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1706
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1 *****************************************************************************
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2 * *
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3 * SUBS for vef picture format *
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4 * *
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5 * VEFshowpic -- 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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1912
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17 use os9defs.d
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1706
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18 endc
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19
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20 psect view_vef_a,0,0,0,0,0
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21
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22 vsect dp
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23 linesize rmb 2
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24 endofpic rmb 1
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25 VEFtype rmb 1
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26 numpics rmb 1 Total number of pictures to load.
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27 endsect
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28
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29 SetVF:
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30 tst <format
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31 bne SetVF1
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32 sta numpics Set total number of pictures.
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33 lda #VEFFormat
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34 sta <format
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35 SetVF1
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36 rts
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37
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38 VEFshowpic:
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39 clra
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40 VEFshow1
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41 bsr showvef
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42 inca
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43 cmpa numpics
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44 bne VEFshow1
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45
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46 * Now, were we displaying multiple pix??
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47 lda numpics
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48 cmpa #1
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49 beq onepic
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50 lda <cyclestart Disable cycling
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51 sta <cycleend
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52 lda #$ff
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53 sta <flipping Enable flipping.
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54 ldd #2
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55 std <fliprate
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56 onepic
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57 rts
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58
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59 showvef
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60 pshs a,b,x,y,u
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61 bsr header Get header info
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62 lbsr setscreen Set up screen
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63 lbsr setpals Set up palettes
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64
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65 lbsr setbuffer Set up Get/Put Buffer
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66 std linesize Store size of line in bytes.
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67 lda VEFtype
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68 cmpa #2
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69 bne showvef00
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70 ldd linesize Screen type 2 is simulated, so halve the linesize value
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71 lsra
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72 rorb
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73 std linesize
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74 showvef00
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75
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76 ldd <Skiplines Skip lines at top.
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77 beq skip01
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78 skip00
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79 lbsr getline
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80 subd #1
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81 bne skip00
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82 skip01
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83
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84 ldd #00 Now display 192 lines
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85 showpicloop
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86 lbsr getline
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87 lbsr putline
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88 addd #1
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89 cmpd #192
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90 bne showpicloop
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91
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92 showpicclear
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93 lbsr getline Now read until end of picture (to prepare for next file).
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94 tst endofpic
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95 beq showpicclear
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96
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97 puls a,b,x,y,u,pc
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98
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99 *
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100 * read header info from file, and set window type information
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101 *
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102 vsect dp
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103 endoffile rmb 1
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104 compression rmb 1 0= Normal, $80=Squashed
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105 count rmb 1 Counts number packets to decode
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106 linesleft rmb 1 Counts down lines in picture.
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107 endsect
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108
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109 header
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110 pshs a,b,x,y,u
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111 clr endofpic
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112 ldb #200
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113 stb linesleft
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114 leax altbuff,y read in type and palettes into altbuff
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115 pshs y
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116 ldy #18
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117 lbsr I_Read
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118 lbcs _error
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119 puls y
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120 leax altbuff,y
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121 lda ,x+ This byte is the compression type: 0=none, $80=squashed.
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122 beq header10
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123 cmpa #$80 Squashed format
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124 lbne E$Format
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125 header10
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126 sta compression
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127 lda ,x+
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128 cmpa #4
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129 lbhi E$Format
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130 sta VEFtype
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131 tst <type
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132 bne headtype
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133 leau headtable,pcr
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134 lda a,u
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135 sta <type
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136 headtype
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137 leau palette,y
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138 ldb #16
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139 headloop
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140 lda ,x+
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141 sta ,u+
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142 decb
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143 bne headloop
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144 bra headmisc
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145 headtable fcb 8,7,8,6,5
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146 headmisc
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147 * Set some miscellaneous variables
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148 lda #8 Set first, last palette for animation
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149 sta <cyclestart
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150 lda #15
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151 sta <cycleend
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152 ldd #5 Default animation delay
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153 std <cyclerate
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154 lda #0 No color rotation
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155 sta <extranum
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156 ldd <Skiplines
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157 cmpd #$ffff Is Skiplines still default?
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158 bne headskip No, don't change it.
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159 ldd #8
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160 std <Skiplines Set it to 8.
