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gl/msaa: Implement paint via masking

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Instead of falling back to the spans compositor, let the msaa
compositor handle painting. This ensure clipping is handled
in a consistent way with the rest of the msaa compositor.
This commit is contained in:
Henry (Yu) Song 2011-12-23 08:44:16 -08:00 • committed by Martin Robinson
parent 4d9064d578
commit 5ae53c933a
1 changed files with 39 additions and 12 deletions
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51
src/cairo-gl-msaa-compositor.c
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@ -278,6 +278,22 @@ _scissor_and_clip (cairo_gl_context_t *ctx,
return CAIRO_INT_STATUS_SUCCESS;
}
static cairo_bool_t
_should_use_unbounded_surface (cairo_composite_rectangles_t *composite)
{
cairo_gl_surface_t *dst = (cairo_gl_surface_t *) composite->surface;
cairo_rectangle_int_t *source = &composite->source;
if (composite->is_bounded)
return FALSE;
/* This isn't just an optimization. It also detects when painting is used
to paint back the unbounded surface, preventing infinite recursion. */
return ! (source->x <= 0 && source->y <= 0 &&
source->height + source->y >= dst->height &&
source->width + source->x >= dst->width);
}
static cairo_surface_t*
_prepare_unbounded_surface (cairo_gl_surface_t *dst)
{
@ -330,13 +346,6 @@ should_fall_back (cairo_gl_surface_t *surface,
return ! surface->supports_msaa;
}
static cairo_int_status_t
_cairo_gl_msaa_compositor_paint (const cairo_compositor_t *compositor,
cairo_composite_rectangles_t *composite)
{
return CAIRO_INT_STATUS_UNSUPPORTED;
}
static cairo_int_status_t
_cairo_gl_msaa_compositor_mask (const cairo_compositor_t *compositor,
cairo_composite_rectangles_t *composite)
@ -368,17 +377,26 @@ _cairo_gl_msaa_compositor_mask (const cairo_compositor_t *compositor,
return CAIRO_INT_STATUS_UNSUPPORTED;
}
if (composite->is_bounded == FALSE) {
if (_should_use_unbounded_surface (composite)) {
cairo_surface_t* surface = _prepare_unbounded_surface (dst);
if (unlikely (surface == NULL))
return CAIRO_INT_STATUS_UNSUPPORTED;
/* This may be a paint operation. */
if (composite->original_mask_pattern == NULL) {
status = _cairo_compositor_paint (compositor, surface,
CAIRO_OPERATOR_SOURCE,
&composite->source_pattern.base,
NULL);
} else {
status = _cairo_compositor_mask (compositor, surface,
CAIRO_OPERATOR_SOURCE,
&composite->source_pattern.base,
&composite->mask_pattern.base,
NULL);
}
if (unlikely (status)) {
cairo_surface_destroy (surface);
return status;
@ -401,10 +419,12 @@ _cairo_gl_msaa_compositor_mask (const cairo_compositor_t *compositor,
if (unlikely (status))
goto finish;
status = _cairo_gl_composite_set_mask (&setup,
&composite->mask_pattern.base,
&composite->source_sample_area,
&composite->bounded);
if (composite->original_mask_pattern != NULL) {
status = _cairo_gl_composite_set_mask (&setup,
&composite->mask_pattern.base,
&composite->mask_sample_area,
&composite->bounded);
}
if (unlikely (status))
goto finish;
@ -433,6 +453,13 @@ finish:
return status;
}
static cairo_int_status_t
_cairo_gl_msaa_compositor_paint (const cairo_compositor_t *compositor,
cairo_composite_rectangles_t *composite)
{
return _cairo_gl_msaa_compositor_mask (compositor, composite);
}
static cairo_status_t
_stroke_shaper_add_triangle (void *closure,
const cairo_point_t triangle[3])