sws: add dither enum

This allows specifying more dither algorithms without using up flags and
without ambiguities.

Also initialize the new field based on the flags and use it.
Note, improving the logic of the checks is left to subsequent
commits, this here only switches from flags to enum.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 10 insertions, 0 deletions

diff --git a/libswscale/swscale_internal.h b/libswscale/swscale_internal.h
index 18563eed78..bd5628d081 100644
--- a/libswscale/swscale_internal.h
+++ b/libswscale/swscale_internal.h
@@ -61,6 +61,14 @@
 
 struct SwsContext;
 
+typedef enum SwsDither {
+    SWS_DITHER_NONE = 0,
+    SWS_DITHER_AUTO,
+    SWS_DITHER_BAYER,
+    SWS_DITHER_ED,
+    NB_SWS_DITHER,
+} SwsDither;
+
 typedef int (*SwsFunc)(struct SwsContext *context, const uint8_t *src[],
                        int srcStride[], int srcSliceY, int srcSliceH,
                        uint8_t *dst[], int dstStride[]);
@@ -593,6 +601,8 @@ typedef struct SwsContext {
     void (*chrConvertRange)(int16_t *dst1, int16_t *dst2, int width);
 
     int needs_hcscale; ///< Set if there are chroma planes to be converted.
+
+    SwsDither dither;
 } SwsContext;
 //FIXME check init (where 0)