在Linux/Xorg上设置颜色亮度

Question

是否有任何命令(或API)来设置X.Org/Linux颜色亮度？

换句话说,我需要像xgamma命令一样方便的东西,但实时改变RGB亮度.

这可能吗？

Answer 1

使用XF86VidMode*系列函数.

#include <X11/Xlib.h>
#include <X11/extensions/xf86vmode.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int main() {
    Display *display;
    int screen;
    int major, minor;
    int i;
    XF86VidModeGamma orig;

    display = XOpenDisplay(NULL);
    if (!display) return -1;
    screen = DefaultScreen(display);
    if (!XF86VidModeQueryVersion(display, &major, &minor)
            || major < 2 || major == 2 && minor < 0
            || !XF86VidModeGetGamma(display, screen, &orig)) {
        XCloseDisplay(display);
        return -1;
    }

    for (i = 0; i <= 32; i++) {
        XF86VidModeGamma gamma;
        gamma.red = exp2f(2 - fabs(i - 16) / 4);
        gamma.green = gamma.red;
        gamma.blue = gamma.red;
        if (!XF86VidModeSetGamma(display, screen, &gamma)) break;
        printf("gamma: %f %f %f", gamma.red, gamma.green, gamma.blue);
        if (!XF86VidModeGetGamma(display, screen, &gamma)) break;
        printf(" -> %f %f %f\n", gamma.red, gamma.green, gamma.blue);
        sleep(1);
    }
    XF86VidModeSetGamma(display, screen, &orig);
    XF86VidModeGetGamma(display, screen, &orig);

    XCloseDisplay(display);
    return 0;
}

这将伽马从0.25增加到4.0并返回,然后恢复原始伽玛.

或者你可以反复调用system("xgamma -gamma %f"),结果几乎相同.