Commit Graph

1944 Commits

Author SHA1 Message Date
mtklein
2766c00fc0 remove SkInstCnt
It's been outclassed by Valgrind and leak sanitizer,
and it seems to be causing problems for external folks building Skia.

I'm not sure why our own builds seem unaffected.

Latest thread:
https://groups.google.com/forum/#!topic/skia-discuss/oj9FsQwwSF0

BUG=skia:

Review URL: https://codereview.chromium.org/1217573002
2015-06-26 11:45:03 -07:00
mtklein
46043ee50f Kill mixedxfermodes
It's too random to be helpful.

BUG=skia:

Review URL: https://codereview.chromium.org/1215703005
2015-06-26 11:43:30 -07:00
robertphillips
157bcd0840 Fix SkTileImageFilter clipping/cropRect interaction issue
BUG=499499

Review URL: https://codereview.chromium.org/1210053003
2015-06-26 08:07:39 -07:00
reed
f9ad558943 Revert of Revert of Return GrGLContext from GrTestTarget (patchset #1 id:1 of https://codereview.chromium.org/1211123004/)
Reason for revert:
un-referting, did not help DEPS roll

Original issue's description:
> Revert of Return GrGLContext from GrTestTarget (patchset #3 id:40001 of https://codereview.chromium.org/1207393002/)
>
> Reason for revert:
> speculative revert to unblock DEPS roll (layout-tests)
>
> Original issue's description:
> > Return GrGLContext from GrTestTarget
> >
> > BUG=skia:
> >
> > Committed: https://skia.googlesource.com/skia/+/b6d93ea428ca5d13641c35faca7d0380980a3a17
>
> TBR=bsalomon@google.com,joshualitt@google.com,joshualitt@chromium.org
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/1852ec2b46a2a0efbb3550ff4d8b640f56a810e9

TBR=bsalomon@google.com,joshualitt@google.com,joshualitt@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/1215593002
2015-06-25 21:29:25 -07:00
reed
1852ec2b46 Revert of Return GrGLContext from GrTestTarget (patchset #3 id:40001 of https://codereview.chromium.org/1207393002/)
Reason for revert:
speculative revert to unblock DEPS roll (layout-tests)

Original issue's description:
> Return GrGLContext from GrTestTarget
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/b6d93ea428ca5d13641c35faca7d0380980a3a17

TBR=bsalomon@google.com,joshualitt@google.com,joshualitt@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/1211123004
2015-06-25 18:59:32 -07:00
joshualitt
b6d93ea428 Return GrGLContext from GrTestTarget
BUG=skia:

Review URL: https://codereview.chromium.org/1207393002
2015-06-25 15:02:22 -07:00
reed
4c21dc5ddf add drawImageNine
this also exposes nine-patch drawing directly to devices, and creates a shared iterator for unrolling a nine-patch into single rect->rect draws.

BUG=skia:

Review URL: https://codereview.chromium.org/1211583003
2015-06-25 12:32:03 -07:00
reed
71c3c760a8 add SkCanvas::drawAtlas
BUG=skia:

Review URL: https://codereview.chromium.org/1181913003
2015-06-24 10:29:18 -07:00
reed
5fbb623099 add more tests
BUG=skia:
TBR=

Review URL: https://codereview.chromium.org/1201333002
2015-06-23 14:34:58 -07:00
robertphillips
da57105708 Fix memory leak in simple-offsetimagefilter
Review URL: https://codereview.chromium.org/1203613004
2015-06-23 09:28:52 -07:00
reed
b3fe1b87e0 more tests for offsetimagefilter
BUG=skia:

Review URL: https://codereview.chromium.org/1199933011
2015-06-23 08:29:20 -07:00
robertphillips
702edbd4bc Propagate SkSurfaceProps to more call sites
Start moving to a world where everyone provides surface properties.

Most notably this exposes a portion of SkSurfaceProps to the C API.

BUG=skia:3934

Review URL: https://codereview.chromium.org/1195003003
2015-06-23 06:26:08 -07:00
reed
477fdd8aa4 add simple test for offsetimagefilter
BUG=skia:
TBR=

Review URL: https://codereview.chromium.org/1204723002
2015-06-23 06:01:10 -07:00
reed
871872f3f2 change old picture serialization to really handle images
BUG=skia:3965

Review URL: https://codereview.chromium.org/1199473002
2015-06-22 12:48:26 -07:00
robertphillips
9a53fd7c41 Begin kLegacyFontHost_InitType cleanup
This CL starts the process of pushing kLegacyFontHost_InitType-type SkSurfaceProps up the call stack and out of Skia. It:

 Gets rid of the default SkBaseDevice ctor. This means everyone has to always hand an explicit SkSurfaceProps to it.

