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);
25 const uchar RGBParadeGenerator::distRight(40);
26 const uchar RGBParadeGenerator::distBottom(40);
28 RGBParadeGenerator::RGBParadeGenerator()
32 QImage RGBParadeGenerator::calculateRGBParade(const QSize ¶deSize, const QImage &image,
33 const RGBParadeGenerator::PaintMode paintMode, const bool &drawAxis,
34 const bool &drawGradientRef, const uint &accelFactor)
36 Q_ASSERT(accelFactor >= 1);
38 if (paradeSize.width() <= 0 || paradeSize.height() <= 0 || image.width() <= 0 || image.height() <= 0) {
42 QImage parade(paradeSize, QImage::Format_ARGB32);
43 parade.fill(qRgba(0,0,0,0));
48 QPainter davinci(¶de);
52 const uint ww = paradeSize.width();
53 const uint wh = paradeSize.height();
54 const uint iw = image.bytesPerLine();
55 const uint ih = image.height();
56 const uint byteCount = iw*ih;
58 const uchar offset = 10;
59 const int partW = (ww - 2*offset - distRight) / 3;
60 const int partH = wh - distBottom;
62 // To get constant brightness, independant of acceleration factor and input image size
63 // Must be a float because the acceleration factor can be high, leading to <1 expected px per px.
64 // Divide by 3 because of the 3 components.
65 const float brightnessAdjustment = accelFactor * ((float) ww*wh/(byteCount>>3)) / 3;
67 uchar minR = 255, minG = 255, minB = 255, maxR = 0, maxG = 0, maxB = 0, r, g, b;
68 // qDebug() << "Expecting about " << avgPxPerPx << " pixels per pixel in the RGB parade. Weakening by " << weaken
69 // << " with an acceleration factor of " << accelFactor;
72 QImage unscaled(ww-distRight, 256, QImage::Format_ARGB32);
73 unscaled.fill(qRgba(0, 0, 0, 0));
75 const float wPrediv = (float)(partW-1)/(iw-1);
77 const uchar *bits = image.bits();
78 const uint stepsize = 4*accelFactor;
80 for (uint i = 0, x = 0; i < byteCount; i += stepsize) {
89 paradePoint = QPoint((int)dx, r);
90 paradeCol = QRgb(unscaled.pixel(paradePoint));
93 unscaled.setPixel(paradePoint, qRgba(255,10,10, CHOP255(brightnessAdjustment*16 + qAlpha(paradeCol))));
96 unscaled.setPixel(paradePoint, qRgba(255,255,255, CHOP255(brightnessAdjustment*16 + qAlpha(paradeCol))));
100 paradePoint = QPoint((int) (dx + partW + offset), g);
101 paradeCol = QRgb(unscaled.pixel(paradePoint));
104 unscaled.setPixel(paradePoint, qRgba(10,255,10, CHOP255(brightnessAdjustment*16 + qAlpha(paradeCol))));
107 unscaled.setPixel(paradePoint, qRgba(255,255,255, CHOP255(brightnessAdjustment*16 + qAlpha(paradeCol))));
111 paradePoint = QPoint((int) (dx + 2*partW + 2*offset), b);
112 paradeCol = QRgb(unscaled.pixel(paradePoint));
115 unscaled.setPixel(paradePoint, qRgba(10,10,255, CHOP255(brightnessAdjustment*16 + qAlpha(paradeCol))));
118 unscaled.setPixel(paradePoint, qRgba(255,255,255, CHOP255(brightnessAdjustment*16 + qAlpha(paradeCol))));
123 if (r < minR) { minR = r; }
124 if (g < minG) { minG = g; }
125 if (b < minB) { minB = b; }
126 if (r > maxR) { maxR = r; }
127 if (g > maxG) { maxG = g; }
128 if (b > maxB) { maxB = b; }
132 x %= iw; // Modulo image width, to represent the current x position in the image
134 // Scale the image to the target height. Scaling is not accomplished before because
135 // there are only 255 different values which would lead to gaps if the height is not exactly 255.
136 // Don't use bilinear transformation because the fast transformation meets the goal better.
137 davinci.drawImage(0, 0, unscaled.mirrored(false, true).scaled(unscaled.width(), partH, Qt::IgnoreAspectRatio, Qt::FastTransformation));
141 for (uint i = 0; i <= 10; i++) {
142 dy = (float)i/10 * (partH-1);
143 for (uint x = 0; x < ww-distRight; x++) {
144 opx = parade.pixel(x, dy);
145 parade.setPixel(x,dy, qRgba(CHOP255(150+qRed(opx)), 255,
146 CHOP255(200+qBlue(opx)), CHOP255(32+qAlpha(opx))));
151 if (drawGradientRef) {
152 davinci.setPen(colLight);
153 davinci.drawLine(0 ,partH, partW, 0);
154 davinci.drawLine( partW + offset,partH, 2*partW + offset,0);
155 davinci.drawLine(2*partW + 2*offset,partH, 3*partW + 2*offset,0);
161 // Show numerical minimum
162 if (minR == 0) { davinci.setPen(colHighlight); } else { davinci.setPen(colSoft); }
163 davinci.drawText(0, wh, "min: ");
164 if (minG == 0) { davinci.setPen(colHighlight); } else { davinci.setPen(colSoft); }
165 davinci.drawText(partW + offset, wh, "min: ");
166 if (minB == 0) { davinci.setPen(colHighlight); } else { davinci.setPen(colSoft); }
167 davinci.drawText(2*partW + 2*offset, wh, "min: ");
169 // Show numerical maximum
170 if (maxR == 255) { davinci.setPen(colHighlight); } else { davinci.setPen(colSoft); }
171 davinci.drawText(0, wh-20, "max: ");
172 if (maxG == 255) { davinci.setPen(colHighlight); } else { davinci.setPen(colSoft); }
173 davinci.drawText(partW + offset, wh-20, "max: ");
174 if (maxB == 255) { davinci.setPen(colHighlight); } else { davinci.setPen(colSoft); }
175 davinci.drawText(2*partW + 2*offset, wh-20, "max: ");
177 davinci.setPen(colLight);
178 davinci.drawText(d, wh, QString::number(minR, 'f', 0));
179 davinci.drawText(partW + offset + d, wh, QString::number(minG, 'f', 0));
180 davinci.drawText(2*partW + 2*offset + d, wh, QString::number(minB, 'f', 0));
182 davinci.drawText(d, wh-20, QString::number(maxR, 'f', 0));
183 davinci.drawText(partW + offset + d, wh-20, QString::number(maxG, 'f', 0));
184 davinci.drawText(2*partW + 2*offset + d, wh-20, QString::number(maxB, 'f', 0));
186 davinci.drawText(ww-distRight+5, 10, "255");
187 davinci.drawText(ww-distRight+5, partH+5, "0");