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57 Commits

Author SHA1 Message Date
sugoi
ce686270f5 Adding 3D lut color filter 
Included in this cl is support for 3D textures.

BUG=skia:

Review URL: https://codereview.chromium.org/580863004
 2014-10-09 05:27:23 -07:00
reed
a6cac4ce38 rename gradients private BitmapCache to GradientBitmapCache 
R=caryclark@google.com
NOTREECHECKS=True

Author: reed@google.com

Review URL: https://codereview.chromium.org/474983005
 2014-08-21 10:50:25 -07:00
reed
5b1b2dbe76 remove SkStippleMaskFilter - no external clients 
TBR=

Author: reed@google.com

Review URL: https://codereview.chromium.org/462013002
 2014-08-12 05:50:10 -07:00
senorblanco
7bf1068473 Remove SkBicubicImageFilter, and all related tests. 
Now that we have SkResizeImageFilter, and the bicubic
resizing is part of skia proper, there's no need for a
specialized image filter.

BUG=skia:
R=bsalomon@google.com

Author: senorblanco@chromium.org

Review URL: https://codereview.chromium.org/357793002
 2014-06-25 14:39:06 -07:00
commit-bot@chromium.org
ddb9331443 remove reference to (deleted) SkKernel33MaskFilter 
BUG=skia:
R=caryclark@google.com

Author: reed@google.com

Review URL: https://codereview.chromium.org/281163002

git-svn-id: http://skia.googlecode.com/svn/trunk@14738 2bbb7eff-a529-9590-31e7-b0007b416f81
 2014-05-14 17:42:42 +00:00
commit-bot@chromium.org
e003aecb30 remove unused Kernel33MaskFilter 
R=robertphillips@google.com
TBR=robertphilips@google.com

Author: reed@google.com

Review URL: https://codereview.chromium.org/280233002

git-svn-id: http://skia.googlecode.com/svn/trunk@14691 2bbb7eff-a529-9590-31e7-b0007b416f81
 2014-05-12 13:35:55 +00:00
commit-bot@chromium.org
b554440543 Remove SkResizeImageFilter. 
Its functionality has been subsumed by SkMatrixImageFilter, and it's no longer
used in Blink.

BUG=skia:
R=bsalomon@google.com

Author: senorblanco@chromium.org

Review URL: https://codereview.chromium.org/222923005

git-svn-id: http://skia.googlecode.com/svn/trunk@14073 2bbb7eff-a529-9590-31e7-b0007b416f81
 2014-04-07 15:11:08 +00:00
commit-bot@chromium.org
aa64fbfd34 Pull Gpu shader out of SkTwoPointConicalGradient into own file 
BUG=skia:
R=bsalomon@google.com

Author: egdaniel@google.com

Review URL: https://codereview.chromium.org/222943002

git-svn-id: http://skia.googlecode.com/svn/trunk@14044 2bbb7eff-a529-9590-31e7-b0007b416f81
 2014-04-03 14:59:19 +00:00
senorblanco@chromium.org
fd0ec2c76a Implement a generic matrix transform image filter. 
This will be used in Blink to accommodate matrices that contain
rotation or shearing. This is a generalization of SkResizeImageFilter,
so I've replaced all uses of SkResizeImageFilter in Skia. (It might be
easier to review by diffing it with SkResizeImageFilter, too.)

R=reed@google.com

Review URL: https://codereview.chromium.org/211103006

git-svn-id: http://skia.googlecode.com/svn/trunk@13941 2bbb7eff-a529-9590-31e7-b0007b416f81
 2014-03-25 17:35:10 +00:00
commit-bot@chromium.org
0a74106aaa fix bad gyp file move 
BUG=skia:
R=robertphillips@google.com

Author: humper@google.com

Review URL: https://codereview.chromium.org/151353004

git-svn-id: http://skia.googlecode.com/svn/trunk@13264 2bbb7eff-a529-9590-31e7-b0007b416f81
 2014-01-31 16:16:22 +00:00
commit-bot@chromium.org
cf34bc0634 patch from issue 119343003 
compile on 10.6, exclude failing gms

Sorry for making another CL; rebasing ToT on the old one ended up with code in a tangled mess; was easier to start over.

