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Routines |
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Used by the routines at CheckScoreAwardLife and RenderHUD.
Refreshes the on-screen life icons. Runs 7 passes of Erase_Life_Icon_Cells (masked clear) with glyph code 27 vertical seed *Wave and step *Lives_Display_Vertical_Step. If *Lives is zero, returns; else D is the lives count capped at 7 the vertical seed is reloaded from *Wave, and that many OR-blits run via Draw_Life_Icon_Cells with the same glyph and stride. Called from RenderHUD and CheckScoreAwardLife.
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| DrawLivesDisplay | 51092 | LD D,7 | D=7 (fixed passes for the clear / background phase). | |
| 51094 | LD A,(50198) | E=*Wave (initial vertical parameter for the first phase). | ||
| 51097 | LD E,A | |||
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Seven stacked clears using Erase_Life_Icon_Cells (CPL and AND into the display file).
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| DrawLivesDisplay_ClearLoop | 51098 | PUSH DE | Stash DE on the stack. | |
| 51099 | LD A,27 | A=27 (life-icon character / glyph selector). | ||
| 51101 | LD B,E | B=E (vertical argument for the blit helper). | ||
| 51102 | LD C,0 | C=0. | ||
| 51104 | CALL Erase_Life_Icon_Cells | Call Erase_Life_Icon_Cells (masked clear at this cell). | ||
| 51107 | POP DE | Restore DE from the stack. | ||
| 51108 | LD A,(50199) | A=*Lives_Display_Vertical_Step (vertical spacing between stacked slots). | ||
| 51111 | ADD A,E | Add E to A. | ||
| 51112 | LD E,A | E=A (advance the vertical parameter). | ||
| 51113 | DEC D | Decrement D. | ||
| 51114 | JP NZ,DrawLivesDisplay_ClearLoop | Loop back to DrawLivesDisplay_ClearLoop until all 7 clear passes finish. | ||
| 51117 | LD HL,50197 | HL=Lives (lives counter). | ||
| 51120 | LD A,(HL) | A=*HL. | ||
| 51121 | AND A | Return if there are no lives to draw. | ||
| 51122 | RET Z | |||
| 51123 | CP 8 | Compare with 8. | ||
| 51125 | JR C,DrawLivesDisplay_CountReady | Jump to DrawLivesDisplay_CountReady if the count is below 8 (use it as-is). | ||
| 51127 | LD A,7 | A=7 (cap at seven visible life icons). | ||
| DrawLivesDisplay_CountReady | 51129 | LD D,A | D=A (number of OR-blits to perform). | |
| 51130 | INC HL | Advance HL to Wave (vertical seed for the draw phase). | ||
| 51131 | LD E,(HL) | E=*HL. | ||
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Each iteration OR-merges a life glyph via Draw_Life_Icon_Cells (see Draw_Life_Icon_Cells).
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| DrawLivesDisplay_DrawLoop | 51132 | PUSH DE | Stash DE on the stack. | |
| 51133 | LD A,27 | A=27. | ||
| 51135 | LD B,E | B=E. | ||
| 51136 | LD C,0 | C=0. | ||
| 51138 | CALL Draw_Life_Icon_Cells | Call Draw_Life_Icon_Cells (OR-blit at this cell). | ||
| 51141 | POP DE | Restore DE from the stack. | ||
| 51142 | LD A,(50199) | A=*Lives_Display_Vertical_Step. | ||
| 51145 | ADD A,E | Add E to A. | ||
| 51146 | LD E,A | E=A (advance the vertical parameter). | ||
| 51147 | DEC D | Decrement D. | ||
| 51148 | JR NZ,DrawLivesDisplay_DrawLoop | Loop back to DrawLivesDisplay_DrawLoop while more icons remain. | ||
| 51150 | RET | Return. | ||
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