1 /*
2 * Copyright 2019 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 "include/core/SkCanvas.h"
9 #include "include/core/SkColorFilter.h"
10 #include "include/core/SkPaint.h"
11 #include "include/core/SkSurface.h"
12 #include "include/effects/SkColorMatrix.h"
13 #include "include/gpu/GrDirectContext.h"
14 #include "src/core/SkAutoPixmapStorage.h"
15 #include "tests/Test.h"
16 #include "tests/TestUtils.h"
17
DEF_GPUTEST_FOR_RENDERING_CONTEXTS(MatrixColorFilter_TransparentBlack,reporter,info)18 DEF_GPUTEST_FOR_RENDERING_CONTEXTS(MatrixColorFilter_TransparentBlack, reporter, info) {
19 auto context = info.directContext();
20 // Make a transparent black image rather than use a paint color to avoid an optimization that
21 // applies the color filter on the CPU to paint colors.
22 auto imgSurf = SkSurface::MakeRenderTarget(context, SkBudgeted::kYes,
23 SkImageInfo::MakeN32(5, 5, kPremul_SkAlphaType));
24 imgSurf->getCanvas()->drawColor(0x0000000);
25 auto shader = imgSurf->makeImageSnapshot()->makeShader(SkTileMode::kClamp, SkTileMode::kClamp);
26 SkColorMatrix m;
27 m.setScale(0, 0, 0, 127.f);
28 SkPaint p;
29 p.setColorFilter(SkColorFilters::Matrix(m));
30 p.setShader(shader);
31 p.setBlendMode(SkBlendMode::kSrc);
32 auto surf = SkSurface::MakeRenderTarget(context, SkBudgeted::kYes,
33 SkImageInfo::MakeN32(5, 5, kPremul_SkAlphaType));
34 // Seed the output surface with red so we would notice if we failed to draw at all.
35 surf->getCanvas()->clear(SK_ColorRED);
36 surf->getCanvas()->drawPaint(p);
37 SkAutoPixmapStorage pixels;
38 pixels.alloc(surf->imageInfo());
39 surf->readPixels(pixels, 0, 0);
40 auto error = std::function<ComparePixmapsErrorReporter>(
41 [reporter](int x, int y, const float diffs[4]) {
42 ERRORF(reporter, "Expected transparent black, instead got (%f, %f, %f, %f)",
43 diffs[0], diffs[1], diffs[2], diffs[3]);
44 });
45 static constexpr float kTol[] = {0, 0, 0, 0};
46 CheckSolidPixels({0, 0, 0, 0}, pixels, kTol, error);
47 }
48