ClearRect

Draws a solid white filled rectangle to the screen.

This call behaves the same as:

push hl
ld.sis hl, $FFFF
ld.sis (fillRectColor), hl
pop hl
call FillRect

• hl: Top-left X coordinate of the rectangle.
• de: Bottom-right X coordinate of the rectangle.
• b: Top-left Y coordinate of the rectangle.
• c: Bottom-right Y coordinate of the rectangle.

• Value at fillRectColor is loaded with $FFFF.
• Draws to screen.

• af