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Leon Scroggins 23cbb99c8e Fix blending bug in animated webp decodes 
Bug: webp:490

Depending on the encoded image, SkWebpCodec may need to blend the
the output from libwebp with the prior frame. It does so using the
method blend_line, which expects the libwebp output to be unpremul.

Prior to this commit, SkWebpCodec sometimes told libwebp to premultiply,
and then passed that premultiplied data to blend_line, which
premultiplied again.

Use webpInfo's alphaType to decide whether to premultiply. Consolidate
choosing its alphaType into one block. The functional difference is that
if (blendWithPrevFrame), we no longer premul if the dst is kPremul.

Move declaration of webDst to where it's used.

Add a test.

Change-Id: Ic0cfb4d918c2ab434c6787ed5a532c4d1e67fa17
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/342618
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Commit-Queue: Derek Sollenberger <djsollen@google.com>
Auto-Submit: Leon Scroggins <scroggo@google.com>
2020-12-10 16:24:08 +00:00
..
toolchain allow overriding {target,host}_link = ... in GN 2020-11-05 19:40:47 +00:00
__init__.py
bench.gni Add GrPathUtils::findCubicConvex180Chops 2020-11-02 20:33:54 +00:00
BUILD.gn Add ios_min_target. 2020-11-18 21:21:25 +00:00
BUILDCONFIG.gn Add ios_min_target. 2020-11-18 21:21:25 +00:00
call.py [minor] mark scripts as executable 2019-11-21 17:06:27 +00:00
checkdir.py fix print functions for python3 gn scripts 2020-03-06 17:42:39 +00:00
checkpath.py Python3 tweaks 2019-12-17 17:12:03 +00:00
codesign_ios.py Update code-signing script to have better error messages. 2020-11-09 18:41:36 +00:00
compile_ib_files.py Reland "Add launch screen to iOS apps" 2019-09-05 14:05:08 +00:00
compile_processors.py Fix worklist files with skslc. 2020-11-18 19:41:45 +00:00
compile_sksl_tests.py Fix SPIR-V golden output file extensions. 2020-11-23 21:15:13 +00:00
copy_git_directory.py GN tools: copy_git_directory.py better error message. 2019-11-19 17:04:18 +00:00
core.gni Rename SkBitmapController to SkMipmapAccessor 2020-12-08 15:08:52 +00:00
cp.py Work around python 2 shutil.copy2 date bug 2020-09-28 20:12:13 +00:00
create_sksl_fp.py SkSL include files are now stored in a binary format 2020-07-31 13:48:25 +00:00
dehydrate_sksl.py Reland "Untangle dependency cycle in sksl dehydration" 2020-08-10 15:47:43 +00:00
effects_imagefilters.gni Add new SkImageFilters factory API 2019-08-02 13:33:35 +00:00
effects.gni Convert GLHighContrastFilterEffect to an .fp file. 2020-07-10 20:54:33 +00:00
find_headers.py Python3 tweaks 2019-12-17 17:12:03 +00:00
find_msvc.py Add Preview to list of possible MSVC versions. 2020-04-30 19:54:33 +00:00
find_xcode_sysroot.py fix print functions for python3 gn scripts 2020-03-06 17:42:39 +00:00
flutter_defines.gni Add flag to hide non-sampling imageshader factories 2020-12-08 20:33:23 +00:00
fuchsia_defines.gni Enable new clip stack for Fuchsia 2020-10-12 20:41:03 +00:00
gen_plist_ios.py Add product bundle name to iOS Xcode projects 2020-11-16 16:00:56 +00:00
gm.gni GPU clear values: just 4 floats 2020-12-02 22:04:08 +00:00
gn_meta_sln.py fix print functions for python3 gn scripts 2020-03-06 17:42:39 +00:00
gn_to_bp_utils.py Cleanup gn_to_bp_utils 2020-10-16 16:01:32 +00:00
gn_to_bp.py Remove windows:enabled from skia_deps 2020-11-12 16:26:48 +00:00
gn_to_cmake.py Switch GN defs on Mac and iOS to use frameworks, take 3 2020-08-12 17:03:47 +00:00
gpu.gni Implement stroke tessellation with indirect draws 2020-12-10 00:25:17 +00:00
highest_version_dir.py fix print functions for python3 gn scripts 2020-03-06 17:42:39 +00:00
ios.gni Add ios_min_target. 2020-11-18 21:21:25 +00:00
is_clang.py Fix is_clang python3 encoding errors 2020-06-26 18:41:00 +00:00
make_gm_gni.py GMs: re-sort gni, script to regenerate gni, file name convention 2019-05-02 20:08:37 +00:00
opts.gni add structure for normal SKX opts 2020-06-05 13:48:39 +00:00
pdf.gni Make skia_use_xps option work on Windows 2020-03-24 17:09:33 +00:00
push_to_android.py
rm.py Delete .a file before writing static library. 2020-06-11 17:19:23 +00:00
run_sksllex.py Reland "Fetch clang-format automatically when compiling .fp files." 2020-06-12 13:21:41 +00:00
samples.gni Add toy variable-width stroker sample 2020-10-26 14:43:03 +00:00
shared_sources.gni add structure for normal SKX opts 2020-06-05 13:48:39 +00:00
skia.gni Reland "[svg] Relocate out of experimental" 2020-10-16 02:32:41 +00:00
sksl_tests.gni Fix floatBitsToInt family of intrinsics and add tests. 2020-12-10 15:33:48 +00:00
sksl.gni Reland "Revert "Initial land of SkSL DSL."" 2020-12-10 15:02:30 +00:00
tests.gni Fix blending bug in animated webp decodes 2020-12-10 16:24:08 +00:00
utils.gni Remove SkWhitelistTypefaces. 2020-06-30 14:54:53 +00:00
xps.gni harmonize rewrite-includes and gn-format checks 2020-04-03 17:00:54 +00:00