libavcodec/xwdenc.c

   1 /*
   2  * XWD image format
   3  *
   4  * Copyright (c) 2012 Paul B Mahol
   5  *
   6  * This file is part of Libav.
   7  *
   8  * Libav is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * Libav is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with Libav; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include "libavutil/intreadwrite.h"
  24 #include "libavutil/pixdesc.h"
  25 #include "avcodec.h"
  26 #include "bytestream.h"
  27 #include "xwd.h"
  28
  29 #define WINDOW_NAME         "lavcxwdenc"
  30 #define WINDOW_NAME_SIZE    11
  31
  32 static av_cold int xwd_encode_init(AVCodecContext *avctx)
  33 {
  34     avctx->coded_frame = avcodec_alloc_frame();
  35     if (!avctx->coded_frame)
  36         return AVERROR(ENOMEM);
  37
  38     return 0;
  39 }
  40
  41 static int xwd_encode_frame(AVCodecContext *avctx, uint8_t *buf,
  42                             int buf_size, void *data)
  43 {
  44     AVFrame *p = data;
  45     enum PixelFormat pix_fmt = avctx->pix_fmt;
  46     uint32_t pixdepth, bpp, bpad, ncolors = 0, lsize, vclass, be = 0;
  47     uint32_t rgb[3] = { 0 };
  48     uint32_t header_size;
  49     int i, out_size;
  50     uint8_t *ptr;
  51
  52     pixdepth = av_get_bits_per_pixel(&av_pix_fmt_descriptors[pix_fmt]);
  53     if (av_pix_fmt_descriptors[pix_fmt].flags & PIX_FMT_BE)
  54         be = 1;
  55     switch (pix_fmt) {
  56     case PIX_FMT_ARGB:
  57     case PIX_FMT_BGRA:
  58     case PIX_FMT_RGBA:
  59     case PIX_FMT_ABGR:
  60         if (pix_fmt == PIX_FMT_ARGB ||
  61             pix_fmt == PIX_FMT_ABGR)
  62             be = 1;
  63         if (pix_fmt == PIX_FMT_ABGR ||
  64             pix_fmt == PIX_FMT_RGBA) {
  65             rgb[0] = 0xFF;
  66             rgb[1] = 0xFF00;
  67             rgb[2] = 0xFF0000;
  68         } else {
  69             rgb[0] = 0xFF0000;
  70             rgb[1] = 0xFF00;
  71             rgb[2] = 0xFF;
  72         }
  73         bpp      = 32;
  74         pixdepth = 24;
  75         vclass   = XWD_TRUE_COLOR;
  76         bpad     = 32;
  77         break;
  78     case PIX_FMT_BGR24:
  79     case PIX_FMT_RGB24:
  80         if (pix_fmt == PIX_FMT_RGB24)
  81             be = 1;
  82         bpp      = 24;
  83         vclass   = XWD_TRUE_COLOR;
  84         bpad     = 32;
  85         rgb[0]   = 0xFF0000;
  86         rgb[1]   = 0xFF00;
  87         rgb[2]   = 0xFF;
  88         break;
  89     case PIX_FMT_RGB565LE:
  90     case PIX_FMT_RGB565BE:
  91     case PIX_FMT_BGR565LE:
  92     case PIX_FMT_BGR565BE:
  93         if (pix_fmt == PIX_FMT_BGR565LE ||
  94             pix_fmt == PIX_FMT_BGR565BE) {
  95             rgb[0] = 0x1F;
  96             rgb[1] = 0x7E0;
  97             rgb[2] = 0xF800;
  98         } else {
  99             rgb[0] = 0xF800;
 100             rgb[1] = 0x7E0;
 101             rgb[2] = 0x1F;
 102         }
 103         bpp      = 16;
 104         vclass   = XWD_TRUE_COLOR;
 105         bpad     = 16;
 106         break;
 107     case PIX_FMT_RGB555LE:
 108     case PIX_FMT_RGB555BE:
 109     case PIX_FMT_BGR555LE:
 110     case PIX_FMT_BGR555BE:
 111         if (pix_fmt == PIX_FMT_BGR555LE ||
 112             pix_fmt == PIX_FMT_BGR555BE) {
 113             rgb[0] = 0x1F;
 114             rgb[1] = 0x3E0;
 115             rgb[2] = 0x7C00;
 116         } else {
 117             rgb[0] = 0x7C00;
 118             rgb[1] = 0x3E0;
 119             rgb[2] = 0x1F;
 120         }
 121         bpp      = 16;
 122         vclass   = XWD_TRUE_COLOR;
 123         bpad     = 16;
 124         break;
 125     case PIX_FMT_RGB8:
 126     case PIX_FMT_BGR8:
 127     case PIX_FMT_RGB4_BYTE:
 128     case PIX_FMT_BGR4_BYTE:
 129     case PIX_FMT_PAL8:
 130         bpp      = 8;
 131         vclass   = XWD_PSEUDO_COLOR;
 132         bpad     = 8;
 133         ncolors  = 256;
 134         break;
 135     case PIX_FMT_MONOWHITE:
 136         bpp      = 1;
 137         bpad     = 8;
 138         vclass   = XWD_STATIC_GRAY;
 139         break;
 140     default:
 141         av_log(avctx, AV_LOG_INFO, "unsupported pixel format\n");
 142         return AVERROR(EINVAL);
 143     }
 144
 145     lsize       = FFALIGN(bpp * avctx->width, bpad) / 8;
 146     header_size = XWD_HEADER_SIZE + WINDOW_NAME_SIZE;
 147     out_size    = header_size + ncolors * XWD_CMAP_SIZE + avctx->height * lsize;
 148
 149     if (buf_size < out_size) {
 150         av_log(avctx, AV_LOG_ERROR, "output buffer too small\n");
 151         return AVERROR(ENOMEM);
 152     }
 153
 154     avctx->coded_frame->key_frame = 1;
 155     avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
 156
 157     bytestream_put_be32(&buf, header_size);