 It makes public the SkBitmapDevice creation methods that require SkSurfaceProps.

 Removes (in Skia's code base) all SkBitmapDevice ctor calls w/o SkSurfaceProps.

 Makes the "recording" canvases (e.g., pdf, svg, xps) explicitly not use kLegacyFontHost_InitType.

 Replicates the creating canvas/device's flags on saveLayer devices

BUG=skia:3934

Review URL: https://codereview.chromium.org/1204433002
2015-06-22 09:46:59 -07:00
reed
462a33c7ac clean offsetimagefilter gm
BUG=skia:
TBR=robertphilips

Review URL: https://codereview.chromium.org/1203473002
2015-06-22 09:10:14 -07:00
jvanverth
34d7288b19 Change large glyph check back to > threshold.
Using >= misses some Chromium test cases that are still
being rendered as paths.

BUG=chromium:467569

Review URL: https://codereview.chromium.org/1202433002
2015-06-22 08:08:09 -07:00
jvanverth
4854d13c27 Remove distance field flag from SkPaint
Review URL: https://codereview.chromium.org/1192413005
2015-06-22 06:46:56 -07:00
robertphillips
c3176aa5e5 Fix dst bound reported by SkTileImageFilter
In the example from the bug we had the filter DAG:

color filter (table)
    0: xfermode filter (arith)
        0: tile filter [0,80,34,114] -> [0,80,800,480]
             0: color filter (table)
                 0: bitmap src 34x34 -> [0,80,34,114]
        1: color filter (table)
             0: picture filter [0, 80, 800, 480]

computeFastBounds was coming out of the DAG with a bound of [0,80,34,114] which didn't represent the pixels that would be drawn.

This CL updates SkTileImageFilter to correctly set the bound for the pixels it will hit.

BUG=493783

Committed: https://skia.googlesource.com/skia/+/05be93bbdf09576f7903130e3b106b0a8c7c4b4e

Committed: https://skia.googlesource.com/skia/+/0be685755f942baea26c66a87226b569fc17e960

Review URL: https://codereview.chromium.org/1152553006
2015-06-16 09:44:56 -07:00
fmalita
109a23d64f Remove the SkCanvas comment API
No longer used in Chromium/Blink.

R=reed@google.com,robertphillips@google.com,mtklein@google.com

Review URL: https://codereview.chromium.org/1153593003
2015-06-15 13:15:31 -07:00
caryclark
65cdba6ba7 Revert of Revert of make gm background colors 565 compatible (patchset #1 id:1 of https://codereview.chromium.org/1184123002/)
Reason for revert:
underlying problem with portable refs deleted more than once fixed

Original issue's description:
> Revert of make gm background colors 565 compatible (patchset #2 id:20001 of https://codereview.chromium.org/1176243006/)
>
> Reason for revert:
> breaks many bots with refcnt error
>
> Original issue's description:
> > make gm background colors 565 compatible
> >
> > Change a batch of GM tests to convert their background color
> > so that it is representable in 8888 and 565.
> >
> > Enable portable text in those same tests to minimize platform
> > differences.
> >
> > In a couple of bitmap tests, use portable typefaces instead of
> > choosing 'Times' which may or may not be available on the platform.
> >
> > R=borenet@google.com
> >
> > Committed: https://skia.googlesource.com/skia/+/be7f768a357aefb39c42d24b81b24d647bb6ab70
>
> TBR=borenet@google.com
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
>
> Committed: https://skia.googlesource.com/skia/+/0bdb08b1ba8fbd18c4838f86a23f1ef4b3a3bfdf

TBR=borenet@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1182403003
2015-06-15 06:51:08 -07:00
caryclark
0bdb08b1ba Revert of make gm background colors 565 compatible (patchset #2 id:20001 of https://codereview.chromium.org/1176243006/)
Reason for revert:
breaks many bots with refcnt error

Original issue's description:
> make gm background colors 565 compatible
>
> Change a batch of GM tests to convert their background color
> so that it is representable in 8888 and 565.
>
> Enable portable text in those same tests to minimize platform
> differences.
>
> In a couple of bitmap tests, use portable typefaces instead of
> choosing 'Times' which may or may not be available on the platform.
>
> R=borenet@google.com
>
> Committed: https://skia.googlesource.com/skia/+/be7f768a357aefb39c42d24b81b24d647bb6ab70

TBR=borenet@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1184123002
2015-06-15 05:28:00 -07:00
caryclark
be7f768a35 make gm background colors 565 compatible
Change a batch of GM tests to convert their background color
so that it is representable in 8888 and 565.

