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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 {
// Constants related to kLowPalFormat
#define kLowPalBytesPerColor 2
#define kLowPalNumColors 16
#define kLowPalNumBytes ((kLowPalNumColors) * (kLowPalBytesPerColor))
/*! \brief Low resolution (9-bit) color format used in Cine's 16-color modes. */
static const Graphics::PixelFormat kLowPalFormat(kLowPalBytesPerColor, 3, 3, 3, 0, 8, 4, 0, 0);
// Constants related to kHighPalFormat
#define kHighPalBytesPerColor 3
#define kHighPalNumColors 256
#define kHighPalNumBytes ((kHighPalNumColors) * (kHighPalBytesPerColor))
/*! \brief High resolution (24-bit) color format used in Cine's 256-color modes. */
static const Graphics::PixelFormat kHighPalFormat(kHighPalBytesPerColor, 8, 8, 8, 0, 0, 8, 16, 0);
/*! \brief The color format used by OSystem's setPalette-function. */
static const Graphics::PixelFormat kSystemPalFormat(4, 8, 8, 8, 0, 0, 8, 16, 0);
/*! \brief 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];
};
extern Common::Array<PalEntry> palArray;
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;
};
/*! \brief 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);
/*! \brief 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();
/*! \brief 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);
/*! \brief 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;
/*! \brief 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;
/*! \brief 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;
/*! \brief 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;
/*! \brief 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;
/*! \brief 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();
/*! \brief Is the palette valid? (Mostly just checks the color format for correctness) */
bool isValid() const;
/*! \brief The original color format in which this palette was loaded. */
const Graphics::PixelFormat &colorFormat() const;
/*! \brief Sets current palette to global OSystem's palette using g_system->setPalette. */
void setGlobalOSystemPalette() const;
/*! \brief Get the color at the given palette index. */
Color getColor(byte index) const;
/*! \brief Get the red color component of the color at the given palette index. */
uint8 getR(byte index) const;
/*! \brief Get the green color component of the color at the given palette index. */
uint8 getG(byte index) const;
/*! \brief 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);
Cine::Palette::Color saturatedAddColor(Cine::Palette::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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