/**************************************************************************** * apps/graphics/traveler/tools/libwld/wld_loadpaltable.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) 2016 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 *************************************************************************/ /* If the following switch is false, then the whole g_pal_table is loaded from * the file. Otherwise, the g_pal_table will be calculated from a range * table */ #define USE_PAL_RANGES true #include "trv_types.h" #include "wld_world.h" #include "wld_paltable.h" #if (!MSWINDOWS) # include "wld_bitmaps.h" # include "wld_color.h" #endif #include "wld_mem.h" #include "wld_utils.h" /************************************************************************* * Pre-processor Definitions *************************************************************************/ /* This indicates the maximum number of palette ranges which may be * specified in the file */ #if USE_PAL_RANGES # define MAX_PAL_RANGES 64 #endif /************************************************************************* * Private Type Definitions ************************************************************************/ #if USE_PAL_RANGES typedef struct { uint8_t firstColor; int8_t colorRange; uint8_t clipColor; } pal_range_t; #endif /************************************************************************* * Public Data *************************************************************************/ /* This is the palette table which is used to adjust the texture values * with distance */ trv_pixel_t *g_pal_table[NUM_ZONES]; /************************************************************************* * Private Functions *************************************************************************/ /************************************************************************* * Name: wld_allocate_paltable * Description: ************************************************************************/ static void wld_allocate_paltable(uint32_t palTabEntrySize) { int i; for (i = 0; i < NUM_ZONES; i++) { g_pal_table[i] = (trv_pixel_t *) wld_malloc(palTabEntrySize * sizeof(trv_pixel_t)); } } /************************************************************************* * Public Functions *************************************************************************/ /************************************************************************* * Name: wld_load_paltable * Description: * This function loads the g_pal_table from the specified file ************************************************************************/ uint8_t wld_load_paltable(char *file) { #if (!MSWINDOWS) trv_pixel_t *palptr; color_lum_t lum; int16_t zone; float scale; int pixel; /* Allocate memory to hold the palette range mapping data */ wld_allocate_paltable(TRV_PIXEL_MAX + 1); /* The first zone is just the identity transformation */ palptr = g_pal_table[0]; for (pixel = 0; pixel <= TRV_PIXEL_MAX; pixel++) { *palptr++ = pixel; } /* Process each remaining distance zone */ for (zone = 1; zone < NUM_ZONES; zone++) { /* Point to the palette mapping data for this zone */ palptr = g_pal_table[zone]; /* Calculate the luminance scaling factor to use for this zone */ scale = (float)(NUM_ZONES - zone) / (float)NUM_ZONES; /* Scale each element of the palette */ for (pixel = 0; pixel <= TRV_PIXEL_MAX; pixel++) { /* Get the unit vector + luminance representation of the pixel */ wld_pixel2lum(pixel, &lum); /* Re-scale the luminance component by range scale factor */ lum.luminance *= scale; /* Then save the pixel associated with this scaled value in the range * palette table */ *palptr++ = wld_lum2pixel(&lum); } } return WORLD_SUCCESS; #else # if USE_PAL_RANGES FILE *fp, *fopen(); int16_t i; int16_t nranges; int16_t zone; int16_t palndx; trv_pixel_t plotcolor; trv_pixel_t *palptr; pal_range_t ranges[MAX_PAL_RANGES]; /* Open the file which contains the palette table */ fp = fopen(file, "r"); if (!fp) { return PALR_FILE_OPEN_ERROR; } /* Read the number of ranges from the file */ nranges = wld_read_decimal(fp); if (nranges > MAX_PAL_RANGES) { fclose(fp); return PALR_TOO_MANY_RANGES; } /* Then read all of the palette range data from the file */ for (i = 0; i < nranges; i++) { ranges[i].firstColor = wld_read_decimal(fp); ranges[i].colorRange = wld_read_decimal(fp); ranges[i].clipColor = wld_read_decimal(fp); } /* We are now done with the input file */ fclose(fp); /* Allocate memory to hold the palette range mapping data */ wld_allocate_paltable(PALETTE_SIZE); /* Process each distance zone */ for (zone = 0; zone < NUM_ZONES; zone++) { /* Point to the palette mapping data for this zone */ palptr = g_pal_table[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_pal_table */ palptr[palndx] = plotcolor; } } return WORLD_SUCCESS; # else FILE *fp; int16_t zone; int16_t palndx; uint8_t plotcolor; uint8_t *palptr; /* Allocate memory to hold the palette range mapping data */ wld_allocate_paltable(); /* Open the file which contains the palette table */ fp = fopen(file, "r"); if (!fp) { return PALR_FILE_OPEN_ERROR; } /* 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_pal_table */ palptr[palndx] = wld_read_decimal(fp); } } fclose(fp); return WORLD_SUCESS; # endif /* USE_PAL_RANGES */ #endif /* !MSWINDOWS */ }