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1 ;=============================================================================
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2 ;
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3 ; File File color_processor.asm
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4 ;
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5 ; Decompress and draw an image.
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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 ; 2010-12-13 : [jDG] Creation.
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11 ; 2010-12-30 : [jDG] Revised to put temp into ACCESSRAM0
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12 ;
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13 ; RATIONALS: The OSTC have a nice color screen, and a std geek attitude impose
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14 ; to show off ... ;-)
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15 ;
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16 ; Inputs: TBLPTR points to the image description block.
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17 ; win_top, win_leftx2 the Top/Leftx2 corner here to put the image.
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18 ; Ouputs: None.
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19 ; Trashed: TBLPTR, TABLAT, FSR2, PROD, win_width, win_height
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20 ;
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21 ; ImageBloc:
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22 ; db widthx2, height
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23 ; db nbColors, 0 ; Unused yet... Should be 0 to keep packing happy.
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24 ; dw color0, color1, color2, color3, ...
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25 ; db ...packed pixels...
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26 ;
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27 ; Limitations:
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28 ; * nbColors should be <= 15.
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29 ; * image width should be even.
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30 ; * image left border should be on even position too.
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31 ; Compressed format:
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32 ; - Upper nibble = color, lower nibble = count-1.
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33 ; - All bytes F* accumulates to make count larger than 16.
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34 ; Eg. 00 is 1 pixel color 0
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35 ; 07 is 8 pixels color 0
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36 ; 70 is 1 pixel color 7
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37 ; bf is 16 pixels of color .11
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38 ; F1 F2 F3 04 is 0x1235 pixels of color 0.
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39 ;
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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 ;-----------------------------------------------------------------------------
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46 ; Temporary overlay (in bank 1).
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47
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48 CBLOCK tmp ; Data overlay in reserved tmp area.
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49 img_colors:1
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50 img_pixels:3
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51 img_count:2
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52 ; Reserved to tmp+0x07...
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53 ENDC
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54
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55 ;-----------------------------------------------------------------------------
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56 ;
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57 ; Note: Some variables (win_width, win_height) are in BANK0 !
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58 basic CODE
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59 global color_image
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60 color_image:
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61 banksel win_width ; Bank1, just to be sure...
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62
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63 ;---- Get image parameters -------------------------------------------
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64 tblrd*+
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65 movff TABLAT,win_width
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66 tblrd*+
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67 movff TABLAT,win_height
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68 tblrd*+
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69 movff TABLAT,img_colors
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70 tblrd*+ ; Skip one byte (future flags ?)
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71 ;---- Copy color table -----------------------------------------------
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72 movf img_colors,W
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73 lfsr FSR2,buffer
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74 get_colors_loop:
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75 tblrd*+
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76 movff TABLAT,POSTINC2
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77 tblrd*+
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78 movff TABLAT,POSTINC2
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79 decfsz WREG
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80 bra get_colors_loop
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81
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82 ; Compute width * height * 2 : the number of pixels to write.
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83 clrf img_pixels+2
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84 movf win_width,W ; Compute number of pixels to draw
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85 mulwf win_height ; 0 .. 160x240
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86 bcf STATUS,C ; BEWARE: mulwf does not reset carry flag !
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87 rlcf PRODL ; x2 --> 0 .. 320x240, might be > 0xFFFF
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88 rlcf PRODH
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89 movff PRODL, img_pixels+0
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90 movff PRODH, img_pixels+1
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91 rlcf img_pixels+2 ; Get the upper bit in place.
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92
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93 clrf WREG ; Decrement count to ease end detection.
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94 decf img_pixels+0,F
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95 subwfb img_pixels+1,F
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96 subwfb img_pixels+2,F
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97
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98 ;---- Send window command --------------------------------------------
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99 clrf win_width+1 ; x2 on width, for the true box size.
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100 rlcf win_width+0
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101 rlcf win_width+1
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102 call TFT_box_write
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103 Index_out 0x22
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104
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105 ;---- Decode pixels --------------------------------------------------
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106 color_image_loop_xy:
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107 ; Get pixel count
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108 clrf img_count+0
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109 clrf img_count+1
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110
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111 ;---- Decode repetition count
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112 color_image_decode_1:
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113 tblrd*+ ; Get one byte
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114
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115 btfss TABLAT,7 ; High bit cleared ?
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116 bra color_image_decode_2 ; YES: this is a color byte.
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117
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118 rlcf TABLAT,F ; Drop high bit.
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119 movlw .7 ; Move 7 bits
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120 color_image_decode_3:
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121 rlcf TABLAT,F ; Get bit into carry
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122 rlcf img_count+0,F ; Push into pixel count
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123 rlcf img_count+1,F
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124 decfsz WREG
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125 bra color_image_decode_3 ; and loop foreach 7 bits.
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126
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127 bra color_image_decode_1 ; Decode next byte.
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128
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129 color_image_decode_2:
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130 ;---- Get pixel color into PROD
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131 movf TABLAT,W ; Get color index.
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132 addwf WREG ; *2
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133 lfsr FSR2,buffer ; Reinitialize color table.
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134 movff WREG,FSR2L ; LOW(buffer) == 0
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135 movff POSTINC2,PRODL
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136 movff POSTINC2,PRODH
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137
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138 ; Substract count-1 from the number of pixel we should do.
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139 movf img_count+0,W ; Make a 24bit substraction.
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140 subwf img_pixels+0,F
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141 movf img_count+1,W
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142 subwfb img_pixels+1,F
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143 movlw 0
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144 subwfb img_pixels+2,F
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145
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146 color_image_not_over:
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147 infsnz img_count+0 ; Increment count.
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148 incf img_count+1
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149
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150 ; Loop sending pixel color
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151 incf img_count+1 ; Because we decrement first, should add one here !
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152 bsf tft_rs,0 ; RS_H ; Data
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153 movff PRODH,PORTA ; Move high byte to PORTA
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154 movff PRODL,PORTH ; Move low byte to PORTH
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155 color_image_loop_pixel:
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156 bcf tft_nwr,0 ; WR_L
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157 bsf tft_nwr,0 ; WR_H ; Tick
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158 decfsz img_count+0
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159 bra color_image_loop_pixel
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160 decfsz img_count+1
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161 bra color_image_loop_pixel
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162
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163 ; And count (on a 24bit counter)
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164 clrf WREG ; Make a 24bit decrement.
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165 decf img_pixels+0
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166 subwfb img_pixels+1,F
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167 subwfb img_pixels+2,F
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168
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169 bnn color_image_loop_xy ; Not finished ? loop...
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170
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171 ;---- Closeup --------------------------------------------------------
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172 Index_out 0x00
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173 return
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174
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175 end |
