ARGB1555 conversion
Mike Gran <[email protected]>
| Newsgroups | gmane.comp.lib.cairo |
|---|---|
| Message-ID | <[email protected]> |
Hi- I have a set of game art that was stored as 16-bit ARGB1555 format: 5 bits per RGB color plus 1 bit that is basically a color key bit to signal that the pixel is completely transparent. ARGB1555 is a format from both old DOS-era Targa files and from NintendoDS homebrew games. FWIW, these are 8x8 pixel tiles, and I'll end up blitting maybe 2000 of them per frame. To make it work, I paint each the tiles onto a CAIRO_FORMAT_ARGB32 image surface, and then just paint the entire image surface to the GTK window's surface. (Painting the tiles directly onto the GTK window surface was slower) I've been up-converting the 16-bit ARGB1555 to CAIRO_FORMAT_ARGB32, which is okay so far. Is that the best way? Can I somehow use ARGB1555 natively? If all I care about is 100% alpha and 0% alpha Should I instead be trying to use CAIRO_FORMAT_A1 + CAIRO_FORMAT_RGB16_565 somehow, since speed is my primary concern? Thanks, Mike -- cairo mailing list [email protected] http://lists.cairographics.org/mailman/listinfo/cairo