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Author SHA1 Message Date
msarett
36931c2b47 Add test for platform encoders, turn off platform encoders by default 
Clients that like WIC and CG can still use them.  And we can be
confident about that, since we now test WIC and CG.

Let Skia always use our own encoders by default, so we can do cool,
custom things on all platforms.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2250683003

Review-Url: https://codereview.chromium.org/2250683003
 2016-08-16 15:11:24 -07:00
msarett
36c38cbb29 Fix WIC encoder to support kJPEG_Type 
(1) Add support for kJPEG to WIC
(2) Add encoding test.
(3) Turn on WIC jpeg encoder on Windows and CG jpeg
    encoder on Mac.

A follow-up may make Skia's encoders the default on all
platforms.  But, in order to do that, I think we need
to write better encoding unit tests for CG and WIC.

BUG=skia:3969
BUG=skia:5632
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2245453002

Committed: https://skia.googlesource.com/skia/+/b3a7ef1fc0adc24859d2498aee54d3ec2cbcac3a
Review-Url: https://codereview.chromium.org/2245453002
 2016-08-15 18:52:17 -07:00
msarett
93963ba84e Revert of Fix WIC encoder to support kJPEG_Type (patchset #3 id:140001 of https://codereview.chromium.org/2245453002/ ) 
Reason for revert:
Broken Windows bot.

Original issue's description:
> Fix WIC encoder to support kJPEG_Type
>
> (1) Add support for kJPEG to WIC
> (2) Add encoding test.
> (3) Turn on WIC jpeg encoder on Windows and CG jpeg
>     encoder on Mac.
>
> A follow-up may make Skia's encoders the default on all
> platforms.  But, in order to do that, I think we need
> to write better encoding unit tests for CG and WIC.
>
> BUG=skia:3969
> BUG=skia:5632
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2245453002
>
> Committed: https://skia.googlesource.com/skia/+/b3a7ef1fc0adc24859d2498aee54d3ec2cbcac3a

TBR=mtklein@google.com,mtklein@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:3969

Review-Url: https://codereview.chromium.org/2246203002
 2016-08-15 13:52:31 -07:00
msarett
b3a7ef1fc0 Fix WIC encoder to support kJPEG_Type 
(1) Add support for kJPEG to WIC
(2) Add encoding test.
(3) Turn on WIC jpeg encoder on Windows and CG jpeg
    encoder on Mac.

A follow-up may make Skia's encoders the default on all
platforms.  But, in order to do that, I think we need
to write better encoding unit tests for CG and WIC.

BUG=skia:3969
BUG=skia:5632
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2245453002

Review-Url: https://codereview.chromium.org/2245453002
 2016-08-15 13:19:20 -07:00
caryclark
c2ad65e94d add gm that exercises compose shader allocations 
This gm triggers the assert in SkSmallAllocator.h
commented out by this CL.

PDFium constructs shaders that resemble the GM.

R=reed@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2249703002

Review-Url: https://codereview.chromium.org/2249703002
 2016-08-15 12:03:33 -07:00
dvonbeck
6ad75d10eb LightingFP now supports multiple directional lights 
BUG=skia:5518
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2239933004

Review-Url: https://codereview.chromium.org/2239933004
 2016-08-15 11:35:55 -07:00
egdaniel
3602d4f16a Allow vulkan to upload data to testing textures with optimal layouts 
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2242553002

Review-Url: https://codereview.chromium.org/2242553002
 2016-08-12 11:58:53 -07:00
vjiaoblack
772b5ee446 Added PointLights to SkLights::Light 
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2237493002

Review-Url: https://codereview.chromium.org/2237493002
 2016-08-12 11:38:47 -07:00
robertphillips
27cdd94790 Implement GPU occluded blur mask filter 
Spawned off: https://codereview.chromium.org/2214163003/ (Minor clean up related to blur mask filters)

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2201133002

Review-Url: https://codereview.chromium.org/2201133002
 2016-08-10 16:25:25 -07:00
halcanary
e9d55c57a6 Revert of Store mipmap levels in deferred texture image (patchset #11 id:200001 of https://codereview.chromium.org/2115023002/ ) 
Reason for revert:
speculative revert: android dm crashes

