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Routines |
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The handler of SetGraphicAttributes for a graphic that is flipped along the diagonal from top left to bottom right. This is the same as SetAttributes_RotatedLeft, except that the columns of the attributes are used from the left-hand side to the right-hand side.
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| SetAttributes_Transposed | 9DA0 | POP BC | Restore the attribute and graphic ID from the stack. | |
| 9DA1 | CALL GetGraphicAttributeDetails | Call GetGraphicAttributeDetails to get the details of the attributes. | ||
| 9DA4 | LD A,B | Fetch the width. | ||
| 9DA5 | EXX | Switch to the shadow registers. | ||
| 9DA6 | LD B,A | Keep the number of columns in B'. | ||
| 9DA7 | EXX | Switch back to the main registers. | ||
| SetAttributes_Transposed_Row | 9DA8 | PUSH BC | Stash the width and height on the stack. | |
| 9DA9 | PUSH DE | Stash the position in the attributes on the stack. | ||
| 9DAA | PUSH HL | Stash the attribute buffer address on the stack. | ||
| SetAttributes_Transposed_Cell | 9DAB | LD A,(DE) | Fetch the next attribute. | |
| 9DAC | AND A | Jump to SetAttributes_Transposed_Next if it is 00. | ||
| 9DAD | JR Z,SetAttributes_Transposed_Next | |||
| 9DAF | CP $FF | Jump to SetAttributes_Transposed_Write if it is not FF. | ||
| 9DB1 | JR NZ,SetAttributes_Transposed_Write | |||
| 9DB3 | LD A,($5E1A) | Fetch the room attribute from CurrentRoom_Attribute. | ||
| SetAttributes_Transposed_Write | 9DB6 | LD (HL),A | Write A to the attribute buffer. | |
| SetAttributes_Transposed_Next | 9DB7 | CALL AddWidthToAddress | Call AddWidthToAddress to move down to the next row of the attributes. | |
| 9DBA | INC L | Move HL on to the next cell. | ||
| 9DBB | DEC C | Decrease the height by one and loop back to SetAttributes_Transposed_Cell until all of the rows have been set. | ||
| 9DBC | JR NZ,SetAttributes_Transposed_Cell | |||
| 9DBE | POP HL | Restore the attribute buffer address from the stack. | ||
| 9DBF | LD BC,$0020 | BC=0020 (the size of a row of the attribute buffer). | ||
| 9DC2 | AND A | Move up a row. | ||
| 9DC3 | SBC HL,BC | |||
| 9DC5 | POP DE | Restore the position in the attributes from the stack. | ||
| 9DC6 | POP BC | Restore the width and height from the stack. | ||
| 9DC7 | INC DE | Move DE on to the next column. | ||
| 9DC8 | EXX | Switch to the shadow registers. | ||
| 9DC9 | DEC B | Decrease the number of columns by one. | ||
| 9DCA | EXX | Switch back to the main registers. | ||
| 9DCB | JR NZ,SetAttributes_Transposed_Row | Jump to SetAttributes_Transposed_Row until all of the columns are done. | ||
| 9DCD | RET | Return. | ||
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