如何在DrawingArea上用cairo画bmp图

chenzhixin

因为我的DRAWINGAREA要放置视频，所以在上面放入图片比较麻烦，我想用cairo来做，可我的图像是BMP的，而cairo_image_surface_create_from_png用的是PNG的，我不知道该怎么弄了？有什么什么方法可以取得BMP中的RGB数据？

chenzhixin

GtkWidget *image;
        GdkPixbuf *pixbuf;
        char *data;
        int width,height,stride,bpp;

        cairo_t *cr;
        cairo_surface_t *surface;

        image = gtk_image_new_from_file("f11.bmp");
        pixbuf = gtk_image_get_pixbuf(image);
        data = gdk_pixbuf_get_pixels(pixbuf);
        width = gdk_pixbuf_get_width(pixbuf);
        height = gdk_pixbuf_get_height(pixbuf);
        stride = gdk_pixbuf_get_rowstride(pixbuf);
        bpp = gdk_pixbuf_get_bits_per_sample(pixbuf);

        dprintk("width=%d,height=%d,stride=%d,bpp=%d\n",width,height,stride,bpp);

        cr = gdk_cairo_create(wbus->drawingarea->window);
        surface = cairo_image_surface_create_for_data(data,CAIRO_FORMAT_A8,width,height,stride);

        cairo_set_source_surface (cr, surface, 100, 300);
        cairo_paint_with_alpha(cr,1);       
        //cairo_paint(cr);

        cairo_destroy(cr);
        cairo_surface_destroy(surface);
        gtk_widget_destroy(image);