MHVLib  20111011
An efficiency oriented runtime library for AVR microcontrollers
A:/eclipse/mhvlib/MHV_GammaCorrect.h
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00001 /* Copyright (c) 2011, Make, Hack, Void Inc
00002  * All rights reserved.
00003  *
00004  * Redistribution and use in source and binary forms, with or without
00005  * modification, are permitted provided that the following conditions are met:
00006  *  * Redistributions of source code must retain the above copyright
00007  *    notice, this list of conditions and the following disclaimer.
00008  *  * Redistributions in binary form must reproduce the above copyright
00009  *    notice, this list of conditions and the following disclaimer in the
00010  *    documentation and/or other materials provided with the distribution.
00011  *  * Neither the name of the Make, Hack, Void nor the
00012  *    names of its contributors may be used to endorse or promote products
00013  *    derived from this software without specific prior written permission.
00014  *
00015  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
00016  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
00017  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
00018  * DISCLAIMED. IN NO EVENT SHALL MAKE, HACK, VOID BE LIABLE FOR ANY
00019  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
00020  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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00022  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
00023  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00024  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00025  */
00026 
00027 #ifndef MHV_GAMMACORRECT_H_
00028 #define MHV_GAMMACORRECT_H_
00029 
00030 #include <inttypes.h>
00031 #include <math.h>
00032 #include <avr/pgmspace.h>
00033 
00034 /* Requires mhv_gammaValues to be brought in as:
00035  *      extern uint8_t mhv_gammaValues[] PROGMEM;
00036  */
00037 #define MHV_PRECALCULATED_GAMMA_CORRECT(gammaValue) \
00038         pgm_read_byte(mhv_gammaValues + gammaValue)
00039 
00040 uint8_t mhv_calculatedGammaCorrect(uint8_t value);
00041 uint8_t mhv_precalculatedGammaCorrect(uint8_t value);
00042 
00043 #endif /* MHV_GAMMACORRECT_H_ */