Match documentation for transparency in BGR32 iff images.

libavcodec/iff.c

@@ -506,10 +506,15 @@ static int decode_frame_ilbm(AVCodecContext *avctx,
         }
     } else if (avctx->codec_tag == MKTAG('D','E','E','P')) {
         int raw_width = avctx->width * (av_get_bits_per_pixel(&av_pix_fmt_descriptors[avctx->pix_fmt]) >> 3);
+        int x;
         for(y = 0; y < avctx->height && buf < buf_end; y++ ) {
             uint8_t *row = &s->frame.data[0][y * s->frame.linesize[0]];
             memcpy(row, buf, FFMIN(raw_width, buf_end - buf));
             buf += raw_width;
+            if (avctx->pix_fmt == PIX_FMT_BGR32) {
+                for(x = 0; x < avctx->width; x++)
+                    row[4 * x + 3] = row[4 * x + 3] & 0xF0 | (row[4 * x + 3] >> 4);
+            }
         }
     } else if (avctx->codec_tag == MKTAG('I','L','B','M')) { // interleaved
         if (avctx->pix_fmt == PIX_FMT_PAL8 || avctx->pix_fmt == PIX_FMT_GRAY8) {