mp_image: add helper for copying image attributes

This enw function is similar to mp_image_set_params(), but doesn't force
setting "hard" parameters like image size and format.

2 files changed, 25 insertions, 0 deletions

diff --git a/video/mp_image.c b/video/mp_image.c
index 3bc76b669e..9b96bab67d 100644
--- a/video/mp_image.c
+++ b/video/mp_image.c
@@ -36,6 +36,8 @@
 #include "memcpy_pic.h"
 #include "fmt-conversion.h"
 
+#include "video/filter/vf.h"
+
 #if HAVE_PTHREADS
 #include <pthread.h>
 static pthread_mutex_t refcount_mutex = PTHREAD_MUTEX_INITIALIZER;
@@ -468,6 +470,26 @@ void mp_image_set_params(struct mp_image *image,
     image->chroma_location = params->chroma_location;
 }
 
+// Set most image parameters, but not image format or size.
+// Display size is used to set the PAR.
+void mp_image_set_attributes(struct mp_image *image,
+                             const struct mp_image_params *params)
+{
+    struct mp_image_params nparams = *params;
+    nparams.imgfmt = image->imgfmt;
+    nparams.w = image->w;
+    nparams.h = image->h;
+    if (nparams.imgfmt != params->imgfmt)
+        mp_image_params_guess_csp(&nparams);
+    if (nparams.w != params->w || nparams.h != params->h) {
+        if (nparams.d_w && nparams.d_h) {
+            vf_rescale_dsize(&nparams.d_w, &nparams.d_h,
+                             params->w, params->h, nparams.w, nparams.h);
+        }
+    }
+    mp_image_set_params(image, &nparams);
+}
+
 void mp_image_set_colorspace_details(struct mp_image *image,
                                      struct mp_csp_details *csp)
 {
diff --git a/video/mp_image.h b/video/mp_image.h
index e198c4e547..f7e7353475 100644
--- a/video/mp_image.h
+++ b/video/mp_image.h
@@ -153,6 +153,9 @@ void mp_image_params_from_image(struct mp_image_params *params,
 void mp_image_set_params(struct mp_image *image,
                          const struct mp_image_params *params);
 
+void mp_image_set_attributes(struct mp_image *image,
+                             const struct mp_image_params *params);
+
 struct AVFrame;
 void mp_image_copy_fields_from_av_frame(struct mp_image *dst,
                                         struct AVFrame *src);