/* The first pass, we use mask as source, to get dst1 = (1 - ma) * dst) with
* DEST_OUT operator. In the second pass, we use ADD operator to achieve
* result = (src * ma) + dst1. Combining two passes, we have
* result = (src * ma) + (1 - ma) * dst
*/
static cairo_int_status_t
_cairo_gl_msaa_compositor_mask_source_operator (const cairo_compositor_t *compositor,
cairo_composite_rectangles_t *composite)
{
cairo_gl_composite_t setup;
cairo_gl_surface_t *dst = (cairo_gl_surface_t *) composite->surface;
cairo_gl_context_t *ctx = NULL;
cairo_int_status_t status;
cairo_traps_t traps;
_cairo_traps_init (&traps);
status = _cairo_gl_composite_init (&setup,
CAIRO_OPERATOR_DEST_OUT,
dst,
FALSE /* assume_component_alpha */);
if (unlikely (status))
goto finish;
_gl_pattern_fix_reference_count (composite->original_mask_pattern);
status = _cairo_gl_composite_set_source (&setup,
&composite->mask_pattern.base,
&composite->mask_sample_area,
&composite->bounded,
FALSE);
if (unlikely (status))
goto finish;
status = _cairo_gl_composite_begin_multisample (&setup, &ctx, TRUE);
if (unlikely (status))
goto finish;
if (! composite->clip)
status = _draw_int_rect (ctx, &setup, &composite->bounded);
else
status = _cairo_gl_msaa_compositor_draw_clip (ctx, &setup, composite->clip, &traps);
_cairo_gl_composite_fini (&setup);
status = _cairo_gl_context_release (ctx, status);
ctx = NULL;
if (unlikely (status))
return status;
/* second pass */
status = _cairo_gl_composite_init (&setup,
CAIRO_OPERATOR_ADD,
dst,
FALSE /* assume_component_alpha */);
if (unlikely (status))
goto finish;
_gl_pattern_fix_reference_count (composite->original_source_pattern);
status = _cairo_gl_composite_set_source (&setup,
&composite->source_pattern.base,
&composite->source_sample_area,
&composite->bounded,
FALSE);
if (unlikely (status))
goto finish;
status = _cairo_gl_composite_set_mask (&setup,
&composite->mask_pattern.base,
&composite->source_sample_area,
&composite->bounded);
if (unlikely (status))
goto finish;
/* We always use multisampling here, because we do not yet have the smarts
to calculate when the clip or the source requires it. */
status = _cairo_gl_composite_begin_multisample (&setup, &ctx, TRUE);
if (unlikely (status))
goto finish;
if (! composite->clip)
status = _draw_int_rect (ctx, &setup, &composite->bounded);
else
status = _cairo_gl_msaa_compositor_draw_clip (ctx, &setup, composite->clip, &traps);
finish:
_cairo_traps_fini (&traps);
_cairo_gl_composite_fini (&setup);
if (ctx)
status = _cairo_gl_context_release (ctx, status);
return status;
}
static cairo_int_status_t
_cairo_gl_msaa_compositor_mask (const cairo_compositor_t *compositor,
cairo_composite_rectangles_t *composite)
{
cairo_gl_composite_t setup;
cairo_gl_surface_t *dst = (cairo_gl_surface_t *) composite->surface;
cairo_gl_context_t *ctx = NULL;
cairo_int_status_t status;
cairo_operator_t op = composite->op;
cairo_traps_t traps;
cairo_bool_t use_color_attribute = FALSE;
if (! can_use_msaa_compositor (dst, CAIRO_ANTIALIAS_DEFAULT))
return CAIRO_INT_STATUS_UNSUPPORTED;
/* GL compositing operators cannot properly represent a mask operation
using the SOURCE compositing operator in one pass. This only matters if
there actually is a mask (there isn't in a paint operation) and if the
mask isn't totally opaque. */
if (op == CAIRO_OPERATOR_SOURCE &&
composite->original_mask_pattern != NULL &&
! _cairo_pattern_is_opaque (&composite->mask_pattern.base,
&composite->mask_sample_area)) {
/* If the source is opaque the operation reduces to OVER. */
if (_cairo_pattern_is_opaque (&composite->source_pattern.base,
&composite->source_sample_area))
op = CAIRO_OPERATOR_OVER;
else
return _cairo_gl_msaa_compositor_mask_source_operator (compositor, composite);
}
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;
