1 /*
2 * Copyright 2018 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 "gm.h"
9
10 #include "SkColorSpace.h"
11 #include "SkColorSpaceXformSteps.h"
12 #include "SkDashPathEffect.h"
13 #include "SkFont.h"
14 #include "SkGradientShader.h"
15 #include "SkString.h"
16
nearly_equal(SkColor4f x,SkColor4f y)17 static bool nearly_equal(SkColor4f x, SkColor4f y) {
18 const float K = 0.01f;
19 return fabsf(x.fR - y.fR) < K
20 && fabsf(x.fG - y.fG) < K
21 && fabsf(x.fB - y.fB) < K
22 && fabsf(x.fA - y.fA) < K;
23 }
24
fmt(SkColor4f c)25 static SkString fmt(SkColor4f c) {
26 return SkStringPrintf("%.2g %.2g %.2g %.2g", c.fR, c.fG, c.fB, c.fA);
27 }
28
transform(SkColor4f c,SkColorSpace * src,SkColorSpace * dst)29 static SkColor4f transform(SkColor4f c, SkColorSpace* src, SkColorSpace* dst) {
30 SkColorSpaceXformSteps(src, kUnpremul_SkAlphaType,
31 dst, kUnpremul_SkAlphaType).apply(c.vec());
32 return c;
33 }
34
compare_pixel(const char * label,SkCanvas * canvas,int x,int y,SkColor4f color,SkColorSpace * cs)35 static void compare_pixel(const char* label,
36 SkCanvas* canvas, int x, int y,
37 SkColor4f color, SkColorSpace* cs) {
38 SkPaint paint;
39 SkFont font;
40 auto canvas_cs = canvas->imageInfo().refColorSpace();
41
42 // I'm not really sure if this makes things easier or harder to follow,
43 // but we sniff the canvas to grab its current y-translate, so that (x,y)
44 // can be written in sort of chunk-relative terms.
45 const SkMatrix& m = canvas->getTotalMatrix();
46 SkASSERT(m.isTranslate());
47 SkScalar dy = m.getTranslateY();
48 SkASSERT(dy == (int)dy);
49 y += (int)dy;
50
51 SkBitmap bm;
52 bm.allocPixels(SkImageInfo::Make(1,1, kRGBA_F32_SkColorType, kUnpremul_SkAlphaType, canvas_cs));
53 if (!canvas->readPixels(bm, x,y)) {
54 MarkGMGood(canvas, 140,40);
55 canvas->drawString("can't readPixels() on this canvas :(", 100,20, font, paint);
56 return;
57 }
58
59 SkColor4f pixel;
60 memcpy(&pixel, bm.getAddr(0,0), sizeof(pixel));
61
62 SkColor4f expected = transform(color,cs, canvas_cs.get());
63 if (canvas->imageInfo().colorType() < kRGBA_F16_SkColorType) {
64 // We can't expect normalized formats to hold values outside [0,1].
65 for (int i = 0; i < 4; ++i) {
66 expected[i] = SkTPin(expected[i], 0.0f, 1.0f);
67 }
68 }
69 if (canvas->imageInfo().colorType() == kGray_8_SkColorType) {
70 // Drawing into Gray8 is known to be maybe-totally broken.
71 // TODO: update expectation here to be {lum,lum,lum,1} if we fix Gray8.
72 expected = SkColor4f{NAN, NAN, NAN, 1};
73 }
74
75 if (nearly_equal(pixel, expected)) {
76 MarkGMGood(canvas, 140,40);
77 } else {
78 MarkGMBad(canvas, 140,40);
79 }
80
81 struct {
82 const char* label;
83 SkColor4f color;
84 } lines[] = {
85 {"Pixel:" , pixel },
86 {"Expected:", expected},
87 };
88
89 SkAutoCanvasRestore saveRestore(canvas, true);
90 canvas->drawString(label, 80,20, font, paint);
91 for (auto l : lines) {
92 canvas->translate(0,20);
93 canvas->drawString(l.label, 80,20, font, paint);
94 canvas->drawString(fmt(l.color).c_str(), 140,20, font, paint);
95 }
96 }
97
98 DEF_SIMPLE_GM(p3, canvas, 450, 1300) {
99 auto p3 = SkColorSpace::MakeRGB(SkNamedTransferFn::kSRGB, SkNamedGamut::kDCIP3);
100 auto srgb = SkColorSpace::MakeSRGB();
101
__anon45bf74810202(SkColor4f c) 102 auto p3_to_srgb = [&](SkColor4f c) {
103 SkPaint p;
104 p.setColor4f(c, p3.get());
105 return p.getColor4f();
106 };
107
108 // Draw a P3 red rectangle and check the corner.
