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LoadImage displaying jpg bug blitz3d blitzplus

Archives Forums/Blitz3D Bug Reports/LoadImage displaying jpg bug blitz3d blitzplus

Dan(Posted 2015) [#1]
Hello, looks like blitzBasic (3d and +) have a bug in displaying some of jpeg images.

Here is the code to show it.



Graphics 640,480,32,2
SetBuffer BackBuffer()
             ;Here you can see the bug, the image is not correctly displayed 
             ;the bug is seen after applying the filter
             ;Comment the next 4 lines and uncomment the other ones to see the difference   
             Image = LoadImage ("ctrl-a--i102533-notworkincorrectly.jpg")
			 IX=ImageWidth(Image)
   			 IY=ImageHeight(Image)
             DrawBlock image,0,0
             
             ;Uncomment following 4 lines (this one displays the correct picture)
             ;Image = OpenMovie ("ctrl-a--i102533-notworkincorrectly.jpg")
			 ;IX=MovieWidth(Image)
   			 ;IY=MovieHeight(Image)
             ;DrawMovie image,0,0,IX,IY 
	xa=-1
    LockBuffer
	For y=-1 To IY
    	For x=-1 To IX
        	Xa=Xa+1:If xa=2 Then xa=0 
	       WritePixel x+xa,y+ya, rgb
    	Next
	Next
	UnlockBuffer
Flip
WaitKey()


(im using the latest versions of b3d and b+ at the time of writing)
Tested on Win8.1 and WinXP(under vmware)

Converting the JPG to BMP displays the image correctly.


Liimbix(Posted 2015) [#2]
That's strange, because I'm using Blitz3D, making a voxel engine, and for each block, you have to use jpg textures, and they work fine. PNG don't work though


Dan(Posted 2015) [#3]
not every jpg image shows this bug, but this one does.

It is one of the images, which show a hidden image when ctrl a is pressed
in older versions of Internet explorer.