Piece of the larger effort to merge readbuffer and validatingreadbuffer
Bug: skia:
Change-Id: I79305e27c4712c3b91d213d09d6c2ef24b86e671
Reviewed-on: https://skia-review.googlesource.com/81120
Commit-Queue: Mike Reed <reed@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
Change-Id: Ie3bada767f0ba945cb17f174f179510768eb178d
Reviewed-on: https://skia-review.googlesource.com/77583
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
It's causing a lot of sleep for being too hot. ThermalManager assumes
the trip points are static, when in fact, they are dynamic.
Bug: skia:7378
NOTRY=true
Change-Id: I907a42986831b7072a03a0423afd5a36bb2dfa74
Reviewed-on: https://skia-review.googlesource.com/80981
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
f5be5bafa6..12a18ad357
$ git log f5be5bafa..12a18ad35 --date=short --no-merges --format='%ad %ae %s'
2017-12-01 oetuaho Simplify interface block instance recording
2017-12-01 cwallez Add PackedEnumBitSet, use it for buffer binding validation
2017-12-05 geofflang Include the D3D11 headers on Windows when OpenGL is enabled.
2017-11-14 jgilbert Support RGB gl-tex-external stream consumers for StreamProducerNV12.
2017-11-22 kainino Replace TCache with static TType instances
2017-11-28 geofflang GL backend: Only synchronize transform feedback state when it changes.
2017-11-29 bryan.bernhart WebGLCompat: Fix depthstencil query results.
2017-12-01 oetuaho Test multiview extension warning
2017-11-30 oetuaho Fix handling matrix qualifiers on block members
2017-12-01 geofflang Improve documentation about selecting intial CL reviewers.
Created with:
roll-dep skia/third_party/externals/angle2
The AutoRoll server is located here: https://angle-skia-roll.skia.org
Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md
If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.
CQ_INCLUDE_TRYBOTS=skia.primary:Perf-Win10-Clang-AlphaR2-GPU-RadeonR9M470X-x86_64-Debug-All-ANGLE,Perf-Win10-Clang-NUC5i7RYH-GPU-IntelIris6100-x86_64-Debug-All-ANGLE,Perf-Win10-Clang-NUC6i5SYK-GPU-IntelIris540-x86_64-Debug-All-ANGLE,Perf-Win10-Clang-NUCD34010WYKH-GPU-IntelHD4400-x86_64-Debug-All-ANGLE,Perf-Win10-Clang-ShuttleC-GPU-GTX960-x86_64-Debug-All-ANGLE,Test-Win10-Clang-AlphaR2-GPU-RadeonR9M470X-x86_64-Debug-All-ANGLE,Test-Win10-Clang-NUC6i5SYK-GPU-IntelIris540-x86_64-Debug-All-ANGLE,Test-Win10-Clang-NUCD34010WYKH-GPU-IntelHD4400-x86_64-Debug-All-ANGLE,Test-Win10-Clang-ShuttleC-GPU-GTX960-x86_64-Debug-All-ANGLE,Build-Debian9-Clang-x86_64-Release-ANGLE
TBR=rmistry@google.com
Change-Id: I0844821233291b0f1031a6090d4f4251f7f30ce0
Reviewed-on: https://skia-review.googlesource.com/80844
Commit-Queue: angle-deps-roller . <angle-deps-roller@chromium.org>
Reviewed-by: angle-deps-roller . <angle-deps-roller@chromium.org>
Points cost 8 bytes and indices cost 4. If a point is accessed twice,
it's a wash whether we duplicate it or index. This change eliminates
texel buffers by duplicating points across instance arrays. This
reduces our dependence on extensions as well as getting rid of our
indirect memory access pattern in vertex shaders.
As a result of this change, memory usage by GPU buffers will only be a
fraction larger at worst, and slightly better at best.
Bug: skia:
Cq-Include-Trybots: skia.primary:Test-Debian9-Clang-GCE-CPU-AVX2-x86_64-Release-All-SKNX_NO_SIMD
Change-Id: I3c7f03772edd4f850d5fdd7b55552647335c1b52
Reviewed-on: https://skia-review.googlesource.com/79185
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
This partially reverts commit
1793e7bb46.
Hide SkEncodedInfo
Bug: skia:7353
Bug: skia:6839
This contains information that is not necessary for clients to know. The
Color enum tells the number of components in the input, but this is only
interesting internally (to the SkSwizzler).
Similarly, the Alpha enum differs from SkAlphaType in that it has
kBinary instead of kPremul. This is useful information only internally
for determining whether the SkColorSpaceXform needs to premultiply.
