From b55b46fa07bdd92209d0d954fba1aa7d864e2607 Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@lukeshu.com>
Date: Tue, 29 Aug 2017 18:30:02 -0400
Subject: switch to a polling approach, because GtkCurve doesn't do useful
 signals

---
 ggamma.c | 110 +++++++++++++++++++++++++++++++--------------------------------
 1 file changed, 55 insertions(+), 55 deletions(-)

diff --git a/ggamma.c b/ggamma.c
index a30c9b7..de0192e 100644
--- a/ggamma.c
+++ b/ggamma.c
@@ -10,56 +10,70 @@
 
 #define UNUSED __attribute__((unused))
 
-struct gamma_channel {
-	int size;
-	uint16_t *data;
-	void (*flush)(void);
-};
+/* Technically, the range of the curve should be [0,2¹⁶), but the X
+ * server will just divide it to fit in [0,gamma_size).  So there's no
+ * point in making it awkwardly tall to get the extra precision; just
+ * make it a square, we're not really loosing anything. */
+
+void gtkgamma_set(GtkGammaCurve *widget, int gamma_size, uint16_t *gamma_chan) {
+	gfloat vec[gamma_size];
+
+	for (int i = 0; i < gamma_size; i++)
+		vec[i] = gamma_chan[i] * gamma_size / 65535.0;
+	gtk_curve_set_vector(GTK_CURVE(widget->curve),
+	                     gamma_size, vec);
+}
 
-void curve_edited(GtkWidget *raw_curve, UNUSED GdkEvent *event, struct gamma_channel *gamma) {
-	gfloat vec[gamma->size];
+gboolean gtkgamma_get(GtkGammaCurve *widget, int gamma_size, uint16_t *gamma_chan) {
+	gfloat vec[gamma_size];
 	gboolean dirty = FALSE;
 
-	gtk_curve_get_vector(GTK_CURVE(raw_curve), gamma->size, vec);
-	for (int i = 0; i < gamma->size; i++) {
-		uint16_t y = vec[i] * 65535.0 / gamma->size;
-		if (y != gamma->data[i]) {
-			gamma->data[i] = y;
+	gtk_curve_get_vector(GTK_CURVE(widget->curve), gamma_size, vec);
+	for (int i = 0; i < gamma_size; i++) {
+		uint16_t y = vec[i] * 65535.0 / gamma_size;
+		if (y != gamma_chan[i]) {
+			gamma_chan[i] = y;
 			dirty = TRUE;
 		}
 	}
-
-	if (dirty && gamma->flush)
-		gamma->flush();
+	return dirty;
 }
 
-void curve_set(GtkGammaCurve *curve, struct gamma_channel *gamma) {
-	gfloat vec[gamma->size];
-	for (int i = 0; i < gamma->size; i++)
-		vec[i] = gamma->data[i] * gamma->size / 65535.0;
-	gtk_curve_set_vector(GTK_CURVE(curve->curve),
-	                     gamma->size, vec);
+struct gtkgamma_data {
+	GtkGammaCurve *widget;
+	int gamma_size;
+	uint16_t *gamma_chan;
+	void (*cb)(void);
+	guint poll_id;
+};
+
+gboolean _gtkgamma_poll(struct gtkgamma_data *data) {
+	if (gtkgamma_get(data->widget, data->gamma_size, data->gamma_chan) && data->cb)
+		data->cb();
+	return TRUE;
 }
+void _gtkgamma_destroy(UNUSED GtkObject *object, struct gtkgamma_data *data) {
+	g_source_remove(data->poll_id);
+	free(data);
+}
+GtkWidget *gtkgamma_new(int gamma_size, uint16_t *gamma_chan, void (*cb)(void)) {
+	GtkGammaCurve *widget = GTK_GAMMA_CURVE(gtk_gamma_curve_new());
 
-GtkWidget *curve_new(struct gamma_channel *gamma) {
-	GtkWidget *curve = gtk_gamma_curve_new();
-	GtkWidget *raw_curve = GTK_GAMMA_CURVE(curve)->curve;
-			
-	/* Technically, the range of the curve should be [0,2¹⁶), but
-	 * the X server will just divide it to fit in [0,gamma_size).
-	 * So there's no point in making it awkwardly tall to get the
-	 * extra precision; just make it a square, we're not really
-	 * loosing anything. */
-	gtk_curve_set_range(GTK_CURVE(raw_curve),
-	                    /* x */0, gamma->size-1,
-	                    /* y */0, gamma->size-1);
+	gtk_curve_set_range(GTK_CURVE(widget->curve),
+	                    /* x */0, gamma_size-1,
+	                    /* y */0, gamma_size-1);
 
-	curve_set(GTK_GAMMA_CURVE(curve), gamma);
+	gtkgamma_set(widget, gamma_size, gamma_chan);
 
-	// TODO: find a better signal
-	g_signal_connect(raw_curve, "event-after", G_CALLBACK(curve_edited), gamma);
+	struct gtkgamma_data *data = malloc(sizeof(struct gtkgamma_data));
+	data->widget = widget;
+	data->gamma_size = gamma_size;
+	data->gamma_chan = gamma_chan;
+	data->cb = cb;
+	data->poll_id = g_timeout_add(100, (gboolean (*)(gpointer))_gtkgamma_poll, data);
+	g_signal_connect(widget, "destroy", G_CALLBACK(_gtkgamma_destroy), data);
 
-	return curve;
+	return GTK_WIDGET(widget);
 }
 
 int main(int argc, char *argv[]) {
@@ -108,36 +122,22 @@ int main(int argc, char *argv[]) {
 	void flush(void) {
 		XRRSetCrtcGamma(display, crtc, gamma);
 	}
+	GtkWidget *curve;
 
 	/* start red */
-	struct gamma_channel r = {
-		.size = gamma_size,
-		.data = gamma->red,
-		.flush = flush,
-	};
-	GtkWidget *curve = curve_new(&r);
+	curve = gtkgamma_new(gamma_size, gamma->red, flush);
 	gtk_container_add(GTK_CONTAINER(layout), curve);
 	gtk_widget_show(curve);
 	/* end red */
 
 	/* start green */
-	struct gamma_channel g = {
-		.size = gamma_size,
-		.data = gamma->green,
-		.flush = flush,
-	};
-	curve = curve_new(&g);
+	curve = gtkgamma_new(gamma_size, gamma->green, flush);
 	gtk_container_add(GTK_CONTAINER(layout), curve);
 	gtk_widget_show(curve);
 	/* end green */
 
 	/* start blue */
-	struct gamma_channel b = {
-		.size = gamma_size,
-		.data = gamma->blue,
-		.flush = flush,
-	};
-	curve = curve_new(&b);
+	curve = gtkgamma_new(gamma_size, gamma->blue, flush);
 	gtk_container_add(GTK_CONTAINER(layout), curve);
 	gtk_widget_show(curve);
 	/* end blue */
-- 
cgit v1.2.3