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/* libgnomecanvas/gnome-canvas-waveview.h: GnomeCanvas item for displaying wave data
*
* Copyright (C) 2001 Paul Davis <pbd@op.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
*/
#ifndef __GNOME_CANVAS_WAVEVIEW_H__
#define __GNOME_CANVAS_WAVEVIEW_H__
#include <stdint.h>
#include <libgnomecanvas/libgnomecanvas.h>
G_BEGIN_DECLS
/* Wave viewer item for canvas.
*/
#define GNOME_TYPE_CANVAS_WAVEVIEW (gnome_canvas_waveview_get_type ())
#define GNOME_CANVAS_WAVEVIEW(obj) (GTK_CHECK_CAST ((obj), GNOME_TYPE_CANVAS_WAVEVIEW, GnomeCanvasWaveView))
#define GNOME_CANVAS_WAVEVIEW_CLASS(klass) (GTK_CHECK_CLASS_CAST ((klass), GNOME_TYPE_CANVAS_WAVEVIEW, GnomeCanvasWaveViewClass))
#define GNOME_IS_CANVAS_WAVEVIEW(obj) (GTK_CHECK_TYPE ((obj), GNOME_TYPE_CANVAS_WAVEVIEW))
#define GNOME_IS_CANVAS_WAVEVIEW_CLASS(klass) (GTK_CHECK_CLASS_TYPE ((klass), GNOME_TYPE_CANVAS_WAVEVIEW))
#define GNOME_CANVAS_WAVEVIEW_GET_CLASS(obj) (GTK_CHECK_GET_CLASS ((obj), GNOME_TYPE_CANVAS_WAVEVIEW, GnomeCanvasWaveViewClass))
typedef struct _GnomeCanvasWaveView GnomeCanvasWaveView;
typedef struct _GnomeCanvasWaveViewClass GnomeCanvasWaveViewClass;
typedef struct _GnomeCanvasWaveViewChannelInfo GnomeCanvasWaveViewChannelInfo;
typedef struct _GnomeCanvasWaveViewCacheEntry GnomeCanvasWaveViewCacheEntry;
typedef struct _GnomeCanvasWaveViewCache GnomeCanvasWaveViewCache;
/* XXX this needs to be synced with ardour/source.h PeakData */
struct _GnomeCanvasWaveViewCacheEntry
{
float min;
float max;
};
struct _GnomeCanvasWaveViewCache
{
GnomeCanvasWaveViewCacheEntry* data;
gint32 allocated;
gint32 data_size;
gulong start;
gulong end;
};
GnomeCanvasWaveViewCache* gnome_canvas_waveview_cache_new ();
void gnome_canvas_waveview_cache_destroy (GnomeCanvasWaveViewCache*);
struct _GnomeCanvasWaveView
{
GnomeCanvasItem item;
GnomeCanvasWaveViewCache *cache;
gboolean cache_updater;
gint screen_width;
void *data_src;
guint32 channel;
void (*peak_function)(void*,gulong,gulong,gulong,gpointer,guint32,double);
gulong (*length_function)(void *);
gulong (*sourcefile_length_function)(void*,double);
void (*gain_curve_function)(void *arg, double start, double end, float* vector, guint32 veclen);
void *gain_src;
/** x-axis: samples per canvas unit. */
double samples_per_unit;
/** y-axis: amplitude_above_axis.
*
* the default is that an (scaled, normalized -1.0 ... +1.0) amplitude of 1.0
* corresponds to the top of the area assigned to the waveview.
*
* larger values will expand the vertical scale, cutting off the peaks/troughs.
* smaller values will decrease the vertical scale, moving peaks/troughs toward
* the middle of the area assigned to the waveview.
*/
double amplitude_above_axis;
double x;
double y;
double height;
double half_height;
uint32_t wave_color;
char rectified;
/* These are updated by the update() routine
to optimize the render() routine, which may
be called several times after a single update().
*/
int32_t bbox_ulx;
int32_t bbox_uly;
int32_t bbox_lrx;
int32_t bbox_lry;
unsigned char wave_r, wave_g, wave_b, wave_a;
uint32_t samples;
uint32_t region_start;
int32_t reload_cache_in_render;
};
struct _GnomeCanvasWaveViewClass {
GnomeCanvasItemClass parent_class;
};
GType gnome_canvas_waveview_get_type (void) G_GNUC_CONST;
G_END_DECLS
#endif /* __GNOME_CANVAS_WAVEVIEW_H__ */
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