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/* GXPSJpegWriter
*
* Copyright (C) 2011 Carlos Garcia Campos <carlosgc@gnome.org>
*
* This library 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.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <config.h>
#include "gxps-jpeg-writer.h"
#include <jpeglib.h>
#include <setjmp.h>
#include <stdint.h>
#include <string.h>
struct _GXPSJpegWriter {
GObject parent;
guchar *row_buffer;
struct jpeg_compress_struct cinfo;
struct jpeg_error_mgr error_mgr;
};
struct _GXPSJpegWriterClass {
GObjectClass parent_class;
};
static void gxps_jpeg_writer_image_writer_iface_init (GXPSImageWriterInterface *iface);
G_DEFINE_TYPE_WITH_CODE (GXPSJpegWriter, gxps_jpeg_writer, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (GXPS_TYPE_IMAGE_WRITER,
gxps_jpeg_writer_image_writer_iface_init))
static void
gxps_jpeg_writer_init (GXPSJpegWriter *jpeg_writer)
{
}
static void
gxps_jpeg_writer_class_init (GXPSJpegWriterClass *klass)
{
}
GXPSImageWriter *
gxps_jpeg_writer_new (void)
{
return GXPS_IMAGE_WRITER (g_object_new (GXPS_TYPE_JPEG_WRITER, NULL));
}
static void
jpeg_output_message (j_common_ptr cinfo)
{
char buffer[JMSG_LENGTH_MAX];
/* Create the message */
(*cinfo->err->format_message) (cinfo, buffer);
g_printerr ("%s\n", buffer);
}
static gboolean
gxps_jpeg_writer_image_writer_init (GXPSImageWriter *image_writer,
FILE *fd,
guint width,
guint height,
guint x_resolution,
guint y_resolution)
{
GXPSJpegWriter *jpeg_writer = GXPS_JPEG_WRITER (image_writer);
jpeg_writer->row_buffer = (guchar *) g_malloc (width * 4);
jpeg_std_error (&jpeg_writer->error_mgr);
jpeg_writer->error_mgr.output_message = jpeg_output_message;
jpeg_create_compress (&jpeg_writer->cinfo);
jpeg_writer->cinfo.err = &jpeg_writer->error_mgr;
jpeg_stdio_dest (&jpeg_writer->cinfo, fd);
jpeg_writer->cinfo.image_width = width;
jpeg_writer->cinfo.image_height = height;
jpeg_writer->cinfo.input_components = 3; /* color components per pixel */
jpeg_writer->cinfo.in_color_space = JCS_RGB; /* colorspace of input image */
jpeg_set_defaults (&jpeg_writer->cinfo);
jpeg_writer->cinfo.density_unit = 1; /* dots per inch */
jpeg_writer->cinfo.X_density = x_resolution;
jpeg_writer->cinfo.Y_density = y_resolution;
jpeg_start_compress (&jpeg_writer->cinfo, TRUE);
return TRUE;
}
static gboolean
gxps_jpeg_writer_image_writer_write (GXPSImageWriter *image_writer,
guchar *row)
{
GXPSJpegWriter *jpeg_writer = GXPS_JPEG_WRITER (image_writer);
guint image_width = jpeg_writer->cinfo.image_width;
uint32_t *pixel = (uint32_t *)row;
guchar *rowp;
guint i;
rowp = jpeg_writer->row_buffer;
for (i = 0; i < image_width; i++, pixel++) {
*rowp++ = (*pixel & 0xff0000) >> 16;
*rowp++ = (*pixel & 0x00ff00) >> 8;
*rowp++ = (*pixel & 0x0000ff) >> 0;
}
jpeg_write_scanlines (&jpeg_writer->cinfo, &jpeg_writer->row_buffer, 1);
return TRUE;
}
static gboolean
gxps_jpeg_writer_image_writer_finish (GXPSImageWriter *image_writer)
{
GXPSJpegWriter *jpeg_writer = GXPS_JPEG_WRITER (image_writer);
jpeg_finish_compress (&jpeg_writer->cinfo);
g_free (jpeg_writer->row_buffer);
jpeg_writer->row_buffer = NULL;
return TRUE;
}
static void
gxps_jpeg_writer_image_writer_iface_init (GXPSImageWriterInterface *iface)
{
iface->init = gxps_jpeg_writer_image_writer_init;
iface->write = gxps_jpeg_writer_image_writer_write;
iface->finish = gxps_jpeg_writer_image_writer_finish;
}
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