This code sample shows how to load an image file (BMP, GIF, JPEG, PNG, TIFF), scale it and save as .ICO file. It creates a simple icon file containing one 32x32 icon in 32 bit per pixel format and assigns the new icon to the Icon property.
The code instantiates objects defined in custom GDI+ class. Download the class module first and save it in gdiplus.prg file.
As I can find, VFP supports only 16x16 and 32x32 icons. Also note that CLEAR RESOURCES is required in case an icon file is overwritten with new content while linked to the Icon property of a form or of the main VFP screen.
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The bWidth and bHeight members of the ICONDIRENTRY structure occupy 1 byte each. This effectively restricts sizes of icons to 1..255 pixels range. While there are no other restrictions, common icon sizes include 16, 32, and 48 pixels square.
Use GDI+ library to load an image file. If needed, scale it to a common icon size or to any size within 255 pixels.
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