Original issue's description:
> Store mipmap levels in deferred texture image
>
> This is a follow-up to https://codereview.chromium.org/2034933003/ which
> was reverted due to a memory leak.
>
> When creating the deferred texture image, detect if using medium / high
> quality. If so, generate and store mipmaps in the deferred texture
> image.
>
> When creating a texture from that be sure to read it back out.
>
> BUG=578304
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2115023002
>
> Committed: https://skia.googlesource.com/skia/+/d6113140f7ae8996f679ac6698a60fb8c1386da3

TBR=brianosman@google.com,bsalomon@google.com,ericrk@chromium.org,cblume@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=578304

Review-Url: https://codereview.chromium.org/2227323002
 2016-08-09 17:46:25 -07:00
cblume
d6113140f7 Store mipmap levels in deferred texture image 
This is a follow-up to https://codereview.chromium.org/2034933003/ which
was reverted due to a memory leak.

When creating the deferred texture image, detect if using medium / high
quality. If so, generate and store mipmaps in the deferred texture
image.

When creating a texture from that be sure to read it back out.

BUG=578304
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2115023002

Review-Url: https://codereview.chromium.org/2115023002
 2016-08-09 13:45:56 -07:00
vjiaoblack
904527d165 moved code into onDrawShadowedPic, only renders into shadow maps if needed 
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2220633002

Review-Url: https://codereview.chromium.org/2220633002
 2016-08-09 09:32:09 -07:00
hstern
bb9b2247a2 Rework Overstroke GM to show differences between expected and actual 
Draw the perpendiculars of the curve with the stroke width. See Cary's
SampleQuadStroker.cpp for what we are attempting to mimic.

BUG=589769,skia:5405,skia:5406
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2218773003

Review-Url: https://codereview.chromium.org/2218773003
 2016-08-09 08:53:30 -07:00
reed
1ec04d9553 rename FoceCopyMode to SkCopyPixelMode 
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2220603002

Review-Url: https://codereview.chromium.org/2220603002
 2016-08-05 12:07:41 -07:00
lsalzman
40254c2c2d SkBlendARGB32 and S32[A]_Blend_BlitRow32 are currently formulated as: SkAlphaMulQ(src, src_scale) + SkAlphaMulQ(dst, dst_scale), which boils down to ((src*src_scale)>>8) + ((dst*dst_scale)>>8). In particular, note that the intermediate precision is discarded before the two parts are added together, causing the final result to possibly inaccurate. 
In Firefox, we use SkCanvas::saveLayer in combination with a backdrop that initializes the layer to the background. When this is blended back onto background using transparency, where the source and destination pixel colors are the same, the resulting color after the blend is not preserved due to the lost precision mentioned above. In cases where this operation is repeatedly performed, this causes substantially noticeable differences in color as evidenced in this downstream Firefox bug report:  https://bugzilla.mozilla.org/show_bug.cgi?id=1200684

In the test-case in the downstream report, essentially it does blend(src=0xFF2E3338, dst=0xFF2E3338, scale=217), which gives the result 0xFF2E3237, while we would expect to get back 0xFF2E3338.

This problem goes away if the blend is instead reformulated to effectively do (src*src_scale + dst*dst_scale)>>8, which keeps the intermediate precision during the addition before shifting it off.

This modifies the blending operations thusly. The performance should remain mostly unchanged, or possibly improve slightly, so there should be no real downside to doing this, with the benefit of making the results more accurate. Without this, it is currently unsafe for Firefox to blend a layer back onto itself that was initialized with a copy of its background.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2097883002
CQ_INCLUDE_TRYBOTS=master.client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot

[mtklein adds...]
No public API changes.
TBR=reed@google.com

Review-Url: https://codereview.chromium.org/2097883002
 2016-08-05 11:48:45 -07:00
vjiaoblack
955e879c6d Making a sample for shadow maps for more intensive development 
Merge branch 'shadow-gm' into shadow-sample

Added variable size shadow maps. Also fixed some bugs

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2198933002

Review-Url: https://codereview.chromium.org/2198933002
 2016-08-05 07:55:01 -07:00
robertphillips
9aff85a545 Minor clean up related to blur mask filters 
This is the non-substantive portion of: https://codereview.chromium.org/2201133002/ (Implement GPU occluded blur mask filter)

