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#include <gtk/gtk.h>
#include <cairo.h>
#include "oscilloview.h"
#include <string.h>
struct oscilloview oscilloview_g = {
.flag = ATOMIC_FLAG_INIT
};
enum {
VIEW_SAMPLES = 1024,
VIEW_SKIP = 2,
};
static struct {
GtkWidget *win;
struct oscillodata oscillodata[LIBOPNA_OSCILLO_TRACK_COUNT];
} g;
static void on_destroy(GtkWidget *w, gpointer ptr) {
(void)w;
(void)ptr;
g.win = 0;
}
static void draw_track(cairo_t *cr,
double x, double y, double w, double h,
const struct oscillodata *data) {
int start = OSCILLO_SAMPLE_COUNT - VIEW_SAMPLES;
start -= (data->offset >> OSCILLO_OFFSET_SHIFT);
if (start < 0) start = 0;
for (int i = 0; i < (VIEW_SAMPLES / VIEW_SKIP); i++) {
cairo_line_to(cr, x + ((i)*w)/(VIEW_SAMPLES / VIEW_SKIP), y + h/2.0 - (data[0].buf[start + i*VIEW_SKIP] / 16384.0) * h/2);
}
cairo_stroke(cr);
}
static gboolean draw_cb(GtkWidget *w,
cairo_t *cr,
gpointer ptr) {
(void)w;
(void)ptr;
guint width = gtk_widget_get_allocated_width(w) / 3u;
guint height = gtk_widget_get_allocated_height(w) / 3u;
cairo_set_antialias(cr, CAIRO_ANTIALIAS_NONE);
if (!atomic_flag_test_and_set_explicit(
&oscilloview_g.flag, memory_order_acquire)) {
memcpy(g.oscillodata,
oscilloview_g.oscillodata,
sizeof(oscilloview_g.oscillodata));
atomic_flag_clear_explicit(&oscilloview_g.flag, memory_order_release);
}
cairo_set_source_rgb(cr, 0.0, 0.0, 0.0);
cairo_paint(cr);
cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);
for (int x = 0; x < 3; x++) {
for (int y = 0; y < 3; y++) {
draw_track(cr, x*width, y*height, width, height, &g.oscillodata[x*3+y]);
}
}
return FALSE;
}
static gboolean tick_cb(GtkWidget *w, GdkFrameClock *clock, gpointer ptr) {
(void)clock;
(void)ptr;
gtk_widget_queue_draw(w);
return G_SOURCE_CONTINUE;
}
void show_oscilloview(void) {
if (!g.win) {
g.win = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_title(GTK_WINDOW(g.win), "Oscilloscope view");
g_signal_connect(g.win, "destroy", G_CALLBACK(on_destroy), 0);
GtkWidget *drawarea = gtk_drawing_area_new();
gtk_container_add(GTK_CONTAINER(g.win), drawarea);
g_signal_connect(drawarea, "draw", G_CALLBACK(draw_cb), 0);
gtk_widget_add_tick_callback(drawarea, tick_cb, 0, 0);
}
gtk_widget_show_all(g.win);
}
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