Mercurial > public > hwos_code
view src/aa_wordprocessor.asm @ 588:bf0c76e9b01b
Sync safety stop countdown output
author | heinrichsweikamp |
---|---|
date | Sat, 10 Mar 2018 15:39:33 +0100 (2018-03-10) |
parents | b455b31ce022 |
children | ca4556fb60b9 |
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;============================================================================= ; ; File aa_wordprocessor.asm ## V2.97 ; ; Anti-aliased word processor ; ; Copyright (c) 2011, JD Gascuel, HeinrichsWeikamp, all right reserved. ;============================================================================= ; HISTORY ; 2010-11-22 : [jDG] Creation. ; 2010-12-01 : [jDG] Adding 3bits anti-aliased fonts. ; 2010-12-30 : [jDG] Revised to put temp into ACCESSRAM0 ; 2012-08-12 : [mH] Moved font28 into bootloader section 0x1C000 ; ; BUGS : ; * If the three fonts are not in the same half of the PROM memory, TBLPTRU ; will be badly set, and font48 or font90 will display gibberish... ;============================================================================= ; ; MEMORY FOOTPRINT: ;------------------ ; ; wp_wordprocessor : 8 KB, including fonts ; aa_wordprocessor : 0.5 KB code ; + 3.5 KB aa_font28 (reduced to 99 chars) ; + 1.6 KB aa_font48 ; + 2.2 KB aa_font90 ; = 7.9 KB including fonts ; ; Input registers: ; buffer:26 String to print ; win_font Font size (0=tiny, 1=small, 2=medium, 3=large) ; win_color1:2 16bits unpacked color ; win_top, win_leftx2 Position on screen ; win_inverse Inverse video mode ; ; Available general purpose registers: ; PRODH, PRODL needed for array indexing) ; FSRx 12bits. Useful as RAM pointers. ;============================================================================= #include "hwos.inc" #include "tft.inc" extern aa_font16_block extern aa_font28_block extern aa_font36_block extern aa_font48_block extern aa_font90_block ;------------------------------------------------------------------------------ ; Setup pointers for a char: ; Inputs WREG = char to draw, win_font ; Output aa_start, aa_end, win_height, aa_flags ; Trashed PRODH, PRODL, TBLPTR, TABLAT ; basic CODE aa_char_setup: movwf PRODL ; save char into PROD for now movf win_font,W,BANKED ; Get font number (updates Z flag) bnz aa_char_1 ; TINY font --------------------------------------------------------- ; Font TINY character folding... aa_char_0: movlw LOW aa_font16_block movwf TBLPTRL movlw HIGH aa_font16_block movwf TBLPTRH movlw UPPER aa_font16_block movwf TBLPTRU bra aa_char_99 ; SMALL font --------------------------------------------------------- ; Font SMALL character folding... aa_char_1: decfsz WREG ; This is small font ??? bra aa_char_2 movlw LOW aa_font28_block movwf TBLPTRL movlw HIGH aa_font28_block movwf TBLPTRH movlw UPPER aa_font28_block movwf TBLPTRU bra aa_char_99 ; STD font ----------------------------------------------------------- ; Font SMALL character folding... aa_char_2: decfsz WREG ; This is small font ??? bra aa_char_3 movlw LOW aa_font36_block movwf TBLPTRL movlw HIGH aa_font36_block movwf TBLPTRH movlw UPPER aa_font36_block movwf TBLPTRU bra aa_char_99 ; MEDIUM font -------------------------------------------------------- aa_char_3: decfsz WREG ; This is medium font ??? bra aa_char_4 ; Font MEDIUM block: movlw LOW aa_font48_block movwf TBLPTRL movlw HIGH aa_font48_block movwf TBLPTRH movlw UPPER aa_font48_block movwf TBLPTRU bra aa_char_99 ; LARGE font --------------------------------------------------------- aa_char_4: ; Font LARGE block: movlw LOW aa_font90_block movwf TBLPTRL movlw HIGH aa_font90_block movwf TBLPTRH movlw UPPER aa_font90_block movwf TBLPTRU ; Execute font block ------------------------------------------------- aa_char_99: ; This is safe if the three fonts are in the same code segment ; (and that segment do not span the 64K edge...) movlw UPPER aa_font16_block movwf TBLPTRU ; Proceed to character substitutions aa_char_30: tblrd*+ ; Read FROM char movf TABLAT,W ; Get it, and set Z,N bz aa_char_32 ; Break at end of translations tblrd*+ ; Read TO char cpfseq PRODL ; FROM == current char ? bra aa_char_30 ; Different: loop movff