mirror of https://github.com/OpenTTD/OpenTTD.git
81 lines
2.6 KiB
C++
81 lines
2.6 KiB
C++
/*
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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 8bpp_simple.cpp Implementation of the simple 8 bpp blitter. */
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#include "../stdafx.h"
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#include "../zoom_func.h"
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#include "8bpp_simple.hpp"
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#include "../safeguards.h"
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/** Instantiation of the simple 8bpp blitter factory. */
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static FBlitter_8bppSimple iFBlitter_8bppSimple;
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void Blitter_8bppSimple::Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom)
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{
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const uint8_t *src, *src_line;
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uint8_t *dst, *dst_line;
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/* Find where to start reading in the source sprite */
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src_line = (const uint8_t *)bp->sprite + (bp->skip_top * bp->sprite_width + bp->skip_left) * ScaleByZoom(1, zoom);
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dst_line = (uint8_t *)bp->dst + bp->top * bp->pitch + bp->left;
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for (int y = 0; y < bp->height; y++) {
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dst = dst_line;
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dst_line += bp->pitch;
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src = src_line;
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src_line += bp->sprite_width * ScaleByZoom(1, zoom);
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for (int x = 0; x < bp->width; x++) {
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uint colour = 0;
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switch (mode) {
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case BM_COLOUR_REMAP:
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case BM_CRASH_REMAP:
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colour = bp->remap[*src];
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break;
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case BM_TRANSPARENT:
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case BM_TRANSPARENT_REMAP:
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if (*src != 0) colour = bp->remap[*dst];
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break;
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case BM_BLACK_REMAP:
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if (*src != 0) *dst = 0;
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break;
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default:
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colour = *src;
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break;
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}
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if (colour != 0) *dst = colour;
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dst++;
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src += ScaleByZoom(1, zoom);
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}
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}
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}
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Sprite *Blitter_8bppSimple::Encode(const SpriteLoader::SpriteCollection &sprite, AllocatorProc *allocator)
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{
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Sprite *dest_sprite;
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dest_sprite = static_cast<Sprite *>(allocator(sizeof(*dest_sprite) + static_cast<size_t>(sprite[ZOOM_LVL_MIN].height) * static_cast<size_t>(sprite[ZOOM_LVL_MIN].width)));
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dest_sprite->height = sprite[ZOOM_LVL_MIN].height;
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dest_sprite->width = sprite[ZOOM_LVL_MIN].width;
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dest_sprite->x_offs = sprite[ZOOM_LVL_MIN].x_offs;
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dest_sprite->y_offs = sprite[ZOOM_LVL_MIN].y_offs;
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/* Copy over only the 'remap' channel, as that is what we care about in 8bpp */
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for (int i = 0; i < sprite[ZOOM_LVL_MIN].height * sprite[ZOOM_LVL_MIN].width; i++) {
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dest_sprite->data[i] = sprite[ZOOM_LVL_MIN].data[i].m;
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}
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return dest_sprite;
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}
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