NOTRY=true
R=bsalomon@google.com, epoger@google.com, reed@google.com

Author: humper@google.com

Review URL: https://codereview.chromium.org/148883005

git-svn-id: http://skia.googlecode.com/svn/trunk@13238 2bbb7eff-a529-9590-31e7-b0007b416f81
 2014-01-30 15:34:43 +00:00
commit-bot@chromium.org
dcfa9ff57c Revert of Fast blurred rectangles on GPU (https://codereview.chromium.org/119343003/) 
Reason for revert:
Two problems:

1. broke compile on Build-Mac10.6-* bots
2. broke GM expectations on many bots

We'll need to examine the GM impact before re-landing.  I can work with you to do this on Tuesday if you like; just IM or email me.

Original issue's description:
> Perform the same analytic blur calculation on the GPU that we do on the CPU.  Results in significant performance gains when using Ganesh to render drop shadows in Chrome.
>
> BUG=
>
> Committed: http://code.google.com/p/skia/source/detail?r=13210

R=bsalomon@google.com, reed@google.com, humper@google.com, rmistry@google.com
TBR=bsalomon@google.com, humper@google.com, reed@google.com
NOTREECHECKS=true
NOTRY=true
BUG=

Author: epoger@google.com

Review URL: https://codereview.chromium.org/140853008

git-svn-id: http://skia.googlecode.com/svn/trunk@13213 2bbb7eff-a529-9590-31e7-b0007b416f81
 2014-01-28 01:55:24 +00:00
commit-bot@chromium.org
d1829151a5 Perform the same analytic blur calculation on the GPU that we do on the CPU. Results in significant performance gains when using Ganesh to render drop shadows in Chrome. 
BUG=
R=bsalomon@google.com, reed@google.com

Author: humper@google.com

Review URL: https://codereview.chromium.org/119343003

git-svn-id: http://skia.googlecode.com/svn/trunk@13210 2bbb7eff-a529-9590-31e7-b0007b416f81
 2014-01-27 22:41:45 +00:00
senorblanco@chromium.org
a612d4c513 Implement a resize image filter. This is needed for the "filterRes" feature in SVG filter effects, which specifies the required size for intermediate processing buffers. In order to make this work, we need to render the primitive at the given resolution (doable at the callsite in Blink), and then to resize the result to the actual on-screen size. The latter is where this filter comes in. 
It simply applies a scaling factor (and the current CTM) to its input, and draws its input bitmap at that size.

R=reed@google.com

Committed: https://code.google.com/p/skia/source/detail?r=13077
Reverted: https://code.google.com/p/skia/source/detail?r=13078

BUG=

Review URL: https://codereview.chromium.org/136863006

git-svn-id: http://skia.googlecode.com/svn/trunk@13082 2bbb7eff-a529-9590-31e7-b0007b416f81
 2014-01-15 04:49:18 +00:00
senorblanco@chromium.org
96673a918d Revert "Implement a resize image filter." 
This reverts commit 3f996e31c7043929fc1553b9b5ecd6a82b5fe125 (r13077).

TBR=reed

Review URL: https://codereview.chromium.org/136793012

git-svn-id: http://skia.googlecode.com/svn/trunk@13078 2bbb7eff-a529-9590-31e7-b0007b416f81
 2014-01-14 22:55:04 +00:00
senorblanco@chromium.org
535e1ccbd0 Implement a resize image filter. This is needed for the "filterRes" feature in SVG filter effects, which specifies the required size for intermediate processing buffers. In order to make this work, we need to render the primitive at the given resolution (doable at the callsite in Blink), and then to resize the result to the actual on-screen size. The latter is where this filter comes in. 
It simply applies a scaling factor (and the current CTM) to its input, and draws its input bitmap at that size.

