PDF: Add simple implementation of _cairo_pdf_surface_show_glyphs (text as paths).

This isn't very exciting text output---it simply turns every call to
cairo_show_glyphs into a single filled path. But at the very least,
text will no longer trigger image fallbacks for the PDF backend.

With this commit, the following tests change from all-fallback to
all-native for the PDF backend:

	show-text-current-point
	text-antialias-gray
	text-antialias-none
	text-antialias-subpixel
	text-cache-crash
	text-rotate

There are rasterization differences in the output (cairo vs. freetype)
so this commit also adds new PDF-specific reference images for some of
those tests so that the suite continues to report PASS.

1 files changed, 24 insertions, 3 deletions

diff --git a/src/cairo-pdf-surface.c b/src/cairo-pdf-surface.c
index 64b564180..8c2252aa3 100644
--- a/src/cairo-pdf-surface.c
+++ b/src/cairo-pdf-surface.c
@@ -41,6 +41,7 @@
 #include "cairo-font-subset-private.h"
 #include "cairo-ft-private.h"
 #include "cairo-paginated-surface-private.h"
+#include "cairo-path-fixed-private.h"
 
 #include <time.h>
 #include <zlib.h>
@@ -2342,13 +2343,33 @@ _cairo_pdf_surface_show_glyphs (void			*abstract_surface,
 				cairo_scaled_font_t	*scaled_font)
 {
     cairo_pdf_surface_t *surface = abstract_surface;
+    cairo_pdf_document_t *document = surface->document;
+    cairo_path_fixed_t path;
+    cairo_status_t status;
 
     if (surface->paginated_mode == CAIRO_PAGINATED_MODE_ANALYZE)
-	return CAIRO_INT_STATUS_UNSUPPORTED;
+	return _analyze_operation (surface, op, source);
 
-    ASSERT_NOT_REACHED;
+    assert (_operation_supported (surface, op, source));
 
-    return CAIRO_INT_STATUS_UNSUPPORTED;
+    status = emit_pattern (surface, source);
+    if (status)
+	return status;
+
+    /* After emitting the pattern the current stream should belong to
+     * this surface, so no need to _cairo_pdf_surface_ensure_stream()
+     */
+    assert (document->current_stream != NULL &&
+	    document->current_stream == surface->current_stream);
+
+    _cairo_path_fixed_init (&path);
+    _cairo_scaled_font_glyph_path (scaled_font, glyphs, num_glyphs, &path);
+    status = _cairo_pdf_surface_fill (surface, op, source,
+				      &path, CAIRO_FILL_RULE_WINDING,
+				      0.1, scaled_font->options.antialias);
+    _cairo_path_fixed_fini (&path);
+
+    return status;
 }
 
 static void