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
  25 const uchar RGBParadeGenerator::distRight(40);
  26 const uchar RGBParadeGenerator::distBottom(40);
  27
  28 RGBParadeGenerator::RGBParadeGenerator()
  29 {
  30 }
  31
  32 QImage RGBParadeGenerator::calculateRGBParade(const QSize &paradeSize, const QImage &image,
  33                                               const RGBParadeGenerator::PaintMode paintMode, const bool &drawAxis,
  34                                               const bool &drawGradientRef, const uint &accelFactor)
  35 {
  36     Q_ASSERT(accelFactor >= 1);
  37
  38     if (paradeSize.width() <= 0 || paradeSize.height() <= 0 || image.width() <= 0 || image.height() <= 0) {
  39         return QImage();
  40
  41     } else {
  42         QImage parade(paradeSize, QImage::Format_ARGB32);
  43         parade.fill(qRgba(0,0,0,0));
  44
  45         QRgb *col;
  46         QRgb paradeCol;
  47         QPoint paradePoint;
  48         QPainter davinci(&parade);
  49
  50         double dx, dy;
  51
  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;
  57
  58         const uchar offset = 10;
  59         const int partW = (ww - 2*offset - distRight) / 3;
  60         const int partH = wh - distBottom;
  61
  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;
  66
  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;
  70
  71
  72         QImage unscaled(ww-distRight, 256, QImage::Format_ARGB32);
  73         unscaled.fill(qRgba(0, 0, 0, 0));
  74
  75         const float wPrediv = (float)(partW-1)/(iw-1);
  76
  77         const uchar *bits = image.bits();
  78         const uint stepsize = 4*accelFactor;
  79
  80         for (uint i = 0, x = 0; i < byteCount; i += stepsize) {
  81
  82             col = (QRgb *)bits;
  83             r = qRed(*col);
  84             g = qGreen(*col);
  85             b = qBlue(*col);
  86
  87             dx = x*wPrediv;
  88
  89             paradePoint = QPoint((int)dx, r);
  90             paradeCol = QRgb(unscaled.pixel(paradePoint));
  91             switch(paintMode) {
  92             case PaintMode_RGB:
  93                 unscaled.setPixel(paradePoint, qRgba(255,10,10, CHOP255(brightnessAdjustment*16 + qAlpha(paradeCol))));
  94                 break;
  95             default:
  96                 unscaled.setPixel(paradePoint, qRgba(255,255,255, CHOP255(brightnessAdjustment*16 + qAlpha(paradeCol))));
  97                 break;
  98             }
  99
 100             paradePoint = QPoint((int) (dx + partW + offset), g);
 101             paradeCol = QRgb(unscaled.pixel(paradePoint));
 102             switch(paintMode) {
 103             case PaintMode_RGB:
 104                 unscaled.setPixel(paradePoint, qRgba(10,255,10, CHOP255(brightnessAdjustment*16 + qAlpha(paradeCol))));
 105                 break;
 106             default:
 107                 unscaled.setPixel(paradePoint, qRgba(255,255,255, CHOP255(brightnessAdjustment*16 + qAlpha(paradeCol))));
 108                 break;
 109             }
 110
 111             paradePoint = QPoint((int) (dx + 2*partW + 2*offset), b);
 112             paradeCol = QRgb(unscaled.pixel(paradePoint));
 113             switch(paintMode) {
 114             case PaintMode_RGB:
 115                 unscaled.setPixel(paradePoint, qRgba(10,10,255, CHOP255(brightnessAdjustment*16 + qAlpha(paradeCol))));
 116                 break;
 117             default:
 118                 unscaled.setPixel(paradePoint, qRgba(255,255,255, CHOP255(brightnessAdjustment*16 + qAlpha(paradeCol))));
 119                 break;
 120             }
 121
 122
 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; }
 129
 130             bits += stepsize;
 131             x += stepsize;
 132             x %= iw; // Modulo image width, to represent the current x position in the image
 133         }
 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));
 138
 139         if (drawAxis) {
 140             QRgb opx;
 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))));
 147                 }
 148             }
 149         }
 150
 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);
 156         }
 157
 158
 159         const int d = 50;
 160
 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: ");
 168
 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: ");
 176
 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));
 181
 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));
 185
 186         davinci.drawText(ww-distRight+5,            10,      "255");
 187         davinci.drawText(ww-distRight+5,            partH+5,  "0");
 188
 189
 190
 191         return parade;
 192     }
 193 }
 194
 195 #undef CHOP255