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519 lines
15 KiB
C++
519 lines
15 KiB
C++
/*
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* This file is part of the Scale2x project.
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*
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* Copyright (C) 2001, 2002, 2003, 2004 Andrea Mazzoleni
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*
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* This file contains a C and MMX implementation of the Scale2x effect.
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*
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* You can find an high level description of the effect at :
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*
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* http://scale2x.sourceforge.net/
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*
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* Alternatively at the previous license terms, you are allowed to use this
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* code in your program with these conditions:
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* - the program is not used in commercial activities.
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* - the whole source code of the program is released with the binary.
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* - derivative works of the program are allowed.
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*/
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#include "common/scummsys.h"
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#include "graphics/scaler/intern.h"
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#include "graphics/scaler/scale2x.h"
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#include <assert.h>
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/***************************************************************************/
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/* Scale2x C implementation */
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static inline void scale2x_8_def_single(scale2x_uint8* __restrict__ dst, const scale2x_uint8* __restrict__ src0, const scale2x_uint8* __restrict__ src1, const scale2x_uint8* __restrict__ src2, unsigned count)
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{
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/* central pixels */
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while (count) {
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if (src0[0] != src2[0] && src1[-1] != src1[1]) {
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dst[0] = src1[-1] == src0[0] ? src0[0] : src1[0];
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dst[1] = src1[1] == src0[0] ? src0[0] : src1[0];
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} else {
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dst[0] = src1[0];
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dst[1] = src1[0];
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}
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++src0;
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++src1;
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++src2;
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dst += 2;
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--count;
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}
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}
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static inline void scale2x_16_def_single(scale2x_uint16* __restrict__ dst, const scale2x_uint16* __restrict__ src0, const scale2x_uint16* __restrict__ src1, const scale2x_uint16* __restrict__ src2, unsigned count)
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{
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/* central pixels */
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while (count) {
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if (src0[0] != src2[0] && src1[-1] != src1[1]) {
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dst[0] = src1[-1] == src0[0] ? src0[0] : src1[0];
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dst[1] = src1[1] == src0[0] ? src0[0] : src1[0];
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} else {
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dst[0] = src1[0];
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dst[1] = src1[0];
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}
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++src0;
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++src1;
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++src2;
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dst += 2;
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--count;
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}
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}
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static inline void scale2x_32_def_single(scale2x_uint32* __restrict__ dst, const scale2x_uint32* __restrict__ src0, const scale2x_uint32* __restrict__ src1, const scale2x_uint32* __restrict__ src2, unsigned count)
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{
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/* central pixels */
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while (count) {
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if (src0[0] != src2[0] && src1[-1] != src1[1]) {
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dst[0] = src1[-1] == src0[0] ? src0[0] : src1[0];
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dst[1] = src1[1] == src0[0] ? src0[0] : src1[0];
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} else {
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dst[0] = src1[0];
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dst[1] = src1[0];
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}
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++src0;
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++src1;
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++src2;
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dst += 2;
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--count;
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}
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}
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/**
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* Scale by a factor of 2 a row of pixels of 8 bits.
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* The function is implemented in C.
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* The pixels over the left and right borders are assumed of the same color of
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* the pixels on the border.
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* \param src0 Pointer at the first pixel of the previous row.
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* \param src1 Pointer at the first pixel of the current row.
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* \param src2 Pointer at the first pixel of the next row.
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* \param count Length in pixels of the src0, src1 and src2 rows.
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* It must be at least 2.
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* \param dst0 First destination row, double length in pixels.
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* \param dst1 Second destination row, double length in pixels.
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*/
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void scale2x_8_def(scale2x_uint8* dst0, scale2x_uint8* dst1, const scale2x_uint8* src0, const scale2x_uint8* src1, const scale2x_uint8* src2, unsigned count)
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{
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scale2x_8_def_single(dst0, src0, src1, src2, count);
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scale2x_8_def_single(dst1, src2, src1, src0, count);
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}
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/**
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* Scale by a factor of 2 a row of pixels of 16 bits.
