File indexing completed on 2024-04-21 04:52:29

 /*
     SPDX-FileCopyrightText: 2010 Simon Andreas Eugster <simon.eu@gmail.com>
 
     SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 */
 
 #pragma once
 
 #include <QImage>
 #include <QObject>
 
 /** @class ColorTools
     @brief \@todo Describe class ColorTools
     @todo Describe class ColorTools
  */
 class ColorTools : public QObject
 {
     Q_OBJECT
 
 public:
     explicit ColorTools(QObject *parent = nullptr);
 
     // enum ColorsRGB { COL_R, COL_G, COL_B, COL_Luma, COL_A, COL_RGB };
     enum class ColorsRGB { R, G, B, Luma, A, RGB };
 
     enum ComponentsHSV { COM_H, COM_S, COM_V };
 
     /**
      * @brief Draws a UV plane with given Y value.
      * scaling defines how far to zoom in (or out). Lower value = zoom in.
      * The modified version always scales the RGB values so that at least one of them attains 255.
      * If not the full rect should be filled, set circleOnly to true.
      * See also: https://en.wikipedia.org/wiki/YUV and https://de.wikipedia.org/wiki/Vektorskop
      */
     QImage yuvColorWheel(const QSize &size, int Y, float scaling, bool modifiedVersion, bool circleOnly);
     /**
      * @brief Draws a UV plane with given UV angle (ratio u:v stays constant)
      * scaling defines how far to zoom in (or out). Lower value = zoom in.
      * angle defines the angle in a default U/V plane. A vertical plane, on which Y goes from 0 to 1,
      * is then laid through the UV plane, with the defined angle.
      * @see yuvColorWheel()
      */
     QImage yuvVerticalPlane(const QSize &size, int angle, float scaling);
     /**
      * @brief Draws a RGB plane with two values on one axis and one on the other.
      * This is e.g. useful as background for a curves dialog. On the line from bottom left to top right
      * are neutral colors. The colors on the y axis show what the neutral color will look like when modifying the curve.
      * color defines the color to modify on the y axis. The other two components will be increased
      * in equal terms (linear as well) on the x axis.
      * scaling \in ]0,1] defines the maximum variance of the selected component; Choosing a value lower than 1
      * simulates the case that the curves can adjust only +- scaling*255. This mainly delivers a more constant look
      * when also using the Luma component for the curves display but might not represent the actual color change!
      */
     static QImage rgbCurvePlane(const QSize &size, const ColorTools::ColorsRGB &color, float scaling = 1, const QRgb &background = QRgb());
 
     /**
        Same as the plane except that we vary only the vertical dimension
     */
     static QImage rgbCurveLine(const QSize &size, const ColorTools::ColorsRGB &color, const QRgb &background);
     /**
      * @brief Draws a YPbPr plane with Pb on the x axis and Pr on the y axis.
      * Y is the Y value to use.
      * scaling defines how far to zoom in (or out). Lower value = zoom in.
      * See also: https://de.wikipedia.org/wiki/YPbPr-Farbmodell and https://www.poynton.com/ColorFAQ.html
      */
     QImage yPbPrColorWheel(const QSize &size, int Y, float scaling, bool circleOnly);
     /**
      * @brief Draws a HSV plane with Hue on the x axis and hue difference on the y axis.
      * This is for the Bézier Curves widget which allows one to change the hue (y) of a certain hue.
      * MIN/MAX give the minimum/maximum hue difference, e.g. -128,+128.
      * For the value ranges see:
      * https://doc.qt.io/qt-5/qcolor.html#the-hsv-color-model
      */
     static QImage hsvHueShiftPlane(const QSize &size, int S, int V, int MIN, int MAX);
 
     /**
       Basic HSV plane with two components varying on the x and y axis.
       If both components are the same, then the y axis will be considered.
       MIN/MAX give the minimum/maximum saturation, usually 0..255.
       Missing colour components will be taken from baseColor.
       For shear == true, the image will be sheared such that the x axis goes through (0,0) and (1,1). offsetY can additionally
       shift the whole x axis vertically.
       */
     static QImage hsvCurvePlane(const QSize &size, const QColor &baseColor, const ComponentsHSV &xVariant, const ComponentsHSV &yVariant, bool shear = false,
                                 const float offsetY = 0);
 
 Q_SIGNALS:
     void signalYuvWheelCalculationFinished();
 };