@@ -531,6 +531,26 @@ static inline uint8_t ana_convert(const int *coeff, const uint8_t *left, const u

     return av_clip_uint8(sum >> 16);

 }

+static void anaglyph(uint8_t *dst, uint8_t *lsrc, uint8_t *rsrc,

+                     ptrdiff_t dst_linesize, ptrdiff_t l_linesize, ptrdiff_t r_linesize,

+                     int width, int height,

+                     const int *ana_matrix_r, const int *ana_matrix_g, const int *ana_matrix_b)

+{

+    int x, y, o;

+

+    for (y = 0; y < height; y++) {

+        for (o = 0, x = 0; x < width; x++, o+= 3) {

+            dst[o    ] = ana_convert(ana_matrix_r, lsrc + o, rsrc + o);

+            dst[o + 1] = ana_convert(ana_matrix_g, lsrc + o, rsrc + o);

+            dst[o + 2] = ana_convert(ana_matrix_b, lsrc + o, rsrc + o);

+        }

+

+        dst  += dst_linesize;

+        lsrc += l_linesize;

+        rsrc += r_linesize;

+    }

+}

+

 typedef struct ThreadData {

     AVFrame *ileft, *iright;

     AVFrame *out;

@@ -546,23 +566,16 @@ static int filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)

     int height = s->out.height;

     int start = (height *  jobnr   ) / nb_jobs;

     int end   = (height * (jobnr+1)) / nb_jobs;

-    uint8_t *dst = out->data[0];

     const int **ana_matrix = s->ana_matrix;

-    int x, y, il, ir, o;

-    const uint8_t *lsrc = ileft->data[0];

-    const uint8_t *rsrc = iright->data[0];

-    int out_width = s->out.width;

-

-    for (y = start; y < end; y++) {

-        o   = out->linesize[0] * y;

-        il  = s->in_off_left[0]  + y * ileft->linesize[0] * s->in.row_step;

-        ir  = s->in_off_right[0] + y * iright->linesize[0] * s->in.row_step;

-        for (x = 0; x < out_width; x++, il += 3, ir += 3, o+= 3) {

-            dst[o    ] = ana_convert(ana_matrix[0], lsrc + il, rsrc + ir);

-            dst[o + 1] = ana_convert(ana_matrix[1], lsrc + il, rsrc + ir);

-            dst[o + 2] = ana_convert(ana_matrix[2], lsrc + il, rsrc + ir);

-        }

-    }

+

+    anaglyph(out->data[0] + out->linesize[0] * start,

+             ileft ->data[0] + s->in_off_left [0]  + ileft->linesize[0] * start * s->in.row_step,

+             iright->data[0] + s->in_off_right[0] + iright->linesize[0] * start * s->in.row_step,

+             out->linesize[0],

+             ileft->linesize[0] * s->in.row_step,

+             iright->linesize[0] * s->in.row_step,

+             s->out.width, end - start,

+             ana_matrix[0], ana_matrix[1], ana_matrix[2]);

     return 0;

 }