Miroirs/libliftoff
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/emersion/libliftoff.git synced 2025-01-18 10:27:00 +01:00
Code Issues Projects Releases Packages Wiki Activity

example/compositor: handle out-of-bounds coords when compositing

Browse source
This commit is contained in:
Simon Ser 2019-10-11 22:54:54 +03:00
parent aacbcf40b4
commit 927efe09d2
No known key found for this signature in database
GPG key ID: 0FDE7BE0E88F5E48
1 changed files with 17 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

22
example/compositor.c
View file

@ -65,16 +65,28 @@ static void composite(int drm_fd, struct dumb_fb *dst_fb, struct dumb_fb *src_fb
int dst_x, int dst_y)
{
uint8_t *dst, *src;
size_t y;
int i, y, src_width;
dst = dumb_fb_map(dst_fb, drm_fd);
src = dumb_fb_map(src_fb, drm_fd);
for (y = 0; y < src_fb->height; y++) {
memcpy(dst + dst_fb->stride * (dst_y + y) +
src_width = src_fb->width;
if (dst_x < 0) {
dst_x = 0;
}
if (dst_x + src_width > (int)dst_fb->width) {
src_width = dst_fb->width - dst_x;
}
for (i = 0; i < (int)src_fb->height; i++) {
y = dst_y + i;
if (y < 0 || y >= (int)dst_fb->height) {
continue;
}
memcpy(dst + dst_fb->stride * y +
dst_x * sizeof(uint32_t),
src + src_fb->stride * y,
src_fb->width * sizeof(uint32_t));
src + src_fb->stride * i,
src_width * sizeof(uint32_t));
}
munmap(dst, dst_fb->size);