shithub: jbig2

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jbig2dec: Use corresponding stride for gray-scale bitplane.

All bitplanes have the same stride, but this change makes it obvious
that we will not overwrite any boundaries (i.e. use the stride of the
bitplane in question, not the stride for another bitplane).

--- a/jbig2_halftone.c

+++ b/jbig2_halftone.c

@@ -349,7 +349,7 @@

         /* C.5 step 3. (b):

          * for each [x,y]

          * GSPLANES[j][x][y] = GSPLANES[j+1][x][y] XOR GSPLANES[j][x][y] */

-        stride = GSPLANES[0]->stride;

+        stride = GSPLANES[j]->stride;

         for (i = 0; i < stride * GSH; ++i)

             GSPLANES[j]->data[i] ^= GSPLANES[j + 1]->data[i];