Base our advmame scalers on the official Scale2x source - this way we can easily update to new version and benefit from their optimizations (e.g. MMX support)
svn-id: r14502
This commit is contained in:
Max Horn
parent
d88a9c21d6
commit
2a9c6f6d5f
8 changed files with 1839 additions and 92 deletions
391
common/scaler/scalebit.cpp
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391
common/scaler/scalebit.cpp
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/*
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* This file is part of the Scale2x project.
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*
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* Copyright (C) 2003 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 an example implementation of the Scale effect
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* applyed to a generic bitmap.
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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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#if HAVE_CONFIG_H
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#include <config.h>
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#endif
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#define HAVE_ALLOCA 1
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#define HAVE_ALLOCA_H 1
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#include "scale2x.h"
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#include "scale3x.h"
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#if HAVE_ALLOCA_H
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#include <alloca.h>
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#endif
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#include <assert.h>
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#include <stdlib.h>
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#define DST(bits, num) (scale2x_uint ## bits *)dst ## num
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#define SRC(bits, num) (const scale2x_uint ## bits *)src ## num
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/**
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* Apply the Scale2x effect on a group of rows. Used internally.
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*/
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static inline void stage_scale2x(void* dst0, void* dst1, const void* src0, const void* src1, const void* src2, unsigned pixel, unsigned pixel_per_row)
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{
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switch (pixel) {
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#if defined(__GNUC__) && defined(__i386__)
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case 1 : scale2x_8_mmx(DST(8,0), DST(8,1), SRC(8,0), SRC(8,1), SRC(8,2), pixel_per_row); break;
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case 2 : scale2x_16_mmx(DST(8,0), DST(16,1), SRC(16,0), SRC(16,1), SRC(16,2), pixel_per_row); break;
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case 4 : scale2x_32_mmx(DST(32,0), DST(32,1), SRC(32,0), SRC(32,1), SRC(32,2), pixel_per_row); break;
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#else
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case 1 : scale2x_8_def(DST(8,0), DST(8,1), SRC(8,0), SRC(8,1), SRC(8,2), pixel_per_row); break;
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case 2 : scale2x_16_def(DST(16,0), DST(16,1), SRC(16,0), SRC(16,1), SRC(16,2), pixel_per_row); break;
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case 4 : scale2x_32_def(DST(32,0), DST(32,1), SRC(32,0), SRC(32,1), SRC(32,2), pixel_per_row); break;
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#endif
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}
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}
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/**
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* Apply the Scale3x effect on a group of rows. Used internally.
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*/
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static inline void stage_scale3x(void* dst0, void* dst1, void* dst2, const void* src0, const void* src1, const void* src2, unsigned pixel, unsigned pixel_per_row)
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{
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switch (pixel) {
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case 1 : scale3x_8_def(DST(8,0), DST(8,1), DST(8,2), SRC(8,0), SRC(8,1), SRC(8,2), pixel_per_row); break;
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case 2 : scale3x_16_def(DST(16,0), DST(16,1), DST(16,2), SRC(16,0), SRC(16,1), SRC(16,2), pixel_per_row); break;
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case 4 : scale3x_32_def(DST(32,0), DST(32,1), DST(32,2), SRC(32,0), SRC(32,1), SRC(32,2), pixel_per_row); break;
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}
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}
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/**
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* Apply the Scale4x effect on a group of rows. Used internally.
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*/
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static inline void stage_scale4x(void* dst0, void* dst1, void* dst2, void* dst3, const void* src0, const void* src1, const void* src2, const void* src3, unsigned pixel, unsigned pixel_per_row)
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{
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stage_scale2x(dst0, dst1, src0, src1, src2, pixel, 2 * pixel_per_row);
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stage_scale2x(dst2, dst3, src1, src2, src3, pixel, 2 * pixel_per_row);
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}
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#define SCDST(i) (dst+(i)*dst_slice)
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#define SCSRC(i) (src+(i)*src_slice)
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#define SCMID(i) (mid[(i)])
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/**
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* Apply the Scale2x effect on a bitmap.
