|
102
|
1 ;=============================================================================
|
|
|
2 ;
|
|
|
3 ; File color_processor.asm
|
|
|
4 ;
|
|
|
5 ; Decompress and draw an image.
|
|
|
6 ;
|
|
|
7 ; This program is free software: you can redistribute it and/or modify
|
|
|
8 ; it under the terms of the GNU General Public License as published by
|
|
|
9 ; the Free Software Foundation, either version 3 of the License, or
|
|
|
10 ; (at your option) any later version.
|
|
|
11 ;
|
|
|
12 ; This program is distributed in the hope that it will be useful,
|
|
|
13 ; but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
14 ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
15 ; GNU General Public License for more details.
|
|
|
16 ;
|
|
|
17 ; You should have received a copy of the GNU General Public License
|
|
|
18 ; along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
19 ;
|
|
|
20 ; Copyright (c) 2010, JD Gascuel.
|
|
|
21 ;=============================================================================
|
|
|
22 ; HISTORY
|
|
|
23 ; 2010-12-13 : [jDG] Creation
|
|
|
24 ;
|
|
|
25 ; RATIONALS: The OSTC have a nice color screen, and a std geek attitude impose
|
|
|
26 ; to show off ... ;-)
|
|
|
27 ;
|
|
|
28 ; Inputs: TBLPTR points to the image description block.
|
|
|
29 ; win_top, win_leftx2 the Top/Leftx2 corner here to put the image.
|
|
|
30 ; Ouputs: None.
|
|
|
31 ; Trashed: TBLPTR, TABLAT, FSR2, PROD, aa_width, aa_height
|
|
|
32 ;
|
|
|
33 ; ImageBloc:
|
|
|
34 ; db widthx2, height
|
|
|
35 ; db nbColors, 0
|
|
|
36 ; dw color0, color1, color2, color3, ...
|
|
|
37 ; db ...packed pixels...
|
|
|
38 ;
|
|
|
39 ; Limitations:
|
|
|
40 ; * nbColors should be <= 15.
|
|
|
41 ; * image width should be even.
|
|
|
42 ; * image left border should be on even position too.
|
|
|
43 ;
|
|
|
44 ;Temporary overlay (in bank 0)
|
|
|
45 img_width equ aa_width
|
|
|
46 img_height equ aa_height
|
|
|
47 img_top equ win_top
|
|
|
48 img_left equ win_leftx2
|
|
|
49 img_pixelsL equ aa_start+0
|
|
|
50 img_pixelsH equ aa_start+1
|
|
|
51 img_pixelsU equ aa_end+0
|
|
|
52 img_countL equ aa_end+1
|
|
|
53 img_countH equ aa_colorDiv+0
|
|
|
54 img_colors equ aa_colorDiv+1
|
|
|
55 colorTable equ letter
|
|
|
56
|
|
|
57 ;-----------------------------------------------------------------------------
|
|
|
58 ; Make an entry in the link map.
|
|
|
59 color_processor code
|
|
|
60
|
|
|
61 ;-----------------------------------------------------------------------------
|
|
|
62 color_image:
|
|
|
63 movlb HIGH(img_width)
|
|
|
64
|
|
|
65 ;---- Get image parameters -------------------------------------------
|
|
|
66 tblrd*+
|
|
|
67 movff TABLAT,img_width
|
|
|
68 tblrd*+
|
|
|
69 movff TABLAT,img_height
|
|
|
70 tblrd*+
|
|
|
71 movff TABLAT,img_colors
|
|
|
72 tblrd*+
|
|
|
73 ;---- Copy color table -----------------------------------------------
|
|
|
74 movf img_colors,W
|
|
|
75 lfsr FSR2,colorTable
|
|
|
76 get_colors_loop:
|
|
|
77 tblrd*+
|
|
|
78 movff TABLAT,POSTINC2
|
|
|
79 tblrd*+
|
|
|
80 movff TABLAT,POSTINC2
|
|
|
81 decfsz WREG
|
|
|
82 bra get_colors_loop
|
|
|
83
|
|
|
84 ; Compute width * height * 2 : the number of pixels to write.
|
|
|
85 clrf img_pixelsU
|
|
|
86 movf img_width,W ; Compute number of pixels to draw
|
|
|
87 mulwf img_height ; 0 .. 160x240
|
|
|
88 rlcf PRODL ; x2 --> 0 .. 320x240, might by > 0xFFFF
|
|
|
89 rlcf PRODH
|
|
|
90 movff PRODL, img_pixelsL
|
|
|
91 movff PRODH, img_pixelsH
|
|
|
92 rlcf img_pixelsU ; Get the upper bit in place.
