/******************************************************************************

    palette.h

    Core palette routines.

****************************************************************************

    Copyright Aaron Giles
    All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are
    met:

        * Redistributions of source code must retain the above copyright
          notice, this list of conditions and the following disclaimer.
        * Redistributions in binary form must reproduce the above copyright
          notice, this list of conditions and the following disclaimer in
          the documentation and/or other materials provided with the
          distribution.
        * Neither the name 'MAME' nor the names of its contributors may be
          used to endorse or promote products derived from this software
          without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY AARON GILES ''AS IS'' AND ANY EXPRESS OR
    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    DISCLAIMED. IN NO EVENT SHALL AARON GILES BE LIABLE FOR ANY DIRECT,
    INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
    SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
    STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
    IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    POSSIBILITY OF SUCH DAMAGE.

***************************************************************************/

#pragma once

#ifndef __PALETTE_H__
#define __PALETTE_H__

#include "osdcore.h"


/***************************************************************************
    TYPE DEFINITIONS
***************************************************************************/

/* an rgb_t is a single combined R,G,B (and optionally alpha) value */
typedef UINT32 rgb_t;

/* an rgb15_t is a single combined 15-bit R,G,B value */
typedef UINT16 rgb15_t;

/* a palette is an opaque, reference counted object */
typedef struct _palette_t palette_t;

/* a palette client is someone who is tracking the dirty state of a palette */
typedef struct _palette_client palette_client;



/***************************************************************************
    MACROS
***************************************************************************/

/* macros to assemble rgb_t values */
#define MAKE_ARGB(a,r,g,b) 	((((rgb_t)(a) & 0xff) << 24) | (((rgb_t)(r) & 0xff) << 16) | (((rgb_t)(g) & 0xff) << 8) | ((rgb_t)(b) & 0xff))
#define MAKE_RGB(r,g,b)		(MAKE_ARGB(255,r,g,b))

/* macros to extract components from rgb_t values */
#define RGB_ALPHA(rgb)		(((rgb) >> 24) & 0xff)
#define RGB_RED(rgb)		(((rgb) >> 16) & 0xff)
#define RGB_GREEN(rgb)		(((rgb) >> 8) & 0xff)
#define RGB_BLUE(rgb)		((rgb) & 0xff)

/* common colors */
#define RGB_BLACK			(MAKE_ARGB(255,0,0,0))
#define RGB_WHITE			(MAKE_ARGB(255,255,255,255))



/***************************************************************************
    FUNCTION PROTOTYPES
***************************************************************************/


/* ----- palette allocation ----- */

/* allocate a new palette object and take a single reference on it */
palette_t *palette_alloc(UINT32 numcolors, UINT32 numgroups);

/* reference a palette object, incrementing its reference count */
void palette_ref(palette_t *palette);

/* dereference a palette object; if the reference count goes to 0, it is freed */
void palette_deref(palette_t *palette);



/* ----- palette information ----- */

/* return the number of colors managed by the palette */
int palette_get_num_colors(palette_t *palette);

/* return the number of groups managed by the palette */
int palette_get_num_groups(palette_t *palette);

/* return the maximum allowed index (i.e., length of arrays returned by palette_entry_list*) */
int palette_get_max_index(palette_t *palette);

/* return the index of the black entry */
UINT32 palette_get_black_entry(palette_t *palette);

/* return the index of the white entry */
UINT32 palette_get_white_entry(palette_t *palette);



/* ----- palette clients ----- */

/* add a new client to a palette */
palette_client *palette_client_alloc(palette_t *palette);

/* remove a client from a palette */
void palette_client_free(palette_client *client);

/* return a pointer to the palette for this client */
palette_t *palette_client_get_palette(palette_client *client);

/* atomically get the current dirty list for a client */
const UINT32 *palette_client_get_dirty_list(palette_client *client, UINT32 *mindirty, UINT32 *maxdirty);



/* ----- color management ----- */

/* set the raw RGB color for a given palette index */
void palette_entry_set_color(palette_t *palette, UINT32 index, rgb_t rgb);

/* return the raw RGB color for a given palette index */
rgb_t palette_entry_get_color(palette_t *palette, UINT32 index);

/* return the adjusted RGB color (after all adjustments) for a given palette index */
rgb_t palette_entry_get_adjusted_color(palette_t *palette, UINT32 index);

/* return the entire palette as an array of raw RGB values */
const rgb_t *palette_entry_list_raw(palette_t *palette);

/* return the entire palette as an array of adjusted RGB values */
const rgb_t *palette_entry_list_adjusted(palette_t *palette);

/* return the entire palette as an array of adjusted RGB-15 values */
const rgb_t *palette_entry_list_adjusted_rgb15(palette_t *palette);



/* ----- palette adjustments ----- */

/* set the overall brightness for the palette */
void palette_set_brightness(palette_t *palette, float brightness);

/* set the overall contrast for the palette */
void palette_set_contrast(palette_t *palette, float contrast);

/* set the overall gamma for the palette */
void palette_set_gamma(palette_t *palette, float gamma);

/* set the contrast adjustment for a single palette index */
void palette_entry_set_contrast(palette_t *palette, UINT32 index, float contrast);

/* return the contrast adjustment for a single palette index */
float palette_entry_get_contrast(palette_t *palette, UINT32 index);

/* configure overall brightness for a palette group */
void palette_group_set_brightness(palette_t *palette, UINT32 group, float brightness);

/* configure overall contrast for a palette group */
void palette_group_set_contrast(palette_t *palette, UINT32 group, float contrast);



/* ----- palette utilities ----- */

/* normalize a range of palette entries, mapping minimum brightness to lum_min and maximum
   brightness to lum_max; if either value is < 0, that boundary value is not modified */
void palette_normalize_range(palette_t *palette, UINT32 start, UINT32 end, int lum_min, int lum_max);



/***************************************************************************
    INLINE FUNCTIONS
***************************************************************************/

/*-------------------------------------------------
    rgb_to_rgb15 - convert an RGB triplet to
    a 15-bit OSD-specified RGB value
-------------------------------------------------*/

INLINE rgb15_t rgb_to_rgb15(rgb_t rgb)
{
	return ((RGB_RED(rgb) >> 3) << 10) | ((RGB_GREEN(rgb) >> 3) << 5) | ((RGB_BLUE(rgb) >> 3) << 0);
}


/*-------------------------------------------------
    rgb_clamp - clamp an RGB component to 0-255
-------------------------------------------------*/

INLINE UINT8 rgb_clamp(INT32 value)
{
	if (value < 0)
		return 0;
	if (value > 255)
		return 255;
	return value;
}


/*-------------------------------------------------
    pal1bit - convert a 1-bit value to 8 bits
-------------------------------------------------*/

INLINE UINT8 pal1bit(UINT8 bits)
{
	return (bits & 1) ? 0xff : 0x00;
}


/*-------------------------------------------------
    pal2bit - convert a 2-bit value to 8 bits
-------------------------------------------------*/

INLINE UINT8 pal2bit(UINT8 bits)
{
	bits &= 3;
	return (bits << 6) | (bits << 4) | (bits << 2) | bits;
}


/*-------------------------------------------------
    pal3bit - convert a 3-bit value to 8 bits
-------------------------------------------------*/

INLINE UINT8 pal3bit(UINT8 bits)
{
	bits &= 7;
	return (bits << 5) | (bits << 2) | (bits >> 1);
}


/*-------------------------------------------------
    pal4bit - convert a 4-bit value to 8 bits
-------------------------------------------------*/

INLINE UINT8 pal4bit(UINT8 bits)
{
	bits &= 0xf;
	return (bits << 4) | bits;
}


/*-------------------------------------------------
    pal5bit - convert a 5-bit value to 8 bits
-------------------------------------------------*/

INLINE UINT8 pal5bit(UINT8 bits)
{
	bits &= 0x1f;
	return (bits << 3) | (bits >> 2);
}


/*-------------------------------------------------
    pal6bit - convert a 6-bit value to 8 bits
-------------------------------------------------*/

INLINE UINT8 pal6bit(UINT8 bits)
{
	bits &= 0x3f;
	return (bits << 2) | (bits >> 4);
}


/*-------------------------------------------------
    pal7bit - convert a 7-bit value to 8 bits
-------------------------------------------------*/

INLINE UINT8 pal7bit(UINT8 bits)
{
	bits &= 0x7f;
	return (bits << 1) | (bits >> 6);
}


#endif	/* __PALETTE_H__ */
