XWD encoder and decoder

Signed-off-by: Kostya Shishkov <kostya.shishkov@gmail.com>

1 files changed, 246 insertions, 0 deletions

diff --git a/libavcodec/xwdenc.c b/libavcodec/xwdenc.c
new file mode 100644
index 0000000000..5bfdaf780a
--- /dev/null
+++ b/libavcodec/xwdenc.c
@@ -0,0 +1,246 @@
+/*
+ * XWD image format
+ *
+ * Copyright (c) 2012 Paul B Mahol
+ *
+ * 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 "libavutil/intreadwrite.h"
+#include "libavutil/pixdesc.h"
+#include "avcodec.h"
+#include "bytestream.h"
+#include "xwd.h"
+
+#define WINDOW_NAME         "lavcxwdenc"
+#define WINDOW_NAME_SIZE    11
+
+static av_cold int xwd_encode_init(AVCodecContext *avctx)
+{
+    avctx->coded_frame = avcodec_alloc_frame();
+    if (!avctx->coded_frame)
+        return AVERROR(ENOMEM);
+
+    return 0;
+}
+
+static int xwd_encode_frame(AVCodecContext *avctx, uint8_t *buf,
+                            int buf_size, void *data)
+{
+    AVFrame *p = data;
+    enum PixelFormat pix_fmt = avctx->pix_fmt;
+    uint32_t pixdepth, bpp, bpad, ncolors = 0, lsize, vclass, be = 0;
+    uint32_t rgb[3] = { 0 };
+    uint32_t header_size;
+    int i, out_size;
+    uint8_t *ptr;
+
+    pixdepth = av_get_bits_per_pixel(&av_pix_fmt_descriptors[pix_fmt]);
+    if (av_pix_fmt_descriptors[pix_fmt].flags & PIX_FMT_BE)
+        be = 1;
+    switch (pix_fmt) {
+    case PIX_FMT_ARGB:
+    case PIX_FMT_BGRA:
+    case PIX_FMT_RGBA:
+    case PIX_FMT_ABGR:
+        if (pix_fmt == PIX_FMT_ARGB ||
+            pix_fmt == PIX_FMT_ABGR)
+            be = 1;
+        if (pix_fmt == PIX_FMT_ABGR ||
+            pix_fmt == PIX_FMT_RGBA) {
+            rgb[0] = 0xFF;
+            rgb[1] = 0xFF00;
+            rgb[2] = 0xFF0000;
+        } else {
+            rgb[0] = 0xFF0000;
+            rgb[1] = 0xFF00;
+            rgb[2] = 0xFF;
+        }
+        bpp      = 32;
+        pixdepth = 24;
+        vclass   = XWD_TRUE_COLOR;
+        bpad     = 32;
+        break;
+    case PIX_FMT_BGR24:
+    case PIX_FMT_RGB24:
+        if (pix_fmt == PIX_FMT_RGB24)
+            be = 1;
+        bpp      = 24;
+        vclass   = XWD_TRUE_COLOR;
+        bpad     = 32;
+        rgb[0]   = 0xFF0000;
+        rgb[1]   = 0xFF00;
+        rgb[2]   = 0xFF;
+        break;
+    case PIX_FMT_RGB565LE:
+    case PIX_FMT_RGB565BE:
+    case PIX_FMT_BGR565LE:
+    case PIX_FMT_BGR565BE:
+        if (pix_fmt == PIX_FMT_BGR565LE ||
+            pix_fmt == PIX_FMT_BGR565BE) {
+            rgb[0] = 0x1F;
+            rgb[1] = 0x7E0;
+            rgb[2] = 0xF800;
+        } else {
+            rgb[0] = 0xF800;
+            rgb[1] = 0x7E0;
+            rgb[2] = 0x1F;
+        }
+        bpp      = 16;
+        vclass   = XWD_TRUE_COLOR;
+        bpad     = 16;
+        break;
+    case PIX_FMT_RGB555LE:
+    case PIX_FMT_RGB555BE:
+    case PIX_FMT_BGR555LE:
+    case PIX_FMT_BGR555BE:
+        if (pix_fmt == PIX_FMT_BGR555LE ||
+            pix_fmt == PIX_FMT_BGR555BE) {
+            rgb[0] = 0x1F;
+            rgb[1] = 0x3E0;
+            rgb[2] = 0x7C00;
+        } else {
+            rgb[0] = 0x7C00;
+            rgb[1] = 0x3E0;
+            rgb[2] = 0x1F;
+        }
+        bpp      = 16;
+        vclass   = XWD_TRUE_COLOR;
+        bpad     = 16;
+        break;
+    case PIX_FMT_RGB8:
+    case PIX_FMT_BGR8:
+    case PIX_FMT_RGB4_BYTE:
+    case PIX_FMT_BGR4_BYTE:
+    case PIX_FMT_PAL8:
+        bpp      = 8;
+        vclass   = XWD_PSEUDO_COLOR;
+        bpad     = 8;
+        ncolors  = 256;
+        break;
+    case PIX_FMT_MONOWHITE:
+        bpp      = 1;
+        bpad     = 8;
+        vclass   = XWD_STATIC_GRAY;
+        break;
+    default:
+        av_log(avctx, AV_LOG_INFO, "unsupported pixel format\n");
+        return AVERROR(EINVAL);
+    }
+
+    lsize       = FFALIGN(bpp * avctx->width, bpad) / 8;
+    header_size = XWD_HEADER_SIZE + WINDOW_NAME_SIZE;
+    out_size    = header_size + ncolors * XWD_CMAP_SIZE + avctx->height * lsize;
+
+    if (buf_size < out_size) {
+        av_log(avctx, AV_LOG_ERROR, "output buffer too small\n");
+        return AVERROR(ENOMEM);
+    }
+
+    avctx->coded_frame->key_frame = 1;
+    avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
+
+    bytestream_put_be32(&buf, header_size);
+    bytestream_put_be32(&buf, XWD_VERSION);   // file version
