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8 FREE PURPOSES. IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
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10 AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
11 COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
27 int Gr_scanline_darkening_level = GR_FADE_LEVELS;
31 void gr_linear_darken( ubyte * dest, int darkening_level, int count, ubyte * fade_table );
32 # pragma aux gr_linear_darken parm [edi] [eax] [ecx] [edx] modify exact [eax ebx ecx edx edi] = \
35 "gld_loop: mov bl, [edi] " \
36 " mov al, [ebx+edx] " \
42 # elif defined __GNUC__
43 static inline void gr_linear_darken( ubyte * dest, int darkening_level, int count, ubyte * fade_table ) {
45 __asm__ __volatile__ (
48 "0: movb (%%edi), %%bl;"
49 " movb (%%ebx, %%edx), %%al;"
50 " movb %%al, (%%edi);"
54 : "=D" (dummy[0]), "=a" (dummy[1]), "=c" (dummy[2]), "=d" (dummy[3])
55 : "0" (dest), "1" (darkening_level), "2" (count), "3" (fade_table)
58 # elif defined _MSC_VER
59 __inline void gr_linear_darken( ubyte * dest, int darkening_level, int count, ubyte * fade_table )
63 mov eax,[darkening_level]
78 // Unknown compiler. So we use C rather than inline assembler.
79 # define USE_C_GR_LINEAR_DARKEN 1
82 #else // No Assembler. So we use C.
83 # define USE_C_GR_LINEAR_DARKEN 1
84 void gr_linear_stosd( ubyte * dest, unsigned char color, unsigned int nbytes) {
85 memset(dest,color,nbytes);
89 #ifdef USE_C_GR_LINEAR_DARKEN
90 void gr_linear_darken(ubyte * dest, int darkening_level, int count, ubyte * fade_table) {
94 *dest=fade_table[(*dest++)+(darkening_level*256)];
98 void gr_uscanline( int x1, int x2, int y )
100 if (Gr_scanline_darkening_level >= GR_FADE_LEVELS ) {
106 gr_linear_stosd( DATA + ROWSIZE*y + x1, (unsigned char)COLOR, x2-x1+1);
110 gr_modex_uscanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
113 gr_vesa_scanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
123 gr_linear_darken( DATA + ROWSIZE*y + x1, Gr_scanline_darkening_level, x2-x1+1, gr_fade_table);
127 gr_modex_uscanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
130 gr_vesa_scanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
137 void gr_scanline( int x1, int x2, int y )
139 if ((y<0)||(y>MAXY)) return;
141 if (x2 < x1 ) x2 ^= x1 ^= x2;
143 if (x1 > MAXX) return;
144 if (x2 < MINX) return;
146 if (x1 < MINX) x1 = MINX;
147 if (x2 > MAXX) x2 = MAXX;
149 if (Gr_scanline_darkening_level >= GR_FADE_LEVELS ) {
155 gr_linear_stosd( DATA + ROWSIZE*y + x1, (unsigned char)COLOR, x2-x1+1);
159 gr_modex_uscanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
162 gr_vesa_scanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
172 gr_linear_darken( DATA + ROWSIZE*y + x1, Gr_scanline_darkening_level, x2-x1+1, gr_fade_table);
176 gr_modex_uscanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
179 gr_vesa_scanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );