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1.1 ! root 1: /* ! 2: * This file is part of the Scale2x project. ! 3: * ! 4: * Copyright (C) 2001-2003 Andrea Mazzoleni ! 5: * ! 6: * This program is free software; you can redistribute it and/or modify ! 7: * it under the terms of the GNU General Public License as published by ! 8: * the Free Software Foundation; either version 2 of the License, or ! 9: * (at your option) any later version. ! 10: * ! 11: * This program is distributed in the hope that it will be useful, ! 12: * but WITHOUT ANY WARRANTY; without even the implied warranty of ! 13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ! 14: * GNU General Public License for more details. ! 15: * ! 16: * You should have received a copy of the GNU General Public License ! 17: * along with this program; if not, write to the Free Software ! 18: * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. ! 19: */ ! 20: ! 21: /* ! 22: * This file contains a fast C implementation of the Scale3x effect. ! 23: * ! 24: * You can find an high level description of the effect at : ! 25: * ! 26: * http://scale2x.sourceforge.net/ ! 27: * ! 28: * Alternatively at the previous license terms, you are allowed to use this ! 29: * code in your program with these conditions: ! 30: * - the program is not used in commercial activities. ! 31: * - the whole source code of the program is released with the binary. ! 32: * - derivative works of the program are allowed. ! 33: */ ! 34: ! 35: #ifndef __SCALE3X_H ! 36: #define __SCALE3X_H ! 37: ! 38: #include <assert.h> ! 39: ! 40: /***************************************************************************/ ! 41: /* Basic types */ ! 42: ! 43: typedef unsigned char scale3x_uint8; ! 44: typedef unsigned short scale3x_uint16; ! 45: typedef unsigned scale3x_uint32; ! 46: ! 47: /***************************************************************************/ ! 48: /* Scale3x C implementation */ ! 49: ! 50: static void scale3x_8_def_single(scale3x_uint8* dst, const scale3x_uint8* src0, const scale3x_uint8* src1, const scale3x_uint8* src2, unsigned count) ! 51: { ! 52: assert(count >= 2); ! 53: ! 54: /* first pixel */ ! 55: dst[0] = src1[0]; ! 56: dst[1] = src1[0]; ! 57: if (src1[1] == src0[0] && src2[0] != src0[0]) ! 58: dst[2] = src0[0]; ! 59: else ! 60: dst[2] = src1[0]; ! 61: ++src0; ! 62: ++src1; ! 63: ++src2; ! 64: dst += 3; ! 65: ! 66: /* central pixels */ ! 67: count -= 2; ! 68: while (count) { ! 69: if (src1[-1] == src0[0] && src2[0] != src0[0] && src1[1] != src0[0]) ! 70: dst[0] = src0[0]; ! 71: else ! 72: dst[0] = src1[0]; ! 73: dst[1] = src1[0]; ! 74: if (src1[1] == src0[0] && src2[0] != src0[0] && src1[-1] != src0[0]) ! 75: dst[2] = src0[0]; ! 76: else ! 77: dst[2] = src1[0]; ! 78: ! 79: ++src0; ! 80: ++src1; ! 81: ++src2; ! 82: ! 83: dst += 3; ! 84: --count; ! 85: } ! 86: ! 87: /* last pixel */ ! 88: if (src1[-1] == src0[0] && src2[0] != src0[0]) ! 89: dst[0] = src0[0]; ! 90: else ! 91: dst[0] = src1[0]; ! 92: dst[1] = src1[0]; ! 93: dst[2] = src1[0]; ! 94: } ! 95: ! 96: static void scale3x_8_def_fill(scale3x_uint8* dst, const scale3x_uint8* src, unsigned count) ! 97: { ! 98: while (count) { ! 99: dst[0] = src[0]; ! 100: dst[1] = src[0]; ! 101: dst[2] = src[0]; ! 102: ! 103: ++src; ! 104: dst += 3; ! 105: --count; ! 106: } ! 107: } ! 108: ! 109: static void scale3x_16_def_single(scale3x_uint16* dst, const scale3x_uint16* src0, const scale3x_uint16* src1, const scale3x_uint16* src2, unsigned count) ! 110: { ! 111: assert(count >= 2); ! 112: ! 113: /* first pixel */ ! 114: dst[0] = src1[0]; ! 115: dst[1] = src1[0]; ! 116: if (src1[1] == src0[0] && src2[0] != src0[0]) ! 117: dst[2] = src0[0]; ! 118: else ! 119: dst[2] = src1[0]; ! 120: ++src0; ! 121: ++src1; ! 122: ++src2; ! 123: dst += 3; ! 124: ! 125: /* central pixels */ ! 126: count -= 2; ! 127: while (count) { ! 128: if (src1[-1] == src0[0] && src2[0] != src0[0] && src1[1] != src0[0]) ! 129: dst[0] = src0[0]; ! 130: else ! 131: dst[0] = src1[0]; ! 132: dst[1] = src1[0]; ! 133: if (src1[1] == src0[0] && src2[0] != src0[0] && src1[-1] != src0[0]) ! 134: dst[2] = src0[0]; ! 135: else ! 136: dst[2] = src1[0]; ! 137: ! 138: ++src0; ! 139: ++src1; ! 140: ++src2; ! 141: ! 142: dst += 3; ! 143: --count; ! 144: } ! 145: ! 146: /* last pixel */ ! 147: if (src1[-1] == src0[0] && src2[0] != src0[0]) ! 148: dst[0] = src0[0]; ! 149: else ! 150: dst[0] = src1[0]; ! 151: dst[1] = src1[0]; ! 152: dst[2] = src1[0]; ! 153: } ! 154: ! 155: static void scale3x_16_def_fill(scale3x_uint16* dst, const scale3x_uint16* src, unsigned count) ! 156: { ! 157: while (count) { ! 158: dst[0] = src[0]; ! 