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>

4 files changed, 29 insertions, 159 deletions

diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 1d34e2fd2d..26f1c072b1 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -404,7 +404,7 @@ OBJS-$(CONFIG_TSCC_DECODER)            += tscc.o msrledec.o
 OBJS-$(CONFIG_TSCC2_DECODER)           += tscc2.o
 OBJS-$(CONFIG_TTA_DECODER)             += tta.o
 OBJS-$(CONFIG_TWINVQ_DECODER)          += twinvqdec.o twinvq.o
-OBJS-$(CONFIG_TXD_DECODER)             += txd.o s3tc.o
+OBJS-$(CONFIG_TXD_DECODER)             += txd.o
 OBJS-$(CONFIG_ULTI_DECODER)            += ulti.o
 OBJS-$(CONFIG_UTVIDEO_DECODER)         += utvideodec.o utvideo.o
 OBJS-$(CONFIG_UTVIDEO_ENCODER)         += utvideoenc.o utvideo.o
diff --git a/libavcodec/s3tc.c b/libavcodec/s3tc.c
deleted file mode 100644
index d35cf2ac07..0000000000
--- a/libavcodec/s3tc.c
+++ /dev/null
@@ -1,97 +0,0 @@
-/*
- * S3 Texture Compression (S3TC) decoding functions
- * Copyright (c) 2007 by Ivo van Poorten
- *
- * see also: http://wiki.multimedia.cx/index.php?title=S3TC
- *
- * This file is part of Libav.
- *
- * Libav is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * Libav is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with Libav; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include "avcodec.h"
-#include "bytestream.h"
-#include "s3tc.h"
-
-static inline void dxt1_decode_pixels(GetByteContext *gb, uint32_t *d,
-                                      unsigned int qstride, unsigned int flag,
-                                      uint64_t alpha) {
-    unsigned int x, y, c0, c1, a = (!flag * 255u) << 24;
-    unsigned int rb0, rb1, rb2, rb3, g0, g1, g2, g3;
-    uint32_t colors[4], pixels;
-
-    c0 = bytestream2_get_le16(gb);
-    c1 = bytestream2_get_le16(gb);
-
-    rb0  = (c0<<3 | c0<<8) & 0xf800f8;
-    rb1  = (c1<<3 | c1<<8) & 0xf800f8;
-    rb0 +=        (rb0>>5) & 0x070007;
-    rb1 +=        (rb1>>5) & 0x070007;
-    g0   =        (c0 <<5) & 0x00fc00;
-    g1   =        (c1 <<5) & 0x00fc00;
-    g0  +=        (g0 >>6) & 0x000300;
-    g1  +=        (g1 >>6) & 0x000300;
-
-    colors[0] = rb0 + g0 + a;
-    colors[1] = rb1 + g1 + a;
-
-    if (c0 > c1 || flag) {
-        rb2 = (((2*rb0+rb1) * 21) >> 6) & 0xff00ff;
-        rb3 = (((2*rb1+rb0) * 21) >> 6) & 0xff00ff;
-        g2  = (((2*g0 +g1 ) * 21) >> 6) & 0x00ff00;
-        g3  = (((2*g1 +g0 ) * 21) >> 6) & 0x00ff00;
-        colors[3] = rb3 + g3 + a;
-    } else {
-        rb2 = ((rb0+rb1) >> 1) & 0xff00ff;
-        g2  = ((g0 +g1 ) >> 1) & 0x00ff00;
-        colors[3] = 0;
-    }
-
-    colors[2] = rb2 + g2 + a;
-
-    pixels = bytestream2_get_le32(gb);
-    for (y=0; y<4; y++) {
-        for (x=0; x<4; x++) {
-            a        = (alpha & 0x0f) << 28;
-            a       += a >> 4;
-            d[x]     = a + colors[pixels&3];
-            pixels >>= 2;
-            alpha  >>= 4;
-        }
-        d += qstride;
-    }
-}
-
-void ff_decode_dxt1(GetByteContext *gb, uint8_t *dst,
-                    const unsigned int w, const unsigned int h,
-                    const unsigned int stride) {
-    unsigned int bx, by, qstride = stride/4;
-    uint32_t *d = (uint32_t *) dst;
-
-    for (by=0; by < h/4; by++, d += stride-w)
-        for (bx = 0; bx < w / 4; bx++, d += 4)
-            dxt1_decode_pixels(gb, d, qstride, 0, 0LL);
-}
-
-void ff_decode_dxt3(GetByteContext *gb, uint8_t *dst,
-                    const unsigned int w, const unsigned int h,
-                    const unsigned int stride) {
-    unsigned int bx, by, qstride = stride/4;
-    uint32_t *d = (uint32_t *) dst;
-
-    for (by=0; by < h/4; by++, d += stride-w)
-        for (bx = 0; bx < w / 4; bx++, d += 4)
-            dxt1_decode_pixels(gb, d, qstride, 1, bytestream2_get_le64(gb));
-}
diff --git a/libavcodec/s3tc.h b/libavcodec/s3tc.h
deleted file mode 100644
index 25237b95bd..0000000000
--- a/libavcodec/s3tc.h
+++ /dev/null
@@ -1,55 +0,0 @@
-/*
- * S3 Texture Compression (S3TC) decoding functions
- * Copyright (c) 2007 by Ivo van Poorten
- *
- * This file is part of Libav.
- *
- * Libav is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * Libav is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with Libav; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#ifndef AVCODEC_S3TC_H
-#define AVCODEC_S3TC_H
-
-#include <stdint.h>
-
-#include "bytestream.h"
-
-#define FF_S3TC_DXT1    0x31545844
-#define FF_S3TC_DXT3    0x33545844
-
-/**
- * Decode DXT1 encoded data to RGB32
- * @param gb GetByteContext
- * @param dst destination buffer
- * @param w width of output image
- * @param h height of output image
- * @param stride line size of output image
- */
-void ff_decode_dxt1(GetByteContext *gb, uint8_t *dst,
-                    const unsigned int w, const unsigned int h,
-                    const unsigned int stride);
-/**
- * Decode DXT3 encoded data to RGB32
- * @param gb GetByteContext
- * @param dst destination buffer
- * @param w width of output image
- * @param h height of output image
- * @param stride line size of output image
- */
-void ff_decode_dxt3(GetByteContext *gb, uint8_t *dst,
-                    const unsigned int w, const unsigned int h,
-                    const unsigned int stride);
-
-#endif /* AVCODEC_S3TC_H */
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;