diff options
| author | Andrea Canciani <ranma42@gmail.com> | 2010-12-04 14:58:52 +0100 |
|---|---|---|
| committer | Andrea Canciani <ranma42@gmail.com> | 2010-12-13 09:46:09 +0100 |
| commit | d1e9bdf7f15fd2ba7d42c6fe18650618d29c4942 (patch) | |
| tree | 18b440e7829cb41926c56659d9141750799320e0 /src/cairo-ps-surface.c | |
| parent | ec4c085624d12cef51e583c18306fd4f4c2b6aaa (diff) | |
ps: Avoid unneeded fallbacks for gradients with opaque stops.
_cairo_pattern_is_opaque() returns false for none-extended linear
gradients and for radial gradients, but fallback is only needed if
they have non-opaque stops.
This can be tested using _cairo_pattern_alpha_range(), which only
analyses the part of the pattern which is drawn.
Reviewed-by: M Joonas Pihlaja <jpihlaja@cc.helsinki.fi>
Diffstat (limited to 'src/cairo-ps-surface.c')
| -rw-r--r-- | src/cairo-ps-surface.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/src/cairo-ps-surface.c b/src/cairo-ps-surface.c index 784e8899..b53157e6 100644 --- a/src/cairo-ps-surface.c +++ b/src/cairo-ps-surface.c @@ -1779,6 +1779,8 @@ _cairo_ps_surface_analyze_operation (cairo_ps_surface_t *surface, const cairo_pattern_t *pattern, const cairo_rectangle_int_t *extents) { + double min_alpha; + if (surface->force_fallbacks && surface->paginated_mode == CAIRO_PAGINATED_MODE_ANALYZE) { @@ -1823,7 +1825,11 @@ _cairo_ps_surface_analyze_operation (cairo_ps_surface_t *surface, surface_pattern); } - if (_cairo_pattern_is_opaque (pattern, extents)) + /* Patterns whose drawn part is opaque are directly supported; + those whose drawn part is partially transparent can be + supported by flattening the alpha. */ + _cairo_pattern_alpha_range (pattern, &min_alpha, NULL); + if (CAIRO_ALPHA_IS_OPAQUE (min_alpha)) return CAIRO_STATUS_SUCCESS; return CAIRO_INT_STATUS_FLATTEN_TRANSPARENCY; |