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* The destination bitmap is filled with the scaled version of the source bitmap.
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* The source bitmap isn't modified.
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* The destination bitmap must be manually allocated before calling the function,
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* note that the resulting size is exactly 2x2 times the size of the source bitmap.
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* \param void_dst Pointer at the first pixel of the destination bitmap.
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* \param dst_slice Size in bytes of a destination bitmap row.
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* \param void_src Pointer at the first pixel of the source bitmap.
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* \param src_slice Size in bytes of a source bitmap row.
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* \param pixel Bytes per pixel of the source and destination bitmap.
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* \param width Horizontal size in pixels of the source bitmap.
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* \param height Vertical size in pixels of the source bitmap.
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*/
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static void scale2x(void* void_dst, unsigned dst_slice, const void* void_src, unsigned src_slice, unsigned pixel, unsigned width, unsigned height)
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{
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unsigned char* dst = (unsigned char*)void_dst;
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const unsigned char* src = (const unsigned char*)void_src;
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unsigned count;
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assert(height >= 2);
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count = height;
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stage_scale2x(SCDST(0), SCDST(1), SCSRC(0), SCSRC(0), SCSRC(1), pixel, width);
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dst = SCDST(2);
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count -= 2;
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while (count) {
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stage_scale2x(SCDST(0), SCDST(1), SCSRC(0), SCSRC(1), SCSRC(2), pixel, width);
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dst = SCDST(2);
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src = SCSRC(1);
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--count;
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}
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stage_scale2x(SCDST(0), SCDST(1), SCSRC(1-1), SCSRC(2-1), SCSRC(2-1), pixel, width);
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#if defined(__GNUC__) && defined(__i386__)
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scale2x_mmx_emms();
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#endif
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}
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/**
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* Apply the Scale32x effect on a bitmap.
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* The destination bitmap is filled with the scaled version of the source bitmap.
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* The source bitmap isn't modified.
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* The destination bitmap must be manually allocated before calling the function,
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* note that the resulting size is exactly 3x3 times the size of the source bitmap.
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* \param void_dst Pointer at the first pixel of the destination bitmap.
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* \param dst_slice Size in bytes of a destination bitmap row.
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* \param void_src Pointer at the first pixel of the source bitmap.
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* \param src_slice Size in bytes of a source bitmap row.
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* \param pixel Bytes per pixel of the source and destination bitmap.
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* \param width Horizontal size in pixels of the source bitmap.
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* \param height Vertical size in pixels of the source bitmap.
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*/
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static void scale3x(void* void_dst, unsigned dst_slice, const void* void_src, unsigned src_slice, unsigned pixel, unsigned width, unsigned height)
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{
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unsigned char* dst = (unsigned char*)void_dst;
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const unsigned char* src = (const unsigned char*)void_src;
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unsigned count;
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assert(height >= 2);
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count = height;
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stage_scale3x(SCDST(0), SCDST(1), SCDST(2), SCSRC(0), SCSRC(0), SCSRC(1), pixel, width);
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dst = SCDST(3);
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count -= 2;
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while (count) {
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stage_scale3x(SCDST(0), SCDST(1), SCDST(2), SCSRC(0), SCSRC(1), SCSRC(2), pixel, width);
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dst = SCDST(3);
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src = SCSRC(1);
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--count;
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}
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stage_scale3x(SCDST(0), SCDST(1), SCDST(2), SCSRC(1-1), SCSRC(2-1), SCSRC(2-1), pixel, width);
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}
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/**
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* Apply the Scale4x effect on a bitmap.
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* The destination bitmap is filled with the scaled version of the source bitmap.
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* The source bitmap isn't modified.
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* The destination bitmap must be manually allocated before calling the function,
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* note that the resulting size is exactly 4x4 times the size of the source bitmap.
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* \note This function requires also a small buffer bitmap used internally to store
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* intermediate results. This bitmap must have at least an horizontal size in bytes of 2*width*pixel,
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* and a vertical size of 6 rows. The memory of this buffer must not be allocated
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* in video memory because it's also read and not only written. Generally
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* a heap (malloc) or a stack (alloca) buffer is the best choices.
