livetrax/gtk2_ardour/imageframe_view.cc

/*
    Copyright (C) 2003 Paul Davis

    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., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#include <algorithm>
#include <cmath>

#include <gtkmm.h>
#include <gtkmm2ext/gtk_ui.h>

#include "imageframe_time_axis.h"
#include "imageframe_time_axis_group.h"
#include "marker_time_axis.h"
#include "marker_time_axis_view.h"
#include "public_editor.h"
#include "utils.h"
#include "imageframe_view.h"
#include "imageframe.h"
#include "canvas_impl.h"
#include "gui_thread.h"

using namespace ARDOUR;
using namespace Gtk;

sigc::signal<void,ImageFrameView*> ImageFrameView::GoingAway;

/**
 * Constructs a new ImageFrameView upon the canvas
 *
 * @param item_id unique id of this item
 * @param parent the parent canvas item
 * @param tv the time axis view that this item is to be placed upon
 * @param group the ImageFrameGroup that this item is a member of
 * @param spu the current samples per canvas unit
 * @param start the start frame ogf this item
 * @param duration the duration of this item
 * @param rgb_data the rgb data of the image
 * @param width the width of the original rgb_data image data
 * @param height the width of the origianl rgb_data image data
 * @param num_channels the number of color channels within rgb_data
 */
ImageFrameView::ImageFrameView(const string & item_id,
	ArdourCanvas::Group *parent,
	ImageFrameTimeAxis* tv,
	ImageFrameTimeAxisGroup* item_group,
	double spu,
       Gdk::Color& basic_color,
	framepos_t start,
	framecnt_t duration,
	unsigned char* rgb_data,
	uint32_t width,
	uint32_t height,
	uint32_t num_channels)
  : TimeAxisViewItem(item_id, *parent, *tv, spu, basic_color, start, duration,
		     TimeAxisViewItem::Visibility (TimeAxisViewItem::ShowNameText|
						   TimeAxisViewItem::ShowNameHighlight|
						   TimeAxisViewItem::ShowFrame|
						   TimeAxisViewItem::ShowHandles))

{
	the_parent_group = item_group;
	set_name_text(item_id);

	image_data_width = width;
	image_data_height = height;
	image_data_num_channels = num_channels;

	//This should be art_free'd once the ArtPixBuf is destroyed - this should happen when we destroy the imageframe canvas item
	unsigned char* the_rgb_data = (unsigned char*) art_alloc(width*height*num_channels);
	memcpy(the_rgb_data, rgb_data, (width*height*num_channels));

	ArtPixBuf* pbuf;
	pbuf = art_pixbuf_new_rgba(the_rgb_data, width, height, (num_channels * width));
	imageframe = 0;

	//calculate our image width based on the track height
	double im_ratio = (double)width/(double)height;
	double im_width = ((double)(trackview.current_height() - TimeAxisViewItem::NAME_HIGHLIGHT_SIZE) * im_ratio);

	imageframe = new ImageFrame (*group, pbuf, 1.0, 1.0, ANCHOR_NW, im_width, (trackview.current_height() - TimeAxisViewItem::NAME_HIGHLIGHT_SIZE));

	frame_handle_start->signal_event().connect (sigc::bind (sigc::mem_fun (trackview.editor, &PublicEditor::canvas_imageframe_start_handle_event), frame_handle_start, this));
	frame_handle_end->signal_event().connect (sigc::bind (sigc::mem_fun (trackview.editor, &PublicEditor::canvas_imageframe_end_handle_event), frame_handle_end, this));
	group->signal_event().connect (sigc::bind (sigc::mem_fun (trackview.editor, &PublicEditor::canvas_imageframe_item_view_event), imageframe, this));

	frame_handle_start->raise_to_top();
	frame_handle_end->raise_to_top();

	set_position(start, this);
	set_duration(duration, this);

	MarkerView::CatchDeletion.connect (*this, boost::bind (&ImageFrameView::remove_marker_view_item, this, _1), gui_context());
}

/**
 * Destructor
 * Reposible for removing and destroying all marker items associated with this item
 */
ImageFrameView::~ImageFrameView()
{
	CatchDeletion (this);

	// destroy any marker items we have associated with this item

	for(MarkerViewList::iterator iter = marker_view_list.begin(); iter != marker_view_list.end(); ++iter)
	{
		MarkerView* mv = (*iter);

		MarkerViewList::iterator next = iter;
		next++;

		// remove the item from our marker list
		// the current iterator becomes invalid after this point, so we cannot call next upon it
		// luckily enough, we already have next
		marker_view_list.erase(iter);

		// remove the item from the marker time axis
		MarkerTimeAxisView* mtav = dynamic_cast<MarkerTimeAxis*>(&mv->get_time_axis_view())->get_view();
		if(mtav)
		{
			mtav->remove_marker_view(mv, this);
		}

		mv->set_marked_item(0);
		delete mv;
		mv = 0;

		// set our iterator to next, as we have invalided the current iterator with the call to erase
		iter = next;
	}

	// if we are the currently selected item withi the parent track, we need to se-select
	if(the_parent_group)
	{
		if(the_parent_group->get_view().get_selected_imageframe_view() == this)
		{
			the_parent_group->get_view().clear_selected_imageframe_item(false);
		}
	}

	delete imageframe;
	imageframe = 0;
}


//---------------------------------------------------------------------------------------//
// Position and duration Accessors/Mutators

/**
 * Set the position of this item to the specified value
 *
 * @param pos the new position
 * @param src the identity of the object that initiated the change
 * @return true if the position change was a success, false otherwise
 */
bool
ImageFrameView::set_position(framepos_t pos, void* src, double* delta)
{
	framepos_t old_pos = frame_position;

