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README
1. Default Examples
1.1 Alpha-blending
PROJECT: alpha-blending
It is an ALL-IN-ONE example that demonstrates almost all the features provided by the library. It is also used as a benchmark of Arm-2D. Since there is no public benchmark available for micro-controllers, we decide to overcome this problem with the following methods and considerations:
- Choose the widely used algorithms in embedded GUI as the body of the benchmark
- Alpha-blending
- Image Copy
- Texture Paving
- Simulate a typical application scenario with sufficient complexity
- Background with Texture paving (switching different mirroring modes every 4 second)
- Foreground picture
- Two constructed layers for alpha-blending and texture paving
- Moving icons
- Spinning busy wheel
- Choose a typical low-cost LCD resolution 320*240 in RGB565
- Let those layers float with different angles and speed to cover a sufficient number of conditions.
- Record the cycle count used for blending one frame and run 1000 iterations (frames).
Figure 1-1 A snapshot of alpha-blending demos running on MPS3 platform
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Use the average cycle count in 1000 iterations as benchmark score.
- Based on that, for typical embedded application requirement, we derive a more meaningful metrics called the Minimal Frequency Required for 30 FPS (MHz) as shown in Figure 1-5.
Figure 1-2 Performance Comparison among some Cortex-M processors
1.2 Partial-Frame-Buffer
PROJECT: partial_frame_buffer
The visual effects is the same as Alpha-blending but using Partial-Frame-buffer scheme.
1.3 Watch-Panel
PROJECT: watch_panel
It is an example of rotation APIs. It consists of five layers:
- A floating background layer (Using Tile Copy)
- A clock_panel layer (Using Alpha-Blending-With-Colour-Masking)
- A small gold gear (Rotation)
- A big black gear (Rotation with Alpha Blending)
- A red pointer (Rotation)
This demo also shows how a fancy looking clock could be rendered with just less than 10K RAM (or even less by using a smaller PFB size).
