使用xlib将图像加载到窗口上

问题描述：

我已经创建了窗口类，我想插入一个图像作为该窗口的背景。文件格式需要是png。我用magick ++的XImage来加载图像。但不知道如何将其作为我窗口的背景。知道怎么做吗？

I've created window class and i want to insert an image as a background of that window. File formats need to be png. I used XImage of magick++ to load an image. but don't know how to make its as a background of my window. Any idea how to do it?

答

使用

Pixmap XCreatePixmap(display, d, width, height, depth)
      Display *display; // The display
      Drawable d;       // The Window for which to set the background

为Pixmap创建图形上下文

Create a Graphics Context for the Pixmap

GC XCreateGC(display, d, valuemask, values)

将XImage绘制到Pixmap

Draw the XImage to the Pixmap

XPutImage(display, pixmap, gc, image, src_x, src_y, dest_x, dest_y, width, height)
        Drawable d; // The Pixmap
        XImage *image; // your XImage

最后将Pixmap设置为窗口的背景

Finally set the Pixmap as the window's background

XSetWindowBackgroundPixmap(display, w, background_pixmap)
      Display *display;
      Window w;
      Pixmap background_pixmap;

然后释放不再需要的所有资源。

Then free all resources no longer needed.

使用xlib将图像加载到窗口上

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