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Drawing with 32 bit color?

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Carl Gundel-2

Drawing with 32 bit color?

When I specify a CgRGBColor with red, green and blue values the colors seem to distill down to a 16-color palette. For example the following creates a pixmap and then fills it with a color and then copies it to the clipboard. The color is a dark red, but it should look more like purple.

| window pixmap result |
window := CgWindow default.
pixmap := CgPixmap screen: window screen.
result :=
  pixmap
   compatibleWith: window
   width: 320
   height: 240
   depth: window depth.
pixmap fill: (CgRGBColor red: 16r9000 green: 16r0000 blue: 16r4000).
pixmap copyToClipboard

By the way, what's the easiest way to view a pixmap in VAST without copying it to the clipboard and opening a paint program?

Thanks,

-Carl

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Carl Gundel-2

Re: Drawing with 32 bit color?

Any takers on this? It seems funny to me that in CgPixmap>>compatibleWith:width:height:depth: there is palette related code being invoked in this mechanism when my PC is running 32-bit color.

CommonGraphics imageSupportLoaded
ifTrue: [self privateSetDefaultPalette]

And this code does set a palette with a size of 16. Is this where the problem lays? Why should it work this way when a depth of 32 is specified?

Thanks,

-Carl

On Monday, March 3, 2014 2:45:58 PM UTC-5, Carl Gundel wrote:

When I specify a CgRGBColor with red, green and blue values the colors seem to distill down to a 16-color palette. For example the following creates a pixmap and then fills it with a color and then copies it to the clipboard. The color is a dark red, but it should look more like purple.

| window pixmap result |
window := CgWindow default.
pixmap := CgPixmap screen: window screen.
result :=
  pixmap
   compatibleWith: window
   width: 320
   height: 240
   depth: window depth.
pixmap fill: (CgRGBColor red: 16r9000 green: 16r0000 blue: 16r4000).
pixmap copyToClipboard

By the way, what's the easiest way to view a pixmap in VAST without copying it to the clipboard and opening a paint program?

Thanks,

-Carl

Wayne Johnston

Re: Drawing with 32 bit color?

Not really related, but this reminded me...

If you try to load a 32-bit color BMP file, you get a walkback. See how CgWinBMPFileFormat>>loadInfoHeader: and how it handles up to 24-bit.