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* This function operates like scale2x_8_def() but for 16 bits pixels.
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* \param src0 Pointer at the first pixel of the previous row.
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* \param src1 Pointer at the first pixel of the current row.
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* \param src2 Pointer at the first pixel of the next row.
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* \param count Length in pixels of the src0, src1 and src2 rows.
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* It must be at least 2.
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* \param dst0 First destination row, double length in pixels.
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* \param dst1 Second destination row, double length in pixels.
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*/
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void scale2x_16_def(scale2x_uint16* dst0, scale2x_uint16* dst1, const scale2x_uint16* src0, const scale2x_uint16* src1, const scale2x_uint16* src2, unsigned count)
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{
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scale2x_16_def_single(dst0, src0, src1, src2, count);
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scale2x_16_def_single(dst1, src2, src1, src0, count);
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}
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/**
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* Scale by a factor of 2 a row of pixels of 32 bits.
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* This function operates like scale2x_8_def() but for 32 bits pixels.
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* \param src0 Pointer at the first pixel of the previous row.
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* \param src1 Pointer at the first pixel of the current row.
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* \param src2 Pointer at the first pixel of the next row.
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* \param count Length in pixels of the src0, src1 and src2 rows.
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* It must be at least 2.
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* \param dst0 First destination row, double length in pixels.
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* \param dst1 Second destination row, double length in pixels.
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*/
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void scale2x_32_def(scale2x_uint32* dst0, scale2x_uint32* dst1, const scale2x_uint32* src0, const scale2x_uint32* src1, const scale2x_uint32* src2, unsigned count)
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{
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scale2x_32_def_single(dst0, src0, src1, src2, count);
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scale2x_32_def_single(dst1, src2, src1, src0, count);
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}
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/***************************************************************************/
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/* Scale2x MMX implementation */
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#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
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/*
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* Apply the Scale2x effect at a single row.
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* This function must be called only by the other scale2x functions.
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*
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* Considering the pixel map :
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*
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* ABC (src0)
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* DEF (src1)
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* GHI (src2)
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*
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* this functions compute 2 new pixels in substitution of the source pixel E
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* like this map :
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*
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* ab (dst)
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*
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* with these variables :
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*
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* ¤t -> E
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* ¤t_left -> D
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* ¤t_right -> F
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* ¤t_upper -> B
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* ¤t_lower -> H
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*
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* %0 -> current_upper
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* %1 -> current
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* %2 -> current_lower
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* %3 -> dst
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* %4 -> counter
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*
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* %mm0 -> *current_left
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* %mm1 -> *current_next
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* %mm2 -> tmp0
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* %mm3 -> tmp1
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* %mm4 -> tmp2
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* %mm5 -> tmp3
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* %mm6 -> *current_upper
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* %mm7 -> *current
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*/
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static inline void scale2x_8_mmx_single(scale2x_uint8* dst, const scale2x_uint8* src0, const scale2x_uint8* src1, const scale2x_uint8* src2, unsigned count)
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{
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assert(count >= 16);
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assert(count % 8 == 0);
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__asm__ __volatile__(
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/* central runs */
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"shr $3, %4\n"
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"jz 1f\n"
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"0:\n"
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/* set the current, current_pre, current_next registers */
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"movq -8(%1), %%mm0\n"
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"movq (%1), %%mm7\n"
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"movq 8(%1), %%mm1\n"
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"psrlq $56, %%mm0\n"
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"psllq $56, %%mm1\n"
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"movq %%mm7, %%mm2\n"
