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626f85ae5e
This function is used in only one place. Declaring it requires common/list.h; by putting it into pixelformat.h, which is included by common/system.h, tons of things suddenly included list.h for no good reason. If we ever need to call this function in other places, we can figure out aborts more appropriate place for it. svn-id: r46310
153 lines
4.5 KiB
C++
153 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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* $URL$
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* $Id$
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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 = ((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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