98 SkDEBUGCODE(bool alloc =) bmp.allocN32Pixels(DEV_W, DEV_H);
99 SkASSERT(alloc);
100 SkAutoLockPixels alp(bmp);
101 intptr_t pixels = reinterpret_cast<intptr_t>(bmp.getPixels());
102 for (int y = 0; y < DEV_H; ++y) {
103 for (int x = 0; x < DEV_W; ++x) {
104 SkPMColor* pixel = reinterpret_cast<SkPMColor*>(pixels + y * bmp.rowBytes() + x * bmp.bytesPerPixel());
105 *pixel = getCanvasColor(x, y);
106 }
107 }
108 }
109 canvas->save();
110 canvas->setMatrix(SkMatrix::I());
111 canvas->clipRect(DEV_RECT_S, SkRegion::kReplace_Op);
112 SkPaint paint;
113 paint.setXfermodeMode(SkXfermode::kSrc_Mode);
114 canvas->drawBitmap(bmp, 0, 0, &paint);
115 canvas->restore();
116 }
117
fillBitmap(SkBitmap * bitmap)118 static void fillBitmap(SkBitmap* bitmap) {
119 SkASSERT(bitmap->lockPixelsAreWritable());
120 SkAutoLockPixels alp(*bitmap);
121 int w = bitmap->width();
122 int h = bitmap->height();
123 intptr_t pixels = reinterpret_cast<intptr_t>(bitmap->getPixels());
124 for (int y = 0; y < h; ++y) {
125 for (int x = 0; x < w; ++x) {
126 SkPMColor* pixel = reinterpret_cast<SkPMColor*>(pixels + y * bitmap->rowBytes() + x * bitmap->bytesPerPixel());
127 *pixel = getBitmapColor(x, y, w);
128 }
129 }
130 }
131
checkPixel(SkPMColor a,SkPMColor b,bool didPremulConversion)132 static bool checkPixel(SkPMColor a, SkPMColor b, bool didPremulConversion) {
133 if (!didPremulConversion) {
134 return a == b;
135 }
136 int32_t aA = static_cast<int32_t>(SkGetPackedA32(a));
137 int32_t aR = static_cast<int32_t>(SkGetPackedR32(a));
138 int32_t aG = static_cast<int32_t>(SkGetPackedG32(a));
139 int32_t aB = SkGetPackedB32(a);
140
141 int32_t bA = static_cast<int32_t>(SkGetPackedA32(b));
142 int32_t bR = static_cast<int32_t>(SkGetPackedR32(b));
143 int32_t bG = static_cast<int32_t>(SkGetPackedG32(b));
144 int32_t bB = static_cast<int32_t>(SkGetPackedB32(b));
145
146 return aA == bA &&
147 SkAbs32(aR - bR) <= 1 &&
148 SkAbs32(aG - bG) <= 1 &&
149 SkAbs32(aB - bB) <= 1;
150 }
151
152 // checks the bitmap contains correct pixels after the readPixels
153 // if the bitmap was prefilled with pixels it checks that these weren't
154 // overwritten in the area outside the readPixels.
checkRead(skiatest::Reporter * reporter,const SkBitmap & bitmap,int x,int y,bool checkCanvasPixels,bool checkBitmapPixels)155 static bool checkRead(skiatest::Reporter* reporter,
156 const SkBitmap& bitmap,
157 int x, int y,
158 bool checkCanvasPixels,
159 bool checkBitmapPixels) {
160 SkASSERT(4 == bitmap.bytesPerPixel());
161 SkASSERT(!bitmap.isNull());
162 SkASSERT(checkCanvasPixels || checkBitmapPixels);
163
164 const SkColorType ct = bitmap.colorType();
165 const SkAlphaType at = bitmap.alphaType();
166
167 int bw = bitmap.width();
168 int bh = bitmap.height();
169
170 SkIRect srcRect = SkIRect::MakeXYWH(x, y, bw, bh);
171 SkIRect clippedSrcRect = DEV_RECT;
172 if (!clippedSrcRect.intersect(srcRect)) {
173 clippedSrcRect.setEmpty();
174 }
175 SkAutoLockPixels alp(bitmap);
176 for (int by = 0; by < bh; ++by) {
177 for (int bx = 0; bx < bw; ++bx) {
178 int devx = bx + srcRect.fLeft;
179 int devy = by + srcRect.fTop;
180
181 const uint32_t* pixel = bitmap.getAddr32(bx, by);
182
183 if (clippedSrcRect.contains(devx, devy)) {
184 if (checkCanvasPixels) {
185 SkPMColor canvasPixel = getCanvasColor(devx, devy);
186 bool didPremul;
187 SkPMColor pmPixel = convertToPMColor(ct, at, pixel, &didPremul);
188 bool check;
189 REPORTER_ASSERT(reporter, check = checkPixel(pmPixel, canvasPixel, didPremul));
190 if (!check) {
191 return false;
192 }
193 }
194 } else if (checkBitmapPixels) {
