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1 ;=============================================================================
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2 ;
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3 ; File aa_wordprocessor.asm
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4 ;
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5 ; Anti-aliased word processor
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6 ;
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7 ; Copyright (c) 2011, JD Gascuel, HeinrichsWeikamp, all right reserved.
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8 ;=============================================================================
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9 ; HISTORY
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10 ; 2010-11-22 : [jDG] Creation.
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11 ; 2010-12-01 : [jDG] Adding 3bits antialiased fonts.
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12 ; 2010-12-30 : [jDG] Revised to put temp into ACCESSRAM0
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13 ; 2012-08-12 : [mH] Moved font28 into bootloader section 0x1C000
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14 ;
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15 ; BUGS :
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16 ; * If the three fonts are not in the same half of the PROM memory, TBLPTRU
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17 ; will be badly set, and font48 or font90 will display giberish...
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18 ;=============================================================================
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19 ;
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20 ; MEMORY FOOTPRINT:
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21 ;------------------
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22 ;
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23 ; wp_wordprocessor : 8KB, including fonts.
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24 ; aa_wordprocessor : 0.5KB code
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25 ; + 3.5KB aa_font28 (reduced to 99 chars)
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26 ; + 1.6KB aa_font48
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27 ; + 2.2KB aa_font90
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28 ; = 7.9 KB including fonts...
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29 ;
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30 ; Input registers:
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31 ; buffer:26 String to print.
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32 ; win_font Font size (0=tiny, 1=small, 2=medium, 3=large)
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33 ; win_color1:2 16bits unpacked color
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34 ; win_top, win_leftx2 Position on screen
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35 ; win_inverse Inverse video mode.
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36 ;
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37 ; Available general purpose registers:
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38 ; PRODH, PRODL (needed for array indexing)
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39 ; FSRx 12bits. Usefull as RAM pointers.
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40 ;=============================================================================
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41
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42 #include "ostc3.inc"
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43 #include "tft.inc"
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44
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45 extern aa_font16_block
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46 extern aa_font28_block
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47 extern aa_font36_block
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48 extern aa_font48_block
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49 extern aa_font90_block
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50
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51 ;=============================================================================
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52 ; Temporary variables are overlayed in Bank 1, used also by C-code
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53 ; (p2_deco), MPLAB math and stdlib libraries.
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54
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55 CBLOCK tmp ; Data overlay in reserved tmp area.
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56 aa_flags:1 ; Various flags for aa_wordprocessor
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57 aa_bitlen:1 ; Count of pixels when decoding bitmaps.
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58 aa_start:2 ; PROM ptr to start of encoded bitmap
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59 aa_end:2 ; and end of it.
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60 aa_temp:2 ; Current color, divided by 2 or 4
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61 ; Reserved to tmp+0x07...
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62 ENDC
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63 ; Flags allocation:
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64 #define aa_antialias aa_flags,0
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65 #define aa_color_quart aa_flags,1
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66 #define aa_color_half aa_flags,2
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67
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68 ;------------------------------------------------------------------------------
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69 ; Setup pointers for a char:
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70 ; Inputs WREG = char to draw, win_font
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71 ; Output aa_start, aa_end, win_height, aa_flags
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72 ; Trashed PRODH, PRODL, TBLPTR, TABLAT
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73 ;
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74 basic CODE
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75 aa_char_setup:
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76 movwf PRODL ; save char into PROD for now.
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77
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78 movf win_font,W,BANKED ; Get font number (updates Z flag)
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79 bnz aa_char_1
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80
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81 ; TINY font ---------------------------------------------------------
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82 ; Font TINY character folding...
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83 aa_char_0:
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84 movlw LOW aa_font16_block
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85 movwf TBLPTRL
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86 movlw HIGH aa_font16_block
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87 movwf TBLPTRH
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88 movlw UPPER aa_font16_block
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89 movwf TBLPTRU
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90 bra aa_char_99
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91
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92 ; SMALL font ---------------------------------------------------------
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93 ; Font SMALL character folding...
