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shave some byte
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4am
parent
32eaba3605
commit
af5dbe8db1
@ -7,7 +7,7 @@
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;
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; LC RAM BANK 1
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; D000..E789 - persistent data structures (gGlobalPrefsStore, gGamesListStore)
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; E973..FFF1 - main program code
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; E97B..FFF1 - main program code
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; FFF2..FFF9 - API functions and global constants available for main program
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; code, prelaunchers, transition effects, &c.
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; (Wait/UnwaitForVBL, MockingboardStuff, MachineStatus)
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@ -17,7 +17,7 @@
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; D000..D3FF - ProRWTS data
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; D400..D66F - ProRWTS code
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; D670..DB91 - HGR font code & ProRWTS glue code
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; DB60..DB6F - backup of stack (during gameplay and self-running demos)
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; DB5C..DB6B - backup of stack (during gameplay and self-running demos)
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; ...unused...
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; DBB4..DBFF - (de)acceleration function
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; DC00..DFFF - HGR font data
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@ -1,4 +1,4 @@
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;license:MIT
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:MIT
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;(c) 2018-2021 by 4am & qkumba
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;
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; Double hi-res slideshows
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@ -295,7 +295,7 @@ DrawGameTitleInActionSlideshow
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; to display properly on the DHGR screen.
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;
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; /!\ must be called immediately after calling one of the font drawing routines
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; (Draw40Chars, DrawCenteredString, DrawString, DrawBuffer)
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; (Draw40Chars, DrawCenteredString, DrawString)
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;
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; in: gPathname contains number of bytes to transform
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; DBIRow0/LC2 contains address of first byte of first row to transform
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@ -11,7 +11,6 @@
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; - Draw40Chars
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; - DrawCenteredString
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; - DrawString
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; - DrawBuffer
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;
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DrawString
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@ -35,8 +34,3 @@ DrawCenteredString
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jsr SwitchToBank2
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jsr DrawCenteredStringInternal
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bmi JmpSwitch ; always
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DrawBuffer
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jsr SwitchToBank2
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jsr DrawBufferInternal
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bmi JmpSwitch ; always
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@ -17,32 +17,29 @@ DrawPageInternal
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; drawing starts at VTAB 0
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; each line starts at column X which was passed in (0-indexed)
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; clobbers PTR
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; clobbers $FF
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; clobbers $FE/$FF
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; clobbers A/X/Y
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; preserves C, other flags clobbered
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stx $FF
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ldx #0
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stx VTAB
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+ST16 PTR
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php ; save C, but Z=1 because of ldx #0
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@drawLine
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lda $FF
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sta HTAB
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ldy #0
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lda (PTR), y ; A = length of line, or #$FF
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bmi drawLineDone ; if #$FF then we're done
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php ; C = whatever was passed in
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pha ; save length
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jsr DrawStringSuperInternal
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pla ; A = length of line
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clc ; advance PTR to start of next line
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jsr DrawStringInternal_PTR_is_already_set
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bmi @donePage
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clc
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adc PTR
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sta PTR
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bcc +
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inc PTR+1
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+ plp
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inc VTAB ; this will print 255 lines if you give
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bne @drawLine ; it 255 lines, because this is assembly
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drawLineDone
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+ plp ; restore C to whatever it was on entry
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php
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beq @drawLine ; always branches
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@donePage
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plp
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rts
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Draw40CharsInternal
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@ -51,13 +48,12 @@ Draw40CharsInternal
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;v carry bit set -> draw on page 2
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; $25 contains textpage line (0..23) (this is the standard VTAB address)
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; drawing starts at HTAB 0
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; increments VTAB
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; increments VTAB on exit
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; sets HTAB to 0 on exit
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; clobbers A/X/Y
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jsr +
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ldx #40
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jsr DrawBufferInternal
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inc VTAB
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+ ldx #0
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stx HTAB
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rts
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@ -78,10 +74,11 @@ DrawCenteredStringInternal
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lsr
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sta HTAB
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plp
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beq +
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beq DrawStringInternal_PTR_and_Y_are_already_set
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DrawStringInternal
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; A/Y contains address of length-prefixed string
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; length can be 0
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; carry bit clear -> draw on page 1
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; carry bit set -> draw on page 2
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; $24 contains starting column (0..39) (this is the standard HTAB address)
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@ -89,13 +86,16 @@ DrawStringInternal
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; clobbers A/X/Y
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; clobbers PTR/PTR+1
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+ST16 PTR
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DrawStringInternal_PTR_is_already_set
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ldy #0
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+ lda (PTR),y
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DrawStringSuperInternal
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tax
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DrawStringInternal_PTR_and_Y_are_already_set
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lda (PTR),y
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inc PTR
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bne +
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inc PTR+1
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+ tax
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bpl +
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rts
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+
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+LD16 PTR
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; /!\ execution falls through here to DrawBufferInternal
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@ -111,11 +111,11 @@ DrawBufferInternal
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; $25 contains textpage line (0..23) (this is the standard VTAB address)
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; all characters are drawn on the same line
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; HTAB is incremented for each character
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; VTAB is NOT incremented
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; clobbers A/X/Y
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; clobbers X,Y
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; increments VTAB on exit
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; A=buffer length on exit
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; N=0 on exit
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+ST16 DBISrc+1
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dex
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bmi drawLineDone ; empty string
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php
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lda VTAB
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asl
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@ -169,6 +169,9 @@ DrawBufferInternal
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sta DBIRow5+1
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sta DBIRow6+1
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sta DBIRow7+1
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txa
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pha
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bpl + ; always branches because X is 0..40
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DBILoop
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DBISrc ldy $FDFD,x
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lda FontDataRow0,y
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@ -188,6 +191,8 @@ DBIRow6 sta $FDFD,x
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lda FontDataRow7,y
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DBIRow7 sta $FDFD,x
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inc HTAB
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dex
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+ dex
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bpl DBILoop
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pla ; A = buffer length (passed in in X)
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inc VTAB
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rts
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