1 /***************************************************************************
2 * Copyright (C) 2010 by Simon Andreas Eugster (simon.eu@gmail.com) *
3 * This file is part of kdenlive. See www.kdenlive.org. *
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 ***************************************************************************/
15 #include "histogramgenerator.h"
17 HistogramGenerator::HistogramGenerator()
21 QImage HistogramGenerator::calculateHistogram(const QSize ¶deSize, const QImage &image, const int &components,
22 const bool &unscaled, const uint &accelFactor) const
24 // qDebug() << "Histogram rect size is: " << paradeSize.width() << "/" << paradeSize.height();
25 if (paradeSize.height() <= 0 || paradeSize.width() <= 0 || image.width() <= 0 || image.height() <= 0) {
29 bool drawY = (components & HistogramGenerator::ComponentY) != 0;
30 bool drawR = (components & HistogramGenerator::ComponentR) != 0;
31 bool drawG = (components & HistogramGenerator::ComponentG) != 0;
32 bool drawB = (components & HistogramGenerator::ComponentB) != 0;
34 int r[256], g[256], b[256], y[256];
35 // Initialize the values to zero
36 std::fill(r, r+256, 0);
37 std::fill(g, g+256, 0);
38 std::fill(b, b+256, 0);
39 std::fill(y, y+256, 0);
41 const uint iw = image.bytesPerLine();
42 const uint ih = image.height();
43 const uint ww = paradeSize.width();
44 const uint wh = paradeSize.height();
45 const uint byteCount = iw*ih;
46 const uint stepsize = 4*accelFactor;
48 const uchar *bits = image.bits();
52 // Read the stats from the input image
53 for (uint i = 0; i < byteCount; i += stepsize) {
59 y[(int)floor(.299*qRed(*col) + .587*qGreen(*col) + .114*qBlue(*col))]++;
65 const int nParts = (drawY ? 1 : 0) + (drawR ? 1 : 0) + (drawG ? 1 : 0) + (drawB ? 1 : 0);
71 const int d = 20; // Distance for text
72 const int partH = (wh-nParts*d)/nParts;
73 const float scaling = (float)partH/(byteCount >> 7);
76 int wy = 0; // Drawing position
78 QImage histogram(paradeSize, QImage::Format_ARGB32);
79 QPainter davinci(&histogram);
80 davinci.setPen(QColor(220, 220, 220, 255));
81 histogram.fill(qRgba(0, 0, 0, 0));
84 // qDebug() << "Drawing Y at " << wy << " with height " << partH;
85 drawComponentFull(&davinci, y, scaling, QRect(0, wy, ww, partH + dist), QColor(220, 220, 210, 255), dist, unscaled);
91 // qDebug() << "Drawing R at " << wy << " with height " << partH;
92 drawComponentFull(&davinci, r, scaling, QRect(0, wy, ww, partH + dist), QColor(255, 128, 0, 255), dist, unscaled);
98 // qDebug() << "Drawing G at " << wy << " with height " << partH;
99 drawComponentFull(&davinci, g, scaling, QRect(0, wy, ww, partH + dist), QColor(128, 255, 0, 255), dist, unscaled);
104 // qDebug() << "Drawing B at " << wy << " with height " << partH;
105 drawComponentFull(&davinci, b, scaling, QRect(0, wy, ww, partH + dist), QColor(0, 128, 255, 255), dist, unscaled);
113 QImage HistogramGenerator::drawComponent(const int *y, const QSize &size, const float &scaling, const QColor &color, const bool &unscaled) const
115 QImage component(256, size.height(), QImage::Format_ARGB32);
116 component.fill(qRgba(0, 0, 0, 0));
117 Q_ASSERT(scaling != INFINITY);
119 const int partH = size.height();
122 for (int x = 0; x < 256; x++) {
123 // Calculate the height of the curve at position x
124 partY = scaling*y[x];
127 if (partY > partH-1) { partY = partH-1; }
128 partY = partH-1 - partY;
130 for (int k = partH-1; k >= partY; k--) {
131 component.setPixel(x, k, color.rgba());
134 if (unscaled && size.width() >= component.width()) {
137 return component.scaled(size, Qt::IgnoreAspectRatio, Qt::FastTransformation);
141 void HistogramGenerator::drawComponentFull(QPainter *davinci, const int *y, const float &scaling, const QRect &rect,
142 const QColor &color, const int &textSpace, const bool &unscaled) const
144 QImage component = drawComponent(y, rect.size() - QSize(0, textSpace), scaling, color, unscaled);
145 davinci->drawImage(rect.topLeft(), component);
148 for (int x = 0; x < 256; x++) {
155 for (int x = 255; x >= 0; x--) {
162 const int textY = rect.bottom()-textSpace+15;
164 const int cw = component.width();
166 davinci->drawText(0, textY, "min");
167 davinci->drawText(dist, textY, QString::number(min, 'f', 0));
169 davinci->drawText(cw-dist-30, textY, "max");
170 davinci->drawText(cw-30, textY, QString::number(max, 'f', 0));