159: dst[1] = src[0]; ! 160: dst[2] = src[0]; ! 161: ! 162: ++src; ! 163: dst += 3; ! 164: --count; ! 165: } ! 166: } ! 167: ! 168: static void scale3x_32_def_single(scale3x_uint32* dst, const scale3x_uint32* src0, const scale3x_uint32* src1, const scale3x_uint32* src2, unsigned count) ! 169: { ! 170: assert(count >= 2); ! 171: ! 172: /* first pixel */ ! 173: dst[0] = src1[0]; ! 174: dst[1] = src1[0]; ! 175: if (src1[1] == src0[0] && src2[0] != src0[0]) ! 176: dst[2] = src0[0]; ! 177: else ! 178: dst[2] = src1[0]; ! 179: ++src0; ! 180: ++src1; ! 181: ++src2; ! 182: dst += 3; ! 183: ! 184: /* central pixels */ ! 185: count -= 2; ! 186: while (count) { ! 187: if (src1[-1] == src0[0] && src2[0] != src0[0] && src1[1] != src0[0]) ! 188: dst[0] = src0[0]; ! 189: else ! 190: dst[0] = src1[0]; ! 191: dst[1] = src1[0]; ! 192: if (src1[1] == src0[0] && src2[0] != src0[0] && src1[-1] != src0[0]) ! 193: dst[2] = src0[0]; ! 194: else ! 195: dst[2] = src1[0]; ! 196: ! 197: ++src0; ! 198: ++src1; ! 199: ++src2; ! 200: ! 201: dst += 3; ! 202: --count; ! 203: } ! 204: ! 205: /* last pixel */ ! 206: if (src1[-1] == src0[0] && src2[0] != src0[0]) ! 207: dst[0] = src0[0]; ! 208: else ! 209: dst[0] = src1[0]; ! 210: dst[1] = src1[0]; ! 211: dst[2] = src1[0]; ! 212: } ! 213: ! 214: static void scale3x_32_def_fill(scale3x_uint32* dst, const scale3x_uint32* src, unsigned count) ! 215: { ! 216: while (count) { ! 217: dst[0] = src[0]; ! 218: dst[1] = src[0]; ! 219: dst[2] = src[0]; ! 220: ! 221: ++src; ! 222: dst += 3; ! 223: --count; ! 224: } ! 225: } ! 226: ! 227: /** ! 228: * Scale by a factor of 3 a row of pixels of 8 bits. ! 229: * The function is implemented in C. ! 230: * The pixels over the left and right borders are assumed of the same color of ! 231: * the pixels on the border. ! 232: * \param src0 Pointer at the first pixel of the previous row. ! 233: * \param src1 Pointer at the first pixel of the current row. ! 234: * \param src2 Pointer at the first pixel of the next row. ! 235: * \param count Length in pixels of the src0, src1 and src2 rows. ! 236: * It must be at least 2. ! 237: * \param dst0 First destination row, triple length in pixels. ! 238: * \param dst1 Second destination row, triple length in pixels. ! 239: * \param dst2 Third destination row, triple length in pixels. ! 240: */ ! 241: static inline 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) ! 242: { ! 243: assert(count >= 2); ! 244: ! 245: scale3x_8_def_single(dst0, src0, src1, src2, count); ! 246: scale3x_8_def_fill(dst1, src1, count); ! 247: scale3x_8_def_single(dst2, src2, src1, src0, count); ! 248: } ! 249: ! 250: /** ! 251: * Scale by a factor of 3 a row of pixels of 16 bits. ! 252: * This function operates like scale3x_8_def() but for 16 bits pixels. ! 253: * \param src0 Pointer at the first pixel of the previous row. ! 254: * \param src1 Pointer at the first pixel of the current row. ! 255: * \param src2 Pointer at the first pixel of the next row. ! 256: * \param count Length in pixels of the src0, src1 and src2 rows. ! 257: * It must be at least 2. ! 258: * \param dst0 First destination row, triple length in pixels. ! 259: * \param dst1 Second destination row, triple length in pixels. ! 260: * \param dst2 Third destination row, triple length in pixels. ! 261: */ ! 262: static inline 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) ! 263: { ! 264: assert(count >= 2); ! 265: ! 266: scale3x_16_def_single(dst0, src0, src1, src2, count); ! 267: scale3x_16_def_fill(dst1, src1, count); ! 268: scale3x_16_def_single(dst2, src2, src1, src0, count); ! 269: } ! 270: ! 271: /** ! 272: * Scale by a factor of 3 a row of pixels of 32 bits. ! 273: * This function operates like scale3x_8_def() but for 32 bits pixels. ! 274: * \param src0 Pointer at the first pixel of the previous row. ! 275: * \param src1 Pointer at the first pixel of the current row. ! 276: * \param src2 Pointer at the first pixel of the next row. ! 277: * \param count Length in pixels of the src0, src1 and src2 rows. ! 278: * It must be at least 2. ! 279: * \param dst0 First destination row, triple length in pixels. ! 280: * \param dst1 Second destination row, triple length in pixels. ! 281: * \param dst2 Third destination row, triple length in pixels. ! 282: */ ! 283: static inline 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) ! 284: { ! 285: assert(count >= 2); ! 286: ! 287: scale3x_32_def_single(dst0, src0, src1, src2, count); ! 288: scale3x_32_def_fill(dst1, src1, count); ! 289: scale3x_32_def_single(dst2, src2, src1, src0, count); ! 290: } ! 291: ! 292: #endif
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