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52 lines
2 KiB
Plaintext
52 lines
2 KiB
Plaintext
{{DISPLAYTITLE:_PIXELSIZE}}
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The [[_PIXELSIZE]] function returns the color depth (Bits Per Pixel) of an image as 0 for text, 1 for 1 to 8 BPP or 4 for 32 bit.
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{{PageSyntax}}
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: {{Parameter|pixelSize%}} = [[_PIXELSIZE]][({{Parameter|imageHandle&}})]
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{{PageDescription}}
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* If {{Parameter|imageHandle&}} is omitted, it is assumed to be 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 colors) or 8 (256 colors) BPP mode.
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** 4 if the 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 mode (256 or 32) 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 occurs.
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{{PageExamples}}
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''Snippet:'' Saving Images for later program use. Handle values could be saved to an array.
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{{TextStart}} '' ''
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handle1& = _Getimage(sx1, sy1, sx2, sy2, sourcehandle&) ' function call
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{{Cb|FUNCTION}} GetImage& (sx1, sy1, sx2, sy2, sourcehandle&)
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bytespp = {{Cb|_PIXELSIZE}}(sourcehandle&)
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{{Cb|IF...THEN|IF}} bytespp = 4 {{Cb|THEN}} Pal = 32 {{Cb|ELSE}} {{Cb|IF...THEN|IF}} bytespp = 1 {{Cb|THEN}} Pal = 256 {{Cb|ELSE}} {{Cb|EXIT FUNCTION}}
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h& = {{Cb|_NEWIMAGE}}({{Cb|ABS}}(sx2 - sx1) + 1, {{Cb|ABS}}(sy2 - sy1) + 1, Pal)
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{{Cb|_PUTIMAGE}} (0, 0), sourcehandle&, h&, (sx1, sy1)-(sx2, sy2) 'image is not displayed
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GetImage& = h&
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{{Cb|END FUNCTION}} '' ''
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{{TextEnd}}
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{{small|Adapted from code by Galleon}}
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===More 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}}
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