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rework FFT-graph, add pointer-position annotations

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* replace old Gdk graphics context with cairo drawing
* cache graph on an image-surface
* allow partial exposure
* add annotation overlay
This commit is contained in:
Robin Gareus 2016-07-24 12:59:52 +02:00
parent 46d2b03af0
commit 7897b750ea
2 changed files with 192 additions and 52 deletions
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13
gtk2_ardour/fft_graph.h
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@ -50,6 +50,9 @@ public:
void redraw ();
bool on_expose_event (GdkEventExpose* event);
bool on_motion_notify_event (GdkEventMotion*);
bool on_leave_notify_event (GdkEventCrossing*);
bool on_button_press_event (GdkEventButton*) { return true; }
void on_size_request (Gtk::Requisition* requisition);
void on_size_allocate (Gtk::Allocation & alloc);
@ -65,7 +68,7 @@ private:
void setWindowSize_internal (int windowSize);
int draw_scales (Glib::RefPtr<Gdk::Window> window);
int draw_scales (cairo_t*);
static const int minScaleWidth = 512;
static const int minScaleHeight = 420;
@ -75,15 +78,21 @@ private:
static const int v_margin = 12;
int currentScaleWidth;
Glib::RefPtr<Gdk::GC> graph_gc;
int width;
int height;
int _yoff;
int _ann_x;
int _ann_y;
cairo_rectangle_t _ann_area;
unsigned int _windowSize;
unsigned int _dataSize;
Glib::RefPtr<Pango::Layout> layout;
cairo_surface_t* _surface;
AnalysisWindow *_a_window;
fftwf_plan _plan;