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author | Max Horn | 2004-08-07 16:04:43 +0000 |
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committer | Max Horn | 2004-08-07 16:04:43 +0000 |
commit | 2a9c6f6d5f5d3ee5a4218cd2da765b34345c33d8 (patch) | |
tree | 44a317428c913e5edc464c252886d03fbb612206 /common/scaler/scale3x.cpp | |
parent | d88a9c21d6ba47776c059037f11d9112752c11e1 (diff) | |
download | scummvm-rg350-2a9c6f6d5f5d3ee5a4218cd2da765b34345c33d8.tar.gz scummvm-rg350-2a9c6f6d5f5d3ee5a4218cd2da765b34345c33d8.tar.bz2 scummvm-rg350-2a9c6f6d5f5d3ee5a4218cd2da765b34345c33d8.zip |
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
Diffstat (limited to 'common/scaler/scale3x.cpp')
-rw-r--r-- | common/scaler/scale3x.cpp | 386 |
1 files changed, 386 insertions, 0 deletions
diff --git a/common/scaler/scale3x.cpp b/common/scaler/scale3x.cpp new file mode 100644 index 0000000000..16e484d02b --- /dev/null +++ b/common/scaler/scale3x.cpp @@ -0,0 +1,386 @@ +/* + * This file is part of the Scale2x project. + * + * Copyright (C) 2001, 2002, 2003, 2004 Andrea Mazzoleni + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +/* + * This file contains a C and MMX implementation of the Scale2x effect. + * + * You can find an high level description of the effect at : + * + * http://scale2x.sourceforge.net/ + * + * Alternatively at the previous license terms, you are allowed to use this + * code in your program with these conditions: + * - the program is not used in commercial activities. + * - the whole source code of the program is released with the binary. + * - derivative works of the program are allowed. + */ + +#if HAVE_CONFIG_H +#include <config.h> +#endif + +#include "scale3x.h" + +#include <assert.h> + +/***************************************************************************/ +/* Scale3x C implementation */ + +static inline void scale3x_8_def_border(scale3x_uint8* __restrict__ dst, const scale3x_uint8* __restrict__ src0, const scale3x_uint8* __restrict__ src1, const scale3x_uint8* __restrict__ src2, unsigned count) +{ + assert(count >= 2); + + /* first pixel */ + dst[0] = src1[0]; + dst[1] = src1[0]; + if (src1[1] == src0[0] && src2[0] != src0[0]) + dst[2] = src0[0]; + else + dst[2] = src1[0]; + ++src0; + ++src1; + ++src2; + dst += 3; + + /* central pixels */ + count -= 2; + while (count) { + if (src0[0] != src2[0] && src1[-1] != src1[1]) { + dst[0] = src1[-1] == src0[0] ? src1[-1] : src1[0]; + dst[1] = (src1[-1] == src0[0] && src1[0] != src0[1]) || (src1[1] == src0[0] && src1[0] != src0[-1]) ? src0[0] : src1[0]; + dst[2] = src1[1] == src0[0] ? src1[1] : src1[0]; + } else { + dst[0] = src1[0]; + dst[1] = src1[0]; + dst[2] = src1[0]; + } + + ++src0; + ++src1; + ++src2; + dst += 3; + --count; + } + + /* last pixel */ + if (src1[-1] == src0[0] && src2[0] != src0[0]) + dst[0] = src0[0]; + else + dst[0] = src1[0]; + dst[1] = src1[0]; + dst[2] = src1[0]; +} + +static inline void scale3x_8_def_center(scale3x_uint8* __restrict__ dst, const scale3x_uint8* __restrict__ src0, const scale3x_uint8* __restrict__ src1, const scale3x_uint8* __restrict__ src2, unsigned count) +{ + assert(count >= 2); + + /* first pixel */ + dst[0] = src1[0]; + dst[1] = src1[0]; + if (src0[0] != src2[0]) { + dst[2] = (src1[1] == src0[0] && src1[0] != src2[1]) || (src1[1] == src2[0] && src1[0] != src0[1]) ? src1[1] : src1[0]; + } else { + dst[2] = src1[0]; + } + ++src0; + ++src1; + ++src2; + dst += 3; + + /* central pixels */ + count -= 2; + while (count) { + if (src0[0] != src2[0] && src1[-1] != src1[1]) { + dst[0] = (src1[-1] == src0[0] && src1[0] != src2[-1]) || (src1[-1] == src2[0] && src1[0] != src0[-1]) ? src1[-1] : src1[0]; + dst[1] = src1[0]; + dst[2] = (src1[1] == src0[0] && src1[0] != src2[1]) || (src1[1] == src2[0] && src1[0] != src0[1]) ? src1[1] : src1[0]; + } else { + dst[0] = src1[0]; + dst[1] = src1[0]; + dst[2] = src1[0]; + } + + ++src0; + ++src1; + ++src2; + dst += 3; + --count; + } + + /* last pixel */ + if (src0[0] != src2[0]) { + dst[0] = (src1[-1] == src0[0] && src1[0] != src2[-1]) || (src1[-1] == src2[0] && src1[0] != src0[-1]) ? src1[-1] : src1[0]; + } else { + dst[0] = src1[0]; + } + dst[1] = src1[0]; + dst[2] = src1[0]; +} + +static inline void scale3x_16_def_border(scale3x_uint16* __restrict__ dst, const scale3x_uint16* __restrict__ src0, const scale3x_uint16* __restrict__ src1, const scale3x_uint16* __restrict__ src2, unsigned count) +{ + assert(count >= 2); + + /* first pixel */ + dst[0] = src1[0]; + dst[1] = src1[0]; + if (src1[1] == src0[0] && src2[0] != src0[0]) + dst[2] = src0[0]; + else + dst[2] = src1[0]; + ++src0; + ++src1; + ++src2; + dst += 3; + + /* central pixels */ + count -= 2; + while (count) { + if (src0[0] != src2[0] && src1[-1] != src1[1]) { + dst[0] = src1[-1] == src0[0] ? src1[-1] : src1[0]; + dst[1] = (src1[-1] == src0[0] && src1[0] != src0[1]) || (src1[1] == src0[0] && src1[0] != src0[-1]) ? src0[0] : src1[0]; + dst[2] = src1[1] == src0[0] ? src1[1] : src1[0]; + } else { + dst[0] = src1[0]; + dst[1] = src1[0]; + dst[2] = src1[0]; + } + + ++src0; + ++src1; + ++src2; + dst += 3; + --count; + } + + /* last pixel */ + if (src1[-1] == src0[0] && src2[0] != src0[0]) + dst[0] = src0[0]; + else + dst[0] = src1[0]; + dst[1] = src1[0]; + dst[2] = src1[0]; +} + +static inline void scale3x_16_def_center(scale3x_uint16* __restrict__ dst, const scale3x_uint16* __restrict__ src0, const scale3x_uint16* __restrict__ src1, const scale3x_uint16* __restrict__ src2, unsigned count) +{ + assert(count >= 2); + + /* first pixel */ + dst[0] = src1[0]; + dst[1] = src1[0]; + if (src0[0] != src2[0]) { + dst[2] = (src1[1] == src0[0] && src1[0] != src2[1]) || (src1[1] == src2[0] && src1[0] != src0[1]) ? src1[1] : src1[0]; + } else { + dst[2] = src1[0]; + } + ++src0; + ++src1; + ++src2; + dst += 3; + + /* central pixels */ + count -= 2; + while (count) { + if (src0[0] != src2[0] && src1[-1] != src1[1]) { + dst[0] = (src1[-1] == src0[0] && src1[0] != src2[-1]) || (src1[-1] == src2[0] && src1[0] != src0[-1]) ? src1[-1] : src1[0]; + dst[1] = src1[0]; + dst[2] = (src1[1] == src0[0] && src1[0] != src2[1]) || (src1[1] == src2[0] && src1[0] != src0[1]) ? src1[1] : src1[0]; + } else { + dst[0] = src1[0]; + dst[1] = src1[0]; + dst[2] = src1[0]; + } + + ++src0; + ++src1; + ++src2; + dst += 3; + --count; + } + + /* last pixel */ + if (src0[0] != src2[0]) { + dst[0] = (src1[-1] == src0[0] && src1[0] != src2[-1]) || (src1[-1] == src2[0] && src1[0] != src0[-1]) ? src1[-1] : src1[0]; + } else { + dst[0] = src1[0]; + } + dst[1] = src1[0]; + dst[2] = src1[0]; +} + +static inline void scale3x_32_def_border(scale3x_uint32* __restrict__ dst, const scale3x_uint32* __restrict__ src0, const scale3x_uint32* __restrict__ src1, const scale3x_uint32* __restrict__ src2, unsigned count) +{ + assert(count >= 2); + + /* first pixel */ + dst[0] = src1[0]; + dst[1] = src1[0]; + if (src1[1] == src0[0] && src2[0] != src0[0]) + dst[2] = src0[0]; + else + dst[2] = src1[0]; + ++src0; + ++src1; + ++src2; + dst += 3; + + /* central pixels */ + count -= 2; + while (count) { + if (src0[0] != src2[0] && src1[-1] != src1[1]) { + dst[0] = src1[-1] == src0[0] ? src1[-1] : src1[0]; + dst[1] = (src1[-1] == src0[0] && src1[0] != src0[1]) || (src1[1] == src0[0] && src1[0] != src0[-1]) ? src0[0] : src1[0]; + dst[2] = src1[1] == src0[0] ? src1[1] : src1[0]; + } else { + dst[0] = src1[0]; + dst[1] = src1[0]; + dst[2] = src1[0]; + } + + ++src0; + ++src1; + ++src2; + dst += 3; + --count; + } + + /* last pixel */ + if (src1[-1] == src0[0] && src2[0] != src0[0]) + dst[0] = src0[0]; + else + dst[0] = src1[0]; + dst[1] = src1[0]; + dst[2] = src1[0]; +} + +static inline void scale3x_32_def_center(scale3x_uint32* __restrict__ dst, const scale3x_uint32* __restrict__ src0, const scale3x_uint32* __restrict__ src1, const scale3x_uint32* __restrict__ src2, unsigned count) +{ + assert(count >= 2); + + /* first pixel */ + dst[0] = src1[0]; + dst[1] = src1[0]; + if (src0[0] != src2[0]) { + dst[2] = (src1[1] == src0[0] && src1[0] != src2[1]) || (src1[1] == src2[0] && src1[0] != src0[1]) ? src1[1] : src1[0]; + } else { + dst[2] = src1[0]; + } + ++src0; + ++src1; + ++src2; + dst += 3; + + /* central pixels */ + count -= 2; + while (count) { + if (src0[0] != src2[0] && src1[-1] != src1[1]) { + dst[0] = (src1[-1] == src0[0] && src1[0] != src2[-1]) || (src1[-1] == src2[0] && src1[0] != src0[-1]) ? src1[-1] : src1[0]; + dst[1] = src1[0]; + dst[2] = (src1[1] == src0[0] && src1[0] != src2[1]) || (src1[1] == src2[0] && src1[0] != src0[1]) ? src1[1] : src1[0]; + } else { + dst[0] = src1[0]; + dst[1] = src1[0]; + dst[2] = src1[0]; + } + + ++src0; + ++src1; + ++src2; + dst += 3; + --count; + } + + /* last pixel */ + if (src0[0] != src2[0]) { + dst[0] = (src1[-1] == src0[0] && src1[0] != src2[-1]) || (src1[-1] == src2[0] && src1[0] != src0[-1]) ? src1[-1] : src1[0]; + } else { + dst[0] = src1[0]; + } + dst[1] = src1[0]; + dst[2] = src1[0]; +} + +/** + * Scale by a factor of 3 a row of pixels of 8 bits. + * The function is implemented in C. + * The pixels over the left and right borders are assumed of the same color of + * the pixels on the border. + * \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 2. + * \param dst0 First destination row, triple length in pixels. + * \param dst1 Second destination row, triple length in pixels. + * \param dst2 Third destination row, triple length in pixels. + */ +void scale3x_8_def(scale3x_uint8* dst0, scale3x_uint8* dst1, scale3x_uint8* dst2, const scale3x_uint8* src0, const scale3x_uint8* src1, const scale3x_uint8* src2, unsigned count) +{ + assert(count >= 2); + + scale3x_8_def_border(dst0, src0, src1, src2, count); + scale3x_8_def_center(dst1, src0, src1, src2, count); + scale3x_8_def_border(dst2, src2, src1, src0, count); +} + +/** + * Scale by a factor of 3 a row of pixels of 16 bits. + * This function operates like scale3x_8_def() but for 16 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 2. + * \param dst0 First destination row, triple length in pixels. + * \param dst1 Second destination row, triple length in pixels. + * \param dst2 Third destination row, triple length in pixels. + */ +void scale3x_16_def(scale3x_uint16* dst0, scale3x_uint16* dst1, scale3x_uint16* dst2, const scale3x_uint16* src0, const scale3x_uint16* src1, const scale3x_uint16* src2, unsigned count) +{ + assert(count >= 2); + + scale3x_16_def_border(dst0, src0, src1, src2, count); + scale3x_16_def_center(dst1, src0, src1, src2, count); + scale3x_16_def_border(dst2, src2, src1, src0, count); +} + +/** + * Scale by a factor of 3 a row of pixels of 32 bits. + * This function operates like scale3x_8_def() 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 2. + * \param dst0 First destination row, triple length in pixels. + * \param dst1 Second destination row, triple length in pixels. + * \param dst2 Third destination row, triple length in pixels. + */ +void scale3x_32_def(scale3x_uint32* dst0, scale3x_uint32* dst1, scale3x_uint32* dst2, const scale3x_uint32* src0, const scale3x_uint32* src1, const scale3x_uint32* src2, unsigned count) +{ + assert(count >= 2); + + scale3x_32_def_border(dst0, src0, src1, src2, count); + scale3x_32_def_center(dst1, src0, src1, src2, count); + scale3x_32_def_border(dst2, src2, src1, src0, count); +} + |