[cairo] [PATCH 1/2] Don't return NULL to clients when getting image

[Bryce Harrington]

Return an error surface instead.

Fixes:  https://bugs.freedesktop.org/show_bug.cgi?id=58061

Signed-off-by: Bryce Harrington <bryce at osg.samsung.com>
---
 src/cairo-qt-surface.cpp         |    2 +-
 src/cairo-quartz-image-surface.c |    2 +-
 src/win32/cairo-win32-surface.c  |    2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/cairo-qt-surface.cpp b/src/cairo-qt-surface.cpp
index 8a91984..d1c7760 100644
--- a/src/cairo-qt-surface.cpp
+++ b/src/cairo-qt-surface.cpp
@@ -1688,7 +1688,7 @@ cairo_qt_surface_get_image (cairo_surface_t *surface)
     cairo_qt_surface_t *qs = (cairo_qt_surface_t*) surface;
 
     if (surface->type != CAIRO_SURFACE_TYPE_QT)
-        return NULL;
+        return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_SURFACE_TYPE_MISMATCH));
 
     return qs->image_equiv;
 }
diff --git a/src/cairo-quartz-image-surface.c b/src/cairo-quartz-image-surface.c
index 2715abd..511b634 100644
--- a/src/cairo-quartz-image-surface.c
+++ b/src/cairo-quartz-image-surface.c
@@ -379,7 +379,7 @@ cairo_quartz_image_surface_get_image (cairo_surface_t *asurface)
     cairo_quartz_image_surface_t *surface = (cairo_quartz_image_surface_t*) asurface;
 
     if (asurface->type != CAIRO_SURFACE_TYPE_QUARTZ_IMAGE)
-	return NULL;
+        return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_SURFACE_TYPE_MISMATCH));
 
     return (cairo_surface_t*) surface->imageSurface;
 }
diff --git a/src/win32/cairo-win32-surface.c b/src/win32/cairo-win32-surface.c
index 7cd46fc..f11cbd8 100644
--- a/src/win32/cairo-win32-surface.c
+++ b/src/win32/cairo-win32-surface.c
@@ -188,7 +188,7 @@ cairo_surface_t *
 cairo_win32_surface_get_image (cairo_surface_t *surface)
 {
     if (surface->backend->type != CAIRO_SURFACE_TYPE_WIN32)
-	return NULL;
+        return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_SURFACE_TYPE_MISMATCH));
 
     GdiFlush();
     return to_win32_display_surface(surface)->image;
-- 
1.7.9.5