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2214163003

Review-Url: https://codereview.chromium.org/2214163003
 2016-08-05 07:51:30 -07:00
robertphillips
401c1968a1 Add new GM for occluded blurmask filter draws 
This splits out just the GM portion of https://codereview.chromium.org/2201993003/ (Add GM to test out blurmaskfilter occluders) which included some API changes

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2214033002

Review-Url: https://codereview.chromium.org/2214033002
 2016-08-04 12:35:46 -07:00
mtklein
7a1f45f9e5 spin off easy stuff from Herb's windows GN CL 
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2209533004

No public API changes.
TBR=reed@google.com

Review-Url: https://codereview.chromium.org/2209533004
 2016-08-04 06:19:33 -07:00
bungeman
ffae30db4a Convert SkAutoTUnref<SkData> to sk_sp<SkData>. 
With the move from SkData::NewXXX to SkData::MakeXXX most
SkAutoTUnref<SkData> were changed to sk_sp<SkData>. However,
there are still a few SkAutoTUnref<SkData> around, so clean
them up.

Review-Url: https://codereview.chromium.org/2212493002
 2016-08-03 13:32:32 -07:00
fmenozzi
7a9f3766aa Update hardstop_gradients GM to include more special cases 
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2204873005

Review-Url: https://codereview.chromium.org/2204873005
 2016-08-03 07:58:06 -07:00
bungeman
38d909ec28 Move off SK_SUPPORT_LEGACY_DATA_FACTORIES. 
This moves Skia code off of SK_SUPPORT_LEGACY_DATA_FACTORIES.
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2206633004

Review-Url: https://codereview.chromium.org/2206633004
 2016-08-02 14:40:46 -07:00
hstern
02aea1c92c Add Overstroke gm 
Already exists as a sampleapp, but sampleapps don't get tested
automatically

BUG=skia:5405,5406,chrome:589769
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2161633002

Review-Url: https://codereview.chromium.org/2161633002
 2016-08-02 10:35:57 -07:00
msarett
c573a40ed5 Add drawImageLattice() and drawBitmapLattice() APIs 
The specified image/bitmap is divided into rects, which
can be draw stretched, shrunk, or at a fixed size.  Will be
used by Android to draw 9patch (which are acutally N-patch)
images.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1992283002

Review-Url: https://codereview.chromium.org/1992283002
 2016-08-02 08:05:56 -07:00
vjiaoblack
53da5ba619 adding new GM to demostrate new shadows 
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2118553002

Review-Url: https://codereview.chromium.org/2118553002
 2016-08-01 10:02:31 -07:00
fmalita
eae6a91277 SkPaint intercept API for SkTextBlob and horizontal text 
Add getPosTextHIntercepts(), getTextBlobIntercepts().

Consolidate the implementation in GetTextIntercepts<> template.

BUG=chormium:581456
R=caryclark@google.com,reed@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2186663004

Review-Url: https://codereview.chromium.org/2186663004
 2016-07-28 09:47:24 -07:00
robertphillips
a408c8fb6d Add SkGammaColorFilter 
WDYT about this as a means of replacing GrContext::applyGamma with a normal SkCanvas::drawImage?

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2190573002

Review-Url: https://codereview.chromium.org/2190573002
 2016-07-28 09:20:33 -07:00
dvonbeck
bba4cfebca Added API for Bevel NormalSource. 
This CL adds an API  for Bevel normal source and a dummy implementation that returns a normal (0, 0, 1) every time.

This CL's base is the CL for accepting nullptrs: https://codereview.chromium.org/2132113002

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2080993002

Review-Url: https://codereview.chromium.org/2080993002
 2016-07-28 08:58:19 -07:00
brianosman
3a0dbde1cf Remove SkSurfaceProps gamma-correctness flag entirely. 
This is no longer required - gamma-correctness is now just based on the
presence or absence of a color space.

