| 1 | /* |
| 2 | * Copyright (C) 2001-2011 Michael Niedermayer <michaelni@gmx.at> |
| 3 | * |
| 4 | * This file is part of FFmpeg. |
| 5 | * |
| 6 | * FFmpeg is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2.1 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * FFmpeg 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 GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with FFmpeg; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | */ |
| 20 | |
| 21 | #include "swscale_internal.h" |
| 22 | |
| 23 | void ff_hyscale_fast_c(SwsContext *c, int16_t *dst, int dstWidth, |
| 24 | const uint8_t *src, int srcW, int xInc) |
| 25 | { |
| 26 | int i; |
| 27 | unsigned int xpos = 0; |
| 28 | for (i = 0; i < dstWidth; i++) { |
| 29 | register unsigned int xx = xpos >> 16; |
| 30 | register unsigned int xalpha = (xpos & 0xFFFF) >> 9; |
| 31 | dst[i] = (src[xx] << 7) + (src[xx + 1] - src[xx]) * xalpha; |
| 32 | xpos += xInc; |
| 33 | } |
| 34 | for (i=dstWidth-1; (i*xInc)>>16 >=srcW-1; i--) |
| 35 | dst[i] = src[srcW-1]*128; |
| 36 | } |
| 37 | |
| 38 | void ff_hcscale_fast_c(SwsContext *c, int16_t *dst1, int16_t *dst2, |
| 39 | int dstWidth, const uint8_t *src1, |
| 40 | const uint8_t *src2, int srcW, int xInc) |
| 41 | { |
| 42 | int i; |
| 43 | unsigned int xpos = 0; |
| 44 | for (i = 0; i < dstWidth; i++) { |
| 45 | register unsigned int xx = xpos >> 16; |
| 46 | register unsigned int xalpha = (xpos & 0xFFFF) >> 9; |
| 47 | dst1[i] = (src1[xx] * (xalpha ^ 127) + src1[xx + 1] * xalpha); |
| 48 | dst2[i] = (src2[xx] * (xalpha ^ 127) + src2[xx + 1] * xalpha); |
| 49 | xpos += xInc; |
| 50 | } |
| 51 | for (i=dstWidth-1; (i*xInc)>>16 >=srcW-1; i--) { |
| 52 | dst1[i] = src1[srcW-1]*128; |
| 53 | dst2[i] = src2[srcW-1]*128; |
| 54 | } |
| 55 | } |