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https://github.com/libretro/scummvm.git
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328 lines
9.4 KiB
C++
328 lines
9.4 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_COLORMASKS_H
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#define GRAPHICS_COLORMASKS_H
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namespace Graphics {
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template<int bitFormat>
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struct ColorMasks {
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};
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/*
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The ColorMasks template can be used to map bit format values
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(like 555, 565, 1555, 4444) to corresponding bit masks and shift values.
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Currently this is only meant for
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The meaning of these is masks is the following:
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kBytesPerPixel
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-> how many bytes per pixel for that format
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kRedMask, kGreenMask, kBlueMask
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-> bitmask, and this with the color to select only the bits of the corresponding color
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The k*Bits and k*Shift values can be used to extract R,G,B. I.e. to get
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the red color component of a pixel, as a 8-bit value, you would write
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R = ((color & kRedMask) >> kRedShift) << (8-kRedBits)
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Actually, instead of the simple left shift, one might want to use somewhat
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more sophisticated code (which fills up the least significant bits with
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appropriate data).
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The highBits / lowBits / qhighBits / qlowBits are special values that are
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used in the super-optimized interpolation functions in scaler/intern.h
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and scaler/aspect.cpp. Currently they are only available in 555 and 565 mode.
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To be specific: They pack the masks for two 16 bit pixels at once. The pixels
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are split into "high" and "low" bits, which are then separately interpolated
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and finally re-composed. That way, 2x2 pixels or even 4x2 pixels can
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be interpolated in one go.
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*/
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template<>
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struct ColorMasks<565> {
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enum {
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highBits = 0xF7DEF7DE,
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lowBits = 0x08210821,
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qhighBits = 0xE79CE79C,
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qlowBits = 0x18631863,
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kBytesPerPixel = 2,
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kAlphaBits = 0,
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kRedBits = 5,
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kGreenBits = 6,
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kBlueBits = 5,
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kAlphaShift = kRedBits+kGreenBits+kBlueBits,
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kRedShift = kGreenBits+kBlueBits,
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kGreenShift = kBlueBits,
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kBlueShift = 0,
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kAlphaMask = ((1 << kAlphaBits) - 1) << kAlphaShift,
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kRedMask = ((1 << kRedBits) - 1) << kRedShift,
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kGreenMask = ((1 << kGreenBits) - 1) << kGreenShift,
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kBlueMask = ((1 << kBlueBits) - 1) << kBlueShift,
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kRedBlueMask = kRedMask | kBlueMask
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};
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};
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template<>
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struct ColorMasks<555> {
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enum {
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highBits = 0x7BDE7BDE,
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lowBits = 0x04210421,
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qhighBits = 0x739C739C,
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qlowBits = 0x0C630C63,
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kBytesPerPixel = 2,
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kAlphaBits = 0,
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kRedBits = 5,
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kGreenBits = 5,
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kBlueBits = 5,
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kAlphaShift = kRedBits+kGreenBits+kBlueBits,
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kRedShift = kGreenBits+kBlueBits,
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kGreenShift = kBlueBits,
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kBlueShift = 0,
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kAlphaMask = ((1 << kAlphaBits) - 1) << kAlphaShift,
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kRedMask = ((1 << kRedBits) - 1) << kRedShift,
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kGreenMask = ((1 << kGreenBits) - 1) << kGreenShift,
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kBlueMask = ((1 << kBlueBits) - 1) << kBlueShift,
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kRedBlueMask = kRedMask | kBlueMask
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};
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};
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template<>
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struct ColorMasks<1555> {
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enum {
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kBytesPerPixel = 2,
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kAlphaBits = 1,
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kRedBits = 5,
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kGreenBits = 5,
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kBlueBits = 5,
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kAlphaShift = kRedBits+kGreenBits+kBlueBits,
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kRedShift = kGreenBits+kBlueBits,
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kGreenShift = kBlueBits,
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kBlueShift = 0,
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kAlphaMask = ((1 << kAlphaBits) - 1) << kAlphaShift,
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kRedMask = ((1 << kRedBits) - 1) << kRedShift,
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kGreenMask = ((1 << kGreenBits) - 1) << kGreenShift,
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kBlueMask = ((1 << kBlueBits) - 1) << kBlueShift,
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kRedBlueMask = kRedMask | kBlueMask
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};
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};
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template<>
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struct ColorMasks<4444> {
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enum {
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kBytesPerPixel = 2,
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kAlphaBits = 4,
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kRedBits = 4,
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kGreenBits = 4,
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kBlueBits = 4,
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kAlphaShift = kRedBits+kGreenBits+kBlueBits,
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kRedShift = kGreenBits+kBlueBits,
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kGreenShift = kBlueBits,
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kBlueShift = 0,
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kAlphaMask = ((1 << kAlphaBits) - 1) << kAlphaShift,
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kRedMask = ((1 << kRedBits) - 1) << kRedShift,
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kGreenMask = ((1 << kGreenBits) - 1) << kGreenShift,
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kBlueMask = ((1 << kBlueBits) - 1) << kBlueShift,
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kRedBlueMask = kRedMask | kBlueMask
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};
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};