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94 aa_char_1:
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95 decfsz WREG ; This is small font ???
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96 bra aa_char_2
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97
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98 movlw LOW aa_font28_block
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99 movwf TBLPTRL
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100 movlw HIGH aa_font28_block
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101 movwf TBLPTRH
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102 movlw UPPER aa_font28_block
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103 movwf TBLPTRU
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104 bra aa_char_99
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105
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106 ; STD font -----------------------------------------------------------
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107 ; Font SMALL character folding...
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108 aa_char_2:
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109 decfsz WREG ; This is small font ???
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110 bra aa_char_3
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111
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112 movlw LOW aa_font36_block
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113 movwf TBLPTRL
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114 movlw HIGH aa_font36_block
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115 movwf TBLPTRH
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116 movlw UPPER aa_font36_block
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117 movwf TBLPTRU
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118 bra aa_char_99
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119
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120 ; MEDIUM font --------------------------------------------------------
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121 aa_char_3:
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122 decfsz WREG ; This is medium font ???
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123 bra aa_char_4
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124
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125 ; Font MEDIUM block:
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126 movlw LOW aa_font48_block
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127 movwf TBLPTRL
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128 movlw HIGH aa_font48_block
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129 movwf TBLPTRH
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130 movlw UPPER aa_font48_block
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131 movwf TBLPTRU
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132 bra aa_char_99
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133
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134 ; LARGE font ---------------------------------------------------------
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135 aa_char_4:
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136 ; Font LARGE block:
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137 movlw LOW aa_font90_block
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138 movwf TBLPTRL
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139 movlw HIGH aa_font90_block
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140 movwf TBLPTRH
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141 movlw UPPER aa_font90_block
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142 movwf TBLPTRU
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143
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144 ; Execute font block -------------------------------------------------
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145 aa_char_99:
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146 ; This is safe if the three fonts are in the same code segment
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147 ; (and that segment do not span the 64K edge...)
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148 movlw UPPER aa_font16_block
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149 movwf TBLPTRU
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150
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151 ; Proceed to character substitutions
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152 aa_char_30:
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153 tblrd*+ ; Read FROM char
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154 movf TABLAT,W ; Get it, and set Z,N
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155 bz aa_char_32 ; Break at end of translations
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156
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157 tblrd*+ ; Read TO char
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158 cpfseq PRODL ; FROM == current char ?
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159 bra aa_char_30 ; Different: loop
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160 movff TABLAT, PRODL ; make substitution
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161 bra aa_char_30 ; Loop.
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162
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163 ; Make sure char is in the available range
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164 aa_char_32:
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165 tblrd*+ ; Read first char
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166 movf TABLAT,W ; get it.
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167 subwf PRODL,F ; (char - first) --> PRODL
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168
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169 tblrd*+ ; Read nb chars
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170 movf TABLAT,W ; nbchars --> WREG
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171 tblrd*+ ; Read default char
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172 cpfslt PRODL ; if char > WREG ?
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173 movff TABLAT,PRODL ; replace PRODL
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174
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175 ; Decode font height and anti-aliasing mode
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176 clrf aa_flags ; Default to no AA
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177 tblrd*+ ; Read font height + AA flag
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178 movf TABLAT,W ; into WREG
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179 bnn aa_char_34 ; High bit set ?
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180 bsf aa_antialias ; YES : then the font is AA.
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181 aa_char_34:
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182 andlw 0x7F ; Keep just font height,
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183 movwf win_height,BANKED ; then save it (its a register)
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184
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185 ; Set PROM pointer to the char index
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186 movf PRODL,W ; Read back char
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187 mullw 2 ; PROD = 2*(char - base), TBLPTR=idx
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188 movf PRODL,W
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189 addwf TBLPTRL,F ; Add into TBLPTR (low byte)
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190 movf PRODH,W
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191 addwfc TBLPTRH,F ; and high byte.
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192
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193 ; Read start and stop pointers
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194 tblrd*+ ; aa_start = PROM16(*tblptr++)
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195 movff TABLAT,aa_start+0 ; Read low byte
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196 tblrd*+
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197 movff TABLAT,aa_start+1 ; and high byte
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198
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199 tblrd*+ ; aa_end = PROM16(*tblptr++)
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200 movff TABLAT,aa_end+0 ; Read low byte
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201 tblrd*+
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202 movff TABLAT,aa_end+1 ; and high byte
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203
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204 return
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205
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206 ;------------------------------------------------------------------------------
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207 ; Character width
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208 ; Inputs aa_start, aa_end, win_width, win_height, aa_flags
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209 ; Output width added to win_width
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210 ; Trashed aa_bitlen, TBLPTR, TABLAT
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211 ;
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212 aa_char_width:
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213 movff aa_start+0, TBLPTRL ; TBLPTR = aa_start
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214 movff aa_start+1, TBLPTRH
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215 clrf aa_bitlen ; clear reminders...
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216
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217 ; Read bitmap byte, and decode length:
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218 aa_char_width_1:
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219 ifdef AA_BYTE_SWAP
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220 btg TBLPTRL,0 ; Toggle low ptr bit.
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221 tblrd*
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222 movf TABLAT,W ; Store to WREG
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223 btg TBLPTRL,0 ; Get is back
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224 tblrd*+ ; then increment (but trash TABLAT)
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225 movwf TABLAT ; Then restore copy to TABLAT.
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226 else
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227 tblrd*+ ; Normal read...
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228 movf TABLAT,W ; Store copy to WREG
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229 endif
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230 btfss aa_antialias ; Antialiased font ?
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231 bra aa_char_width_10 ; No: always 7 bits count
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232
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233 bn aa_char_width_10 ; Non-white pixels ?
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234 andlw 0x1F ; Yes : 5 bits count.
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235 aa_char_width_10:
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236 andlw 0x7F ; No: 7 bit count.
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237 incf WREG ; WREG = repetition count
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238 addwf aa_bitlen,F ; Add remaining pixels from last code.
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239
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240 movf win_height,W,BANKED ; WREG = - height
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241 negf WREG
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242
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243 ; This is a hand-made division by successive substraction of height
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244 aa_char_width_2:
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245 addwf aa_bitlen,F ; Try to substract win_height
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246 bn aa_char_width_3 ; If neg it was a bad idea...
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247
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248 infsnz win_width+0,F ; Succeded: do a 16bit increment
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249 incf win_width+1,F ; on the win_width counter.
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250 bra aa_char_width_2 ; and loop.
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251
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252 aa_char_width_3:
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253 negf WREG ; WREG = +height
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254 addwf aa_bitlen,F ; Restore true reminder.
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255
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256 ; Are we done ?
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257 movf TBLPTRL,W ; Compare TBLPTR to aa_end
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258 cpfseq aa_end+0
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259 bra aa_char_width_1 ; Loop if LOW is different
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260 movf TBLPTRH,W
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261 cpfseq aa_end+1 ; Loop to if HIGH is different
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262 bra aa_char_width_1
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263
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264 return
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265
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266 ;------------------------------------------------------------------------------
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267 ; String width
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268 ; Inputs buffer (SHOULD BE NULL TERMINATED)
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269 ; Output win_width, win_height
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270 ; Trashed PROD, TBLPTR, FSR2, aa_bitlen, aa_start, aa_end, aa_flags
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271 ;
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272 aa_string_width:
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273 lfsr FSR2, buffer ; FSR2 pointer to start of string.
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274
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275 clrf win_width+0 ; Clear width sum.
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276 clrf win_width+1 ; (16 bit counter)
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277
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278 aa_string_width_1:
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279 movf POSTINC2,W ; WREG = *FSR2++
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280 bz aa_string_width99 ; Exit if null byte encountered.