R=reed@google.com

Review URL: https://codereview.chromium.org/136863006

git-svn-id: http://skia.googlecode.com/svn/trunk@13077 2bbb7eff-a529-9590-31e7-b0007b416f81
 2014-01-14 22:20:48 +00:00
commit-bot@chromium.org
40eb3c1000 Add AlphaThreshold filter. 
This is based on the Bitmap Alpha Threshold filter, and will be used by Chromium
to implement the window shape API.

R=bsalomon@chromium.org, wez@chromium.org, bsalomon@google.com, reed@google.com

Author: zork@chromium.org

Review URL: https://codereview.chromium.org/115633002

git-svn-id: http://skia.googlecode.com/svn/trunk@12935 2bbb7eff-a529-9590-31e7-b0007b416f81
 2014-01-06 23:41:14 +00:00
commit-bot@chromium.org
9cfa287bc7 Remove SkBitmapAlphaThresholdShader 
R=bsalomon@google.com

Author: zork@chromium.org

Review URL: https://codereview.chromium.org/108653012

git-svn-id: http://skia.googlecode.com/svn/trunk@12759 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-12-18 21:58:53 +00:00
senorblanco@chromium.org
533330065a Implement an SkPicture image filter source. This is required for the external-SVG reference feature of feImage. It simply plays back an SkPicture to a given destination rect. 
R=reed@google.com

Review URL: https://codereview.chromium.org/114263002

git-svn-id: http://skia.googlecode.com/svn/trunk@12661 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-12-12 23:28:52 +00:00
senorblanco@chromium.org
9c5435de44 Revert "Implement an SkPicture image filter source. This is required for the external-SVG reference feature of feImage. It simply plays back an SkPicture to a given destination rect." 
This reverts commit a620349a24471546ad2e8f0679774c1f5b4de0a4 (r12656).

git-svn-id: http://skia.googlecode.com/svn/trunk@12657 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-12-12 22:23:32 +00:00
senorblanco@chromium.org
14e21270f5 Implement an SkPicture image filter source. This is required for the external-SVG reference feature of feImage. It simply plays back an SkPicture to a given destination rect. 
R=reed@google.com

Review URL: https://codereview.chromium.org/114263002

git-svn-id: http://skia.googlecode.com/svn/trunk@12656 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-12-12 22:00:34 +00:00
commit-bot@chromium.org
611fde182a Remove the comments settings for vim tab width and expansion variables. 
These add unnecessary bloat for everyone to carry around, so we just
remove them now.

The same change was made in chromium by Tony in
http://codereview.chromium.org/7310019 - crrev.com/92046

BUG=None
TEST=./gyp_skia
R=mtklein@google.com

Author: tfarina@chromium.org

Review URL: https://codereview.chromium.org/92673003

git-svn-id: http://skia.googlecode.com/svn/trunk@12443 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-12-02 22:23:03 +00:00
commit-bot@chromium.org
1108fc3058 Remove SkLumaXfermode. 
Possibly the shortest-lived Skia feature, SkLumaXfermode is now replaced
by a color filter implementation (SkLumaColorFilter). All known existing
clients (Blink) have been converted.

R=reed@google.com

Author: fmalita@chromium.org

Review URL: https://codereview.chromium.org/26916002

git-svn-id: http://skia.googlecode.com/svn/trunk@11750 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-10-14 13:11:11 +00:00
commit-bot@chromium.org
6c1ee2d4e7 Luminance-to-alpha color filter (SkLumaColorFilter). 
Adding a color filter luma implementation. The plan is to convert
existing clients and then deprecate SkLumaXfermode.

