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surface: skip OVER is the source is clear.

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If the source has no alpha, the OVER operation becomes DST, i.e. a
no-op.
This commit is contained in:
Chris Wilson 2010-04-27 18:56:23 +01:00
parent 453b1cba11
commit f5cf131a9d
1 changed files with 24 additions and 0 deletions
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24
src/cairo-surface.c
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@ -1926,6 +1926,12 @@ _cairo_surface_paint (cairo_surface_t *surface,
if (op == CAIRO_OPERATOR_CLEAR && surface->is_clear)
return CAIRO_STATUS_SUCCESS;
if (op == CAIRO_OPERATOR_OVER &&
_cairo_pattern_is_clear (source))
{
return CAIRO_STATUS_SUCCESS;
}
status = _pattern_has_error (source);
if (unlikely (status))
return status;
@ -1971,6 +1977,12 @@ _cairo_surface_mask (cairo_surface_t *surface,
return CAIRO_STATUS_SUCCESS;
}
if (op == CAIRO_OPERATOR_OVER &&
_cairo_pattern_is_clear (source))
{
return CAIRO_STATUS_SUCCESS;
}
status = _pattern_has_error (source);
if (unlikely (status))
return status;
@ -2097,6 +2109,12 @@ _cairo_surface_stroke (cairo_surface_t *surface,
if (op == CAIRO_OPERATOR_CLEAR && surface->is_clear)
return CAIRO_STATUS_SUCCESS;
if (op == CAIRO_OPERATOR_OVER &&
_cairo_pattern_is_clear (source))
{
return CAIRO_STATUS_SUCCESS;
}
status = _pattern_has_error (source);
if (unlikely (status))
return status;
@ -2147,6 +2165,12 @@ _cairo_surface_fill (cairo_surface_t *surface,
if (op == CAIRO_OPERATOR_CLEAR && surface->is_clear)
return CAIRO_STATUS_SUCCESS;
if (op == CAIRO_OPERATOR_OVER &&
_cairo_pattern_is_clear (source))
{
return CAIRO_STATUS_SUCCESS;
}
status = _pattern_has_error (source);
if (unlikely (status))
return status;