Merge remote-tracking branch 'cehoyos/master'

* cehoyos/master:
  Move the iconv test to the bottom of configure.
  Make 32bit zmbv colour-space opaque.
  Use uint8_t instead of uint16_t pointer in kega decoder.
  kgv1dec: Simplify kega decoding by using memcpy instead of loops

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

1 files changed, 10 insertions, 19 deletions

diff --git a/libavcodec/kgv1dec.c b/libavcodec/kgv1dec.c
index 008843c673..6b81095af9 100644
--- a/libavcodec/kgv1dec.c
+++ b/libavcodec/kgv1dec.c
@@ -50,7 +50,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
     const uint8_t *buf_end = buf + avpkt->size;
     KgvContext * const c = avctx->priv_data;
     int offsets[8];
-    uint16_t *out, *prev;
+    uint8_t *out, *prev;
     int outcnt = 0, maxcnt;
     int w, h, i, res;
 
@@ -75,9 +75,9 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
     c->cur.reference = 3;
     if ((res = ff_get_buffer(avctx, &c->cur)) < 0)
         return res;
-    out  = (uint16_t *) c->cur.data[0];
+    out  = c->cur.data[0];
     if (c->prev.data[0]) {
-        prev = (uint16_t *) c->prev.data[0];
+        prev = c->prev.data[0];
     } else {
         prev = NULL;
     }
@@ -90,11 +90,10 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
         buf += 2;
 
         if (!(code & 0x8000)) {
-            out[outcnt++] = code; // rgb555 pixel coded directly
+            AV_WN16A(&out[2 * outcnt], code); // rgb555 pixel coded directly
+            outcnt++;
         } else {
             int count;
-            int inp_off;
-            uint16_t *inp;
 
             if ((code & 0x6000) == 0x6000) {
                 // copy from previous frame
@@ -112,7 +111,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
 
                 start = (outcnt + offsets[oidx]) % maxcnt;
 
-                if (maxcnt - start < count)
+                if (maxcnt - start < count || maxcnt - outcnt < count)
                     break;
 
                 if (!prev) {
@@ -121,8 +120,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
                     break;
                 }
 
-                inp = prev;
-                inp_off = start;
+                memcpy(out + 2 * outcnt, prev + 2 * start, 2 * count);
             } else {
                 // copy from earlier in this frame
                 int offset = (code & 0x1FFF) + 1;
@@ -137,19 +135,12 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
                     count = 4 + *buf++;
                 }
 
-                if (outcnt < offset)
+                if (outcnt < offset || maxcnt - outcnt < count)
                     break;
 
-                inp = out;
-                inp_off = outcnt - offset;
-            }
-
-            if (maxcnt - outcnt < count)
-                break;
-
-            for (i = inp_off; i < count + inp_off; i++) {
-                out[outcnt++] = inp[i];
+                av_memcpy_backptr(out + 2 * outcnt, 2 * offset, 2 * count);
             }
+            outcnt += count;
         }
     }