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[pattern] Use a solid pattern for a uniform gradient.

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If each color stop in a gradient is identical, replace the gradient
surface with a simple solid surface. As seen in the wild.
This commit is contained in:
Chris Wilson 2008-12-18 00:47:08 +00:00
parent 25a4677200
commit 2d790daa95
1 changed files with 39 additions and 15 deletions
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54
src/cairo-pattern.c
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@ -2073,19 +2073,15 @@ _cairo_pattern_acquire_surface (const cairo_pattern_t *pattern,
if (src->n_stops)
{
cairo_color_t color;
_cairo_color_init_rgba (&color,
src->stops->color.red,
src->stops->color.green,
src->stops->color.blue,
src->stops->color.alpha);
_cairo_pattern_init_solid (&solid, &color, CAIRO_CONTENT_COLOR_ALPHA);
_cairo_pattern_init_solid (&solid,
&src->stops->color,
CAIRO_CONTENT_COLOR_ALPHA);
}
else
{
_cairo_pattern_init_solid (&solid, CAIRO_COLOR_TRANSPARENT, CAIRO_CONTENT_ALPHA);
_cairo_pattern_init_solid (&solid,
CAIRO_COLOR_TRANSPARENT,
CAIRO_CONTENT_ALPHA);
}
status = _cairo_pattern_acquire_surface_for_solid (&solid, dst,
@ -2096,11 +2092,39 @@ _cairo_pattern_acquire_surface (const cairo_pattern_t *pattern,
}
else
{
status = _cairo_pattern_acquire_surface_for_gradient (src, dst,
x, y,
width, height,
surface_out,
attributes);
unsigned int i;
/* Is the gradient a uniform colour?
* Happens more often than you would believe.
*/
for (i = 1; i < src->n_stops; i++) {
if (! _cairo_color_equal (&src->stops[0].color,
&src->stops[i].color))
{
break;
}
}
if (i == src->n_stops) {
cairo_solid_pattern_t solid;
_cairo_pattern_init_solid (&solid,
&src->stops->color,
CAIRO_CONTENT_COLOR_ALPHA);
status =
_cairo_pattern_acquire_surface_for_solid (&solid, dst,
x, y,
width, height,
surface_out,
attributes);
} else {
status =
_cairo_pattern_acquire_surface_for_gradient (src, dst,
x, y,
width, height,
surface_out,
attributes);
}
}
} break;
case CAIRO_PATTERN_TYPE_SURFACE: {