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annotate code_part1/OSTC_code_asm_part1/printf.asm @ 96:25433449bcb5

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adding anti-aliased fonts!
author heinrichsweikamp
date Sat, 11 Dec 2010 19:13:26 +0100
parents 3e351e25f5d1
children
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1 ;=============================================================================
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2 ;
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3 ; file printf.asm
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4 ; brief Implementation code for the PRINTF macros.
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5 ; author JD Gascuel.
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6 ;
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7 ; copyright (c) 2010, JD Gascuel. All rights reserved.
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8 ; $Id: printf.asm 60 2010-11-27 18:40:53Z gascuel $
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9 ;=============================================================================
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10 ; HISTORY
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11 ; 2010-11-17 : [jDG] Creation...
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12 ;
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13 ; BUGS : repetitive calls to the same CF# color do strange things...
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14
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15 #include printf.inc
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16
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17 ; We need to keep the flags. To avoid trouble of memory alloc, put it in
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18 ; some register untouched by any called function...
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19 #define flags FSR0L
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20
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21 printf_subroutine:
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22 movff TBLPTRL, printf_len ; Save bloc start before parsing
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23
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24 tblrd*+ ; Read flags...
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25 movf TABLAT,W ; Get flags
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26 movwf flags ; and save for later use.
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27
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28 andlw 3 ; Select font bits
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29 bz printf_keep_font ; Keep font ? skip setting
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30 decf WREG ; Minus one make it font size.
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31 movff WREG, win_font
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32
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33 printf_keep_font:
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34 clrf WREG ; Normal or invert video ?
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35 btfsc flags,2
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36 movlw 1
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37 movff WREG, win_invert
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38
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39 btfss flags,3 ; Optional Top/Left position ?
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40 bra printf_no_position
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41
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42 tblrd*+ ; Copy it...
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43 movff TABLAT, win_top
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44 tblrd*+
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45 movff TABLAT, win_leftx2
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46
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47 printf_no_position:
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48 btfss flags,4 ; Optional RRRGGGBB packed color ?
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49 bra printf_no_color8
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50 tblrd*+
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51 movff TABLAT, WREG
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52 call PLED_set_color
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53
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54 printf_no_color8:
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55 btfss flags,5 ; Optional CF color ?
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56 bra printf_no_color_cf
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57 tblrd*+
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58 movff TABLAT, WREG
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59 call getcustom8_1 ; Read CF into WREG
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60 call PLED_set_color ; convert it to 16bits into win_color1:2
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61
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62 printf_no_color_cf:
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63 movf flags,W ; Should we completely skip string copy/append ?
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64 andlw .192
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65 xorlw .192 ; Is command 192 (no string op) ?
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66 bz printf_exec
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67
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68 btfsc flags,7 ; Don't reset FRS2 index ?
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69 bra printf_strcat
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70 lfsr FSR2, letter
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71 bra printf_loop
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72
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73 printf_strcat:
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74 movlw 0x60
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75 cpfslt FSR2L
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76 decf FSR2L
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77
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78 printf_loop: ; Loop over string append byte by byte.
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79 tblrd*+
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80 movff TABLAT, POSTINC2
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81 tstfsz TABLAT
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82 bra printf_loop
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83
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84 printf_exec:
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85 movf printf_len,W ; Get back block start
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86 subwf TBLPTRL,W ; Compute block len
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87 movwf printf_len ; And backup for inline variante
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88
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89 movf flags,W ; Was is a NO-PRINT command ?
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90 addlw .64 ; DEF/CPY/CAT/PRT ->64/128/192/0
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91 btfsc WREG,7 ; Test if 128 or 192 ?
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92 return
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93
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94 ifdef AAFFONTS
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95 goto aa_wordprocessor ; TESTING NEW STRINGWIDTH ROUTINE
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96 else
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97 goto word_processor
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98 endif
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99
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100 ;=============================================================================
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101
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102 printf_inline:
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103 movff TOSU, TBLPTRU ; Transfer return addr to Table ptr
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104 movff TOSH, TBLPTRH
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105 movff TOSL, TBLPTRL
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106
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107 rcall printf_subroutine ; Execute command bloc
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108
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109 movlb 1 ; Restore BANK1 after C-code
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110
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111 ; Round-up block length, so to branch to even addr.
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112 movf printf_len,W ; Get back block len
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113 incf WREG ; Add +1
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114 andlw 0xFE ; Then clean odd bit
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115
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116 ; Then add len to return address
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117 addwf TOSL,F
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118 movlw 0 ; Clear WREG, but keep carry
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119 addwfc TOSH,F
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120 addwfc TOSU,F
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121 return