如何替换GDK_INCLUDE_INFERIORS？

发布于 2024-11-02 04:34:19 字数 645 浏览 2 评论 0原文

由于大多数 gdk_gc_* 方法在 GTK+ 3 中已被弃用，那么如何仅使用 Cairo 在子窗口上进行绘制呢？下面是我想要实现的一个简单示例：

GdkWindow *tl_window = parent_widget->window;
GdkGC *gc = gdk_gc_new(tl_window1->window);
gdk_gc_set_subwindow(gc, GDK_INCLUDE_INFERIORS);
gdk_gc_set_exposures(gc, FALSE);
do_my_painting(tl_window, gc);
gdk_gc_unref(gc);

http://developer.gnome.org/gdk/stable/gdk-Graphics-Contexts.html#gdk-gc-set-subwindow 表示 GDK_INCLUDE_INFERIORS 将用于来源。所以我认为诀窍是创建窗口的源，然后......那么......我被困住了。

原文

Since most of the gdk_gc_* methods are deprecated in GTK+ 3, how does one paint on sub-windows using Cairo only? Below is a simple example of what I would like to achieve:

GdkWindow *tl_window = parent_widget->window;
GdkGC *gc = gdk_gc_new(tl_window1->window);
gdk_gc_set_subwindow(gc, GDK_INCLUDE_INFERIORS);
gdk_gc_set_exposures(gc, FALSE);
do_my_painting(tl_window, gc);
gdk_gc_unref(gc);

http://developer.gnome.org/gdk/stable/gdk-Graphics-Contexts.html#gdk-gc-set-subwindow says GDK_INCLUDE_INFERIORS will be used on sources. So I assume the trick is to create a source of the window and then ... well then ... I'm stuck.

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辞别 2024-11-09 04:34:19

我自己找到了一个解决方案

GtkWidget *tl_window = gtk_widget_get_toplevel(widget);
cairo_t *cairo = gdk_cairo_create(gtk_widget_get_window(tl_window));
cairo_surface_t *source_surface = cairo_get_target(cairo);
cairo_t *cairo_new = cairo_create(source_surface);
cairo_set_source_surface(cairo, cairo_get_target(cairo_new), 0, 0);

do_my_painting(cairo_new);
cairo_paint(cairo);
cairo_destroy(cairo);

（我在这里错过了对 cairo_new 的破坏吗？）

我还找到了下一个链接（没有测试它）http://mail.gnome.org/archives/commits-list/2010-August/msg03385.html 他们似乎使用像素图而不是表面。

Found a solution myself

GtkWidget *tl_window = gtk_widget_get_toplevel(widget);
cairo_t *cairo = gdk_cairo_create(gtk_widget_get_window(tl_window));
cairo_surface_t *source_surface = cairo_get_target(cairo);
cairo_t *cairo_new = cairo_create(source_surface);
cairo_set_source_surface(cairo, cairo_get_target(cairo_new), 0, 0);

do_my_painting(cairo_new);
cairo_paint(cairo);
cairo_destroy(cairo);

(do I mis a destroy of cairo_new here ?)

I also found the next link (did not test it) http://mail.gnome.org/archives/commits-list/2010-August/msg03385.html where they seem to use a pixmap instead of a surface.

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