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// Gmsh - Copyright (C) 1997-2020 C. Geuzaine, J.-F. Remacle
//
// See the LICENSE.txt file for license information. Please report all
// issues on https://gitlab.onelab.info/gmsh/gmsh/issues.
/*
* This code is based on the rgbtoycc.c code from the MPEG-1 Video
* Software Encoder (Version 1.5; February 1, 1995), by Lawrence
* A. Rowe, Kevin Gong, Eugene Hung, Ketan Patel, Steve Smoot and Dan
* Wallach Computer Science Division-EECS, Univ. of Calif. at Berkeley
*
* Copyright (c) 1995 The Regents of the University of California.
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose, without fee, and without written agreement is
* hereby granted, provided that the above copyright notice and the following
* two paragraphs appear in all copies of this software.
*
* IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
* CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*/
#include "MallocUtils.h"
#include "gl2yuv.h"
void create_yuv(FILE *outfile, PixelBuffer *buffer)
{
if(buffer->getFormat() != GL_RGB || buffer->getType() != GL_UNSIGNED_BYTE) {
Msg::Error("YUV only implemented for GL_RGB and GL_UNSIGNED_BYTE");
return;
}
int x, y;
unsigned char *dy0, *dy1;
unsigned char *dcr, *dcb;
unsigned char *src0, *src1;
int cdivisor;
static int first = 1;
static float mult299[1024], mult587[1024], mult114[1024];
static float mult16874[1024], mult33126[1024], mult5[1024];
static float mult41869[1024], mult08131[1024];
unsigned char **orig_y, **orig_cr, **orig_cb;
if(first) {
int index;
int maxValue;
maxValue = 255;
for(index = 0; index <= maxValue; index++) {
mult299[index] = index * 0.29900F;
mult587[index] = index * 0.58700F;
mult114[index] = index * 0.11400F;
mult16874[index] = -0.16874F * index;
mult33126[index] = -0.33126F * index;
mult5[index] = index * 0.50000F;
mult41869[index] = -0.41869F * index;
mult08131[index] = -0.08131F * index;
}
first = 0;
}
int width = buffer->getWidth();
int height = buffer->getHeight();
unsigned char *pixels = (unsigned char *)buffer->getPixels();
// yuv format assumes even number of rows and columns
height -= height % 2;
width -= width % 2;
int row_stride = width * 3;
orig_y = (unsigned char **)Malloc(sizeof(unsigned char *) * height);
for(y = 0; y < height; y++) {
orig_y[y] = (unsigned char *)Malloc(sizeof(unsigned char) * width);
}
orig_cr = (unsigned char **)Malloc(sizeof(char *) * height / 2);
for(y = 0; y < height / 2; y++) {
orig_cr[y] = (unsigned char *)Malloc(sizeof(char) * width / 2);
}
orig_cb = (unsigned char **)Malloc(sizeof(char *) * height / 2);
for(y = 0; y < height / 2; y++) {
orig_cb[y] = (unsigned char *)Malloc(sizeof(char) * width / 2);
}
// assume ydivisor = 1, so cdivisor = 4
cdivisor = 4;
for(y = 0; y < height; y += 2) {
src0 = &(pixels[y * row_stride]);
src1 = &(pixels[(y + 1) * row_stride]);
dy0 = orig_y[y];
dy1 = orig_y[y + 1];
dcr = orig_cr[y / 2];
dcb = orig_cb[y / 2];
for(x = 0; x < width;
x += 2, dy0 += 2, dy1 += 2, dcr++, dcb++, src0 += 6, src1 += 6) {
*dy0 =
(unsigned char)(mult299[*src0] + mult587[src0[1]] + mult114[src0[2]]);
*dy1 =
(unsigned char)(mult299[*src1] + mult587[src1[1]] + mult114[src1[2]]);
dy0[1] =
(unsigned char)(mult299[src0[3]] + mult587[src0[4]] + mult114[src0[5]]);
dy1[1] =
(unsigned char)(mult299[src1[3]] + mult587[src1[4]] + mult114[src1[5]]);
*dcb = (unsigned char)((mult16874[*src0] + mult33126[src0[1]] +
mult5[src0[2]] + mult16874[*src1] +
mult33126[src1[1]] + mult5[src1[2]] +
mult16874[src0[3]] + mult33126[src0[4]] +
mult5[src0[5]] + mult16874[src1[3]] +
mult33126[src1[4]] + mult5[src1[5]]) /
cdivisor) +
128;
*dcr = (unsigned char)((mult5[*src0] + mult41869[src0[1]] +
mult08131[src0[2]] + mult5[*src1] +
mult41869[src1[1]] + mult08131[src1[2]] +
mult5[src0[3]] + mult41869[src0[4]] +
mult08131[src0[5]] + mult5[src1[3]] +
mult41869[src1[4]] + mult08131[src1[5]]) /
cdivisor) +
128;
}
}
// Y
for(y = height - 1; y >= 0; y--) fwrite(orig_y[y], 1, width, outfile);
// U
for(y = height / 2 - 1; y >= 0; y--)
fwrite(orig_cb[y], 1, width / 2, outfile);
// V
for(y = height / 2 - 1; y >= 0; y--)
fwrite(orig_cr[y], 1, width / 2, outfile);
for(y = 0; y < height; y++) Free(orig_y[y]);
Free(orig_y);
for(y = 0; y < height / 2; y++) Free(orig_cr[y]);
Free(orig_cr);
for(y = 0; y < height / 2; y++) Free(orig_cb[y]);
Free(orig_cb);
}
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