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Location: cpp/openttd-patchpack/source/src/blitter/common.hpp - annotation
r25257:56e3bc921253
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Change: track hover position on Online Players GUI
Especially if there are many players online, trying to chat with
the right one can be a visual challenge. This can be solved by
highlighting the row you are on. This visual cue is often enough
for humans to find the right row.
Especially if there are many players online, trying to chat with
the right one can be a visual challenge. This can be solved by
highlighting the row you are on. This visual cue is often enough
for humans to find the right row.
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* This file is part of OpenTTD.
* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file common.hpp Common functionality for all blitter implementations. */
#ifndef BLITTER_COMMON_HPP
#define BLITTER_COMMON_HPP
#include "base.hpp"
#include "../core/math_func.hpp"
#include <utility>
template <typename SetPixelT>
void Blitter::DrawLineGeneric(int x, int y, int x2, int y2, int screen_width, int screen_height, int width, int dash, SetPixelT set_pixel)
{
int dy;
int dx;
int stepx;
int stepy;
dy = (y2 - y) * 2;
if (dy < 0) {
dy = -dy;
stepy = -1;
} else {
stepy = 1;
}
dx = (x2 - x) * 2;
if (dx < 0) {
dx = -dx;
stepx = -1;
} else {
stepx = 1;
}
if (dx == 0 && dy == 0) {
/* The algorithm below cannot handle this special case; make it work at least for line width 1 */
if (x >= 0 && x < screen_width && y >= 0 && y < screen_height) set_pixel(x, y);
return;
}
int frac_diff = width * std::max(dx, dy);
if (width > 1) {
/* compute frac_diff = width * sqrt(dx*dx + dy*dy)
* Start interval:
* max(dx, dy) <= sqrt(dx*dx + dy*dy) <= sqrt(2) * max(dx, dy) <= 3/2 * max(dx, dy) */
int64 frac_sq = ((int64) width) * ((int64) width) * (((int64) dx) * ((int64) dx) + ((int64) dy) * ((int64) dy));
int frac_max = 3 * frac_diff / 2;
while (frac_diff < frac_max) {
int frac_test = (frac_diff + frac_max) / 2;
if (((int64) frac_test) * ((int64) frac_test) < frac_sq) {
frac_diff = frac_test + 1;
} else {
frac_max = frac_test - 1;
}
}
}
int gap = dash;
if (dash == 0) dash = 1;
int dash_count = 0;
if (dx > dy) {
if (stepx < 0) {
std::swap(x, x2);
std::swap(y, y2);
stepy = -stepy;
}
if (x2 < 0 || x >= screen_width) return;
int y_low = y;
int y_high = y;
int frac_low = dy - frac_diff / 2;
int frac_high = dy + frac_diff / 2;
while (frac_low < -(dx / 2)) {
frac_low += dx;
y_low -= stepy;
}
while (frac_high >= dx / 2) {
frac_high -= dx;
y_high += stepy;
}
if (x < 0) {
dash_count = (-x) % (dash + gap);
auto adjust_frac = [&](int64 frac, int &y_bound) -> int {
frac -= ((int64) dy) * ((int64) x);
if (frac >= 0) {
int quotient = frac / dx;
int remainder = frac % dx;
y_bound += (1 + quotient) * stepy;
frac = remainder - dx;
}
return frac;
};
frac_low = adjust_frac(frac_low, y_low);
frac_high = adjust_frac(frac_high, y_high);
x = 0;
}
x2++;
if (x2 > screen_width) {
x2 = screen_width;
}
while (x != x2) {
if (dash_count < dash) {
for (int y = y_low; y != y_high; y += stepy) {
if (y >= 0 && y < screen_height) set_pixel(x, y);
}
}
if (frac_low >= 0) {
y_low += stepy;
frac_low -= dx;
}
if (frac_high >= 0) {
y_high += stepy;
frac_high -= dx;
}
x++;
frac_low += dy;
frac_high += dy;
if (++dash_count >= dash + gap) dash_count = 0;
}
} else {
if (stepy < 0) {
std::swap(x, x2);
std::swap(y, y2);
stepx = -stepx;
}
if (y2 < 0 || y >= screen_height) return;
int x_low = x;
int x_high = x;
int frac_low = dx - frac_diff / 2;
int frac_high = dx + frac_diff / 2;
while (frac_low < -(dy / 2)) {
frac_low += dy;
x_low -= stepx;
}
while (frac_high >= dy / 2) {
frac_high -= dy;
x_high += stepx;
}
if (y < 0) {
dash_count = (-y) % (dash + gap);
auto adjust_frac = [&](int64 frac, int &x_bound) -> int {
frac -= ((int64) dx) * ((int64) y);
if (frac >= 0) {
int quotient = frac / dy;
int remainder = frac % dy;
x_bound += (1 + quotient) * stepx;
frac = remainder - dy;
}
return frac;
};
frac_low = adjust_frac(frac_low, x_low);
frac_high = adjust_frac(frac_high, x_high);
y = 0;
}
y2++;
if (y2 > screen_height) {
y2 = screen_height;
}
while (y != y2) {
if (dash_count < dash) {
for (int x = x_low; x != x_high; x += stepx) {
if (x >= 0 && x < screen_width) set_pixel(x, y);
}
}
if (frac_low >= 0) {
x_low += stepx;
frac_low -= dy;
}
if (frac_high >= 0) {
x_high += stepx;
frac_high -= dy;
}
y++;
frac_low += dx;
frac_high += dx;
if (++dash_count >= dash + gap) dash_count = 0;
}
}
}
#endif /* BLITTER_COMMON_HPP */
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