git.sesse.net Git - kdenlive/blob - src/colorcorrection/rgbparadegenerator.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 "rgbparadegenerator.h"
  12
  13 #include <QColor>
  14 #include <QPainter>
  15 #include <QPoint>
  16 #include <QTime>
  17
  18 #define CHOP255(a) ((255) < (a) ? (255) : (a))
  19
  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);
  23
  24 RGBParadeGenerator::RGBParadeGenerator()
  25 {
  26 }
  27
  28 QImage RGBParadeGenerator::calculateRGBParade(const QSize &paradeSize, const QImage &image,
  29                                               const RGBParadeGenerator::PaintMode paintMode, const bool &drawAxis,
  30                                               const bool &drawGradientRef, const uint &accelFactor)
  31 {
  32     Q_ASSERT(accelFactor >= 1);
  33
  34     if (paradeSize.width() <= 0 || paradeSize.height() <= 0 || image.width() <= 0 || image.height() <= 0) {
  35         return QImage();
  36
  37     } else {
  38         QImage parade(paradeSize, QImage::Format_ARGB32);
  39         parade.fill(qRgba(0,0,0,0));
  40
  41         QRgb *col;
  42         QRgb paradeCol;
  43         QPoint paradePoint;
  44         QPainter davinci(&parade);
  45
  46         double dx, dy;
  47
  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;
  53
  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;
  59
  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;
  67
  68         // Divide by 3 because of the 3 components
  69         const float brightnessAdjustment = accelFactor * ((float) ww*wh/(byteCount>>3)) / 3;
  70
  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;
  74
  75
  76         QImage unscaled(ww-right, 256, QImage::Format_ARGB32);
  77         unscaled.fill(qRgba(0, 0, 0, 0));
  78
  79         const float wPrediv = (float)(partW-1)/(iw-1);
  80
  81         const uchar *bits = image.bits();
  82         const uint stepsize = 4*accelFactor;
  83
  84         for (uint i = 0, x = 0; i < byteCount; i += stepsize) {
  85
  86             col = (QRgb *)bits;
  87             r = qRed(*col);
  88             g = qGreen(*col);
  89             b = qBlue(*col);
  90
  91             dx = x*wPrediv;
  92
  93             paradePoint = QPoint((int)dx, r);
  94             paradeCol = QRgb(unscaled.pixel(paradePoint));
  95             switch(paintMode) {
  96             case PaintMode_RGB2:
  97                 unscaled.setPixel(paradePoint, qRgba(CHOP255(vh + qRed(paradeCol)), CHOP255(vm + qGreen(paradeCol)),
  98                                                      CHOP255(vl + qBlue(paradeCol)), 255));
  99                 break;
 100             default:
 101                 unscaled.setPixel(paradePoint, qRgba(255,0,0, CHOP255(brightnessAdjustment*16 + qAlpha(paradeCol))));
 102                 break;
 103             }
 104
 105             paradePoint = QPoint((int) (dx + partW + offset), g);
 106             paradeCol = QRgb(unscaled.pixel(paradePoint));
 107             switch(paintMode) {
 108             case PaintMode_RGB2:
 109                 unscaled.setPixel(paradePoint, qRgba(CHOP255(vl + qRed(paradeCol)), CHOP255(vh + qGreen(paradeCol)),
 110                                                CHOP255(vm + qBlue(paradeCol)), 255));
 111                 break;
 112             default:
 113                 unscaled.setPixel(paradePoint, qRgba(0,255,0, CHOP255(brightnessAdjustment*16 + qAlpha(paradeCol))));
 114                 break;
 115             }
 116
 117             paradePoint = QPoint((int) (dx + 2*partW + 2*offset), b);
 118             paradeCol = QRgb(unscaled.pixel(paradePoint));
 119             switch(paintMode) {
 120             case PaintMode_RGB2:
 121                 unscaled.setPixel(paradePoint, qRgba(CHOP255(vm + qRed(paradeCol)), CHOP255(vl + qGreen(paradeCol)),
 122                                                CHOP255(vh + qBlue(paradeCol)), 255));
 123                 break;
 124             default:
 125                 unscaled.setPixel(paradePoint, qRgba(0,0,255, CHOP255(brightnessAdjustment*16 + qAlpha(paradeCol))));
 126                 break;
 127             }
 128
 129
 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; }
 136
 137             bits += stepsize;
 138             x += stepsize;
 139             x %= iw; // Modulo image width, to represent the current x position in the image
 140         }
 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));
 145
 146         if (drawAxis) {
 147             QRgb opx;
 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))));
 154                 }
 155             }
 156         }
 157
 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);
 163         }
 164
 165
 166         const int d = 50;
 167
 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: ");
 175
 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: ");
 183
 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));
 188
 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));
 192
 193         davinci.drawText(ww-right+5,            10,      "255");
 194         davinci.drawText(ww-right+5,            partH+5,  "0");
 195
 196
 197
 198         return parade;
 199     }
 200 }
 201
 202 #undef CHOP255