/*

 * Renderware TeXture Dictionary (.txd) image decoder

 * Copyright (c) 2007 Ivo van Poorten

 *

 * See also: http://wiki.multimedia.cx/index.php?title=TXD

 *

 * This file is part of FFmpeg.

 *

 * 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.

 *

 * 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 FFmpeg; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

#include "bytestream.h"

#include "avcodec.h"

#include "codec_internal.h"

#include "decode.h"

#include "texturedsp.h"

#define TXD_DXT1 0x31545844

#define TXD_DXT3 0x33545844

static int txd_decode_frame(AVCodecContext *avctx, AVFrame *p,

                            int *got_frame, AVPacket *avpkt)

{

    GetByteContext gb;

    TextureDSPContext dxtc;

    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;

    if (avpkt->size < 88)

        return AVERROR_INVALIDDATA;

    ff_texturedsp_init(&dxtc);

    bytestream2_init(&gb, avpkt->data, avpkt->size);

    version         = bytestream2_get_le32(&gb);

    bytestream2_skip(&gb, 72);

    d3d_format      = bytestream2_get_le32(&gb);

    w               = bytestream2_get_le16(&gb);

    h               = bytestream2_get_le16(&gb);

    depth           = bytestream2_get_byte(&gb);

    bytestream2_skip(&gb, 2);

    flags           = bytestream2_get_byte(&gb);

    if (version < 8 || version > 9) {

        avpriv_report_missing_feature(avctx, "Texture data version %u", version);

        return AVERROR_PATCHWELCOME;

    }

    if (depth == 8) {

        avctx->pix_fmt = AV_PIX_FMT_PAL8;

        if (bytestream2_get_bytes_left(&gb) < w * h + 4 * 256)

            return AVERROR_INVALIDDATA;

    } else if (depth == 16) {

        avctx->pix_fmt = AV_PIX_FMT_RGBA;

        switch (d3d_format) {

        case 0:

            if (!(flags & 1))

                goto unsupported;

        case TXD_DXT1:

            if (bytestream2_get_bytes_left(&gb) < AV_CEIL_RSHIFT(w, 2) * AV_CEIL_RSHIFT(h, 2) * 8 + 4)

                return AVERROR_INVALIDDATA;

            break;

        case TXD_DXT3:

            if (bytestream2_get_bytes_left(&gb) < AV_CEIL_RSHIFT(w, 2) * AV_CEIL_RSHIFT(h, 2) * 16 + 4)

                return AVERROR_INVALIDDATA;

        }

    } else if (depth == 32) {

        avctx->pix_fmt = AV_PIX_FMT_RGBA;

        if (bytestream2_get_bytes_left(&gb) < h * w * 4)

            return AVERROR_INVALIDDATA;

    } else {

        avpriv_report_missing_feature(avctx, "Color depth of %u", depth);

        return AVERROR_PATCHWELCOME;

    }

    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)

        return ret;

    p->pict_type = AV_PICTURE_TYPE_I;

    ptr    = p->data[0];

    stride = p->linesize[0];

    if (depth == 8) {

        pal = (uint32_t *) p->data[1];

        for (y = 0; y < 256; y++) {

            v = bytestream2_get_be32(&gb);

            pal[y] = (v >> 8) + (v << 24);

        }

        bytestream2_skip(&gb, 4);

        for (y=0; y<h; y++) {

            bytestream2_get_buffer(&gb, ptr, w);

            ptr += stride;

        }

    } else if (depth == 16) {

        bytestream2_skip(&gb, 4);

        switch (d3d_format) {

        case 0:

        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 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;

        }

    } else if (depth == 32) {

        switch (d3d_format) {

        case 0x15:

        case 0x16:

            for (y=0; y<h; y++) {

                bytestream2_get_buffer(&gb, ptr, w * 4);

                ptr += stride;

            }

            break;

        default:

            goto unsupported;

        }

    }

    *got_frame = 1;

    return avpkt->size;

unsupported:

    avpriv_report_missing_feature(avctx, "d3d format (%08x)", d3d_format);

    return AVERROR_PATCHWELCOME;

}

const FFCodec ff_txd_decoder = {

    .p.name         = "txd",

    CODEC_LONG_NAME("Renderware TXD (TeXture Dictionary) image"),

    .p.type         = AVMEDIA_TYPE_VIDEO,

    .p.id           = AV_CODEC_ID_TXD,

    .p.capabilities = AV_CODEC_CAP_DR1,

    FF_CODEC_DECODE_CB(txd_decode_frame),

};