Enable portable text in those same tests to minimize platform
differences.

In a couple of bitmap tests, use portable typefaces instead of
choosing 'Times' which may or may not be available on the platform.

R=borenet@google.com

Review URL: https://codereview.chromium.org/1176243006
2015-06-15 05:09:59 -07:00
caryclark
82fecd4d53 make drawlooper portable
TBR=djsollen@google.com

Review URL: https://codereview.chromium.org/1187603002
2015-06-12 13:41:02 -07:00
caryclark
6eba305422 remove lcd
TBR=djsollen@google.com

Review URL: https://codereview.chromium.org/1183753002
2015-06-12 12:25:26 -07:00
caryclark
d85093c28f make emptypath portable; add 565 color utility
R=djsollen@google.com

Review URL: https://codereview.chromium.org/1182833004
2015-06-12 11:49:04 -07:00
caryclark
ceb9f3b389 update complexclip to portable
TBR=djsollen@google.com

Review URL: https://codereview.chromium.org/1179713007
2015-06-12 10:00:11 -07:00
caryclark
57856a1f58 convert cubicpaths gm tests to portable
TBR=djsollen

Review URL: https://codereview.chromium.org/1182113002
2015-06-12 08:54:38 -07:00
caryclark
7e85216104 fix portable text in test
TBR=djsollen@google.com

Review URL: https://codereview.chromium.org/1179173003
2015-06-12 08:18:45 -07:00
caryclark
ceadfefb93 next batch of portable typeface changes
TBR=djsollen@google.com

Review URL: https://codereview.chromium.org/1177303005
2015-06-12 05:42:58 -07:00
reed
026beb52a2 SkPath::Direction serves two masters:
- input param to addFoo (e.g. addRect), where only CW or CCW are valid)
- output param from computing functions, that sometimes return kUnknown

This CL's intent is to split these into distinct enums/features:
- Direction (public) loses kUnknown, and is only used for input
- FirstDirection (private) is used for computing the first direction we see when analyzing a contour

BUG=skia:

Review URL: https://codereview.chromium.org/1176953002
2015-06-10 14:23:15 -07:00
caryclark
d3c162200f turn on antialiased text
Aliased text didn't work with msaa16, so make it all
antialiased.

TBR=reed@google.com

Review URL: https://codereview.chromium.org/1169173006
2015-06-10 10:34:08 -07:00
caryclark
83ca628cb6 Today's gm include many differences caused by platform font implementations.
This experiment replaces the label used in the aaxfermodes gm with
aliased text generated from paths common to all platforms.

Since there is no way today to generate all dm output from trybots,
this will be checked in to confirm that this strategy provides simpler
output across devices.

This does not introduce a new public interface; instead, dm uses
a extern backdoor to install the SkTypeface::CreateFromName
handler.

Review URL: https://codereview.chromium.org/1163283002
2015-06-10 09:31:09 -07:00
reed
41e010cb90 Revert[2] SkDraw and all Blitters to use pixmap instead of bitmapi
This reverts commit b3f0ec9f99.

BUG=skia:

Review URL: https://codereview.chromium.org/1168303006
2015-06-09 12:16:53 -07:00
reed
b3f0ec9f99 Revert of change SkDraw and all Blitters to use pixmap instead of bitmap (patchset #6 id:100001 of https://codereview.chromium.org/1148793007/)
Reason for revert:
speculative revert to try to unblock DEPS roll

Original issue's description:
> change SkDraw and all Blitters to use pixmap instead of bitmap
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/c31af44336f5eb4a50e83e76e51962d46c3ed458

TBR=scroggo@google.com,jvanverth@google.com,reed@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/1164373003
2015-06-08 19:58:07 -07:00
reed
c31af44336 change SkDraw and all Blitters to use pixmap instead of bitmap
BUG=skia:

Review URL: https://codereview.chromium.org/1148793007
2015-06-08 10:47:13 -07:00
robertphillips
63195181d1 Add bigtileimagefilter GM & improvements to toString
This is all the ancillary code from https://codereview.chromium.org/1152553006/ (Fix dst bound reported by SkTileImageFilter).

