12 #include "../stdafx.h"
14 #include "../core/math_func.hpp"
16 #include "../safeguards.h"
18 void Blitter::DrawLine(
void *video,
int x,
int y,
int x2,
int y2,
int screen_width,
int screen_height, uint8 colour,
int width,
int dash)
41 if (dx == 0 && dy == 0) {
43 if (x >= 0 && x < screen_width && y >= 0 && y < screen_height) this->
SetPixel(video, x, y, colour);
47 int frac_diff = width *
max(dx, dy);
52 int frac_sq = width * width * (dx * dx + dy * dy);
53 int frac_max = 3 * frac_diff / 2;
54 while (frac_diff < frac_max) {
55 int frac_test = (frac_diff + frac_max) / 2;
56 if (frac_test * frac_test < frac_sq) {
57 frac_diff = frac_test + 1;
59 frac_max = frac_test - 1;
65 if (dash == 0) dash = 1;
70 int frac_low = dy - frac_diff / 2;
71 int frac_high = dy + frac_diff / 2;
73 while (frac_low + dx / 2 < 0) {
77 while (frac_high - dx / 2 >= 0) {
84 if (dash_count < dash && x >= 0 && x < screen_width) {
85 for (
int y = y_low; y != y_high; y += stepy) {
86 if (y >= 0 && y < screen_height) this->
SetPixel(video, x, y, colour);
100 if (++dash_count >= dash + gap) dash_count = 0;
105 int frac_low = dx - frac_diff / 2;
106 int frac_high = dx + frac_diff / 2;
108 while (frac_low + dy / 2 < 0) {
112 while (frac_high - dy / 2 >= 0) {
119 if (dash_count < dash && y >= 0 && y < screen_height) {
120 for (
int x = x_low; x != x_high; x += stepx) {
121 if (x >= 0 && x < screen_width) this->
SetPixel(video, x, y, colour);
128 if (frac_high >= 0) {
135 if (++dash_count >= dash + gap) dash_count = 0;