cairo 往图片上贴另一张图片用什么函数
用gdk的gdk_draw_bitbuf老提示
The gdk_draw_*_image require the drawable argument to have a specified colormap. All windows have a colormap,
however, pixmaps only have colormap by default if they were created with a non-NULL window argument. Otherwise
a colormap must be set on them with gdk_drawable_set_colormap
改用cairo ,不知道用什么函数……