151 lines
4.5 KiB
C++
151 lines
4.5 KiB
C++
/*
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* This file is part of RawTherapee.
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*
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* Copyright (c) 2004-2010 Gabor Horvath <hgabor@rawtherapee.com>
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*
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* RawTherapee is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* RawTherapee is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with RawTherapee. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <cmath>
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#include <cstring>
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#include <cstdio>
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#include "rt_math.h"
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#include "utils.h"
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#include "rt_math.h"
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using namespace std;
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namespace rtengine {
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void bilinearInterp (const unsigned char* src, int sw, int sh, unsigned char* dst, int dw, int dh) {
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int ix = 0;
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for (int i=0; i<dh; i++) {
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int sy = i*sh/dh;
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if (sy>=sh) sy = sh-1;
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double dy = (double)i*sh/dh - sy;
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int ny = sy+1;
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if (ny>=sh) ny = sy;
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int or1 = 3*sw*sy;
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int or2 = 3*sw*ny;
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for (int j=0; j<dw; j++) {
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int sx = j*sw/dw;
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if (sx>=sw) sx = sw;
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double dx = (double)j*sw/dw - sx;
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int nx = sx+1;
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if (nx>=sw) nx = sx;
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int ofs11 = or1 + 3*sx;
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int ofs12 = or1 + 3*nx;
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int ofs21 = or2 + 3*sx;
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int ofs22 = or2 + 3*nx;
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unsigned int val = src[ofs11]*(1-dx)*(1-dy) + src[ofs12]*dx*(1-dy) + src[ofs21]*(1-dx)*dy + src[ofs22]*dx*dy;
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dst[ix++] = val;
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ofs11++; ofs12++; ofs21++; ofs22++;
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val = src[ofs11]*(1-dx)*(1-dy) + src[ofs12]*dx*(1-dy) + src[ofs21]*(1-dx)*dy + src[ofs22]*dx*dy;
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dst[ix++] = val;
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ofs11++; ofs12++; ofs21++; ofs22++;
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val = src[ofs11]*(1-dx)*(1-dy) + src[ofs12]*dx*(1-dy) + src[ofs21]*(1-dx)*dy + src[ofs22]*dx*dy;
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dst[ix++] = val;
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}
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}
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}
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void nearestInterp (const unsigned char* src, int sw, int sh, unsigned char* dst, int dw, int dh) {
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int ix = 0;
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for (int i=0; i<dh; i++) {
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int rofs = sw * (i * sh / dh);
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for (int j=0; j<dw; j++) {
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int dx = rofs + j * sw / dw;
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dx *= 3;
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dst[ix++] = src[dx++];
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dst[ix++] = src[dx++];
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dst[ix++] = src[dx++];
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}
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}
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}
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void rotate (unsigned char* img, int& w, int& h, int deg) {
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if (deg==0) {
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return;
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}
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unsigned char* rotated = new unsigned char[3*w*h];
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int ix = 0;
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if (deg==90) {
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for (int i=0; i<h; i++)
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for (int j=0; j<w; j++) {
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rotated[3*(j*h+h-i-1)+0] = img[ix++];
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rotated[3*(j*h+h-i-1)+1] = img[ix++];
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rotated[3*(j*h+h-i-1)+2] = img[ix++];
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}
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int tmp = w;
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w = h;
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h = tmp;
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}
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else if (deg==270) {
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for (int i=0; i<h; i++)
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for (int j=0; j<w; j++) {
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rotated[3*(h*(w-j-1)+i)+0] = img[ix++];
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rotated[3*(h*(w-j-1)+i)+1] = img[ix++];
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rotated[3*(h*(w-j-1)+i)+2] = img[ix++];
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}
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int tmp = w;
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w = h;
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h = tmp;
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}
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else if (deg==180)
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for (int i=0; i<h; i++)
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for (int j=0; j<w; j++) {
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rotated[3*(w*(h-i-1)+w-j-1)+0] = img[ix++];
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rotated[3*(w*(h-i-1)+w-j-1)+1] = img[ix++];
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rotated[3*(w*(h-i-1)+w-j-1)+2] = img[ix++];
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}
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memcpy (img, rotated, 3*w*h);
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delete [] rotated;
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}
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void hflip (unsigned char* img, int w, int h) {
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unsigned char* flipped = new unsigned char[3*w*h];
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int ix = 0;
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for (int i=0; i<h; i++)
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for (int j=0; j<w; j++) {
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flipped[3*(w*i+w-1-j)+0] = img[ix++];
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flipped[3*(w*i+w-1-j)+1] = img[ix++];
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flipped[3*(w*i+w-1-j)+2] = img[ix++];
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}
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memcpy (img, flipped, 3*w*h);
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delete [] flipped;
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}
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void vflip (unsigned char* img, int w, int h) {
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unsigned char* flipped = new unsigned char[3*w*h];
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int ix = 0;
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for (int i=0; i<h; i++)
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for (int j=0; j<w; j++) {
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flipped[3*(w*(h-1-i)+j)+0] = img[ix++];
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flipped[3*(w*(h-1-i)+j)+1] = img[ix++];
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flipped[3*(w*(h-1-i)+j)+2] = img[ix++];
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}
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memcpy (img, flipped, 3*w*h);
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delete [] flipped;
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}
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}
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