Routines
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51378: Fill Attribute Rectangle
Used by the routine at UpdateLogoPiece.
Sets a rectangle of attributes in the attribute buffer.
Input
A Attribute
B Width
C Height
HL Address in the attribute buffer
Work out the distance from one row to the next.
FillAttributeRectangle 51378 LD E,A Add the flash colour used in the last frame (PreviousFlashColour) to the attribute, and keep it.
51379 LD A,(48124)
51382 OR E
51383 EX AF,AF'
51384 LD A,24 Work out how far to move on from the end of one row of the rectangle to the start of the next.
51386 SUB B
51387 LD E,A
51388 LD D,0
51390 EX AF,AF'
Fill each row of the rectangle.
FillAttributeRectangle_Row 51391 PUSH BC Keep the width and the height.
FillAttributeRectangle_Loop 51392 LD (HL),A Set the attributes of one row of the rectangle.
51393 INC HL
51394 DJNZ FillAttributeRectangle_Loop
51396 ADD HL,DE Move on to the start of the next row, and loop back until all of the rows have been set.
51397 POP BC
51398 DEC C
51399 JR NZ,FillAttributeRectangle_Row
51401 RET Return.
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