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safety measures in thumbnail code

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This commit is contained in:
Chris Lee 2019-03-03 01:40:12 +01:00
parent b6c19da36c
commit d682756012
1 changed files with 4 additions and 1 deletions
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5
src/util/window.c
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@ -379,6 +379,7 @@ void smooth_thumbnail(cairo_surface_t *image_surface)
u_int32_t b = (5 * (c1 & bmask) + 1 * (c2 & bmask) + 1 * (c3 & bmask) + 1 * (c4 & bmask)) / 8;
u_int32_t g = (5 * (c1 & gmask) + 1 * (c2 & gmask) + 1 * (c3 & gmask) + 1 * (c4 & gmask)) / 8;
u_int32_t r = (5 * (c1 & rmask) + 1 * (c2 & rmask) + 1 * (c3 & rmask) + 1 * (c4 & rmask)) / 8;
g_assert(i < tw * th);
data[i] = (r & rmask) | (g & gmask) | (b & bmask);
}
}
@ -445,7 +446,7 @@ cairo_surface_t *get_window_thumbnail_ximage(Window win, size_t size, gboolean u
goto err1;
}
shminfo.shmaddr = ximg->data = (char *)shmat(shminfo.shmid, 0, 0);
if (!shminfo.shmaddr) {
if (shminfo.shmaddr == (void*)-1) {
fprintf(stderr, RED "tint2: !shmat" RESET "\n");
goto err2;
}
@ -516,6 +517,7 @@ cairo_surface_t *get_window_thumbnail_ximage(Window win, size_t size, gboolean u
u_int32_t r = ((c1 & rmask) + (c2 & rmask) + (c3 & rmask) + (c4 & rmask) + (c5 & rmask) * 2 + (c6 & rmask) +
(c7 & rmask)) /
8;
g_assert(j < tw * th);
data[j] = (r & rmask) | (g & gmask) | (b & bmask);
}
}
@ -542,6 +544,7 @@ cairo_surface_t *get_window_thumbnail_ximage(Window win, size_t size, gboolean u
// 2nd pass
smooth_thumbnail(result);
cairo_surface_mark_dirty(result);
if (ximg) {
XDestroyImage(ximg);