GtkStatusIcon绘图问题

发布于 2024-12-06 22:41:11 字数 1443 浏览 1 评论 0原文

我在 C 中使用 gtk+-2.0，并且我必须在托盘图标上写一个数字。我这样做是这样的：

 static GdkPixbuf * transform_pixbuf(GdkPixbuf *pixbuf) {
    cairo_t *cr;

    int width = gdk_pixbuf_get_width(pixbuf);
    int height = gdk_pixbuf_get_height(pixbuf);

    GdkPixmap *pixmap = gdk_pixmap_new(NULL, width, height, 24);
    cr = gdk_cairo_create(pixmap);
    gdk_cairo_set_source_pixbuf(cr, pixbuf, 0, 0);
    cairo_paint(cr);  

    cairo_select_font_face (cr, "serif", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD);
    cairo_set_font_size (cr, 15.0);
    cairo_set_source_rgb (cr, 1.0, 0, 0); 
    cairo_move_to (cr, 10, 20);
    cairo_show_text (cr, "8");

    cairo_destroy(cr);

    GdkPixbuf *pixbuf_new = gdk_pixbuf_get_from_drawable(NULL, pixmap, NULL,
        0, 0, 0, 0, width, height);

    return pixbuf_new;
  }

其中 GdkPixbuf *pixbuf 是我想在托盘中设置的 GdkPixbuf。我可以画一个数字，但图标的背景变成了“跳舞” - 在此处输入图像描述。

我猜问题出在 gdk_pixmap_new 的 深度 参数中，因为图标具有 32 位格式，但 32 不是该函数的有效参数。在这种情况下，我有以下警告并且托盘中没有图标：

Gdk-警告 **：使用 Cairo 渲染需要使用可绘制参数有指定的颜色图。所有窗口都有一个颜色图，然而，像素图默认只有颜色图，如果它们使用非 NULL 窗口参数创建。否则必须使用 gdk_drawable_set_colormap 在它们上设置颜色图
Gdk-警告 **：/build/buildd/gtk+2.0-2.24.4/gdk/gdkpixbuf-drawable.c:1249：源可绘制对象没有颜色图；要么传入颜色图，要么使用 gdk_drawable_set_colormap() 在可绘制对象上设置颜色图

，请建议我...

原文

i'm using gtk+-2.0 in C. and i have to write a digit upon my tray icon. i do it such way:

 static GdkPixbuf * transform_pixbuf(GdkPixbuf *pixbuf) {
    cairo_t *cr;

    int width = gdk_pixbuf_get_width(pixbuf);
    int height = gdk_pixbuf_get_height(pixbuf);

    GdkPixmap *pixmap = gdk_pixmap_new(NULL, width, height, 24);
    cr = gdk_cairo_create(pixmap);
    gdk_cairo_set_source_pixbuf(cr, pixbuf, 0, 0);
    cairo_paint(cr);  

    cairo_select_font_face (cr, "serif", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD);
    cairo_set_font_size (cr, 15.0);
    cairo_set_source_rgb (cr, 1.0, 0, 0); 
    cairo_move_to (cr, 10, 20);
    cairo_show_text (cr, "8");

    cairo_destroy(cr);

    GdkPixbuf *pixbuf_new = gdk_pixbuf_get_from_drawable(NULL, pixmap, NULL,
        0, 0, 0, 0, width, height);

    return pixbuf_new;
  }

where GdkPixbuf *pixbuf is GdkPixbuf i want to set in tray. i can draw a digit, but the icon's background became "dancing" - enter image description here .

i guess the problem is in gdk_pixmap_new's depth argument, because the icon has 32bit format, but 32 isn't valid argument for this function. in such case i have followin warning and no icon in the tray:

Gdk-WARNING **: Using Cairo rendering requires 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
Gdk-WARNING **: /build/buildd/gtk+2.0-2.24.4/gdk/gdkpixbuf-drawable.c:1249: Source drawable has no colormap; either pass in a colormap, or set the colormap on the drawable with gdk_drawable_set_colormap()

Suggest me, please...

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