gtkmm绘制单个像素 [英] gtkmm drawing single pixels

问题描述

请参考文档中的示例Gtkmms GdkRGB :

#include <gtk/gtk.h>
#define IMAGE_WIDTH 256
#define IMAGE_HEIGHT    256
guchar rgbbuf[IMAGE_WIDTH * IMAGE_HEIGHT * 3];
gboolean on_darea_expose (GtkWidget *widget,
          GdkEventExpose *event,
          gpointer user_data);
int
main (int argc, char *argv[])
{
  GtkWidget *window, *darea;
  gint x, y;
  guchar *pos;
  gtk_init (&argc, &argv);
  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  darea = gtk_drawing_area_new ();
  gtk_widget_set_size_request (darea, IMAGE_WIDTH, IMAGE_HEIGHT);
  gtk_container_add (GTK_CONTAINER (window), darea);
  gtk_signal_connect (GTK_OBJECT (darea), "expose-event",
                  GTK_SIGNAL_FUNC (on_darea_expose), NULL);
  gtk_widget_show_all (window);
  /* Set up the RGB buffer. */
  pos = rgbbuf;
  for (y = 0; y < IMAGE_HEIGHT; y++)
    {
      for (x = 0; x < IMAGE_WIDTH; x++)
    {
      *pos++ = x - x % 32;          /* Red. */
      *pos++ = (x / 32) * 4 + y - y % 32;   /* Green. */
      *pos++ = y - y % 32;          /* Blue. */
    }
    }
  gtk_main ();
  return 0;
}
gboolean
on_darea_expose (GtkWidget *widget,
     GdkEventExpose *event,
     gpointer user_data)
{
  gdk_draw_rgb_image (widget->window, widget->style->fg_gc[GTK_STATE_NORMAL],
          0, 0, IMAGE_WIDTH, IMAGE_HEIGHT,
          GDK_RGB_DITHER_MAX, rgbbuf, IMAGE_WIDTH * 3);
  return TRUE;
}

但是他们说" gdk_draw_rgb_image 已过时，不应在新编写的代码中使用."

But they say that "gdk_draw_rgb_image is deprecated and should not be used in newly-written code."

我想在一个像素阵列中有一个图像，我可以在其中直接操纵像素.

I would like to have an image in an array of pixels, where I can directly manipulate the pixels.

基本上，我只是想绘制"我想修改的像素阵列.开罗是一个很好的工具，但不适合我的目的.因此， rectangle 不是一个选择.

Basically, I just would like to "draw" an array of pixels I would like to modify before. Cairo is a nice tool, but not suitable for my purpose. Therefore, rectangle is not an option.

这不可能了吗?

好吧，我之前提到的示例是可行的，但是我不希望对新代码使用不赞成使用的库.

Well, the example I mentioned before works, but I prefer not to use deprecated libraries for new code.

那我还能怎么画像素?这是一个gtk示例.我们正在使用GtkMM，我想知道是否与此等效.

How else can I draw my pixels then? And this is a gtk example. We're using GtkMM and I would like to know whether there's an equivalent to this.

非常感谢和问候

推荐答案

您必须使用开罗.

在GDK 3中已弃用并删除了所有GDK绘图功能.

All GDK drawing functions are deprecated and removed in GDK 3.

您可以使用 GdkPixbuf http://developer.gnome.org/gdk3/stable/gdk3-Cairo-Interaction.html .

You can use a GdkPixbuf http://developer.gnome.org/gdk-pixbuf/unstable//gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf with Cairo interaction functions gdk_cairo_set_source_pixbuf and gdk_cairo_rectangle http://developer.gnome.org/gdk3/stable/gdk3-Cairo-Interaction.html.

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