/*******************************************************************************
* apps/graphics/traveler/src/trv_paltbl.c
* This file contains the logic that creates the range palette table that is
* used to modify the palette with range to hit
*
* Copyright (C) 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name NuttX 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 THE
* COPYRIGHT OWNER OR CONTRIBUTORS 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.
*
****************************************************************************/
/****************************************************************************
* Included files
****************************************************************************/
#include "trv_types.h"
#include "trv_mem.h"
#include "trv_color.h"
#include "trv_fsutils.h"
#include "trv_world.h"
#include "trv_bitmaps.h"
#include "trv_paltable.h"
#include <stdio.h>
#include <errno.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* This indicates the maximum number of palette ranges which may be
* specified in the file
*/
#ifdef CONFIG_GRAPHICS_TRAVELER_PALRANGES
# define MAX_PAL_RANGES 64
#endif
/****************************************************************************
* Private Type Declarations
***************************************************************************/
#ifdef CONFIG_GRAPHICS_TRAVELER_PALRANGES
struct trv_palrange_s
{
uint8_t firstcolor;
int8_t colorrange;
uint8_t clipColor;
};
#endif
/****************************************************************************
* Public Data
****************************************************************************/
/* This is the palette table which is used to adjust the texture values
* with distance
*/
trv_pixel_t *g_paltable[NUM_ZONES];
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: trv_allocate_paltbl
*
* Description:
*
***************************************************************************/
static int trv_allocate_paltbl(uint32_t entrysize)
{
int i;
for (i = 0; i < NUM_ZONES; i++)
{
g_paltable[i] = (FAR trv_pixel_t*)
trv_malloc(entrysize * sizeof(trv_pixel_t));
if (g_paltable[i] == NULL)
{
return -ENOMEM;
}
}
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: trv_load_paltable
*
* Description:
* This function loads the g_paltable from the specified file
*
***************************************************************************/
int trv_load_paltable(FAR const char *file)
{
#ifdef CONFIG_GRAPHICS_TRAVELER_PALRANGES
struct trv_palrange_s ranges[MAX_PAL_RANGES];
trv_pixel_t plotcolor;
FAR trv_pixel_t *palptr;
FAR FILE *fp;
int16_t nranges;
int16_t zone;
int16_t palndx;
int ret;
int i;
/* Open the file which contains the palette table */
fp = fopen(file, "r");
if (!fp)
{
int errcode = errno;
fprintf(stderr, "ERROR: Failed to open %s: %d\n", file, errcode);
return -errcode;
}
/* Read the number of ranges from the file */
nranges = trv_read_decimal(fp);
if (nranges > MAX_PAL_RANGES)
{
fprintf(stderr, "ERROR: Too many ranges: %d\n", nranges);
fclose(fp);
return -E2BIG;
}
/* Then read all of the palette range data from the file */
for (i = 0; i < nranges; i++)
{
ranges[i].firstcolor = trv_read_decimal(fp);
ranges[i].colorrange = trv_read_decimal(fp);
ranges[i].clipColor = trv_read_decimal(fp);
}
/* We are now done with the input file */
fclose(fp);
/* Allocate memory to hold the palette range mapping data */
ret = trv_allocate_paltbl(PALETTE_SIZE);
if (ret < 0)
{
fprintf(stderr,
"ERROR: Failed to allocate range mapping table: %d\n",
ret);
return ret;
}
/* Process each distance zone */
for (zone = 0; zone < NUM_ZONES; zone++)
{
/* Point to the palette mapping data for this zone */
palptr = g_paltable[zone];
/* Process each possible palette index within the zone */
for (palndx = 0; palndx < PALETTE_SIZE; palndx++)
{
/* Assume that the range will not be found. In this case, we
* will perform the 1-to-1 mapping
*/
plotcolor = palndx;
/* Find the range the color is in. */
for (i = 0; i < nranges; i++)
{
/* Check if the color range is ascending or descending */
if (ranges[i].colorrange < 0)
{
/* The colors are descending */
if ((palndx <= ranges[i].firstcolor) &&
(palndx > (ranges[i].firstcolor + ranges[i].colorrange)))
{
/* Found it, set the new plotcolor */
if (plotcolor > zone)
{
/* Offset the color by the zone we are processing */
plotcolor -= zone;
/* Check if we have exceeded the range of this
* color. If so, then set the color to the
* clipColor
*/
if (plotcolor <= ranges[i].firstcolor + ranges[i].colorrange)
{
plotcolor = ranges[i].clipColor;
}
}
else
{
plotcolor = ranges[i].clipColor;
}
/* Now break out of the loop */
break;
}
}
/* The colors are ascending */
else if ((palndx >= ranges[i].firstcolor) &&
(palndx < (ranges[i].firstcolor + ranges[i].colorrange)))
{
/* Found it, set the new plotcolor */
plotcolor += zone;
/* Check if we have exceeded the range of this color. If so,
* then set the color to black
*/
if (plotcolor >= ranges[i].firstcolor + ranges[i].colorrange)
{
plotcolor = ranges[i].clipColor;
}
/* Now break out of the loop */
break;
}
}
/* Save the plotcolor in the g_paltable */
palptr[palndx] = plotcolor;
}
}
return OK;
#else
FILE *fp;
int16_t zone;
int16_t palndx;
FAR uint8_t *palptr;
int ret;
/* Allocate memory to hold the palette range mapping data */
ret = trv_allocate_paltbl(PALETTE_SIZE);
if (ret < 0)
{
fprintf(stderr,
"ERROR: Failed to allocate range mapping table: %d\n",
ret);
return ret;
}
/* Open the file which contains the palette table */
fp = fopen(file, "r");
if (!fp)
{
int errcode = errno;
fprintf(stderr, "ERROR: Failed to open %s: %d\n", file, errcode);
return -errcode;
}
/* Process each distance zone */
for (zone = 0; zone < NUM_ZONES; zone++)
{
/* Point to the palette mapping data for this zone */
palptr = GET_PALPTR(zone);
/* Process each possible palette index within the zone */
for (palndx = 0; palndx < PALETTE_SIZE; palndx++)
{
/* Read the data into g_paltable */
palptr[palndx] = trv_read_decimal(fp);
}
}
fclose(fp);
return OK;
#endif /* CONFIG_GRAPHICS_TRAVELER_PALRANGES */
}
/*************************************************************************
* Function: trv_release_paltable
*
* Description:
*
************************************************************************/
void trv_release_paltable(void)
{
int i;
for (i = 0; i < NUM_ZONES; i++)
{
if (g_paltable[i])
{
trv_free(g_paltable[i]);
g_paltable[i] = NULL;
}
}
}