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"movq %%mm7, %%mm3\n"
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"psllq $8, %%mm2\n"
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"psrlq $8, %%mm3\n"
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"por %%mm2, %%mm0\n"
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"por %%mm3, %%mm1\n"
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/* current_upper */
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"movq (%0), %%mm6\n"
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/* compute the upper-left pixel for dst on %%mm2 */
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/* compute the upper-right pixel for dst on %%mm4 */
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"movq %%mm0, %%mm2\n"
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"movq %%mm1, %%mm4\n"
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"movq %%mm0, %%mm3\n"
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"movq %%mm1, %%mm5\n"
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"pcmpeqb %%mm6, %%mm2\n"
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"pcmpeqb %%mm6, %%mm4\n"
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"pcmpeqb (%2), %%mm3\n"
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"pcmpeqb (%2), %%mm5\n"
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"pandn %%mm2, %%mm3\n"
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"pandn %%mm4, %%mm5\n"
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"movq %%mm0, %%mm2\n"
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"movq %%mm1, %%mm4\n"
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"pcmpeqb %%mm1, %%mm2\n"
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"pcmpeqb %%mm0, %%mm4\n"
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"pandn %%mm3, %%mm2\n"
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"pandn %%mm5, %%mm4\n"
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"movq %%mm2, %%mm3\n"
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"movq %%mm4, %%mm5\n"
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"pand %%mm6, %%mm2\n"
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"pand %%mm6, %%mm4\n"
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"pandn %%mm7, %%mm3\n"
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"pandn %%mm7, %%mm5\n"
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"por %%mm3, %%mm2\n"
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"por %%mm5, %%mm4\n"
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/* set *dst */
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"movq %%mm2, %%mm3\n"
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"punpcklbw %%mm4, %%mm2\n"
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"punpckhbw %%mm4, %%mm3\n"
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"movq %%mm2, (%3)\n"
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"movq %%mm3, 8(%3)\n"
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/* next */
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"add $8, %0\n"
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"add $8, %1\n"
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"add $8, %2\n"
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"add $16, %3\n"
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"dec %4\n"
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"jnz 0b\n"
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"1:\n"
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: "+r" (src0), "+r" (src1), "+r" (src2), "+r" (dst), "+r" (count)
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:
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: "cc"
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);
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}
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static inline void scale2x_16_mmx_single(scale2x_uint16* dst, const scale2x_uint16* src0, const scale2x_uint16* src1, const scale2x_uint16* src2, unsigned count)
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{
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assert(count >= 8);
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assert(count % 4 == 0);
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__asm__ __volatile__(
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/* central runs */
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"shr $2, %4\n"
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"jz 1f\n"
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"0:\n"
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/* set the current, current_pre, current_next registers */
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"movq -8(%1), %%mm0\n"
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"movq (%1), %%mm7\n"
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"movq 8(%1), %%mm1\n"
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"psrlq $48, %%mm0\n"
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"psllq $48, %%mm1\n"
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"movq %%mm7, %%mm2\n"
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"movq %%mm7, %%mm3\n"
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"psllq $16, %%mm2\n"
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"psrlq $16, %%mm3\n"
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"por %%mm2, %%mm0\n"
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"por %%mm3, %%mm1\n"
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/* current_upper */
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"movq (%0), %%mm6\n"
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/* compute the upper-left pixel for dst on %%mm2 */
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/* compute the upper-right pixel for dst on %%mm4 */
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"movq %%mm0, %%mm2\n"
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"movq %%mm1, %%mm4\n"
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"movq %%mm0, %%mm3\n"
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"movq %%mm1, %%mm5\n"
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"pcmpeqw %%mm6, %%mm2\n"
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"pcmpeqw %%mm6, %%mm4\n"
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"pcmpeqw (%2), %%mm3\n"
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"pcmpeqw (%2), %%mm5\n"
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"pandn %%mm2, %%mm3\n"
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"pandn %%mm4, %%mm5\n"
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"movq %%mm0, %%mm2\n"
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"movq %%mm1, %%mm4\n"
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"pcmpeqw %%mm1, %%mm2\n"
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"pcmpeqw %%mm0, %%mm4\n"
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"pandn %%mm3, %%mm2\n"
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"pandn %%mm5, %%mm4\n"
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"movq %%mm2, %%mm3\n"
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"movq %%mm4, %%mm5\n"
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"pand %%mm6, %%mm2\n"
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"pand %%mm6, %%mm4\n"
