/* $Id$ */ /* * 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 8bpp_base.cpp Implementation of the base for all 8 bpp blitters. */ #include "../stdafx.h" #include "../gfx_func.h" #include "8bpp_base.hpp" void Blitter_8bppBase::DrawColourMappingRect(void *dst, int width, int height, int pal) { const uint8 *ctab = GetNonSprite(pal, ST_RECOLOUR) + 1; do { for (int i = 0; i != width; i++) *((uint8 *)dst + i) = ctab[((uint8 *)dst)[i]]; dst = (uint8 *)dst + _screen.pitch; } while (--height); } void *Blitter_8bppBase::MoveTo(const void *video, int x, int y) { return (uint8 *)video + x + y * _screen.pitch; } void Blitter_8bppBase::SetPixel(void *video, int x, int y, uint8 colour) { *((uint8 *)video + x + y * _screen.pitch) = colour; } void Blitter_8bppBase::SetPixelIfEmpty(void *video, int x, int y, uint8 colour) { uint8 *dst = (uint8 *)video + x + y * _screen.pitch; if (*dst == 0) *dst = colour; } void Blitter_8bppBase::DrawRect(void *video, int width, int height, uint8 colour) { do { memset(video, colour, width); video = (uint8 *)video + _screen.pitch; } while (--height); } void Blitter_8bppBase::DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 colour) { int dy; int dx; int stepx; int stepy; int frac; 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 (x >= 0 && y >= 0 && x < screen_width && y < screen_height) this->SetPixel(video, x, y, colour); if (dx > dy) { frac = dy - (dx / 2); while (x != x2) { if (frac >= 0) { y += stepy; frac -= dx; } x += stepx; frac += dy; if (x >= 0 && y >= 0 && x < screen_width && y < screen_height) this->SetPixel(video, x, y, colour); } } else { frac = dx - (dy / 2); while (y != y2) { if (frac >= 0) { x += stepx; frac -= dy; } y += stepy; frac += dx; if (x >= 0 && y >= 0 && x < screen_width && y < screen_height) this->SetPixel(video, x, y, colour); } } } void Blitter_8bppBase::CopyFromBuffer(void *video, const void *src, int width, int height) { uint8 *dst = (uint8 *)video; uint8 *usrc = (uint8 *)src; for (; height > 0; height--) { memcpy(dst, usrc, width * sizeof(uint8)); usrc += width; dst += _screen.pitch; } } void Blitter_8bppBase::CopyToBuffer(const void *video, void *dst, int width, int height) { uint8 *udst = (uint8 *)dst; uint8 *src = (uint8 *)video; for (; height > 0; height--) { memcpy(udst, src, width * sizeof(uint8)); src += _screen.pitch; udst += width; } } void Blitter_8bppBase::CopyImageToBuffer(const void *video, void *dst, int width, int height, int dst_pitch) { uint8 *udst = (uint8 *)dst; uint8 *src = (uint8 *)video; for (; height > 0; height--) { memcpy(udst, src, width * sizeof(uint8)); src += _screen.pitch; udst += dst_pitch; } } void Blitter_8bppBase::ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y) { const uint8 *src; uint8 *dst; if (scroll_y > 0) { /* Calculate pointers */ dst = (uint8 *)video + left + (top + height - 1) * _screen.pitch; src = dst - scroll_y * _screen.pitch; /* Decrease height and increase top */ top += scroll_y; height -= scroll_y; assert(height > 0); /* Adjust left & width */ if (scroll_x >= 0) { dst += scroll_x; left += scroll_x; width -= scroll_x; } else { src -= scroll_x; width += scroll_x; } for (int h = height; h > 0; h--) { memcpy(dst, src, width * sizeof(uint8)); src -= _screen.pitch; dst -= _screen.pitch; } } else { /* Calculate pointers */ dst = (uint8 *)video + left + top * _screen.pitch; src = dst - scroll_y * _screen.pitch; /* Decrese height. (scroll_y is <=0). */ height += scroll_y; assert(height > 0); /* Adjust left & width */ if (scroll_x >= 0) { dst += scroll_x; left += scroll_x; width -= scroll_x; } else { src -= scroll_x; width += scroll_x; } /* the y-displacement may be 0 therefore we have to use memmove, * because source and destination may overlap */ for (int h = height; h > 0; h--) { memmove(dst, src, width * sizeof(uint8)); src += _screen.pitch; dst += _screen.pitch; } } } int Blitter_8bppBase::BufferSize(int width, int height) { return width * height; } void Blitter_8bppBase::PaletteAnimate(uint start, uint count) { /* Video backend takes care of the palette animation */ } Blitter::PaletteAnimation Blitter_8bppBase::UsePaletteAnimation() { return Blitter::PALETTE_ANIMATION_VIDEO_BACKEND; }