From c0b105756f61d253bdabcc2bb49453a2557e7c3b Mon Sep 17 00:00:00 2001
From: Vittorio Giovara <vittorio.giovara@gmail.com>
Date: Tue, 19 May 2015 23:54:16 +0100
Subject: txd: Use the TextureDSP module for decoding

Using the internal DXTC routines brings support for non multiple of 4
textures. A new test is added to cover this feature. Hashes differ
since the decoding algorithm is different, though no visual changes
have been spotted.

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
---
 libavcodec/txd.c | 34 ++++++++++++++++++++++++++++------
 1 file changed, 28 insertions(+), 6 deletions(-)

(limited to 'libavcodec/txd.c')

diff --git a/libavcodec/txd.c b/libavcodec/txd.c
index 8f12291c85..058ab3ee38 100644
--- a/libavcodec/txd.c
+++ b/libavcodec/txd.c
@@ -26,18 +26,25 @@
 #include "avcodec.h"
 #include "bytestream.h"
 #include "internal.h"
-#include "s3tc.h"
+#include "texturedsp.h"
+
+#define TXD_DXT1 0x31545844
+#define TXD_DXT3 0x33545844
 
 static int txd_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
                             AVPacket *avpkt) {
     GetByteContext gb;
+    TextureDSPContext dxtc;
     AVFrame * const p = data;
     unsigned int version, w, h, d3d_format, depth, stride, flags;
     unsigned int y, v;
     uint8_t *ptr;
     uint32_t *pal;
+    int i, j;
     int ret;
 
+    ff_texturedsp_init(&dxtc);
+
     bytestream2_init(&gb, avpkt->data, avpkt->size);
     version         = bytestream2_get_le32(&gb);
     bytestream2_skip(&gb, 72);
@@ -57,7 +64,7 @@ static int txd_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
     if (depth == 8) {
         avctx->pix_fmt = AV_PIX_FMT_PAL8;
     } else if (depth == 16 || depth == 32) {
-        avctx->pix_fmt = AV_PIX_FMT_RGB32;
+        avctx->pix_fmt = AV_PIX_FMT_RGBA;
     } else {
         av_log(avctx, AV_LOG_ERROR, "depth of %i is unsupported\n", depth);
         return AVERROR_PATCHWELCOME;
@@ -66,6 +73,9 @@ static int txd_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
     if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
         return ret;
 
+    avctx->coded_width  = FFALIGN(w, 4);
+    avctx->coded_height = FFALIGN(h, 4);
+
     if ((ret = ff_get_buffer(avctx, p, 0)) < 0) {
         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
         return ret;
@@ -93,11 +103,23 @@ static int txd_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
         case 0:
             if (!(flags & 1))
                 goto unsupported;
-        case FF_S3TC_DXT1:
-            ff_decode_dxt1(&gb, ptr, w, h, stride);
+        case TXD_DXT1:
+            for (j = 0; j < avctx->height; j += 4) {
+                for (i = 0; i < avctx->width; i += 4) {
+                    uint8_t *p = ptr + i * 4 + j * stride;
+                    int step = dxtc.dxt1_block(p, stride, gb.buffer);
+                    bytestream2_skip(&gb, step);
+                }
+            }
             break;
-        case FF_S3TC_DXT3:
-            ff_decode_dxt3(&gb, ptr, w, h, stride);
+        case TXD_DXT3:
+            for (j = 0; j < avctx->height; j += 4) {
+                for (i = 0; i < avctx->width; i += 4) {
+                    uint8_t *p = ptr + i * 4 + j * stride;
+                    int step = dxtc.dxt3_block(p, stride, gb.buffer);
+                    bytestream2_skip(&gb, step);
+                }
+            }
             break;
         default:
             goto unsupported;
-- 
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