(svn r22288) -Codechange: Deduplicate Blitter_8bppBase::DrawLine() and Blitter_32bppBase::DrawLine() into Blitter::DrawLine().
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/* $Id$ */
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/*
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* This file is part of OpenTTD.
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* 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.
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* 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.
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* 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/>.
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*/
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/** @file base.cpp Implementation of the base for all blitters. */
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#include "../stdafx.h"
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#include "base.hpp"
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/**
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* Draw a line with a given colour.
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* @param video The destination pointer (video-buffer).
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* @param x The x coordinate from where the line starts.
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* @param y The y coordinate from where the line starts.
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* @param x2 The x coordinate to where the line goes.
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* @param y2 The y coordinate to where the lines goes.
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* @param screen_width The width of the screen you are drawing in (to avoid buffer-overflows).
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* @param screen_height The height of the screen you are drawing in (to avoid buffer-overflows).
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* @param colour A 8bpp mapping colour.
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*/
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void Blitter::DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 colour)
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{
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int dy;
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int dx;
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int stepx;
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int stepy;
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int frac;
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dy = (y2 - y) * 2;
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if (dy < 0) {
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dy = -dy;
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stepy = -1;
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} else {
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stepy = 1;
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}
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dx = (x2 - x) * 2;
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if (dx < 0) {
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dx = -dx;
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stepx = -1;
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} else {
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stepx = 1;
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}
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if (x >= 0 && y >= 0 && x < screen_width && y < screen_height) this->SetPixel(video, x, y, colour);
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if (dx > dy) {
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frac = dy - (dx / 2);
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while (x != x2) {
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if (frac >= 0) {
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y += stepy;
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frac -= dx;
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}
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x += stepx;
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frac += dy;
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if (x >= 0 && y >= 0 && x < screen_width && y < screen_height) this->SetPixel(video, x, y, colour);
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}
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} else {
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frac = dx - (dy / 2);
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while (y != y2) {
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if (frac >= 0) {
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x += stepx;
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frac -= dy;
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}
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y += stepy;
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frac += dx;
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if (x >= 0 && y >= 0 && x < screen_width && y < screen_height) this->SetPixel(video, x, y, colour);
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}
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}
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}
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