195 REPORTER_ASSERT(reporter, getBitmapColor(bx, by, bw) == *pixel);
196 if (getBitmapColor(bx, by, bw) != *pixel) {
197 return false;
198 }
199 }
200 }
201 }
202 return true;
203 }
204
205 enum BitmapInit {
206 kFirstBitmapInit = 0,
207
208 kNoPixels_BitmapInit = kFirstBitmapInit,
209 kTight_BitmapInit,
210 kRowBytes_BitmapInit,
211
212 kBitmapInitCnt
213 };
214
nextBMI(BitmapInit bmi)215 static BitmapInit nextBMI(BitmapInit bmi) {
216 int x = bmi;
217 return static_cast<BitmapInit>(++x);
218 }
219
init_bitmap(SkBitmap * bitmap,const SkIRect & rect,BitmapInit init,SkColorType ct,SkAlphaType at)220 static void init_bitmap(SkBitmap* bitmap, const SkIRect& rect, BitmapInit init, SkColorType ct,
221 SkAlphaType at) {
222 SkImageInfo info = SkImageInfo::Make(rect.width(), rect.height(), ct, at);
223 size_t rowBytes = 0;
224 bool alloc = true;
225 switch (init) {
226 case kNoPixels_BitmapInit:
227 alloc = false;
228 case kTight_BitmapInit:
229 break;
230 case kRowBytes_BitmapInit:
231 rowBytes = (info.width() + 16) * sizeof(SkPMColor);
232 break;
233 default:
234 SkASSERT(0);
235 break;
236 }
237
238 if (alloc) {
239 bitmap->allocPixels(info);
240 } else {
241 bitmap->setInfo(info, rowBytes);
242 }
243 }
244
DEF_GPUTEST(ReadPixels,reporter,factory)245 DEF_GPUTEST(ReadPixels, reporter, factory) {
246 const SkIRect testRects[] = {
247 // entire thing
248 DEV_RECT,
249 // larger on all sides
250 SkIRect::MakeLTRB(-10, -10, DEV_W + 10, DEV_H + 10),
251 // fully contained
252 SkIRect::MakeLTRB(DEV_W / 4, DEV_H / 4, 3 * DEV_W / 4, 3 * DEV_H / 4),
253 // outside top left
254 SkIRect::MakeLTRB(-10, -10, -1, -1),
255 // touching top left corner
256 SkIRect::MakeLTRB(-10, -10, 0, 0),
257 // overlapping top left corner
258 SkIRect::MakeLTRB(-10, -10, DEV_W / 4, DEV_H / 4),
259 // overlapping top left and top right corners
260 SkIRect::MakeLTRB(-10, -10, DEV_W + 10, DEV_H / 4),
261 // touching entire top edge
262 SkIRect::MakeLTRB(-10, -10, DEV_W + 10, 0),
263 // overlapping top right corner
264 SkIRect::MakeLTRB(3 * DEV_W / 4, -10, DEV_W + 10, DEV_H / 4),
265 // contained in x, overlapping top edge
266 SkIRect::MakeLTRB(DEV_W / 4, -10, 3 * DEV_W / 4, DEV_H / 4),
267 // outside top right corner
268 SkIRect::MakeLTRB(DEV_W + 1, -10, DEV_W + 10, -1),
269 // touching top right corner
270 SkIRect::MakeLTRB(DEV_W, -10, DEV_W + 10, 0),
271 // overlapping top left and bottom left corners
272 SkIRect::MakeLTRB(-10, -10, DEV_W / 4, DEV_H + 10),
273 // touching entire left edge
274 SkIRect::MakeLTRB(-10, -10, 0, DEV_H + 10),
275 // overlapping bottom left corner
276 SkIRect::MakeLTRB(-10, 3 * DEV_H / 4, DEV_W / 4, DEV_H + 10),
277 // contained in y, overlapping left edge
278 SkIRect::MakeLTRB(-10, DEV_H / 4, DEV_W / 4, 3 * DEV_H / 4),
279 // outside bottom left corner
280 SkIRect::MakeLTRB(-10, DEV_H + 1, -1, DEV_H + 10),
281 // touching bottom left corner
282 SkIRect::MakeLTRB(-10, DEV_H, 0, DEV_H + 10),
283 // overlapping bottom left and bottom right corners
284 SkIRect::MakeLTRB(-10, 3 * DEV_H / 4, DEV_W + 10, DEV_H + 10),
285 // touching entire left edge
286 SkIRect::MakeLTRB(0, DEV_H, DEV_W, DEV_H + 10),
287 // overlapping bottom right corner
288 SkIRect::MakeLTRB(3 * DEV_W / 4, 3 * DEV_H / 4, DEV_W + 10, DEV_H + 10),
289 // overlapping top right and bottom right corners
290 SkIRect::MakeLTRB(3 * DEV_W / 4, -10, DEV_W + 10, DEV_H + 10),
291 };
292
293 for (int dtype = 0; dtype < 3; ++dtype) {
294 int glCtxTypeCnt = 1;
295 #if SK_SUPPORT_GPU
296 if (0 != dtype) {
297 glCtxTypeCnt = GrContextFactory::kGLContextTypeCnt;
