Re: [GD-DEVEL] get data from gdImagePtr

--20cf302075924df1d704b6301c18
Content-Type: text/plain; charset=ISO-8859-1

Karl Lehenbauer
Thanks. will look into it and then reply back

On Tue, Jan 10, 2012 at 11:12 PM, Karl Lehenbauer
<[email protected]>wrote:

> There is a call in the GD library called getImageGetPixel that takes a
> gdImagePtr and x and y pixel coordinates and returns the color table index
> or an encoded RGB color if it's a truecolor image.  You can obtain the
> individual colors using gdImageRed, gdImageBlue and gdImageGreen with the
> image pointer and returned color as arguments.
>
> You can get the image height and width using gdIMageSY and geImageSX with
> the image pointer as an argument.
>
> You'll need to make calls to allocate your Qpixmap of the right size and
> then iterate through all the pixels of the GD image, pulling the colors of
> each pixel in turn and using whatever calls your Qt library uses to write
> the colors into the Qpixmap.
>
> Hope that helps!
>
>
> On 1/10/12 8:18 AM, "Mohammed Rashad" <[email protected]> wrote:
>
> >this may seems offtopic for php developers but not for gd-devs
> >I am doing some vector rendering using libgd. I filled the gdImagePtr with
> >drawpoint/drawline/drawpolygon functions. now if I save the gdImagePtr to
> >some file i will get png/jpeg image.
> >
> >upto here its fine
> >
> >
> >now comes the real problem......
> >
> >I am using Qt as a front end for displaying image from gd. currently it
> >works like this gdImagePtr --> pngfile --> QPixmap --> Qt
> >
> >I dont want to create a png file everytime the gdImagePtr is update (each
> >zoom/pan will update gdImagePtr)
> >
> >so converting to file and reading again is a overhead in my case
> >I want to show gdImagePtr on QPixmap with all conversion process running
> >on
> >memory.
> >
> >Is that possible in gd?
> >
> >
> >How to pull chunk of data from gdImagePtr?
> >
> >Any will be much appreciated...
> >
> >Thanks in Advance
> >
> >--
> >Regards,
> >   Rashad
>
>
>


-- 
Regards,
   Mohammed Rashad K.M
   MS (by Research) student
   International Institute of Information Technology, Hyderabad
   500032

--20cf302075924df1d704b6301c18--