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 ***************************************************************************/
11 #include "rgbparadegenerator.h"
18 #define CHOP255(a) ((255) < (a) ? (255) : (a))
20 const QColor RGBParadeGenerator::colHighlight(255, 245, 235, 255);
21 const QColor RGBParadeGenerator::colLight(200, 200, 200, 255);
22 const QColor RGBParadeGenerator::colSoft(150, 150, 150, 255);
24 RGBParadeGenerator::RGBParadeGenerator()
28 QImage RGBParadeGenerator::calculateRGBParade(const QSize ¶deSize, const QImage &image,
29 const RGBParadeGenerator::PaintMode paintMode, const bool &drawAxis,
30 const bool &drawGradientRef, const uint &accelFactor)
32 Q_ASSERT(accelFactor >= 1);
34 if (paradeSize.width() <= 0 || paradeSize.height() <= 0 || image.width() <= 0 || image.height() <= 0) {
38 QImage parade(paradeSize, QImage::Format_ARGB32);
39 parade.fill(qRgba(0,0,0,0));
44 QPainter davinci(¶de);
48 const uint ww = paradeSize.width();
49 const uint wh = paradeSize.height();
50 const uint iw = image.bytesPerLine();
51 const uint ih = image.height();
52 const uint byteCount = iw*ih;
54 const uchar offset = 10;
55 const uchar right = 40;
56 const uchar bottom = 40;
57 const int partW = (ww - 2*offset - right) / 3;
58 const int partH = wh - bottom;
60 // To get constant brightness, independant of acceleration factor and input image size
61 // Must be a float because the acceleration factor can be high, leading to <1 expected px per px.
62 const float avgPxPerPx = ((float)(image.width() * image.height()) / (500*partW*accelFactor));
63 const float weaken = (avgPxPerPx == 0) ? 1 : (float)4/avgPxPerPx;
64 const int vh = weaken*27;
65 const int vm = weaken*18;
66 const int vl = weaken*9;
68 // Divide by 3 because of the 3 components
69 const float brightnessAdjustment = accelFactor * ((float) ww*wh/(byteCount>>3)) / 3;
71 uchar minR = 255, minG = 255, minB = 255, maxR = 0, maxG = 0, maxB = 0, r, g, b;
72 // qDebug() << "Expecting about " << avgPxPerPx << " pixels per pixel in the RGB parade. Weakening by " << weaken
73 // << " with an acceleration factor of " << accelFactor;
76 QImage unscaled(ww-right, 256, QImage::Format_ARGB32);
77 unscaled.fill(qRgba(0, 0, 0, 0));
79 const float wPrediv = (float)(partW-1)/(iw-1);
81 const uchar *bits = image.bits();
82 const uint stepsize = 4*accelFactor;
84 for (uint i = 0, x = 0; i < byteCount; i += stepsize) {
93 paradePoint = QPoint((int)dx, r);
94 paradeCol = QRgb(unscaled.pixel(paradePoint));
97 unscaled.setPixel(paradePoint, qRgba(CHOP255(vh + qRed(paradeCol)), CHOP255(vm + qGreen(paradeCol)),
98 CHOP255(vl + qBlue(paradeCol)), 255));
101 unscaled.setPixel(paradePoint, qRgba(255,0,0, CHOP255(brightnessAdjustment*16 + qAlpha(paradeCol))));
105 paradePoint = QPoint((int) (dx + partW + offset), g);
106 paradeCol = QRgb(unscaled.pixel(paradePoint));
109 unscaled.setPixel(paradePoint, qRgba(CHOP255(vl + qRed(paradeCol)), CHOP255(vh + qGreen(paradeCol)),
110 CHOP255(vm + qBlue(paradeCol)), 255));
113 unscaled.setPixel(paradePoint, qRgba(0,255,0, CHOP255(brightnessAdjustment*16 + qAlpha(paradeCol))));
117 paradePoint = QPoint((int) (dx + 2*partW + 2*offset), b);
118 paradeCol = QRgb(unscaled.pixel(paradePoint));
121 unscaled.setPixel(paradePoint, qRgba(CHOP255(vm + qRed(paradeCol)), CHOP255(vl + qGreen(paradeCol)),
122 CHOP255(vh + qBlue(paradeCol)), 255));
125 unscaled.setPixel(paradePoint, qRgba(0,0,255, CHOP255(brightnessAdjustment*16 + qAlpha(paradeCol))));
130 if (r < minR) { minR = r; }
131 if (g < minG) { minG = g; }
132 if (b < minB) { minB = b; }
133 if (r > maxR) { maxR = r; }
134 if (g > maxG) { maxG = g; }
135 if (b > maxB) { maxB = b; }
139 x %= iw; // Modulo image width, to represent the current x position in the image
141 // Scale the image to the target height. Scaling is not accomplished before because
142 // there are only 255 different values which would lead to gaps if the height is not exactly 255.
143 // Don't use bilinear transformation because the fast transformation meets the goal better.
144 davinci.drawImage(0, 0, unscaled.mirrored(false, true).scaled(unscaled.width(), partH, Qt::IgnoreAspectRatio, Qt::FastTransformation));
148 for (uint i = 0; i <= 10; i++) {
149 dy = (float)i/10 * (partH-1);
150 for (uint x = 0; x < ww-right; x++) {
151 opx = parade.pixel(x, dy);
152 parade.setPixel(x,dy, qRgba(CHOP255(150+qRed(opx)), 255,
153 CHOP255(200+qBlue(opx)), CHOP255(32+qAlpha(opx))));
158 if (drawGradientRef) {
159 davinci.setPen(colLight);
160 davinci.drawLine(0 ,partH, partW, 0);
161 davinci.drawLine( partW + offset,partH, 2*partW + offset,0);
162 davinci.drawLine(2*partW + 2*offset,partH, 3*partW + 2*offset,0);
168 // Show numerical minimum
169 if (minR == 0) { davinci.setPen(colHighlight); } else { davinci.setPen(colSoft); }
170 davinci.drawText(0, wh, "min: ");
171 if (minG == 0) { davinci.setPen(colHighlight); } else { davinci.setPen(colSoft); }
172 davinci.drawText(partW + offset, wh, "min: ");
173 if (minB == 0) { davinci.setPen(colHighlight); } else { davinci.setPen(colSoft); }
174 davinci.drawText(2*partW + 2*offset, wh, "min: ");
176 // Show numerical maximum
177 if (maxR == 255) { davinci.setPen(colHighlight); } else { davinci.setPen(colSoft); }
178 davinci.drawText(0, wh-20, "max: ");
179 if (maxG == 255) { davinci.setPen(colHighlight); } else { davinci.setPen(colSoft); }
180 davinci.drawText(partW + offset, wh-20, "max: ");
181 if (maxB == 255) { davinci.setPen(colHighlight); } else { davinci.setPen(colSoft); }
182 davinci.drawText(2*partW + 2*offset, wh-20, "max: ");
184 davinci.setPen(colLight);
185 davinci.drawText(d, wh, QString::number(minR, 'f', 0));
186 davinci.drawText(partW + offset + d, wh, QString::number(minG, 'f', 0));
187 davinci.drawText(2*partW + 2*offset + d, wh, QString::number(minB, 'f', 0));
189 davinci.drawText(d, wh-20, QString::number(maxR, 'f', 0));
190 davinci.drawText(partW + offset + d, wh-20, QString::number(maxG, 'f', 0));
191 davinci.drawText(2*partW + 2*offset + d, wh-20, QString::number(maxB, 'f', 0));
193 davinci.drawText(ww-right+5, 10, "255");
194 davinci.drawText(ww-right+5, partH+5, "0");