libjpeg-turbo turns on dithering by default. When we
decode to RGBA, it uses Floyd-Steinberg dithering -
consistent with the libjpeg6b gold standard,
When we decode to 565, it uses ordered dithering. Ordered
dithering for 565 is not part of the 6b standard (libjpeg6b
doesn't even support 565) and is causing us a number of
issues:
(1) Ordered dithering + nearest neighbor sampling is
causing checkerboard visual artifacts in some outputs.
(2) The ordered dither function in libjpeg-turbo actually
behaves differently depending on the alignment of the
memory that it decodes into. This means that two image
decodes that should be identical may look different just
because they decode into different memory blocks. This
was causing some diffs on Gold with the scanline_subset
test that were causing me some confusion.
(3) Maybe not the best evidence, but visually I can't tell
a difference with and without dithering (except when
nearest neighbor scaling causes the checkerboard artifact).
(4) Turning off dithering should be a more significant
performance improvement than you might expect.
libjpeg-turbo has SIMD color conversions to 565, but when
dithering is on, it defaults to scalar code.
This CL should make every jpeg decode to 565 on Gold look
slightly different. Yay!
BUG=skia:
Review URL: https://codereview.chromium.org/1349563007
Right now we have a bug in Gold where some images are labeled
_0.167 and others are labeled _0.166. They are all 1/6
scales and should be labeled the same way and compared.
The fix involves changing 0.166 to 0.167 in the list of
scales that we test on, but SkScaledCodec does not scale
to 0.167 as I expected.
SkScaledCodec converts 0.167 to sampleSize = 5.999 and then
casts to sampleSize = 5. I would argue that we should do
a true round, so 0.167 represents a sampleSize of 6.
In general, this CL change onGetScaledDimensions so that
we now round desiredScale to the nearest sampleSize.
BUG=skia:
Review URL: https://codereview.chromium.org/1356923002
Reason for revert:
Failing ImageNewShaderTest on both Android (Tegra3 GPU) and iOS bots.
e.g.
/Users/chrome-bot/buildbot/skiabot-ipad4-000/build/slave/workdir/build/skia/tests/
ImageNewShaderTest.cpp:24 0 == memcmp(bm1.getPixels(), bm2.getPixels(), bm1.getSize())
ImageNewShaderTest.cpp:95 0xFFFF0000 == bmt.getColor(0, y)
ImageNewShaderTest.cpp:98 0xFFDEDEDE == bmt.getColor(x, y)
ImageNewShaderTest.cpp:98 0xFFDEDEDE == bmt.getColor(x, y)
ImageNewShaderTest.cpp:98 0xFFDEDEDE == bmt.getColor(x, y)
ImageNewShaderTest.cpp:98 0xFFDEDEDE == bmt.getColor(x, y)
ImageNewShaderTest.cpp:95 0xFFFF0000 == bmt.getColor(0, y)
...
Original issue's description:
> add ImageShader, sharing code with its Bitmap cousin
>
> This is done by having abstracted the BitmapShaderContext to take a BitmapProvider, instead of just a bitmap. This allows us to share all of that code between SkBitmap and SkImage, since both are valid providers.
>
> It also means that we can simplify SkImage_Base to not need a virtual for onNewShader, since ALL images can uniformly be turned into a shader now.
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/0b93e3149d2cb30860c51f9f3204ae811d9a97caTBR=fmalita@chromium.org,bsalomon@google.com,robertphillips@google.com,reed@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:
Review URL: https://codereview.chromium.org/1355863002
This is done by having abstracted the BitmapShaderContext to take a BitmapProvider, instead of just a bitmap. This allows us to share all of that code between SkBitmap and SkImage, since both are valid providers.
It also means that we can simplify SkImage_Base to not need a virtual for onNewShader, since ALL images can uniformly be turned into a shader now.
BUG=skia:
Review URL: https://codereview.chromium.org/1342113002
When a bot ends with extra_config SK_LIKE_THIS,
we'll define SK_LIKE_THIS when compiling.
CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SK_USE_DISCARDABLE_SCALEDIMAGECACHE-Trybot,Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot
BUG=skia:4354
Review URL: https://codereview.chromium.org/1346833004
Previously annotations added between saveLayer/restore were lost.
Merge annotations in SkPDFDevice::drawDevice(). Also modified code to
apply correct transformation and clipping on annotations added between
saveLayer/restore:
- Apply the initial transform only when adding the annotations into the
doc, otherwise we need to unapply sub-device's initial transform
before merging the annotations into parent-device.
- Apply only device-local clipping. fClipStack is in global coordinates,
which is not suitable to clip rects in sub-devices.
BUG=skia:4080
BUG=503515
Review URL: https://codereview.chromium.org/1257533004
Remove some bogus tests on the cache, as they are not thread-reliable. Running w/ discardable these are racy.
BUG=532981
Review URL: https://codereview.chromium.org/1351453004
The new FP is used to implement SkXM::Mode color filters and SkXM::Mode image filters. Also, these now support all advanced SkXM::Mode xfermodes.
Review URL: https://codereview.chromium.org/1334293003
Adds an entry point to GrContext to allow enumeration and tracing of GPU resources
via the newly added SkTraceMemoryDump.
Plan is for Chrome to call this on each of its GrContexts.
Dumps both the total size of GPU resources, as well as the total purgeable size.
BUG=526261
Review URL: https://codereview.chromium.org/1313743002
