28 lines
1.1 KiB
Markdown
28 lines
1.1 KiB
Markdown
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# SDL_Renderer Based Drawing Functions
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In LVGL, drawing was performed by CPU. To improve drawing performance on platforms with GPU,
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we should perform drawing operations on GPU if possible.
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This implementation has moved most bitmap blending and drawing procedures to utilize SDL_Renderer,
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which takes advantages of hardware acceleration APIs like DirectX or OpenGL.
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This implementation can be also considered as a reference implementation, for contributors wants to
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develop accelerated drawing functions with other APIs such as OpenGL/OpenGL ES.
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## Caveats
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`lv_draw_arc`, `lv_draw_line` is not enabled, due to incomplete implementation. So lines and arcs will
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have significant impact to drawing performances.
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Performance of this implementation still has room to improve. Or we should use more powerful APIs
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such as OpenGL.
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## Notices for files
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### `lv_draw_sdl_stack_blur.c`
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Contains modified code from [android-stackblur](https://github.com/kikoso/android-stackblur) project.
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Apache License 2.0
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### `lv_draw_sdl_lru.c`/`lv_draw_sdl_lru.h`
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Contains modified code from [C-LRU-Cache](https://github.com/willcannings/C-LRU-Cache) project. No license defined.
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