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-rw-r--r--libavcodec/dds.c85
1 files changed, 66 insertions, 19 deletions
diff --git a/libavcodec/dds.c b/libavcodec/dds.c
index 91e0c24226..fa0f34d7e7 100644
--- a/libavcodec/dds.c
+++ b/libavcodec/dds.c
@@ -2,20 +2,20 @@
* DirectDraw Surface image decoder
* Copyright (C) 2015 Vittorio Giovara <vittorio.giovara@gmail.com>
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * FFmpeg 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,
+ * FFmpeg 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
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
@@ -28,6 +28,7 @@
#include <stdint.h>
+#include "libavutil/libm.h"
#include "libavutil/imgutils.h"
#include "avcodec.h"
@@ -45,6 +46,7 @@ enum DDSPostProc {
DDS_ALPHA_EXP,
DDS_NORMAL_MAP,
DDS_RAW_YCOCG,
+ DDS_SWAP_ALPHA,
DDS_SWIZZLE_A2XY,
DDS_SWIZZLE_RBXG,
DDS_SWIZZLE_RGXB,
@@ -100,6 +102,7 @@ typedef struct DDSContext {
int compressed;
int paletted;
+ int bpp;
enum DDSPostProc postproc;
const uint8_t *tex_data; // Compressed texture
@@ -146,7 +149,7 @@ static int parse_pixel_format(AVCodecContext *avctx)
ctx->paletted = 0;
}
- bpp = bytestream2_get_le32(gbc); // rgbbitcount
+ bpp = ctx->bpp = bytestream2_get_le32(gbc); // rgbbitcount
r = bytestream2_get_le32(gbc); // rbitmask
g = bytestream2_get_le32(gbc); // gbitmask
b = bytestream2_get_le32(gbc); // bbitmask
@@ -352,14 +355,21 @@ static int parse_pixel_format(AVCodecContext *avctx)
return AVERROR_INVALIDDATA;
}
} else {
+ /* 4 bpp */
+ if (bpp == 4 && r == 0 && g == 0 && b == 0 && a == 0)
+ avctx->pix_fmt = AV_PIX_FMT_PAL8;
/* 8 bpp */
- if (bpp == 8 && r == 0xff && g == 0 && b == 0 && a == 0)
+ else if (bpp == 8 && r == 0xff && g == 0 && b == 0 && a == 0)
avctx->pix_fmt = AV_PIX_FMT_GRAY8;
else if (bpp == 8 && r == 0 && g == 0 && b == 0 && a == 0xff)
avctx->pix_fmt = AV_PIX_FMT_GRAY8;
/* 16 bpp */
else if (bpp == 16 && r == 0xff && g == 0 && b == 0 && a == 0xff00)
avctx->pix_fmt = AV_PIX_FMT_YA8;
+ else if (bpp == 16 && r == 0xff00 && g == 0 && b == 0 && a == 0xff) {
+ avctx->pix_fmt = AV_PIX_FMT_YA8;
+ ctx->postproc = DDS_SWAP_ALPHA;
+ }
else if (bpp == 16 && r == 0xffff && g == 0 && b == 0 && a == 0)
avctx->pix_fmt = AV_PIX_FMT_GRAY16LE;
else if (bpp == 16 && r == 0x7c00 && g == 0x3e0 && b == 0x1f && a == 0)
@@ -373,9 +383,9 @@ static int parse_pixel_format(AVCodecContext *avctx)
avctx->pix_fmt = AV_PIX_FMT_BGR24;
/* 32 bpp */
else if (bpp == 32 && r == 0xff0000 && g == 0xff00 && b == 0xff && a == 0)
- avctx->pix_fmt = AV_PIX_FMT_BGRA; // opaque
+ avctx->pix_fmt = AV_PIX_FMT_BGR0; // opaque
else if (bpp == 32 && r == 0xff && g == 0xff00 && b == 0xff0000 && a == 0)
- avctx->pix_fmt = AV_PIX_FMT_RGBA; // opaque
+ avctx->pix_fmt = AV_PIX_FMT_RGB0; // opaque
else if (bpp == 32 && r == 0xff0000 && g == 0xff00 && b == 0xff && a == 0xff000000)
