我正在尝试做一些我认为非常简单的事情:使用XLib在简单的X窗口上绘制硬编码的XBM图像。我使用以下代码,但只在窗口的左上角而不是图像中获得黑色矩形。帮助
#include <stdio.h>
#include <stdlib.h>
#include <X11/Xlib.h>
/* From http://commons.wikimedia.org/wiki/File:2008-07-25_Geese_over_00.svg
Creative Commons BY-SA */
#define goose_width 32
#define goose_height 31
static const unsigned char goose_bits[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00, 0x1c,
0x00, 0x00, 0x00, 0x0e, 0x00, 0x00, 0x00, 0x0f, 0x00, 0x00, 0x80, 0x0f,
0x00, 0x00, 0xc0, 0x0f, 0x00, 0x00, 0xe0, 0x07, 0x00, 0x00, 0xe0, 0x07,
0x00, 0x00, 0xf0, 0x03, 0x00, 0x00, 0xf8, 0x01, 0x00, 0x00, 0xfc, 0x01,
0x00, 0x00, 0xfc, 0x01, 0x00, 0x07, 0xfe, 0x01, 0x10, 0x07, 0xff, 0x00,
0x78, 0x0e, 0xff, 0x00, 0x80, 0x9f, 0x7f, 0x00, 0x00, 0xfe, 0x3f, 0x00,
0x00, 0xfc, 0x1f, 0x00, 0x00, 0xf8, 0x1f, 0x00, 0x00, 0xf0, 0x0f, 0x00,
0x00, 0xe0, 0x3f, 0x00, 0x00, 0x80, 0xff, 0x01, 0x00, 0x00, 0xf8, 0x01,
0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00 };
void windowinit(Display *display, Window *window) {
int screennum = DefaultScreen(display);
long background = WhitePixel(display, screennum);
long foreground = BlackPixel(display, screennum);
*window = XCreateSimpleWindow(display, DefaultRootWindow(display), 10, 10, 800, 600, 2, foreground, background);
XMapRaised(display, *window);
XSync(display, False);
/* Register for events */
XSelectInput(display, *window, ButtonPressMask|ButtonReleaseMask|ExposureMask|ButtonMotionMask|KeyPressMask);
}
int main(void) {
Display* display;
Window window;
GC gc;
Pixmap i;
/* Open display from $DISPLAY, handle errors */
if(!(display = XOpenDisplay(NULL))) {
fprintf(stderr, "Cannot connect to X display\n");
return EXIT_FAILURE;
}
/* Set up window */
windowinit(display, &window);
/* Creat GC, handel errors */
if((int)(gc = XCreateGC(display, window, 0, 0)) < 0) {
fprintf(stderr, "XCreateGC: \n");
return EXIT_FAILURE;
}
/* Draw image -- why does this draw a black rectangle ?? */
i = XCreateBitmapFromData(display, DefaultRootWindow(display), goose_bits, goose_width, goose_height);
XCopyPlane(display, i, window, gc, 0, 0, goose_width, goose_height, 0, 0, 1);
XSync(display, False);
sleep(3);
/* Cleanup */
XFreeGC(display, gc);
XDestroyWindow(display, window);
XCloseDisplay(display);
return EXIT_SUCCESS;
}
答案 0 :(得分:1)
我发现了问题。我需要打电话:
XSetBackground(display,gc,WhitePixel(display,DefaultScreen(display)));