test: use CAIRO_MIME_TYPE_UNIQUE_ID with record-text-transform

The PS output from this test is > 100MB due to the duplicated images.
Using CAIRO_MIME_TYPE_UNIQUE_ID reduces the PS output to 650k, runs
considerably faster, and now produces correct output.

test/cairo-test.c

@@ -1668,6 +1668,7 @@ cairo_test_create_surface_from_png (const cairo_test_context_t *ctx,
 {
     cairo_surface_t *image;
     cairo_status_t status;
+    char *unique_id;
 
     image = cairo_image_surface_create_from_png (filename);
     status = cairo_surface_status (image);
@@ -1683,6 +1684,10 @@ cairo_test_create_surface_from_png (const cairo_test_context_t *ctx,
 	    free (srcdir_filename);
 	}
     }
+    unique_id = strdup(filename);
+    cairo_surface_set_mime_data (image, CAIRO_MIME_TYPE_UNIQUE_ID,
+				 (unsigned char *)unique_id, strlen(unique_id),
+				 free, unique_id);
 
     return image;
 }

test/record.c

@@ -46,6 +46,8 @@ static uint32_t data[16] = {
     0xff00ff00, 0xff00ff00,		0xff0000ff, 0xff0000ff
 };
 
+static const char *unique_id = "data";
+
 static const char *png_filename = "romedalen.png";
 
 static cairo_t *
@@ -70,6 +72,9 @@ paint_alpha (cairo_t *cr)
 
     surface = cairo_image_surface_create_for_data ((unsigned char *) data,
 						   CAIRO_FORMAT_RGB24, 4, 4, 16);
+    cairo_surface_set_mime_data (surface, CAIRO_MIME_TYPE_UNIQUE_ID,
+				 (unsigned char *)unique_id, strlen(unique_id),
+				 NULL, NULL);
 
     cairo_test_paint_checkered (cr);
 
@@ -106,6 +111,9 @@ paint_alpha_clip (cairo_t *cr)
 
     surface = cairo_image_surface_create_for_data ((unsigned char *) data,
 						   CAIRO_FORMAT_RGB24, 4, 4, 16);
+    cairo_surface_set_mime_data (surface, CAIRO_MIME_TYPE_UNIQUE_ID,
+				 (unsigned char *)unique_id, strlen(unique_id),
+				 NULL, NULL);
 
     cairo_test_paint_checkered (cr);
 
@@ -131,6 +139,9 @@ paint_alpha_clip_mask (cairo_t *cr)
 
     surface = cairo_image_surface_create_for_data ((unsigned char *) data,
 						   CAIRO_FORMAT_RGB24, 4, 4, 16);
+    cairo_surface_set_mime_data (surface, CAIRO_MIME_TYPE_UNIQUE_ID,
+				 (unsigned char *)unique_id, strlen(unique_id),
+				 NULL, NULL);
 
     cairo_test_paint_checkered (cr);