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/*
* Copyright 2011 Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 3, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranties of
* MERCHANTABILITY, SATISFACTORY QUALITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the applicable version of the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of both the GNU Lesser General Public
* License version 3 along with this program. If not, see
* <http://www.gnu.org/licenses/>
**
* Authored by: Nick Dedekind <nick.dedekind@canonical.com>
*
*/
#include <Nux/Nux.h>
#include "ThumbnailGenerator.h"
#include "UnityCore/GLibWrapper.h"
#include "TextureThumbnailProvider.h"
namespace unity
{
namespace TextureThumbnailProvider
{
class GdkTextureThumbnailer : public Thumbnailer
{
public:
GdkTextureThumbnailer(std::string const& name)
: name(name)
{}
virtual ~GdkTextureThumbnailer() {}
std::string name;
virtual std::string GetName() const { return name; }
virtual bool Run(int size, std::string const& input_file, std::string& output_file, std::string& error_hint);
};
bool GdkTextureThumbnailer::Run(int size, std::string const& input_file, std::string& output_file, std::string& error_hint)
{
GFileInputStream *stream;
GError *error = NULL;
GFile *file;
/* try to open the source file for reading */
file = g_file_new_for_uri (input_file.c_str());
stream = g_file_read (file, NULL, &error);
g_object_unref (file);
if (error != NULL)
{
error_hint = error->message;
g_error_free (error);
return false;
}
glib::Object<GdkPixbuf> source_pixbuf(::gdk_pixbuf_new_from_stream_at_scale(G_INPUT_STREAM (stream),
-1,
size,
TRUE,
NULL,
NULL));
// glib::Object<GdkPixbuf> source_pixbuf(gdk_pixbuf_new_from_stream (G_INPUT_STREAM (stream),
// NULL, &error));
g_object_unref (stream);
if (error != NULL)
{
error_hint = error->message;
g_error_free (error);
return false;
}
/**************************
* Generate Scaled buffer *
**************************/
gdouble hratio;
gdouble wratio;
gint dest_width = size;
gint dest_height = size;
gint source_width;
gint source_height;
/* determine the source pixbuf dimensions */
source_width = gdk_pixbuf_get_width (source_pixbuf);
source_height = gdk_pixbuf_get_height (source_pixbuf);
/* return the same pixbuf if no scaling is required */
if (source_width <= dest_width && source_height <= dest_height)
{
gdk_pixbuf_save(source_pixbuf, output_file.c_str(), "png", &error, NULL);
if (error != NULL)
{
error_hint = error->message;
g_error_free (error);
return false;
}
}
/* determine which axis needs to be scaled down more */
wratio = (gdouble) source_width / (gdouble) dest_width;
hratio = (gdouble) source_height / (gdouble) dest_height;
/* adjust the other axis */
if (hratio > wratio)
dest_width = rint (source_width / hratio);
else
dest_height = rint (source_height / wratio);
/* scale the pixbuf down to the desired size */
glib::Object<GdkPixbuf> thumbnail_buffer(gdk_pixbuf_scale_simple (source_pixbuf,
MAX (dest_width, 1), MAX (dest_height, 1),
GDK_INTERP_BILINEAR));
gdk_pixbuf_save(thumbnail_buffer, output_file.c_str(), "png", &error, NULL);
if (error != NULL)
{
error_hint = error->message;
g_error_free (error);
return false;
}
return true;
}
void Initialise()
{
GSList *formats;
GSList *fp;
GStrv format_types;
guint n;
std::list<std::string> mime_types;
/* get a list of all formats supported by GdkPixbuf */
formats = gdk_pixbuf_get_formats ();
/* iterate over all formats */
for (fp = formats; fp != NULL; fp = fp->next)
{
/* ignore the disabled ones */
if (!gdk_pixbuf_format_is_disabled ((GdkPixbufFormat*)fp->data))
{
/* get a list of MIME types supported by this format */
format_types = gdk_pixbuf_format_get_mime_types ((GdkPixbufFormat*)fp->data);
/* put them all in the unqiue MIME type hash table */
for (n = 0; format_types != NULL && format_types[n] != NULL; ++n)
{
mime_types.push_back(format_types[n]);
}
/* free the string array */
g_strfreev (format_types);
}
}
Thumbnailer::Ptr thumbnailer(new GdkTextureThumbnailer("gdk_pixelbuffer"));
ThumbnailGenerator::RegisterThumbnailer(mime_types, thumbnailer);
}
} // namespace TextureThumbnailProvider
} // namespace unity
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