TBR=reed@google.com, senorblanco@google.com

Review URL: https://codereview.chromium.org/1169713003
2015-06-08 06:21:14 -07:00
robertphillips
270fe6aad5 Revert of Fix dst bound reported by SkTileImageFilter (patchset #3 id:40001 of https://codereview.chromium.org/1152553006/)
Reason for revert:
Blink

Original issue's description:
> Fix dst bound reported by SkTileImageFilter
>
> In the example from the bug we had the filter DAG:
>
> color filter (table)
>     0: xfermode filter (arith)
>         0: tile filter [0,80,34,114] -> [0,80,800,480]
>              0: color filter (table)
>                  0: bitmap src 34x34 -> [0,80,34,114]
>         1: color filter (table)
>              0: picture filter [0, 80, 800, 480]
>
> computeFastBounds was coming out of the DAG with a bound of [0,80,34,114] which didn't represent the pixels that would be drawn.
>
> This CL updates SkTileImageFilter to correctly set the bound for the pixels it will hit.
>
> BUG=493783
>
> Committed: https://skia.googlesource.com/skia/+/05be93bbdf09576f7903130e3b106b0a8c7c4b4e
>
> Committed: https://skia.googlesource.com/skia/+/0be685755f942baea26c66a87226b569fc17e960

TBR=reed@google.com,senorblanco@google.com,senorblanco@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=493783

Review URL: https://codereview.chromium.org/1156583004
2015-06-04 11:15:27 -07:00
caryclark
99a69eb152 make test hittestpath random calls deterministic
R=bsalomon@google.com

Review URL: https://codereview.chromium.org/1157943006
2015-06-04 09:27:43 -07:00
halcanary
74015ed78e Add GM that tests clipping annotations
TBR=reed@google.com

BUG=skia:3880

Review URL: https://codereview.chromium.org/1159273003
2015-06-04 07:26:54 -07:00
robertphillips
0be685755f Fix dst bound reported by SkTileImageFilter
In the example from the bug we had the filter DAG:

color filter (table)
    0: xfermode filter (arith)
        0: tile filter [0,80,34,114] -> [0,80,800,480]
             0: color filter (table)
                 0: bitmap src 34x34 -> [0,80,34,114]
        1: color filter (table)
             0: picture filter [0, 80, 800, 480]

computeFastBounds was coming out of the DAG with a bound of [0,80,34,114] which didn't represent the pixels that would be drawn.

This CL updates SkTileImageFilter to correctly set the bound for the pixels it will hit.

BUG=493783

Committed: https://skia.googlesource.com/skia/+/05be93bbdf09576f7903130e3b106b0a8c7c4b4e

Review URL: https://codereview.chromium.org/1152553006
2015-06-04 06:53:37 -07:00
robertphillips
a66cc7e1e0 Revert of Fix dst bound reported by SkTileImageFilter (patchset #3 id:40001 of https://codereview.chromium.org/1152553006/)
Reason for revert:
breaking tests

Original issue's description:
> Fix dst bound reported by SkTileImageFilter
>
> In the example from the bug we had the filter DAG:
>
> color filter (table)
>     0: xfermode filter (arith)
>         0: tile filter [0,80,34,114] -> [0,80,800,480]
>              0: color filter (table)
>                  0: bitmap src 34x34 -> [0,80,34,114]
>         1: color filter (table)
>              0: picture filter [0, 80, 800, 480]
>
> computeFastBounds was coming out of the DAG with a bound of [0,80,34,114] which didn't represent the pixels that would be drawn.
>
> This CL updates SkTileImageFilter to correctly set the bound for the pixels it will hit.
>
> BUG=493783
>
> Committed: https://skia.googlesource.com/skia/+/05be93bbdf09576f7903130e3b106b0a8c7c4b4e

TBR=reed@google.com,senorblanco@google.com,senorblanco@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=493783

Review URL: https://codereview.chromium.org/1143083006
2015-06-02 10:57:26 -07:00
robertphillips
05be93bbdf Fix dst bound reported by SkTileImageFilter
In the example from the bug we had the filter DAG:

color filter (table)
    0: xfermode filter (arith)
        0: tile filter [0,80,34,114] -> [0,80,800,480]
             0: color filter (table)
                 0: bitmap src 34x34 -> [0,80,34,114]
        1: color filter (table)
             0: picture filter [0, 80, 800, 480]

computeFastBounds was coming out of the DAG with a bound of [0,80,34,114] which didn't represent the pixels that would be drawn.

