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xlib: Handle subsurfaces correctly

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Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2011-11-23 15:40:15 +00:00
parent e217677ce6
commit 894d8c8bf7
1 changed files with 99 additions and 0 deletions
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99
src/cairo-xlib-source.c
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@ -541,6 +541,100 @@ solid_source (cairo_xlib_surface_t *dst,
return transparent_source (dst, color);
}
static cairo_surface_t *
subsurface_source (cairo_xlib_surface_t *dst,
const cairo_surface_pattern_t *pattern,
cairo_bool_t is_mask,
const cairo_rectangle_int_t *extents,
const cairo_rectangle_int_t *sample,
int *src_x, int *src_y)
{
cairo_surface_subsurface_t *sub;
cairo_xlib_surface_t *src;
Display *dpy = dst->display->display;
cairo_bool_t is_contained = FALSE;
cairo_int_status_t status;
cairo_surface_pattern_t local_pattern;
XTransform xtransform;
XRenderPictureAttributes pa;
unsigned mask = 0;
sub = (cairo_surface_subsurface_t *) pattern->surface;
if (sample->x >= 0 && sample->y >= 0 &&
sample->x + sample->width <= sub->extents.width &&
sample->y + sample->height <= sub->extents.height)
{
is_contained = TRUE;
}
if (pattern->base.filter == CAIRO_FILTER_NEAREST && is_contained &&
_cairo_matrix_is_translation (&pattern->base.matrix))
{
src = (cairo_xlib_surface_t *) sub->target;
_cairo_xlib_surface_ensure_picture (src);
*src_x += pattern->base.matrix.x0 + sub->extents.x;
*src_y += pattern->base.matrix.y0 + sub->extents.y;
return cairo_surface_reference (&src->base);
}
src = (cairo_xlib_surface_t *)
_cairo_surface_create_similar_scratch (&dst->base,
sub->base.content,
sub->extents.width,
sub->extents.height);
if (src->base.type != CAIRO_SURFACE_TYPE_XLIB) {
cairo_surface_destroy (&src->base);
return _cairo_surface_create_in_error (CAIRO_STATUS_NO_MEMORY);
}
_cairo_pattern_init_for_surface (&local_pattern, sub->target);
cairo_matrix_init_translate (&local_pattern.base.matrix,
sub->extents.x, sub->extents.y);
local_pattern.base.filter = CAIRO_FILTER_NEAREST;
status = _cairo_surface_paint (&src->base,
CAIRO_OPERATOR_SOURCE,
&local_pattern.base,
NULL);
_cairo_pattern_fini (&local_pattern.base);
if (unlikely (status)) {
cairo_surface_destroy (&src->base);
return _cairo_surface_create_in_error (status);
}
_cairo_xlib_surface_ensure_picture (src);
status = _cairo_matrix_to_pixman_matrix_offset (&pattern->base.matrix,
pattern->base.filter,
extents->x + extents->width / 2,
extents->y + extents->height / 2,
(pixman_transform_t *)&xtransform,
src_x, src_y);
if (status == CAIRO_INT_STATUS_SUCCESS)
XRenderSetPictureTransform (dpy, src->picture, &xtransform);
if (pattern->base.filter != CAIRO_FILTER_NEAREST)
picture_set_filter (dpy, src->picture, pattern->base.filter);
if (pattern->base.has_component_alpha) {
pa.component_alpha = 1;
mask |= CPComponentAlpha;
}
if (pattern->base.extend != CAIRO_EXTEND_NONE) {
pa.repeat = extend_to_repeat (pattern->base.extend);
mask |= CPRepeat;
}
if (mask)
XRenderChangePicture (dpy, src->picture, mask, &pa);
return &src->base;
}
static cairo_surface_t *
native_source (cairo_xlib_surface_t *dst,
const cairo_surface_pattern_t *pattern,
@ -558,6 +652,11 @@ native_source (cairo_xlib_surface_t *dst,
XRenderPictureAttributes pa;
int mask = 0;
if (_cairo_surface_is_subsurface (pattern->surface))
return subsurface_source (dst, pattern, is_mask,
extents, sample,
src_x, src_y);
src = (cairo_xlib_surface_t *)
unwrap_surface (pattern->surface, src_x, src_y);