sws_utils: refactor swscale wrapper code

This splits the monolithic mp_image_swscale() function into a bunch of
functions and a context struct. This means it's possible to set
arbitrary parameters (e.g. even obscure ones without getting in the
way), and you don't have to create the context on every call.

This code is preparation for removing duplicated libswscale API usage
from other parts of the code.

1 files changed, 6 insertions, 3 deletions

diff --git a/video/mp_image.h b/video/mp_image.h
index 69e3ae52b0..7324423967 100644
--- a/video/mp_image.h
+++ b/video/mp_image.h
@@ -131,15 +131,18 @@ struct mp_image *mp_image_new_external_ref(struct mp_image *img, void *arg,
                                            bool (*is_unique)(void *arg),
                                            void (*free)(void *arg));
 
-enum mp_csp mp_image_csp(struct mp_image *img);
-enum mp_csp_levels mp_image_levels(struct mp_image *img);
-
 struct mp_csp_details;
 void mp_image_set_colorspace_details(struct mp_image *image,
                                      struct mp_csp_details *csp);
 
 void mp_image_params_guess_csp(struct mp_image_params *params);
 
+bool mp_image_params_equals(const struct mp_image_params *p1,
+                            const struct mp_image_params *p2);
+
+void mp_image_params_from_image(struct mp_image_params *params,
+                                const struct mp_image *image);
+
 struct AVFrame;
 void mp_image_copy_fields_from_av_frame(struct mp_image *dst,
                                         struct AVFrame *src);