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47 lines
1.9 KiB
Plaintext
47 lines
1.9 KiB
Plaintext
The {{KW|_PIXELSIZE}} function returns the color depth (Bits Per Pixel) of an image.
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{{PageSyntax}}
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:''return&'' = {{KW|_PIXELSIZE}}([{{Parameter|imageHandle&}}])
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{{PageDescription}}
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* If {{Parameter|imageHandle&}} is omitted, it is assumed to be a handle to the current write page.
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* Returns:
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:: 0 if the image or screen page specified by {{Parameter|imageHandle&}} is in text mode.
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:: 1 If the image specified by {{Parameter|imageHandle&}} is in 1(B & W), 4(16 color) or 8(256 color) BPP mode.
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:: 4 Image specified is a 24/32-bit compatible mode. Pixels use three bytes, one per Red, Green and Blue color intensity.
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* The [[SCREEN]] or [[_NEWIMAGE]] or [[_LOADIMAGE]] color(256 or 32) mode can influence the pixel sizes that can be returned.
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* If {{Parameter|imageHandle&}} is an invalid handle, then an [[ERROR Codes|invalid handle]] error is returned.
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''Example:'' Saving Images for later program use. Handle values could be saved to an array.
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{{CodeStart}} '' ''
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handle1& = _Getimage(sx1, sy1, sx2, sy2, sourcehandle&) ' function call
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{{Cl|FUNCTION}} GetImage& (sx1, sy1, sx2, sy2, sourcehandle&)
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bytespp = {{Cl|_PIXELSIZE}}(sourcehandle&)
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{{Cl|IF}} bytespp = 4 {{Cl|THEN}} Pal = 32 {{Cl|ELSE}} {{Cl|IF}} bytespp = 1 {{Cl|THEN}} Pal = 256 {{Cl|ELSE}} {{Cl|EXIT FUNCTION}}
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h& = {{Cl|_NEWIMAGE}}({{Cl|ABS}}(sx2 - sx1) + 1, {{Cl|ABS}}(sy2 - sy1) + 1, Pal)
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{{Cl|_PUTIMAGE}} (0, 0), sourcehandle&, h&, (sx1, sy1)-(sx2, sy2) 'image is not displayed
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GetImage& = h&
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{{Cl|END FUNCTION}} '' ''
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{{CodeEnd}}
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{{small|Adapted from code by Galleon}}
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''See examples:''
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* [[SAVEIMAGE]] {{text|(SUB to convert image to bitmap)}}
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* [[SaveIcon32]] {{text|(convert any image to icon)}}
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* [[ThirtyTwoBit SUB]] {{text|(convert partial image to bitmap)}}
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* [[Bitmaps]]
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{{PageSeeAlso}}
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* [[_LOADIMAGE]]
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* [[_NEWIMAGE]]
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* [[_PUTIMAGE]]
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* [[_COPYPALETTE]]
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{{PageNavigation}} |