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1706
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1 *****************************************************************************
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2 * *
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3 * SUBS for RLE picture format *
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4 * *
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5 * RLEshowpic -- Displays picture, using putline routine *
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6 * *
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7 *****************************************************************************
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8
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9 check macro
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10 pshs b,cc
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11 ldb #\1
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12 os9 F$PErr
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13 puls b,cc
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14 endm
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15
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16 ifp1
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17 use /dd/defs/os9defs.a
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18 endc
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19
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20 psect view_rle_a,0,0,0,0,0
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21
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22 vsect dp
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23 double rmb 1 Yes, double each line, and double each pixel count.
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24 endsect
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25
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26 RLEshowpic:
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27 bsr header Read header info, set palettes, etc.
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28
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29 lbsr setscreen
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30 lbsr setpals
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31 lbsr setbuffer
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32
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33 ldd #0
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34 showpicloop
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35 lbsr getline
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36 lbsr putline
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37 tst double
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38 beq nodoub
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39 lbsr putline
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40 nodoub
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41 addd #1
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42 cmpd #192
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43 bne showpicloop
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44 rts
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45
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46 *
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47 * read header info from file, and set window type information
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48 *
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49 vsect dp
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50 endoffile rmb 1
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51 endsect
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52
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53
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54 header
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55 pshs a,b,x,y,u
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56 ldd #$003f Set palettes to white on black
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57 std palette,y
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58 lda #6
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59 sta <type
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60
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61 head0
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62 lbsr I_GetByte The start of an RLE picture is an ESC G sequence.
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63 lbcs _error
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64 cmpa #27
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65 bne head0
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66 head1
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67 lbsr I_GetByte
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68 lbcs _error
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69 cmpa #27
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70 beq head1
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71 cmpa #'G
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72 bne head0
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73
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74 lbsr I_GetByte
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75 lbcs _error
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76 cmpa #'H
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77 beq headmisc
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78 cmpa #'M
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79 lbne E$Format Illegal format!
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80 com double Turn on double flag.
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81
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82 headmisc
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83 * Set some miscellaneous variables
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84 clr <cyclestart
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85 lda #1
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86 sta <cycleend So we can toggle black/white
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87 ldd #120
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88 std <cyclerate
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89
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90 clr <cycle Turn off cycling
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91 clr <extranum No color rotation
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92 ldd <Skiplines
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93 cmpd #$ffff Is Skiplines still default?
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94 bne headskip No, don't change it.
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95 ldd #0
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96 std <Skiplines Set it to 0
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97 headskip
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98 puls a,b,x,y,u,pc
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99
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100 vsect dp
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101 mask fcb $40 Mask to set a pixel
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102 foreground rmb 1 In foreground or background? default=0.
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103 count rmb 1
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104 endsect
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105
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106 *
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107 * Getline
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108 *
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109 getline
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110 pshs a,b,x,y,u
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111 * Clear out linebuff
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112 leau linebuff,y
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113 ldb #160
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114 getline3
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115 clr ,u+
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116 decb
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117 bne getline3
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118 * If at end of file, leave it that way
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119 tst endoffile
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120 lbne getline1
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121 * Get a line from the file
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122 leax linebuff+8,y
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123 clrb
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124 lda count
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125 bne setdoit
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126 getbyte
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127 com foreground
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128 lbsr I_GetByte
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129 bcs geteof
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130 suba #$20
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131 blo getbyte
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132 tst double
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133 beq setdoit
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134 lsla Double count.
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135 setdoit
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136 sta count
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137 beq getbyte
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138 setloop
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139 bsr pixset Set/reset this pixel
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140 dec count
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141 decb Count down pixels on line
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142 beq getline1
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143 tst count
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144 beq getbyte End of repeat, get another byte.
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145 bra setloop End of line, save leftover and quit.
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146 * Handle EOF situation, any I/O error should come here.
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147 geteof
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148 cmpb #E$EOF
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149 bne getline4
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150 com endoffile
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151 bra getline1
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152 getline4
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153 lbra _error If not EOF, just exit with error.
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154 getline1
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155 puls a,b,x,y,u,pc
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156
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157 pixset
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158 pshs a
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159 tst foreground
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160 bne pixreset If in background, don't set the pixel.
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161 lda ,x
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162 ora mask
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163 sta ,x
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164 andcc #^Carry clear the carry flag.
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165 pixreset
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166 ror mask
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167 bcc pixend If we went past the end of the byte,
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168 ror mask Get the two mask bits out of the carry
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169 leax 1,x Bump X to next byte.
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170 pixend
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171 ror mask
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172 puls a,pc
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173
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174 endsect
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