109 {
110 SkPaint paint;
111 paint.setColor4f({1,0,0,1}, p3.get());
112
113 canvas->drawRect({10,10,70,70}, paint);
114 compare_pixel("drawRect P3 red ",
115 canvas, 10,10,
116 {1,0,0,1}, p3.get());
117 }
118
119 canvas->translate(0,80);
120
121 // Draw a P3 red bitmap, using a draw.
122 {
123 SkBitmap bm;
124 bm.allocPixels(SkImageInfo::Make(60,60, kRGBA_F16_SkColorType, kPremul_SkAlphaType, p3));
125
126 SkPaint paint;
127 paint.setColor4f({1,0,0,1}, p3.get());
128 SkCanvas{bm}.drawPaint(paint);
129
130 canvas->drawBitmap(bm, 10,10);
131 compare_pixel("drawBitmap P3 red, from drawPaint",
132 canvas, 10,10,
133 {1,0,0,1}, p3.get());
134 }
135
136 canvas->translate(0,80);
137
138 // Draw a P3 red bitmap, using SkBitmap::eraseColor().
139 {
140 SkBitmap bm;
141 bm.allocPixels(SkImageInfo::Make(60,60, kRGBA_F16_SkColorType, kPremul_SkAlphaType, p3));
142
143 bm.eraseColor(0xffff0000/*in P3*/);
144
145 canvas->drawBitmap(bm, 10,10);
146 compare_pixel("drawBitmap P3 red, from SkBitmap::eraseColor()",
147 canvas, 10,10,
148 {1,0,0,1}, p3.get());
149 }
150
151 canvas->translate(0,80);
152
153 // Draw a P3 red bitmap, using SkPixmap::erase().
154 {
155 SkBitmap bm;
156 bm.allocPixels(SkImageInfo::Make(60,60, kRGBA_F16_SkColorType, kPremul_SkAlphaType, p3));
157
158 // At the moment only SkPixmap has an erase() that takes an SkColor4f.
159 SkPixmap pm;
160 SkAssertResult(bm.peekPixels(&pm));
161 SkAssertResult(pm.erase({1,0,0,1} /*in p3*/));
162
163 canvas->drawBitmap(bm, 10,10);
164 compare_pixel("drawBitmap P3 red, from SkPixmap::erase",
165 canvas, 10,10,
166 {1,0,0,1}, p3.get());
167 }
168
169 canvas->translate(0,80);
170
171 // Draw a P3 red bitmap wrapped in a shader, using SkPixmap::erase().
172 {
173 SkBitmap bm;
174 bm.allocPixels(SkImageInfo::Make(60,60, kRGBA_F16_SkColorType, kPremul_SkAlphaType, p3));
175
176 // At the moment only SkPixmap has an erase() that takes an SkColor4f.
177 SkPixmap pm;
178 SkAssertResult(bm.peekPixels(&pm));
179 SkAssertResult(pm.erase({1,0,0,1} /*in p3*/));
180
181 SkPaint paint;
182 paint.setShader(SkShader::MakeBitmapShader(bm, SkShader::kRepeat_TileMode,
183 SkShader::kRepeat_TileMode));
184
185 canvas->drawRect({10,10,70,70}, paint);
186 compare_pixel("drawBitmapAsShader P3 red, from SkPixmap::erase",
187 canvas, 10,10,
188 {1,0,0,1}, p3.get());
189 }
190
191 canvas->translate(0,80);
192
193 // Draw a gradient from P3 red to P3 green interpolating in unpremul P3, checking the corners.
194 {
195
196 SkPoint points[] = {{10.5,10.5}, {69.5,69.5}};
197 SkColor4f colors[] = {{1,0,0,1}, {0,1,0,1}};
198
199 SkPaint paint;
200 paint.setShader(SkGradientShader::MakeLinear(points, colors, p3,
201 nullptr, SK_ARRAY_COUNT(colors),
202 SkShader::kClamp_TileMode));
203 canvas->drawRect({10,10,70,70}, paint);
204 canvas->save();
205 compare_pixel("UPM P3 gradient, P3 red",
206 canvas, 10,10,
207 {1,0,0,1}, p3.get());
208
209 canvas->translate(180, 0);
210
211 compare_pixel("UPM P3 gradient, P3 green",
212 canvas, 69,69,
213 {0,1,0,1}, p3.get());
214 canvas->restore();
215 }
216
217 canvas->translate(0,80);
218
219 // Draw a gradient from P3 red to P3 green interpolating in premul P3, checking the corners.