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* \param void_dst Pointer at the first pixel of the destination bitmap.
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* \param dst_slice Size in bytes of a destination bitmap row.
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* \param void_mid Pointer at the first pixel of the buffer bitmap.
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* \param mid_slice Size in bytes of a buffer bitmap row.
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* \param void_src Pointer at the first pixel of the source bitmap.
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* \param src_slice Size in bytes of a source bitmap row.
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* \param pixel Bytes per pixel of the source and destination bitmap.
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* \param width Horizontal size in pixels of the source bitmap.
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* \param height Vertical size in pixels of the source bitmap.
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*/
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static void scale4x_buf(void* void_dst, unsigned dst_slice, void* void_mid, unsigned mid_slice, const void* void_src, unsigned src_slice, unsigned pixel, unsigned width, unsigned height)
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{
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unsigned char* dst = (unsigned char*)void_dst;
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const unsigned char* src = (const unsigned char*)void_src;
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unsigned count;
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unsigned char* mid[6];
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assert(height >= 4);
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count = height;
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/* set the 6 buffer pointers */
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mid[0] = (unsigned char*)void_mid;
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mid[1] = mid[0] + mid_slice;
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mid[2] = mid[1] + mid_slice;
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mid[3] = mid[2] + mid_slice;
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mid[4] = mid[3] + mid_slice;
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mid[5] = mid[4] + mid_slice;
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stage_scale2x(SCMID(-2+6), SCMID(-1+6), SCSRC(0), SCSRC(0), SCSRC(1), pixel, width);
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stage_scale2x(SCMID(0), SCMID(1), SCSRC(0), SCSRC(1), SCSRC(2), pixel, width);
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stage_scale2x(SCMID(2), SCMID(3), SCSRC(1), SCSRC(2), SCSRC(3), pixel, width);
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stage_scale4x(SCDST(0), SCDST(1), SCDST(2), SCDST(3), SCMID(-2+6), SCMID(-2+6), SCMID(-1+6), SCMID(0), pixel, width);
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dst = SCDST(4);
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stage_scale4x(SCDST(0), SCDST(1), SCDST(2), SCDST(3), SCMID(-1+6), SCMID(0), SCMID(1), SCMID(2), pixel, width);
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dst = SCDST(4);
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count -= 4;
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while (count) {
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unsigned char* tmp;
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stage_scale2x(SCMID(4), SCMID(5), SCSRC(2), SCSRC(3), SCSRC(4), pixel, width);
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stage_scale4x(SCDST(0), SCDST(1), SCDST(2), SCDST(3), SCMID(1), SCMID(2), SCMID(3), SCMID(4), pixel, width);
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dst = SCDST(4);
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src = SCSRC(1);
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tmp = SCMID(0); /* shift by 2 position */
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SCMID(0) = SCMID(2);
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SCMID(2) = SCMID(4);
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SCMID(4) = tmp;
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tmp = SCMID(1);
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SCMID(1) = SCMID(3);
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SCMID(3) = SCMID(5);
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SCMID(5) = tmp;
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--count;
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}
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stage_scale2x(SCMID(4), SCMID(5), SCSRC(2), SCSRC(3), SCSRC(3), pixel, width);
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stage_scale4x(SCDST(0), SCDST(1), SCDST(2), SCDST(3), SCMID(1), SCMID(2), SCMID(3), SCMID(4), pixel, width);
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dst = SCDST(4);
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stage_scale4x(SCDST(0), SCDST(1), SCDST(2), SCDST(3), SCMID(3), SCMID(4), SCMID(5), SCMID(5), pixel, width);
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#if defined(__GNUC__) && defined(__i386__)
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scale2x_mmx_emms();
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#endif
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}
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/**
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* Apply the Scale4x effect on a bitmap.
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* The destination bitmap is filled with the scaled version of the source bitmap.
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* The source bitmap isn't modified.
