mirror of
https://github.com/ZDoom/raze-gles.git
synced 2024-12-27 04:00:42 +00:00
135 lines
No EOL
4.4 KiB
C++
135 lines
No EOL
4.4 KiB
C++
|
|
/*
|
|
** 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];
|
|
PalEntry BaseColors[256];
|
|
PalEntry BasePalette[256]; // same as above, but with a being a proper alpha channel.
|
|
int WhiteIndex, BlackIndex;
|
|
int alphaThreshold;
|
|
ColorTable256k RGB256k;
|
|
|
|
int BestColor(int r, int g, int b, int first, int num)
|
|
{
|
|
const PalEntry* pal = BaseColors;
|
|
int bestcolor = first;
|
|
int bestdist = 257 * 257 + 257 * 257 + 257 * 257;
|
|
|
|
for (int color = first; color < num; color++)
|
|
{
|
|
if (pal[color].a > 0) continue; // marks a fullbright color which we should not pick here
|
|
int x = r - pal[color].r;
|
|
int y = g - pal[color].g;
|
|
int z = b - pal[color].b;
|
|
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)
|
|
{
|
|
const PalEntry* pal = BaseColors;
|
|
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 - pal[color].r)];
|
|
double y = powtable[abs(g - pal[color].g)];
|
|
double z = powtable[abs(b - pal[color].b)];
|
|
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)
|
|
{
|
|
for (int i = 0; i < 255; i++)
|
|
{
|
|
BasePalette[i] = BaseColors[i] = colors[i];
|
|
BasePalette[i].a = 255;
|
|
}
|
|
BasePalette[255] = BaseColors[255] = 0; // 255 is always translucent black - whatever color the original data has here
|
|
|
|
// 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));
|
|
}
|
|
|
|
|
|
} |