mirror of
https://github.com/QB64Official/qb64.git
synced 2024-09-28 11:17:47 +00:00
48 lines
1.7 KiB
Markdown
48 lines
1.7 KiB
Markdown
|
The [_PIXELSIZE](_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.
|
||
|
|
||
|
## Syntax
|
||
|
|
||
|
> pixelSize% = [_PIXELSIZE](_PIXELSIZE)[(imageHandle&)]
|
||
|
|
||
|
## Description
|
||
|
|
||
|
* If imageHandle& is omitted, it is assumed to be the current write page.
|
||
|
* Returns:
|
||
|
* 0 if the image or screen page specified by imageHandle& is in text mode.
|
||
|
* 1 if the image specified by imageHandle& is in 1 (B & W), 4 (16 colors) or 8 (256 colors) BPP mode.
|
||
|
* 4 if the image specified is a 24/32-bit compatible mode. Pixels use three bytes, one per red, green and blue color intensity.
|
||
|
* The [SCREEN](SCREEN) or [_NEWIMAGE](_NEWIMAGE) or [_LOADIMAGE](_LOADIMAGE) color mode (256 or 32) can influence the pixel sizes that can be returned.
|
||
|
* If imageHandle& is an invalid handle, then an [ERROR Codes](ERROR-Codes) error occurs.
|
||
|
|
||
|
## Example(s)
|
||
|
|
||
|
*Snippet:* Saving Images for later program use. Handle values could be saved to an array.
|
||
|
|
||
|
```text
|
||
|
|
||
|
handle1& = _Getimage(sx1, sy1, sx2, sy2, sourcehandle&) ' function call
|
||
|
|
||
|
FUNCTION GetImage& (sx1, sy1, sx2, sy2, sourcehandle&)
|
||
|
bytespp = _PIXELSIZE(sourcehandle&)
|
||
|
IF bytespp = 4 THEN Pal = 32 ELSE IF bytespp = 1 THEN Pal = 256 ELSE EXIT FUNCTION
|
||
|
h& = _NEWIMAGE(ABS(sx2 - sx1) + 1, ABS(sy2 - sy1) + 1, Pal)
|
||
|
_PUTIMAGE (0, 0), sourcehandle&, h&, (sx1, sy1)-(sx2, sy2) 'image is not displayed
|
||
|
GetImage& = h&
|
||
|
END FUNCTION
|
||
|
|
||
|
```
|
||
|
|
||
|
### More examples
|
||
|
|
||
|
* [SAVEIMAGE](SAVEIMAGE) (SUB to convert image to bitmap)
|
||
|
* [SaveIcon32](SaveIcon32) (convert any image to icon)
|
||
|
* [ThirtyTwoBit SUB](ThirtyTwoBit-SUB) (convert partial image to bitmap)
|
||
|
* [Bitmaps](Bitmaps)
|
||
|
|
||
|
## See Also
|
||
|
|
||
|
* [_LOADIMAGE](_LOADIMAGE)
|
||
|
* [_NEWIMAGE](_NEWIMAGE)
|
||
|
* [_PUTIMAGE](_PUTIMAGE)
|
||
|
* [_COPYPALETTE](_COPYPALETTE)
|