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* The destination bitmap must be manually allocated before calling the function,
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* note that the resulting size is exactly 4x4 times the size of the source bitmap.
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* \note This function operates like ::scale4x_buf() but the intermediate buffer is
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* automatically allocated in the stack.
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* \param void_dst Pointer at the first pixel of the destination bitmap.
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* \param dst_slice Size in bytes of a destination bitmap row.
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* \param void_src Pointer at the first pixel of the source bitmap.
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* \param src_slice Size in bytes of a source bitmap row.
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* \param pixel Bytes per pixel of the source and destination bitmap.
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* \param width Horizontal size in pixels of the source bitmap.
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* \param height Vertical size in pixels of the source bitmap.
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*/
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static void scale4x(void* void_dst, unsigned dst_slice, const void* void_src, unsigned src_slice, unsigned pixel, unsigned width, unsigned height)
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{
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unsigned mid_slice;
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void* mid;
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mid_slice = 2 * pixel * width; /* required space for 1 row buffer */
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mid_slice = (mid_slice + 0x7) & ~0x7; /* align to 8 bytes */
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#if HAVE_ALLOCA
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mid = alloca(6 * mid_slice); /* allocate space for 6 row buffers */
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assert(mid != 0); /* alloca should never fails */
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#else
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mid = malloc(6 * mid_slice); /* allocate space for 6 row buffers */
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if (!mid)
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return;
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#endif
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scale4x_buf(void_dst, dst_slice, mid, mid_slice, void_src, src_slice, pixel, width, height);
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#if !HAVE_ALLOCA
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free(mid);
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#endif
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}
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/**
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* Check if the scale implementation is applicable at the given arguments.
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* \param scale Scale factor. 2, 3 or 4.
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* \param pixel Bytes per pixel of the source and destination bitmap.
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* \param width Horizontal size in pixels of the source bitmap.
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* \param height Vertical size in pixels of the source bitmap.
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* \return
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* - -1 on precondition violated.
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* - 0 on success.
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*/
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int scale_precondition(unsigned scale, unsigned pixel, unsigned width, unsigned height)
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{
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if (scale != 2 && scale != 3 && scale != 4)
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return -1;
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if (pixel != 1 && pixel != 2 && pixel != 4)
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return -1;
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switch (scale) {
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case 2 :
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case 3 :
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if (height < 2)
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return -1;
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break;
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case 4 :
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if (height < 4)
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return -1;
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break;
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}
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#if defined(__GNUC__) && defined(__i386__)
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switch (scale) {
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case 2 :
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case 4 :
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if (width < (16 / pixel))
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return -1;
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if (width % (8 / pixel) != 0)
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return -1;
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break;
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case 3 :
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if (width < 2)
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return -1;
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break;
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}
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#else
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if (width < 2)
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return -1;
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#endif
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return 0;
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}
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/**
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* Apply the Scale effect on a bitmap.
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* This function is simply a common interface for ::scale2x(), ::scale3x() and ::scale4x().
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* \param scale Scale factor. 2, 3 or 4.
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* \param void_dst Pointer at the first pixel of the destination bitmap.
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* \param dst_slice Size in bytes of a destination bitmap row.
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* \param void_src Pointer at the first pixel of the source bitmap.
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* \param src_slice Size in bytes of a source bitmap row.
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* \param pixel Bytes per pixel of the source and destination bitmap.
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* \param width Horizontal size in pixels of the source bitmap.
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* \param height Vertical size in pixels of the source bitmap.
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*/
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void scale(unsigned scale, void* void_dst, unsigned dst_slice, const void* void_src, unsigned src_slice, unsigned pixel, unsigned width, unsigned height)
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{
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switch (scale) {
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case 2 :
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scale2x(void_dst, dst_slice, void_src, src_slice, pixel, width, height);
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break;
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case 3 :
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scale3x(void_dst, dst_slice, void_src, src_slice, pixel, width, height);
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break;
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case 4 :
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scale4x(void_dst, dst_slice, void_src, src_slice, pixel, width, height);
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break;
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}
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}
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