/* This file is part of the KDE libraries Copyright (C) 1998, 1999 Christian Tibirna (C) 1998, 1999 Daniel M. Duley (C) 1998, 1999 Dirk A. Mueller */ // $Id$ #ifndef __OPIXMAP_EFFECT_H #define __OPIXMAP_EFFECT_H #include typedef QPixmap OPixmap; class QColor; namespace Opie { namespace Ui { /** * This class includes various pixmap-based graphical effects. * * Everything is * static, so there is no need to create an instance of this class. You can * just call the static methods. They are encapsulated here merely to provide * a common namespace. */ class OPixmapEffect { public: enum GradientType { VerticalGradient, HorizontalGradient, DiagonalGradient, CrossDiagonalGradient, PyramidGradient, RectangleGradient, PipeCrossGradient, EllipticGradient }; enum RGBComponent { Red, Green, Blue }; enum Lighting {NorthLite, NWLite, WestLite, SWLite, SouthLite, SELite, EastLite, NELite}; /** * Creates a gradient from color a to color b of the specified type. * * @param pixmap The pixmap to process. * @param ca Color a. * @param cb Color b. * @param type The type of gradient. * @param ncols The number of colors to use when not running on a * truecolor display. The gradient will be dithered to this number of * colors. Pass 0 to prevent dithering. * @return Returns the generated pixmap, for convenience. */ static OPixmap& gradient(OPixmap& pixmap, const QColor &ca, const QColor &cb, GradientType type, int ncols=3); /** * Creates an unbalanced gradient. * * An unbalanced gradient is a gradient where the transition from * color a to color b is not linear, but in this case, exponential. * * @param pixmap The pixmap that should be written. * @param ca Color a. * @param cb Color b. * @param type The type of gradient. * @param xfactor The x decay length. Use a value between -200 and 200. * @param yfactor The y decay length. * @param ncols The number of colors. See #gradient. * @return The generated pixmap, for convencience. */ static OPixmap& unbalancedGradient(OPixmap& pixmap, const QColor &ca, const QColor &cb, GradientType type, int xfactor = 100, int yfactor = 100, int ncols=3); /** * Creates a pixmap of a given size with the given pixmap. * * if the * given size is bigger than the size of the pixmap, the pixmap is * tiled. * * @param pixmap This is the source pixmap * @param size The size the new pixmap should have. * @return The generated, tiled pixmap. */ static OPixmap createTiled(const OPixmap& pixmap, QSize size); /** * Either brightens or dims a pixmap by a specified ratio. * * @param pixmap The pixmap to process. * @param ratio The ratio to use. Use negative value to dim. * @return Returns The @ref pixmap(), provided for convenience. */ static OPixmap& intensity(OPixmap& pixmap, float ratio); /** * Modifies the intensity of a pixmap's RGB channel component. * * @param pixmap The pixmap to process. * @param ratio value. Use negative value to dim. * @param channel Which channel(s) should be modified * @return Returns the @ref pixmap(), provided for convenience. */ static OPixmap& channelIntensity(OPixmap& pixmap, float ratio, RGBComponent channel); /** * Blends the provided pixmap into a background of the indicated color. * * @param pixmap The pixmap to process. * @param initial_intensity this parameter takes values from -1 to 1: * @li If positive, it tells how much to fade the image in its * less affected spot. * @li If negative, it tells roughly indicates how much of the image * remains unaffected * @param bgnd Indicates the color of the background to blend in. * @param eff Lets you choose what kind of blending you like. * @param anti_dir Blend in the opposite direction (makes no much sense * with concentric blending effects). * @return Returns the @ref pixmap(), provided for convenience. */ static OPixmap& blend(OPixmap& pixmap, float initial_intensity, const QColor &bgnd, GradientType eff, bool anti_dir=false, int ncols=3); /** * Builds a hash on any given pixmap. * * @param pixmap The pixmap to process. * @param lite The hash faces the indicated lighting (cardinal poles) * @param spacing How many unmodified pixels inbetween hashes. * @return Returns The @ref pixmap(), provided for convenience. */ static OPixmap& hash(OPixmap& pixmap, Lighting lite=NorthLite, unsigned int spacing=0, int ncols=3); /** * Creates a pattern from a pixmap. * * The given pixmap is "flattened" * between color a to color b. * * @param pixmap The pixmap to process. * @param ca Color a. * @param cb Color b. * @param ncols The number of colors to use. The image will be * dithered to this depth. Pass zero to prevent dithering. * @return The @ref pixmap(), provided for convenience. */ static OPixmap pattern(const OPixmap& pixmap, QSize size, const QColor &ca, const QColor &cb, int ncols=8); /** * Fades a pixmap to a certain color. * * @param pixmap The pixmap to process. * @param val The strength of the effect. 0 <= val <= 1. * @param color The color to blend to. * @return Returns the @ref pixmap(), provided for convenience. */ static OPixmap& fade(OPixmap& pixmap, double val, const QColor &color); /** * Converts a pixmap to grayscale. * * @param pixmap The pixmap to process. * @param fast Set to @p true in order to use a faster but non-photographic * quality algorithm. Appropriate for things such as toolbar icons. * @return Returns the @ref pixmap(), provided for convenience. */ static OPixmap& toGray(OPixmap& pixmap, bool fast=false); /** * Desaturates a pixmap. * * @param pixmap The pixmap to process. * @param desat A value between 0 and 1 setting the degree of desaturation * @return Returns The @ref pixmap(), provided for convenience. */ static OPixmap& desaturate(OPixmap& pixmap, float desat = 0.3); /** * Modifies the contrast of a pixmap. * * @param pixmap The pixmap to process. * @param c A contrast value between -255 and 255. * @return Returns the @ref pixmap(), provided for convenience. */ static OPixmap& contrast(OPixmap& pixmap, int c); /** * Dithers a pixmap using Floyd-Steinberg dithering for low-color * situations. * * @param pixmap The pixmap to process. * @param palette The color palette to use. * @param size The size of the palette. * @return Returns the @ref pixmap(), provided for convenience. */ static OPixmap& dither(OPixmap &pixmap, const QColor *palette, int size); /** * Calculate a 'selected' pixmap, for instance a selected icon * on the desktop. * @param pixmap the pixmap to select * @param col the selected color, usually from QColorGroup::highlight(). */ static OPixmap selectedPixmap( const OPixmap &pixmap, const QColor &col ); }; } } #endif