This CL updates SkTileImageFilter to correctly set the bound for the pixels it will hit.

BUG=493783

Review URL: https://codereview.chromium.org/1152553006
2015-06-02 10:52:43 -07:00
bsalomon
993a4216a6 SkImage::NewFromYUVTexturesCopy
Review URL: https://codereview.chromium.org/1149553002
2015-05-29 11:37:25 -07:00
cdalton
6fd158ea47 Implement Porter Duff XP with a blend table
Removes the runtime logic used by PorterDuffXferProcessor to decide
blend coeffs and shader outputs, and instead uses a compile-time
constant table of pre-selected blend formulas. Separates out the dst
read fallback into its own XP.

Introduces a new blend strategy for srcCoeff=0 that can apply coverage
with a reverse subtract blend equation instead of dual source
blending.

Adds new macros in GrBlend.h to analyze blend formulas both runtime.

Removes kSetCoverageDrawing_OptFlag and GrSimplifyBlend as they are no
longer used.

Adds a GM that verifies all xfermodes, including arithmetic, with the
color/coverage invariants used by Porter Duff.

Adds a unit test that verifies each Porter Duff formula with every
color/coverage invariant.

Major changes:

 * Uses a reverse subtract blend equation for coverage when srcCoeff=0
   (clear, dst-out [Sa=1], dst-in, modulate). Platforms that don't
   support dual source blending no longer require a dst copy for
   dst-in and modulate.

 * Sets BlendInfo::fWriteColor to false when the blend does not modify
   the dst. GrGLGpu will now use glColorMask instead of blending for
   these modes (dst, dst-in [Sa=1], modulate ignored for [Sc=1]).

 * Converts all SA blend coeffs to One for opaque inputs, and ISA to
   Zero if there is also no coverage. (We keep ISA around when there
   is coverage because we use it to tweak alpha for coverage.)

 * Abandons solid white optimizations for the sake of simplicity
   (screen was the only mode that previous had solid white opts).

Minor differences:

 * Inconsequential differences in opt flags (e.g. we now return
   kCanTweakAlphaForCoverage_OptFlag even when there is no coverage).

 * Src coeffs when the shader outputs 0.

 * IS2C vs IS2A when the secondary output is scalar.

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/9a70920db22b6309c671f8e5d519bb95570e4414

Review URL: https://codereview.chromium.org/1124373002
2015-05-27 15:08:33 -07:00
bsalomon
4ee6bd86c5 Add caps overrides to GMs
Review URL: https://codereview.chromium.org/1158963002
2015-05-27 13:23:23 -07:00
joshualitt
7a9c45c01c real fix for textblob use after gpu free
This patch addresses two issues:
1) Textblobs with abandoned strikes were not properly regenerating.
2) Provided by ericrk - GrTextBlobCache removed blobs from |fCache| during freeAll, but left
potentially released blobs in the |fBlobList|. We now remove these from
|fBlobList| as well.
BUG=skia:

Review URL: https://codereview.chromium.org/1160633002
2015-05-26 12:32:23 -07:00
robertphillips
ea46150344 Split drawing functionality out of GrContext and into new GrDrawContext
This is mainly a mechanical CL. There were some fiddly bits in GrContext.cpp where it no longer had access to the GrDrawTarget (and had to use the new GrDrawContext).

I've converted GrAARectRenderer & GrOvalRenderer into static classes so I could stop allocating them.

