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#include <stdlib.h> /* for getenv(3) */
#include <error.h> /* for error(3) */
#include <stdint.h> /* for uint16_t */
#include <stdio.h>
#include <X11/Xlib.h> /* for Display, XOpenDisplay(3) */
#include <X11/extensions/Xrandr.h> /* for XRRQueryExtension(3) */
#include <gtk/gtk.h>
#define UNUSED __attribute__((unused))
struct curve_data {
int gamma_size;
void (*cb)(uint16_t *ivec);
};
void curve_handle_update(GtkWidget *raw_curve, UNUSED GdkEvent *event, struct curve_data *data) {
gfloat fvec[data->gamma_size];
uint16_t ivec[data->gamma_size];
gtk_curve_get_vector(GTK_CURVE(raw_curve), data->gamma_size, fvec);
for (int i = 0; i < data->gamma_size; i++)
ivec[i] = (uint16_t)(fvec[i] * 65535.0 / data->gamma_size);
if (data->cb)
data->cb(ivec);
}
GtkWidget *curve_new(int gamma_size, uint16_t *ivec, void (*cb)(uint16_t *ivec)) {
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);
gfloat fvec[gamma_size];
for (int i = 0; i < gamma_size; i++)
fvec[i] = ivec[i] * gamma_size / 65535.0;
gtk_curve_set_vector(GTK_CURVE(raw_curve),
gamma_size, fvec);
// TODO: this memory gets leaked
struct curve_data *data = malloc(sizeof(struct curve_data));
data->gamma_size = gamma_size;
data->cb = cb;
// TODO: find a better signal
g_signal_connect(raw_curve, "event-after", G_CALLBACK(curve_handle_update), data);
return curve;
}
int main(int argc, char *argv[]) {
char *display_name = getenv("DISPLAY");
GError *err = NULL;
GOptionEntry options[] = {
{"display", 'd', G_OPTION_FLAG_NONE, G_OPTION_ARG_STRING, &display_name, "X display to set gamma for", "DISPLAY"},
{0},
};
if (!gtk_init_with_args(&argc, &argv, "", options, NULL, &err))
error(1, 0, "Unable to initialize GTK+: %s", err->message);
Display *display = XOpenDisplay(display_name);
if (!display)
error(1, 0, "Cannot open target display %s", display_name);
/* RRGetScreenResources[Current] takes a Window, and operates
* on the Screen associated with that Window, because taking
* the Screen itself as an argument just makes too much
* sense. */
XRRScreenResources *res = XRRGetScreenResourcesCurrent(display, RootWindow(display, DefaultScreen(display)));
if (res->ncrtc < 1)
error(1, 0, "There aren't any CRTCs on display %s's default screen (%d)", display_name, DefaultScreen(display));
for (int i = 0; i < res->ncrtc; i++) {
RRCrtc crtc = res->crtcs[i];
printf("crtc xid: %ld gamma_size: %d\n", crtc, XRRGetCrtcGammaSize(display, crtc));
}
RRCrtc crtc = res->crtcs[0]; // TODO: real CTRC selection
int gamma_size = XRRGetCrtcGammaSize(display, crtc);
XRRCrtcGamma *gamma = XRRAllocGamma(gamma_size);
{ GtkWidget *window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_resizable(GTK_WINDOW(window), FALSE);
g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);
// TODO: add a xrandr(1) emulation pane
{ GtkWidget *layout = gtk_hbox_new(TRUE, 0);
gtk_container_add(GTK_CONTAINER(window), layout);
gtk_widget_show(layout);
XRRCrtcGamma *orig_gamma = XRRGetCrtcGamma(display, crtc);
/* red */
{
void set_red(uint16_t *vec) {
for (int i = 0; i < gamma_size; i++)
gamma->red[i] = vec[i];
XRRSetCrtcGamma(display, crtc, gamma);
}
GtkWidget *curve = curve_new(gamma_size, orig_gamma->red, set_red);
gtk_container_add(GTK_CONTAINER(layout), curve);
gtk_widget_show(curve);
}
/* green */
{
void set_green(uint16_t *vec) {
for (int i = 0; i < gamma_size; i++)
gamma->green[i] = vec[i];
XRRSetCrtcGamma(display, crtc, gamma);
}
GtkWidget *curve = curve_new(gamma_size, orig_gamma->green, set_green);
gtk_container_add(GTK_CONTAINER(layout), curve);
gtk_widget_show(curve);
}
/* blue */
{
void set_blue(uint16_t *vec) {
for (int i = 0; i < gamma_size; i++)
gamma->blue[i] = vec[i];
XRRSetCrtcGamma(display, crtc, gamma);
}
GtkWidget *curve = curve_new(gamma_size, orig_gamma->blue, set_blue);
gtk_container_add(GTK_CONTAINER(layout), curve);
gtk_widget_show(curve);
}
XRRFreeGamma(orig_gamma);
}
gtk_widget_show(window);
}
gtk_main();
XFree(gamma);
XCloseDisplay(display);
return 0;
}
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