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281
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282 rcall aa_char_setup ; setup aa_start / aa_end
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283 rcall aa_char_width ; sum-up width into win_width
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284 bra aa_string_width_1 ; and loop.
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285
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286 aa_string_width99:
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287 return
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288
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289 ;------------------------------------------------------------------------------
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290 ; Decode a compressed char.
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291 ; Inputs aa_start, aa_end, win_height, win_invert, win_color1, win_color2
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292 ; Output none
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293 ; Trashed TBLPTR, TABLAT, PROD, aa_bitlen, aa_flags, aa_colorDir:2
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294 ;
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295 aa_decode_char:
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296 movff aa_start+0, TBLPTRL ; TBLPTR = aa_start
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297 movff aa_start+1, TBLPTRH
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298
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299 ; Read bitmap byte, and decode color & length
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300 aa_decode_1:
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301 ifdef AA_BYTE_SWAP
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302 btg TBLPTRL,0 ; Toggle low ptr bit.
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303 tblrd*
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304 movf TABLAT,W ; Store to WREG
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305 btg TBLPTRL,0 ; Get is back
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306 tblrd*+ ; then increment (but trash TABLAT)
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307 movwf TABLAT ; Then restore copy to TABLAT.
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308 else
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309 tblrd*+ ; Normal read...
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310 movf TABLAT,W ; Store copy to WREG
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311 endif
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312 btfss aa_antialias ; Antialiased font ?
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313 bra aa_decode_10 ; No: always 7 bits count
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314 bn aa_decode_10 ; Non-white pixels ?
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315 andlw 0x1F ; Yes : 5 bits count.
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316 aa_decode_10:
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317 andlw 0x7F ; No: 7 bit count.
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318 incf WREG
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319 movwf aa_bitlen ; repetition count --> aa_bitlen
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320
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321 ;---- COLOR DECODING -------------------------------------------------
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322 ;
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323 ; Code Normal Inverse
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324 ; 1xx 0% 100% : Managed by aa_decode_13
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325 ; 011 25% 75%
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326 ; 010 50% 50%
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327 ; 001 75% 25%
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328 ; 000 100% 0% : Managed by aa_decode_13 too.
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329 ;
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330 movf TABLAT,W ; Get back code
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331 btfss aa_antialias ; Antialiased font ?
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332 bra aa_decode_13 ; NO: 1bit case
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333
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334 ; Asymetry test: 1xx code is another case for 1bit color.
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335 ; This have to be done before inverse video, because
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336 ; of the asymetric processing !
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337 bn aa_decode_13 ; decode as not-aa
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338
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339 ; Manage 000 special case too:
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340 andlw 0xE0 ; Select color bits
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341 bz aa_decode_13 ; That's a 000 !
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342
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343 ; Apply reverse video, in a reversed way
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344 btfss win_invert,0 ; Inverse video mode ?
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345 sublw 0x80
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346
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347 ; Move the two bits to aa_color_half and aa_color_quarter:
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348 swapf WREG ; --> 0000.0LL0 byte
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349 iorlw b'001' ; We are in AA mode, don't forget it !
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350 movwf aa_flags ; save that to aa_color_(half/quad)/AA flags.
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351
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352 ;---- 2 bit x RGB(16bits) computation --------------------------------
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353 clrf PRODL ; We will accumulate result here...
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354 clrf PRODH
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355
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356 ; Take color div 2 into aa_temp. Max red = 15/31
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357 rrcf win_color1,W,BANKED ; xRRRRxGG
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358 andlw b'01111011' ; 0RRRR0GG (don't change C)
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359 movwf aa_temp+0
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360 rrcf win_color2,W,BANKED ; GGGxBBBB
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361 andlw b'11101111' ; GGG0BBBB
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362 movwf aa_temp+1
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363
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364 btfss aa_color_half
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365 bra aa_decode_12
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366
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367 movff aa_temp+0,PRODH ; Add color/2 if bit set.
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368 movff aa_temp+1,PRODL ; TFT is big endian, so swap here.
