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