PureBasic Forums - English

Posted: **Wed Aug 06, 2008 5:24 pm**

Neither Ward's WxCmmImageDecoder nor El_Choni's EC_ImagePluginOLE seem to be able to decode .GIF files under PB 4.20.
See: www.purebasic.fr/english/viewtopic.php?t=20618

EC_ImagePluginOLE used to be able to decode them under PB 3.90.

Does anyone know of a GIF decoder routine/source/librar/etc that will handle [non-animated] .GIFs correctly in the current version of Pure Basic?

Posted: **Wed Aug 06, 2008 6:15 pm**

Can always use gdi+ (windows XP, 2003 , Vista).

The following uses some of Netmaestro's code taken from http://www.purebasic.fr/english/viewtop ... lusstartup

Code: Select all

#GDIPLUS_OK = 0

;-Structures.
  Structure GdiplusStartupInput ;{
    GdiPlusVersion.l 
    *DebugEventCallback.DebugEventProc
    SuppressBackgroundThread.l 
    SuppressExternalCodecs.l 
  EndStructure


;-Imports.
  Import "gdiplus.lib"
    GdiplusStartup(token, *input.GdiplusStartupInput, output) 
    GdipCreateBitmapFromFile(filename.p-unicode, *bitmap)
    GdipGetImageWidth(*image, *width)
    GdipGetImageHeight(*image, *height)
    GdipCreateFromHDC(hdc.l, *graphics)
    GdipDrawImageRectI(*graphics, *image, x.l, y.l, width.l, height.l)
    GdipDeleteGraphics(*graphics)
    GdipDisposeImage(image)
    GdiplusShutdown(token)
  EndImport

;Returns zero if an error or the PB image#.
Procedure.l LoadGif(filename$)
  Protected result, width, height
  Protected input.GdiplusStartupInput, token, image, imageID, hdc, graphics
  ;First initialise gdi+.
    input\GdiPlusVersion = 1
    GdiplusStartup(@token, @input, #Null)
  ;Was the initialisation successful?
    If token
      If GdipCreateBitmapFromFile(filename$, @image) = #GDIPLUS_OK
        GdipGetImageWidth(image, @width) 
        GdipGetImageHeight(image, @height) 
        imageID = CreateImage(#PB_Any, Width, Height, 32) 
        If imageID
          hdc = StartDrawing(ImageOutput(imageID)) 
          If hdc
            GdipCreateFromHDC(hdc, @graphics) 
            If graphics
              GdipDrawImageRectI(graphics, image, 0, 0, width, height) 
              GdipDeleteGraphics(graphics)
              result = imageID      
            EndIf
            StopDrawing()  
          EndIf
        EndIf
        GdipDisposeImage(image)
      EndIf
      ;Tidy up.
        GdiplusShutdown(token)
    EndIf
  ProcedureReturn result
EndProcedure

;Test.

imageNum = LoadGif("test.gif")

Posted: **Wed Aug 06, 2008 6:26 pm**

An alternative would be the excellent FreeImage library.

Posted: **Thu Aug 07, 2008 12:02 am**

The code here is the best:

http://www.purebasic.fr/german/viewtopic.php?t=12155

It loads BMP, JPG, PNG and GIF files without using any third-party libraries
or PureBasic's in-built decoders. Saves on executable size immensely!

Posted: **Thu Aug 07, 2008 4:17 am**

Thank you for all the suggestions.

I am using Windows ME and this has led me to adopt PB's advice of using the routine[s] posted on the German Forum.

Incidently I notice some small errors in the routines CatchSpriteEx() and CatchImageEx() which are posted there:

Code: Select all

    dxsf\Release() 
  EndIf 
  Stream\Release() 
  EndIf 
  dxtf\Release() 
EndIf

should be:

Code: Select all

      Stream\Release()
    EndIf
    dxsf\Release()
  EndIf
  dxtf\Release()
EndIf

The statement order and indendation both need correcting.
(I have not posted this in the German forum.)

Posted: **Fri Aug 08, 2008 1:39 am**

here you go. 100% PB source for loading a GIF:

http://www.purebasic.fr/english/viewtop ... if+decoder

Posted: **Fri Aug 08, 2008 10:31 am**

@locomotion34
Thank you for the link. I have been reading the source code and it is very interesting and informative.

I have two books that contain detailed information on the GIF format (and other formats). Using them makes the PB code much easier to follow.

PureBasic Forums - English

Does Anyone have a GIF Decoder?

Does Anyone have a GIF Decoder?