 158     bytestream_put_be32(&buf, XWD_VERSION);   // file version
 159     bytestream_put_be32(&buf, XWD_Z_PIXMAP);  // pixmap format
 160     bytestream_put_be32(&buf, pixdepth);      // pixmap depth in pixels
 161     bytestream_put_be32(&buf, avctx->width);  // pixmap width in pixels
 162     bytestream_put_be32(&buf, avctx->height); // pixmap height in pixels
 163     bytestream_put_be32(&buf, 0);             // bitmap x offset
 164     bytestream_put_be32(&buf, be);            // byte order
 165     bytestream_put_be32(&buf, 32);            // bitmap unit
 166     bytestream_put_be32(&buf, be);            // bit-order of image data
 167     bytestream_put_be32(&buf, bpad);          // bitmap scan-line pad in bits
 168     bytestream_put_be32(&buf, bpp);           // bits per pixel
 169     bytestream_put_be32(&buf, lsize);         // bytes per scan-line
 170     bytestream_put_be32(&buf, vclass);        // visual class
 171     bytestream_put_be32(&buf, rgb[0]);        // red mask
 172     bytestream_put_be32(&buf, rgb[1]);        // green mask
 173     bytestream_put_be32(&buf, rgb[2]);        // blue mask
 174     bytestream_put_be32(&buf, 8);             // size of each bitmask in bits
 175     bytestream_put_be32(&buf, ncolors);       // number of colors
 176     bytestream_put_be32(&buf, ncolors);       // number of entries in color map
 177     bytestream_put_be32(&buf, avctx->width);  // window width
 178     bytestream_put_be32(&buf, avctx->height); // window height
 179     bytestream_put_be32(&buf, 0);             // window upper left X coordinate
 180     bytestream_put_be32(&buf, 0);             // window upper left Y coordinate
 181     bytestream_put_be32(&buf, 0);             // window border width
 182     bytestream_put_buffer(&buf, WINDOW_NAME, WINDOW_NAME_SIZE);
 183
 184     for (i = 0; i < ncolors; i++) {
 185         uint32_t val;
 186         uint8_t red, green, blue;
 187
 188         val   = AV_RN32A(p->data[1] + i * 4);
 189         red   = (val >> 16) & 0xFF;
 190         green = (val >>  8) & 0xFF;
 191         blue  =  val        & 0xFF;
 192
 193         bytestream_put_be32(&buf, i);         // colormap entry number
 194         bytestream_put_be16(&buf, red   << 8);
 195         bytestream_put_be16(&buf, green << 8);
 196         bytestream_put_be16(&buf, blue  << 8);
 197         bytestream_put_byte(&buf, 0x7);       // bitmask flag
 198         bytestream_put_byte(&buf, 0);         // padding
 199     }
 200
 201     ptr = p->data[0];
 202     for (i = 0; i < avctx->height; i++) {
 203         bytestream_put_buffer(&buf, ptr, lsize);
 204         ptr += p->linesize[0];
 205     }
 206
 207     return out_size;
 208 }
 209
 210 static av_cold int xwd_encode_close(AVCodecContext *avctx)
 211 {
 212     av_freep(&avctx->coded_frame);
 213
 214     return 0;
 215 }
 216
 217 AVCodec ff_xwd_encoder = {
 218     .name         = "xwd",
 219     .type         = AVMEDIA_TYPE_VIDEO,
 220     .id           = CODEC_ID_XWD,
 221     .init         = xwd_encode_init,
 222     .encode       = xwd_encode_frame,
 223     .close        = xwd_encode_close,
 224     .pix_fmts     = (const enum PixelFormat[]) { PIX_FMT_BGRA,
 225                                                  PIX_FMT_RGBA,
 226                                                  PIX_FMT_ARGB,
 227                                                  PIX_FMT_ABGR,
 228                                                  PIX_FMT_RGB24,
 229                                                  PIX_FMT_BGR24,
 230                                                  PIX_FMT_RGB565BE,
 231                                                  PIX_FMT_RGB565LE,
 232                                                  PIX_FMT_BGR565BE,
 233                                                  PIX_FMT_BGR565LE,
 234                                                  PIX_FMT_RGB555BE,
 235                                                  PIX_FMT_RGB555LE,
 236                                                  PIX_FMT_BGR555BE,
 237                                                  PIX_FMT_BGR555LE,
 238                                                  PIX_FMT_RGB8,
 239                                                  PIX_FMT_BGR8,
 240                                                  PIX_FMT_RGB4_BYTE,
 241                                                  PIX_FMT_BGR4_BYTE,
 242                                                  PIX_FMT_PAL8,
 243                                                  PIX_FMT_MONOWHITE,
 244                                                  PIX_FMT_NONE },
 245     .long_name    = NULL_IF_CONFIG_SMALL("XWD (X Window Dump) image"),
 246 };