Re: printing images

[Jean Bréfort <jean brefort free fr>]

Le mer 03/11/2004 à 20:16, Robert Roebling a écrit :
>   Hello,
> 
> I'm currently writing the GNOME print backend
> for the printing system of wxWidgets and all
> goes well, except for that my little knowledge
> of the PostScript language doesn't suffice to
> understand what is wrong about my printing code
> for images. I'm just trying to print RGB right
> now. I use
> 
> gnome_print_moveto( gpc, x,y );
> gnome_print_rgbimage( gpc, (chunk of RGB data), 32, 32, 32*3 );

AFAIK, you need to call gnome_print_scale:
gnome_print_scale (gpc, 32, 32);

So your code should be:
gnome_print_gsave (gpc);
gnome_print_moveto( gpc, x,y );
gnome_print_scale (gpc, 32, 32);
gnome_print_rgbimage( gpc, (chunk of RGB data), 32, 32, 32*3 );
gnome_print_grestore (gpc);

> but nothing shows up in the printout. It is
> there in the file, but something is wrong.
> I've included the PS output for a simple test
> file (8Kb is hopefully OK). It shows a few lines
> and on page 1 one large rectangle and a small one.
> The image should be where the small rectangle is,
> but it is not. 
> I'm aware that this might be an obvious error,
> but I don't see it. Maybe the positioning is
> outside the visible bounds or the image in
> shrunk to zero?
> 
> Thanks for any info,
> 
>   Robert
> 
> %!PS-Adobe-3.0
> %%Creator: Gnome Print Version 2.8.0
> %%CreationDate: D:20041103195809
> %%LanguageLevel: 2
> %%DocumentMedia: Regular 595 841 0 () ()
> %%Orientation: Portrait
> %%BoundingBox: 0 0 596 842
> %%Pages: 2
> %%PageOrder: Ascend
> %%Title: 
> %%DocumentSuppliedResources: procset pnome-print-procs-2.8.0
> %%Requirements: numcopies(1) duplex
> %%EndComments
> %%BeginDefaults
> %%PageMedia: Regular
> %%EndDefaults
> %%BeginProlog
> %%BeginResource: procset gnome-print-procs-2.8.0
> /B {load def} bind def
> /n /newpath B /m /moveto B /l /lineto B /c /curveto B /h /closepath B
> /q /gsave B /Q /grestore B
> /J /setlinecap B /j /setlinejoin B /w /setlinewidth B /M /setmiterlimit
> B
> /d /setdash B
> /rg /setrgbcolor B
> /W /clip B /W* /eoclip B
> /f /fill B /f* /eofill B
> /S /stroke B
> /cm /concat B
> /SP /showpage B
> /FF /findfont B /F {scalefont setfont} bind def
> %%EndResource
> %%EndProlog
> %%BeginSetup
> <<
> /PageSize [595 841]
> /ImagingBBox null
> /Duplex true
> /Tumble false
> /NumCopies 1
> /Policies <<
> /PolicyNotFound 1
> /PageSize 3
> >>
> >> setpagedevice
> %%EndSetup
> %%Page: 1 1
> %%PageResources: (atend)
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> [32 0 0 -32 0 32]
> { currentfile buf readhexstring pop }
> false 3 colorimage
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> Q
> Q
> SP
> %%PageTrailer
> %%PageResources: procset gnome-print-procs-2.8.0
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> %%PageTrailer
> %%PageResources: procset gnome-print-procs-2.8.0
> %%Trailer
> %%EOF
>  
> 
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