Microsoft KB Archive/120396

= PRB: Image Functions Fail with Image Outside of Viewport =

PSS ID Number: 120396

Article Last Modified on 8/30/2001

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The information in this article applies to:


 * Microsoft FORTRAN PowerStation for MS-DOS 1.0a

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This article was previously published under Q120396



SYMPTOMS
The image functions SAVEIMAGE, SAVEIMAGE_W, LOADIMAGE, and LOADIMAGE_W fail when the specified image falls outside the current viewport. After SAVEIMAGE fails, calling GRSTATUS will return: $GRIMAGEREADERROR.



CAUSE
Though not documented, this behavior is by design. The functions listed above will fail when you attempt to place even part of an image outside the viewport. Images are never clipped to the viewport.



RESOLUTION
Do not attempt to place images outside of the current viewport. Either make the viewport larger or work with partial (smaller) images.



STATUS
This behavior does occur with FORTRAN PowerStation 32.



MORE INFORMATION
To demonstrate the problem, compile and run the sample program. The only bitmap file saved will be TEST.BMP, and the output will be:   Saving full viewport returns:           0 Saving outside viewport returns:        -1 Saving outside viewport GRSTATUS: $GRIMAGEREADERROR

Sample Code
C Compile options needed: none

include 'fgraph.fi' include 'fgraph.fd'

integer*2 i, ret(3)

i = setvideomode($VRES16COLOR) call setviewport(10,10,20,20) ret(1) = saveimage("test.bmp",0,0,10,10) ret(2) = saveimage("test2.bmp",0,0,10,11) ret(3) = GRSTATUS

i = setvideomode($DEFAULTMODE)

print *, "Saving full viewport returns:", ret(1) print *, "Saving outside viewport returns:", ret(2) if (ret(3) .eq. $GRIMAGEREADERROR) +   print *, "Saving outside viewport GRSTATUS: $GRIMAGEREADERROR"

end

Additional query words: 1.00 1.00a

Keywords: KB120396

Technology: kbAudDeveloper kbFORTRANPower100aDOS kbFortranSearch kbZNotKeyword3

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