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/* This file is part of the KDE libraries
Copyright (C) 1998, 1999 Christian Tibirna <ctibirna@total.net>
(C) 1998, 1999 Daniel M. Duley <mosfet@kde.org>
(C) 1998, 1999 Dirk Mueller <mueller@kde.org>
*/
// $Id$
#ifndef __KPIXMAP_EFFECT_H
#define __KPIXMAP_EFFECT_H
#include <kdelibs_export.h>
#include <qsize.h>
class KPixmap;
class QColor;
/**
* 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 KDEFX_EXPORT KPixmapEffect
{
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 KPixmap& gradient(KPixmap& 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 KPixmap& unbalancedGradient(KPixmap& 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 KPixmap createTiled(const KPixmap& 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 pixmap(), provided for convenience.
*/
static KPixmap& intensity(KPixmap& 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 pixmap(), provided for convenience.
*/
static KPixmap& channelIntensity(KPixmap& 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).
* @param ncols The number of colors to dither the pixmap to. Only
* used for 8 bpp pixmaps.
* @return Returns the pixmap(), provided for convenience.
*/
static KPixmap& blend(KPixmap& 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.
* @param ncols The number of colors to dither the pixmap to.
* Only used for 8 bpp pixmaps.
* @return Returns The pixmap(), provided for convenience.
*/
static KPixmap& hash(KPixmap& 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.
* Doesn't change the original pixmap.
*
* @param pixmap The pixmap to process.
* @param size The size of the returned pixmap. If @p size is larger than
* the original, the resulting pixmap will be tiled.
* @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 resulting pixmap.
*/
static KPixmap pattern(const KPixmap& 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 pixmap(), provided for convenience.
*/
static KPixmap& fade(KPixmap& 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 pixmap(), provided for convenience.
*/
static KPixmap& toGray(KPixmap& 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 pixmap(), provided for convenience.
*/
static KPixmap& desaturate(KPixmap& 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 pixmap(), provided for convenience.
*/
static KPixmap& contrast(KPixmap& 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 pixmap(), provided for convenience.
*/
static KPixmap& dither(KPixmap &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 KPixmap selectedPixmap( const KPixmap &pixmap, const QColor &col );
};
#endif
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