|
Routines |
| Prev: C77D | Up: Map | Next: C7CF |
|
Used by the routines at CheckScoreAwardLife and RenderHUD.
Refreshes the on-screen life icons. Runs 07 passes of Erase_Life_Icon_Cells (masked clear) with glyph code 1B vertical seed *Wave and step *Lives_Display_Vertical_Step. If *Lives is zero, returns; else D is the lives count capped at 07 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.
|
||||
| DrawLivesDisplay | C794 | LD D,$07 | D=07 (fixed passes for the clear / background phase). | |
| C796 | LD A,($C416) | E=*Wave (initial vertical parameter for the first phase). | ||
| C799 | LD E,A | |||
|
Seven stacked clears using Erase_Life_Icon_Cells (CPL and AND into the display file).
|
||||
| DrawLivesDisplay_ClearLoop | C79A | PUSH DE | Stash DE on the stack. | |
| C79B | LD A,$1B | A=1B (life-icon character / glyph selector). | ||
| C79D | LD B,E | B=E (vertical argument for the blit helper). | ||
| C79E | LD C,$00 | C=00. | ||
| C7A0 | CALL Erase_Life_Icon_Cells | Call Erase_Life_Icon_Cells (masked clear at this cell). | ||
| C7A3 | POP DE | Restore DE from the stack. | ||
| C7A4 | LD A,($C417) | A=*Lives_Display_Vertical_Step (vertical spacing between stacked slots). | ||
| C7A7 | ADD A,E | Add E to A. | ||
| C7A8 | LD E,A | E=A (advance the vertical parameter). | ||
| C7A9 | DEC D | Decrement D. | ||
| C7AA | JP NZ,DrawLivesDisplay_ClearLoop | Loop back to DrawLivesDisplay_ClearLoop until all 07 clear passes finish. | ||
| C7AD | LD HL,$C415 | HL=Lives (lives counter). | ||
| C7B0 | LD A,(HL) | A=*HL. | ||
| C7B1 | AND A | Return if there are no lives to draw. | ||
| C7B2 | RET Z | |||
| C7B3 | CP $08 | Compare with 08. | ||
| C7B5 | JR C,DrawLivesDisplay_CountReady | Jump to DrawLivesDisplay_CountReady if the count is below 08 (use it as-is). | ||
| C7B7 | LD A,$07 | A=07 (cap at seven visible life icons). | ||
| DrawLivesDisplay_CountReady | C7B9 | LD D,A | D=A (number of OR-blits to perform). | |
| C7BA | INC HL | Advance HL to Wave (vertical seed for the draw phase). | ||
| C7BB | LD E,(HL) | E=*HL. | ||
|
Each iteration OR-merges a life glyph via Draw_Life_Icon_Cells (see Draw_Life_Icon_Cells).
|
||||
| DrawLivesDisplay_DrawLoop | C7BC | PUSH DE | Stash DE on the stack. | |
| C7BD | LD A,$1B | A=1B. | ||
| C7BF | LD B,E | B=E. | ||
| C7C0 | LD C,$00 | C=00. | ||
| C7C2 | CALL Draw_Life_Icon_Cells | Call Draw_Life_Icon_Cells (OR-blit at this cell). | ||
| C7C5 | POP DE | Restore DE from the stack. | ||
| C7C6 | LD A,($C417) | A=*Lives_Display_Vertical_Step. | ||
| C7C9 | ADD A,E | Add E to A. | ||
| C7CA | LD E,A | E=A (advance the vertical parameter). | ||
| C7CB | DEC D | Decrement D. | ||
| C7CC | JR NZ,DrawLivesDisplay_DrawLoop | Loop back to DrawLivesDisplay_DrawLoop while more icons remain. | ||
| C7CE | RET | Return. | ||
| Prev: C77D | Up: Map | Next: C7CF |