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 14DEF_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
