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feat(ppa): add PPA FreeType font compositing example

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morris
2026-08-18 19:00:26 +08:00
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commit d3d0cbc594
18 changed files with 675 additions and 100 deletions
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examples/peripherals/ppa/ppa_transform/README.md
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## Overview
This example demonstrates how to use `esp_driver_ppa` to process an embedded RGB565 image without any display hardware.
This example demonstrates how to use `esp_driver_ppa` to transform and fill an embedded RGB565 image without any display hardware.
The example embeds a pre-generated raw RGB565 image, processes it with three PPA engines, then base64-encodes the final RGB565 buffer and prints it to the serial console. The accompanying pytest script reconstructs the image as a PPM file and compares it with a golden reference image.
The example embeds a pre-generated raw RGB565 image, processes it with two PPA engines, then base64-encodes the final RGB565 buffer and prints it to the serial console. The accompanying pytest script reconstructs the image as a PPM file and compares it with a golden reference image.
The processing pipeline demonstrates:
- SRM: rotate the full image by 180 degrees
- Blend: overlay a cyan A8-mask highlight using a fixed foreground color
- Fill: draw an amber frame and blue corner markers
## Hardware Required
@@ -35,7 +34,6 @@ I (1555) main_task: Calling app_main()
Loading embedded RGB565 image from flash...
Embedded raw image size: 153600 bytes
Transforming image with PPA SRM...
Blending highlight with PPA blend...
Drawing border with PPA fill...
IMAGE_META width=320 height=240 format=RGB565 encoding=base64
IMAGE_BASE64_BEGIN