OS_SpriteOp 43 (changes)

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Programmer's OS Reference SWI Manuals Calls

» Part OS_SpriteOp 15 – SWI Calls

» OS_SpriteOp 43 – Read pixel maskOS

OS_SpriteOp 43 – Read pixel mask

(SWI &2E)

Use

This call allows the value of a sprite mask pixel to be read.

Notes

Coordinates are specified in pixels, with (0,0) being the bottom-left corner of the sprite.

For sprites with the wide mask flag set in the Sprite Mode Word, the returned value is an alpha value between 0 and 255, with 255 representing a fully opaque pixel and 0 representing a fully transparent pixel.

For other sprites, the returned value is either 0 or 1, representing transparent and opaque respectively.

If the sprite lacks a mask, the value returned is the appropriate value for if the pixel was opaque (i.e. 255 or 1).

See also

• Format Of Sprite
• Format Of Sprite Area
• Sprite Mode Word
• OS_SpriteOp
• OS_SpriteOp 44 - Write pixel mask