104 lines
2.6 KiB
C
104 lines
2.6 KiB
C
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/* quirc -- QR-code recognition library
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* Copyright (C) 2010-2012 Daniel Beer <dlbeer@gmail.com>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "convert.h"
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#define CHANNEL_CLAMP(dst, tmp, lum, chrom) \
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(tmp) = ((lum) + (chrom)) >> 8; \
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if ((tmp) < 0) \
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(tmp) = 0; \
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if ((tmp) > 255) \
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(tmp) = 255; \
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(dst) = (tmp);
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void yuyv_to_rgb32(const uint8_t *src, int src_pitch,
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int w, int h,
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uint8_t *dst, int dst_pitch)
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{
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int y;
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for (y = 0; y < h; y++) {
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int x;
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const uint8_t *srow = src + y * src_pitch;
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uint8_t *drow = dst + y * dst_pitch;
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for (x = 0; x < w; x += 2) {
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/* ITU-R colorspace assumed */
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int y0 = (int)srow[0] * 256;
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int y1 = (int)srow[2] * 256;
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int cr = (int)srow[3] - 128;
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int cb = (int)srow[1] - 128;
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int r = cr * 359;
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int g = -cb * 88 - 128 * cr;
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int b = 454 * cb;
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int z;
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CHANNEL_CLAMP(drow[0], z, y0, b);
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CHANNEL_CLAMP(drow[1], z, y0, g);
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CHANNEL_CLAMP(drow[2], z, y0, r);
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CHANNEL_CLAMP(drow[4], z, y1, b);
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CHANNEL_CLAMP(drow[5], z, y1, g);
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CHANNEL_CLAMP(drow[6], z, y1, r);
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srow += 4;
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drow += 8;
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}
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}
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}
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void yuyv_to_luma(const uint8_t *src, int src_pitch,
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int w, int h,
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uint8_t *dst, int dst_pitch)
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{
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int y;
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for (y = 0; y < h; y++) {
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int x;
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const uint8_t *srow = src + y * src_pitch;
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uint8_t *drow = dst + y * dst_pitch;
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for (x = 0; x < w; x += 2) {
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*(drow++) = srow[0];
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*(drow++) = srow[2];
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srow += 4;
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}
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}
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}
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void rgb32_to_luma(const uint8_t *src, int src_pitch,
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int w, int h,
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uint8_t *dst, int dst_pitch)
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{
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int y;
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for (y = 0; y < h; y++) {
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const uint8_t *rgb32 = src + src_pitch * y;
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uint8_t *gray = dst + y * dst_pitch;
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int i;
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for (i = 0; i < w; i++) {
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/* ITU-R colorspace assumed */
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int r = (int)rgb32[2];
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int g = (int)rgb32[1];
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int b = (int)rgb32[0];
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int sum = r * 59 + g * 150 + b * 29;
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*(gray++) = sum >> 8;
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rgb32 += 4;
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}
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}
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}
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