mirror of
https://github.com/libretro/scummvm.git
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215 lines
7.9 KiB
C++
215 lines
7.9 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_SCALER_INTERN_H
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#define GRAPHICS_SCALER_INTERN_H
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#include "common/scummsys.h"
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#include "graphics/colormasks.h"
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/**
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* Interpolate two 16 bit pixel *pairs* at once with equal weights 1.
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* In particular, p1 and p2 can contain two pixels each in the upper
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* and lower halves.
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*/
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template<typename ColorMask>
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static inline uint32 interpolate32_1_1(uint32 p1, uint32 p2) {
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return (((p1 & ColorMask::kHighBitsMask) >> 1) +
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((p2 & ColorMask::kHighBitsMask) >> 1) +
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(p1 & p2 & ColorMask::kLowBitsMask));
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}
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/**
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* Interpolate two 16 bit pixel *pairs* at once with weights 3 resp. 1.
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* In particular, p1 and p2 can contain two pixels/each in the upper
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* and lower halves.
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*/
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template<typename ColorMask>
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static inline uint32 interpolate32_3_1(uint32 p1, uint32 p2) {
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register uint32 x = ((p1 & ColorMask::qhighBits) >> 2) * 3 + ((p2 & ColorMask::qhighBits) >> 2);
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register uint32 y = ((p1 & ColorMask::qlowBits) * 3 + (p2 & ColorMask::qlowBits)) >> 2;
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y &= ColorMask::qlowBits;
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return x + y;
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}
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/**
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* Interpolate two 16 bit pixels with weights 1 and 1, i.e., (p1+p2)/2.
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* See <http://www.slack.net/~ant/info/rgb_mixing.html> for details on how this works.
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*/
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template<typename ColorMask>
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static inline unsigned interpolate16_1_1(unsigned p1, unsigned p2) {
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const unsigned lowbits = (p1 ^ p2) & ColorMask::kLowBits;
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return ((p1 + p2) - lowbits) >> 1;
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}
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/**
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* Interpolate two 16 bit pixels with weights 3 and 1, i.e., (3*p1+p2)/4.
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*/
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template<typename ColorMask>
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static inline unsigned interpolate16_3_1(unsigned p1, unsigned p2) {
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const unsigned lowbits = (((p1 & ColorMask::kLowBits) << 1) + (p1 & ColorMask::kLow2Bits)
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+ (p2 & ColorMask::kLow2Bits)) & ColorMask::kLow2Bits;
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return ((p1*3 + p2) - lowbits) >> 2;
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}
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/**
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* Interpolate two 16 bit pixels with weights 7 and 1, i.e., (7*p1+p2)/8.
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*/
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template<typename ColorMask>
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static inline unsigned interpolate16_7_1(unsigned p1, unsigned p2) {
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const unsigned lowbits = (((p1 & ColorMask::kLowBits) << 2) + ((p1 & ColorMask::kLow2Bits) << 1) + (p1 & ColorMask::kLow3Bits)
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+ (p2 & ColorMask::kLow3Bits)) & ColorMask::kLow3Bits;
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return ((p1*7+p2) - lowbits) >> 3;
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}
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/**
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* Interpolate three 16 bit pixels with weights 2, 1, and 1, i.e., (2*p1+p2+p3)/4.
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*/
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template<typename ColorMask>
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static inline unsigned interpolate16_2_1_1(unsigned p1, unsigned p2, unsigned p3) {
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p1<<=1;
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const unsigned lowbits = ((p1 & (ColorMask::kLowBits << 1))
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+ (p2 & ColorMask::kLow2Bits)
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+ (p3 & ColorMask::kLow2Bits)) & ColorMask::kLow2Bits;
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return ((p1+p2+p3) - lowbits) >> 2;
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}
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/**
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* Interpolate three 16 bit pixels with weights 5, 2, and 1, i.e., (5*p1+2*p2+p3)/8.
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*/
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template<typename ColorMask>
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static inline unsigned interpolate16_5_2_1(unsigned p1, unsigned p2, unsigned p3) {
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p2<<=1;
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const unsigned lowbits = (((p1 & ColorMask::kLowBits) << 2) + (p1 & ColorMask::kLow3Bits)
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+ (p2 & (ColorMask::kLow2Bits << 1))
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+ (p3 & ColorMask::kLow3Bits)) & ColorMask::kLow3Bits;
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return ((p1*5 + p2 + p3) - lowbits) >> 3;
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}
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/**
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* Interpolate three 16 bit pixels with weights 6, 1, and 1, i.e., (6*p1+p2+p3)/8.
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*/
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template<typename ColorMask>
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static inline unsigned interpolate16_6_1_1(unsigned p1, unsigned p2, unsigned p3) {
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const unsigned lowbits = (((((p1 & ColorMask::kLowBits) << 1) + (p1 & ColorMask::kLow2Bits)) << 1)
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+ (p2 & ColorMask::kLow3Bits)
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+ (p3 & ColorMask::kLow3Bits)) & ColorMask::kLow3Bits;
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return ((p1*6 + p2 + p3) - lowbits) >> 3;
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}
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/**
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* Interpolate three 16 bit pixels with weights 2, 3, and 3, i.e., (2*p1+3*(p2+p3))/8.
