vo: add some general support code for VOs that allow rotation

For rotation, we assume that the source image will be rotated within the
VO, so the aspect/panscan code needs to calculate its param using
rotated coordinates. VOs which support rotation natively can use this.

1 files changed, 6 insertions, 0 deletions

diff --git a/video/out/vo.h b/video/out/vo.h
index 28cb3a00ed..b9887d2119 100644
--- a/video/out/vo.h
+++ b/video/out/vo.h
@@ -130,6 +130,9 @@ struct voctrl_screenshot_args {
 #define VOFLAG_GL_DEBUG         0x40  // Hint to request debug OpenGL context
 #define VOFLAG_ALPHA            0x80  // Hint to request alpha framebuffer
 
+// VO does handle mp_image_params.rotate in 90 degree steps
+#define VO_CAP_ROTATE90 1
+
 struct vo;
 struct osd_state;
 struct mp_image;
@@ -143,6 +146,9 @@ struct vo_driver {
     // Encoding functionality, which can be invoked via --o only.
     bool encode;
 
+    // VO_CAP_* bits
+    int caps;
+
     const char *name;
     const char *description;