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首先在窗口中添加一个drawingarea，并使“GDK_EXPOSURE_MASK”触发有效。
首加载图片到一个PIXBUF中，可以在程序初始做这件事。本例在窗口的“show”回调函数里做这事，代码如下：- pixbuf_src = gdk_pixbuf_new_from_file ("gtk-logo-rgb.gif", NULL); //将图片加载到pixbuf_src中
- //下面两句是获取图片的宽和高。
- original_width = gdk_pixbuf_get_width(pixbuf_src);
- original_height = gdk_pixbuf_get_height(pixbuf_src);
第一种方法，用PIXBUF的缩放功能：- pixbuf_src = gdk_pixbuf_scale_simple (pixbuf_src,
- (widget->allocation.width),
- (widget->allocation.height),
- GDK_INTERP_BILINEAR);
- gdk_pixbuf_render_to_drawable (pixbuf_src,
- widget->window,
- widget->style->fg_gc[GTK_WIDGET_STATE (widget)],
- 0, 0,//src
- 0, 0,//dest
- (widget->allocation.width),
- (widget->allocation.height),
- GDK_RGB_DITHER_NORMAL,
- 0, 0);
- gdouble scale_x, scale_y;
- cairo_t *cr;
- scale_x = (widget->allocation.width) / (original_width*1.0);
- scale_y = (widget->allocation.height) / (original_height*1.0);
- cr = gdk_cairo_create (widget->window);
- cairo_scale (cr, scale_x, scale_y);
- gdk_cairo_set_source_pixbuf (cr, pixbuf_src, 0, 0);
- cairo_paint (cr);
- cairo_destroy (cr);
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发表于 2011-5-8 17:31:57
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