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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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2
include/render/pixel_format.h
View file

@ -19,6 +19,8 @@ struct wlr_pixel_format_info {
}; };
const struct wlr_pixel_format_info *drm_get_pixel_format_info(uint32_t fmt); const struct wlr_pixel_format_info *drm_get_pixel_format_info(uint32_t fmt);
bool pixel_format_info_check_stride(const struct wlr_pixel_format_info *info,
int32_t stride, int32_t width);
uint32_t convert_wl_shm_format_to_drm(enum wl_shm_format fmt); uint32_t convert_wl_shm_format_to_drm(enum wl_shm_format fmt);
enum wl_shm_format convert_drm_format_to_wl_shm(uint32_t fmt); enum wl_shm_format convert_drm_format_to_wl_shm(uint32_t fmt);

19
render/gles2/texture.c
View file

@ -28,21 +28,6 @@ struct wlr_gles2_texture *gles2_get_texture(
return (struct wlr_gles2_texture *)wlr_texture; return (struct wlr_gles2_texture *)wlr_texture;
} }
static bool check_stride(const struct wlr_pixel_format_info *fmt,
uint32_t stride, uint32_t width) {
if (stride % (fmt->bpp / 8) != 0) {
wlr_log(WLR_ERROR, "Invalid stride %d (incompatible with %d "
"bytes-per-pixel)", stride, fmt->bpp / 8);
return false;
}
if (stride < width * (fmt->bpp / 8)) {
wlr_log(WLR_ERROR, "Invalid stride %d (too small for %d "
"bytes-per-pixel and width %d)", stride, fmt->bpp / 8, width);
return false;
}
return true;
}
static bool gles2_texture_update_from_buffer(struct wlr_texture *wlr_texture, static bool gles2_texture_update_from_buffer(struct wlr_texture *wlr_texture,
struct wlr_buffer *buffer, const pixman_region32_t *damage) { struct wlr_buffer *buffer, const pixman_region32_t *damage) {
struct wlr_gles2_texture *texture = gles2_get_texture(wlr_texture); struct wlr_gles2_texture *texture = gles2_get_texture(wlr_texture);
@ -72,7 +57,7 @@ static bool gles2_texture_update_from_buffer(struct wlr_texture *wlr_texture,
drm_get_pixel_format_info(texture->drm_format); drm_get_pixel_format_info(texture->drm_format);
assert(drm_fmt); assert(drm_fmt);
if (!check_stride(drm_fmt, stride, buffer->width)) { if (!pixel_format_info_check_stride(drm_fmt, stride, buffer->width)) {
wlr_buffer_end_data_ptr_access(buffer); wlr_buffer_end_data_ptr_access(buffer);
return false; return false;
} }
@ -212,7 +197,7 @@ static struct wlr_texture *gles2_texture_from_pixels(
drm_get_pixel_format_info(drm_format); drm_get_pixel_format_info(drm_format);
assert(drm_fmt); assert(drm_fmt);
if (!check_stride(drm_fmt, stride, width)) { if (!pixel_format_info_check_stride(drm_fmt, stride, width)) {
return NULL; return NULL;
} }

19
render/pixel_format.c
View file

@ -1,4 +1,6 @@
#include <assert.h>
#include <drm_fourcc.h> #include <drm_fourcc.h>
#include <wlr/util/log.h>
#include "render/pixel_format.h" #include "render/pixel_format.h"
static const struct wlr_pixel_format_info pixel_format_info[] = { 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; 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;
}