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[glitz] Extended blend mode support

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Ensure that we fallback given an extended operator.
This commit is contained in:
Chris Wilson 2009-07-14 16:51:31 +01:00
parent 333d37a60f
commit 8ad3fca210
1 changed files with 60 additions and 20 deletions
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80
src/cairo-glitz-surface.c
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@ -441,10 +441,54 @@ _cairo_glitz_surface_set_matrix (cairo_glitz_surface_t *surface,
glitz_surface_set_transform (surface->surface, &transform);
}
static cairo_bool_t
_is_supported_operator (cairo_operator_t op)
{
/* This is really just a if (op < SATURATE), but we use a switch
* so the compiler will warn if we ever add more operators.
*/
switch (op) {
case CAIRO_OPERATOR_CLEAR:
case CAIRO_OPERATOR_SOURCE:
case CAIRO_OPERATOR_OVER:
case CAIRO_OPERATOR_IN:
case CAIRO_OPERATOR_OUT:
case CAIRO_OPERATOR_ATOP:
case CAIRO_OPERATOR_DEST:
case CAIRO_OPERATOR_DEST_OVER:
case CAIRO_OPERATOR_DEST_IN:
case CAIRO_OPERATOR_DEST_OUT:
case CAIRO_OPERATOR_DEST_ATOP:
case CAIRO_OPERATOR_XOR:
case CAIRO_OPERATOR_ADD:
return TRUE;
case CAIRO_OPERATOR_SATURATE:
/* nobody likes saturate, expect that it's required to do
* seamless polygons!
*/
case CAIRO_OPERATOR_MULTIPLY:
case CAIRO_OPERATOR_SCREEN:
case CAIRO_OPERATOR_OVERLAY:
case CAIRO_OPERATOR_DARKEN:
case CAIRO_OPERATOR_LIGHTEN:
case CAIRO_OPERATOR_COLOR_DODGE:
case CAIRO_OPERATOR_COLOR_BURN:
case CAIRO_OPERATOR_HARD_LIGHT:
case CAIRO_OPERATOR_SOFT_LIGHT:
case CAIRO_OPERATOR_DIFFERENCE:
case CAIRO_OPERATOR_EXCLUSION:
case CAIRO_OPERATOR_HSL_HUE:
case CAIRO_OPERATOR_HSL_SATURATION:
case CAIRO_OPERATOR_HSL_COLOR:
case CAIRO_OPERATOR_HSL_LUMINOSITY:
return FALSE;
}
}
static glitz_operator_t
_glitz_operator (cairo_operator_t op)
{
switch (op) {
switch ((int) op) {
case CAIRO_OPERATOR_CLEAR:
return GLITZ_OPERATOR_CLEAR;
@ -474,24 +518,17 @@ _glitz_operator (cairo_operator_t op)
return GLITZ_OPERATOR_XOR;
case CAIRO_OPERATOR_ADD:
return GLITZ_OPERATOR_ADD;
case CAIRO_OPERATOR_SATURATE:
/* XXX: This line should never be reached. Glitz backend should bail
out earlier if saturate operator is used. OpenGL can't do saturate
with pre-multiplied colors. Solid colors can still be done as we
can just un-pre-multiply them. However, support for that will have
to be added to glitz. */
/* fall-through */
break;
default:
ASSERT_NOT_REACHED;
/* Something's very broken if this line of code can be reached, so
* we want to return something that would give a noticeably
* incorrect result. The XOR operator seems so rearely desired
* that it should fit the bill here.
*/
return CAIRO_OPERATOR_XOR;
}
ASSERT_NOT_REACHED;
/* Something's very broken if this line of code can be reached, so
we want to return something that would give a noticeably
incorrect result. The XOR operator seems so rearely desired
that it should fit the bill here. */
return CAIRO_OPERATOR_XOR;
}
#define CAIRO_GLITZ_FEATURE_OK(surface, name) \
@ -897,7 +934,7 @@ _cairo_glitz_surface_composite (cairo_operator_t op,
cairo_glitz_surface_t *mask;
cairo_int_status_t status;
if (op == CAIRO_OPERATOR_SATURATE)
if (! _is_supported_operator (op))
return CAIRO_INT_STATUS_UNSUPPORTED;
if (_glitz_ensure_target (dst->surface))
@ -1002,6 +1039,9 @@ _cairo_glitz_surface_fill_rectangles (void *abstract_dst,
glitz_rectangle_t *current_rect;
int i;
if (! _is_supported_operator (op))
return CAIRO_INT_STATUS_UNSUPPORTED;
if (n_rects > ARRAY_LENGTH (stack_rects)) {
glitz_rects = _cairo_malloc_ab (n_rects, sizeof (glitz_rectangle_t));
if (glitz_rects == NULL)
@ -1133,7 +1173,7 @@ _cairo_glitz_surface_composite_trapezoids (cairo_operator_t op,
return CAIRO_INT_STATUS_UNSUPPORTED;
}
if (op == CAIRO_OPERATOR_SATURATE)
if (! _is_supported_operator (op))
return CAIRO_INT_STATUS_UNSUPPORTED;
if (_glitz_ensure_target (dst->surface))
@ -2028,7 +2068,7 @@ _cairo_glitz_surface_old_show_glyphs (cairo_scaled_font_t *scaled_font,
scaled_font->surface_backend != _cairo_glitz_surface_get_backend ())
return CAIRO_INT_STATUS_UNSUPPORTED;
if (op == CAIRO_OPERATOR_SATURATE)
if (! _is_supported_operator (op))
return CAIRO_INT_STATUS_UNSUPPORTED;
/* XXX Unbounded operators are not handled correctly */