Re: [Boost-users] [GIL] How can I copy a subimage_view to a view?

Subject: Re: [Boost-users] [GIL] How can I copy a subimage_view to a view?
From: blp330 (blp330_at_[hidden])
Date: 2009-04-26 13:42:17

Hi,

Thanks for your reply,

I initialize view member using io extension to read image file.
I try to create a local rgb8_image_t in crop method because I have another
method fill.

It look like this:

Image& Image::Fill(int x1, int y1, int x2, int y2, 
                   int r, int g, int b)
{
 boost::gil::rgb8_pixel_t pixel(r, g, b);
 
 boost::gil::fill_pixels(
  boost::gil::subimage_view(view, x1, y1, x2 - x1, y2 - y1), pixel);

 return *this;
}

But when I do this:

Image a("a.png");
Image b;

a.crop(100, 100, 50, 50, b);
a.fill(100, 100, 50, 50, 0xff, 0xff, 0xff);

I found that b will be also filled with white color.
So, I try to "copy" all pixels from a to b.

copy_pixels requires two view with the same dimension, but I can't change
dimension of a view directly, 
that is why I create a local rgb8_image_t to do that.

Now, I clarify my requirement. I need to do this:

Image a("a.png");
Image b;

a.crop(100, 100, 50, 50, b);
a.fill(100, 100, 50, 50, 0xff, 0xff, 0xff);

a and b are now with independent view. a.fill should not affect b. 

How can I do that? 

Thank you!
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