Farm out the surface and pattern analysis functions away from cairo-ps-surface.c.

We're setting things up here for better sharing as PDF surface (and
others) now want to do some of the same analysis.

1 files changed, 28 insertions, 0 deletions

diff --git a/src/cairo-surface.c b/src/cairo-surface.c
index d0810aa96..5af49da5d 100644
--- a/src/cairo-surface.c
+++ b/src/cairo-surface.c
@@ -1693,3 +1693,31 @@ _cairo_surface_composite_shape_fixup_unbounded (cairo_surface_t            *dst,
     return _cairo_surface_composite_fixup_unbounded_internal (dst, src_rectangle, mask_rectangle,
 							      dst_x, dst_y, width, height);
 }
+
+static cairo_bool_t
+_format_is_opaque (cairo_format_t format)
+{
+    switch (format) {
+    case CAIRO_FORMAT_ARGB32:
+	return FALSE;
+    case CAIRO_FORMAT_RGB24:
+	return TRUE;
+    case CAIRO_FORMAT_A8:
+	return FALSE;
+    case CAIRO_FORMAT_A1:
+	return TRUE;
+    }
+    return FALSE;
+}
+
+cairo_bool_t
+_cairo_surface_is_opaque (const cairo_surface_t *surface)
+{ 
+    if (_cairo_surface_is_image (surface)) {
+	const cairo_image_surface_t *image_surface = (cairo_image_surface_t *) surface;
+
+	return _format_is_opaque (image_surface->format);
+    }
+
+    return TRUE;
+}