Can I display colours with alpha channel in dynamic bitmap?

Forum|Forum|5 years ago
November 30, 2020
4 replies
1454 views

Here: https://support.touchgfx.com/docs/development/ui-development/touchgfx-engine-features/dynamic-bitmaps I can see how to set RGB 565 colours into a dynamic bitmap. I'm wondering how to achieve alpha blending in a dynamic bitmap?

TouchGFX

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Best answer by Martin KJELDSEN

The application does not need to be 32-bit. TouchGFX knows how to blend ARGB8888 into an RGB565 framebuffer.

Martin KJELDSEN

Principal III

Dynamic Bitmaps support multiple color formats including ARGB8888. There's your alpha. TouchGFX will handle the blending from there.

/Martin

AndrewMAuthor

Associate III

Thanks Martin, so just to clarify, instead of having an RGB565 dynamic bitmap (as I currently have), and setting a colour within the bitmap using a 16 bit number and then having to calculate any alpha blending manually myself (which I was about to start figuring out), I would instead just use an ARGB8888 dynamic bitmap and set a colour/alpha within it using a 32 bit number, nothing more to do - correct?

Martin KJELDSENBest answer

Principal III

The application does not need to be 32-bit. TouchGFX knows how to blend ARGB8888 into an RGB565 framebuffer.

Alexandre RENOUX

Visitor II

Hello AndrewM,

When your question is answered, please close this topic by choosing Select as Best.

/Alexandre

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