LOADIMAGE

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Revision as of 08:39, 7 February 2011 by imported>Clippy
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The _LOADIMAGE function loads an image into memory and returns an image handle for a graphic file image.


Syntax

handle& = _LOADIMAGE& (filename$[, mode&])


Description

  • File types supported: BMP, JPG, PNG, GIF, PNM, XPM, XCF, PCX, TIF, LBM, and TGA. A path can also be given.
  • The Mode& can designate 256(8 bit) or 32 bit color. Omit to use the current screen settings.
  • Some images may not load when a mode value is designated. Try loading it without a mode designation.
  • Images can be made into a program SCREEN or page adopting the size and palette settings or placed using _PUTIMAGE.
  • When you are in SCREEN 0 a mode& must be designated. When loading an _ICON use 32 for the mode.
  • Returns -1 as an invalid handle if it could not load the image. Valid LONG handle returns are less than -1.
  • Valid images only need to be loaded ONCE! The handle can be used repeatedly until freed.
  • It is IMPORTANT to free unused or discarded images with _FREEIMAGE to prevent CPU memory overflow errors!


Examples

Example 1: Already in SCREEN 13 and want computer to match the 32-bit jpg/etc. colors to the current palette:

SCREEN 13 i& = _LOADIMAGE("mypic.jpg") _PUTIMAGE, i&


Example 2: Already in SCREEN 13 but want to load an 8-bit image and adopt its palette as the current palette:

SCREEN 13 i& = _LOADIMAGE("mypic256col.bmp", 256) _COPYPALETTE i&, 0 _PUTIMAGE, i&


Example 3: Want to display an image in 32-bit color using its resolution as a program screen:

i& = _LOADIMAGE("mypic.jpg", 32) SCREEN i&


See Examples:

  • SAVEIMAGE (QB64 Image to Bitmap SUB by Galleon)


See also



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