skia2/fuzz
Brian Osman adadb95a9f Better first-class shader & color filter support in runtime effects
This does a few things, because they're all intertwined:

1) SkRuntimeEffect's API now includes details about children (which Skia
   stage was declared, not just the name). The factories verify that the
   declared types in the SkSL match up with the C++ types being passed.
   Today, we still only support adding children of the same type, so the
   checks are simple. Once we allow mixing types, we'll be testing the
   declared type against the actual C++ type supplied for each slot.
2) Adds sample variants that supply the input color to the child. This
   is now the only way to invoke a colorFilter child. Internally, we
   support passing a color when invoking a child shader, but I'm not
   exposing that. It's not clearly part of the semantics of the Skia
   pipeline, and is almost never useful. It also exposes users to
   several inconsistencies (skbug.com/11942).
3) Because of #2, it's possible that we can't compute a reusable program
   to filter individual colors. In that case, we don't set the constant
   output for constant input optimization, and filterColor4f falls back
   to the slower base-class implementation.

Bug: skia:11813 skia:11942
Change-Id: I06c41e1b35056e486f3163a72acf6b9535d7fed4
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/401917
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
2021-05-04 01:29:57 +00:00
..
oss_fuzz Better first-class shader & color filter support in runtime effects 2021-05-04 01:29:57 +00:00
coverage remove SkColorSpace::MakeICC() fuzzer 2018-05-23 16:31:11 +00:00
Fuzz.cpp Hide SkImageFilter::CropRect 2021-01-30 16:10:29 +00:00
Fuzz.h Hide SkImageFilter::CropRect 2021-01-30 16:10:29 +00:00
FuzzCanvas.cpp FilterQuality should no longer be needed. 2021-03-20 14:30:06 +00:00
FuzzCommon.cpp [fuzz] Expose Region Op fuzzing to oss-fuzz. 2021-03-29 16:05:05 +00:00
FuzzCommon.h rewrite includes to not need so much -Ifoo 2019-04-24 16:27:11 +00:00
FuzzCreateDDL.cpp Handle null GrDirectContext in DDL Fuzzer 2020-07-31 18:12:53 +00:00
FuzzDDLThreading.cpp Bail if context creation fails in FuzzDDLThreadingGL 2021-03-04 03:50:26 +00:00
FuzzDrawFunctions.cpp FilterQuality should no longer be needed. 2021-03-20 14:30:06 +00:00
FuzzEncoders.cpp Add GrDirectContext arg to SkImage::readPixels 2020-08-27 19:26:29 +00:00
FuzzGradients.cpp rewrite includes to not need so much -Ifoo 2019-04-24 16:27:11 +00:00
FuzzMain.cpp Activate FuzzDDLThreading 2021-02-25 21:26:07 +00:00
FuzzParsePath.cpp rewrite includes to not need so much -Ifoo 2019-04-24 16:27:11 +00:00
FuzzPath.cpp add SKPath::readFromMemory() fuzzer 2020-08-12 17:40:16 +00:00
FuzzPathMeasure.cpp [fuzz] Standardize, document, and backport fuzzing defines. 2020-09-14 13:36:10 +00:00
FuzzPathop.cpp Revert "Revert "switch to new filltype for SkPath"" 2019-11-26 17:43:14 +00:00
FuzzPolyUtils.cpp Move SkImageFilter functionality into private SkImageFilter_Base 2019-08-02 18:56:39 +00:00
FuzzRegionOp.cpp [fuzz] Expose Region Op fuzzing to oss-fuzz. 2021-03-29 16:05:05 +00:00
FuzzRRect.cpp add SkRRect::readFromMemory() fuzzer 2020-08-11 20:26:28 +00:00
FuzzSkParagraph.cpp [fuzzing] Paint SkParagraph. 2021-02-08 22:42:53 +00:00
FuzzTriangulation.cpp Add fuzzer for Triangulating Path Renderer 2021-04-22 15:35:29 +00:00
README.md [fuzz] Standardize, document, and backport fuzzing defines. 2020-09-14 13:36:10 +00:00

We fuzz Skia using oss-fuzz, which in turn uses fuzzing engines such as libfuzzer, afl-fuzz, hong-fuzz and others.

We define a fuzzer to be a targeted bit of code that takes a randomized input and executes code in a specific area. For example, we have a codec fuzzer which takes a mutated png/jpeg or similar file and attempts to turn it into an SkImage. We also have a canvas fuzzer which takes in a random set of bytes and turns them into calls on SkCanvas.

See [../site/dev/testing/fuzz.md] for more information on building and running fuzzers.

See also: