/**
* _cairo_region_extents_rectangle:
* @region: a #pixman_region16_t
* @rect: rectangle into which to store the extents
*
* Gets the bounding box of a region as a cairo_rectangle_t
**/
void
_cairo_region_extents_rectangle (pixman_region16_t *region,
cairo_rectangle_t *rect)
{
pixman_box16_t *region_extents = pixman_region_extents (region);
rect->x = region_extents->x1;
rect->y = region_extents->y1;
rect->width = region_extents->x2 - region_extents->x1;
rect->height = region_extents->y2 - region_extents->y1;
}
/* XXX: There are failure cases in this function. Don't we need to
* propagate the errors out?
*/
void
pixman_composite_trapezoids (pixman_operator_t op,
pixman_image_t *src,
pixman_image_t *dst,
int xSrc,
int ySrc,
const pixman_trapezoid_t *traps,
int ntraps)
{
pixman_image_t *image = NULL;
pixman_box16_t traps_bounds, dst_bounds, bounds;
pixman_region16_t *traps_region, *dst_region;
int16_t xDst, yDst;
int16_t xRel, yRel;
pixman_format_t *format;
if (ntraps == 0)
return;
/*
* Check for solid alpha add
*/
if (op == PIXMAN_OPERATOR_ADD && miIsSolidAlpha (src))
{
for (; ntraps; ntraps--, traps++)
fbRasterizeTrapezoid (dst, traps, 0, 0);
return;
}
xDst = traps[0].left.p1.x >> 16;
yDst = traps[0].left.p1.y >> 16;
pixman_trapezoid_bounds (ntraps, traps, &traps_bounds);
traps_region = pixman_region_create_simple (&traps_bounds);
/* XXX: If the image has a clip region set, we should really be
* fetching it here instead, but it looks like we don't yet expose
* a pixman_image_get_clip_region function. */
dst_bounds.x1 = 0;
dst_bounds.y1 = 0;
dst_bounds.x2 = pixman_image_get_width (dst);
dst_bounds.y2 = pixman_image_get_height (dst);
dst_region = pixman_region_create_simple (&dst_bounds);
pixman_region_intersect (traps_region, traps_region, dst_region);
bounds = *(pixman_region_extents (traps_region));
pixman_region_destroy (traps_region);
pixman_region_destroy (dst_region);
if (bounds.y1 >= bounds.y2 || bounds.x1 >= bounds.x2)
return;
format = pixman_format_create (PIXMAN_FORMAT_NAME_A8);
if (!format)
return;
image = FbCreateAlphaPicture (dst, format,
bounds.x2 - bounds.x1,
bounds.y2 - bounds.y1);
if (!image)
{
pixman_format_destroy (format);
return;
}
for (; ntraps; ntraps--, traps++)
{
if (!xTrapezoidValid(traps))
continue;
fbRasterizeTrapezoid (image, traps,
-bounds.x1, -bounds.y1);
}
xRel = bounds.x1 + xSrc - xDst;
yRel = bounds.y1 + ySrc - yDst;
pixman_composite (op, src, image, dst,
xRel, yRel, 0, 0, bounds.x1, bounds.y1,
bounds.x2 - bounds.x1,
bounds.y2 - bounds.y1);
pixman_image_destroy (image);
pixman_format_destroy (format);
}