raze/source/core/textures/imagehelpers.cpp
Christoph Oelckers e2f5e8fe34 - renamed 'common' to 'core'.
We'll need 'common' for something else.
2020-04-12 08:30:36 +02:00

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/*
** imagehelpers.cpp
** Utilities for image conversion - mostly 8 bit paletted baggage
**
**---------------------------------------------------------------------------
** Copyright 2004-2007 Randy Heit
** Copyright 2006-2018 Christoph Oelckers
** All rights reserved.
**
** 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. The name of the author may not be used to endorse or promote products
** derived from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
**---------------------------------------------------------------------------
**
**
*/
#include "imagehelpers.h"
namespace ImageHelpers
{
uint8_t GrayMap[256];
int WhiteIndex, BlackIndex;
int alphaThreshold;
ColorTable256k RGB256k;
_BasePalette BasePalette;
int BestColor(int r, int g, int b, int first, int num)
{
int bestcolor = first;
int bestdist = 257 * 257 + 257 * 257 + 257 * 257;
for (int color = first; color < num; color++)
{
int x = r - palette[color * 3 + 0];
int y = g - palette[color * 3 + 1];
int z = b - palette[color * 3 + 2];
int dist = x * x + y * y + z * z;
if (dist < bestdist)
{
if (dist == 0)
return color;
bestdist = dist;
bestcolor = color;
}
}
return bestcolor;
}
// [SP] Re-implemented BestColor for more precision rather than speed. This function is only ever called once until the game palette is changed.
int PTM_BestColor(int r, int g, int b, bool reverselookup, float powtable_val, int first, int num)
{
static double powtable[256];
static bool firstTime = true;
static float trackpowtable = 0.;
double fbestdist = DBL_MAX, fdist;
int bestcolor = 0;
if (firstTime || trackpowtable != powtable_val)
{
auto pt = powtable_val;
trackpowtable = pt;
firstTime = false;
for (int x = 0; x < 256; x++) powtable[x] = pow((double)x / 255, (double)pt);
}
for (int color = first; color < num; color++)
{
double x = powtable[abs(r - palette[color * 3 + 0])];
double y = powtable[abs(g - palette[color * 3 + 1])];
double z = powtable[abs(b - palette[color * 3 + 2])];
fdist = x + y + z;
if (color == first || (reverselookup ? (fdist <= fbestdist) : (fdist < fbestdist)))
{
if (fdist == 0 && !reverselookup)
return color;
fbestdist = fdist;
bestcolor = color;
}
}
return bestcolor;
}
void SetPalette(const PalEntry* colors)
{
// Find white and black from the original palette so that they can be
// used to make an educated guess of the translucency % for a
// translucency map.
WhiteIndex = BestColor(255, 255, 255);
BlackIndex = BestColor(0, 0, 0);
// create the RGB666 lookup table
for (int r = 0; r < 64; r++)
for (int g = 0; g < 64; g++)
for (int b = 0; b < 64; b++)
RGB256k.RGB[r][g][b] = BestColor((r<<2)|(r>>4), (g<<2)|(g>>4), (b<<2)|(b>>4));
}
}