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render/pixel_format: import pixel_format_info_check_stride()
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.
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8cfd44980b
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3 changed files with 23 additions and 17 deletions
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@ -19,6 +19,8 @@ struct wlr_pixel_format_info {
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};
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const struct wlr_pixel_format_info *drm_get_pixel_format_info(uint32_t fmt);
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bool pixel_format_info_check_stride(const struct wlr_pixel_format_info *info,
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int32_t stride, int32_t width);
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uint32_t convert_wl_shm_format_to_drm(enum wl_shm_format fmt);
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enum wl_shm_format convert_drm_format_to_wl_shm(uint32_t fmt);
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@ -28,21 +28,6 @@ struct wlr_gles2_texture *gles2_get_texture(
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return (struct wlr_gles2_texture *)wlr_texture;
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}
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static bool check_stride(const struct wlr_pixel_format_info *fmt,
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uint32_t stride, uint32_t width) {
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if (stride % (fmt->bpp / 8) != 0) {
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wlr_log(WLR_ERROR, "Invalid stride %d (incompatible with %d "
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"bytes-per-pixel)", stride, fmt->bpp / 8);
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return false;
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}
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if (stride < width * (fmt->bpp / 8)) {
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wlr_log(WLR_ERROR, "Invalid stride %d (too small for %d "
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"bytes-per-pixel and width %d)", stride, fmt->bpp / 8, width);
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return false;
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}
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return true;
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}
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static bool gles2_texture_update_from_buffer(struct wlr_texture *wlr_texture,
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struct wlr_buffer *buffer, const pixman_region32_t *damage) {
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struct wlr_gles2_texture *texture = gles2_get_texture(wlr_texture);
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@ -72,7 +57,7 @@ static bool gles2_texture_update_from_buffer(struct wlr_texture *wlr_texture,
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drm_get_pixel_format_info(texture->drm_format);
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assert(drm_fmt);
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if (!check_stride(drm_fmt, stride, buffer->width)) {
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if (!pixel_format_info_check_stride(drm_fmt, stride, buffer->width)) {
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wlr_buffer_end_data_ptr_access(buffer);
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return false;
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}
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@ -212,7 +197,7 @@ static struct wlr_texture *gles2_texture_from_pixels(
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drm_get_pixel_format_info(drm_format);
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assert(drm_fmt);
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if (!check_stride(drm_fmt, stride, width)) {
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if (!pixel_format_info_check_stride(drm_fmt, stride, width)) {
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return NULL;
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}
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@ -1,4 +1,6 @@
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#include <assert.h>
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#include <drm_fourcc.h>
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#include <wlr/util/log.h>
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#include "render/pixel_format.h"
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static const struct wlr_pixel_format_info pixel_format_info[] = {
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@ -176,3 +178,20 @@ enum wl_shm_format convert_drm_format_to_wl_shm(uint32_t fmt) {
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return (enum wl_shm_format)fmt;
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}
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}
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bool pixel_format_info_check_stride(const struct wlr_pixel_format_info *fmt,
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int32_t stride, int32_t width) {
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assert(fmt->bpp > 0 && fmt->bpp % 8 == 0);
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int32_t bytes_per_pixel = (int32_t)(fmt->bpp / 8);
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if (stride % bytes_per_pixel != 0) {
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wlr_log(WLR_DEBUG, "Invalid stride %d (incompatible with %d "
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"bytes-per-pixel)", stride, bytes_per_pixel);
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return false;
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}
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if (stride / bytes_per_pixel < width) {
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wlr_log(WLR_DEBUG, "Invalid stride %d (too small for %d "
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"bytes-per-pixel and width %d)", stride, bytes_per_pixel, width);
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return false;
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}
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return true;
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}
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