From 30c59a00956142aafda87c0bdc71c46d1a2218ff Mon Sep 17 00:00:00 2001
From: Takamichi Horikawa <takamichiho@gmail.com>
Date: Mon, 27 Mar 2017 23:33:40 +0900
Subject: add oscilloscope view

---
 gtk/oscilloview.c | 83 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 gtk/oscilloview.c

(limited to 'gtk/oscilloview.c')

diff --git a/gtk/oscilloview.c b/gtk/oscilloview.c
new file mode 100644
index 0000000..724ada9
--- /dev/null
+++ b/gtk/oscilloview.c
@@ -0,0 +1,83 @@
+#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,
+  WIDTH = 600,
+  HEIGHT = 300,
+};
+
+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;
+  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);
+  gtk_widget_set_size_request(drawarea, WIDTH*3, HEIGHT*3);
+  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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