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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#ifndef CINE_PAL_H
#define CINE_PAL_H
#include "graphics/pixelformat.h"
namespace Cine {
/**
* Endian types. Used at least by Palette class's load and save functions.
* TODO: Move somewhere more general as this is definitely not Cine-engine specific
*
* NOTE: It seems LITTLE_ENDIAN and/or BIG_ENDIAN were defined already on some platforms so
* therefore renamed the enumerations to something not clashing by giving them "CINE_"-prefixes.
*/
enum EndianType {
CINE_NATIVE_ENDIAN,
CINE_LITTLE_ENDIAN,
CINE_BIG_ENDIAN
};
struct PalEntry {
char name[10];
byte pal1[16];
byte pal2[16];
};
void loadPal(const char *fileName);
void loadRelatedPalette(const char *fileName);
/**
* A class for handling Cine-engine's palettes.
* TODO: Test a bit more
*/
class Palette {
public:
struct Color {
uint8 r, g, b;
};
/**
* Create an initially black palette with the given color format and number of colors.
* @param format Color format
* @param numColors Number of colors
* @note For the default constructed object (i.e. no parameters given) this will hold: empty() && !isValid()
*/
Palette(const Graphics::PixelFormat format = Graphics::PixelFormat(), const uint numColors = 0);
/**
* Clear the palette (Set color count to zero, release memory, overwrite color format with default value).
* @note This is very different from using fillWithBlack-function which fills the palette with black.
*/
Palette &clear();
/**
* Load palette from buffer with given color format, endianness and number of colors.
* @param buf Input buffer
* @param size Input buffer size in bytes
* @param format Input color format
* @param numColors Number of colors to load
* @param endian The endianness of the colors in the input buffer
*/
Palette &load(const byte *buf, const uint size, const Graphics::PixelFormat format, const uint numColors, const EndianType endian);
/**
* Save the whole palette to buffer in original color format using defined endianness.
* @param buf Output buffer
* @param size Output buffer size in bytes
* @param endian The endian type to use
*/
byte *save(byte *buf, const uint size, const EndianType endian) const;
/**
* Save the whole palette to buffer in given color format using defined endianness.
* @param buf Output buffer
* @param size Output buffer size in bytes
* @param format Output color format
* @param endian The endian type to use
*/
byte *save(byte *buf, const uint size, const Graphics::PixelFormat format, const EndianType endian) const;
/**
* Save (partial) palette to buffer in given color format using defined endianness.
* @param buf Output buffer
* @param size Output buffer size in bytes
* @param format Output color format
* @param numColors Number of colors to save
* @param endian The endian type to use
* @param firstIndex Starting color index (from which onwards to save the colors)
*/
byte *save(byte *buf, const uint size, const Graphics::PixelFormat format, const uint numColors, const EndianType endian, const byte firstIndex = 0) const;
/**
* Rotate the palette in color range [firstIndex, lastIndex] to the right by the specified rotation amount.
* @param rotationAmount Amount to rotate the sub-palette to the right. Only values 0 and 1 are currently supported!
*/
Palette &rotateRight(byte firstIndex, byte lastIndex, signed rotationAmount = 1);
Palette &saturatedAddColor(Palette &output, byte firstIndex, byte lastIndex, signed r, signed g, signed b) const;
/**
* Saturated add an RGB color in given color format to current palette's subset and save the modified colors in the given output palette.
* @param output The output palette (Only this palette is modified)
* @param firstIndex First color index of the palette's subset (Inclusive range)
* @param lastIndex Last color index of the palette's subset (Inclusive range)
* @param rSource The red color component in the source color format
* @param gSource The green color component in the source color format
* @param bSource The blue color component in the source color format
* @param sourceFormat The source color format (i.e. the color format of the given RGB color)
* @note This function basically converts the given color to the palette's internal color format
* and adds that using the normal saturatedAddColor-function.
*/
Palette &saturatedAddColor(Palette &output, byte firstIndex, byte lastIndex, signed rSource, signed gSource, signed bSource, const Graphics::PixelFormat &sourceFormat) const;
/**
* Saturated add a normalized gray value to current palette's subset and save the modified colors in the given output palette.
* @param output The output palette (Only this palette is modified)
* @param firstIndex First color index of the palette's subset (Inclusive range)
* @param lastIndex Last color index of the palette's subset (Inclusive range)
* @param grayDividend Dividend of the normalized gray value
* @param grayDenominator Denominator of the normalized gray value
* @note The normalized gray value (i.e. in range [-1, +1]) is given as a fractional number
* (i.e. the normalized gray value is calculated by dividing grayDividend by grayDenominator).
*/
Palette &saturatedAddNormalizedGray(Palette &output, byte firstIndex, byte lastIndex, signed grayDividend, signed grayDenominator) const;
bool empty() const;
uint colorCount() const;
Palette &fillWithBlack();
/** Is the palette valid? (Mostly just checks the color format for correctness) */
bool isValid() const;
/** The original color format in which this palette was loaded. */
const Graphics::PixelFormat &colorFormat() const;
/** Sets current palette to global OSystem's palette using g_system->getPaletteManager()->setPalette. */
void setGlobalOSystemPalette() const;
/** Get the color at the given palette index. */
Color getColor(byte index) const;
/** Get the red color component of the color at the given palette index. */
uint8 getR(byte index) const;
/** Get the green color component of the color at the given palette index. */
uint8 getG(byte index) const;
/** Get the blue color component of the color at the given palette index. */
uint8 getB(byte index) const;
private:
void setColorFormat(const Graphics::PixelFormat format);
// WORKAROUND: Using a reference to a result here instead of returning an Color object.
// This is needed because when using a Color as return value, this would crash Chrilith's
// compiler for PalmOS.
// TODO: Add more information about the compiler.
void saturatedAddColor(Color &result, const Color &baseColor, signed r, signed g, signed b) const;
private:
Graphics::PixelFormat _format; ///< The used source color format
Common::Array<Color> _colors; ///< The actual palette data
};
} // End of namespace Cine
#endif
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