220 {
221
222 SkPoint points[] = {{10.5,10.5}, {69.5,69.5}};
223 SkColor4f colors[] = {{1,0,0,1}, {0,1,0,1}};
224
225 SkPaint paint;
226 paint.setShader(
227 SkGradientShader::MakeLinear(points, colors, p3,
228 nullptr, SK_ARRAY_COUNT(colors),
229 SkShader::kClamp_TileMode,
230 SkGradientShader::kInterpolateColorsInPremul_Flag,
231 nullptr/*local matrix*/));
232 canvas->drawRect({10,10,70,70}, paint);
233 canvas->save();
234 compare_pixel("PM P3 gradient, P3 red",
235 canvas, 10,10,
236 {1,0,0,1}, p3.get());
237
238 canvas->translate(180, 0);
239
240 compare_pixel("PM P3 gradient, P3 green",
241 canvas, 69,69,
242 {0,1,0,1}, p3.get());
243 canvas->restore();
244 }
245
246 canvas->translate(0,80);
247
248 // Draw a gradient from P3 red to P3 green interpolating in unpremul sRGB, checking the corners.
249 {
250
251 SkPoint points[] = {{10.5,10.5}, {69.5,69.5}};
252 SkColor4f colors[] = {p3_to_srgb({1,0,0,1}), p3_to_srgb({0,1,0,1})};
253
254 SkPaint paint;
255 paint.setShader(SkGradientShader::MakeLinear(points, colors, srgb,
256 nullptr, SK_ARRAY_COUNT(colors),
257 SkShader::kClamp_TileMode));
258 canvas->drawRect({10,10,70,70}, paint);
259 canvas->save();
260 compare_pixel("UPM sRGB gradient, P3 red",
261 canvas, 10,10,
262 {1,0,0,1}, p3.get());
263
264 canvas->translate(180, 0);
265
266 compare_pixel("UPM sRGB gradient, P3 green",
267 canvas, 69,69,
268 {0,1,0,1}, p3.get());
269 canvas->restore();
270 }
271
272 canvas->translate(0,80);
273
274 // Draw a gradient from P3 red to P3 green interpolating in premul sRGB, checking the corners.
275 {
276
277 SkPoint points[] = {{10.5,10.5}, {69.5,69.5}};
278 SkColor4f colors[] = {p3_to_srgb({1,0,0,1}), p3_to_srgb({0,1,0,1})};
279
280 SkPaint paint;
281 paint.setShader(
282 SkGradientShader::MakeLinear(points, colors, srgb,
283 nullptr, SK_ARRAY_COUNT(colors),
284 SkShader::kClamp_TileMode,
285 SkGradientShader::kInterpolateColorsInPremul_Flag,
286 nullptr/*local matrix*/));
287 canvas->drawRect({10,10,70,70}, paint);
288 canvas->save();
289 compare_pixel("PM P3 gradient, P3 red",
290 canvas, 10,10,
291 {1,0,0,1}, p3.get());
292
293 canvas->translate(180, 0);
294
295 compare_pixel("PM P3 gradient, P3 green",
296 canvas, 69,69,
297 {0,1,0,1}, p3.get());
298 canvas->restore();
299 }
300
301 canvas->translate(0,80);
302
303 // Leon's blue -> green -> red gradient, interpolating in premul.
304 {
305 SkPoint points[] = {{10.5,10.5}, {10.5,69.5}};
306 SkColor4f colors[] = { {0,0,1,1}, {0,1,0,1}, {1,0,0,1} };
307
308 SkPaint paint;
309 paint.setShader(
310 SkGradientShader::MakeLinear(points, colors, p3,
311 nullptr, SK_ARRAY_COUNT(colors),
312 SkShader::kClamp_TileMode,
313 SkGradientShader::kInterpolateColorsInPremul_Flag,
314 nullptr/*local matrix*/));
315 canvas->drawRect({10,10,70,70}, paint);
316 canvas->save();
317 compare_pixel("Leon's gradient, P3 blue",
318 canvas, 10,10,
319 {0,0,1,1}, p3.get());
320
321 canvas->translate(180, 0);
322
323 compare_pixel("Leon's gradient, P3 red",
324 canvas, 10,69,
325 {1,0,0,1}, p3.get());
326 canvas->restore();
327 }
328
329 canvas->translate(0,80);
330
331 // Draw an A8 image with a P3 red, scaled and not, as a shader or bitmap.
