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Explicitly set alpha type of bitmaps with JPEG data to opaque

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Actually fixes #11245.
This commit is contained in:
Aleksei Kuzmin 2017-11-30 17:56:32 +01:00
parent c0c983d28d
commit b9ed7380aa
2 changed files with 15 additions and 2 deletions
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15
atom/common/api/atom_api_native_image.cc
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@ -17,6 +17,8 @@
#include "base/strings/string_util.h"
#include "native_mate/object_template_builder.h"
#include "net/base/data_url.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkImageInfo.h"
#include "third_party/skia/include/core/SkPixelRef.h"
#include "ui/base/layout.h"
#include "ui/base/webui/web_ui_util.h"
@ -93,9 +95,20 @@ bool AddImageSkiaRep(gfx::ImageSkia* image,
std::unique_ptr<SkBitmap> decoded(new SkBitmap());
// Try PNG first.
if (!gfx::PNGCodec::Decode(data, size, decoded.get()))
if (!gfx::PNGCodec::Decode(data, size, decoded.get())) {
// Try JPEG.
decoded = gfx::JPEGCodec::Decode(data, size);
if (decoded) {
// `JPEGCodec::Decode()` doesn't tell `SkBitmap` instance it creates
// that all of its pixels are opaque, that's why the bitmap gets
// an alpha type `kPremul_SkAlphaType` instead of `kOpaque_SkAlphaType`.
// Let's fix it here.
// TODO(alexeykuzmin): This workaround should be removed
// when the `JPEGCodec::Decode()` code is fixed.
// See https://github.com/electron/electron/issues/11294.
decoded->setAlphaType(SkAlphaType::kOpaque_SkAlphaType);
}
}
if (!decoded) {
// Try Bitmap

2
spec/api-native-image-spec.js
View file

@ -29,7 +29,7 @@ describe('nativeImage module', () => {
width: 1
},
{
dataUrl: 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAYAAABytg0kAAAAFUlEQVQYlWP8////fwYGBgYmBigAAD34BABBrq9BAAAAAElFTkSuQmCC',
dataUrl: 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAIAAAD91JpzAAAAFklEQVQYlWP8//8/AwMDEwMDAwMDAwAkBgMBBMzldwAAAABJRU5ErkJggg==',
filename: '2x2.jpg',
format: ImageFormat.JPEG,
hasAlphaChannel: false,