ASTC Direct from Flash

[Ed-Tronics]

Hi Rudolph,

I've been working with displaying ASTC images direct from flash using:

EVE_cmd_setbitmap_burst(FLASH_BITMAP_ADDR(BMP_IMG_ADDR), EVE_ASTC_4X4, 568U, 196U);
EVE_cmd_dl_burst(DL_BEGIN | EVE_BITMAPS);
EVE_cmd_dl_burst(VERTEX2F(650, 20));
EVE_cmd_dl_burst(DL_END);

This works great for monochrome images (with alpha), but as soon as I try to load anything containing colour I get solid blocks of black where I expect the image detail. The shape is maintained (since it also contains alpha), but it's filled in with black. In EAB 2.12.2 I'm using ASTC_4x4, "thorough" preset, with multi-cell disabled.

Any ideas? I'm preferring not to load into RAM_G if possible, it saves the headache of partitioning everything.

Cheers.

[RudolphRiedel]

Hi,

that should be working, yes, the last issue I had was with transparency when converting, with the images before converting.
Have you set color-rgb to white? EVE_color_rgb(WHITE); ?

Loading from RAM_G or Flash also should make no difference, within the limits of the bandwidth of the external flash though.

I did this a few years ago: https://github.com/RudolphRiedel/EVE_ASTC_Test_Arduino_PlatformIO
The goal was to check how big the impact is of different levels of compression.

[Ed-Tronics]

Have you set color-rgb to white? EVE_color_rgb(WHITE); ?

Ahah! Yes, that works. Thanks :) I totally missed this requirement. For anyone else who might read this:

Programming Guide Section 2.10.6 – Color and Transparency

The COLOR_RGB setting acts as a multiplier for the bitmap color. To render the bitmap as-is, set COLOR_RGB to white (255,255,255).

[RudolphRiedel]

This is nice when you use icons like from Googles material icon library, make them white in the file and you can display them in whatever color you need to.