4c93a12688
Point them to their equivalent in https://skia.org. BUG=None R=hcm@google.com, jcgregorio@google.com NOTRY=true Review URL: https://codereview.chromium.org/856353004
124 lines
3.3 KiB
Lua
124 lines
3.3 KiB
Lua
Skia Update
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Skia : Access
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- https://skia.org
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- https://skia.googlesource.com/skia
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Skia : Overview
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- portable graphics engine
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- 2D transformations + perspective
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- primitives: text, geometry, images
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- effects: shaders, filters, antialiasing, blending
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Skia : Porting
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- C++ and some SIMD assembly
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- Fonts : CoreText, FreeType, GDI, DirectWrite
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- Threads : wrappers for native apis
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- Memory : wrappers for [new, malloc, discardable]
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Skia : Backends
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- Surface
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-- raster : ARGB, RGB16, A8 in software
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-- gpu : transcribe to OpenGL
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- Document
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-- transcribe to PDF or XPS
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- Record and Playback
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-- Picture
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-- Pipe
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Skia : Clients
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- Blink : under the GraphicsContext hood
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- Chrome : ui/gfx and compositor
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- Android : framework
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- third parties : e.g. Mozilla
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Skia In Blink
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Skia In Blink : Fonts
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- SkTypeface and SkFontMgr : platform agnostic
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- Runtime switch between GDI and DirectWrite
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- SkTextBlob to encapsulate runs of text
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- Push LCD decision-making out of Blink
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Skia In Blink : Record-Time-Rasterization
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- What? : direct rendering during “Paint” pass
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-- Image scaling, filters
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-- SVG patterns, masks
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- Problematic in modern Blink
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-- CTM not always known/knowable
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-- Rendering backend not always known (gpu or cpu)
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-- Rasterization takes (too much) time
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Skia In Blink : RTR response
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- SkImageFilter w/ CPU and GPU implementations
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- Bitmap scaling : bilerp, mipmaps, fancy
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- SkPicture for caching SVG
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- SkPicture + saveLayer() for masks
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-- PathOps for resolving complex paths
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- SkPictureShader for device-independent patterns
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Skia In Blink : Recording
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- GraphicsContext (now) backed by SkPicture
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-- draw commands are recorded for later playback
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-- all parameters must be copied or (safely) ref'd
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-- may record more than is currently visible
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- Resulting picture may be replayed multiple times
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-- from different thread(s)
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Skia In Blink : Recording response
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- New implementation
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- Optimized for recording speed
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-- shallow copies whenever possible
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-- rearchitect all Skia effects to be immutable
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- Reentrant-safe for playback in multiple threads
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-- also affected effect subclasses
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Skia In Blink : Playback
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- Separate pass for optimizations (optional)
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-- peep-holes rewrites
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-- compute bounding-box hierarchy for faster tiling
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-- can be done outside of Blink thread
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- GPU optimizations
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-- layer "hoisting"
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-- distance fields : fonts and concave paths
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Skia In Blink : multi-picture-draw
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- mpd(canvas[], picture[], matrix[], paint[])
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- Requires independent canvas objects
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-- all other parameters can be shared
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-- draw order is unspecified
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- Examples
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-- 1 picture drawing to multiple tiles (canvases)
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-- multiple pictures each drawing to its own layer
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Skia In Blink : MPD optimizations*
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- GPU
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-- "layer hoisting" to reduce rendertarget switching
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-- layer atlasing (also applies to imagefilters)
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-- pre-uploading of textures
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-- atlas yuv (from jpeg) to convert on gpu
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- CPU
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-- parallel execution using thread pool
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-- pre-decoding of images based on visibility
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Skia : Roadmap
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Skia : Roadmap - performance
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- GPU
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-- extended OpenGL features (e.g. geometry shaders)
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-- reordering for increased batching
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-- support for new low-level OpenGL APIs
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- CPU
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-- SIMD applied to floats
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-- smarter culling in pictures
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Skia : Roadmap - API
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- Cross process support
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- Direct support for sRGB
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- Robust file format
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- Support PDF viewing
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- Stable C ABI
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-- bindings for JS, Go, Python, Lua
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Demo
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