The bitsPerComponent is potentially useful for a client; Android (in
SkAndroidCodec) uses it to determine the SkColorType. Rather than
exposing bitsPerComponent, make SkAndroidCodec a friend so it can
access the SkEncodedInfo. A future change will change SkCodec to
recommend F16 for bitsPerComponent > 8, but that will be more involved;
it was the reason for the revert of this CL.
Switch conversionSupported to use an SkColorType, which is enough info.
Replace the SkEncodedInfo::Alpha field on SkCodec::FrameInfo with an
SkAlphaType.
SkCodec still needs an SkEncodedInfo, so move its header (which is
already not SK_API) to include/private.
TBR=mtklein@chromium.org,reed@google.com
Change-Id: I928b1f55317602cb37d29da63b53026c8d139cee
Reviewed-on: https://skia-review.googlesource.com/80860
Reviewed-by: Leon Scroggins <scroggo@google.com>
Commit-Queue: Leon Scroggins <scroggo@google.com>
Switch all ANGLE bots to build with Clang, sort, and dedup.
And remove -x86- ANGLE builders... there's no good reason to have
builders for this config unless we're going to Test/Perf it.
Bug: skia:7377
Change-Id: I1daf8ffa98e098274a4de0ff2c40a4a7e958b211
Reviewed-on: https://skia-review.googlesource.com/80740
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
Also limit small radius bail in GrCircleEffect to clip out cases.
Change-Id: I14ce736969b05203219d68f30283c36c84f78f3a
Reviewed-on: https://skia-review.googlesource.com/80621
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
Animated slides (like addarc) would appear to pause while dragging the
mouse around. This was because the message queue was never empty - we
would just alternate handling WM_MOUSEMOVE and WM_PAINT messages. Forcing
an onIdle before each onPaint appears to fix the problem.
Bug: skia:
Change-Id: I1d19f83c2cf480f327420a2682a074213847d062
Reviewed-on: https://skia-review.googlesource.com/80620
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
This reverts commit c6f7a4ffa9.
Reason for revert: Causing differences in Gold, stemming from the fact that this changes the recommended SkImageInfo for 16 bits-per-component PNG from N32 to F16.
- an F16 bitmap already png-encodes to a 16 bits-per-component PNG, but it does not encode a linear colorspace (possibly a bug?). when we decode this PNG using getInfo(), it fails because it has an F16 color type and non-linear colorspace. (In the encode-srgb-png gm, this results in blank results for F16.) We could correct this on the encoder side, but it seems possible that a 16 bits-per-component PNG could be encoded with a different color space. In that case, we'd want SkCodec to recommend F16/SRGBLinear, but I think we'd want the SkCodec to store the encoded SkColorSpace so that we can Xform between the two. Currently SkCodec only stores one color space, so that will require a refactor.
- When decoding 16-bits-per-component PNGs, we are now decoding them to F16. This shows differences in Gold. The srgb/gpu results now look more like F16. I think this is fine.
Original change's description:
> Hide SkEncodedInfo
>
> Bug: skia:7353
> Bug: skia:6839
>
> This contains information that is not necessary for clients to know. The
> Color enum tells the number of components in the input, but this is only
> interesting internally (to the SkSwizzler).
>
> Similarly, the Alpha enum differs from SkAlphaType in that it has
> kBinary instead of kPremul. This is useful information only internally
> for determining whether the SkColorSpaceXform needs to premultiply.
>
> The bitsPerComponent is potentially useful for a client; Android (in
> SkAndroidCodec) uses it to determine the SkColorType. Rather than
> exposing bitsPerComponent, use it to make the same decision that Android
> would have made - 16 bits per component means to set the info to F16. Add
> a test that computeOutputColorType behaves as expected.
>
> Switch conversionSupported to use an SkColorType, which is enough info.
>
> Replace the SkEncodedInfo::Alpha field on SkCodec::FrameInfo with an
> SkAlphaType.
>
> SkCodec still needs an SkEncodedInfo, so move its header (which is
> already not SK_API) to include/private.
