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wayland/surface: Intersect buffer damage with buffer rect

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Before processing the buffer damage region, intersect it with the buffer
rectangle to avoid trying to damage content outside the surface.

This fixes the runtime warning "GL error (1281): Invalid value"
happening when a client posts too large buffer damage larger.
This commit is contained in:
Jonas Ådahl 2018-12-03 17:02:30 +01:00 committed by Georges Basile Stavracas Neto
parent 7226c5c7bf
commit da5a2d3cb8
1 changed files with 9 additions and 2 deletions
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11
src/wayland/meta-wayland-surface.c
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@ -291,6 +291,7 @@ surface_process_damage (MetaWaylandSurface *surface,
{
MetaWaylandBuffer *buffer = meta_wayland_surface_get_buffer (surface);
cairo_rectangle_int_t surface_rect;
cairo_rectangle_int_t buffer_rect;
cairo_region_t *scaled_region;
cairo_region_t *transformed_region;
int i, n_rectangles;
@ -302,6 +303,12 @@ surface_process_damage (MetaWaylandSurface *surface,
if (!buffer)
return;
buffer_rect = (cairo_rectangle_int_t) {
.width = get_buffer_width (surface),
.height = get_buffer_height (surface),
};
cairo_region_intersect_rectangle (buffer_region, &buffer_rect);
/* Intersect the damage region with the surface region before scaling in
* order to avoid integer overflow when scaling a damage region is too large
* (for example INT32_MAX which mesa passes). */
@ -316,8 +323,8 @@ surface_process_damage (MetaWaylandSurface *surface,
scaled_region = meta_region_scale (surface_region, surface->scale);
transformed_region = meta_region_transform (scaled_region,
surface->buffer_transform,
get_buffer_width (surface),
get_buffer_height (surface));
buffer_rect.width,
buffer_rect.height);
/* Now add the buffer damage on top of the scaled damage region, as buffer
* damage is already in that scale. */