|
|
|
93
|
|
|
94 ;---- Send window command --------------------------------------------
|
|
|
95 clrf img_width+1 ; x2 on width, for the true box size.
|
|
|
96 rlcf img_width+0
|
|
|
97 rlcf img_width+1
|
|
|
98 call aa_box_cmd
|
|
|
99 AA_CMD_WRITE 0x22
|
|
|
100
|
|
|
101 ;---- Decode pixels --------------------------------------------------
|
|
|
102 color_image_loop_xy:
|
|
|
103 ; Get pixel count
|
|
|
104 clrf img_countL
|
|
|
105 clrf img_countH
|
|
|
106
|
|
|
107 color_image_loop_count:
|
|
|
108 tblrd*+ ; Get one byte
|
|
|
109
|
|
|
110 movlw 0x0F ; Get count bits
|
|
|
111 andwf TABLAT,W
|
|
|
112 swapf WREG ; On top-4 bits of W
|
|
|
113 rlcf WREG ; Push topmost bit into img_count:2
|
|
|
114 rlcf img_countL
|
|
|
115 rlcf img_countH
|
|
|
116 rlcf WREG ; Push topmost bit into img_count:2
|
|
|
117 rlcf img_countL
|
|
|
118 rlcf img_countH
|
|
|
119 rlcf WREG ; Push topmost bit into img_count:2
|
|
|
120 rlcf img_countL
|
|
|
121 rlcf img_countH
|
|
|
122 rlcf WREG ; Push topmost bit into img_count:2
|
|
|
123 rlcf img_countL
|
|
|
124 rlcf img_countH
|
|
|
125
|
|
|
126 movf TABLAT,W ; Does the color-bits mark a big-count ?
|
|
|
127 andlw 0xF0
|
|
|
128 xorlw 0xF0
|
|
|
129 bz color_image_loop_count ; YES: loop for more count bits.
|
|
|
130
|
|
|
131 ; Get pixel color into PROD
|
|
|
132 xorlw 0xF0 ; Get back index.
|
|
|
133 swapf WREG ; Get color index to lower bits.
|
|
|
134 addwf WREG ; x2
|
|
|
135 addlw LOW(letter) ; 0x60 + 2 * .15 < 0x80.
|
|
|
136 movff WREG,FSR2L
|
|
|
137 movff POSTINC2,PRODL
|
|
|
138 movff POSTINC2,PRODH
|
|
|
139
|
|
|
140 ; Substract count-1 from the number of pixel we should do.
|
|
|
141 movf img_countL,W ; Make a 24bit substraction.
|
|
|
142 subwf img_pixelsL,F
|
|
|
143 movf img_countH,W
|
|
|
144 subwfb img_pixelsH,F
|
|
|
145 movlw 0
|
|
|
146 subwfb img_pixelsU,F
|
|
|
147
|
|
|
148 incf img_countL ; Get back the true count.
|
|
|
149 addwfc img_countH
|
|
|
150
|
|
|
151 ; Loop sending pixel color
|
|
|
152 incf img_countH ; Because we decrement first, should add one here !
|
|
|
153 color_image_loop_pixel:
|
|
|
154 AA_DATA_WRITE_PROD
|
|
|
155 decfsz img_countL
|
|
|
156 bra color_image_loop_pixel
|
|
|
157 decfsz img_countH
|
|
|
158 bra color_image_loop_pixel
|
|
|
159
|
|
|
160 ; And count (on a 17bit counter)
|
|
|
161 clrf WREG ; Make a 24bit decrement.
|
|
|
162 decf img_pixelsL
|
|
|
163 subwfb img_pixelsH,F
|
|
|
164 subwfb img_pixelsU,F
|
|
|
165
|
|
|
166 movf img_pixelsL,W ; Test if img_pixels == 0
|
|
|
167 iorwf img_pixelsH,W
|
|
|
168 iorwf img_pixelsU,W
|
|
|
169 bnz color_image_loop_xy ; NO: loop...
|
|
|
170
|
|
|
171 ;---- Closeup --------------------------------------------------------
|
|
|
172 AA_CMD_WRITE 0x00
|
|
|
173 return
|