Public API change is just removal of (unused) flag.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2188463002
TBR=bsalomon@google.com

Review-Url: https://codereview.chromium.org/2188463002
 2016-07-26 11:36:05 -07:00
egdaniel
26318c984f Update bleed-downscale GM to use power of 2 texture 
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2179303004

Review-Url: https://codereview.chromium.org/2179303004
 2016-07-26 08:26:46 -07:00
brianosman
8fe485b793 Just pass the draw context to paint conversion 
Concentrate on using draw context functionality to answer gamma and color
related queries in more places.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2182603003

Review-Url: https://codereview.chromium.org/2182603003
 2016-07-25 12:31:51 -07:00
reed
2adecda92b add gm to test bleed with downscale 
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2182503002

TBR=

Review-Url: https://codereview.chromium.org/2182503002
 2016-07-25 08:11:58 -07:00
brianosman
1638c0deea Add destination color space to AsFPArgs. Eliminates last XFORMTODO. 
This is going to be needed in many more places as I finish connecting the
dots. Even better - I'd like to switch to a world where SkColorSpace !=
nullptr is the only signal we use for gamma-correct rendering, so I can
eliminate SkSourceGammaTreatment and SkSurfaceProps::isGammaCorrect.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2180503002

Review-Url: https://codereview.chromium.org/2180503002
 2016-07-25 05:12:53 -07:00
brianosman
839345d634 Bundle SkShader::asFragmentProcessor arguments in a struct 
The signature of this thing keeps changing (and is about to change again).
This just makes maintenance much easier.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2175563003

Review-Url: https://codereview.chromium.org/2175563003
 2016-07-22 11:04:53 -07:00
bungeman
5379051ee7 Fix SkScalerContext_FreeType::generateFontMetrics. 
SkScalerContext::generateFontMetrics implementations should not attempt
to take into account skew. This implementation should correctly handle
bitmap fonts as well.

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2165323002

Review-Url: https://codereview.chromium.org/2165323002
 2016-07-21 13:32:09 -07:00
dvonbeck
680e2e9a9e Fixed GM:lightingshader2 size 
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2171853002

Review-Url: https://codereview.chromium.org/2171853002
 2016-07-21 12:19:54 -07:00
brianosman
dddbe380b0 Adding an SkColorSpace to SkImage_Gpu 
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2165703003

Review-Url: https://codereview.chromium.org/2165703003
 2016-07-20 13:55:39 -07:00
dvonbeck
c526da94e4 SkLS now accepting nullptr for diffuse shader and normal source, now accurately handling alpha 
This CL's base is the CL for taking in a diffuse shader into SkLS on the API side: https://codereview.chromium.org/2064153002

BUG=skia:5502,skia:5517
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2132113002

Review-Url: https://codereview.chromium.org/2132113002
 2016-07-20 11:20:30 -07:00
brianosman
54f30c13fc Introduce GrColorSpaceXform, for gamut conversion on textures 
GrTextureAccess optionally includes an instance, computed from the src
and dst color spaces. In all common cases (no color space for either src
or dst, or same color space for both), no object is allocated.

This change is orthogonal to my attempts to get color space attached to
render targets - regardless of how we choose to do that, this will give
us the source color space at all points where we are connecting src to
dst.

There are many dangling injection points where I've been inserting
nullptr, but I have a record of all of them. Additionally, there are now
three places (the most common simple paths for bitmap/image rendering)
where things are plumbed enough that I expect to have access to the dst
color space (all marked with XFORMTODO).

In addition to getting the dst color space, I need to inject shader code
and uniform uploading for appendTextureLookup and friends.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2154753003

Review-Url: https://codereview.chromium.org/2154753003
 2016-07-18 10:53:52 -07:00
halcanary
39f988eb41 SkPDF: Always give a default advance for glyphs. 
Prior to this we assumed the default default was 0.  It is
actually 1000, according to the spec.

fixes BUG=skia:5321
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2146403005

Review-Url: https://codereview.chromium.org/2146403005
 2016-07-15 12:54:30 -07:00
mtklein
6e21efd842 Probably no need for GM self-tests now that GM doesn't exist. 
This is... belated.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2154603002

Review-Url: https://codereview.chromium.org/2154603002
 2016-07-14 19:39:38 -07:00
bsalomon
7cf36ccb44 Stop testing texture-backed bitmaps in drawbitmaprect GM 
BUG=skia:5531
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2148793003

Review-Url: https://codereview.chromium.org/2148793003
 2016-07-14 09:33:42 -07:00
bsalomon
614d8f9a3c Remove GrWrapTextureInBitmap from public API 
BUG=skia:5531
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2147053002

Review-Url: https://codereview.chromium.org/2147053002
 2016-07-13 15:42:40 -07:00
bsalomon
a2e0837c33 Stop testing texture-backed bitmaps in bleed GMs 
BUG=skia:5531

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2141973004

Review-Url: https://codereview.chromium.org/2141973004
 2016-07-13 14:50:17 -07:00
bungeman
f382b48687 Disable aliased font test on iOS. 
See if not requesting aliased text fixes iOS.

