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/* GXPSImageConverter
*
* 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-image-converter.h"
#include <stdint.h>
#include <math.h>
#include <string.h>
#include <libgxps/gxps.h>
G_DEFINE_ABSTRACT_TYPE (GXPSImageConverter, gxps_image_converter, GXPS_TYPE_CONVERTER)
static guint
get_n_digits (GXPSDocument *document)
{
guint n_pages = gxps_document_get_n_pages (document);
guint retval = 0;
while (n_pages >= 10) {
n_pages /= 10;
retval++;
}
return retval + 1;
}
static void
gxps_converter_image_converter_begin_document (GXPSConverter *converter,
const gchar *output_filename,
GXPSPage *first_page)
{
GXPSImageConverter *image_converter = GXPS_IMAGE_CONVERTER (converter);
image_converter->page_prefix = g_strdup (output_filename ? output_filename : "page");
image_converter->n_digits = get_n_digits (converter->document);
}
static cairo_t *
gxps_converter_image_converter_begin_page (GXPSConverter *converter,
GXPSPage *page,
guint n_page)
{
GXPSImageConverter *image_converter = GXPS_IMAGE_CONVERTER (converter);
gdouble page_width, page_height;
gdouble output_width, output_height;
cairo_t *cr;
g_return_val_if_fail (converter->surface == NULL, NULL);
image_converter->current_page = n_page;
gxps_page_get_size (page, &page_width, &page_height);
gxps_converter_get_crop_size (converter,
page_width * (converter->x_resolution / 96.0),
page_height * (converter->y_resolution / 96.0),
&output_width, &output_height);
converter->surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
ceil (output_width),
ceil (output_height));
cr = cairo_create (converter->surface);
if (image_converter->fill_background) {
cairo_save (cr);
cairo_set_source_rgb (cr, 1, 1, 1);
cairo_paint (cr);
cairo_restore (cr);
}
cairo_translate (cr, -converter->crop.x, -converter->crop.y);
cairo_scale (cr, converter->x_resolution / 96.0, converter->y_resolution / 96.0);
return cr;
}
static void
gxps_converter_image_converter_end_page (GXPSConverter *converter)
{
GXPSImageConverter *image_converter = GXPS_IMAGE_CONVERTER (converter);
cairo_status_t status;
const gchar *extension = gxps_converter_get_extension (converter);
gchar *page_filename;
FILE *fd;
guint width, height;
gint stride;
guchar *data;
gint y;
g_return_if_fail (converter->surface != NULL);
g_return_if_fail (GXPS_IS_IMAGE_WRITER (image_converter->writer));
width = cairo_image_surface_get_width (converter->surface);
height = cairo_image_surface_get_height (converter->surface);
stride = cairo_image_surface_get_stride (converter->surface);
data = cairo_image_surface_get_data (converter->surface);
page_filename = g_strdup_printf ("%s-%0*d.%s",
image_converter->page_prefix,
image_converter->n_digits,
image_converter->current_page,
extension);
fd = fopen (page_filename, "wb");
if (!fd) {
g_printerr ("Error opening output file %s\n", page_filename);
g_free (page_filename);
cairo_surface_destroy (converter->surface);
converter->surface = NULL;
return;
}
if (!gxps_image_writer_init (image_converter->writer, fd, width, height,
converter->x_resolution, converter->y_resolution)) {
g_printerr ("Error writing %s\n", page_filename);
g_free (page_filename);
fclose (fd);
cairo_surface_destroy (converter->surface);
converter->surface = NULL;
return;
}
for (y = 0; y < height; y++)
gxps_image_writer_write (image_converter->writer, data + y * stride);
gxps_image_writer_finish (image_converter->writer);
fclose (fd);
g_free (page_filename);
cairo_surface_finish (converter->surface);
status = cairo_surface_status (converter->surface);
if (status)
g_printerr ("Cairo error: %s\n", cairo_status_to_string (status));
cairo_surface_destroy (converter->surface);
converter->surface = NULL;
}
static void
gxps_image_converter_finalize (GObject *object)
{
GXPSImageConverter *converter = GXPS_IMAGE_CONVERTER (object);
g_clear_pointer (&converter->page_prefix, g_free);
g_clear_object (&converter->writer);
G_OBJECT_CLASS (gxps_image_converter_parent_class)->finalize (object);
}
static void
gxps_image_converter_init (GXPSImageConverter *converter)
{
GXPSImageConverter *image_converter = GXPS_IMAGE_CONVERTER (converter);
image_converter->fill_background = TRUE;
}
static void
gxps_image_converter_class_init (GXPSImageConverterClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GXPSConverterClass *converter_class = GXPS_CONVERTER_CLASS (klass);
object_class->finalize = gxps_image_converter_finalize;
converter_class->begin_document = gxps_converter_image_converter_begin_document;
converter_class->begin_page = gxps_converter_image_converter_begin_page;
converter_class->end_page = gxps_converter_image_converter_end_page;
}
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