cpp/openttd-patchpack/source Files · src/cmd_helper.h

Files @ r24860:fb2788d47d86

Branch filter:

Location: cpp/openttd-patchpack/source/src/cmd_helper.h

r24860:fb2788d47d86 1.4 KiB text/x-c Show Annotation Show as Raw Download as Raw

Michael Lutz

Codechange: [OSX] Only keep a total dirty rect for drawing.

When drawing an 8bpp screen buffer, palette resolving was done for each
dirty rectangle. In areas with high activity, this would mean a pixel might
have been resolved multiple times. Also, if too many individual updates
were queued, the whole screen would be refreshed, even if unnecessary.

All other drivers only keep one overall dirty rect, so do it here as well.

/*
 * 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 cmd_helper.h Helper functions to extract data from command parameters. */

#ifndef CMD_HELPER_H
#define CMD_HELPER_H

#include "core/enum_type.hpp"
#include "core/bitmath_func.hpp"

/**
 * Extracts a given type from a value.
 * @tparam T The type of data we're looking for.
 * @tparam S The offset in the data.
 * @tparam N The amount of bits to read.
 * @tparam U The type of data passed to us.
 * @param v The data to extract the value from.
 */
template<typename T, uint S, uint N, typename U> static inline T Extract(U v)
{
	/* Check if there are enough bits in v */
	static_assert(N == EnumPropsT<T>::num_bits);
	static_assert(S + N <= sizeof(U) * 8);
	static_assert(EnumPropsT<T>::end <= (1 << N));
	U masked = GB(v, S, N);
	return IsInsideMM(masked, EnumPropsT<T>::begin, EnumPropsT<T>::end) ? (T)masked : EnumPropsT<T>::invalid;
}

#endif /* CMD_HELPER_H */