Change #272239

Comments

swscale/ops: keep track of copied/cleared components
These represent components which have not (yet) been modified from their
input values (i.e. after a read, or clear). Such components can be
basically passed through via a refcopy (where applicable), as well as helping
to distinguish dissimilar types of plane for (plane splitting).

Generates benign diffs like:

 gray 16x16 -> yuv444p 16x16:
-  [ u8 +XXX] SWS_OP_READ         : 1 elem(s) planar >> 0
+  [ u8 =XXX] SWS_OP_READ         : 1 elem(s) planar >> 0
     min: {0 _ _ _}, max: {255 _ _ _}
-  [ u8 +XXX] SWS_OP_CONVERT      : u8 -> f32
+  [ u8 =XXX] SWS_OP_CONVERT      : u8 -> f32
     min: {0 _ _ _}, max: {255 _ _ _}
   [f32 .XXX] SWS_OP_LINEAR       : luma [[73/85 0 0 0 16] [0 1 0 0 0] [0 0 1 0 0] [0 0 0 1 0]]
     min: {16 _ _ _}, max: {235 _ _ _}
   [f32 .XXX] SWS_OP_DITHER       : 16x16 matrix + {0 -1 -1 -1}
     min: {16.001953 _ _ _}, max: {235.998047 _ _ _}
   [f32 +XXX] SWS_OP_CONVERT      : f32 -> u8
     min: {16 _ _ _}, max: {235 _ _ _}
-  [ u8 +++X] SWS_OP_CLEAR        : {_ 128 128 _}
+  [ u8 +$$X] SWS_OP_CLEAR        : {_ 128 128 _}
     min: {16 128 128 _}, max: {235 128 128 _}
   [ u8 XXXX] SWS_OP_WRITE        : 3 elem(s) planar >> 0
-    (X = unused, z = byteswapped, + = exact, 0 = zero)
+    ('X' unused, 'z' byteswapped, '=' copied, '$' const, '+' integer, '0' zero)
  translated micro-ops:
     u8_read_planar_x
     u8_to_f32_x
     f32_linear_x_x000x
     f32_dither_x_0_16x16
     f32_to_u8_x
     u8_clear_yz_xx
     u8_write_planar_xyz

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Niklas Haas <git@haasn.dev>

Changed files

• libswscale/ops.c
• libswscale/ops.h
• tests/ref/fate/sws-ops-list