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61 lines
2.3 KiB
61 lines
2.3 KiB
/*
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* Copyright 2020 Google LLC
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "include/codec/SkCodec.h"
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#include "include/core/SkBitmap.h"
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#include "tests/Test.h"
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#include "tools/Resources.h"
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#include "tools/ToolUtils.h"
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DEF_TEST(WebpCodecBlend, r) {
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const char* path = "images/blendBG.webp";
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auto codec = SkCodec::MakeFromData(GetResourceAsData(path));
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if (!codec) {
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ERRORF(r, "Failed to open/decode %s", path);
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return;
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}
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// Previously, a bug in SkWebpCodec resulted in different output depending
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// on whether kPremul or kOpaque SkAlphaType was passed to getPixels().
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// Decode each frame twice, once with kPremul and once with kOpaque if the
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// frame is opaque, and verify they look the same.
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auto premulInfo = codec->getInfo().makeAlphaType(kPremul_SkAlphaType);
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SkBitmap premulBm, changeBm;
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premulBm.allocPixels(premulInfo);
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changeBm.allocPixels(premulInfo); // The SkBitmap's SkAlphaType is unrelated to the bug.
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for (int i = 0; i < codec->getFrameCount(); i++) {
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SkCodec::Options options;
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options.fFrameIndex = i;
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auto result = codec->getPixels(premulBm.pixmap(), &options);
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if (result != SkCodec::kSuccess) {
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ERRORF(r, "Failed to decode %s frame %i (premul) - error %s", path, i,
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SkCodec::ResultToString(result));
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return;
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}
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SkCodec::FrameInfo frameInfo;
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if (!codec->getFrameInfo(i, &frameInfo)) {
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ERRORF(r, "Failed to getFrameInfo for %s frame %i", path, i);
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return;
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}
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auto alphaType = frameInfo.fAlphaType == kOpaque_SkAlphaType ? kOpaque_SkAlphaType
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: kPremul_SkAlphaType;
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result = codec->getPixels(premulInfo.makeAlphaType(alphaType), changeBm.getPixels(),
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changeBm.rowBytes(), &options);
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if (result != SkCodec::kSuccess) {
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ERRORF(r, "Failed to decode %s frame %i (change) - error %s", path, i,
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SkCodec::ResultToString(result));
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return;
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}
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REPORTER_ASSERT(r, ToolUtils::equal_pixels(premulBm, changeBm), "%s frame %i does not match"
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" with mismatched SkAlphaType", path, i);
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}
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}
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