From View to Pixel
summary
Explains how view objects become pixels: CPU builds a display list, the GPU renders polygons, and double buffering plus 16 milliseconds per frame and vsync decide smoothness; details include display list uploaded to OpenGL ES, when input and animations run before measure/layout, and invalidate versus requestLayout semantics. Shows practical knobs — use ViewTreeObserver to observe layout, flatten hierarchies or try constraint layout, detect costs with Android device monitor and GPU profiling, and spot wasted work with the overdraw debug visualization and Playstore vitals.
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chapters (24)
- 0:00Introduction
- 1:45About Britt
- 3:05Rasterization
- 4:37Display
- 7:45Execution
- 9:49Buffers
- 11:10Vsync
- 12:12Widgets
- 14:00Process
- 14:27Invalidation
- 16:30Frame
- 17:42Measure
- 20:13Size
- 21:54View Tree Observer
- 22:25Listeners
- 23:43Related Layout
- 24:19Layout Double Taxation
- 25:13Flatten your hierarchy
- 27:31View hierarchy tool
- 28:14No winners
- 28:53Constraint Layout
- 30:44Draw Problems
- 32:27Overdraw Debug
- 35:13Outro
