mirror of
https://github.com/libretro/scummvm.git
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288 lines
7.8 KiB
C++
288 lines
7.8 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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#include "graphics/pixelformat.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 kHighBitsMask / kLowBitsMask / 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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kHighBitsMask = 0xF7DEF7DE,
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kLowBitsMask = 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 = 0,
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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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kLowBits = (1 << kRedShift) | (1 << kGreenShift) | (1 << kBlueShift)
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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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kHighBitsMask = 0x7BDE7BDE,
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kLowBitsMask = 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 = 0,
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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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kLowBits = (1 << kRedShift) | (1 << kGreenShift) | (1 << kBlueShift)
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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 = 0,
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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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* Convert a 'bitFormat' as defined by one of the ColorMasks
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* into a PixelFormat.
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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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} // end of namespace Graphics
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#endif
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