/* This file is an image processing operation for GEGL
*
* GEGL 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 3 of the License, or (at your option) any later version.
*
* GEGL 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 GEGL; if not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2006 Kevin Cozens <kcozens@cvs.gimp.org>
*/
#include "config.h"
#include <glib/gi18n-lib.h>
#ifdef GEGL_CHANT_PROPERTIES
gegl_chant_file_path (path, _("File"), "",
_("Path to SVG file to load"))
gegl_chant_int (width, _("Width"), 1, G_MAXINT, 100,
_("Width for rendered image"))
gegl_chant_int (height, _("Height"), 1, G_MAXINT, 100,
_("Height for rendered image"))
#else
#define GEGL_CHANT_TYPE_SOURCE
#define GEGL_CHANT_C_FILE "svg-load.c"
#include "gegl-chant.h"
#include <cairo.h>
#include <librsvg/rsvg.h>
#include <librsvg/rsvg-cairo.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gdk-pixbuf/gdk-pixdata.h>
#define SVG_DEFAULT_RESOLUTION 90.0
#define SVG_DEFAULT_SIZE 500
typedef struct
{
gdouble resolution;
gint width;
gint height;
} SvgLoadVals;
static void prepare (GeglOperation *operation)
{
gegl_operation_set_format (operation, "output", babl_format ("R'G'B'A u8"));
}
static gint
gegl_buffer_import_svg (GeglBuffer *gegl_buffer,
const gchar *path,
gint width,
gint height,
gint dest_x,
gint dest_y,
gint *ret_width,
gint *ret_height)
{
cairo_surface_t *surface;
cairo_t *cr;
GdkPixbuf *pixbuf;
GError *pError = NULL;
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, *ret_width, *ret_height);
cr = cairo_create (surface);
rsvg_init();
/*
FIXME: The routine 'rsvg_pixbuf_from_file_at_size' is deprecated. Set up a
cairo matrix and use rsvg_handle_new_from_file() + rsvg_handle_render_cairo()
instead.
*/
pixbuf = rsvg_pixbuf_from_file_at_size (path,
width,
height,
&pError);
if (pixbuf)
{
guchar *pixeldata;
GeglRectangle rect;
rect.x = dest_x;
rect.y = dest_y;
rect.width = width;
rect.height = height;
pixeldata = gdk_pixbuf_get_pixels (pixbuf);
gegl_buffer_set (gegl_buffer, &rect, 0, babl_format ("R'G'B'A u8"), pixeldata, GEGL_AUTO_ROWSTRIDE);
}
rsvg_term();
cairo_destroy (cr);
cairo_surface_destroy (surface);
return 0;
}
/* This is the callback used from load_rsvg_size(). */
static void
load_get_size_callback (gint *width,
gint *height,
gpointer data)
{
SvgLoadVals *vals = data;
*width = vals->width;
*height = vals->height;
if (*width < 1 || *height < 1)
{
*width = SVG_DEFAULT_SIZE;
*height = SVG_DEFAULT_SIZE;
}
/* cancel loading */
vals->resolution = 0.0;
}
static gint
query_svg (const gchar *path,
gint *width,
gint *height)
{
RsvgHandle *handle;
RsvgDimensionData dimension_data;
GError *pError = NULL;
SvgLoadVals vals;
rsvg_init ();
handle = rsvg_handle_new_from_file (path, &pError);
if (handle == NULL)
return FALSE;
vals.resolution = SVG_DEFAULT_RESOLUTION;
vals.width = *width;
vals.height = *height;
rsvg_handle_set_size_callback (handle, load_get_size_callback, &vals, NULL);
rsvg_handle_get_dimensions (handle, &dimension_data);
rsvg_handle_free (handle);
rsvg_term ();
*width = dimension_data.width;
*height = dimension_data.height;
return TRUE;
}
static GeglRectangle
get_bounding_box (GeglOperation *operation)
{
GeglChantO *o = GEGL_CHANT_PROPERTIES (operation);
GeglRectangle result = {0,0,0,0};
/*GeglOperationSource *source = GEGL_OPERATION_SOURCE(operation);*/
gint width, height;
gint status;
/*if (!strcmp (o->path, "-"))
{
process (operation);
width = source->output->width;
height = source->output->height;
}
else*/
{
width = o->width;
height = o->height;
status = query_svg (o->path, &width, &height);
if (status == FALSE)
{
g_warning ("get defined region of %s failed", o->path);
width = 0;
height = 0;
}
}
result.width = width;
result.height = height;
return result;
}
static gboolean
process (GeglOperation *operation,
GeglBuffer *output,
const GeglRectangle *result_foo,
gint level)
{
GeglChantO *o = GEGL_CHANT_PROPERTIES (operation);
gint result;
gint width, height;
width = o->width;
height = o->height;
result = query_svg (o->path, &width, &height);
if (result == FALSE)
{
g_warning ("%s failed to open file %s for reading.",
G_OBJECT_TYPE_NAME (operation), o->path);
return FALSE;
}
result = gegl_buffer_import_svg (output, o->path,
width, height, 0, 0, &width, &height);
if (result)
{
g_warning ("%s failed to open file %s for reading.",
G_OBJECT_TYPE_NAME (operation), o->path);
return FALSE;
}
return TRUE;
}
static void
gegl_chant_class_init (GeglChantClass *klass)
{
GeglOperationClass *operation_class;
GeglOperationSourceClass *source_class;
operation_class = GEGL_OPERATION_CLASS (klass);
source_class = GEGL_OPERATION_SOURCE_CLASS (klass);
source_class->process = process;
operation_class->prepare = prepare;
operation_class->get_bounding_box = get_bounding_box;
gegl_operation_class_set_keys (operation_class,
"name" , "gegl:svg-load",
"categories" , "input", /* not hidden because it has extra API */
"description" , _("Load an SVG file using librsvg"),
NULL);
/* static gboolean done=FALSE;
if (done)
return; */
gegl_extension_handler_register (".svg", "gegl:svg-load");
gegl_extension_handler_register (".svgz", "gegl:svg-load");
/* done = TRUE; */
}
#endif