gd library - help

DNAarray · Post by **DNAarray** » Jun 06, 2006 2:02

In the examples, there is an example to use the gd library "gd_test.bas". It creates a file called test.gif. This library is pretty awesome and I would like to use it as a basis for many programs like picture viewer and to convert my, sf.phpcad.net, to a much better desktop application. probably textcad. In the example there is this line.

declare function saveImgToGIF( byval img as gdImagePtr, filename as string ) as integer

Is there anyway to display this image on a freebasic screen?

Thanks, Bill

cha0s · Post by **cha0s** » Jun 06, 2006 2:34

hey, I never used this lib before, and i don't have the lib (can't find -lgd on compile), but I made some guesses as to how the lib handles things internally. Maybe this works, but if not then sorry. It's only a guess.

Code: Select all

#Include "gd\gd.bi"
#Include "crt.bi"

Dim As gdImagePtr myGIF
Dim As FILE Ptr GIF_File


Sub GIF_Blit( giffy As gdImagePtr, x As Integer, y As Integer )
  
  Dim As Integer calc
  
  calc = giffy->sy * giffy->sx
  calc += 4
  
  Dim As uByte img( calc - 1 )
  
  Cast( uShort Ptr, Varptr( img( 0 ) ) )[0] = giffy->sx Shl 3
  Cast( uShort Ptr, Varptr( img( 0 ) ) )[1] = giffy->sy
  
  For calc = 0 To giffy->sy - 1
  
    MemSet( Varptr( Cast( uShort Ptr, Varptr( img( 0 ) ) )[2] ) + ( calc * giffy->sx ), giffy->pixels[calc], giffy->sx )
    
  Next
  
  Put( x, y ), img


End Sub


screen 13

GIF_File = fopen( "anemone.gif", "r" )

myGIF = gdImageCreateFromGif( GIF_File )

GIF_Blit( myGIF )

Sleep


gdImageDestroy( myGIF )

DNAarray · Post by **DNAarray** » Jun 06, 2006 4:00

libgd2-xpm-dev - GD Graphics Library version 2 (development version)

You should try a debian based system. I use hard disk install of kanotix and love it.

apt-get install libgd2-xpm-dev and you are done.

I will give your idea a go.

cha0s · Post by **cha0s** » Jun 06, 2006 4:28

Actually I'm on windows XD.

I love coding blindly and seeing if it works. It's really fun.

DNAarray · Post by **DNAarray** » Jun 06, 2006 7:10

I could not get it to work, kept getting segmentation fault. But, did get a verticle line of dots one time

cha0s · Post by **cha0s** » Jun 06, 2006 18:36

You would be better off using another lib than gd. gd is a lib for opening, manipulating and saving images, not displaying them. I have heard people talk about FreeImage

D.J.Peters · Post by **D.J.Peters** » Jun 06, 2006 20:59

I'm so blind or is bpp are missing?
Cast( uShort Ptr, Varptr( img( 0 ) ) )[0] = (giffy->sx Shl 3) or BPP
BPP=1 or 2 or 4

Joshy

cha0s · Post by **cha0s** » Jun 06, 2006 22:40

Honestly, it was a quick hack.

I don't have the library to run the code, GIF->sx, GIF->sy might not even contain the image dimensions... Just a lame guess. ;)

DNAarray · Post by **DNAarray** » Jun 07, 2006 1:49

I think you could get it to work if you had a library for it. The png works, but somehow the WBMP does not make a correct header fro a bmp file. Thus, I tryed to use pload, but could not get that to work.

declare function gdImageCreateTrueColor alias "gdImageCreateTrueColor" (byval sx as integer, byval sy as integer) as gdImagePtr

that is in Frebasic/inc/gd.bi

Maybe, the you dont need to compile and can use the one from php for windows.

How to Obtain the php_gd2.dll

The GD dll's are provided in the latest download packages of the PHP installation for windows.

Download the zip package for Windows from the following page:-

http://www.php.net/downloads.php

Unzip the package and copy the php_gd2.dll from the ./ext/ dir to the /ext/ dir of your installation.

( In some cases it is also necessary to place a copy of all the DLL's in the ./ext/ dir in the ./system32 dir. )

If you download the Windows binaries from php . net the gd . dll is included with it . http : / / www . php . net / do_download . php ? download_file = php ...

DNAarray · Post by **DNAarray** » Jun 08, 2006 2:20

http://www.boutell.com/gd/

This is the site of the library. Although freeimage, imagemagick are good, i think this one might be the best.

markem · Post by **markem** » May 16, 2023 23:38

I realize this is AGES old, but the answer to the question about if you can display a GD image - it answer is - Yes. You can do it.

Really simply, GD has a way to get the width and height of an image (imageX and imageY I think).

So you get the width and height and then clear your Freebasic buffer and then just do a FOR statement. Using GD, you just get the pixel at the X,Y location and then put it into your FreeBasic buffer. That will transfer the image to FreeBasic.

You might want to look at FLTK also. I think FLTK means Fast, Light, Tool Kit. FLTK will read graphics and do a lot of other things.

So there you have it - two answers in one post and my head hasn't exploded yet.

gd library - help

gd library - help

thanks

didn't work

I think you can could get it to work

Found dll

Re: gd library - help