Review URL: https://codereview.chromium.org/1151283004
2015-05-26 11:38:03 -07:00
bungeman
c33db93d1b Revert of Implement Porter Duff XP with a blend table (patchset #12 id:220001 of https://codereview.chromium.org/1124373002/)
Reason for revert:
Blocking DEPS roll into Chromium. Crashing virtual/gpu/fast/canvas/canvas-composite-*.html tests with the assert

../../third_party/skia/src/gpu/gl/builders/GrGLFragmentShaderBuilder.cpp:281: failed assertion "k110_GrGLSLGeneration != gpu->glslGeneration() || fOutputs.empty()"

Original issue's description:
> Implement Porter Duff XP with a blend table
>
> Removes the runtime logic used by PorterDuffXferProcessor to decide
> blend coeffs and shader outputs, and instead uses a compile-time
> constant table of pre-selected blend formulas.
>
> Introduces a new blend strategy for srcCoeff=0 that can apply coverage
> with a reverse subtract blend equation instead of dual source
> blending.
>
> Adds new macros in GrBlend.h to analyze blend formulas both runtime.
>
> Removes kSetCoverageDrawing_OptFlag and GrSimplifyBlend as they are no
> longer used.
>
> Adds a GM that verifies all xfermodes, including arithmetic, with the
> color/coverage invariants used by Porter Duff.
>
> Adds a unit test that verifies each Porter Duff formula with every
> color/coverage invariant.
>
> Major changes:
>
>  * Uses a reverse subtract blend equation for coverage when srcCoeff=0
>    (clear, dst-out [Sa=1], dst-in, modulate). Platforms that don't
>    support dual source blending no longer require a dst copy for
>    dst-in and modulate.
>
>  * Sets BlendInfo::fWriteColor to false when the blend does not modify
>    the dst. GrGLGpu will now use glColorMask instead of blending for
>    these modes (dst, dst-in [Sa=1], modulate ignored for [Sc=1]).
>
>  * Converts all SA blend coeffs to One for opaque inputs, and ISA to
>    Zero if there is also no coverage. (We keep ISA around when there
>    is coverage because we use it to tweak alpha for coverage.)
>
>  * Abandons solid white optimizations for the sake of simplicity
>    (screen was the only mode that previous had solid white opts).
>
> Minor differences:
>
>  * Inconsequential differences in opt flags (e.g. we now return
>    kCanTweakAlphaForCoverage_OptFlag even when there is no coverage).
>
>  * Src coeffs when the shader outputs 0.
>
>  * IS2C vs IS2A when the secondary output is scalar.
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/9a70920db22b6309c671f8e5d519bb95570e4414

TBR=egdaniel@google.com,bsalomon@google.com,cdalton@nvidia.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/1153993002
2015-05-22 17:55:26 -07:00
cdalton
9a70920db2 Implement Porter Duff XP with a blend table
Removes the runtime logic used by PorterDuffXferProcessor to decide
blend coeffs and shader outputs, and instead uses a compile-time
constant table of pre-selected blend formulas.

Introduces a new blend strategy for srcCoeff=0 that can apply coverage
with a reverse subtract blend equation instead of dual source
blending.

Adds new macros in GrBlend.h to analyze blend formulas both runtime.

Removes kSetCoverageDrawing_OptFlag and GrSimplifyBlend as they are no
longer used.

Adds a GM that verifies all xfermodes, including arithmetic, with the
color/coverage invariants used by Porter Duff.

Adds a unit test that verifies each Porter Duff formula with every
color/coverage invariant.

Major changes:

 * Uses a reverse subtract blend equation for coverage when srcCoeff=0
   (clear, dst-out [Sa=1], dst-in, modulate). Platforms that don't
   support dual source blending no longer require a dst copy for
   dst-in and modulate.

 * Sets BlendInfo::fWriteColor to false when the blend does not modify
   the dst. GrGLGpu will now use glColorMask instead of blending for
   these modes (dst, dst-in [Sa=1], modulate ignored for [Sc=1]).

 * Converts all SA blend coeffs to One for opaque inputs, and ISA to
   Zero if there is also no coverage. (We keep ISA around when there
   is coverage because we use it to tweak alpha for coverage.)

 * Abandons solid white optimizations for the sake of simplicity
   (screen was the only mode that previous had solid white opts).

Minor differences:

 * Inconsequential differences in opt flags (e.g. we now return
   kCanTweakAlphaForCoverage_OptFlag even when there is no coverage).

 * Src coeffs when the shader outputs 0.

 * IS2C vs IS2A when the secondary output is scalar.

BUG=skia:

Review URL: https://codereview.chromium.org/1124373002
2015-05-22 11:36:57 -07:00