Mike Klein 5c612ade3b create a sample to demonstrate a timing attack ... This sample attempts to re-create an image's alpha channel by drawing it one pixel at a time and timing how long each pixel takes to draw. The "abc" text should appear twice normally, and the third and fourth versions are reconstructed from timing, one by timing 1:1 pixel draws, the other by timing 1x1:1024x1024 upscale into an offscreen. It's not meant to be an exact reconstruction, but you can easily see the shapes, particularly at -O0, -O1, and -Os. Auto-vectorization from -O2/-O3 do a good amount to cover up the problem. The legacy CPU backend is the main place to look. I haven't been able to reconstruct any images using SkRasterPipelineBlitter or SkVMBlitter, and while on the GPU I do see non-random patterns in the timing, it appears to be the same single pattern across devices, OSes, GPUs, GPU APIs and content... I assume it's something like our resource caching policy. This can't really be a GM, given how it draws non-deterministically. Bug: chromium:1088224 Change-Id: I2ec79c8dd407ecb104fd9bf0c8039cb6dd1fe436 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/313466 Commit-Queue: Mike Klein <mtklein@google.com> Commit-Queue: Mike Reed <reed@google.com> Reviewed-by: Mike Reed <reed@google.com>		2020-08-28 16:17:39 +00:00
..
DecodeFile.h
PerlinPatch.cpp	Remove SkTMin and SkTMax	2020-02-07 18:40:09 +00:00
Sample2PtRadial.cpp	Fix clang 12 Wsuggest-override and Wsuggest-destructor-override	2020-07-22 01:11:36 +00:00
Sample3D.cpp	SkRuntimeEffect SkSL has a new signature for main()	2020-08-25 13:36:28 +00:00
Sample.cpp	Remove SkCanvas::getGrContext calls from samplecode	2020-07-09 18:37:02 +00:00
Sample.h	add std::function option to Click to simplify callsites	2020-04-22 15:41:28 +00:00
SampleAAClip.cpp
SampleAAGeometry.cpp	Enable ClangTidy flag modernize-use-override.	2020-08-14 10:54:45 +00:00
SampleAARectModes.cpp
SampleAARects.cpp
SampleAndroidShadows.cpp	Remove SkTMin and SkTMax	2020-02-07 18:40:09 +00:00
SampleAnimatedImage.cpp	Fix implicit fallthroughs throughout Skia.	2020-06-11 22:29:53 +00:00
SampleAnimatedText.cpp	Remove SkCanvas::getGrContext calls from samplecode	2020-07-09 18:37:02 +00:00
SampleAnimBlur.cpp
SampleArc.cpp
SampleAtlas.cpp
SampleAudio.cpp	Componentize SkAudioPlayer	2020-08-14 13:46:06 +00:00
SampleBackdropBounds.cpp	Revert "Revert "move onto new factories for SkMatrix""	2020-05-21 16:58:39 +00:00
SampleBitmapRect.cpp
SampleCamera.cpp
SampleCCPRGeometry.cpp	Write GPU buffers directly from GrStrokeGeometry	2020-07-24 04:38:51 +00:00
SampleChart.cpp	Switch over to SkPathBuilder	2020-07-31 02:21:51 +00:00
SampleChineseFling.cpp	Remove SkCanvas::getGrContext calls from samplecode	2020-07-09 18:37:02 +00:00
SampleCircle.cpp
SampleClip.cpp	SkPathView for ownerless (can live on stack) SkPaths	2020-08-07 20:39:38 +00:00
SampleClipDrawMatch.cpp
SampleClock.cpp	Revert "Reland "Revert "Use flat version of path-direction enum"""	2019-11-22 19:09:54 +00:00
SampleColorFilter.cpp
SampleComplexClip.cpp	Update complex clip GMs to only use supported clip ops	2020-06-25 14:15:25 +00:00
SampleCowboy.cpp	Revert "Revert "move onto new factories for SkMatrix""	2020-05-21 16:58:39 +00:00
SampleCusp.cpp
SampleDegenerateQuads.cpp	Rename domain types and vars to subset.	2020-04-21 21:43:45 +00:00
SampleDegenerateTwoPtRadials.cpp
SampleEffects.cpp	Fix clang 12 Wsuggest-override and Wsuggest-destructor-override	2020-07-22 01:11:36 +00:00
SampleEmboss.cpp	Fix clang 12 Wsuggest-override and Wsuggest-destructor-override	2020-07-22 01:11:36 +00:00
SampleFatBits.cpp	Revert "Revert "move onto new factories for SkMatrix""	2020-05-21 16:58:39 +00:00
SampleFillType.cpp	Fix clang 12 Wsuggest-override and Wsuggest-destructor-override	2020-07-22 01:11:36 +00:00
