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1 ;=============================================================================
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2 ;
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3 ; File File color_processor.asm combined next generation V3.03.2
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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 has 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 ; Outputs 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, encoding version
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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 <= 126
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29 ; * image width is even
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30 ; * image left border is on even column, too
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31 ;
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32 ;
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33 ; Compressed format in encoding version 0 and 1:
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34 ; ----------------------------------------------
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35 ; - 1-3 bytes pixel repetition count, followed by 1 byte pixel color
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36 ; - bit 7 = 1: byte holds pixel count in bits 6-0
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37 ; - bit 7 = 0: byte holds pixel color in bits 6-0
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38 ; - all pixel count bytes accumulate:
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39 ; - 1 byte pixel count: 1xxxxxxx -> 7 bit pixel count
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40 ; - 2 bytes pixel count: 1yyyyyyy 1xxxxxxx -> 14 bit pixel count
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41 ; - 3 bytes pixel count: 1zzzzzzz 1yyyyyyy 1xxxxxxx -> 21 bit pixel count
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42 ;
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43 ; A pixel repetition count of 0 means one single pixel will be drawn,
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44 ; a repetition count of 1 means two pixels will be drawn, and so on.
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45 ; The image is done when all pixels as of width x high parameters have been printed.
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46 ;
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47 ;
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48 ; Compressed format in encoding version 1:
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49 ; ----------------------------------------
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50 ; As above, but the image is done when a color index equaling 127 is encountered.
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51 ;
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52 ;
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53 ; Pixels are written column by column from left to right, with columns down first.
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54 ;
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55 ;-----------------------------------------------------------------------------
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56
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57 #include "hwos.inc"
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58 #include "tft.inc"
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59
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60 extern convert_for_display2
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61
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62
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63 color_proc CODE
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64
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65 ;-----------------------------------------------------------------------------
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66
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67 global color_image
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68 color_image:
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69 tblrd*+ ; read image width (in true width / 2)
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70 movff TABLAT,win_width
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71 tblrd*+ ; read image height
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72 movff TABLAT,win_height
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73 rcall get_colors ; read the colors
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74
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75 tstfsz encoding_format ; image encoded in version 0 format?
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76 bra color_image_1 ; NO
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77
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78 ; image encoding version 0 format: compute the overall number of pixels - 1 to draw
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79 movf win_width,W ; get width into WREG
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80 mulwf win_height ; multiply by hight
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81 movff PRODL,overall_pixels+0 ; store product, low byte
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82 movff PRODH,overall_pixels+1 ; ... high byte
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83 clrf overall_pixels+2 ; clear upper byte
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84 bcf STATUS,C ; clear carry flag
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85 rlcf overall_pixels+0 ; multiply by 2 via shift left, low byte
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86 rlcf overall_pixels+1 ; ... high byte
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87 rlcf overall_pixels+2 ; ... upper byte
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88 clrf WREG ; decrement by 1 to ease all pixel done detection
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89 decf overall_pixels+0,F ; ...
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90 subwfb overall_pixels+1,F ; ...
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91 subwfb overall_pixels+2,F ; ...
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92
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93 color_image_1:
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94 clrf win_width+1 ; clear width, high byte
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95 bcf STATUS,C ; clear carry flag
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96 rlcf win_width+0 ; multiply width x 2 to get the true box width
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97 rlcf win_width+1 ; ...
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98 call TFT_box_write ; set output box
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99 Index_out 0x22 ; frame memory data write start
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100
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101 color_image_loop_xy:
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102 ; prepare to read next pixel count and color
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103 clrf pixel_count+0 ; clear number of pixels
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104 clrf pixel_count+1 ; ...
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105
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106 color_image_read_byte:
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107 tblrd*+ ; get next byte
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108 btfss TABLAT,7 ; high bit cleared ?
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109 bra color_image_decode_color; YES - this is a color byte
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110 ;bra color_image_decode_count; NO - this is a pixel count byte
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111
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112 color_image_decode_count:
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113 ; decode pixel repetition count
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114 rlcf TABLAT,F ; drop high bit
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115 movlw .7 ; move 7 bits
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116 color_image_decode_count_loop:
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117 rlcf TABLAT,F ; get upper bit into carry
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118 rlcf pixel_count+0,F ; push bit into pixel count (16 bit operation)
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119 rlcf pixel_count+1,F ; ...
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120 decfsz WREG ; decrement loop counter, all bits done?
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121 bra color_image_decode_count_loop ; NO - loop
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122 bra color_image_read_byte ; YES - decode next byte
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123
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124 color_image_decode_color:
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125 ; check for end-of-image tag (color index = 0x7F) -- it is assumed that no version 0 image contains 127 colors...
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126 movlw 0x7f ; encoding for end-of-image
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127 cpfslt TABLAT ; color index < end-of-image tag?