298 }
299 #endif
300 for (int glCtxType = 0; glCtxType < glCtxTypeCnt; ++glCtxType) {
301 SkAutoTUnref<SkBaseDevice> device;
302 if (0 == dtype) {
303 SkImageInfo info = SkImageInfo::MakeN32Premul(DEV_W, DEV_H);
304 device.reset(SkBitmapDevice::Create(info));
305 } else {
306 #if SK_SUPPORT_GPU
307 GrContextFactory::GLContextType type =
308 static_cast<GrContextFactory::GLContextType>(glCtxType);
309 if (!GrContextFactory::IsRenderingGLContext(type)) {
310 continue;
311 }
312 GrContext* context = factory->get(type);
313 if (NULL == context) {
314 continue;
315 }
316 GrTextureDesc desc;
317 desc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit;
318 desc.fWidth = DEV_W;
319 desc.fHeight = DEV_H;
320 desc.fConfig = kSkia8888_GrPixelConfig;
321 desc.fOrigin = 1 == dtype ? kBottomLeft_GrSurfaceOrigin
322 : kTopLeft_GrSurfaceOrigin;
323 GrAutoScratchTexture ast(context, desc, GrContext::kExact_ScratchTexMatch);
324 SkAutoTUnref<GrTexture> tex(ast.detach());
325 device.reset(new SkGpuDevice(context, tex));
326 #else
327 continue;
328 #endif
329 }
330 SkCanvas canvas(device);
331 fillCanvas(&canvas);
332
333 static const struct {
334 SkColorType fColorType;
335 SkAlphaType fAlphaType;
336 } gReadConfigs[] = {
337 { kRGBA_8888_SkColorType, kPremul_SkAlphaType },
338 { kRGBA_8888_SkColorType, kUnpremul_SkAlphaType },
339 { kBGRA_8888_SkColorType, kPremul_SkAlphaType },
340 { kBGRA_8888_SkColorType, kUnpremul_SkAlphaType },
341 };
342 for (size_t rect = 0; rect < SK_ARRAY_COUNT(testRects); ++rect) {
343 const SkIRect& srcRect = testRects[rect];
344 for (BitmapInit bmi = kFirstBitmapInit; bmi < kBitmapInitCnt; bmi = nextBMI(bmi)) {
345 for (size_t c = 0; c < SK_ARRAY_COUNT(gReadConfigs); ++c) {
346 SkBitmap bmp;
347 init_bitmap(&bmp, srcRect, bmi,
348 gReadConfigs[c].fColorType, gReadConfigs[c].fAlphaType);
349
350 // if the bitmap has pixels allocated before the readPixels,
351 // note that and fill them with pattern
352 bool startsWithPixels = !bmp.isNull();
353 if (startsWithPixels) {
354 fillBitmap(&bmp);
355 }
356 uint32_t idBefore = canvas.getDevice()->accessBitmap(false).getGenerationID();
357 bool success = canvas.readPixels(&bmp, srcRect.fLeft, srcRect.fTop);
358 uint32_t idAfter = canvas.getDevice()->accessBitmap(false).getGenerationID();
359
360 // we expect to succeed when the read isn't fully clipped
361 // out.
362 bool expectSuccess = SkIRect::Intersects(srcRect, DEV_RECT);
363 // determine whether we expected the read to succeed.
364 REPORTER_ASSERT(reporter, success == expectSuccess);
365 // read pixels should never change the gen id
366 REPORTER_ASSERT(reporter, idBefore == idAfter);
367
368 if (success || startsWithPixels) {
369 checkRead(reporter, bmp, srcRect.fLeft, srcRect.fTop,
370 success, startsWithPixels);
371 } else {
372 // if we had no pixels beforehand and the readPixels
373 // failed then our bitmap should still not have pixels
374 REPORTER_ASSERT(reporter, bmp.isNull());
375 }
376 }
377 // check the old webkit version of readPixels that clips the
378 // bitmap size
379 SkBitmap wkbmp;
380 bool success = canvas.readPixels(srcRect, &wkbmp);
381 SkIRect clippedRect = DEV_RECT;
382 if (clippedRect.intersect(srcRect)) {
383 REPORTER_ASSERT(reporter, success);
384 REPORTER_ASSERT(reporter, kN32_SkColorType == wkbmp.colorType());
385 REPORTER_ASSERT(reporter, kPremul_SkAlphaType == wkbmp.alphaType());
386 checkRead(reporter, wkbmp, clippedRect.fLeft,
387 clippedRect.fTop, true, false);
388 } else {
389 REPORTER_ASSERT(reporter, !success);
390 }
391 }
392 }
393 }
394 }
395 }
396