cpp/openttd-patchpack/source Files · src/blitter/8bpp_simple.hpp

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Michael Lutz

Codechange: Don't use cpp_offsetof in the save/load code.

Many of the member variables that are used in save/load are inside types
that are not standard layout types. Using pointer arithmetics to determine
addresses of members inside types that are not standard layout is generally
undefined behaviour. If we'd use C++17, it is conditionally supported, which means
each compiler may or may not support it. And even then using it for individual
array elements is syntactically not supported the the standard offsetof function.

Unfortunately, the trickery employed for saving linkgraph settings causes quite some
clutter in the settings ini files.

/*
 * 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_simple.hpp Simple (and slow) 8 bpp blitter. */

#ifndef BLITTER_8BPP_SIMPLE_HPP
#define BLITTER_8BPP_SIMPLE_HPP

#include "8bpp_base.hpp"
#include "factory.hpp"

/** Most trivial 8bpp blitter. */
class Blitter_8bppSimple FINAL : public Blitter_8bppBase {
public:
	void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom) override;
	Sprite *Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator) override;

	const char *GetName() override { return "8bpp-simple"; }
};

/** Factory for the most trivial 8bpp blitter. */
class FBlitter_8bppSimple : public BlitterFactory {
public:
	FBlitter_8bppSimple() : BlitterFactory("8bpp-simple", "8bpp Simple Blitter (relative slow, but never wrong)") {}
	Blitter *CreateInstance() override { return new Blitter_8bppSimple(); }
};

#endif /* BLITTER_8BPP_SIMPLE_HPP */