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gstate: Reduce operators
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Some operators may be equivalent to simpler operations, so make the
transformation in the gstate, before calling down into the surface
backends.
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Chris Wilson committed Jan 22, 2010
1 parent 4d52be3 commit 13c5680
Showing 1 changed file with 72 additions and 14 deletions.
86 changes: 72 additions & 14 deletions src/cairo-gstate.c
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Original file line number Diff line number Diff line change
Expand Up @@ -975,6 +975,31 @@ _clipped (cairo_gstate_t *gstate)
return _cairo_clip_get_region (&gstate->clip, NULL) == CAIRO_INT_STATUS_NOTHING_TO_DO;
}

static cairo_operator_t
_reduce_op (cairo_gstate_t *gstate,
const cairo_pattern_union_t *pattern)
{
cairo_operator_t op;

op = gstate->op;
if (op == CAIRO_OPERATOR_SOURCE &&
pattern->type == CAIRO_PATTERN_TYPE_SOLID)
{
if (pattern->solid.color.alpha_short <= 0x00ff) {
op = CAIRO_OPERATOR_CLEAR;
} else if ((gstate->target->content & CAIRO_CONTENT_ALPHA) == 0) {
if ((pattern->solid.color.red_short |
pattern->solid.color.green_short |
pattern->solid.color.blue_short) <= 0x00ff)
{
op = CAIRO_OPERATOR_CLEAR;
}
}
}

return op;
}

cairo_status_t
_cairo_gstate_paint (cairo_gstate_t *gstate)
{
Expand All @@ -985,13 +1010,16 @@ _cairo_gstate_paint (cairo_gstate_t *gstate)
if (unlikely (gstate->source->status))
return gstate->source->status;

if (gstate->op == CAIRO_OPERATOR_DEST)
return CAIRO_STATUS_SUCCESS;

if (_clipped (gstate))
return CAIRO_STATUS_SUCCESS;

_cairo_gstate_copy_transformed_source (gstate, &pattern.base);

status = _cairo_surface_paint (gstate->target,
gstate->op,
_reduce_op (gstate, &pattern),
&pattern.base,
_gstate_get_clip (gstate, &clip));
_cairo_clip_fini (&clip);
Expand All @@ -1013,6 +1041,9 @@ _cairo_gstate_mask (cairo_gstate_t *gstate,
if (unlikely (gstate->source->status))
return gstate->source->status;

if (gstate->op == CAIRO_OPERATOR_DEST)
return CAIRO_STATUS_SUCCESS;

if (_clipped (gstate))
return CAIRO_STATUS_SUCCESS;

Expand Down Expand Up @@ -1050,14 +1081,14 @@ _cairo_gstate_mask (cairo_gstate_t *gstate,
mask_pattern.solid.content);

status = _cairo_surface_paint (gstate->target,
gstate->op,
_reduce_op (gstate, &source_pattern),
&source_pattern.base,
_gstate_get_clip (gstate, &clip));
}
else
{
status = _cairo_surface_mask (gstate->target,
gstate->op,
_reduce_op (gstate, &source_pattern),
&source_pattern.base,
&mask_pattern.base,
_gstate_get_clip (gstate, &clip));
Expand All @@ -1077,6 +1108,9 @@ _cairo_gstate_stroke (cairo_gstate_t *gstate, cairo_path_fixed_t *path)
if (unlikely (gstate->source->status))
return gstate->source->status;

if (gstate->op == CAIRO_OPERATOR_DEST)
return CAIRO_STATUS_SUCCESS;

if (gstate->stroke_style.line_width <= 0.0)
return CAIRO_STATUS_SUCCESS;

Expand All @@ -1086,7 +1120,7 @@ _cairo_gstate_stroke (cairo_gstate_t *gstate, cairo_path_fixed_t *path)
_cairo_gstate_copy_transformed_source (gstate, &source_pattern.base);

status = _cairo_surface_stroke (gstate->target,
gstate->op,
_reduce_op (gstate, &source_pattern),
&source_pattern.base,
path,
&gstate->stroke_style,
Expand Down Expand Up @@ -1167,6 +1201,9 @@ _cairo_gstate_fill (cairo_gstate_t *gstate, cairo_path_fixed_t *path)
if (unlikely (gstate->source->status))
return gstate->source->status;

if (gstate->op == CAIRO_OPERATOR_DEST)
return CAIRO_STATUS_SUCCESS;

if (_clipped (gstate))
return CAIRO_STATUS_SUCCESS;

Expand All @@ -1180,16 +1217,34 @@ _cairo_gstate_fill (cairo_gstate_t *gstate, cairo_path_fixed_t *path)
_gstate_get_clip (gstate, &clip));
} else {
cairo_pattern_union_t pattern;
cairo_operator_t op;
cairo_rectangle_int_t extents;
cairo_box_t box;

_cairo_gstate_copy_transformed_source (gstate, &pattern.base);
status = _cairo_surface_fill (gstate->target,
gstate->op,
&pattern.base,
path,
gstate->fill_rule,
gstate->tolerance,
gstate->antialias,
_gstate_get_clip (gstate, &clip));

op = _reduce_op (gstate, &pattern);

/* Toolkits often paint the entire background with a fill */
if (_cairo_surface_get_extents (gstate->target, &extents) &&
_cairo_path_fixed_is_box (path, &box) &&
box.p1.x <= _cairo_fixed_from_int (extents.x) &&
box.p1.y <= _cairo_fixed_from_int (extents.y) &&
box.p2.x >= _cairo_fixed_from_int (extents.x + extents.width) &&
box.p2.y >= _cairo_fixed_from_int (extents.y + extents.height))
{
status = _cairo_surface_paint (gstate->target, op, &pattern.base,
_gstate_get_clip (gstate, &clip));
}
else
{
status = _cairo_surface_fill (gstate->target, op, &pattern.base,
path,
gstate->fill_rule,
gstate->tolerance,
gstate->antialias,
_gstate_get_clip (gstate, &clip));
}
}

_cairo_clip_fini (&clip);
Expand Down Expand Up @@ -1794,6 +1849,9 @@ _cairo_gstate_show_text_glyphs (cairo_gstate_t *gstate,
if (unlikely (gstate->source->status))
return gstate->source->status;

if (gstate->op == CAIRO_OPERATOR_DEST)
return CAIRO_STATUS_SUCCESS;

if (_clipped (gstate))
return CAIRO_STATUS_SUCCESS;

Expand Down Expand Up @@ -1852,7 +1910,7 @@ _cairo_gstate_show_text_glyphs (cairo_gstate_t *gstate,
_cairo_scaled_font_get_max_scale (gstate->scaled_font) <= 10240)
{
status = _cairo_surface_show_text_glyphs (gstate->target,
gstate->op,
_reduce_op (gstate, &source_pattern),
&source_pattern.base,
utf8, utf8_len,
transformed_glyphs, num_glyphs,
Expand All @@ -1873,7 +1931,7 @@ _cairo_gstate_show_text_glyphs (cairo_gstate_t *gstate,

if (status == CAIRO_STATUS_SUCCESS) {
status = _cairo_surface_fill (gstate->target,
gstate->op,
_reduce_op (gstate, &source_pattern),
&source_pattern.base,
&path,
CAIRO_FILL_RULE_WINDING,
Expand Down

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