}
return _paint_back_unbounded_surface (compositor, composite, surface);
}
status = _cairo_gl_composite_init (&setup,
op,
dst,
FALSE /* assume_component_alpha */);
if (unlikely (status))
goto finish;
_gl_pattern_fix_reference_count (composite->original_source_pattern);
if (! composite->clip ||
(composite->clip->num_boxes == 1 && ! composite->clip->path))
use_color_attribute = TRUE;
status = _cairo_gl_composite_set_source (&setup,
composite->original_source_pattern,
&composite->source_sample_area,
&composite->bounded,
use_color_attribute);
if (unlikely (status))
goto finish;
if (composite->original_mask_pattern != NULL) {
status = _cairo_gl_composite_set_mask (&setup,
composite->original_mask_pattern,
&composite->mask_sample_area,
&composite->bounded);
}
if (unlikely (status))
goto finish;
/* We always use multisampling here, because we do not yet have the smarts
to calculate when the clip or the source requires it. */
status = _cairo_gl_composite_begin_multisample (&setup, &ctx, TRUE);
if (unlikely (status))
goto finish;
_cairo_traps_init (&traps);
if (! composite->clip)
status = _draw_int_rect (ctx, &setup, &composite->bounded);
else
status = _cairo_gl_msaa_compositor_draw_clip (ctx, &setup, composite->clip, &traps);
_cairo_traps_fini (&traps);
finish:
_cairo_gl_composite_fini (&setup);
if (ctx)
status = _cairo_gl_context_release (ctx, status);
return status;
}
/* Masking with the SOURCE operator requires two passes. In the first
* pass we use the mask as the source to get:
* result = (1 - ma) * dst
* In the second pass we use the add operator to achieve:
* result = (src * ma) + dst
* Combined this produces:
* result = (src * ma) + (1 - ma) * dst
*/
static cairo_int_status_t
_cairo_gl_msaa_compositor_mask_source_operator (const cairo_compositor_t *compositor,
cairo_composite_rectangles_t *composite)
{
cairo_gl_composite_t setup;
cairo_gl_surface_t *dst = (cairo_gl_surface_t *) composite->surface;
cairo_gl_context_t *ctx = NULL;
cairo_int_status_t status;
cairo_clip_t *clip = composite->clip;
cairo_traps_t traps;
/* If we have a non-rectangular clip, we can avoid using the stencil buffer
* for clipping and just draw the clip polygon. */
if (clip) {
status = _clip_to_traps (clip, &traps);
if (unlikely (status)) {
_cairo_traps_fini (&traps);
return status;
}
}
status = _cairo_gl_composite_init (&setup,
CAIRO_OPERATOR_DEST_OUT,
dst,
FALSE /* assume_component_alpha */);
if (unlikely (status))
return status;
status = _cairo_gl_composite_set_source (&setup,
&composite->mask_pattern.base,
&composite->mask_sample_area,
&composite->bounded,
FALSE);
if (unlikely (status))
goto finish;
_cairo_gl_composite_set_multisample (&setup);
status = _cairo_gl_composite_begin (&setup, &ctx);
if (unlikely (status))
goto finish;
if (! clip)
status = _draw_int_rect (ctx, &setup, &composite->bounded);
else
status = _draw_traps (ctx, &setup, &traps);
/* Now draw the second pass. */
_cairo_gl_composite_set_operator (&setup, CAIRO_OPERATOR_ADD,
FALSE /* assume_component_alpha */);
if (unlikely (status))
goto finish;
status = _cairo_gl_composite_set_source (&setup,
&composite->source_pattern.base,
&composite->source_sample_area,
&composite->bounded,
FALSE);
if (unlikely (status))
goto finish;
status = _cairo_gl_composite_set_mask (&setup,
&composite->mask_pattern.base,
&composite->source_sample_area,
&composite->bounded,
FALSE);
if (unlikely (status))
goto finish;
status = _cairo_gl_set_operands_and_operator (&setup, ctx);
if (unlikely (status))
goto finish;
if (! clip)
status = _draw_int_rect (ctx, &setup, &composite->bounded);
else
status = _draw_traps (ctx, &setup, &traps);
finish:
_cairo_gl_composite_fini (&setup);
if (ctx)
status = _cairo_gl_context_release (ctx, status);
if (clip)
_cairo_traps_fini (&traps);
return status;
}
