GTK RGB图像绘制

源代码

#include <gtk/gtk.h>

#define WIDTH 300
#define HEIGHT 300

GtkWidget *window;
GdkPixbuf *pixbuf;
GtkWidget *image;

int main() {
    

    gtk_init(NULL, NULL);
    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_default_size(GTK_WINDOW(window), WIDTH, HEIGHT);
    gtk_window_set_title(GTK_WINDOW(window), "RgbaShow");

	guchar rgbbuf[WIDTH *HEIGHT * 3];
	guchar *pos;
	pos = rgbbuf;
	for (int y = 0; y < HEIGHT; y++)
	{
    
		for (int x = 0; x < WIDTH; x++)
		{
    
			*pos++ = x<WIDTH/2?100:200;         /* Red. */
			*pos++ = y<HEIGHT/2?200:150;   		/* Green. */
			*pos++ = 207;         				/* Blue. */
		}
    }

	pixbuf = gdk_pixbuf_new_from_data(rgbbuf, GDK_COLORSPACE_RGB, FALSE, 8, WIDTH, HEIGHT, WIDTH*3, NULL, NULL);
	image = gtk_image_new_from_pixbuf(pixbuf);
	gtk_container_add(GTK_CONTAINER(window),image);
	gtk_widget_show_all(window);
    g_signal_connect(G_OBJECT(window),"destroy",G_CALLBACK(gtk_main_quit),NULL);
	gtk_main();
}

编译

g++ t.c `pkg-config --cflags --libs gtk+-2.0`

运行