8bpp_base.cpp

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00001 /* $Id$ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * 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.
00006  * 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.
00007  * 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/>.
00008  */
00009 
00012 #include "../stdafx.h"
00013 #include "../gfx_func.h"
00014 #include "8bpp_base.hpp"
00015 
00016 void Blitter_8bppBase::DrawColourMappingRect(void *dst, int width, int height, PaletteID pal)
00017 {
00018   const uint8 *ctab = GetNonSprite(pal, ST_RECOLOUR) + 1;
00019 
00020   do {
00021     for (int i = 0; i != width; i++) *((uint8 *)dst + i) = ctab[((uint8 *)dst)[i]];
00022     dst = (uint8 *)dst + _screen.pitch;
00023   } while (--height);
00024 }
00025 
00026 void *Blitter_8bppBase::MoveTo(void *video, int x, int y)
00027 {
00028   return (uint8 *)video + x + y * _screen.pitch;
00029 }
00030 
00031 void Blitter_8bppBase::SetPixel(void *video, int x, int y, uint8 colour)
00032 {
00033   *((uint8 *)video + x + y * _screen.pitch) = colour;
00034 }
00035 
00036 void Blitter_8bppBase::DrawRect(void *video, int width, int height, uint8 colour)
00037 {
00038   do {
00039     memset(video, colour, width);
00040     video = (uint8 *)video + _screen.pitch;
00041   } while (--height);
00042 }
00043 
00044 void Blitter_8bppBase::CopyFromBuffer(void *video, const void *src, int width, int height)
00045 {
00046   uint8 *dst = (uint8 *)video;
00047   const uint8 *usrc = (const uint8 *)src;
00048 
00049   for (; height > 0; height--) {
00050     memcpy(dst, usrc, width * sizeof(uint8));
00051     usrc += width;
00052     dst += _screen.pitch;
00053   }
00054 }
00055 
00056 void Blitter_8bppBase::CopyToBuffer(const void *video, void *dst, int width, int height)
00057 {
00058   uint8 *udst = (uint8 *)dst;
00059   const uint8 *src = (const uint8 *)video;
00060 
00061   for (; height > 0; height--) {
00062     memcpy(udst, src, width * sizeof(uint8));
00063     src += _screen.pitch;
00064     udst += width;
00065   }
00066 }
00067 
00068 void Blitter_8bppBase::CopyImageToBuffer(const void *video, void *dst, int width, int height, int dst_pitch)
00069 {
00070   uint8 *udst = (uint8 *)dst;
00071   const uint8 *src = (const uint8 *)video;
00072 
00073   for (; height > 0; height--) {
00074     memcpy(udst, src, width * sizeof(uint8));
00075     src += _screen.pitch;
00076     udst += dst_pitch;
00077   }
00078 }
00079 
00080 void Blitter_8bppBase::ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y)
00081 {
00082   const uint8 *src;
00083   uint8 *dst;
00084 
00085   if (scroll_y > 0) {
00086     /* Calculate pointers */
00087     dst = (uint8 *)video + left + (top + height - 1) * _screen.pitch;
00088     src = dst - scroll_y * _screen.pitch;
00089 
00090     /* Decrease height and increase top */
00091     top += scroll_y;
00092     height -= scroll_y;
00093     assert(height > 0);
00094 
00095     /* Adjust left & width */
00096     if (scroll_x >= 0) {
00097       dst += scroll_x;
00098       left += scroll_x;
00099       width -= scroll_x;
00100     } else {
00101       src -= scroll_x;
00102       width += scroll_x;
00103     }
00104 
00105     for (int h = height; h > 0; h--) {
00106       memcpy(dst, src, width * sizeof(uint8));
00107       src -= _screen.pitch;
00108       dst -= _screen.pitch;
00109     }
00110   } else {
00111     /* Calculate pointers */
00112     dst = (uint8 *)video + left + top * _screen.pitch;
00113     src = dst - scroll_y * _screen.pitch;
00114 
00115     /* Decrease height. (scroll_y is <=0). */
00116     height += scroll_y;
00117     assert(height > 0);
00118 
00119     /* Adjust left & width */
00120     if (scroll_x >= 0) {
00121       dst += scroll_x;
00122       left += scroll_x;
00123       width -= scroll_x;
00124     } else {
00125       src -= scroll_x;
00126       width += scroll_x;
00127     }
00128 
00129     /* the y-displacement may be 0 therefore we have to use memmove,
00130      * because source and destination may overlap */
00131     for (int h = height; h > 0; h--) {
00132       memmove(dst, src, width * sizeof(uint8));
00133       src += _screen.pitch;
00134       dst += _screen.pitch;
00135     }
00136   }
00137 }
00138 
00139 int Blitter_8bppBase::BufferSize(int width, int height)
00140 {
00141   return width * height;
00142 }
00143 
00144 void Blitter_8bppBase::PaletteAnimate(const Palette &palette)
00145 {
00146   /* Video backend takes care of the palette animation */
00147 }
00148 
00149 Blitter::PaletteAnimation Blitter_8bppBase::UsePaletteAnimation()
00150 {
00151   return Blitter::PALETTE_ANIMATION_VIDEO_BACKEND;
00152 }