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

Author: fmalita@chromium.org

Review URL: https://codereview.chromium.org/25453004

git-svn-id: http://skia.googlecode.com/svn/trunk@11636 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-10-07 18:00:17 +00:00
commit-bot@chromium.org
1a4fb70c8a Moving 4 SkImageFilter derived classes from blink to skia 
There were 4 classes in blink that derived from SkImageFilter :
- TileImageFilter -> SkTileImageFilter
- OffsetImageFilter -> SkOffsetImageFilter (already existed)
- FloodImageFilter -> SkFloodImageFilter
- CompositeImageFilter -> SkCompositeImageFilter

All functions were copied as is, without modification (except for warnings fixes), except for the offset filter, which was merged into the existing SkOffsetImageFilter class, as a special case when a crop rect is provided. Since the names won't clash with the names in blink, it should be easy to integrate them in blink later and fix issues, if needed.

BUG=
R=senorblanco@google.com, senorblanco@chromium.org, bsalomon@google.com, reed@google.com, mtklein@google.com

Author: sugoi@chromium.org

Review URL: https://chromiumcodereview.appspot.com/24157005

git-svn-id: http://skia.googlecode.com/svn/trunk@11475 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-09-26 16:09:28 +00:00
commit-bot@chromium.org
91a798f121 alpha threshold bitmap shader 
Committed: http://code.google.com/p/skia/source/detail?r=11122

R=reed@google.com

Author: bsalomon@google.com

Review URL: https://chromiumcodereview.appspot.com/23707019

git-svn-id: http://skia.googlecode.com/svn/trunk@11131 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-09-06 15:31:06 +00:00
bsalomon@google.com
67db510c9c Revert "alpha threshold bitmap shader" 
This reverts commit r11122.

git-svn-id: http://skia.googlecode.com/svn/trunk@11123 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-09-05 22:48:05 +00:00
commit-bot@chromium.org
4ec4cf93b7 alpha threshold bitmap shader 
R=reed@google.com

Author: bsalomon@google.com

Review URL: https://chromiumcodereview.appspot.com/23707019

git-svn-id: http://skia.googlecode.com/svn/trunk@11122 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-09-05 21:54:04 +00:00
commit-bot@chromium.org
eaa7797990 Add luminance mask transfer modes. 
This adds kSrcInLum_Mode and kDstInLum_Mode, to support CSS and SVG luminance masks (http://www.w3.org/TR/css-masking/#MaskValues , http://www.w3.org/TR/SVG/masking.html#Masking ).

The transfer coefficient is computed according to http://www.w3.org/TR/2011/REC-SVG11-20110816/filters.html#feColorMatrixElement "luminance-to-alpha":

  luma = 0.2125 * r + 0.7154 * g + 0.0721 * b


R=bsalomon@google.com, reed@google.com, robertphillips@google.com, vandebo@chromium.org

Author: fmalita@chromium.org

Review URL: https://chromiumcodereview.appspot.com/22918012

git-svn-id: http://skia.googlecode.com/svn/trunk@10887 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-08-23 13:13:12 +00:00
junov@chromium.org
f44fcdca01 Upstreaming DropShadowImageFilter into skia, from Blink 
GM imagefiltersbase will need rebaselining after this change

R=senorblanco@chromium.org

Committed: https://code.google.com/p/skia/source/detail?r=10583

Review URL: https://codereview.chromium.org/22258005

git-svn-id: http://skia.googlecode.com/svn/trunk@10626 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-08-07 20:00:55 +00:00
commit-bot@chromium.org
1c4c9ef437 Move SkComposeImageFilter into its own {.h, .cpp} files 
In http://crrev.com/21154002, SkComposeImageFilter will be used
outside of tests. Consequently, this moves SkComposeImageFilter from
SkTestImageFilters.{h, cpp} into its own {.h, .cpp} files.

BUG=181613
R=senorblanco@chromium.org

Author: ajuma@chromium.org

Review URL: https://chromiumcodereview.appspot.com/22438003

git-svn-id: http://skia.googlecode.com/svn/trunk@10591 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-08-07 00:07:51 +00:00
jvanverth@google.com
9c8b4eaf28 Reverting r10583: Upstreaming DropShadowImageFilter into skia, from Blink 
git-svn-id: http://skia.googlecode.com/svn/trunk@10587 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-08-06 21:12:59 +00:00
junov@chromium.org
d8e4024719 Upstreaming DropShadowImageFilter into skia, from Blink 
GM imagefiltersbase will need rebaselining after this change

R=senorblanco@chromium.org

Review URL: https://codereview.chromium.org/22258005

git-svn-id: http://skia.googlecode.com/svn/trunk@10583 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-08-06 20:01:40 +00:00
senorblanco@chromium.org
350b4d50ea Remove SkBlendImageFilter, and all tests. Its functionality has been subsumed by SkXfermodeImageFilter. 
R=robertphillips@google.com

Review URL: https://codereview.chromium.org/21404002

git-svn-id: http://skia.googlecode.com/svn/trunk@10482 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-08-01 14:59:05 +00:00
robertphillips@google.com
736dd031f1 Move gaussianBlur functionality to src\effects 
https://codereview.chromium.org/18771004/



git-svn-id: http://skia.googlecode.com/svn/trunk@10080 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-07-15 15:06:54 +00:00
senorblanco@chromium.org
86fc266eda Implement SkXfermode image filter. This required changing the signature of SkXfermode::asNewEffectOrCoeffs(), to add an optional background texture. 
For the raster path, we do a straightforward 2-pass method: draw background, then composite the foreground over it.

For the GPU path, if the xfermode can be expressed as an effect, we build an effect with the background texture incorporated, then do a single-pass draw fetching both foreground and background textures, and compositing to the result. If the xfermode is expressed as src/dst coefficients, we do a 2-pass draw as in the raster path and use fixed-function blending.

R=bsalomon@google.com, reed@google.com

Review URL: https://codereview.chromium.org/16125008

git-svn-id: http://skia.googlecode.com/svn/trunk@9373 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-05-31 17:49:12 +00:00
reed@google.com
b83cb9bf89 add SkLerpXfermode 
BUG=
R=bsalomon@google.com

Review URL: https://codereview.chromium.org/15602003

git-svn-id: http://skia.googlecode.com/svn/trunk@9229 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-05-21 21:33:11 +00:00
senorblanco@chromium.org
d043ccee37 Allow single-pass filters (which use asNewEffect()) to participate in the image filter DAG. This was done by introducing the SkSinglePassImageFilter abstract base class, which implements canFilterImageGPU() and filterImageGPU() on behalf of the derived class. The derived class still only needs to asNewEffect(). This allows us to recurse on the filter input in SkSinglePassImageFilter::onFilterImageGPU(). It also allows us to remove any knowledge of single-pass image filters from SkGpuDevice and from the SkImageFilter base class as well. 
BUG=

Review URL: https://codereview.chromium.org/13602013

git-svn-id: http://skia.googlecode.com/svn/trunk@8563 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-04-08 19:43:22 +00:00
sugoi@google.com
e3b4c5097a New SVG turbulence in Skia 
This cl contains the code for CPU generation of noise.

TEST:Added 'perlinnoise' gm
Review URL: https://codereview.chromium.org/13094003

git-svn-id: http://skia.googlecode.com/svn/trunk@8541 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-04-05 13:47:09 +00:00
robertphillips@google.com
8cf10efe75 Reverting r8376, r8373 and r8371 due to Android shader compilation failures 
git-svn-id: http://skia.googlecode.com/svn/trunk@8378 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-03-25 22:16:02 +00:00
sugoi@google.com
2daa365123 New SVG turbulence in Skia 
This cl contains the code for both CPU and GPU generation of noise. Both
codepaths yield equivalent results.

TEST:Added 'perlinnoise' gm
Review URL: https://codereview.chromium.org/13047005

git-svn-id: http://skia.googlecode.com/svn/trunk@8371 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-03-25 19:31:04 +00:00
robertphillips@google.com
b7636d3fad Reverting 8313 (SVG turbulence) due to Ubuntu failures 
git-svn-id: http://skia.googlecode.com/svn/trunk@8316 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-03-21 21:22:03 +00:00
sugoi@google.com
3067cc904d New SVG turbulence in Skia 
This cl contains the code for both CPU and GPU generation of noise. Both codepaths yield equivalent results.

