screenshot, vo_image: use global swscale/zimg parameters

Lots of dumb crap to do... something. Instead of adding yet another dumb
helper, just use the main" sws_utils API in both callers. (Which,
unfortunately, has been duplicated for glorious webp screenshots,
despite the fact that webp is crap.)

Good part: can enable zimg for screenshots (as far as needed).
Bad part: uses "default" swscale parameters instead of HQ now.

player/screenshot.c

@@ -83,7 +83,8 @@ static bool write_screenshot(struct mp_cmd_ctx *cmd, struct mp_image *img,
 
     mp_core_unlock(mpctx);
 
-    bool ok = img && write_image(img, &opts_copy, filename, mpctx->log);
+    bool ok = img && write_image(img, &opts_copy, filename, mpctx->global,
+                                 mpctx->log);
 
     mp_core_lock(mpctx);
 
@@ -370,7 +371,7 @@ static struct mp_image *screenshot_get(struct MPContext *mpctx, int mode,
 }
 
 struct mp_image *convert_image(struct mp_image *image, int destfmt,
-                               struct mp_log *log)
+                               struct mpv_global *global, struct mp_log *log)
 {
     int d_w, d_h;
     mp_image_params_get_dsize(&image->params, &d_w, &d_h);
@@ -396,7 +397,14 @@ struct mp_image *convert_image(struct mp_image *image, int destfmt,
 
     dst->params = p;
 
-    if (mp_image_swscale(dst, image, mp_sws_hq_flags) < 0) {
+    struct mp_sws_context *sws = mp_sws_alloc(NULL);
+    sws->log = log;
+    if (global)
+        mp_sws_enable_cmdline_opts(sws, global);
+    bool ok = mp_sws_scale(sws, dst, image) >= 0;
+    talloc_free(sws);
+
+    if (!ok) {
         mp_err(log, "Error when converting image.\n");
         talloc_free(dst);
         return NULL;
@@ -411,7 +419,8 @@ static struct mp_image *screenshot_get_rgb(struct MPContext *mpctx, int mode)
     struct mp_image *mpi = screenshot_get(mpctx, mode, false);
     if (!mpi)
         return NULL;
-    struct mp_image *res = convert_image(mpi, IMGFMT_BGR0, mpctx->log);
+    struct mp_image *res = convert_image(mpi, IMGFMT_BGR0, mpctx->global,
+                                         mpctx->log);
     talloc_free(mpi);
     return res;
 }

player/screenshot.h

@@ -23,6 +23,7 @@
 struct MPContext;
 struct mp_image;
 struct mp_log;
+struct mpv_global;
 
 // One time initialization at program start.
 void screenshot_init(struct MPContext *mpctx);
@@ -32,9 +33,10 @@ void screenshot_flip(struct MPContext *mpctx);
 
 /* Return the image converted to the given format. If the pixel aspect ratio is
  * not 1:1, the image is scaled as well. Returns NULL on failure.
+ * If global!=NULL, use command line scaler options etc.
  */
 struct mp_image *convert_image(struct mp_image *image, int destfmt,
-                               struct mp_log *log);
+                               struct mpv_global *global, struct mp_log *log);
 
 // Handlers for the user-facing commands.
 void cmd_screenshot(void *p);

video/image_loader.c

@@ -38,7 +38,7 @@ struct mp_image *load_image_png_buf(void *buffer, size_t buffer_size, int imgfmt
     if (frame && avcodec_receive_frame(avctx, frame) >= 0) {
         struct mp_image *r = mp_image_from_av_frame(frame);
         if (r)
-            res = convert_image(r, imgfmt, mp_null_log);
+            res = convert_image(r, imgfmt, NULL, mp_null_log);
         talloc_free(r);
     }
     av_frame_free(&frame);

video/image_writer.c

@@ -314,6 +314,7 @@ int image_writer_format_from_ext(const char *ext)
 
 static struct mp_image *convert_image(struct mp_image *image, int destfmt,
                                       enum mp_csp_levels yuv_levels,
+                                      struct mpv_global *global,
                                       struct mp_log *log)
 {
     int d_w, d_h;
@@ -350,7 +351,14 @@ static struct mp_image *convert_image(struct mp_image *image, int destfmt,
 
     dst->params = p;
 
-    if (mp_image_swscale(dst, image, mp_sws_hq_flags) < 0) {
+    struct mp_sws_context *sws = mp_sws_alloc(NULL);
+    sws->log = log;
+    if (global)
+        mp_sws_enable_cmdline_opts(sws, global);
+    bool ok = mp_sws_scale(sws, dst, image) >= 0;
+    talloc_free(sws);
+
+    if (!ok) {
         mp_err(log, "Error when converting image.\n");
         talloc_free(dst);
         return NULL;
@@ -360,7 +368,8 @@ static struct mp_image *convert_image(struct mp_image *image, int destfmt,
 }
 
 bool write_image(struct mp_image *image, const struct image_writer_opts *opts,
-                const char *filename, struct mp_log *log)
+                const char *filename, struct mpv_global *global,
+                 struct mp_log *log)
 {
     struct image_writer_opts defs = image_writer_opts_defaults;
     if (!opts)
@@ -393,7 +402,7 @@ bool write_image(struct mp_image *image, const struct image_writer_opts *opts,
         levels = MP_CSP_LEVELS_PC;
     }
 
-    struct mp_image *dst = convert_image(image, destfmt, levels, log);
+    struct mp_image *dst = convert_image(image, destfmt, levels, global, log);
     if (!dst)
         return false;
 
@@ -416,5 +425,5 @@ void dump_png(struct mp_image *image, const char *filename, struct mp_log *log)
 {
     struct image_writer_opts opts = image_writer_opts_defaults;
     opts.format = AV_CODEC_ID_PNG;
-    write_image(image, &opts, filename, log);
+    write_image(image, &opts, filename, NULL, log);
 }

video/image_writer.h

@@ -57,12 +57,15 @@ int image_writer_format_from_ext(const char *ext);
  *
  * File format and compression settings are controlled via the opts parameter.
  *
+ * If global!=NULL, use command line scaler options etc.
+ *
  * NOTE: The fields w/h/width/height of the passed mp_image must be all set
  *       accordingly. Setting w and width or h and height to different values
  *       can be used to store snapshots of anamorphic video.
  */
 bool write_image(struct mp_image *image, const struct image_writer_opts *opts,
-                 const char *filename, struct mp_log *log);
+                const char *filename, struct mpv_global *global,
+                 struct mp_log *log);
 
 // Debugging helper.
 void dump_png(struct mp_image *image, const char *filename, struct mp_log *log);

video/out/vo_image.c

@@ -120,7 +120,7 @@ static void flip_page(struct vo *vo)
         filename = mp_path_join(t, p->opts->outdir, filename);
 
     MP_INFO(vo, "Saving %s\n", filename);
-    write_image(p->current, p->opts->opts, filename, vo->log);
+    write_image(p->current, p->opts->opts, filename, vo->global, vo->log);
 
     talloc_free(t);
     mp_image_unrefp(&p->current);