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pdf: avoid using pdf patterns to paint/fill translucent linear/radial gradients

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This commit is contained in:
Adrian Johnson 2011-12-06 20:47:14 +10:30
parent 79f430e7ad
commit a8cbb00784
1 changed files with 57 additions and 34 deletions
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91
src/cairo-pdf-surface.c
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@ -3238,11 +3238,27 @@ _cairo_pdf_surface_emit_repeating_function (cairo_pdf_surface_t *surface,
static cairo_status_t
cairo_pdf_surface_emit_transparency_group (cairo_pdf_surface_t *surface,
cairo_pdf_pattern_t *pdf_pattern,
cairo_pdf_resource_t gstate_resource,
cairo_pdf_resource_t gradient_mask)
{
cairo_pdf_resource_t smask_resource;
cairo_status_t status;
char buf[100];
if (pdf_pattern->is_shading) {
snprintf(buf, sizeof(buf),
" /Shading\n"
" << /sh%d %d 0 R >>\n",
gradient_mask.id,
gradient_mask.id);
} else {
snprintf(buf, sizeof(buf),
" /Pattern\n"
" << /p%d %d 0 R >>\n",
gradient_mask.id,
gradient_mask.id);
}
status = _cairo_pdf_surface_open_stream (surface,
NULL,
@ -3255,8 +3271,7 @@ cairo_pdf_surface_emit_transparency_group (cairo_pdf_surface_t *surface,
" << /ExtGState\n"
" << /a0 << /ca 1 /CA 1 >>"
" >>\n"
" /Pattern\n"
" << /p%d %d 0 R >>\n"
"%s"
" >>\n"
" /Group\n"
" << /Type /Group\n"
@ -3265,24 +3280,29 @@ cairo_pdf_surface_emit_transparency_group (cairo_pdf_surface_t *surface,
" >>\n",
surface->width,
surface->height,
gradient_mask.id,
gradient_mask.id);
buf);
if (unlikely (status))
return status;
_cairo_output_stream_printf (surface->output,
"q\n"
"/a0 gs\n"
"/Pattern cs /p%d scn\n"
"0 0 %f %f re\n"
"f\n"
"Q\n",
gradient_mask.id,
surface->width,
surface->height);
if (pdf_pattern->is_shading) {
_cairo_output_stream_printf (surface->output,
"/a0 gs /sh%d sh\n",
gradient_mask.id);
} else {
_cairo_output_stream_printf (surface->output,
"q\n"
"/a0 gs\n"
"/Pattern cs /p%d scn\n"
"0 0 %f %f re\n"
"f\n"
"Q\n",
gradient_mask.id,
surface->width,
surface->height);
}
status = _cairo_pdf_surface_close_stream (surface);
if (unlikely (status))
status = _cairo_pdf_surface_close_stream (surface);
if (unlikely (status))
return status;
smask_resource = _cairo_pdf_surface_new_object (surface);
@ -3522,11 +3542,8 @@ _cairo_pdf_surface_emit_gradient (cairo_pdf_surface_t *surface,
&pat_to_pdf, &start, &end, domain,
"/DeviceGray", alpha_function);
status = _cairo_pdf_surface_add_pattern (surface, mask_resource);
if (unlikely (status))
return status;
status = cairo_pdf_surface_emit_transparency_group (surface,
pdf_pattern,
pdf_pattern->gstate_res,
mask_resource);
if (unlikely (status))
@ -3671,6 +3688,7 @@ _cairo_pdf_surface_emit_mesh_pattern (cairo_pdf_surface_t *surface,
res.id);
status = cairo_pdf_surface_emit_transparency_group (surface,
pdf_pattern,
pdf_pattern->gstate_res,
mask_resource);
if (unlikely (status))
@ -3825,8 +3843,6 @@ _cairo_pdf_surface_paint_gradient (cairo_pdf_surface_t *surface,
if (unlikely (status))
return status;
assert (gstate_res.id == 0);
pat_to_pdf = source->matrix;
status = cairo_matrix_invert (&pat_to_pdf);
/* cairo_pattern_set_matrix ensures the matrix is invertible */
@ -3845,19 +3861,29 @@ _cairo_pdf_surface_paint_gradient (cairo_pdf_surface_t *surface,
pat_to_pdf.x0, pat_to_pdf.y0);
}
status = _cairo_pdf_surface_add_alpha (surface, 1.0, &alpha);
if (unlikely (status))
return status;
status = _cairo_pdf_surface_add_shading (surface, shading_res);
if (unlikely (status))
return status;
if (gstate_res.id != 0) {
status = _cairo_pdf_surface_add_smask (surface, gstate_res);
if (unlikely (status))
return status;
_cairo_output_stream_printf (surface->output,
"/a%d gs /sh%d sh\n",
alpha,
shading_res.id);
_cairo_output_stream_printf (surface->output,
"/s%d gs /sh%d sh\n",
gstate_res.id,
shading_res.id);
} else {
status = _cairo_pdf_surface_add_alpha (surface, 1.0, &alpha);
if (unlikely (status))
return status;
_cairo_output_stream_printf (surface->output,
"/a%d gs /sh%d sh\n",
alpha,
shading_res.id);
}
return status;
}
@ -3891,8 +3917,6 @@ _cairo_pdf_surface_paint_pattern (cairo_pdf_surface_t *surface,
static cairo_bool_t
_can_paint_pattern (const cairo_pattern_t *pattern)
{
double min_alpha;
switch (pattern->type) {
case CAIRO_PATTERN_TYPE_SOLID:
return FALSE;
@ -3903,8 +3927,7 @@ _can_paint_pattern (const cairo_pattern_t *pattern)
case CAIRO_PATTERN_TYPE_LINEAR:
case CAIRO_PATTERN_TYPE_RADIAL:
_cairo_pattern_alpha_range (pattern, &min_alpha, NULL);
return CAIRO_ALPHA_IS_OPAQUE (min_alpha);
return TRUE;
case CAIRO_PATTERN_TYPE_MESH:
return FALSE;