332 {
333 uint8_t mask[256];
334 for (int i = 0; i < 256; i++) {
335 mask[i] = 255-i;
336 }
337 SkBitmap bm;
338 bm.installPixels(SkImageInfo::MakeA8(16,16), mask, 16);
339
340 SkPaint as_bitmap;
341 as_bitmap.setColor4f({1,0,0,1}, p3.get());
342 as_bitmap.setFilterQuality(kLow_SkFilterQuality);
343
344 SkPaint as_shader;
345 as_shader.setColor4f({1,0,0,1}, p3.get());
346 as_shader.setFilterQuality(kLow_SkFilterQuality);
347 as_shader.setShader(SkShader::MakeBitmapShader(bm, SkShader::kClamp_TileMode
348 , SkShader::kClamp_TileMode));
349
350 canvas->drawBitmap(bm, 10,10, &as_bitmap);
351 compare_pixel("A8 sprite bitmap P3 red",
352 canvas, 10,10,
353 {1,0,0,1}, p3.get());
354
355 canvas->translate(0, 80);
356
357 canvas->save();
358 canvas->translate(10,10);
359 canvas->drawRect({0,0,16,16}, as_shader);
360 canvas->restore();
361 compare_pixel("A8 sprite shader P3 red",
362 canvas, 10,10,
363 {1,0,0,1}, p3.get());
364
365 canvas->translate(0,80);
366
367 canvas->drawBitmapRect(bm, {10,10,70,70}, &as_bitmap);
368 compare_pixel("A8 scaled bitmap P3 red",
369 canvas, 10,10,
370 {1,0,0,1}, p3.get());
371
372 canvas->translate(0,80);
373
374 canvas->save();
375 canvas->translate(10,10);
376 canvas->scale(3.75,3.75);
377 canvas->drawRect({0,0,16,16}, as_shader);
378 canvas->restore();
379 compare_pixel("A8 scaled shader P3 red",
380 canvas, 10,10,
381 {1,0,0,1}, p3.get());
382 }
383
384 // TODO: draw P3 colors more ways
385 }
386
387 DEF_SIMPLE_GM(p3_ovals, canvas, 450, 320) {
388 auto p3 = SkColorSpace::MakeRGB(SkNamedTransferFn::kSRGB, SkNamedGamut::kDCIP3);
389
390 // Test cases that exercise each Op in GrOvalOpFactory.cpp
391
392 // Draw a circle and check the center (CircleOp)
393 {
394 SkPaint paint;
395 paint.setAntiAlias(true);
396 paint.setColor4f({ 1,0,0,1 }, p3.get());
397
398 canvas->drawCircle(40, 40, 30, paint);
399 compare_pixel("drawCircle P3 red ",
400 canvas, 40, 40,
401 { 1,0,0,1 }, p3.get());
402 }
403
404 canvas->translate(0, 80);
405
406 // Draw an oval and check the center (EllipseOp)
407 {
408 SkPaint paint;
409 paint.setAntiAlias(true);
410 paint.setColor4f({ 1,0,0,1 }, p3.get());
411
412 canvas->drawOval({ 20,10,60,70 }, paint);
413 compare_pixel("drawOval P3 red ",
414 canvas, 40, 40,
415 { 1,0,0,1 }, p3.get());
416 }
417
418 canvas->translate(0, 80);
419
420 // Draw a butt-capped dashed circle and check the top of the stroke (ButtCappedDashedCircleOp)
421 {
422 SkPaint paint;
423 paint.setAntiAlias(true);
424 paint.setColor4f({ 1,0,0,1 }, p3.get());
425 paint.setStyle(SkPaint::kStroke_Style);
426 float intervals[] = { 70, 10 };
427 paint.setPathEffect(SkDashPathEffect::Make(intervals, 2, 0));
428 paint.setStrokeWidth(10);
429
430 canvas->drawCircle(40, 40, 30, paint);
431 compare_pixel("drawDashedCircle P3 red ",
432 canvas, 40, 10,
433 { 1,0,0,1 }, p3.get());
434 }
435
436 canvas->translate(0, 80);
437
438 // Draw an oval with rotation and check the center (DIEllipseOp)
439 {
440 SkPaint paint;
441 paint.setAntiAlias(true);
442 paint.setColor4f({ 1,0,0,1 }, p3.get());
443
444 canvas->save();
445 canvas->translate(40, 40);
446 canvas->rotate(45);
447 canvas->drawOval({ -20,-30,20,30 }, paint);
448 canvas->restore();
449 compare_pixel("drawRotatedOval P3 red ",
450 canvas, 40, 40,
451 { 1,0,0,1 }, p3.get());
452 }
453
454 canvas->translate(0, 80);
455 }
456