sws_utils: hack in zimg redirection support

Awful shit. I probably wouldn't accept this code from someone else, just
so you know.

The idea is that a sws_utils user can automatically use zimg without
large code changes. Basically, laziness. Since zimg support is still
very new, and I don't want that anything breaks just because zimg was
enabled at build time, an option needs to be set to enable it. (I have
especially especially obscure stuff in mind, which is all what
libswscale is used in mpv.)

This _still_ doesn't cause zimg to be used anywhere, because the
sws_utils user has to opt-in by setting allow_zimg. This is because some
users depend on certain libswscale features.

1 files changed, 5 insertions, 2 deletions

diff --git a/video/sws_utils.h b/video/sws_utils.h
index 629e6be2dd..1d40ceab66 100644
--- a/video/sws_utils.h
+++ b/video/sws_utils.h
@@ -31,6 +31,7 @@ struct mp_sws_context {
     // mp_sws_scale() will handle the changes transparently.
     int flags;
     int brightness, contrast, saturation;
+    bool allow_zimg; // use zimg if available (ignores filters and all)
     bool force_reload;
     // These are also implicitly set by mp_sws_scale(), and thus optional.
     // Setting them before that call makes sense when using mp_sws_reinit().
@@ -46,8 +47,10 @@ struct mp_sws_context {
     struct SwsContext *sws;
     bool supports_csp;
 
-    // Contains parameters for which sws is valid
-    struct mp_sws_context *cached;
+    // Private.
+    struct mp_sws_context *cached; // contains parameters for which sws is valid
+    struct mp_zimg_context *zimg;
+    bool opts_allow_zimg, zimg_ok;
 };
 
 struct mp_sws_context *mp_sws_alloc(void *talloc_ctx);