Re: Pixbuff::get_pixels() image format.

[Alexander Gehlert <alexander gehlert raritan com>]

Evgeny Repekto wrote:

hi,

you need to create the pixbuf with the option has_alpha=false for 24bit rgb

static Glib::RefPtr<Pixbuf <cid:part1.04040903.00010201@raritan.com>> 
create <cid:part2.03050504.02000101@raritan.com> (Colorspace 
<cid:part3.01000902.08030200@raritan.com> colorspace, bool has_alpha, 
int bits_per_sample, int width, int height)

regards

Alex
> Hi,
>
> For more efficiency I wished to put raw image data to the Pixbuff directly.
> I have raw image data in this format:
>
> "RGBRGBRGB..." - stirng of unsigned char, the length of the string is
> (image height)x(image width)x3I guess it's famous type of image storing.
>
> I used memcpy function to put my image to the pixbuff. I got the pointer to
> the raw image data of Pixbuff by using get_pizels() method of Pixbuff.
> But after I have shown the Pixbuff I saw strange image. After some time
> of exploring, I got the idea, that I should put image this way
>
>     for (unsigned int i=0; i<mPicHeight; i++)
>         memcpy(mPixBuff->get_pixels()+i*mPicWidth*3+i*4*3,
> RawPic+i*mPicWidth*3, mPicWidth*3);
>
> What is this strange amount of information (i*4*3)? What for it?
>
> I tried to found the image format but I could not. As it said in the
> documentation
> for Gdk::PixBuff
>
> "guint8* Gdk::Pixbuf::get_pixels ()const
>  Queries a pointer to the pixel data of a pixbuf.
>
>  Returns:A pointer to the pixbuf's pixel data. Please see <xref
> linkend="image-data"/> for information about how the pixel data is
> stored in memory. "
>
> What this means <xref linkend="image-data"/>?
> Please, answer who knows, or has any ideas. I need to know the format for sure.
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>
>   


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Alexander Gehlert - Intern
reply to : alexander gehlert raritan com

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