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146 lines
4.3 KiB
C++
146 lines
4.3 KiB
C++
#pragma once
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/*
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** imagehelpers.h
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** Utilities for image conversion - mostly 8 bit paletted baggage
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**
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**---------------------------------------------------------------------------
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** Copyright 2004-2007 Randy Heit
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** Copyright 2006-2018 Christoph Oelckers
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** All rights reserved.
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions
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** are met:
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**
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** 1. Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** 2. Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in the
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** documentation and/or other materials provided with the distribution.
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** 3. The name of the author may not be used to endorse or promote products
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** derived from this software without specific prior written permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**---------------------------------------------------------------------------
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**
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**
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*/
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#include <stdint.h>
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#include "tarray.h"
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#include "palentry.h"
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#include "textures/bitmap.h"
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namespace ImageHelpers
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{
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union ColorTable256k
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{
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uint8_t RGB[64][64][64];
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uint8_t All[64 * 64 * 64];
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};
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extern uint8_t GrayMap[256];
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extern PalEntry BaseColors[256];
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extern PalEntry BasePalette[256]; // same as above, but with a being a proper alpha channel.
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extern int WhiteIndex, BlackIndex;
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extern ColorTable256k RGB256k;
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extern int alphaThreshold;
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// Todo: This should not pick fullbright colors.
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int BestColor(int r, int g, int b, int first = 0, int num = 255);
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int PTM_BestColor(int r, int g, int b, bool reverselookup, float powtable_val, int first, int num);
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void SetPalette(const PalEntry* colors);
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// Helpers for creating paletted images.
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inline uint8_t *GetGraymap()
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{
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return GrayMap;
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}
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inline uint8_t RGBToPalettePrecise(bool wantluminance, int r, int g, int b, int a = 255)
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{
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return BestColor(r, g, b);
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}
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inline uint8_t RGBToPalette(bool wantluminance, int r, int g, int b, int a = 255)
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{
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return a < alphaThreshold? 255 : RGB256k.RGB[r >> 2][g >> 2][b >> 2];
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}
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inline uint8_t RGBToPalette(bool wantluminance, PalEntry pe, bool hasalpha = true)
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{
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return RGBToPalette(wantluminance, pe.r, pe.g, pe.b, hasalpha? pe.a : 255);
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}
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//==========================================================================
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//
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// Converts a texture between row-major and column-major format
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// by flipping it about the X=Y axis.
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//
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//==========================================================================
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template<class T>
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void FlipSquareBlock (T *block, int x)
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{
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for (int i = 0; i < x; ++i)
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{
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T *corner = block + x*i + i;
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int count = x - i;
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for (int j = 0; j < count; j++)
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{
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std::swap(corner[j], corner[j*x]);
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}
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}
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}
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inline void FlipSquareBlockRemap (uint8_t *block, int x, const uint8_t *remap)
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{
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for (int i = 0; i < x; ++i)
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{
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uint8_t *corner = block + x*i + i;
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int count = x - i;
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for (int j = 0; j < count; j++)
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{
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auto t = remap[corner[j]];
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corner[j] = remap[corner[j*x]];
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corner[j*x] = t;
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}
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}
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}
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template<class T>
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void FlipNonSquareBlock (T *dst, const T *src, int x, int y, int srcpitch)
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{
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for (int i = 0; i < x; ++i)
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{
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for (int j = 0; j < y; ++j)
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{
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dst[i*y+j] = src[i+j*srcpitch];
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}
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}
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}
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inline void FlipNonSquareBlockRemap (uint8_t *dst, const uint8_t *src, int x, int y, int srcpitch, const uint8_t *remap)
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{
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for (int i = 0; i < x; ++i)
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{
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for (int j = 0; j < y; ++j)
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{
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dst[i*y+j] = remap[src[i+j*srcpitch]];
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}
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}
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}
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}
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