>
> Change-Id: Ie2cf11339bf999ebfd4390c0f448f7edd6feabda
> Reviewed-on: https://skia-review.googlesource.com/79260
> Reviewed-by: Mike Reed <reed@google.com>
> Reviewed-by: Mike Klein <mtklein@chromium.org>
> Commit-Queue: Leon Scroggins <scroggo@google.com>
TBR=mtklein@chromium.org,scroggo@google.com,reed@google.com
Change-Id: I0c5dd1461e1b70d1e55349a8e7ee6b029c3f556e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:7353, skia:6839
Reviewed-on: https://skia-review.googlesource.com/80660
Reviewed-by: Leon Scroggins <scroggo@google.com>
Commit-Queue: Leon Scroggins <scroggo@google.com>
Bug: skia:
Change-Id: I0fc4f15abc44ff0a1b6b92e238e7abda35e7bacb
Reviewed-on: https://skia-review.googlesource.com/79904
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Bug: skia:7353
Bug: skia:6839
This contains information that is not necessary for clients to know. The
Color enum tells the number of components in the input, but this is only
interesting internally (to the SkSwizzler).
Similarly, the Alpha enum differs from SkAlphaType in that it has
kBinary instead of kPremul. This is useful information only internally
for determining whether the SkColorSpaceXform needs to premultiply.
The bitsPerComponent is potentially useful for a client; Android (in
SkAndroidCodec) uses it to determine the SkColorType. Rather than
exposing bitsPerComponent, use it to make the same decision that Android
would have made - 16 bits per component means to set the info to F16. Add
a test that computeOutputColorType behaves as expected.
Switch conversionSupported to use an SkColorType, which is enough info.
Replace the SkEncodedInfo::Alpha field on SkCodec::FrameInfo with an
SkAlphaType.
SkCodec still needs an SkEncodedInfo, so move its header (which is
already not SK_API) to include/private.
Change-Id: Ie2cf11339bf999ebfd4390c0f448f7edd6feabda
Reviewed-on: https://skia-review.googlesource.com/79260
Reviewed-by: Mike Reed <reed@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Leon Scroggins <scroggo@google.com>
This should prevent version skew and allow us to include this in
Gold results/bugs.
Bug: skia:
NOTRY=true
Change-Id: I9edacbb478e310eca39d2b56ac2059f26b0cb127
Reviewed-on: https://skia-review.googlesource.com/79940
Reviewed-by: Ben Wagner <benjaminwagner@google.com>
Reviewed-by: Stephan Altmueller <stephana@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Add newline-eof to the list of ignroed warnings.
Fix shadowed fields.
Bug: skia:
Change-Id: I4985ce2495194a7f805af98c4f42c44691086e36
Reviewed-on: https://skia-review.googlesource.com/79681
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
d5f44c9860..f5be5bafa6
$ git log d5f44c986..f5be5bafa --date=short --no-merges --format='%ad %ae %s'
2017-11-29 geofflang StateManagerGL: Use dirty bits for program binding.
Created with:
roll-dep skia/third_party/externals/angle2
The AutoRoll server is located here: https://angle-skia-roll.skia.org
Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md
If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.
CQ_INCLUDE_TRYBOTS=skia.primary:Perf-Win10-Clang-AlphaR2-GPU-RadeonR9M470X-x86_64-Debug-All-ANGLE,Perf-Win10-MSVC-Golo-GPU-QuadroP400-x86_64-Debug-All-ANGLE,Perf-Win10-Clang-NUC5i7RYH-GPU-IntelIris6100-x86_64-Debug-All-ANGLE,Perf-Win10-Clang-NUC6i5SYK-GPU-IntelIris540-x86_64-Debug-All-ANGLE,Perf-Win10-Clang-NUCD34010WYKH-GPU-IntelHD4400-x86_64-Debug-All-ANGLE,Perf-Win10-Clang-ShuttleC-GPU-GTX960-x86_64-Debug-All-ANGLE,Test-Win10-Clang-AlphaR2-GPU-RadeonR9M470X-x86_64-Debug-All-ANGLE,Test-Win10-MSVC-Golo-GPU-QuadroP400-x86_64-Debug-All-ANGLE,Test-Win10-Clang-NUC5i7RYH-GPU-IntelIris6100-x86_64-Debug-All-ANGLE,Test-Win10-Clang-NUC6i5SYK-GPU-IntelIris540-x86_64-Debug-All-ANGLE,Test-Win10-Clang-NUCD34010WYKH-GPU-IntelHD4400-x86_64-Debug-All-ANGLE,Test-Win10-Clang-ShuttleC-GPU-GTX960-x86_64-Debug-All-ANGLE,Build-Debian9-GCC-x86_64-Release-ANGLE
TBR=rmistry@google.com
Change-Id: Ib0095167e0db50164b727c72985ed2caac0ff4f1
Reviewed-on: https://skia-review.googlesource.com/79880
Reviewed-by: angle-deps-roller . <angle-deps-roller@chromium.org>
Commit-Queue: angle-deps-roller . <angle-deps-roller@chromium.org>
Bug: skia:
Change-Id: I53f3d426e97f446b17dc965fa8dd6d6aae441ac9
Reviewed-on: https://skia-review.googlesource.com/79901
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Reed <reed@google.com>
Plus some small rearrangements of the various warning lists.
