gtkmm绘制单个像素
#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;
}
但他们说“gdk_draw_rgb_image
已弃用,不应在新编写的代码中使用。”
我想要一个像素数组中的图像,我可以在其中直接操作像素。
基本上,我只是想“绘制”我之前想要修改的像素数组。 Cairo 是一个不错的工具,但不适合我的目的。因此,矩形不是一个选项。
这已经不可能了吗?
好吧,我之前提到的示例是有效的,但我不喜欢在新代码中使用已弃用的库。
那么我还能如何绘制像素呢? 这是一个 gtk 示例。我们正在使用 GtkMM,我想知道是否有与之等效的东西。
非常感谢和最诚挚的问候
Refering to the example on the Documentation for 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;
}
But they say that "gdk_draw_rgb_image
is deprecated and should not be used in newly-written code."
I would like to have an image in an array of pixels, where I can directly manipulate the pixels.
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.
Isn't this possible anymore?
Well, the example I mentioned before works, but I prefer not to use deprecated libraries for new code.
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.
Many Thanks and best regards
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您必须使用开罗。
所有 GDK 绘图函数在 GDK 3 中均已弃用并删除。
您可以使用
GdkPixbuf
http://developer.gnome.org/gdk-pixbuf/unstable//gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf 与 Cairo 交互函数gdk_cairo_set_source_pixbuf 和 <代码>gdk_cairo_rectangle http://developer.gnome.org/gdk3/stable/gdk3-Cairo-Interaction .html。
You have to use cairo.
All GDK drawing functions are deprecated and removed in GDK 3.
You can use a
GdkPixbuf
http://developer.gnome.org/gdk-pixbuf/unstable//gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf with Cairo interaction functionsgdk_cairo_set_source_pixbuf
andgdk_cairo_rectangle
http://developer.gnome.org/gdk3/stable/gdk3-Cairo-Interaction.html.您可以构建自己的“put_pixels(.. .)" 功能类似于 此处。
您将需要对像素缓冲区进行操作。
我也用过这个方法。
You can build your own "put_pixels(...)" function like discribed here.
You will need to operate on the pixel-buffer.
I also used this approach.