TEST:Added 'perlinnoise' gm
Review URL: https://codereview.appspot.com/7322060

git-svn-id: http://skia.googlecode.com/svn/trunk@8313 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-03-21 21:01:07 +00:00
sugoi@google.com
a1c511b870 New SkRectShaderImageFilter image filter 
This new changelist also introduces a new image filter called SkRectShaderImageFilter which is make to simply apply a shader on a region without using any inputs.

TEST=Added ShaderImageFilter test
Review URL: https://codereview.appspot.com/7300046

git-svn-id: http://skia.googlecode.com/svn/trunk@7808 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-02-21 15:02:28 +00:00
senorblanco@chromium.org
377c14a1e6 Nuke SkSingleInputImageFilter. 99% of its functionality was refactored into SkImageFilterUtils in https://code.google.com/p/skia/source/detail?r=7467, so it has outlived its usefulness. 
Review URL: https://codereview.appspot.com/7277055

git-svn-id: http://skia.googlecode.com/svn/trunk@7563 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-02-04 22:57:21 +00:00
robertphillips@google.com
8857e7c460 Add SkImageFilterUtils.h to effects.gypi 
git-svn-id: http://skia.googlecode.com/svn/trunk@7479 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-01-31 00:03:27 +00:00
senorblanco@chromium.org
c2594f4106 This changes the signature of SkImageFilter::filterImageGPU() to use SkBitmaps for input and output, and removes the rect param. This allows us to return textures which are larger than the actual result, such as when GrAutoScratchTextures are used. The SkBitmap's size represents the active region, while the GrTexture's size is the full texture size. 
This fixes the bicubic image filter GM on the GPU, which otherwise draws garbage outside the filtered region.  It also moves us closer to unifying the signatures of SkImageFilter::onFilterImage() and SkImageFilter::filterImageGPU().

Review URL: https://codereview.appspot.com/7180048

git-svn-id: http://skia.googlecode.com/svn/trunk@7467 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-01-30 19:08:47 +00:00
senorblanco@chromium.org
3f2d45aff6 (Relanding r7275 with assert fix, plus fixes from r7276, r7280, r7283.) 
Implement a bicubic resampling image filter, with raster and GPU backends.
In order to get this to work on the GPU side, I had to modify the width and height of the drawn texture in drawSprite() and drawDevice() to use the filtered texture's dimensions, instead of the source texture.  (This wasn't a problem before since all other image filters produce results the same dimensions as their input texture.)
For now, this implementation only does axis-aligned scaling (same as the Lanczos-3 implementation in Chrome).  It's also done for correctness and clarity, not speed, so there are lots of opportunities for speedups.

Committed: https://code.google.com/p/skia/source/detail?r=7275

Review URL: https://codereview.appspot.com/7033049

git-svn-id: http://skia.googlecode.com/svn/trunk@7287 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-01-18 20:48:20 +00:00
robertphillips@google.com
c51f752554 Reverting chain of SkBicubicImageFilter changes (7275, 7276, 7280 & 7283) 
git-svn-id: http://skia.googlecode.com/svn/trunk@7285 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-01-18 19:20:52 +00:00
senorblanco@chromium.org
744820e657 Implement a bicubic resampling image filter, with raster and GPU backends. 
In order to get this to work on the GPU side, I had to modify the width and height of the drawn texture in drawSprite() and drawDevice() to use the filtered texture's dimensions, instead of the source texture.  (This wasn't a problem before since all other image filters produce results the same dimensions as their input texture.)
For now, this implementation only does axis-aligned scaling (same as the Lanczos-3 implementation in Chrome).  It's also done for correctness and clarity, not speed, so there are lots of opportunities for speedups.

Review URL: https://codereview.appspot.com/7033049

git-svn-id: http://skia.googlecode.com/svn/trunk@7275 2bbb7eff-a529-9590-31e7-b0007b416f81
 2013-01-18 17:29:15 +00:00