gtk2_ardour/canvas-waveview.h

   1 /* libgnomecanvas/gnome-canvas-waveview.h: GnomeCanvas item for displaying wave data
   2  *
   3  * Copyright (C) 2001 Paul Davis <pbd@op.net>
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Library General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Library General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Library General Public
  16  * License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  *
  20  */
  21
  22 #ifndef __GNOME_CANVAS_WAVEVIEW_H__
  23 #define __GNOME_CANVAS_WAVEVIEW_H__
  24
  25 #include <stdint.h>
  26
  27 #include <libgnomecanvas/libgnomecanvas.h>
  28
  29 G_BEGIN_DECLS
  30
  31 /* Wave viewer item for canvas.
  32  */
  33
  34 #define GNOME_TYPE_CANVAS_WAVEVIEW            (gnome_canvas_waveview_get_type ())
  35 #define GNOME_CANVAS_WAVEVIEW(obj)            (GTK_CHECK_CAST ((obj), GNOME_TYPE_CANVAS_WAVEVIEW, GnomeCanvasWaveView))
  36 #define GNOME_CANVAS_WAVEVIEW_CLASS(klass)    (GTK_CHECK_CLASS_CAST ((klass), GNOME_TYPE_CANVAS_WAVEVIEW, GnomeCanvasWaveViewClass))
  37 #define GNOME_IS_CANVAS_WAVEVIEW(obj)         (GTK_CHECK_TYPE ((obj), GNOME_TYPE_CANVAS_WAVEVIEW))
  38 #define GNOME_IS_CANVAS_WAVEVIEW_CLASS(klass) (GTK_CHECK_CLASS_TYPE ((klass), GNOME_TYPE_CANVAS_WAVEVIEW))
  39 #define GNOME_CANVAS_WAVEVIEW_GET_CLASS(obj)  (GTK_CHECK_GET_CLASS ((obj), GNOME_TYPE_CANVAS_WAVEVIEW, GnomeCanvasWaveViewClass))
  40
  41 typedef struct _GnomeCanvasWaveView            GnomeCanvasWaveView;
  42 typedef struct _GnomeCanvasWaveViewClass       GnomeCanvasWaveViewClass;
  43 typedef struct _GnomeCanvasWaveViewChannelInfo GnomeCanvasWaveViewChannelInfo;
  44 typedef struct _GnomeCanvasWaveViewCacheEntry  GnomeCanvasWaveViewCacheEntry;
  45 typedef struct _GnomeCanvasWaveViewCache       GnomeCanvasWaveViewCache;
  46
  47 /* XXX this needs to be synced with ardour/source.h PeakData */
  48
  49 struct _GnomeCanvasWaveViewCacheEntry
  50 {
  51     float  min;
  52     float  max;
  53 };
  54
  55 struct _GnomeCanvasWaveViewCache
  56 {
  57     GnomeCanvasWaveViewCacheEntry* data;
  58     gint32                       allocated;
  59     gint64                       data_size;
  60     gulong                       start;
  61     gulong                       end;
  62 };
  63
  64 GnomeCanvasWaveViewCache* gnome_canvas_waveview_cache_new ();
  65 void                    gnome_canvas_waveview_cache_destroy (GnomeCanvasWaveViewCache*);
  66
  67 struct _GnomeCanvasWaveView
  68 {
  69     GnomeCanvasItem item;
  70
  71     GnomeCanvasWaveViewCache *cache;
  72     gboolean                cache_updater;
  73     gint                    screen_width;
  74
  75     void *data_src;
  76     guint32 channel;
  77         void (*peak_function)(void*,gulong,gulong,gulong,gpointer,guint32,double);
  78     gulong (*length_function)(void *);
  79     gulong (*sourcefile_length_function)(void*,double);
  80     void (*gain_curve_function)(void *arg, double start, double end, float* vector, gint64 veclen);
  81     void *gain_src;
  82
  83     /** x-axis: samples per canvas unit. */
  84     double samples_per_unit;
  85
  86     /** y-axis: amplitude_above_axis.
  87      *
  88      * the default is that an (scaled, normalized -1.0 ... +1.0) amplitude of 1.0
  89      * corresponds to the top of the area assigned to the waveview.
  90      *
  91      * larger values will expand the vertical scale, cutting off the peaks/troughs.
  92      * smaller values will decrease the vertical scale, moving peaks/troughs toward
  93      * the middle of the area assigned to the waveview.
  94      */
  95     double amplitude_above_axis;
  96
  97     double x;
  98     double y;
  99     double height;
 100     double half_height;
 101     uint32_t wave_color;
 102     uint32_t clip_color;
 103     uint32_t zero_color;
 104     uint32_t fill_color;
 105
 106     char filled;
 107     char rectified;
 108     char zero_line;
 109     char logscaled;
 110
 111     /* These are updated by the update() routine
 112        to optimize the render() routine, which may
 113        be called several times after a single update().
 114     */
 115
 116     int32_t bbox_ulx;
 117     int32_t bbox_uly;
 118     int32_t bbox_lrx;
 119     int32_t bbox_lry;
 120     unsigned char wave_r, wave_g, wave_b, wave_a;
 121     unsigned char clip_r, clip_g, clip_b, clip_a;
 122     unsigned char fill_r, fill_g, fill_b, fill_a;
 123     uint32_t samples;
 124     uint32_t region_start;
 125     int32_t reload_cache_in_render;
 126 };
 127
 128 struct _GnomeCanvasWaveViewClass {
 129         GnomeCanvasItemClass parent_class;
 130 };
 131
 132 GType gnome_canvas_waveview_get_type (void) G_GNUC_CONST;
 133
 134 G_END_DECLS
 135
 136 #endif /* __GNOME_CANVAS_WAVEVIEW_H__ */