SampleFilter2.cpp
SampleFilterQuality.cpp	Revert "Revert "switch to new filltype for SkPath""	2019-11-26 17:43:14 +00:00
SampleFitCubicToCircle.cpp	Add an interactive sample that fits cubics to circular arcs	2020-06-09 23:04:03 +00:00
SampleFlutterAnimate.cpp	Remove SkCanvas::getGrContext calls from samplecode	2020-07-09 18:37:02 +00:00
SampleFontCache.cpp
SampleGlyphTransform.cpp
SampleGradients.cpp
SampleHairCurves.cpp
SampleHairline.cpp
SampleHairModes.cpp
SampleHT.cpp
SampleIdentityScale.cpp	SkBlurMaskFilter.h is only needed for (deprecated) emboss	2019-12-30 15:40:46 +00:00
SampleImageFilterDAG.cpp	Remove SkMaxScalar and SkMinScalar	2020-02-06 15:43:22 +00:00
SampleLayerMask.cpp	Fix clang 12 Wsuggest-override and Wsuggest-destructor-override	2020-07-22 01:11:36 +00:00
SampleLayers.cpp	hide savelayer's clipmask fields	2020-05-31 14:06:42 +00:00
SampleLCD.cpp
SampleLua.cpp	Enable ClangTidy flag modernize-use-override.	2020-08-14 10:54:45 +00:00
SampleManyRects.cpp
SampleMegaStroke.cpp
SampleMixer.cpp	Enable ClangTidy flag modernize-use-override.	2020-08-14 10:54:45 +00:00
SamplePatch.cpp	SkVertices: Remove volatile/nonvolatile bit	2020-03-11 17:33:17 +00:00
SamplePath.cpp	show fat stroking on lines or curves	2020-06-26 19:13:00 +00:00
SamplePathClip.cpp	add std::function option to Click to simplify callsites	2020-04-22 15:41:28 +00:00
SamplePathEffects.cpp
SamplePathOverstroke.cpp
SamplePathText.cpp	Merge PathText samples into one, with different modes	2020-05-29 16:35:25 +00:00
SamplePolyToPoly.cpp	Fix clang 12 Wsuggest-override and Wsuggest-destructor-override	2020-07-22 01:11:36 +00:00
SampleQuadStroker.cpp	Enable ClangTidy flag modernize-use-override.	2020-08-14 10:54:45 +00:00
SampleRectanizer.cpp	Reland GrRectanizerPow2	2020-05-19 18:35:13 +00:00
SampleRegion.cpp	Enable ClangTidy flag modernize-use-override.	2020-08-14 10:54:45 +00:00
SampleRepeatTile.cpp
SampleSG.cpp	[skottie] Cleanup: relocate Animator base class out of SkSG	2020-03-26 20:50:10 +00:00
SampleShaders.cpp
SampleShadowColor.cpp	Remove SkTMin and SkTMax	2020-02-07 18:40:09 +00:00
SampleShadowReference.cpp
SampleShadowUtils.cpp	Remove SkTMin and SkTMax	2020-02-07 18:40:09 +00:00
SampleShip.cpp
SampleSimpleStroker.cpp	Show mirror drawn with SkStroke (toy stroker)	2020-07-22 18:49:20 +00:00
SampleSlides.cpp	Remove unnecessary SK_SIZE_T_SPECIFIER macro.	2020-05-05 13:25:28 +00:00
SampleStringArt.cpp	Remove SkMaxScalar and SkMinScalar	2020-02-06 15:43:22 +00:00
SampleStrokePath.cpp	Revert "Revert "switch to new filltype for SkPath""	2019-11-26 17:43:14 +00:00
SampleStrokeRect.cpp	Fix clang 12 Wsuggest-override and Wsuggest-destructor-override	2020-07-22 01:11:36 +00:00
SampleSubpixelTranslate.cpp	SkBlurMaskFilter.h is only needed for (deprecated) emboss	2019-12-30 15:40:46 +00:00
SampleSVGFile.cpp
SampleTessellatedWedge.cpp	Rename GrTessellateStroke* -> GrStrokeTessellate* and friends	2020-07-31 02:24:05 +00:00
SampleTextBox.cpp	Regularize SkFontMgr for CoreText build.	2020-06-04 16:45:09 +00:00
SampleTextEffects.cpp	Enable ClangTidy flag modernize-use-override.	2020-08-14 10:54:45 +00:00
SampleTextureUpload.cpp	Remove SkCanvas::getGrContext calls from samplecode	2020-07-09 18:37:02 +00:00
SampleThinAA.cpp	Enable ClangTidy check llvm-namespace-comment.	2020-08-06 19:07:52 +00:00
SampleTiming.cpp	create a sample to demonstrate a timing attack	2020-08-28 16:17:39 +00:00
SampleUnpremul.cpp
SampleVertices.cpp
SampleWritePixels.cpp	Fix clang 12 Wsuggest-override and Wsuggest-destructor-override	2020-07-22 01:11:36 +00:00
SampleXfer.cpp	demo CubicResampler	2020-07-24 20:13:34 +00:00
SampleXfermodesBlur.cpp	Fix clang 12 Wsuggest-override and Wsuggest-destructor-override	2020-07-22 01:11:36 +00:00
vertexdump.cpp