update slides

resources/slides_content2.lua

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