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128 return ; NO - done
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129
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130 ; get pixel color into PROD
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131 lfsr FSR2,buffer ; set FSR2 pointer to base address of color table
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132 rlncf TABLAT,W ; get color index * 2 into WREG
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133 movwf FSR2L ; adjust pointer to selected color
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134 movff POSTINC2,PRODL ; read color, low byte
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135 movff POSTINC2,PRODH ; read color, high byte
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136
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137 tstfsz encoding_format ; image encoded in version 0 format?
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138 bra color_image_pixel ; NO
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139 ; image encoding version 0 format: subtract pixel count from the overall number of pixels to do
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140 movf pixel_count+0,W ; YES - 24 bit subtraction, low byte
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141 subwf overall_pixels+0,F ; ...
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142 movf pixel_count+1,W ; ... high byte
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143 subwfb overall_pixels+1,F ; ...
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144 movlw .0 ; ... upper byte
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145 subwfb overall_pixels+2,F ; ...
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146
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147 color_image_pixel:
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148 ; prepare sending of pixels to display
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149 infsnz pixel_count+0 ; increment pixel repetition count by 1
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150 incf pixel_count+1 ; ...
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151 incf pixel_count+1 ; because decrement is done first, increment high byte once more
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152 bsf tft_rs,0 ; RS_H data
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153 bcf INTCON,GIE ; disable global interrupts
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154
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155 btfsc screen_type2 ; display type 2 ?
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156 bra color_image_display2 ; YES
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157 movff PRODH,PORTA ; NO - move color high byte to PORTA
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158 movff PRODL,PORTH ; - move color low byte to PORTH
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159
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160 color_image_pixel1_loop:
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161 bcf tft_nwr ; toggle write signal
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162 bsf tft_nwr ; ...
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163 decfsz pixel_count+0 ; decrement pixel counter, low byte
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164 bra color_image_pixel1_loop ; loop if not zero
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165 decfsz pixel_count+1 ; decrement pixel counter, high byte
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166 bra color_image_pixel1_loop ; loop if not zero
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167 bra color_image_pixel_com ; all pixels transmitted
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168
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169 color_image_display2:
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170 call convert_for_display2 ; convert 16 bit RGB b'RRRRRGGG GGGBBBBB'
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171 ; into 24 bit RGB b'RRRRRR00 GGGGGG00 BBBBBB00'
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172 color_image_pixel2_loop:
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173 movff win_color5,PORTH ; move upper byte to PORTH (DISPLAY is big endian)
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174 bcf tft_nwr ; toggle write signal
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175 bsf tft_nwr ; ...
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176 movff win_color4,PORTH ; move high byte to PORTH
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177 bcf tft_nwr ; toggle write signal
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178 bsf tft_nwr ; ...
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179 movff win_color3,PORTH ; move low byte to PORTH
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180 bcf tft_nwr ; toggle write signal
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181 bsf tft_nwr ; ...
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182 decfsz pixel_count+0 ; decrement pixel counter, low byte
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183 bra color_image_pixel2_loop ; loop if not zero
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184 decfsz pixel_count+1 ; decrement pixel counter, high byte
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185 bra color_image_pixel2_loop ; loop if not zero
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186
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187 color_image_pixel_com:
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188 bsf INTCON,GIE ; re-enable global interrupts
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189
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190 tstfsz encoding_format ; image encoded in version 0 format?
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191 bra color_image_loop_xy ; NO - loop to process next byte from image data
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192
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193 ; image encoding version 0 format: step counter
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194 clrf WREG ; make a 24 bit decrement
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195 decf overall_pixels+0 ; ...
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196 subwfb overall_pixels+1,F ; ...
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197 subwfb overall_pixels+2,F ; ...
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198 bnn color_image_loop_xy ; all pixels done? NO - loop
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199 return ; YES - done
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200
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201
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202 global get_colors
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203 get_colors:
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204 tblrd*+ ; read number of image colors
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205 movff TABLAT,lo ; store in lo
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206 movf lo,W
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207 tblrd*+ ; read image encoding format
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208 movff TABLAT,encoding_format ; store encoding format
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209 lfsr FSR2,buffer ; set up buffer as storage for the colors
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210 get_colors_loop:
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211 tblrd*+ ; read color from stored image, low byte
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212 btfss use_custom_colors ; shall use custom colors?
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213 movff TABLAT,POSTINC2 ; NO - copy color read to buffer
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214 tblrd*+ ; read color from stored image, high byte
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215 btfss use_custom_colors ; shall use custom colors?
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216 movff TABLAT,POSTINC2 ; NO - copy color read to buffer
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217 decfsz WREG ; decrement loop counter, done?
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218 bra get_colors_loop ; NO - loop
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219 bcf use_custom_colors ; YES - clear custom colors request
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220 return ; - done
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221
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222 END
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