	// do the standard stuff
	bool ret = TimeAxisViewItem::set_position(pos, src, delta);

	// everything went ok with the standard stuff?
 	if (ret) {
		/* move each of our associated markers with this ImageFrameView */
		for (MarkerViewList::iterator i = marker_view_list.begin(); i != marker_view_list.end(); ++i)
		{
			// calculate the offset of the marker
			MarkerView* mv = (MarkerView*)*i;
			framepos_t marker_old_pos = mv->get_position();

			mv->set_position(pos + (marker_old_pos - old_pos), src);
		}
	}

	return(ret);
}

/**
 * Sets the duration of this item
 *
 * @param dur the new duration of this item
 * @param src the identity of the object that initiated the change
 * @return true if the duration change was succesful, false otherwise
 */
bool
ImageFrameView::set_duration(framepos_t dur, void* src)
{
	/* do the standard stuff */
	bool ret = TimeAxisViewItem::set_duration(dur, src);

	// eveything went ok with the standard stuff?
	if(ret)
	{
		/* handle setting the sizes of our canvas itesm based on the new duration */
		imageframe->property_drawwidth() = trackview.editor.frame_to_pixel(get_duration());
	}

	return(ret);
}

//---------------------------------------------------------------------------------------//
// Parent Component Methods

/**
 * Sets the parent ImageFrameTimeAxisGroup of thie item
 * each Item must be part of exactly one group (or 'scene') upon the timeline
 *
 * @param group the new parent group
 */
void
ImageFrameView::set_time_axis_group(ImageFrameTimeAxisGroup* group)
{
	the_parent_group = group;
}

/**
 * Returns the parent group of this item
 *
 * @return the parent group of this item
 */
ImageFrameTimeAxisGroup*
ImageFrameView::get_time_axis_group()
{
	return(the_parent_group);
}


//---------------------------------------------------------------------------------------//
// ui methods

/**
 * Set the height of this item
 *
 * @param h the new height
 */
void
ImageFrameView::set_height (gdouble h)
{
	// set the image size
	// @todo might have to re-get the image data, for a large height...hmmm.
	double im_ratio = (double)image_data_width/(double)image_data_height;

	imageframe->property_width() = (h - TimeAxisViewItem::NAME_Y_OFFSET) * im_ratio;
	imageframe->property_height() = h - TimeAxisViewItem::NAME_Y_OFFSET;

	frame->raise_to_top();
	imageframe->raise_to_top();
	name_highlight->raise_to_top();
	name_pixbuf->raise_to_top();
	frame_handle_start->raise_to_top();
	frame_handle_end->raise_to_top();

	name_pixbuf->property_y() = h - TimeAxisViewItem::NAME_Y_OFFSET;
	frame->property_y2() = h;

	name_highlight->property_y1() = (gdouble) h - TimeAxisViewItem::NAME_HIGHLIGHT_SIZE;
	name_highlight->property_y2() = (gdouble) h - 1.0;
}


//---------------------------------------------------------------------------------------//
// MarkerView methods

/**
 * Adds a markerView to the list of marker views associated with this item
 *
 * @param item the marker item to add
 * @param src the identity of the object that initiated the change
 */
void
ImageFrameView::add_marker_view_item(MarkerView* item, void* src)
{
	marker_view_list.push_back(item);
	 MarkerViewAdded(item, src); /* EMIT_SIGNAL */
}

/**
 * Removes the named marker view from the list of marker view associated with this item
 * The Marker view is not destroyed on removal, so the caller must handle the item themself
 *
 * @param markId the id/name of the item to remove
 * @param src the identity of the object that initiated the change
 * @return the removed marker item
 */
MarkerView*
ImageFrameView::remove_named_marker_view_item(const string & markerId, void* src)
{
	MarkerView* mv = 0;
	MarkerViewList::iterator i = marker_view_list.begin();

	while(i != marker_view_list.end())
	{
		if (((MarkerView*)*i)->get_item_name() == markerId)
		{
			mv = (*i);

			marker_view_list.erase(i);

			 MarkerViewRemoved(mv,src); /* EMIT_SIGNAL */

			// iterator is now invalid, but since we should only ever have
			// one item with the specified name, things are ok, and we can
			// break from the while loop
			break;
		}
		i++;
	}

	return(mv);
}

/**
 * Removes item from the list of marker views assocaited with this item
 * This method will do nothing if item if not assiciated with this item
 *
 * @param item the item to remove
 * @param src the identity of the object that initiated the change
 */
void
ImageFrameView::remove_marker_view_item (MarkerView* mv)
{
	ENSURE_GUI_THREAD (*this, &ImageFrameView::remove_marker_view_item, mv, src)

	MarkerViewList::iterator i;

	if ((i = find (marker_view_list.begin(), marker_view_list.end(), mv)) != marker_view_list.end()) {
		marker_view_list.erase(i);
		MarkerViewRemoved (mv, src); /* EMIT_SIGNAL */
	}
}

/**
 * Determines if the named marker is one of those associated with this item
 *
 * @param markId the id/name of the item to search for
 */
bool
ImageFrameView::has_marker_view_item(const string & mname)
{
	bool result = false;

	for (MarkerViewList::const_iterator ci = marker_view_list.begin(); ci != marker_view_list.end(); ++ci)
	{
		if (((MarkerView*)*ci)->get_item_name() == mname)
		{
			result = true;

			// found the item, so we can break the for loop
			break;
		}
	}

	return(result);
}