2 THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
3 SOFTWARE CORPORATION ("PARALLAX"). PARALLAX, IN DISTRIBUTING THE CODE TO
4 END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
5 ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
6 IN USING, DISPLAYING, AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
7 SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
8 FREE PURPOSES. IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
9 CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES. THE END-USER UNDERSTANDS
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.
16 * Graphical routines for drawing solid scanlines.
37 int Gr_scanline_darkening_level = GR_FADE_LEVELS;
39 #if !defined(NO_ASM) && defined(__WATCOMC__)
41 void gr_linear_darken( ubyte * dest, int darkening_level, int count, ubyte * fade_table );
42 #pragma aux gr_linear_darken parm [edi] [eax] [ecx] [edx] modify exact [eax ebx ecx edx edi] = \
45 "gld_loop: mov bl, [edi] " \
46 " mov al, [ebx+edx] " \
52 #elif !defined(NO_ASM) && defined(__GNUC__)
54 static inline void gr_linear_darken( ubyte * dest, int darkening_level, int count, ubyte * fade_table ) {
56 __asm__ __volatile__ (
59 "0: movb (%%edi), %%bl;"
60 " movb (%%ebx, %%edx), %%al;"
61 " movb %%al, (%%edi);"
65 : "=D" (dummy[0]), "=a" (dummy[1]), "=c" (dummy[2]), "=d" (dummy[3])
66 : "0" (dest), "1" (darkening_level), "2" (count), "3" (fade_table)
70 #elif !defined(NO_ASM) && defined(_MSC_VER)
72 __inline void gr_linear_darken( ubyte * dest, int darkening_level, int count, ubyte * fade_table )
76 mov eax,[darkening_level]
91 #else // Unknown compiler, or no assembler. So we use C.
93 void gr_linear_darken(ubyte * dest, int darkening_level, int count, ubyte * fade_table) {
98 *dest = fade_table[(*dest)+(darkening_level*256)];
105 #ifdef NO_ASM // No Assembler. So we use C.
107 void gr_linear_stosd( ubyte * dest, ubyte color, unsigned short count )
112 while ((int)(dest) & 0x3) { *dest++ = color; count--; };
114 x = (color << 24) | (color << 16) | (color << 8) | color;
115 while (count > 4) { *(int *)dest = x; dest += 4; count -= 4; };
117 while (count > 0) { *dest++ = color; count--; };
119 for (i=0; i<count; i++ )
124 void gr_linear_stosd( ubyte * dest, unsigned char color, unsigned int nbytes) {
125 memset(dest,color,nbytes);
130 void gr_uscanline( int x1, int x2, int y )
132 if (Gr_scanline_darkening_level >= GR_FADE_LEVELS ) {
139 gr_linear_stosd( DATA + ROWSIZE*y + x1, (unsigned char)COLOR, x2-x1+1);
143 gr_modex_uscanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
146 gr_vesa_scanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
157 gr_linear_darken( DATA + ROWSIZE*y + x1, Gr_scanline_darkening_level, x2-x1+1, gr_fade_table);
161 gr_modex_uscanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
166 ubyte * vram = (ubyte *)0xA0000;
167 int VideoLocation,page,offset1, offset2;
169 VideoLocation = (ROWSIZE * y) + x1;
170 page = VideoLocation >> 16;
171 offset1 = VideoLocation & 0xFFFF;
172 offset2 = offset1 + (x2-x1+1);
174 gr_vesa_setpage( page );
175 if ( offset2 <= 0xFFFF ) {
176 gr_linear_darken( &vram[offset1], Gr_scanline_darkening_level, x2-x1+1, gr_fade_table);
178 gr_linear_darken( &vram[offset1], Gr_scanline_darkening_level, 0xFFFF-offset1+1, gr_fade_table);
180 gr_vesa_setpage(page);
181 gr_linear_darken( vram, Gr_scanline_darkening_level, offset2 - 0xFFFF, gr_fade_table);
185 gr_vesa_scanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
193 void gr_scanline( int x1, int x2, int y )
195 if ((y<0)||(y>MAXY)) return;
197 if (x2 < x1 ) x2 ^= x1 ^= x2;
199 if (x1 > MAXX) return;
200 if (x2 < MINX) return;
202 if (x1 < MINX) x1 = MINX;
203 if (x2 > MAXX) x2 = MAXX;
205 if (Gr_scanline_darkening_level >= GR_FADE_LEVELS ) {
212 gr_linear_stosd( DATA + ROWSIZE*y + x1, (unsigned char)COLOR, x2-x1+1);
216 gr_modex_uscanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
219 gr_vesa_scanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
230 gr_linear_darken( DATA + ROWSIZE*y + x1, Gr_scanline_darkening_level, x2-x1+1, gr_fade_table);
234 gr_modex_uscanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
239 ubyte * vram = (ubyte *)0xA0000;
240 int VideoLocation,page,offset1, offset2;
242 VideoLocation = (ROWSIZE * y) + x1;
243 page = VideoLocation >> 16;
244 offset1 = VideoLocation & 0xFFFF;
245 offset2 = offset1 + (x2-x1+1);
247 gr_vesa_setpage( page );
248 if ( offset2 <= 0xFFFF ) {
249 gr_linear_darken( &vram[offset1], Gr_scanline_darkening_level, x2-x1+1, gr_fade_table);
251 gr_linear_darken( &vram[offset1], Gr_scanline_darkening_level, 0xFFFF-offset1+1, gr_fade_table);
253 gr_vesa_setpage(page);
254 gr_linear_darken( vram, Gr_scanline_darkening_level, offset2 - 0xFFFF, gr_fade_table);
258 gr_vesa_scanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );