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Optimize away calls to cairo_paint_with_alpha() if the alpha value given is <= 0.

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Add a new macro CAIRO_ALPHA_IS_ZERO.
This commit is contained in:
Billy Biggs 2005-08-21 21:04:52 +00:00
parent 89a4e13d73
commit fdb5e2aa47
3 changed files with 12 additions and 0 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2005-08-21 Billy Biggs <vektor@dumbterm.net>
* src/cairo.c: (cairo_paint_with_alpha): Optimize away calls to
cairo_paint_with_alpha() if the alpha value given is <= 0.
* src/cairoint.h: Add a new macro CAIRO_ALPHA_IS_ZERO.
2005-08-21 Billy Biggs <vektor@dumbterm.net>
Fix for bug #4172:

4
src/cairo.c
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@ -1302,6 +1302,10 @@ cairo_paint_with_alpha (cairo_t *cr,
return;
}
if (CAIRO_ALPHA_IS_ZERO (alpha)) {
return;
}
_cairo_color_init_rgba (&color, 1., 1., 1., alpha);
_cairo_pattern_init_solid (&pattern.solid, &color);

1
src/cairoint.h
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@ -178,6 +178,7 @@ typedef cairo_fixed_16_16_t cairo_fixed_t;
#define CAIRO_MINSHORT SHRT_MIN
#define CAIRO_ALPHA_IS_OPAQUE(alpha) ((alpha) >= ((double)0xff00 / (double)0xffff))
#define CAIRO_ALPHA_IS_ZERO(alpha) ((alpha) <= 0.0)
#include "cairo-hash-private.h"