mirror of
https://github.com/libretro/scummvm.git
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150 lines
4.5 KiB
C++
150 lines
4.5 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef GRAPHICS_PIXELFORMAT_H
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#define GRAPHICS_PIXELFORMAT_H
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#include "common/scummsys.h"
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namespace Graphics {
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/**
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* A pixel format description.
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*
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* Like ColorMasks it includes the given values to create colors from RGB
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* values and to retrieve RGB values from colors.
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*
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* Unlike ColorMasks it is not dependend on knowing the exact pixel format
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* on compile time.
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*
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* A minor difference between ColorMasks and PixelFormat is that ColorMasks
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* stores the bit count per channel in 'kFooBits', while PixelFormat stores
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* the loss compared to 8 bits per channel in '#Loss'. It also doesn't
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* contain mask values.
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*/
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struct PixelFormat {
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byte bytesPerPixel; /**< Number of bytes used in the pixel format. */
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byte rLoss, gLoss, bLoss, aLoss; /**< Precision loss of each color component. */
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byte rShift, gShift, bShift, aShift; /**< Binary left shift of each color component in the pixel value. */
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inline PixelFormat() {
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bytesPerPixel =
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rLoss = gLoss = bLoss = aLoss =
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rShift = gShift = bShift = aShift = 0;
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}
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inline PixelFormat(byte BytesPerPixel,
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byte RBits, byte GBits, byte BBits, byte ABits,
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byte RShift, byte GShift, byte BShift, byte AShift) {
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bytesPerPixel = BytesPerPixel;
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rLoss = 8 - RBits, gLoss = 8 - GBits, bLoss = 8 - BBits, aLoss = 8 - ABits;
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rShift = RShift, gShift = GShift, bShift = BShift, aShift = AShift;
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}
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static inline PixelFormat createFormatCLUT8() {
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return PixelFormat(1, 0, 0, 0, 0, 0, 0, 0, 0);
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}
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inline bool operator==(const PixelFormat &fmt) const {
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// TODO: If aLoss==8, then the value of aShift is irrelevant, and should be ignored.
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return 0 == memcmp(this, &fmt, sizeof(PixelFormat));
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}
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inline bool operator!=(const PixelFormat &fmt) const {
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return !(*this == fmt);
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}
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inline uint32 RGBToColor(uint8 r, uint8 g, uint8 b) const {
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return
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((0xFF >> aLoss) << aShift) |
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(( r >> rLoss) << rShift) |
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(( g >> gLoss) << gShift) |
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(( b >> bLoss) << bShift);
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}
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inline uint32 ARGBToColor(uint8 a, uint8 r, uint8 g, uint8 b) const {
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return
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((a >> aLoss) << aShift) |
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((r >> rLoss) << rShift) |
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((g >> gLoss) << gShift) |
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((b >> bLoss) << bShift);
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}
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inline void colorToRGB(uint32 color, uint8 &r, uint8 &g, uint8 &b) const {
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r = ((color >> rShift) << rLoss) & 0xFF;
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g = ((color >> gShift) << gLoss) & 0xFF;
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b = ((color >> bShift) << bLoss) & 0xFF;
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}
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inline void colorToARGB(uint32 color, uint8 &a, uint8 &r, uint8 &g, uint8 &b) const {
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a = (aBits() == 0) ? 0xFF : (((color >> aShift) << aLoss) & 0xFF);
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r = ((color >> rShift) << rLoss) & 0xFF;
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g = ((color >> gShift) << gLoss) & 0xFF;
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b = ((color >> bShift) << bLoss) & 0xFF;
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}
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//////////////////////////////////////////////////////////////////////
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// Convenience functions for getting number of color component bits //
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//////////////////////////////////////////////////////////////////////
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inline byte rBits() const {
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return (8 - rLoss);
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}
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inline byte gBits() const {
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return (8 - gLoss);
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}
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inline byte bBits() const {
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return (8 - bLoss);
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}
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inline byte aBits() const {
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return (8 - aLoss);
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}
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////////////////////////////////////////////////////////////////////////
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// Convenience functions for getting color components' maximum values //
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////////////////////////////////////////////////////////////////////////
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inline uint rMax() const {
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return (1 << rBits()) - 1;
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}
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inline uint gMax() const {
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return (1 << gBits()) - 1;
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}
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inline uint bMax() const {
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return (1 << bBits()) - 1;
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}
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inline uint aMax() const {
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return (1 << aBits()) - 1;
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}
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};
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} // End of namespace Graphics
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#endif
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