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369 aa_decode_12:
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370 btfss aa_color_quart
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371 bra aa_decode_3
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372
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373 ; Divide it once again by 2. Max red = 7/31.
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374 rrcf aa_temp+0,W ; xxRRRxxG
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375 andlw b'00111001' ; 00RRR00G (don't change C)
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376 movwf aa_temp+0
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377 rrcf aa_temp+1,W ; GGGxxBBB
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378 andlw b'11100111' ; GGG00BBB
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379 movwf aa_temp+1
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380
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381 movf aa_temp+1,W ; Add color/4
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382 addwf PRODL,F ; NOTE: 7/31+15/31=22/31,
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383 movf aa_temp+0,W ; hence composants won't overlap.
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384 addwfc PRODH,F ; In right order, to propagate carry.
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385
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386 bra aa_decode_3 ; Done.
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387
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388 ; ---- Simple BLACK and WHITE cases ------------------------------
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389 aa_decode_13: ; Got a 1xx or a 000 code...
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390 btfsc win_invert,0 ; Inverse video mode ?
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391 xorlw 0x80 ; YES: invert levels.
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392 bn aa_decode_2 ; Then test high bit.
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393
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394 ; WHITE pixel (ie. full color)
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395 bsf tft_rs,0 ; RS_H ; Data
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396 movff win_color1,PORTA ; current draw color
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397 movff win_color2,PORTH ; (rem: TFT is big endian)
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398 bra aa_decode_4
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399
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400 aa_decode_2:
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401 bsf tft_rs,0 ; RS_H ; Data
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402 clrf PORTA ; BLACK pixel
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403 clrf PORTH
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404 bra aa_decode_4
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405
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406 aa_decode_3:
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407 bsf tft_rs,0 ; RS_H ; Data
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408 movff PRODH,PORTA ; Move high byte to PORTA
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409 movff PRODL,PORTH ; Move low byte to PORTH
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410 aa_decode_4:
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411 ;---- PIXEL WRITE LOOP -----------------------------------------------
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412 bcf tft_nwr,0 ; WR_L
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413 bsf tft_nwr,0 ; WR_H ; Tick
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414
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415 decf aa_bitlen,F
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416 bnz aa_decode_4
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417
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418 ;---- BYTE-CODE LOOP -------------------------------------------------
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419 ; Are we done ?
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420 movf TBLPTRL,W ; Compare TBLPTR to aa_end
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421 cpfseq aa_end+0
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422 bra aa_decode_1 ; Loop if LOW is different
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423 movf TBLPTRH,W
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424 cpfseq aa_end+1 ; Loop to if HIGH is different
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425 bra aa_decode_1
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426
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427 return
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428
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429 ;------------------------------------------------------------------------------
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430 ; Setup pointers for a char:
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431 ; Inputs : buffer : string to print (SHOULD BE NULL TERMINATED)
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432 ; Output : TFT commands on port D + clocks.
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433 ;
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434 global aa_wordprocessor ; Callable from C-code.
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435 aa_wordprocessor:
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436 banksel win_font ; Bank1, just to be sure.
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437 rcall aa_string_width ; Set win_height, compute win_width
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438 call TFT_box_write ; Use that for the box.
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439
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440 ; Restart the loop for each char to print
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441 lfsr FSR2, buffer ; FSR2 pointer to start of string.
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442
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443 ; DATA bloc commande:
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444 Index_out 0x22
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445
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446 aa_wordprocessor_1:
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447 movf POSTINC2,W ; WREG = *FSR2++
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448 bz aa_wordprocessor_99 ; Exit if null byte encountered.
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449
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450 rcall aa_char_setup ; setup aa_start / aa_end
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451 rcall aa_decode_char ; write pixels to screen
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452 bra aa_wordprocessor_1 ; and loop.
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453
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454 aa_wordprocessor_99:
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455 ; END of bloc commande
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456 Index_out 0x00
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457
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458 return
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459 END |