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template<>
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struct ColorMasks<888> {
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enum {
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kBytesPerPixel = 4,
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kAlphaBits = 0,
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kRedBits = 8,
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kGreenBits = 8,
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kBlueBits = 8,
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kAlphaShift = kRedBits+kGreenBits+kBlueBits,
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kRedShift = kGreenBits+kBlueBits,
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kGreenShift = kBlueBits,
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kBlueShift = 0,
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kAlphaMask = ((1 << kAlphaBits) - 1) << kAlphaShift,
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kRedMask = ((1 << kRedBits) - 1) << kRedShift,
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kGreenMask = ((1 << kGreenBits) - 1) << kGreenShift,
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kBlueMask = ((1 << kBlueBits) - 1) << kBlueShift,
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kRedBlueMask = kRedMask | kBlueMask
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};
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};
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template<>
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struct ColorMasks<8888> {
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enum {
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kBytesPerPixel = 4,
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kAlphaBits = 8,
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kRedBits = 8,
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kGreenBits = 8,
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kBlueBits = 8,
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kAlphaShift = kRedBits+kGreenBits+kBlueBits,
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kRedShift = kGreenBits+kBlueBits,
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kGreenShift = kBlueBits,
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kBlueShift = 0,
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kAlphaMask = ((1 << kAlphaBits) - 1) << kAlphaShift,
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kRedMask = ((1 << kRedBits) - 1) << kRedShift,
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kGreenMask = ((1 << kGreenBits) - 1) << kGreenShift,
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kBlueMask = ((1 << kBlueBits) - 1) << kBlueShift,
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kRedBlueMask = kRedMask | kBlueMask
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};
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};
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template<class T>
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uint32 RGBToColor(uint8 r, uint8 g, uint8 b) {
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return T::kAlphaMask |
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(((r << T::kRedShift) >> (8 - T::kRedBits)) & T::kRedMask) |
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(((g << T::kGreenShift) >> (8 - T::kGreenBits)) & T::kGreenMask) |
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(((b << T::kBlueShift) >> (8 - T::kBlueBits)) & T::kBlueMask);
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}
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template<class T>
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uint32 ARGBToColor(uint8 a, uint8 r, uint8 g, uint8 b) {
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return (((a << T::kAlphaShift) >> (8 - T::kAlphaBits)) & T::kAlphaMask) |
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(((r << T::kRedShift) >> (8 - T::kRedBits)) & T::kRedMask) |
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(((g << T::kGreenShift) >> (8 - T::kGreenBits)) & T::kGreenMask) |
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(((b << T::kBlueShift) >> (8 - T::kBlueBits)) & T::kBlueMask);
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}
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template<class T>
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void colorToRGB(uint32 color, uint8 &r, uint8 &g, uint8 &b) {
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r = ((color & T::kRedMask) >> T::kRedShift) << (8 - T::kRedBits);
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g = ((color & T::kGreenMask) >> T::kGreenShift) << (8 - T::kGreenBits);
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b = ((color & T::kBlueMask) >> T::kBlueShift) << (8 - T::kBlueBits);
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}
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template<class T>
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void colorToARGB(uint32 color, uint8 &a, uint8 &r, uint8 &g, uint8 &b) {
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a = ((color & T::kAlphaMask) >> T::kAlphaShift) << (8 - T::kAlphaBits);
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r = ((color & T::kRedMask) >> T::kRedShift) << (8 - T::kRedBits);
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g = ((color & T::kGreenMask) >> T::kGreenShift) << (8 - T::kGreenBits);
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b = ((color & T::kBlueMask) >> T::kBlueShift) << (8 - T::kBlueBits);
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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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};
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template<int bitFormat>
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PixelFormat createPixelFormat() {
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PixelFormat format;
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format.bytesPerPixel = ColorMasks<bitFormat>::kBytesPerPixel;
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format.rLoss = 8 - ColorMasks<bitFormat>::kRedBits;
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format.gLoss = 8 - ColorMasks<bitFormat>::kGreenBits;
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format.bLoss = 8 - ColorMasks<bitFormat>::kBlueBits;
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format.aLoss = 8 - ColorMasks<bitFormat>::kAlphaBits;
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format.rShift = ColorMasks<bitFormat>::kRedShift;
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format.gShift = ColorMasks<bitFormat>::kGreenShift;
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format.bShift = ColorMasks<bitFormat>::kBlueShift;
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format.aShift = ColorMasks<bitFormat>::kAlphaShift;
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return format;
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}
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inline uint32 RGBToColor(uint8 r, uint8 g, uint8 b, const PixelFormat &fmt) {
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return
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((0xFF >> fmt.aLoss) << fmt.aShift) |
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(( r >> fmt.rLoss) << fmt.rShift) |
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(( g >> fmt.gLoss) << fmt.gShift) |
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(( b >> fmt.bLoss) << fmt.bShift);
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}
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inline uint32 ARGBToColor(uint8 a, uint8 r, uint8 g, uint8 b, const PixelFormat &fmt) {
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return
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((a >> fmt.aLoss) << fmt.aShift) |
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((r >> fmt.rLoss) << fmt.rShift) |
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((g >> fmt.gLoss) << fmt.gShift) |
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((b >> fmt.bLoss) << fmt.bShift);
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}
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inline void colorToRGB(uint32 color, uint8 &r, uint8 &g, uint8 &b, const PixelFormat &fmt) {
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r = ((color >> fmt.rShift) << fmt.rLoss) & 0xFF;
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g = ((color >> fmt.gShift) << fmt.gLoss) & 0xFF;
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b = ((color >> fmt.bShift) << fmt.bLoss) & 0xFF;
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}
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inline void colorToARGB(uint32 color, uint8 &a, uint8 &r, uint8 &g, uint8 &b, const PixelFormat &fmt) {
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a = ((color >> fmt.aShift) << fmt.aLoss) & 0xFF;
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r = ((color >> fmt.rShift) << fmt.rLoss) & 0xFF;
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g = ((color >> fmt.gShift) << fmt.gLoss) & 0xFF;
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b = ((color >> fmt.bShift) << fmt.bLoss) & 0xFF;
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}
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} // end of namespace Graphics
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#endif
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