Change-Id: Ied58f940341d69ddab971a529fd01b1e96b65641
Reviewed-on: https://skia-review.googlesource.com/67720
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
If we're already in sRGB gamut, we will not write to the 3x4 matrix,
but we still analyze it to see if we need clamping. So we might
(harmlessly) re-clamp some already clamped colors unnecessarily.
Found by this Chromium MSAN bot.
Bug: chromium:789767
Change-Id: I5d76e59b541a03ee8efbd4352262b4f650e1ec01
Reviewed-on: https://skia-review.googlesource.com/79762
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
The new check was a different config while we fixed the errors. Most
errors are now fixed, and merging these will help with running both on
the CQ.
No-Try: true
Change-Id: I5804ecea84a8dbbaacf6a4ea96e2af9505641d49
Reviewed-on: https://skia-review.googlesource.com/79323
Commit-Queue: Ben Wagner <benjaminwagner@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
This gives clients the ability to wrap GL textures with just the GL Format.
This enables us to distinquish between wrapping in Alpha8 texture that is
implented with Alpha or Red format
Bug: skia:
Change-Id: Iacbea60a149c436c270b7ff9ce5d019947678793
Reviewed-on: https://skia-review.googlesource.com/72600
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Also fix typo in CQ jobs
Bug: skia:
NOTRY=true
Change-Id: I74d6a382b4e93fdaceabd2adf9b060a6b88caae6
Reviewed-on: https://skia-review.googlesource.com/79761
Reviewed-by: Eric Boren <borenet@google.com>
Reviewed-by: Ravi Mistry <rmistry@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
See also: https://chrome-internal-review.googlesource.com/c/infradata/config/+/520679
This should help prevent many many Valgrind bots from
taking all the resources from the rest of the P400 bots
(including the CQ). This is a temporary measure, hopefully
TaskScheduler will be able to do this by itself in the future.
Bug: skia:
NOTRY=true
Change-Id: Ia618f9bd90364c6658e6b08b19c8bf214e5c33d9
Reviewed-on: https://skia-review.googlesource.com/79760
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Eric Boren <borenet@google.com>
Pushes and pops nested jmp_bufs in a stack for proper handling of
nested setjmp calls. Ensures longjmp is never called to a stack frame
that has exited.
Bug: skia:
Change-Id: I18d62504f6e5e3eb53026c3b48617b92ea74b905
Reviewed-on: https://skia-review.googlesource.com/79241
Reviewed-by: Leon Scroggins <scroggo@google.com>
Commit-Queue: Leon Scroggins <scroggo@google.com>
Bug: skia:7278
Change-Id: Ie8fc414490ece7b458c86d9bf6a20cefc28e34ba
Reviewed-on: https://skia-review.googlesource.com/79520
Reviewed-by: Eric Boren <borenet@google.com>
Commit-Queue: Eric Boren <borenet@google.com>
SVGPong relies on onOnceBeforeDraw() to initialize, but when switching
slides via Viewer's UI, onAnimate() is fired before the first paint.
Change-Id: I7be133072ec635975f7463538cd42edb69696b3f
Reviewed-on: https://skia-review.googlesource.com/79424
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
76746f9bc2..d5f44c9860
$ git log 76746f9bc..d5f44c986 --date=short --no-merges --format='%ad %ae %s'
2017-11-29 oetuaho Simplify parsing struct field declarators
Created with:
roll-dep skia/third_party/externals/angle2
The AutoRoll server is located here: https://angle-skia-roll.skia.org
Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md
If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.
