diff options
Diffstat (limited to 'kopete/protocols/msn/webcam/libmimic/colorspace.c')
| -rw-r--r-- | kopete/protocols/msn/webcam/libmimic/colorspace.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/kopete/protocols/msn/webcam/libmimic/colorspace.c b/kopete/protocols/msn/webcam/libmimic/colorspace.c new file mode 100644 index 00000000..27de4a09 --- /dev/null +++ b/kopete/protocols/msn/webcam/libmimic/colorspace.c @@ -0,0 +1,161 @@ +/* Copyright (C) 2005 Ole André Vadla Ravnås <oleavr@gmail.com> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "mimic-private.h" + +#define RED_INDEX_1 0 +#define GREEN_INDEX_1 1 +#define BLUE_INDEX_1 2 + +#define RED_INDEX_2 3 +#define GREEN_INDEX_2 4 +#define BLUE_INDEX_2 5 + +/* + * _rgb_to_yuv + * + * Internal helper-function used to convert an image + * from RGB 24-bpp packed-pixel to YUV420 planar. + */ +void _rgb_to_yuv(const guchar *input_rgb, + guchar *output_y, + guchar *output_cb, + guchar *output_cr, + gint width, + gint height) +{ + gint y, x; + + for (y = 0; y < height; y += 2) { + + const guchar *src1, *src2; + guchar *dst1, *dst2, *dst3, *dst4; + gint num_cols; + + src1 = input_rgb + ((height - 1 - y) * width * 3); + src2 = input_rgb + ((height - 2 - y) * width * 3); + + dst1 = output_y + (y * width); + dst2 = output_y + ((y + 1) * width); + dst3 = output_cb + ((y / 2) * (width / 2)); + dst4 = output_cr + ((y / 2) * (width / 2)); + + num_cols = width / 2; + + for (x = 0; x < num_cols; x++) { + + gint expr1, expr2, expr3, expr4, expr5, v; + + expr1 = (src1[BLUE_INDEX_1] * 19595) + (src1[GREEN_INDEX_1] * 38470) + (src1[RED_INDEX_1] * 7471); + expr2 = (src1[BLUE_INDEX_2] * 19595) + (src1[GREEN_INDEX_2] * 38470) + (src1[RED_INDEX_2] * 7471); + expr3 = (src2[BLUE_INDEX_1] * 19595) + (src2[GREEN_INDEX_1] * 38470) + (src2[RED_INDEX_1] * 7471); + expr4 = (src2[BLUE_INDEX_2] * 19595) + (src2[GREEN_INDEX_2] * 38470) + (src2[RED_INDEX_2] * 7471); + + expr5 = expr1 + expr2 + expr3 + expr4; + + dst1[0] = expr1 >> 16; + dst1[1] = expr2 >> 16; + dst2[0] = expr3 >> 16; + dst2[1] = expr4 >> 16; + + v = (((src1[BLUE_INDEX_1] + src1[BLUE_INDEX_2] + src2[BLUE_INDEX_1] + src2[BLUE_INDEX_2]) << 16) - expr5 + 131071) >> 16; + dst3[0] = _clamp_value(((v * 57475) >> 18) + 128); + + v = (((src1[RED_INDEX_1] + src1[RED_INDEX_2] + src2[RED_INDEX_1] + src2[RED_INDEX_2]) << 16) - expr5 + 131071) >> 16; + dst4[0] = ((v * 32244) >> 18) + 128; + + src1 += 6; + src2 += 6; + + dst1 += 2; + dst2 += 2; + dst3++; + dst4++; + + } + + } + +} + +/* + * _yuv_to_rgb + * + * Internal helper-function used to convert an image + * from YUV420 planar to RGB 24-bpp packed-pixel. + */ +void _yuv_to_rgb(const guchar *input_y, + const guchar *input_cb, + const guchar *input_cr, + guchar *output_rgb, + guint width, + guint height) +{ + const guchar *src_y, *src_cb, *src_cr; + guchar *dst_rgb; + guint i, j, rgb_stride; + + src_y = input_y; + src_cb = input_cb; + src_cr = input_cr; + + rgb_stride = width * 3; + dst_rgb = output_rgb + (rgb_stride * (height - 1)); + + for (i = 0; i < height; i++) { + const guchar *p_y, *p_cb, *p_cr; + guchar *p_rgb; + + p_y = src_y; + p_cb = src_cb; + p_cr = src_cr; + + p_rgb = dst_rgb; + + for (j = 0; j < width; j++) { + gint v; + + v = ((p_y[0] * 65536) + ((p_cr[0] - 128) * 133169)) / 65536; + p_rgb[0] = _clamp_value(v); + + v = ((p_y[0] * 65536) - ((p_cr[0] - 128) * 25821) - ((p_cb[0] - 128) * 38076)) / 65536; + p_rgb[1] = _clamp_value(v); + + v = ((p_y[0] * 65536) + ((p_cb[0] - 128) * 74711)) / 65536; + p_rgb[2] = _clamp_value(v); + + p_y++; + if ((j + 1) % 2 == 0) { + p_cb++; + p_cr++; + } + + p_rgb += 3; + } + + src_y += width; + if ((i + 1) % 2 == 0) { + src_cb += (width + 1) / 2; + src_cr += (width + 1) / 2; + } + + dst_rgb -= rgb_stride; + + } + +} + |