mirror of
https://github.com/libretro/scummvm.git
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291 lines
7.0 KiB
C++
291 lines
7.0 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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*
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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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*
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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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#include "common/str.h"
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namespace Graphics {
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/** Template to expand from an n-bit component to an 8-bit component */
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template<int depth>
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struct ColorComponent {
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};
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template<>
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struct ColorComponent<0> {
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static inline uint expand(uint value) {
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return 0;
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}
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};
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template<>
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struct ColorComponent<1> {
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static inline uint expand(uint value) {
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value &= 1;
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return value |
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(value << 1) |
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(value << 2) |
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(value << 3) |
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(value << 4) |
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(value << 5) |
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(value << 6) |
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(value << 7);
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}
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};
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template<>
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struct ColorComponent<2> {
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static inline uint expand(uint value) {
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value &= 3;
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return value |
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(value << 2) |
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(value << 4) |
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(value << 6);
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}
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};
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template<>
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struct ColorComponent<3> {
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static inline uint expand(uint value) {
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value &= 7;
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return (value << 5) |
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(value << 2) |
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(value >> 1);
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}
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};
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template<>
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struct ColorComponent<4> {
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static inline uint expand(uint value) {
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value &= 15;
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return value |
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(value << 4);
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}
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};
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template<>
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struct ColorComponent<5> {
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static inline uint expand(uint value) {
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value &= 31;
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return (value << 3) |
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(value >> 2);
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}
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};
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template<>
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struct ColorComponent<6> {
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static inline uint expand(uint value) {
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value &= 63;
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return (value << 2) |
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(value >> 4);
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}
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};
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template<>
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struct ColorComponent<7> {
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static inline uint expand(uint value) {
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value &= 127;
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return (value << 1) |
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(value >> 6);
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}
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};
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template<>
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struct ColorComponent<8> {
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static inline uint expand(uint value) {
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return value & 255;
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}
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};
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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;
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gLoss = 8 - GBits;
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bLoss = 8 - BBits;
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aLoss = 8 - ABits;
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rShift = RShift;
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gShift = GShift;
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bShift = BShift;
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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 bytesPerPixel == fmt.bytesPerPixel &&
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rLoss == fmt.rLoss &&
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gLoss == fmt.gLoss &&
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bLoss == fmt.bLoss &&
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aLoss == fmt.aLoss &&
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rShift == fmt.rShift &&
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gShift == fmt.gShift &&
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bShift == fmt.bShift &&
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aShift == fmt.aShift;
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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 = expand(rBits(), color >> rShift);
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g = expand(gBits(), color >> gShift);
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b = expand(bBits(), color >> bShift);
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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 : expand(aBits(), color >> aShift);
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r = expand(rBits(), color >> rShift);
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g = expand(gBits(), color >> gShift);
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b = expand(bBits(), color >> bShift);
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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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inline byte bpp() const {
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return rBits() + gBits() + bBits() + aBits();
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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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/** Expand a given bit-depth component to a full 8-bit component */
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static inline uint expand(uint bits, uint color) {
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switch (bits) {
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case 0:
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return ColorComponent<0>::expand(color);
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case 1:
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return ColorComponent<1>::expand(color);
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case 2:
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return ColorComponent<2>::expand(color);
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case 3:
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return ColorComponent<3>::expand(color);
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case 4:
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return ColorComponent<4>::expand(color);
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case 5:
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return ColorComponent<5>::expand(color);
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case 6:
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return ColorComponent<6>::expand(color);
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case 7:
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return ColorComponent<7>::expand(color);
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case 8:
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return ColorComponent<8>::expand(color);
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default:
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break;
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}
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// Unsupported
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return 0;
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}
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Common::String toString() const;
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};
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} // End of namespace Graphics
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#endif
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