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*/
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template<typename ColorMask>
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static inline unsigned interpolate16_2_3_3(unsigned p1, unsigned p2, unsigned p3) {
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p1 <<= 1;
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const unsigned rb = (p1 & (ColorMask::kRedBlueMask<<1))
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+ ((p2 & ColorMask::kRedBlueMask) + (p3 & ColorMask::kRedBlueMask))*3;
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const unsigned g = (p1 & (ColorMask::kGreenMask<<1))
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+ ((p2 & ColorMask::kGreenMask) + (p3 & ColorMask::kGreenMask))*3;
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return ((rb & (ColorMask::kRedBlueMask<<3)) | (g & (ColorMask::kGreenMask<<3))) >> 3;
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}
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/**
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* Interpolate three 16 bit pixels with weights 2, 7, and 7, i.e., (2*p1+7*(p2+p3))/16.
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*/
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template<typename ColorMask>
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static inline unsigned interpolate16_2_7_7(unsigned p1, unsigned p2, unsigned p3) {
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p1 <<= 1;
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const unsigned rb = (p1 & (ColorMask::kRedBlueMask<<1))
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+ ((p2 & ColorMask::kRedBlueMask) + (p3 & ColorMask::kRedBlueMask))*7;
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const unsigned g = (p1 & (ColorMask::kGreenMask<<1))
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+ ((p2 & ColorMask::kGreenMask) + (p3 & ColorMask::kGreenMask))*7;
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return ((rb & (ColorMask::kRedBlueMask<<4)) | (g & (ColorMask::kGreenMask<<4))) >> 4;
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}
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/**
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* Interpolate three 16 bit pixels with weights 14, 1, and 1, i.e., (14*p1+p2+p3)/16.
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*/
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template<typename ColorMask>
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static inline unsigned interpolate16_14_1_1(unsigned p1, unsigned p2, unsigned p3) {
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const unsigned rb = (p1&ColorMask::kRedBlueMask)*14
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+ (p2&ColorMask::kRedBlueMask)
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+ (p3&ColorMask::kRedBlueMask);
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const unsigned g = (p1&ColorMask::kGreenMask)*14
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+ (p2&ColorMask::kGreenMask) + (p3&ColorMask::kGreenMask);
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return ((rb&(ColorMask::kRedBlueMask<<4)) | (g&(ColorMask::kGreenMask<<4))) >> 4;
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}
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/**
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* Interpolate four 16 bit pixels with weights 1, 1, 1, and 1, i.e., (p1+p2+p3+p4)/4.
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*/
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template<typename ColorMask>
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static inline unsigned interpolate16_1_1_1_1(unsigned p1, unsigned p2, unsigned p3, unsigned p4) {
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const unsigned lowbits = ((p1 & ColorMask::kLow2Bits)
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+ (p2 & ColorMask::kLow2Bits)
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+ (p3 & ColorMask::kLow2Bits)
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+ (p4 & ColorMask::kLow2Bits)) & ColorMask::kLow2Bits;
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return ((p1+p2+p3+p4) - lowbits) >> 2;
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}
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/**
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* Compare two YUV values (encoded 8-8-8) and check if they differ by more than
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* a certain hard coded threshold. Used by the hq scaler family.
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*/
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static inline bool diffYUV(int yuv1, int yuv2) {
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static const int Ymask = 0x00FF0000;
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static const int Umask = 0x0000FF00;
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static const int Vmask = 0x000000FF;
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static const int trY = 0x00300000;
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static const int trU = 0x00000700;
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static const int trV = 0x00000006;
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int diff;
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int mask;
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diff = ((yuv1 & Umask) - (yuv2 & Umask));
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mask = diff >> 31; // -1 if value < 0, 0 otherwise
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diff = (diff ^ mask) - mask; //-1: ~value + 1; 0: value
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if (diff > trU) return true;
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diff = ((yuv1 & Vmask) - (yuv2 & Vmask));
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mask = diff >> 31; // -1 if value < 0, 0 otherwise
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diff = (diff ^ mask) - mask; //-1: ~value + 1; 0: value
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if (diff > trV) return true;
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diff = ((yuv1 & Ymask) - (yuv2 & Ymask));
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mask = diff >> 31; // -1 if value < 0, 0 otherwise
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diff = (diff ^ mask) - mask; //-1: ~value + 1; 0: value
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if (diff > trY) return true;
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return false;
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/*
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return
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( ( ABS((yuv1 & Ymask) - (yuv2 & Ymask)) > trY ) ||
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( ABS((yuv1 & Umask) - (yuv2 & Umask)) > trU ) ||
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( ABS((yuv1 & Vmask) - (yuv2 & Vmask)) > trV ) );
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*/
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}
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#endif
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