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#ifndef __cplusplus
#error NOTE: This file MUST be compiled as C++. In Visual C++, use the /Tp command line option.
#endif
extern "C" {
#include <gfx_system.h>
#include <gfx_tools.h>
};
#define LINEMACRO_1(startx, starty, deltalinear, deltanonlinear, linearvar, nonlinearvar, \
linearend, nonlinearstart, linearmod, nonlinearmod) \
x = (startx); y = (starty); \
incrNE = ((deltalinear) > 0)? (deltalinear) : -(deltalinear); \
incrNE <<= 1; \
deltanonlinear <<= 1; \
incrE = ((deltanonlinear) > 0) ? -(deltanonlinear) : (deltanonlinear); \
d = nonlinearstart-1; \
while (linearvar != (linearend)) { \
buffer[linewidth * y + x] = color; \
linearvar += linearmod; \
if ((d+=incrE) < 0) { \
d += incrNE; \
nonlinearvar += nonlinearmod; \
}; \
}; \
buffer[linewidth * y + x] = color;
#define LINEMACRO_N(startx, starty, deltalinear, deltanonlinear, linearvar, nonlinearvar, \
linearend, nonlinearstart, linearmod, nonlinearmod) \
x = (startx); y = (starty); \
incrNE = ((deltalinear) > 0)? (deltalinear) : -(deltalinear); \
incrNE <<= 1; \
deltanonlinear <<= 1; \
incrE = ((deltanonlinear) > 0) ? -(deltanonlinear) : (deltanonlinear); \
d = nonlinearstart-1; \
while (linearvar != (linearend)) { \
memcpy(&buffer[linewidth * y + bpp*x],&color,bpp); \
linearvar += linearmod; \
if ((d+=incrE) < 0) { \
d += incrNE; \
nonlinearvar += nonlinearmod; \
}; \
}; \
memcpy(&buffer[linewidth * y + x],&color,bpp);
void _dd_draw_line_buffer_1(byte *buffer, int linewidth, rect_t line, int color)
{
/*void dither_line(picture_t buffers, int curx, int cury, short x1, short y1,
int col1, int col2, int priority, int special, char drawenable)*/
int dx, dy, incrE, incrNE, d, finalx, finaly;
int x = line.x;
int y = line.y;
dx = line.xl;
dy = line.yl;
finalx = x + dx;
finaly = y + dy;
dx = abs(dx);
dy = abs(dy);
if (dx > dy) {
if (finalx < x) {
if (finaly < y) { /* llu == left-left-up */
LINEMACRO_1(x, y, dx, dy, x, y, finalx, dx, -1, -1);
} else { /* lld */
LINEMACRO_1(x, y, dx, dy, x, y, finalx, dx, -1, 1);
}
} else { /* x1 >= x */
if (finaly < y) { /* rru */
LINEMACRO_1(x, y, dx, dy, x, y, finalx, dx, 1, -1);
} else { /* rrd */
LINEMACRO_1(x, y, dx, dy, x, y, finalx, dx, 1, 1);
}
}
} else { /* dx <= dy */
if (finaly < y) {
if (finalx < x) { /* luu */
LINEMACRO_1(x, y, dy, dx, y, x, finaly, dy, -1, -1);
} else { /* ruu */
LINEMACRO_1(x, y, dy, dx, y, x, finaly, dy, -1, 1);
}
} else { /* y1 >= y */
if (finalx < x) { /* ldd */
LINEMACRO_1(x, y, dy, dx, y, x, finaly, dy, 1, -1);
} else { /* rdd */
LINEMACRO_1(x, y, dy, dx, y, x, finaly, dy, 1, 1);
}
}
}
}
void _dd_draw_line_buffer_n(int bpp,byte *buffer, int linewidth, rect_t line, byte * color)
{
/*void dither_line(picture_t buffers, int curx, int cury, short x1, short y1,
int col1, int col2, int priority, int special, char drawenable)*/
int dx, dy, incrE, incrNE, d, finalx, finaly;
int x = line.x;
int y = line.y;
dx = line.xl;
dy = line.yl;
finalx = x + dx;
finaly = y + dy;
dx = abs(dx);
dy = abs(dy);
if (dx > dy) {
if (finalx < x) {
if (finaly < y) { /* llu == left-left-up */
LINEMACRO_N(x, y, dx, dy, x, y, finalx, dx, -1, -1);
} else { /* lld */
LINEMACRO_N(x, y, dx, dy, x, y, finalx, dx, -1, 1);
}
} else { /* x1 >= x */
if (finaly < y) { /* rru */
LINEMACRO_N(x, y, dx, dy, x, y, finalx, dx, 1, -1);
} else { /* rrd */
LINEMACRO_N(x, y, dx, dy, x, y, finalx, dx, 1, 1);
}
}
} else { /* dx <= dy */
if (finaly < y) {
if (finalx < x) { /* luu */
LINEMACRO_N(x, y, dy, dx, y, x, finaly, dy, -1, -1);
} else { /* ruu */
LINEMACRO_N(x, y, dy, dx, y, x, finaly, dy, -1, 1);
}
} else { /* y1 >= y */
if (finalx < x) { /* ldd */
LINEMACRO_N(x, y, dy, dx, y, x, finaly, dy, 1, -1);
} else { /* rdd */
LINEMACRO_N(x, y, dy, dx, y, x, finaly, dy, 1, 1);
}
}
}
}
void _dd_draw_line(gfx_mode_t * mode, rect_t line, byte * dest, int linewidth,gfx_color_t color)
{
byte ca[4];
unsigned short co1;
switch(mode->bytespp)
{
case 1:
_dd_draw_line_buffer_1(dest,linewidth,line,color.visual.global_index);
break;
case 2:
co1 = (color.visual.r << mode->red_shift) & mode->red_mask;
co1 |= (color.visual.g << mode->green_shift) & mode->green_mask;
co1 |= (color.visual.b << mode->blue_shift) & mode->blue_mask;
_dd_draw_line_buffer_n(2,dest,linewidth,line, (byte *) &co1);
break;
case 3:
ca[mode->red_shift/8]=color.visual.r;
ca[mode->green_shift/8]=color.visual.g;
ca[mode->blue_shift/8]=color.visual.b;
_dd_draw_line_buffer_n(3,dest,linewidth,line, ca);
break;
}
}
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