avctx->pix_fmt = AV_PIX_FMT_BGRA;
else if (bpp == 32 && r == 0xff && g == 0xff00 && b == 0xff0000 && a == 0xff000000)
@@ -515,7 +525,7 @@ static void run_postproc(AVCodecContext *avctx, AVFrame *frame)
int d = (255 * 255 - x * x - y * y) / 2;
if (d > 0)
- z = rint(sqrtf(d));
+ z = lrint(sqrtf(d));
src[0] = x;
src[1] = y;
@@ -541,6 +551,15 @@ static void run_postproc(AVCodecContext *avctx, AVFrame *frame)
src[3] = a;
}
break;
+ case DDS_SWAP_ALPHA:
+ /* Alpha and Luma are stored swapped. */
+ av_log(avctx, AV_LOG_DEBUG, "Post-processing swapped Luma/Alpha.\n");
+
+ for (i = 0; i < frame->linesize[0] * frame->height; i += 2) {
+ uint8_t *src = frame->data[0] + i;
+ FFSWAP(uint8_t, src[0], src[1]);
+ }
+ break;
case DDS_SWIZZLE_A2XY:
/* Swap R and G, often used to restore a standard RGTC2. */
av_log(avctx, AV_LOG_DEBUG, "Post-processing A2XY swizzle.\n");
@@ -661,22 +680,50 @@ static int dds_decode(AVCodecContext *avctx, void *data,
/* Use the decompress function on the texture, one block per thread. */
ctx->tex_data = gbc->buffer;
avctx->execute2(avctx, decompress_texture_thread, frame, NULL, ctx->slice_count);
+ } else if (!ctx->paletted && ctx->bpp == 4 && avctx->pix_fmt == AV_PIX_FMT_PAL8) {
+ uint8_t *dst = frame->data[0];
+ int x, y, i;
+
+ /* Use the first 64 bytes as palette, then copy the rest. */
+ bytestream2_get_buffer(gbc, frame->data[1], 16 * 4);
+ for (i = 0; i < 16; i++) {
+ AV_WN32(frame->data[1] + i*4,
+ (frame->data[1][2+i*4]<<0)+
+ (frame->data[1][1+i*4]<<8)+
+ (frame->data[1][0+i*4]<<16)+
+ (frame->data[1][3+i*4]<<24)
+ );
+ }
+ frame->palette_has_changed = 1;
+
+ if (bytestream2_get_bytes_left(gbc) < frame->height * frame->width / 2) {
+ av_log(avctx, AV_LOG_ERROR, "Buffer is too small (%d < %d).\n",
+ bytestream2_get_bytes_left(gbc), frame->height * frame->width / 2);
+ return AVERROR_INVALIDDATA;
+ }
+
+ for (y = 0; y < frame->height; y++) {
+ for (x = 0; x < frame->width; x += 2) {
+ uint8_t val = bytestream2_get_byte(gbc);
+ dst[x ] = val & 0xF;
+ dst[x + 1] = val >> 4;
+ }
+ dst += frame->linesize[0];
+ }
} else {
int linesize = av_image_get_linesize(avctx->pix_fmt, frame->width, 0);
if (ctx->paletted) {
int i;
- uint32_t *p = (uint32_t*) frame->data[1];
-
/* Use the first 1024 bytes as palette, then copy the rest. */
- for (i = 0; i < 256; i++) {
- uint32_t rgba = 0;
- rgba |= bytestream2_get_byte(gbc) << 16;
- rgba |= bytestream2_get_byte(gbc) << 8;
- rgba |= bytestream2_get_byte(gbc) << 0;
- rgba |= bytestream2_get_byte(gbc) << 24;
- p[i] = rgba;
- }
+ bytestream2_get_buffer(gbc, frame->data[1], 256 * 4);
+ for (i = 0; i < 256; i++)
+ AV_WN32(frame->data[1] + i*4,
+ (frame->data[1][2+i*4]<<0)+
+ (frame->data[1][1+i*4]<<8)+
+ (frame->data[1][0+i*4]<<16)+
+ (frame->data[1][3+i*4]<<24)
+ );
frame->palette_has_changed = 1;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-13 15:26:58 +0000