git.sesse.net Git - kdenlive/blob - src/colorcorrection/waveformgenerator.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2010 by Simon Andreas Eugster (simon.eu@gmail.com)      *
   3  *   This file is part of kdenlive. See www.kdenlive.org.                  *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  ***************************************************************************/
  10
  11 #include <cmath>
  12
  13 #include <QColor>
  14 #include <QImage>
  15 #include <QPainter>
  16 #include <QSize>
  17 #include <QTime>
  18
  19 #include "waveformgenerator.h"
  20
  21 #define CHOP255(a) ((255) < (a) ? (255) : (a))
  22
  23 WaveformGenerator::WaveformGenerator()
  24 {
  25 }
  26
  27 WaveformGenerator::~WaveformGenerator()
  28 {
  29 }
  30
  31 QImage WaveformGenerator::calculateWaveform(const QSize &waveformSize, const QImage &image, WaveformGenerator::PaintMode paintMode,
  32                                             const bool &drawAxis, WaveformGenerator::Rec rec, const uint &accelFactor)
  33 {
  34     Q_ASSERT(accelFactor >= 1);
  35
  36     //QTime time;
  37     //time.start();
  38
  39     QImage wave(waveformSize, QImage::Format_ARGB32);
  40
  41     if (waveformSize.width() <= 0 || waveformSize.height() <= 0 || image.width() <= 0 || image.height() <= 0) {
  42         return QImage();
  43
  44     } else {
  45
  46         // Fill with transparent color
  47         wave.fill(qRgba(0,0,0,0));
  48
  49         QRgb *col;
  50
  51         double dY, dx, dy;
  52
  53         const uint ww = waveformSize.width();
  54         const uint wh = waveformSize.height();
  55         const uint iw = image.bytesPerLine();
  56         const uint ih = image.height();
  57         const uint byteCount = iw*ih;
  58
  59         uint waveValues[waveformSize.width()][waveformSize.height()];
  60         for (int i = 0; i < waveformSize.width(); i++) {
  61             for (int j = 0; j < waveformSize.height(); j++) {
  62                 waveValues[i][j] = 0;
  63             }
  64         }
  65
  66         // Number of input pixels that will fall on one scope pixel.
  67         // Must be a float because the acceleration factor can be high, leading to <1 expected px per px.
  68         const float pixelDepth = (float)((byteCount>>2) / accelFactor)/(ww*wh);
  69         const float gain = 255/(8*pixelDepth);
  70         //qDebug() << "Pixel depth: expected " << pixelDepth << "; Gain: using " << gain << " (acceleration: " << accelFactor << "x)";
  71
  72
  73         // Subtract 1 from sizes because we start counting from 0.
  74         // Not doing it would result in attempts to paint outside of the image.
  75         const float hPrediv = (float)(wh-1)/255;
  76         const float wPrediv = (float)(ww-1)/(iw-1);
  77
  78         const uchar *bits = image.bits();
  79         const int bpp = image.depth() / 8;
  80
  81         for (uint i = 0, x = 0; i < byteCount; i += bpp) {
  82
  83             Q_ASSERT(bits < image.bits() + byteCount);
  84
  85             col = (QRgb *)bits;
  86
  87             if (rec == WaveformGenerator::Rec_601) {
  88                 // CIE 601 Luminance
  89                 dY = .299*qRed(*col) + .587*qGreen(*col) + .114*qBlue(*col);
  90             } else {
  91                 // CIE 709 Luminance
  92                 dY = .2125*qRed(*col) + .7154*qGreen(*col) + .0721*qBlue(*col);
  93             }
  94             // dY is on [0,255] now.
  95
  96             dy = dY*hPrediv;
  97             dx = x*wPrediv;
  98             waveValues[(int)dx][(int)dy]++;
  99
 100             bits += bpp;
 101             x += bpp;
 102             if (x > iw) {
 103                 x -= iw;
 104                 if (accelFactor > 1) {
 105                     bits += bpp*iw*(accelFactor-1);
 106                     i += bpp*iw*(accelFactor-1);
 107                 }
 108             }
 109         }
 110
 111         switch (paintMode) {
 112         case PaintMode_Green:
 113             for (int i = 0; i < waveformSize.width(); i++) {
 114                 for (int j = 0; j < waveformSize.height(); j++) {
 115                     // Logarithmic scale. Needs fine tuning by hand, but looks great.
 116                     wave.setPixel(i, waveformSize.height()-j-1, qRgba(CHOP255(52*log(0.1*gain*waveValues[i][j])),
 117                                                                       CHOP255(52*log(gain*waveValues[i][j])),
 118                                                                       CHOP255(52*log(.25*gain*waveValues[i][j])),
 119                                                                       CHOP255(64*log(gain*waveValues[i][j]))));
 120                 }
 121             }
 122             break;
 123         case PaintMode_Yellow:
 124             for (int i = 0; i < waveformSize.width(); i++) {
 125                 for (int j = 0; j < waveformSize.height(); j++) {
 126                     wave.setPixel(i, waveformSize.height()-j-1, qRgba(255,242,0,   CHOP255(gain*waveValues[i][j])));
 127                 }
 128             }
 129             break;
 130         default:
 131             for (int i = 0; i < waveformSize.width(); i++) {
 132                 for (int j = 0; j < waveformSize.height(); j++) {
 133                     wave.setPixel(i, waveformSize.height()-j-1, qRgba(255,255,255, CHOP255(2*gain*waveValues[i][j])));
 134                 }
 135             }
 136             break;
 137         }
 138
 139         if (drawAxis) {
 140             QPainter davinci(&wave);
 141             QRgb opx;
 142             davinci.setPen(qRgba(150,255,200,32));
 143             davinci.setCompositionMode(QPainter::CompositionMode_Overlay);
 144             for (uint i = 0; i <= 10; i++) {
 145                 dy = (float)i/10 * (wh-1);
 146                 for (uint x = 0; x < ww; x++) {
 147                     opx = wave.pixel(x, dy);
 148                     wave.setPixel(x,dy, qRgba(CHOP255(150+qRed(opx)), 255,
 149                                               CHOP255(200+qBlue(opx)), CHOP255(32+qAlpha(opx))));
 150                 }
 151             }
 152         }
 153
 154     }
 155
 156     //uint diff = time.elapsed();
 157     //emit signalCalculationFinished(wave, diff);
 158
 159     return wave;
 160 }
 161 #undef CHOP255