Routines
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B52E: Print Double Height Text
Used by the routines at RechargeBattery, DisplayMenu and DrawGameScreen.
Prints a string of text that is two characters tall. The string starts with an attribute byte, and its last character has bit 7 set.
Before After
print-double-height-before print-double-height-after
Input
HL Position (H is y, L is x, in pixels)
DE Address of the string
PrintDoubleHeightText B52E PUSH HL Save the position.
B52F CALL AttributeAddress Find the address of the attributes at that position using AttributeAddress.
B532 LD A,(DE) Fetch the attribute from the start of the string.
B533 INC DE Move on to the first character.
B534 LD C,A Keep the attribute.
B535 LD B,$02 The text is two characters tall.
PrintDoubleHeightText_Attributes B537 PUSH DE Save the pointer to the text.
B538 PUSH HL Save the attribute address.
PrintDoubleHeightText_Attribute B539 LD (HL),C Colour the current cell.
B53A LD A,(DE) Fetch the next character code.
B53B INC DE Move on.
B53C INC L Move on to the next column.
B53D BIT 7,A Test whether it was the last character of the text.
B53F JR Z,PrintDoubleHeightText_Attribute Loop back until the whole row has been coloured.
B541 POP HL Restore the attribute address.
B542 LD DE,$0020 Move down to the next row.
B545 ADD HL,DE
B546 POP DE Restore the pointer to the text.
B547 DJNZ PrintDoubleHeightText_Attributes Loop back to colour the second row.
B549 POP HL Restore the position.
B54A CALL ScreenAddress Find the screen address using ScreenAddress.
PrintDoubleHeightText_Character B54D LD A,(DE) Fetch the next character code.
B54E BIT 7,A Jump to PrintDoubleHeightCharacter to print the last character.
B550 JP NZ,PrintDoubleHeightCharacter
B553 CALL PrintDoubleHeightCharacter Print the character using PrintDoubleHeightCharacter.
B556 JR PrintDoubleHeightText_Character Jump back to print the next character.
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