[Scummvm-devel] Bitdepth/pixel format API concerns

[Sven Hesse]

My $0.02:

On 2009-06-08 14:38:55 -0700, J Northup wrote:
> * What happens when the engine requests an unsupported format?
>     * Does InitGraphics fall back to 8 bit, or fail entirely?
>     * How does the game engine learn that its request was denied?
>     * How does the game engine request an alternate format, if the game
> supports multiple formats: a second call to InitGraphics,
>         or a second method meant specifically for specifying bitdepth?

Or let the engine query an array of supported formats and InitGraphics
just fails (gracefully) for all unsupported ones?

>     * Should it be a generic format specifier (8, 555, 1555, 565, 888, 8888,
> etc)?

I'd be in favour of that one.

> [pixel format conversion:]
>     * Should the engine and backend developers have free choice among these
> optioins, so that they can choose the case  that makes
>       the most sense for their engine or backend?

I'd very much like that one.
At least for Gob, handling it manually is probably better.

About conversion in general: Basically, the dither code could be used for that.
It could use a default/constructed palette though, and maybe a way to use
static dithering instead of error distribution, for speed.
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