1 /*
2 * Copyright 2020 Google LLC
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/codec/SkCodec.h"
9 #include "include/core/SkBitmap.h"
10 #include "tests/Test.h"
11 #include "tools/Resources.h"
12 #include "tools/ToolUtils.h"
13
DEF_TEST(WebpCodecBlend,r)14 DEF_TEST(WebpCodecBlend, r) {
15 const char* path = "images/blendBG.webp";
16 auto codec = SkCodec::MakeFromData(GetResourceAsData(path));
17 if (!codec) {
18 ERRORF(r, "Failed to open/decode %s", path);
19 return;
20 }
21
22 // Previously, a bug in SkWebpCodec resulted in different output depending
23 // on whether kPremul or kOpaque SkAlphaType was passed to getPixels().
24 // Decode each frame twice, once with kPremul and once with kOpaque if the
25 // frame is opaque, and verify they look the same.
26 auto premulInfo = codec->getInfo().makeAlphaType(kPremul_SkAlphaType);
27 SkBitmap premulBm, changeBm;
28 premulBm.allocPixels(premulInfo);
29 changeBm.allocPixels(premulInfo); // The SkBitmap's SkAlphaType is unrelated to the bug.
30
31 for (int i = 0; i < codec->getFrameCount(); i++) {
32 SkCodec::Options options;
33 options.fFrameIndex = i;
34 auto result = codec->getPixels(premulBm.pixmap(), &options);
35 if (result != SkCodec::kSuccess) {
36 ERRORF(r, "Failed to decode %s frame %i (premul) - error %s", path, i,
37 SkCodec::ResultToString(result));
38 return;
39 }
40
41 SkCodec::FrameInfo frameInfo;
42 if (!codec->getFrameInfo(i, &frameInfo)) {
43 ERRORF(r, "Failed to getFrameInfo for %s frame %i", path, i);
44 return;
45 }
46
47 auto alphaType = frameInfo.fAlphaType == kOpaque_SkAlphaType ? kOpaque_SkAlphaType
48 : kPremul_SkAlphaType;
49 result = codec->getPixels(premulInfo.makeAlphaType(alphaType), changeBm.getPixels(),
50 changeBm.rowBytes(), &options);
51 if (result != SkCodec::kSuccess) {
52 ERRORF(r, "Failed to decode %s frame %i (change) - error %s", path, i,
53 SkCodec::ResultToString(result));
54 return;
55 }
56
57 REPORTER_ASSERT(r, ToolUtils::equal_pixels(premulBm, changeBm), "%s frame %i does not match"
58 " with mismatched SkAlphaType", path, i);
59 }
60 }
61