TABLAT, PRODL ; make substitution bra aa_char_30 ; Loop ; Make sure char is in the available range aa_char_32: tblrd*+ ; Read first char movf TABLAT,W ; get it subwf PRODL,F ; (char - first) --> PRODL tblrd*+ ; Read nb chars movf TABLAT,W ; nbchars --> WREG tblrd*+ ; Read default char cpfslt PRODL ; if char > WREG ? movff TABLAT,PRODL ; replace PRODL ; Decode font height and anti-aliasing mode clrf aa_flags ; Default to no AA tblrd*+ ; Read font height + AA flag movf TABLAT,W ; into WREG bnn aa_char_34 ; High bit set ? bsf aa_antialias ; YES : then the font is AA aa_char_34: andlw 0x7F ; Keep just font height, movwf win_height,BANKED ; then save it (its a register) ; Set PROM pointer to the char index movf PRODL,W ; Read back char mullw 2 ; PROD = 2*(char - base), TBLPTR=idx movf PRODL,W addwf TBLPTRL,F ; Add into TBLPTR (low byte) movf PRODH,W addwfc TBLPTRH,F ; and high byte ; Read start and stop pointers tblrd*+ ; aa_start = PROM16(*tblptr++) movff TABLAT,aa_start+0 ; Read low byte tblrd*+ movff TABLAT,aa_start+1 ; and high byte tblrd*+ ; aa_end = PROM16(*tblptr++) movff TABLAT,aa_end+0 ; Read low byte tblrd*+ movff TABLAT,aa_end+1 ; and high byte return ;------------------------------------------------------------------------------ ; Character width ; Inputs aa_start, aa_end, win_width, win_height, aa_flags ; Output width added to win_width ; Trashed aa_bitlen, TBLPTR, TABLAT ; aa_char_width: movff aa_start+0, TBLPTRL ; TBLPTR = aa_start movff aa_start+1, TBLPTRH clrf aa_bitlen ; clear reminders... ; Read bitmap byte, and decode length: aa_char_width_1: ifdef AA_BYTE_SWAP btg TBLPTRL,0 ; Toggle low ptr bit tblrd* movf TABLAT,W ; Store to WREG btg TBLPTRL,0 ; Get is back tblrd*+ ; then increment (but trash TABLAT) movwf TABLAT ; Then restore copy to TABLAT else tblrd*+ ; Normal read... movf TABLAT,W ; Store copy to WREG endif btfss aa_antialias ; Anti-aliased font ? bra aa_char_width_10 ; No: always 7 bits count bn aa_char_width_10 ; Non-white pixels ? andlw 0x1F ; Yes : 5 bits count aa_char_width_10: andlw 0x7F ; No: 7 bit count incf WREG ; WREG = repetition count addwf aa_bitlen,F ; Add remaining pixels from last code movf win_height,W,BANKED ; WREG = - height negf WREG ; This is a hand-made division by successive subtraction of height aa_char_width_2: addwf aa_bitlen,F ; Try to subtract win_height bn aa_char_width_3 ; If neg it was a bad idea... infsnz win_width+0,F ; Succeeded: do a 16bit increment incf win_width+1,F ; on the win_width counter bra aa_char_width_2 ; and loop aa_char_width_3: negf WREG ; WREG = +height addwf aa_bitlen,F ; Restore true reminder ; Are we done ? movf TBLPTRL,W ; Compare TBLPTR to aa_end cpfseq aa_end+0 bra aa_char_width_1 ; Loop if LOW is different movf TBLPTRH,W cpfseq aa_end+1 ; Loop to if HIGH is different bra aa_char_width_1 return ;------------------------------------------------------------------------------ ; String width ; Inputs buffer (SHOULD BE NULL TERMINATED) ; Output win_width, win_height ; Trashed PROD, TBLPTR, FSR2, aa_bitlen, aa_start, aa_end, aa_flags ; aa_string_width: lfsr FSR2, buffer ; FSR2 pointer to start of string clrf win_width+0 ; Clear width sum clrf win_width+1 ; (16 bit counter) aa_string_width_1: movf POSTINC2,W ; WREG = *FSR2++ bz aa_string_width99 ; Exit if null byte encountered rcall aa_char_setup ; setup aa_start / aa_end rcall aa_char_width ; sum-up width into win_width bra aa_string_width_1 ; and loop aa_string_width99: return ;------------------------------------------------------------------------------ ; Decode a compressed char. ; Inputs aa_start, aa_end, win_height, win_invert, win_color1, win_color2 ; Output none ; Trashed TBLPTR, TABLAT, PROD, aa_bitlen, aa_flags, aa_colorDir:2 ; aa_decode_char: movff aa_start+0, TBLPTRL ; TBLPTR = aa_start movff aa_start+1, TBLPTRH ; Read bitmap byte, and decode color & length aa_decode_1: ifdef AA_BYTE_SWAP btg TBLPTRL,0 ; Toggle low ptr bit tblrd* movf TABLAT,W ; Store to WREG btg TBLPTRL,0 ; Get is back tblrd*+ ; then increment (but trash TABLAT) movwf TABLAT ; Then restore copy to TABLAT else tblrd*+ ; Normal read... movf TABLAT,W ; Store copy to WREG endif btfss aa_antialias ; Anti-aliased font ? bra aa_decode_10 ; No: always 7 bits count bn aa_decode_10 ; Non-white pixels ? andlw 0x1F ; Yes : 5 bits count aa_decode_10: andlw 0x7F ; No: 7 bit count incf WREG movwf aa_bitlen ; repetition count --> aa_bitlen ;---- COLOR DECODING ------------------------------------------------- ; ; Code Normal Inverse ; 1xx 0% 100% : Managed by aa_decode_13 ; 011 25% 75% ; 010 50% 50% ; 001 75% 25% ; 000 100% 0% : Managed by aa_decode_13 too ; movf TABLAT,W ; Get back code btfss aa_antialias ; Anti-aliased font ? bra aa_decode_13 ; NO: 1bit case ; Asymmetry test: 1xx code is another case for 1bit color. ; This have to be done before inverse video, because ; of the asymmetric processing ! bn aa_decode_13 ; decode as not-aa ; Manage 000 special case too: andlw 0xE0 ; Select color bits bz aa_decode_13 ; That's a 000 ! ; Apply reverse video, in a reversed way btfss win_invert ; Inverse video mode ? sublw 0x80 ; Move the two bits to aa_color_half and aa_color_quarter: swapf WREG ; --> 0000.0LL0 byte iorlw b'001' ; We are in AA mode, don't forget it ! movwf aa_flags ; save that to aa_color_(half/quad)/AA flags ;---- 2 bit x RGB(16bits) computation -------------------------------- clrf PRODL ; We will accumulate result here... clrf PRODH ; Take color div 2 into aa_temp. Max red = 15/31 rrcf win_color1,W,BANKED ; xRRRRxGG andlw b'01111011' ; 0RRRR0GG (don't change C) movwf aa_temp+0 rrcf win_color2,W,BANKED ; GGGxBBBB andlw b'11101111' ; GGG0BBBB movwf aa_temp+1 btfss aa_color_half bra aa_decode_12 movff aa_temp+0,PRODH ; Add color/2 if bit set movff aa_temp+1,PRODL ; TFT is big endian, so swap here aa_decode_12: btfss aa_color_quart bra aa_decode_3 ; Divide it once again by 2. Max red = 7/31. rrcf aa_temp+0,W ; xxRRRxxG andlw b'00111001' ; 00RRR00G (don't change C) movwf aa_temp+0 rrcf aa_temp+1,W ; GGGxxBBB andlw b'11100111' ; GGG00BBB movwf aa_temp+1 movf aa_temp+1,W ; Add color/4 addwf PRODL,F ; NOTE: 7/31+15/31=22/31, movf aa_temp+0,W ; hence components won't overlap addwfc PRODH,F ; In right order, to propagate carry bra aa_decode_3 ; Done ; ---- Simple BLACK and WHITE cases ------------------------------ aa_decode_13: ; Got a 1xx or a 000 code... btfsc win_invert ; Inverse video mode ? xorlw 0x80 ; YES: invert levels bn aa_decode_2 ; Then test high bit ; WHITE pixel (i.e. full color) bsf tft_rs,0 ; RS_H Data movff win_color1,PORTA ; current draw color movff win_color2,PORTH ; (rem: TFT is big endian) bra aa_decode_4 aa_decode_2: bsf tft_rs,0 ; RS_H Data clrf PORTA ; BLACK pixel clrf PORTH bra aa_decode_4 aa_decode_3: bsf tft_rs,0 ; RS_H Data movff PRODH,PORTA ; Move high byte to PORTA movff PRODL,PORTH ; Move low byte to PORTH aa_decode_4: bcf INTCON,GIE aa_decode_4a: ;---- PIXEL WRITE LOOP ----------------------------------------------- bcf tft_nwr,0 ; WR_L bsf tft_nwr,0 ; WR_H Tick decf aa_bitlen,F bnz aa_decode_4a bsf INTCON,GIE ;---- BYTE-CODE LOOP ------------------------------------------------- ; Are we done ? movf TBLPTRL,W ; Compare TBLPTR to aa_end cpfseq aa_end+0 bra aa_decode_1 ; Loop if LOW is different movf TBLPTRH,W cpfseq aa_end+1 ; Loop too if HIGH is different bra aa_decode_1 return ;------------------------------------------------------------------------------ ; Setup pointers for a char: ; Inputs : buffer : string to print (SHOULD BE NULL TERMINATED) ; Output : TFT commands on port D + clocks. ; global aa_wordprocessor ; Callable from C-code aa_wordprocessor: banksel win_font ; Bank1, just to be sure rcall aa_string_width ; Set win_height, compute win_width:2 call TFT_box_write ; Use that for the box ; Restart the loop for each char to print lfsr FSR2, buffer ; FSR2 pointer to start of string ; DATA block command Index_out 0x22 ; Index_out is a macro defined in tft.inc aa_wordprocessor_1: movf POSTINC2,W ; WREG = *FSR2++ bz aa_wordprocessor_99 ; Exit if null byte encountered rcall aa_char_setup ; setup aa_start / aa_end rcall aa_decode_char ; write pixels to screen bra aa_wordprocessor_1 ; and loop aa_wordprocessor_99: ; END of bloc command Index_out 0x00 return END