update slide content

resources/slides_content2.lua

 Skia Update
 
 Skia : Overview
 - portable 2D graphics engine
-- src: geometry, images, text
-- dst : raster, gpu, pdf, displaylist, *user-defined
-- attr: shaders, filters, antialiasing, blending, *user-defined
+- src : geometry, images, text
+- attr: shaders, filters, antialiasing, blending
+- dst : raster, gpu, pdf, picture
+
+Skia : Porting
+- C++ and some SIMD assembly
+- Fonts : CoreText, FreeType, GDI, DirectWrite
+- Threads : wrappers for native apis
+- Memory : wrappers for [new, malloc, discardable]
 
 Skia : Clients
-- Blink : direct and via GraphicsContext
+- Blink : under the GraphicsContext hood
 - Chrome : ui/gfx and compositor
 - Android framework
 - third parties : e.g. Mozilla
-- code.google.com/p/skia
+- sites.google.com/site/skiadocs
 
-Skia : Porting
-- C++ and some SIMD assembly
-- Fonts : CoreText, FreeType, GDI, DirectWrite, *user-define
-- Threads : wrappers for native apis
-- Memory : wrappers for [new, malloc, discardable]
-
-Skia : API
-- SkCanvas
--- save, saveLayer, restore
--- translate, scale, rotate, concat
--- clipRect, clipPath
-- SkPaint
--- color, stroking, antialiasing, filtering
--- typeface, textSize, text-flags
--- effects: shader, color-filter, image-filter, mask-filter, xfermode
-
-<blockstyle = code>
-void onDraw(SkCanvas* canvas) {
-    SkPaint paint;
-    paint.setFoo(...);
-    canvas->drawRect(..., paint);
-    paint.setBar(...);
-    canvas->drawOval(..., paint);
-}
-
-<blockstyle = code>
-void onDraw(SkCanvas* canvas) {
-    canvas->drawRect(..., fPaint0);
-    canvas->drawOval(..., fPaint1);
-}
-
-Skia In Blink : GraphicsContext
-- Similar
--- rects, paths, images, text
--- matrices, clips
-- Different
--- save/restore affect matrix+clip PLUS all paint settings
--- both fill and stroke settings are specified
--- hence: fillRect(), strokeRect(), drawRect()
-
-<blockstyle = code>
-void onDraw(GraphicsContext* gc) {
-    gc->save();
-    gc->setFoo(...);
-    gc->fillRect(...);
-    gc->setBar(...);
-    gc->fillOval(...);
-    gc->restore();
-}
-
-Skia In Blink : more than GraphicsContext
-- Simple wrappers
--- FloatRect -- SkRect
--- Path -- SkPath
-- Font.h + 21 others
--- SkTypeface + flags
-- Image.h + 25 others
--- SkBitmap, SkImage
+Skia In Blink
 
 Skia In Blink : Fonts
-- Assist with code-sharing between platforms
+- SkTypeface and SkFontMgr : platform agnostic
 - Runtime switch between GDI and DirectWrite
-- Add SkFontMgr for selection
+- SkTextBlob to encapsulate runs of text
 - Push LCD decision-making out of Blink
 
 Skia In Blink : Record-Time-Rasterization
 - 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
-- SkPaint::FilterLevel : none, low, medium (mipmaps), high
+- FilterLevel : none, low, medium (mipmaps), high
 - 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
+-- 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
+
+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
+
+Skia : Roadmap
+
+Skia In Blink : Roadmap
+- GPU performance
+-- extended OpenGL features (e.g. geometry shaders)
+-- reordering for increased batching
+-- support for new low-level OpenGL APIs
+- Cross process support
+-- immediate mode ala SkGPipe
+-- serialize pictures
+
+Skia API Roadmap
+- Direct support for sRGB
+- Stable C API / ABI
+-- bindings for JS, Go, Python, Lua
+- Robust file format
+
+Demo
+