2. CanvasGLis a GPU-accelerated WebKit
that fully accelerates:
CSS3 Animation HTML5 2D Canvas
(Accelerated Composition) (Accelerated 2D Canvas)
3. (1) Accelerated Composition:
• Reduces unnecessary works
It does not repaint the unchanged layers.
It composites layers with the GPU.
• Uses Texture Mapper Method
It removes complicated abstraction layers.
It uses OpenGL ES 2.0 directly.
•3 ~ 10 times faster than Android default
Browser on CSS Animations
4. (2) Accelerated 2D Canvas:
• Smart Batching System
It maximizes the GPU and minimizes the CPU.
It minimizes draw call batch.
• Uses Texture Atlas to remove state changes
• Fully accelerates HTML5 2D Canvas
Shadow
Composite operations
Vector graphics APIs
•Dramatically reduces CPU overhaed
5. What CanvasGLdoes
JavaScript
(Canvas) CanvasGL OpenGL ES CPU GPU
Draw Call
Draw Call
Draw Call
Computing
Draw Call Draw Call Flush
Context
Draw Call
6. What others do (Skia-GPU, Google chrome)
JavaScript
(Canvas) OpenGL ES CPU GPU
Computing
Draw Call Draw Call Context
Computing
Draw Call Draw Call Context
Computing
Draw Call Draw Call Context
Computing Flush
Draw Call Draw Call Context
Computing
Draw Call Draw Call Context
7. SKIA-GPU:
• 2D Graphics Back-end for Chrome Android
• Problems
calls glDrawSomethings too many times
changes gl states too many times
switches FBO too many times
vector graphics APIs and shadows are really slow
•Increases dramatically CPU overhead
8. Maximizes GPU usage
CanvasGL QuartzGL* Direct2D** SKIA
Draw Call At Once
(Company 100) (Apple) (Microsoft) (Google)
Bitmap Sprite Good Good Good Good
Convex Path Good Good Poor Poor
Concave Path Good Poor Poor Poor
Bitmap Sprite + Path Good Good Good Poor
Path + Different Brush Type Average Poor Poor Poor
Path + Different Shadow Good Poor Poor Poor
Text + Different Draw Call Good Poor Poor Poor
Minimizes CPU usage
CanvasGL QuartzGL Direct2D SKIA
CPU Tessellation No No Yes Yes
GL State Optimization Good Average Average Poor
* ** QuartzGL and Direct2D are proprietary software without source codes.
The results are approximations based on experiments and articles.
13. For more information
• Developers blog
http://dev.dorothybrowser.com/
• Company 100
http://www.company100.net/
Editor's Notes
Good morning.I’m Gwangyoon from Company 100.Today we’re going to see CanvasGL,A true GPU-Accelerated WebKit for Android.
We have fully accelerated the GPU in two areas: HTML5 2D Canvas and CSS3 animation. We mean FULLY.
Then if we have a thousand draw calls, the CPU cost will be a Thousand times higher. And this makes the GPU acceleration to be CPU bounded.This makes the GPU Accelerated 2D Canvas extremely slow.
Then if we have a thousand draw calls, the CPU cost will be a Thousand times higher. And this makes the GPU acceleration to be CPU bounded.This makes the GPU Accelerated 2D Canvas extremely slow.