BUG=skia:5530

TBR=mtklein

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2150483003

Review-Url: https://codereview.chromium.org/2150483003
 2016-07-13 14:00:39 -07:00
csmartdalton
97f6cd5d0f Pre-crop filled rects to avoid scissor 
Updates GrDrawContext to crop filled rects to the clip bounds before
creating batches for them. Also adds clipping logic to ignore scissor
when the draw falls completely inside. These two changes combined
reduce API traffic and improve batching.

In the future this can and should be improved by switching to floating
point clip boundaries, thus allowing us to throw out non pixel aligned
rectangle clips as well.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2132073002

Committed: https://skia.googlesource.com/skia/+/7969838702135b9f127bd738728da61bc49b050a
Committed: https://skia.googlesource.com/skia/+/86de59f4a99b5f54be0483c60ff0335be55b2bdf
Review-Url: https://codereview.chromium.org/2132073002
 2016-07-13 13:37:08 -07:00
robertphillips
dda54455a2 Remove GrLayerHoister 
This relies on https://codereview.chromium.org/1944013002/ (Add legacy flag to allow Skia to remove Ganesh layer hoister) landing first so as to not break the DEPS roll.

GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1950523002

Review-Url: https://codereview.chromium.org/1950523002
 2016-07-13 13:27:16 -07:00
bungeman
82945560e6 Disable embedded bitmap test on iOS. 
The TypefaceRenderingGM crashes on iOS when drawing an embedded
bitmap when requesting aliased rendering. The crash looks like

libTrueTypeScaler.dylib`<redacted> + 80
stop reason = EXC_BAD_ACCESS (code=EXC_ARM_DA_ALIGN, address=...)
->  0x330b19d0 <+80>: strd   r2, r3, [r5, #36]
    0x330b19d4 <+84>: movs   r3, #0x0
    0x330b19d6 <+86>: add    r2, sp, #0x28
    0x330b19d8 <+88>: ldr    r0, [r4, #0x4]

Disable testing embedded bitmaps on iOS for now.

BUG=skia:5530

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2140383004

Review-Url: https://codereview.chromium.org/2140383004
 2016-07-13 10:57:24 -07:00
msarett
ba3880fa6d Revert of Pre-crop filled rects to avoid scissor (patchset #6 id:100001 of https://codereview.chromium.org/2132073002/ ) 
Reason for revert:
I think this is still causing a test failure on Chrome windows bots.

https://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_x64_rel_ng/builds/243928/steps/cc_unittests%20%28with%20patch%29%20on%20Windows-7-SP1/logs/stdio

Original issue's description:
> Pre-crop filled rects to avoid scissor
>
> Updates GrDrawContext to crop filled rects to the clip bounds before
> creating batches for them. Also adds clipping logic to ignore scissor
> when the draw falls completely inside. These two changes combined
> reduce API traffic and improve batching.
>
> In the future this can and should be improved by switching to floating
> point clip boundaries, thus allowing us to throw out non pixel aligned
> rectangle clips as well.
>
> BUG=skia:
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2132073002
>
> Committed: https://skia.googlesource.com/skia/+/7969838702135b9f127bd738728da61bc49b050a
> Committed: https://skia.googlesource.com/skia/+/86de59f4a99b5f54be0483c60ff0335be55b2bdf

TBR=bsalomon@google.com,robertphillips@google.com,csmartdalton@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review-Url: https://codereview.chromium.org/2140253004
 2016-07-12 18:48:21 -07:00
reed
7c70d7cfa2 center glyphs for text-on-path-via-rsxform 
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2137083005

Review-Url: https://codereview.chromium.org/2137083005
 2016-07-12 15:06:33 -07:00