image_writer: remove useless formats

Nobody cares about those.

DOCS/interface-changes.rst

@@ -22,6 +22,8 @@ Interface changes
  --- mpv 0.25.0 ---
     - remove opengl-cb dxva2 dummy hwdec interop
       (see git "vo_opengl: remove dxva2 dummy hwdec backend")
+    - remove ppm, pgm, pgmyuv, tga choices from the --screenshot-format and
+      --vo-image-format options
  --- mpv 0.24.0 ---
     - deprecate --hwdec-api and replace it with --opengl-hwdec-interop.
       The new option accepts both --hwdec values, as well as named backends.

DOCS/man/options.rst

@@ -3107,10 +3107,6 @@ Screenshot
     Available choices:
 
     :png:       PNG
-    :ppm:       PPM
-    :pgm:       PGM
-    :pgmyuv:    PGM with YV12 pixel format
-    :tga:       TARGA
     :jpg:       JPEG (default)
     :jpeg:      JPEG (same as jpg, but with .jpeg file ending)
 

DOCS/man/vo.rst

@@ -418,14 +418,6 @@ Available video output drivers are:
             JPEG files, extension .jpeg.
         png
             PNG files.
-        ppm
-            Portable bitmap format.
-        pgm
-            Portable graymap format.
-        pgmyuv
-            Portable graymap format, using the YV12 pixel format.
-        tga
-            Truevision TGA.
 
     ``--vo-image-png-compression=<0-9>``
         PNG compression factor (speed vs. file size tradeoff) (default: 7)

video/image_writer.c

@@ -261,10 +261,6 @@ unknown:
 
 static const struct img_writer img_writers[] = {
     { "png", write_lavc, .lavc_codec = AV_CODEC_ID_PNG },
-    { "ppm", write_lavc, .lavc_codec = AV_CODEC_ID_PPM },
-    { "pgm", write_lavc, .lavc_codec = AV_CODEC_ID_PGM },
-    { "pgmyuv", write_lavc, .lavc_codec = AV_CODEC_ID_PGMYUV },
-    { "tga", write_lavc, .lavc_codec = AV_CODEC_ID_TARGA },
 #if HAVE_JPEG
     { "jpg", write_jpeg },
     { "jpeg", write_jpeg },