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 <QColor>
  12 #include <QImage>
  13 #include <QPainter>
  14 #include <QSize>
  15 #include <QTime>
  16
  17 #include "waveformgenerator.h"
  18
  19 #define CHOP255(a) ((255) < (a) ? (255) : (a))
  20
  21 WaveformGenerator::WaveformGenerator()
  22 {
  23 }
  24
  25 WaveformGenerator::~WaveformGenerator()
  26 {
  27 }
  28
  29 QImage WaveformGenerator::calculateWaveform(const QSize &waveformSize, const QImage &image, WaveformGenerator::PaintMode paintMode,
  30                                             const bool &drawAxis, const uint &accelFactor)
  31 {
  32     Q_ASSERT(accelFactor >= 1);
  33
  34     QTime time;
  35     time.start();
  36
  37     QImage wave(waveformSize, QImage::Format_ARGB32);
  38
  39     if (waveformSize.width() <= 0 || waveformSize.height() <= 0 || image.width() <= 0 || image.height() <= 0) {
  40         return QImage();
  41
  42     } else {
  43
  44         // Fill with transparent color
  45         wave.fill(qRgba(0,0,0,0));
  46
  47         QRgb *col;
  48         QRgb waveCol;
  49         QPoint wavePoint;
  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         // Subtract 1 from sizes because we start counting from 0.
  60         // Not doing it would result in attempts to paint outside of the image.
  61         const float hPrediv = (float)(wh-1)/255;
  62         const float wPrediv = (float)(ww-1)/(iw-1);
  63
  64         const float brightnessAdjustment = accelFactor * ((float) ww*wh/(byteCount>>3));
  65
  66         const uchar *bits = image.bits();
  67         const uint stepsize = 4*accelFactor;
  68
  69         for (uint i = 0, x = 0; i < byteCount; i += stepsize) {
  70
  71             col = (QRgb *)bits;
  72
  73             // CIE 601 Luminance
  74             // dY is on [0,255] now.
  75             dY = .299*qRed(*col) + .587*qGreen(*col) + .114*qBlue(*col);
  76
  77             dy = dY*hPrediv;
  78             dx = x*wPrediv;
  79             wavePoint = QPoint((int)dx, (int)(wh-1 - dy));
  80
  81             waveCol = QRgb(wave.pixel(wavePoint));
  82             switch (paintMode) {
  83             case PaintMode_Green:
  84                 wave.setPixel(wavePoint, qRgba(CHOP255(9 + qRed(waveCol)), CHOP255(36 + qGreen(waveCol)),
  85                                                CHOP255(18 + qBlue(waveCol)), 255));
  86                 break;
  87             default:
  88                 wave.setPixel(wavePoint, qRgba(255, 242,
  89                                                0, CHOP255(brightnessAdjustment*10+qAlpha(waveCol))));
  90                 break;
  91             }
  92
  93             bits += stepsize;
  94             x += stepsize;
  95             x %= iw; // Modulo image width, to represent the current x position in the image
  96         }
  97
  98         if (drawAxis) {
  99             QPainter davinci(&wave);
 100             QRgb opx;
 101             davinci.setPen(qRgba(150,255,200,32));
 102             davinci.setCompositionMode(QPainter::CompositionMode_Overlay);
 103             for (uint i = 0; i <= 10; i++) {
 104                 dy = (float)i/10 * (wh-1);
 105                 for (uint x = 0; x < ww; x++) {
 106                     opx = wave.pixel(x, dy);
 107                     wave.setPixel(x,dy, qRgba(CHOP255(150+qRed(opx)), 255,
 108                                               CHOP255(200+qBlue(opx)), CHOP255(32+qAlpha(opx))));
 109                 }
 110             }
 111         }
 112
 113     }
 114
 115     uint diff = time.elapsed();
 116     emit signalCalculationFinished(wave, diff);
 117
 118     return wave;
 119 }
 120 #undef CHOP255