[FFmpeg-cvslog] swscale/utils: Detect and skip unneeded sws_setColorspaceDetails() calls

[Michael Niedermayer]

ffmpeg | branch: release/2.8 | Michael Niedermayer <michael at niedermayer.cc> | Thu Jan 14 15:11:48 2016 +0100| [cdac68fbab6923a71431709c2109bd60d0f90bbd] | committer: Michael Niedermayer

swscale/utils: Detect and skip unneeded sws_setColorspaceDetails() calls

This avoids running various table inits unnecessarily

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit cc538e9dbd14b61d1ac8c9fa687d83289673fe90)

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=cdac68fbab6923a71431709c2109bd60d0f90bbd
---

 libswscale/utils.c |   22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/libswscale/utils.c b/libswscale/utils.c
index a108d99..37820f6 100644
--- a/libswscale/utils.c
+++ b/libswscale/utils.c
@@ -830,8 +830,6 @@ int sws_setColorspaceDetails(struct SwsContext *c, const int inv_table[4],
     const AVPixFmtDescriptor *desc_dst;
     const AVPixFmtDescriptor *desc_src;
     int need_reinit = 0;
-    memmove(c->srcColorspaceTable, inv_table, sizeof(int) * 4);
-    memmove(c->dstColorspaceTable, table, sizeof(int) * 4);
 
     handle_formats(c);
     desc_dst = av_pix_fmt_desc_get(c->dstFormat);
@@ -842,11 +840,24 @@ int sws_setColorspaceDetails(struct SwsContext *c, const int inv_table[4],
     if(!isYUV(c->srcFormat) && !isGray(c->srcFormat))
         srcRange = 0;
 
+    if (c->srcRange != srcRange ||
+        c->dstRange != dstRange ||
+        c->brightness != brightness ||
+        c->contrast   != contrast ||
+        c->saturation != saturation ||
+        memcmp(c->srcColorspaceTable, inv_table, sizeof(int) * 4) ||
+        memcmp(c->dstColorspaceTable,     table, sizeof(int) * 4)
+    )
+        need_reinit = 1;
+
+    memmove(c->srcColorspaceTable, inv_table, sizeof(int) * 4);
+    memmove(c->dstColorspaceTable, table, sizeof(int) * 4);
+
+
+
     c->brightness = brightness;
     c->contrast   = contrast;
     c->saturation = saturation;
-    if (c->srcRange != srcRange || c->dstRange != dstRange)
-        need_reinit = 1;
     c->srcRange   = srcRange;
     c->dstRange   = dstRange;
 
@@ -861,6 +872,9 @@ int sws_setColorspaceDetails(struct SwsContext *c, const int inv_table[4],
     if (c->cascaded_context[0])
         return sws_setColorspaceDetails(c->cascaded_context[0],inv_table, srcRange,table, dstRange, brightness,  contrast, saturation);
 
+    if (!need_reinit)
+        return 0;
+
     if ((isYUV(c->dstFormat) || isGray(c->dstFormat)) && (isYUV(c->srcFormat) || isGray(c->srcFormat))) {
         if (!c->cascaded_context[0] &&
             memcmp(c->dstColorspaceTable, c->srcColorspaceTable, sizeof(int) * 4) &&