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161 headskip
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162 puls a,b,x,y,u,pc
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163
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164 *
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165 * Getline
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166 *
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167 getline
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168 pshs a,b,x,y,u
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169 * First, fill buffers with all zeros
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170 leau linebuff,y
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171 ldb #160
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172 getline3
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173 clr ,u+
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174 decb
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175 bne getline3
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176 * If at end of file, leave it that way
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177 tst endoffile
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178 bne getline1
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179 * If at end of picture, leave it that way
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180 tst endofpic
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181 bne getline1
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182 * Decrement lines left in pic, set endofpic if appropriate
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183 dec linesleft
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184 bne morelines
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185 com endofpic
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186 morelines
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187 * Test compression method
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188 tst compression
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189 bmi squash
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190 * Get an unsquashed line
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191 pshs y
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192 leax linebuff,y read in one line of screen
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193 ldy linesize
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194 lbsr I_Read
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195 puls y
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196 lbcs getline2 Error through EOF check.
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197 bra getline0 Now exit.
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198 * Get a squashed line
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199 squash
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200 leau linebuff,y
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201 ldb #2
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202 stb count
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203 squash1
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204 lbsr I_GetByte
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205 bcs getline2
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206 tfr a,b
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207 clra
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208 leax altbuff,y Use AltBuff to store data to unsquash
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209 pshs y
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210 tfr d,y
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211 lbsr I_Read
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212 puls y
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213 lbcs getline2
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214 ldd linesize
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215 lsra
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216 rorb Always decode half a line at a time.
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217 bsr unsquash
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218 dec count
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219 bne squash1
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220 bra getline0
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221 * Handle read error
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222 getline2
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223 cmpb #E$EOF
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224 bne getline4
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225 com endoffile
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226 bra getline1
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227 * Finished reading line
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228 getline0
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229 lda VEFtype
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230 cmpa #2
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231 bne getline1
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232 bsr expand
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233 bra getline1
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234 * Handle bad errors
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235 getline4
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236 lbra _error If not EOF, just exit with error.
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237 * Exit getline
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238 getline1
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239 puls a,b,x,y,u,pc
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240
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241 *
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242 * Expand a 160 pixel 16-color line to a 320 pixel 16-color line
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243 *
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244 expand
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245 pshs a,b,x,y,u
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246 leax linebuff,y
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247 leay exptable,pcr
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248 ldd linesize (Actually fits in just B)
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249 leax d,x X points to end of 160 pixel line
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250 leau d,x U points to end of 320 pixel line
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251 exploop
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252 lda ,-x
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253 anda #$0f
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254 lda a,y
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255 sta ,-u
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256 lda ,x
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257 lsra
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258 lsra
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259 lsra
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260 lsra
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261 lda a,y
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262 sta ,-u
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263 decb
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264 bne exploop
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265 puls a,b,x,y,u,pc
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266
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267 exptable fcb $00,$11,$22,$33,$44,$55,$66,$77,$88,$99,$AA,$BB,$CC,$DD,$EE,$FF
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268
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269 *
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270 * X points to data to unsquash, U points to destination buffer
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271 * unsquashed result will be exactly B bytes.
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272 * Exit: U points to end of unsquashed, all else unchanged.
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273 *
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274 vsect dp
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275 unsq_count rmb 1
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276 endsect
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277
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278 unsquash
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279 pshs a,b,x
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280 stb unsq_count
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281 unsq_loop
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282 ldb ,x+
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283 beq unsq_end
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284 bpl gl_straight
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285 lda ,x+
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286 * Deal with repeated byte
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287 gl_comp
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288 andb #$7f Strip off high bit
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289 gl_comp2
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290 sta ,u+ Store a copy of this byte
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291 dec unsq_count
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292 beq unsq_end
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293 decb decrement repeat count
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294 bne gl_comp2 Not done, loop
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295 bra unsq_loop Done, get another control value from file.
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296 * Deal with straight section
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297 gl_straight
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298 lda ,x+
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299 sta ,u+ store it
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300 dec unsq_count
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301 beq unsq_end
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302 decb count down bytes left
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303 bne gl_straight
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304 bra unsq_loop If done, get next section
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305 unsq_end
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306 puls a,b,x,pc
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307
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308 endsect
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