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PDF: Fix regression in EXTEND_NONE gradients

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The test for opaque gradients in _cairo_pdf_surface_add_pdf_pattern()
must be identical to the test in
_cairo_pdf_surface_emit_pattern_stops() other wise the PDF file will
reference a smask that does not exist.

The _cairo_pattern_is_opaque() test is too strict for PDF as PDF can
draw EXTEND_NONE gradients with opaque color stops without requiring a
smask.
(cherry picked from commit 7a17ef3176)
This commit is contained in:
Adrian Johnson 2010-10-14 19:28:13 +10:30
parent 7450a3c8a7
commit f747ea81fb
1 changed files with 14 additions and 1 deletions
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15
src/cairo-pdf-surface.c
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@ -1202,6 +1202,18 @@ _cairo_pdf_surface_add_source_surface (cairo_pdf_surface_t *surface,
return status;
}
static cairo_bool_t
_gradient_stops_are_opaque (const cairo_gradient_pattern_t *gradient)
{
unsigned int i;
for (i = 0; i < gradient->n_stops; i++)
if (! CAIRO_COLOR_IS_OPAQUE (&gradient->stops[i].color))
return FALSE;
return TRUE;
}
static cairo_status_t
_cairo_pdf_surface_add_pdf_pattern (cairo_pdf_surface_t *surface,
const cairo_pattern_t *pattern,
@ -1235,7 +1247,8 @@ _cairo_pdf_surface_add_pdf_pattern (cairo_pdf_surface_t *surface,
if (pattern->type == CAIRO_PATTERN_TYPE_LINEAR ||
pattern->type == CAIRO_PATTERN_TYPE_RADIAL)
{
if (_cairo_pattern_is_opaque (pattern, extents) == FALSE) {
cairo_gradient_pattern_t *gradient = (cairo_gradient_pattern_t *) pattern;
if (! _gradient_stops_are_opaque (gradient)) {
pdf_pattern.gstate_res = _cairo_pdf_surface_new_object (surface);
if (pdf_pattern.gstate_res.id == 0) {
cairo_pattern_destroy (pdf_pattern.pattern);