/*
  * XWD image format
  *
  * Copyright (c) 2012 Paul B Mahol
  *

  * 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 <inttypes.h>
 

 #include "libavutil/imgutils.h"
 #include "avcodec.h"
 #include "bytestream.h"

 #include "internal.h"

 #include "xwd.h"
 
 static int xwd_decode_frame(AVCodecContext *avctx, void *data,

                             int *got_frame, AVPacket *avpkt)

 {

     AVFrame *p = data;

     const uint8_t *buf = avpkt->data;
     int i, ret, buf_size = avpkt->size;
     uint32_t version, header_size, vclass, ncolors;
     uint32_t xoffset, be, bpp, lsize, rsize;
     uint32_t pixformat, pixdepth, bunit, bitorder, bpad;
     uint32_t rgb[3];
     uint8_t *ptr;

     int width, height;

     GetByteContext gb;

 
     if (buf_size < XWD_HEADER_SIZE)
         return AVERROR_INVALIDDATA;
 

     bytestream2_init(&gb, buf, buf_size);
     header_size = bytestream2_get_be32u(&gb);

     version = bytestream2_get_be32u(&gb);

     if (version != XWD_VERSION) {
         av_log(avctx, AV_LOG_ERROR, "unsupported version\n");
         return AVERROR_INVALIDDATA;
     }
 

     if (buf_size < header_size || header_size < XWD_HEADER_SIZE) {

         av_log(avctx, AV_LOG_ERROR, "invalid header size\n");
         return AVERROR_INVALIDDATA;
     }
 

     pixformat     = bytestream2_get_be32u(&gb);
     pixdepth      = bytestream2_get_be32u(&gb);

     width         = bytestream2_get_be32u(&gb);
     height        = bytestream2_get_be32u(&gb);

     xoffset       = bytestream2_get_be32u(&gb);
     be            = bytestream2_get_be32u(&gb);
     bunit         = bytestream2_get_be32u(&gb);
     bitorder      = bytestream2_get_be32u(&gb);
     bpad          = bytestream2_get_be32u(&gb);
     bpp           = bytestream2_get_be32u(&gb);
     lsize         = bytestream2_get_be32u(&gb);
     vclass        = bytestream2_get_be32u(&gb);
     rgb[0]        = bytestream2_get_be32u(&gb);
     rgb[1]        = bytestream2_get_be32u(&gb);
     rgb[2]        = bytestream2_get_be32u(&gb);
     bytestream2_skipu(&gb, 8);
     ncolors       = bytestream2_get_be32u(&gb);
     bytestream2_skipu(&gb, header_size - (XWD_HEADER_SIZE - 20));

     if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
         return ret;
 

     av_log(avctx, AV_LOG_DEBUG,
            "pixformat %"PRIu32", pixdepth %"PRIu32", bunit %"PRIu32", bitorder %"PRIu32", bpad %"PRIu32"\n",

            pixformat, pixdepth, bunit, bitorder, bpad);

     av_log(avctx, AV_LOG_DEBUG,
            "vclass %"PRIu32", ncolors %"PRIu32", bpp %"PRIu32", be %"PRIu32", lsize %"PRIu32", xoffset %"PRIu32"\n",

            vclass, ncolors, bpp, be, lsize, xoffset);

     av_log(avctx, AV_LOG_DEBUG,
            "red %0"PRIx32", green %0"PRIx32", blue %0"PRIx32"\n",
            rgb[0], rgb[1], rgb[2]);

 
     if (pixformat > XWD_Z_PIXMAP) {
         av_log(avctx, AV_LOG_ERROR, "invalid pixmap format\n");
         return AVERROR_INVALIDDATA;
     }
 
     if (pixdepth == 0 || pixdepth > 32) {
         av_log(avctx, AV_LOG_ERROR, "invalid pixmap depth\n");
         return AVERROR_INVALIDDATA;
     }
 
     if (xoffset) {

         avpriv_request_sample(avctx, "xoffset %"PRIu32"", xoffset);

         return AVERROR_PATCHWELCOME;
     }
 
     if (be > 1) {
         av_log(avctx, AV_LOG_ERROR, "invalid byte order\n");
         return AVERROR_INVALIDDATA;
     }
 
     if (bitorder > 1) {
         av_log(avctx, AV_LOG_ERROR, "invalid bitmap bit order\n");
         return AVERROR_INVALIDDATA;
     }
 
     if (bunit != 8 && bunit != 16 && bunit != 32) {
         av_log(avctx, AV_LOG_ERROR, "invalid bitmap unit\n");
         return AVERROR_INVALIDDATA;
     }
 
     if (bpad != 8 && bpad != 16 && bpad != 32) {
         av_log(avctx, AV_LOG_ERROR, "invalid bitmap scan-line pad\n");
         return AVERROR_INVALIDDATA;
     }
 
     if (bpp == 0 || bpp > 32) {
         av_log(avctx, AV_LOG_ERROR, "invalid bits per pixel\n");
         return AVERROR_INVALIDDATA;
     }
 
     if (ncolors > 256) {
         av_log(avctx, AV_LOG_ERROR, "invalid number of entries in colormap\n");
         return AVERROR_INVALIDDATA;
     }
 
     if ((ret = av_image_check_size(avctx->width, avctx->height, 0, NULL)) < 0)
         return ret;
 
     rsize = FFALIGN(avctx->width * bpp, bpad) / 8;
     if (lsize < rsize) {
         av_log(avctx, AV_LOG_ERROR, "invalid bytes per scan-line\n");
         return AVERROR_INVALIDDATA;
     }
 

     if (bytestream2_get_bytes_left(&gb) < ncolors * XWD_CMAP_SIZE + (uint64_t)avctx->height * lsize) {

         av_log(avctx, AV_LOG_ERROR, "input buffer too small\n");
         return AVERROR_INVALIDDATA;
     }
 
     if (pixformat != XWD_Z_PIXMAP) {

         avpriv_report_missing_feature(avctx, "Pixmap format %"PRIu32, pixformat);

         return AVERROR_PATCHWELCOME;
     }
 

     avctx->pix_fmt = AV_PIX_FMT_NONE;

     switch (vclass) {
     case XWD_STATIC_GRAY:
     case XWD_GRAY_SCALE:

         if (bpp != 1 && bpp != 8)

             return AVERROR_INVALIDDATA;

         if (bpp == 1 && pixdepth == 1) {

             avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;