+    bytestream_put_be32(&buf, XWD_Z_PIXMAP);  // pixmap format
+    bytestream_put_be32(&buf, pixdepth);      // pixmap depth in pixels
+    bytestream_put_be32(&buf, avctx->width);  // pixmap width in pixels
+    bytestream_put_be32(&buf, avctx->height); // pixmap height in pixels
+    bytestream_put_be32(&buf, 0);             // bitmap x offset
+    bytestream_put_be32(&buf, be);            // byte order
+    bytestream_put_be32(&buf, 32);            // bitmap unit
+    bytestream_put_be32(&buf, be);            // bit-order of image data
+    bytestream_put_be32(&buf, bpad);          // bitmap scan-line pad in bits
+    bytestream_put_be32(&buf, bpp);           // bits per pixel
+    bytestream_put_be32(&buf, lsize);         // bytes per scan-line
+    bytestream_put_be32(&buf, vclass);        // visual class
+    bytestream_put_be32(&buf, rgb[0]);        // red mask
+    bytestream_put_be32(&buf, rgb[1]);        // green mask
+    bytestream_put_be32(&buf, rgb[2]);        // blue mask
+    bytestream_put_be32(&buf, 8);             // size of each bitmask in bits
+    bytestream_put_be32(&buf, ncolors);       // number of colors
+    bytestream_put_be32(&buf, ncolors);       // number of entries in color map
+    bytestream_put_be32(&buf, avctx->width);  // window width
+    bytestream_put_be32(&buf, avctx->height); // window height
+    bytestream_put_be32(&buf, 0);             // window upper left X coordinate
+    bytestream_put_be32(&buf, 0);             // window upper left Y coordinate
+    bytestream_put_be32(&buf, 0);             // window border width
+    bytestream_put_buffer(&buf, WINDOW_NAME, WINDOW_NAME_SIZE);
+
+    for (i = 0; i < ncolors; i++) {
+        uint32_t val;
+        uint8_t red, green, blue;
+
+        val   = AV_RN32A(p->data[1] + i * 4);
+        red   = (val >> 16) & 0xFF;
+        green = (val >>  8) & 0xFF;
+        blue  =  val        & 0xFF;
+
+        bytestream_put_be32(&buf, i);         // colormap entry number
+        bytestream_put_be16(&buf, red   << 8);
+        bytestream_put_be16(&buf, green << 8);
+        bytestream_put_be16(&buf, blue  << 8);
+        bytestream_put_byte(&buf, 0x7);       // bitmask flag
+        bytestream_put_byte(&buf, 0);         // padding
+    }
+
+    ptr = p->data[0];
+    for (i = 0; i < avctx->height; i++) {
+        bytestream_put_buffer(&buf, ptr, lsize);
+        ptr += p->linesize[0];
+    }
+
+    return out_size;
+}
+
+static av_cold int xwd_encode_close(AVCodecContext *avctx)
+{
+    av_freep(&avctx->coded_frame);
+
+    return 0;
+}
+
+AVCodec ff_xwd_encoder = {
+    .name         = "xwd",
+    .type         = AVMEDIA_TYPE_VIDEO,
+    .id           = CODEC_ID_XWD,
+    .init         = xwd_encode_init,
+    .encode       = xwd_encode_frame,
+    .close        = xwd_encode_close,
+    .pix_fmts     = (const enum PixelFormat[]) { PIX_FMT_BGRA,
+                                                 PIX_FMT_RGBA,
+                                                 PIX_FMT_ARGB,
+                                                 PIX_FMT_ABGR,
+                                                 PIX_FMT_RGB24,
+                                                 PIX_FMT_BGR24,
+                                                 PIX_FMT_RGB565BE,
+                                                 PIX_FMT_RGB565LE,
+                                                 PIX_FMT_BGR565BE,
+                                                 PIX_FMT_BGR565LE,
+                                                 PIX_FMT_RGB555BE,
+                                                 PIX_FMT_RGB555LE,
+                                                 PIX_FMT_BGR555BE,
+                                                 PIX_FMT_BGR555LE,
+                                                 PIX_FMT_RGB8,
+                                                 PIX_FMT_BGR8,
+                                                 PIX_FMT_RGB4_BYTE,
+                                                 PIX_FMT_BGR4_BYTE,
+                                                 PIX_FMT_PAL8,
+                                                 PIX_FMT_MONOWHITE,
+                                                 PIX_FMT_NONE },
+    .long_name    = NULL_IF_CONFIG_SMALL("XWD (X Window Dump) image"),
+};