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"pandn %%mm7, %%mm3\n"
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"pandn %%mm7, %%mm5\n"
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"por %%mm3, %%mm2\n"
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"por %%mm5, %%mm4\n"
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/* set *dst */
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"movq %%mm2, %%mm3\n"
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"punpcklwd %%mm4, %%mm2\n"
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"punpckhwd %%mm4, %%mm3\n"
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"movq %%mm2, (%3)\n"
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"movq %%mm3, 8(%3)\n"
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/* next */
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"add $8, %0\n"
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"add $8, %1\n"
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"add $8, %2\n"
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"add $16, %3\n"
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"dec %4\n"
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"jnz 0b\n"
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"1:\n"
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: "+r" (src0), "+r" (src1), "+r" (src2), "+r" (dst), "+r" (count)
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:
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: "cc"
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);
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}
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static inline void scale2x_32_mmx_single(scale2x_uint32* dst, const scale2x_uint32* src0, const scale2x_uint32* src1, const scale2x_uint32* src2, unsigned count)
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{
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assert(count >= 4);
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assert(count % 2 == 0);
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__asm__ __volatile__(
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/* central runs */
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"shr $1, %4\n"
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"jz 1f\n"
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"0:\n"
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/* set the current, current_pre, current_next registers */
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"movq -8(%1), %%mm0\n"
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"movq (%1), %%mm7\n"
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"movq 8(%1), %%mm1\n"
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"psrlq $32, %%mm0\n"
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"psllq $32, %%mm1\n"
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"movq %%mm7, %%mm2\n"
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"movq %%mm7, %%mm3\n"
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"psllq $32, %%mm2\n"
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"psrlq $32, %%mm3\n"
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"por %%mm2, %%mm0\n"
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"por %%mm3, %%mm1\n"
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/* current_upper */
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"movq (%0), %%mm6\n"
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/* compute the upper-left pixel for dst on %%mm2 */
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/* compute the upper-right pixel for dst on %%mm4 */
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"movq %%mm0, %%mm2\n"
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"movq %%mm1, %%mm4\n"
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"movq %%mm0, %%mm3\n"
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"movq %%mm1, %%mm5\n"
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"pcmpeqd %%mm6, %%mm2\n"
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"pcmpeqd %%mm6, %%mm4\n"
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"pcmpeqd (%2), %%mm3\n"
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"pcmpeqd (%2), %%mm5\n"
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"pandn %%mm2, %%mm3\n"
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"pandn %%mm4, %%mm5\n"
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"movq %%mm0, %%mm2\n"
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"movq %%mm1, %%mm4\n"
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"pcmpeqd %%mm1, %%mm2\n"
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"pcmpeqd %%mm0, %%mm4\n"
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"pandn %%mm3, %%mm2\n"
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"pandn %%mm5, %%mm4\n"
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"movq %%mm2, %%mm3\n"
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"movq %%mm4, %%mm5\n"
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"pand %%mm6, %%mm2\n"
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"pand %%mm6, %%mm4\n"
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"pandn %%mm7, %%mm3\n"
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"pandn %%mm7, %%mm5\n"
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"por %%mm3, %%mm2\n"
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"por %%mm5, %%mm4\n"
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/* set *dst */
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"movq %%mm2, %%mm3\n"
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"punpckldq %%mm4, %%mm2\n"
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"punpckhdq %%mm4, %%mm3\n"
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"movq %%mm2, (%3)\n"
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"movq %%mm3, 8(%3)\n"
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/* next */
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"add $8, %0\n"
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"add $8, %1\n"
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"add $8, %2\n"
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"add $16, %3\n"
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"dec %4\n"
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"jnz 0b\n"
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"1:\n"
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: "+r" (src0), "+r" (src1), "+r" (src2), "+r" (dst), "+r" (count)
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:
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: "cc"
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);
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}
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/**
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* Scale by a factor of 2 a row of pixels of 8 bits.
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* This is a very fast MMX implementation.
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* The implementation uses a combination of cmp/and/not operations to
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* completly remove the need of conditional jumps. This trick give the
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* major speed improvement.
