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* beryl-plugins::jpeg.c - adds JPEG image support to beryl.
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* Copyright: (C) 2006 Nicholas Thomas
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* Danny Baumann (JPEG writing, option stuff)
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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COMPIZ_PLUGIN_20090315 (imgjpeg, JpegPluginVTable)
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rgbToBGRA (const JSAMPLE *source,
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int height = size.height ();
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int width = size.width ();
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dest = (char *) malloc ((unsigned)(height * width * 4));
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for (h = 0; h < height; h++)
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for (w = 0; w < width; w++)
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int pos = h * width + w;
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#if __BYTE_ORDER == __BIG_ENDIAN
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dest[(pos * 4) + 3] = source[(pos * 3) + 2]; /* blue */
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dest[(pos * 4) + 2] = source[(pos * 3) + 1]; /* green */
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dest[(pos * 4) + 1] = source[(pos * 3) + 0]; /* red */
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dest[(pos * 4) + 0] = alpha;
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dest[(pos * 4) + 0] = (char)source[(pos * 3) + 2]; /* blue */
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dest[(pos * 4) + 1] = (char)source[(pos * 3) + 1]; /* green */
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dest[(pos * 4) + 2] = (char)source[(pos * 3) + 0]; /* red */
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dest[(pos * 4) + 3] = alpha;
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rgbaToRGB (unsigned char *source,
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int height = size.height ();
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int width = size.width ();
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int ps = stride / width; /* pixel size */
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d = (JSAMPLE *) malloc ((unsigned)height * (unsigned)width * 3 *
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for (h = 0; h < height; h++)
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for (w = 0; w < width; w++)
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int pos = h * width + w;
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#if __BYTE_ORDER == __BIG_ENDIAN
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d[(pos * 3) + 0] = source[(pos * ps) + 3]; /* red */
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d[(pos * 3) + 1] = source[(pos * ps) + 2]; /* green */
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d[(pos * 3) + 2] = source[(pos * ps) + 1]; /* blue */
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d[(pos * 3) + 0] = source[(pos * ps) + 0]; /* red */
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d[(pos * 3) + 1] = source[(pos * ps) + 1]; /* green */
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d[(pos * 3) + 2] = source[(pos * ps) + 2]; /* blue */
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jpegErrorExit (j_common_ptr cinfo)
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char buffer[JMSG_LENGTH_MAX];
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struct jpegErrorMgr *err = (struct jpegErrorMgr *) cinfo->err;
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/* Format the message */
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(*cinfo->err->format_message) (cinfo, buffer);
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printf ("%s\n", buffer);
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/* Return control to the setjmp point */
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longjmp (err->setjmp_buffer, 1);
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JpegScreen::readJPEG (FILE *file,
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struct jpeg_decompress_struct cinfo;
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struct jpegErrorMgr jerr;
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cinfo.err = jpeg_std_error (&jerr.pub);
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jerr.pub.error_exit = jpegErrorExit;
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if (setjmp (jerr.setjmp_buffer))
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/* this is called on decompression errors */
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jpeg_destroy_decompress (&cinfo);
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jpeg_create_decompress (&cinfo);
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jpeg_stdio_src (&cinfo, file);
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jpeg_read_header (&cinfo, true);
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cinfo.out_color_space = JCS_RGB;
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jpeg_start_decompress (&cinfo);
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size.setHeight ((int)cinfo.output_height);
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size.setWidth ((int)cinfo.output_width);
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buf = (JSAMPLE *) calloc (cinfo.output_height * cinfo.output_width *
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(unsigned)cinfo.output_components,
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jpeg_finish_decompress (&cinfo);
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jpeg_destroy_decompress (&cinfo);
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rows = (JSAMPROW *) malloc (cinfo.output_height * sizeof (JSAMPROW));
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jpeg_finish_decompress (&cinfo);
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jpeg_destroy_decompress (&cinfo);
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for (unsigned int i = 0; i < cinfo.output_height; i++)
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rows[i] = &buf[i * cinfo.output_width *
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(unsigned)cinfo.output_components];
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while (cinfo.output_scanline < cinfo.output_height)
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jpeg_read_scanlines (&cinfo, &rows[cinfo.output_scanline],
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cinfo.output_height - cinfo.output_scanline);
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jpeg_finish_decompress (&cinfo);
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jpeg_destroy_decompress (&cinfo);
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/* convert the rgb data into BGRA format */
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result = rgbToBGRA (buf, data, size, 255);
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JpegScreen::writeJPEG (unsigned char *buffer,
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struct jpeg_compress_struct cinfo;
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struct jpeg_error_mgr jerr;
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JSAMPROW row_pointer[1];
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/* convert the rgb data into BGRA format */
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if (!rgbaToRGB (buffer, &data, size, stride))
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cinfo.err = jpeg_std_error (&jerr);
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jpeg_create_compress (&cinfo);
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jpeg_stdio_dest (&cinfo, file);
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cinfo.image_width = (unsigned) size.width ();
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cinfo.image_height = (unsigned) size.height ();
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cinfo.input_components = 3;
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cinfo.in_color_space = JCS_RGB;
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jpeg_set_defaults (&cinfo);
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jpeg_set_quality (&cinfo, optionGetQuality (), true);
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jpeg_start_compress (&cinfo, true);
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while (cinfo.next_scanline < cinfo.image_height)
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&data[(cinfo.image_height - cinfo.next_scanline - 1) *
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(unsigned) size.width () * 3];
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jpeg_write_scanlines (&cinfo, row_pointer, 1);
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jpeg_finish_compress (&cinfo);
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jpeg_destroy_compress (&cinfo);
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JpegScreen::fileNameWithExtension (CompString &path)
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unsigned int len = path.length ();
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if ((len > 5 && path.substr (len - 5, 5) == ".jpeg") ||
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(len > 4 && path.substr (len - 4, 4) == ".jpg"))
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return path + ".jpeg";
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JpegScreen::imageToFile (CompString &path,
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CompString fileName = fileNameWithExtension (path);
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if (format == "jpeg" || format == "jpg" ||
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!(status = screen->imageToFile (path, format, size, stride, data)))
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file = fopen (fileName.c_str (), "wb");
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status = writeJPEG ((unsigned char *) data, file, size, stride);
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JpegScreen::fileToImage (CompString &name,
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CompString fileName = fileNameWithExtension (name);
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file = fopen (fileName.c_str (), "rb");
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status = readJPEG (file, size, data);
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stride = size.width () * 4;
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/* Isn't a JPEG - pass to the next in the chain. */
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return screen->fileToImage (name, size, stride, data);
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JpegScreen::JpegScreen (CompScreen *screen) :
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PluginClassHandler<JpegScreen, CompScreen> (screen)
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ScreenInterface::setHandler (screen, true);
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JpegPluginVTable::init ()
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if (!CompPlugin::checkPluginABI ("core", CORE_ABIVERSION))
added
removed
jpeg/src/imgjpeg.cpp
