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bitmap_source.h
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2008-08-04
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#ifndef K3DSDK_BITMAP_SOURCE_H
#define K3DSDK_BITMAP_SOURCE_H
// K-3D
// Copyright (c) 1995-2008, Timothy M. Shead
//
// Contact: tshead@k-3d.com
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This program 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
// General Public License for more details.
//
// You should have received a copy of the GNU General Public
// License along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#include "bitmap.h"
#include "data.h"
#include "hints.h"
#include "ibitmap_source.h"
#include "ipipeline_profiler.h"
#include "k3d-i18n-config.h"
#include "pointer_demand_storage.h"
namespace k3d
{
/// Boilerplate CRTP class for bitmap source objects that produce a k3d::bitmap* as output.
template<typename derived_t>
class bitmap_source :
public ibitmap_source
{
public:
iproperty& bitmap_source_output()
{
return m_output_bitmap;
}
/// Returns a slot that should be connected to input properties to signal that the output bitmap has changed.
sigc::slot<void, ihint*> make_update_bitmap_slot()
{
return m_output_bitmap.make_slot();
}
protected:
bitmap_source() :
m_output_bitmap(
init_owner(owner())
+ init_name("output_bitmap")
+ init_label(_("Output Bitmap"))
+ init_description(_("Output bitmap")))
{
m_output_bitmap.set_update_slot(sigc::mem_fun(*this, &bitmap_source<derived_t>::execute));
}
/// Stores the output bitmap, which is created on-demand.
k3d_data(bitmap*, immutable_name, change_signal, no_undo, pointer_demand_storage, no_constraint, read_only_property, no_serialization) m_output_bitmap;
private:
inline derived_t& owner()
{
return *static_cast<derived_t*>(this);
}
/// Called whenever the output bitmap has been modified and needs to be updated.
void execute(const std::vector<ihint*>& Hints, bitmap& Bitmap)
{
bool_t resize_bitmap = false;
bool_t assign_pixels = false;
for(uint_t i = 0; i != Hints.size(); ++i)
{
// Input pixels changed, so all we have to do is reassign ours ...
if(dynamic_cast<hint::bitmap_pixels_changed*>(Hints[i]))
{
assign_pixels = true;
}
// In every other case (bitmap_dimensions_changed, unknown hint, or no hint),
// we must assume the worst and recreate everything from scratch ...
else
{
resize_bitmap = true;
assign_pixels = true;
break;
}
}
if(resize_bitmap)
{
owner().document().pipeline_profiler().start_execution(owner(), "Resize Bitmap");
on_resize_bitmap(Bitmap);
owner().document().pipeline_profiler().finish_execution(owner(), "Resize Bitmap");
}
if(assign_pixels)
{
owner().document().pipeline_profiler().start_execution(owner(), "Assign Pixels");
on_assign_pixels(Bitmap);
owner().document().pipeline_profiler().finish_execution(owner(), "Assign Pixels");
}
}
/// Implement this in derived classes to set the size of the output bitmap.
virtual void on_resize_bitmap(bitmap& Output) = 0;
/// Implement this in derived classes to assign values to each output pixel.
virtual void on_assign_pixels(bitmap& Output) = 0;
};
} // namespace k3d
#endif // !K3DSDK_BITMAP_SOURCE_H