Commit 55bcb93f authored by Daniel Stone's avatar Daniel Stone
Browse files

gl-renderer: Use helper for conversion to EGL rects

eglSwapBuffersWithDamage has to convert a damage region from Weston's
global co-ordinate space, into the co-ordinate space for EGL rendering
into a buffer for that output.

The conversion from the global co-ordinate space in logical pixels to
the output space in buffer pixels is slightly long and error-prone,
involving translating by the output's offset within the global
co-ordinate space, multiplying by output scale, and also translating to
allow for any borders we paint around the output.

After this is done, we need to flip the co-ordinates in the Y axis to
account for the lower-left-origin co-ordinate space used by EGL.

Since we want to reuse this for partial_update, but using a different
source region, extract this conversion into a well-commented helper we
can reuse.
Signed-off-by: Daniel Stone's avatarDaniel Stone <>
parent a7722ee9
......@@ -1352,6 +1352,71 @@ output_rotate_damage(struct weston_output *output,
go->border_damage[go->buffer_damage_index] = border_status;
* Given a region in Weston's (top-left-origin) global co-ordinate space,
* translate it to the co-ordinate space used by GL for our output
* rendering. This requires shifting it into output co-ordinate space:
* translating for output offset within the global co-ordinate space,
* multiplying by output scale to get buffer rather than logical size.
* Finally, if borders are drawn around the output, we translate the area
* to account for the border region around the outside, and add any
* damage if the borders have been redrawn.
* @param output The output whose co-ordinate space we are after
* @param global_region The affected region in global co-ordinate space
* @param[out] rects Y-inverted quads in {x,y,w,h} order; caller must free
* @param[out] nrects Number of quads (4x number of co-ordinates)
static void
pixman_region_to_egl_y_invert(struct weston_output *output,
struct pixman_region32 *global_region,
EGLint **rects,
EGLint *nrects)
struct gl_output_state *go = get_output_state(output);
pixman_region32_t transformed;
struct pixman_box32 *box;
int buffer_height;
EGLint *d;
int i;
/* Translate from global to output co-ordinate space. */
weston_transformed_region(output->width, output->height,
global_region, &transformed);
/* If we have borders drawn around the output, shift our output damage
* to account for borders being drawn around the outside, adding any
* damage resulting from borders being redrawn. */
if (output_has_borders(output)) {
output_get_border_damage(output, go->border_status,
/* Convert from a Pixman region into {x,y,w,h} quads, flipping in the
* Y axis to account for GL's lower-left-origin co-ordinate space. */
box = pixman_region32_rectangles(&transformed, nrects);
*rects = malloc(*nrects * 4 * sizeof(EGLint));
buffer_height = go->borders[GL_RENDERER_BORDER_TOP].height +
output->current_mode->height +
d = *rects;
for (i = 0; i < *nrects; ++i) {
*d++ = box[i].x1;
*d++ = buffer_height - box[i].y2;
*d++ = box[i].x2 - box[i].x1;
*d++ = box[i].y2 - box[i].y1;
/* NOTE: We now allow falling back to ARGB gl visuals when XRGB is
* unavailable, so we're assuming the background has no transparency
* and that everything with a blend, like drop shadows, will have something
......@@ -1369,9 +1434,6 @@ gl_renderer_repaint_output(struct weston_output *output,
struct gl_renderer *gr = get_renderer(compositor);
EGLBoolean ret;
static int errored;
int i, nrects, buffer_height;
EGLint *egl_damage, *d;
pixman_box32_t *rects;
pixman_region32_t buffer_damage, total_damage;
enum gl_border_status border_damage = BORDER_STATUS_CLEAN;
struct weston_view *view;
......@@ -1448,39 +1510,18 @@ gl_renderer_repaint_output(struct weston_output *output,
go->end_render_sync = create_render_sync(gr);
if (gr->swap_buffers_with_damage && !gr->fan_debug) {
weston_transformed_region(output->width, output->height,
output_damage, &buffer_damage);
if (output_has_borders(output)) {
output_get_border_damage(output, go->border_status,
rects = pixman_region32_rectangles(&buffer_damage, &nrects);
egl_damage = malloc(nrects * 4 * sizeof(EGLint));
buffer_height = go->borders[GL_RENDERER_BORDER_TOP].height +
output->current_mode->height +
d = egl_damage;
for (i = 0; i < nrects; ++i) {
*d++ = rects[i].x1;
*d++ = buffer_height - rects[i].y2;
*d++ = rects[i].x2 - rects[i].x1;
*d++ = rects[i].y2 - rects[i].y1;
int n_egl_rects;
EGLint *egl_rects;
/* For swap_buffers_with_damage, we need to pass the region
* which has changed since the previous SwapBuffers on this
* surface - this is output_damage. */
pixman_region_to_egl_y_invert(output, output_damage,
&egl_rects, &n_egl_rects);
ret = gr->swap_buffers_with_damage(gr->egl_display,
egl_damage, nrects);
egl_rects, n_egl_rects);
} else {
ret = eglSwapBuffers(gr->egl_display, go->egl_surface);
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