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author | Max Horn | 2005-04-27 20:29:19 +0000 |
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committer | Max Horn | 2005-04-27 20:29:19 +0000 |
commit | 4ec716103270459a978fe1e6c699db5bfd5ae6cc (patch) | |
tree | 1cce871512dd281dfa90c8b160b9e5bf5a60d8a1 | |
parent | 6fb944befd6e7bc089d4e7cc309ee1f6e8d89dc7 (diff) | |
download | scummvm-rg350-4ec716103270459a978fe1e6c699db5bfd5ae6cc.tar.gz scummvm-rg350-4ec716103270459a978fe1e6c699db5bfd5ae6cc.tar.bz2 scummvm-rg350-4ec716103270459a978fe1e6c699db5bfd5ae6cc.zip |
Patch #1186744 (Common line-drawing function)
svn-id: r17842
-rw-r--r-- | graphics/primitives.cpp | 64 | ||||
-rw-r--r-- | graphics/primitives.h | 30 | ||||
-rw-r--r-- | sword2/build_display.h | 1 | ||||
-rw-r--r-- | sword2/driver/render.cpp | 45 |
4 files changed, 97 insertions, 43 deletions
diff --git a/graphics/primitives.cpp b/graphics/primitives.cpp new file mode 100644 index 0000000000..f5c28a0cfd --- /dev/null +++ b/graphics/primitives.cpp @@ -0,0 +1,64 @@ +/* ScummVM - Scumm Interpreter + * Copyright (C) 2002-2005 The ScummVM project + * + * This program 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; either version 2 + * of the License, or (at your option) any later version. + * + * This program 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 this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * $Header$ + */ + +#include "common/stdafx.h" +#include "common/util.h" + +namespace Graphics { + +void drawLine(int x0, int y0, int x1, int y1, int color, void (*plotProc)(int, int, int, void *), void *data) { + // Bresenham's line algorithm, as described by Wikipedia + bool steep = ABS(y1 - y0) > ABS(x1 - x0); + + if (steep) { + SWAP(x0, y0); + SWAP(x1, y1); + } + + int delta_x = ABS(x1 - x0); + int delta_y = ABS(y1 - y0); + int err = 0; + int delta_err = delta_y; + int x = x0; + int y = y0; + + int x_step = (x0 < x1) ? 1 : -1; + int y_step = (y0 < y1) ? 1 : -1; + + if (steep) + (*plotProc)(y, x, color, data); + else + (*plotProc)(x, y, color, data); + + while (x != x1) { + x += x_step; + err += delta_err; + if (2 * err > delta_x) { + y += y_step; + err -= delta_x; + } + if (steep) + (*plotProc)(y, x, color, data); + else + (*plotProc)(x, y, color, data); + } +} + +} // End of namespace Graphics diff --git a/graphics/primitives.h b/graphics/primitives.h new file mode 100644 index 0000000000..d00c68840e --- /dev/null +++ b/graphics/primitives.h @@ -0,0 +1,30 @@ +/* ScummVM - Scumm Interpreter + * Copyright (C) 2002-2005 The ScummVM project + * + * This program 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; either version 2 + * of the License, or (at your option) any later version. + * + * This program 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 this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * $Header$ + */ + +#ifndef GRAPHICS_PRIMITIVES_H +#define GRAPHICS_PRIMITIVES_H + +namespace Graphics { + +extern void drawLine(int x0, int y0, int x1, int y1, int color, void (*plotProc)(int, int, int, void *), void *data); + +} // End of namespace Graphics + +#endif diff --git a/sword2/build_display.h b/sword2/build_display.h index 11b25e6694..76853bcf7e 100644 --- a/sword2/build_display.h +++ b/sword2/build_display.h @@ -417,7 +417,6 @@ public: void plotPoint(int x, int y, uint8 colour); void drawLine(int x0, int y0, int x1, int y1, uint8 colour); - void drawLine(int x0, int y0, int x1, int y1, int color, void (*plotProc)(int, int, int, void *), void *data); #ifdef BACKEND_8BIT void plotYUV(byte *lut, int width, int height, byte *const *dat); diff --git a/sword2/driver/render.cpp b/sword2/driver/render.cpp index 0cb20b0291..f2030a295f 100644 --- a/sword2/driver/render.cpp +++ b/sword2/driver/render.cpp @@ -21,6 +21,8 @@ #include "common/stdafx.h" #include "common/system.h" +#include "graphics/primitives.h" + #include "sword2/sword2.h" #include "sword2/defs.h" #include "sword2/build_display.h" @@ -225,48 +227,7 @@ static void plot(int x, int y, int colour, void *data) { */ void Screen::drawLine(int x0, int y0, int x1, int y1, uint8 colour) { - drawLine(x0, y0, x1, y1, colour, &plot, this); -} - -// TODO: Main line-drawing function. Move this somewhere where other engines -// can benefit from it. - -void Screen::drawLine(int x0, int y0, int x1, int y1, int color, void (*plotProc)(int, int, int, void *), void *data) { - // Bresenham's line algorithm, as described by Wikipedia - bool steep = ABS(y1 - y0) > ABS(x1 - x0); - - if (steep) { - SWAP(x0, y0); - SWAP(x1, y1); - } - - int delta_x = ABS(x1 - x0); - int delta_y = ABS(y1 - y0); - int err = 0; - int delta_err = delta_y; - int x = x0; - int y = y0; - - int x_step = (x0 < x1) ? 1 : -1; - int y_step = (y0 < y1) ? 1 : -1; - - if (steep) - (*plotProc)(y, x, color, data); - else - (*plotProc)(x, y, color, data); - - while (x != x1) { - x += x_step; - err += delta_err; - if (2 * err > delta_x) { - y += y_step; - err -= delta_x; - } - if (steep) - (*plotProc)(y, x, color, data); - else - (*plotProc)(x, y, color, data); - } + Graphics::drawLine(x0, y0, x1, y1, colour, &plot, this); } /** |