CQ_INCLUDE_TRYBOTS=skia.primary:Perf-Win10-Clang-AlphaR2-GPU-RadeonR9M470X-x86_64-Debug-All-ANGLE,Perf-Win10-MSVC-Golo-GPU-QuadroP400-x86_64-Debug-All-ANGLE,Perf-Win10-Clang-NUC5i7RYH-GPU-IntelIris6100-x86_64-Debug-All-ANGLE,Perf-Win10-Clang-NUC6i5SYK-GPU-IntelIris540-x86_64-Debug-All-ANGLE,Perf-Win10-Clang-NUCD34010WYKH-GPU-IntelHD4400-x86_64-Debug-All-ANGLE,Perf-Win10-Clang-ShuttleC-GPU-GTX960-x86_64-Debug-All-ANGLE,Test-Win10-Clang-AlphaR2-GPU-RadeonR9M470X-x86_64-Debug-All-ANGLE,Test-Win10-MSVC-Golo-GPU-QuadroP400-x86_64-Debug-All-ANGLE,Test-Win10-Clang-NUC5i7RYH-GPU-IntelIris6100-x86_64-Debug-All-ANGLE,Test-Win10-Clang-NUC6i5SYK-GPU-IntelIris540-x86_64-Debug-All-ANGLE,Test-Win10-Clang-NUCD34010WYKH-GPU-IntelHD4400-x86_64-Debug-All-ANGLE,Test-Win10-Clang-ShuttleC-GPU-GTX960-x86_64-Debug-All-ANGLE,Build-Debian9-GCC-x86_64-Release-ANGLE
TBR=allanmac@google.com
Change-Id: Iacc69da6abb256993833f00e1147702b9b2bd48e
Reviewed-on: https://skia-review.googlesource.com/79460
Reviewed-by: angle-deps-roller . <angle-deps-roller@chromium.org>
Commit-Queue: angle-deps-roller . <angle-deps-roller@chromium.org>
shader.
This fixes a bug on some intel devices where we are failing
in the ProcessorOptimizationTest.
I've tried other "no op" type things between the floor call and abs which
also fixed the issue, as well as adding explicit checks to see if we are
less than -1 or greater than 1 where the clamp is. Thus the clamp itself
should be a no op and shouldn't secretly be fixing the problem outside
of forcing the floor and abs lines to be separate.
Bug: skia:
Change-Id: I85bf82e0e02607b78470b7a5f8f918e9f53f0154
Reviewed-on: https://skia-review.googlesource.com/76820
Reviewed-by: Robert Phillips <robertphillips@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
361df07032..76746f9bc2
$ git log 361df0703..76746f9bc --date=short --no-merges --format='%ad %ae %s'
2017-11-22 brandon1.jones Optimize Fragment Shader Type Match Validation
Created with:
roll-dep skia/third_party/externals/angle2
The AutoRoll server is located here: https://angle-skia-roll.skia.org
Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md
If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.
CQ_INCLUDE_TRYBOTS=skia.primary:Perf-Win10-Clang-AlphaR2-GPU-RadeonR9M470X-x86_64-Debug-All-ANGLE,Perf-Win10-MSVC-Golo-GPU-QuadroP400-x86_64-Debug-All-ANGLE,Perf-Win10-Clang-NUC5i7RYH-GPU-IntelIris6100-x86_64-Debug-All-ANGLE,Perf-Win10-Clang-NUC6i5SYK-GPU-IntelIris540-x86_64-Debug-All-ANGLE,Perf-Win10-Clang-NUCD34010WYKH-GPU-IntelHD4400-x86_64-Debug-All-ANGLE,Perf-Win10-Clang-ShuttleC-GPU-GTX960-x86_64-Debug-All-ANGLE,Test-Win10-Clang-AlphaR2-GPU-RadeonR9M470X-x86_64-Debug-All-ANGLE,Test-Win10-MSVC-Golo-GPU-QuadroP400-x86_64-Debug-All-ANGLE,Test-Win10-Clang-NUC5i7RYH-GPU-IntelIris6100-x86_64-Debug-All-ANGLE,Test-Win10-Clang-NUC6i5SYK-GPU-IntelIris540-x86_64-Debug-All-ANGLE,Test-Win10-Clang-NUCD34010WYKH-GPU-IntelHD4400-x86_64-Debug-All-ANGLE,Test-Win10-Clang-ShuttleC-GPU-GTX960-x86_64-Debug-All-ANGLE,Build-Debian9-GCC-x86_64-Release-ANGLE
TBR=allanmac@google.com
Change-Id: I6f3069aee6e8f9ca6513302f033c271025f641f7
Reviewed-on: https://skia-review.googlesource.com/79194
Commit-Queue: angle-deps-roller . <angle-deps-roller@chromium.org>
Reviewed-by: angle-deps-roller . <angle-deps-roller@chromium.org>
The GPU and CPU share the same code for layout; the layout is too large for CPU. So,
the CPU code must clear some of the destination even if there would be no work to do.
Change-Id: I29a04217b620b033a01db53487dc64e377661436
BUG=chromium:789812
Reviewed-on: https://skia-review.googlesource.com/79401
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
