video: handle hwdec screenshots differently

Instead of converting the hw surface to an image in the VO, provide a
generic way to convet hw surfaces, and use this in the screenshot code.

It's all relatively straightforward, except vdpau is being terrible. It
needs a huge chunk of new code, because copying back is not simple.

1 files changed, 1 insertions, 3 deletions

diff --git a/video/out/gl_hwdec.h b/video/out/gl_hwdec.h
index 8d2f563d5e..ffe685fa97 100644
--- a/video/out/gl_hwdec.h
+++ b/video/out/gl_hwdec.h
@@ -43,9 +43,7 @@ struct gl_hwdec_driver {
     // Undo map_image(). The user of map_image() calls this when the textures
     // are not needed anymore.
     void (*unmap_image)(struct gl_hwdec *hw);
-    // Return a mp_image downloaded from the GPU (optional)
-    struct mp_image *(*download_image)(struct gl_hwdec *hw,
-                                       struct mp_image *hw_image);
+
     void (*destroy)(struct gl_hwdec *hw);
 };