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render/pixel_format: import pixel_format_info_check_stride()

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We'll use this function from wlr_shm too.

Add some assertions, use int32_t (since the wire protocol uses that,
and we don't want to use 16-bit integers on exotic systems) and
switch the stride check to be overflow-safe.
This commit is contained in:
Simon Ser 2022-09-17 14:37:52 +02:00 • committed by Simon Zeni
parent 8cfd44980b
commit 6e88eeadeb
3 changed files with 23 additions and 17 deletions
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19
render/pixel_format.c
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@ -1,4 +1,6 @@
#include <assert.h>
#include <drm_fourcc.h>
#include <wlr/util/log.h>
#include "render/pixel_format.h"
static const struct wlr_pixel_format_info pixel_format_info[] = {
@ -176,3 +178,20 @@ enum wl_shm_format convert_drm_format_to_wl_shm(uint32_t fmt) {
return (enum wl_shm_format)fmt;
}
}
bool pixel_format_info_check_stride(const struct wlr_pixel_format_info *fmt,
int32_t stride, int32_t width) {
assert(fmt->bpp > 0 && fmt->bpp % 8 == 0);
int32_t bytes_per_pixel = (int32_t)(fmt->bpp / 8);
if (stride % bytes_per_pixel != 0) {
wlr_log(WLR_DEBUG, "Invalid stride %d (incompatible with %d "
"bytes-per-pixel)", stride, bytes_per_pixel);
return false;
}
if (stride / bytes_per_pixel < width) {
wlr_log(WLR_DEBUG, "Invalid stride %d (too small for %d "
"bytes-per-pixel and width %d)", stride, bytes_per_pixel, width);
return false;
}
return true;
}