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* Also, using the 8 bytes MMX registers more than one pixel are computed
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* at the same time.
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* Before calling this function you must ensure that the currenct CPU supports
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* the MMX instruction set. After calling it you must be sure to call the EMMS
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* instruction before any floating-point operation.
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* The pixels over the left and right borders are assumed of the same color of
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* the pixels on the border.
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* \param src0 Pointer at the first pixel of the previous row.
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* \param src1 Pointer at the first pixel of the current row.
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* \param src2 Pointer at the first pixel of the next row.
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* \param count Length in pixels of the src0, src1 and src2 rows. It must
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* be at least 16 and a multiple of 8.
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* \param dst0 First destination row, double length in pixels.
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* \param dst1 Second destination row, double length in pixels.
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*/
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void scale2x_8_mmx(scale2x_uint8* dst0, scale2x_uint8* dst1, const scale2x_uint8* src0, const scale2x_uint8* src1, const scale2x_uint8* src2, unsigned count)
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{
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if (count % 8 != 0 || count < 16) {
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scale2x_8_def(dst0, dst1, src0, src1, src2, count);
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} else {
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assert(count >= 16);
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assert(count % 8 == 0);
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scale2x_8_mmx_single(dst0, src0, src1, src2, count);
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scale2x_8_mmx_single(dst1, src2, src1, src0, count);
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}
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}
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/**
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* Scale by a factor of 2 a row of pixels of 16 bits.
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* This function operates like scale2x_8_mmx() but for 16 bits pixels.
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* \param src0 Pointer at the first pixel of the previous row.
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* \param src1 Pointer at the first pixel of the current row.
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* \param src2 Pointer at the first pixel of the next row.
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|
* \param count Length in pixels of the src0, src1 and src2 rows. It must
|
|
* be at least 8 and a multiple of 4.
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|
* \param dst0 First destination row, double length in pixels.
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|
* \param dst1 Second destination row, double length in pixels.
|
|
*/
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void scale2x_16_mmx(scale2x_uint16* dst0, scale2x_uint16* dst1, const scale2x_uint16* src0, const scale2x_uint16* src1, const scale2x_uint16* src2, unsigned count)
|
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{
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if (count % 4 != 0 || count < 8) {
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scale2x_16_def(dst0, dst1, src0, src1, src2, count);
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} else {
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|
assert(count >= 8);
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|
assert(count % 4 == 0);
|
|
|
|
scale2x_16_mmx_single(dst0, src0, src1, src2, count);
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scale2x_16_mmx_single(dst1, src2, src1, src0, count);
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}
|
|
}
|
|
|
|
/**
|
|
* Scale by a factor of 2 a row of pixels of 32 bits.
|
|
* This function operates like scale2x_8_mmx() but for 32 bits pixels.
|
|
* \param src0 Pointer at the first pixel of the previous row.
|
|
* \param src1 Pointer at the first pixel of the current row.
|
|
* \param src2 Pointer at the first pixel of the next row.
|
|
* \param count Length in pixels of the src0, src1 and src2 rows. It must
|
|
* be at least 4 and a multiple of 2.
|
|
* \param dst0 First destination row, double length in pixels.
|
|
* \param dst1 Second destination row, double length in pixels.
|
|
*/
|
|
void scale2x_32_mmx(scale2x_uint32* dst0, scale2x_uint32* dst1, const scale2x_uint32* src0, const scale2x_uint32* src1, const scale2x_uint32* src2, unsigned count)
|
|
{
|
|
if (count % 2 != 0 || count < 4) {
|
|
scale2x_32_def(dst0, dst1, src0, src1, src2, count);
|
|
} else {
|
|
assert(count >= 4);
|
|
assert(count % 2 == 0);
|
|
|
|
scale2x_32_mmx_single(dst0, src0, src1, src2, count);
|
|
scale2x_32_mmx_single(dst1, src2, src1, src0, count);
|
|
}
|
|
}
|
|
|
|
#endif
|
|
|