         } else if (bpp == 8 && pixdepth == 8) {

             avctx->pix_fmt = AV_PIX_FMT_GRAY8;

         }

         break;
     case XWD_STATIC_COLOR:
     case XWD_PSEUDO_COLOR:
         if (bpp == 8)

             avctx->pix_fmt = AV_PIX_FMT_PAL8;

         break;
     case XWD_TRUE_COLOR:
     case XWD_DIRECT_COLOR:
         if (bpp != 16 && bpp != 24 && bpp != 32)
             return AVERROR_INVALIDDATA;
         if (bpp == 16 && pixdepth == 15) {
             if (rgb[0] == 0x7C00 && rgb[1] == 0x3E0 && rgb[2] == 0x1F)

                 avctx->pix_fmt = be ? AV_PIX_FMT_RGB555BE : AV_PIX_FMT_RGB555LE;

             else if (rgb[0] == 0x1F && rgb[1] == 0x3E0 && rgb[2] == 0x7C00)

                 avctx->pix_fmt = be ? AV_PIX_FMT_BGR555BE : AV_PIX_FMT_BGR555LE;

         } else if (bpp == 16 && pixdepth == 16) {
             if (rgb[0] == 0xF800 && rgb[1] == 0x7E0 && rgb[2] == 0x1F)

                 avctx->pix_fmt = be ? AV_PIX_FMT_RGB565BE : AV_PIX_FMT_RGB565LE;

             else if (rgb[0] == 0x1F && rgb[1] == 0x7E0 && rgb[2] == 0xF800)

                 avctx->pix_fmt = be ? AV_PIX_FMT_BGR565BE : AV_PIX_FMT_BGR565LE;

         } else if (bpp == 24) {
             if (rgb[0] == 0xFF0000 && rgb[1] == 0xFF00 && rgb[2] == 0xFF)

                 avctx->pix_fmt = be ? AV_PIX_FMT_RGB24 : AV_PIX_FMT_BGR24;

             else if (rgb[0] == 0xFF && rgb[1] == 0xFF00 && rgb[2] == 0xFF0000)

                 avctx->pix_fmt = be ? AV_PIX_FMT_BGR24 : AV_PIX_FMT_RGB24;

         } else if (bpp == 32) {
             if (rgb[0] == 0xFF0000 && rgb[1] == 0xFF00 && rgb[2] == 0xFF)

                 avctx->pix_fmt = be ? AV_PIX_FMT_ARGB : AV_PIX_FMT_BGRA;

             else if (rgb[0] == 0xFF && rgb[1] == 0xFF00 && rgb[2] == 0xFF0000)

                 avctx->pix_fmt = be ? AV_PIX_FMT_ABGR : AV_PIX_FMT_RGBA;

         }

         bytestream2_skipu(&gb, ncolors * XWD_CMAP_SIZE);

         break;
     default:
         av_log(avctx, AV_LOG_ERROR, "invalid visual class\n");
         return AVERROR_INVALIDDATA;
     }
 

     if (avctx->pix_fmt == AV_PIX_FMT_NONE) {

         avpriv_request_sample(avctx,

                               "Unknown file: bpp %"PRIu32", pixdepth %"PRIu32", vclass %"PRIu32"",

                               bpp, pixdepth, vclass);

         return AVERROR_PATCHWELCOME;
     }
 

     if ((ret = ff_get_buffer(avctx, p, 0)) < 0)

         return ret;
 
     p->key_frame = 1;
     p->pict_type = AV_PICTURE_TYPE_I;
 

     if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {

         uint32_t *dst = (uint32_t *)p->data[1];
         uint8_t red, green, blue;
 
         for (i = 0; i < ncolors; i++) {
 

             bytestream2_skipu(&gb, 4); // skip colormap entry number
             red    = bytestream2_get_byteu(&gb);
             bytestream2_skipu(&gb, 1);
             green  = bytestream2_get_byteu(&gb);
             bytestream2_skipu(&gb, 1);
             blue   = bytestream2_get_byteu(&gb);
             bytestream2_skipu(&gb, 3); // skip bitmask flag and padding

 
             dst[i] = red << 16 | green << 8 | blue;
         }
     }
 
     ptr = p->data[0];
     for (i = 0; i < avctx->height; i++) {

         bytestream2_get_bufferu(&gb, ptr, rsize);
         bytestream2_skipu(&gb, lsize - rsize);

         ptr += p->linesize[0];
     }
 

     *got_frame       = 1;

 
     return buf_size;
 }
 
 AVCodec ff_xwd_decoder = {
     .name           = "xwd",

     .long_name      = NULL_IF_CONFIG_SMALL("XWD (X Window Dump) image"),

     .type           = AVMEDIA_TYPE_VIDEO,

     .id             = AV_CODEC_ID_XWD,

     .decode         = xwd_decode_frame,

     .capabilities   = AV_CODEC_CAP_DR1,

 };