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71 lines
2.3 KiB
Markdown
71 lines
2.3 KiB
Markdown
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# README
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## 1. Default Examples
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### 1.1 Alpha-blending
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**PROJECT: alpha-blending**
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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:
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- **Choose the widely used algorithms in embedded GUI as the body of the benchmark**
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- Alpha-blending
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- Image Copy
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- Texture Paving
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- **Simulate a typical application scenario with sufficient complexity**
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- Background with Texture paving (switching different mirroring modes every 4 second)
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- Foreground picture
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- Two constructed layers for alpha-blending and texture paving
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- Moving icons
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- Spinning busy wheel
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- **Choose a typical low-cost LCD resolution 320*240 in RGB565**
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- **Let those layers float with different angles and speed to cover a sufficient number of conditions.**
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- **Record the cycle count used for blending one frame and run 1000 iterations (frames).**
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**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.**
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- 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**.
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**Figure 1-2 Performance Comparison among some Cortex-M processors**
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### 1.2 Partial-Frame-Buffer
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**PROJECT: partial_frame_buffer**
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The visual effects is the same as Alpha-blending but using Partial-Frame-buffer scheme.
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### 1.3 Watch-Panel
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**PROJECT: watch_panel**
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It is an example of rotation APIs. It consists of five layers:
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1. A floating background layer (Using Tile Copy)
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2. A clock_panel layer (Using Alpha-Blending-With-Colour-Masking)
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3. A small gold gear (Rotation)
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4. A big black gear (Rotation with Alpha Blending)
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5. A red pointer (Rotation)
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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).
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