byte sprite_bpp(const osspriteop_header *s)
{
/* bit 31 indicates the presence of a full alpha channel
* rather than a binary mask */
int type = ((unsigned)s->mode >> osspriteop_TYPE_SHIFT) & 15;
byte bpp = 0;
switch (type) {
case osspriteop_TYPE_OLD:
{
bits psr;
int val;
if (!xos_read_mode_variable(s->mode,
os_MODEVAR_LOG2_BPP, &val, &psr) &&
!(psr & _C))
bpp = 1 << val;
}
break;
case osspriteop_TYPE1BPP: bpp = 1; break;
case osspriteop_TYPE2BPP: bpp = 2; break;
case osspriteop_TYPE4BPP: bpp = 4; break;
case osspriteop_TYPE8BPP: bpp = 8; break;
case osspriteop_TYPE16BPP: bpp = 16; break;
case osspriteop_TYPE32BPP: bpp = 32; break;
case osspriteop_TYPE_CMYK: bpp = 32; break;
}
return bpp;
}
unsigned int ro_gui_dialog_test_sprite(const char *name) {
unsigned int result = 0;
int var_val;
os_coord dimensions;
os_mode mode;
os_error *error;
error = xosspriteop_read_sprite_info(osspriteop_USER_AREA,
theme_sprites, (osspriteop_id)name,
&dimensions.x, &dimensions.y, 0, &mode);
if (error) return 1;
if (((unsigned int)mode) & osspriteop_ALPHA_MASK) result |= 4;
error = xos_read_mode_variable(mode, os_MODEVAR_LOG2_BPP,
&var_val, 0);
if (error) {
LOG(("xos_read_mode_variable: 0x%x: %s",
error->errnum, error->errmess));
} else {
if (var_val > 3) result |= 2;
}
return result;
}
