PDF: Don't embed the same pattern more than once

The PDF surface now keeps track of all the patterns it is embedding in
a hash table keyed by the unique_id returned by the
_cairo_surface_get_unique_id().

1 files changed, 10 insertions, 3 deletions

diff --git a/src/cairo-pdf-surface-private.h b/src/cairo-pdf-surface-private.h
index d2fa43c4..e64b78ac 100644
--- a/src/cairo-pdf-surface-private.h
+++ b/src/cairo-pdf-surface-private.h
@@ -60,13 +60,19 @@ typedef struct _cairo_pdf_group_resources {
     cairo_array_t fonts;
 } cairo_pdf_group_resources_t;
 
+typedef struct _cairo_pdf_pattern_entry {
+    cairo_hash_entry_t base;
+    unsigned int id;
+    cairo_pdf_resource_t pattern_res;
+    cairo_pdf_resource_t gstate_res;
+} cairo_pdf_pattern_entry_t;
+
 typedef struct _cairo_pdf_pattern {
     double width;
     double height;
     cairo_rectangle_int_t extents;
     cairo_pattern_t *pattern;
-    cairo_pdf_resource_t pattern_res;
-    cairo_pdf_resource_t gstate_res;
+    cairo_pdf_pattern_entry_t *hash_entry;
 } cairo_pdf_pattern_t;
 
 typedef enum _cairo_pdf_operation {
@@ -118,7 +124,8 @@ struct _cairo_pdf_surface {
     cairo_array_t pages;
     cairo_array_t rgb_linear_functions;
     cairo_array_t alpha_linear_functions;
-    cairo_array_t patterns;
+    cairo_array_t page_patterns;
+    cairo_hash_table_t *all_patterns;
     cairo_array_t smask_groups;
     cairo_array_t knockout_group;