1 /* $Id$ */

     2 

     3 /** @file macros.h */

     4 

     5 #ifndef MACROS_H

     6 #define MACROS_H

     7 

     8 #include "core/bitmath_func.hpp"

     9 #include "core/math_func.hpp"

    10 

    11 #define GENERAL_SPRITE_COLOR(color) ((color) + PALETTE_RECOLOR_START)

    12 #define PLAYER_SPRITE_COLOR(owner) (GENERAL_SPRITE_COLOR(_player_colors[owner]))

    13 

    14 /**

    15  * Whether a sprite comes from the original graphics files or a new grf file

    16  * (either supplied by OpenTTD or supplied by the user).

    17  *

    18  * @param sprite The sprite to check

    19  * @return True if it is a new sprite, or false if it is original.

    20  */

    21 #define IS_CUSTOM_SPRITE(sprite) ((sprite) >= SPR_SIGNALS_BASE)

    22 

    23 /**

    24  * Do an operation for each set set bit in a value.

    25  *

    26  * This macros is used to do an operation for each set

    27  * bit in a variable. The first variable can be reused

    28  * in the operation due to it's the bit position counter.

    29  * The second variable will be cleared during the usage

    30  *

    31  * @param i The position counter

    32  * @param b The value which we check for set bits

    33  */

    34 #define FOR_EACH_SET_BIT(i, b)            \

    35 	for (i = 0; b != 0; i++, b >>= 1) \

    36 		if (b & 1)

    37 

    38 

    39 static inline uint16 ReadLE16Aligned(const void* x)

    40 {

    41 	return FROM_LE16(*(const uint16*)x);

    42 }

    43 

    44 static inline uint16 ReadLE16Unaligned(const void* x)

    45 {

    46 #ifdef OTTD_ALIGNMENT

    47 	return ((const byte*)x)[0] | ((const byte*)x)[1] << 8;

    48 #else

    49 	return FROM_LE16(*(const uint16*)x);

    50 #endif

    51 }

    52 

    53 

    54 /** return the largest value that can be entered in a variable.

    55  */

    56 #define MAX_UVALUE(type) ((type)~(type)0)

    57 

    58 #endif /* MACROS_H */