| /* im_LabQ2LabS |
| * |
| * 17/11/93 JC |
| * - adapted from im_LabQ2Lab() |
| * 16/11/94 JC |
| * - uses new im_wrap_oneonebuf() fn |
| * 9/2/95 JC |
| * - new im_wrapone function |
| * 2/11/09 |
| * - gtkdoc |
| */ |
| |
| /* |
| |
| This file is part of VIPS. |
| |
| VIPS 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 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 Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| |
| */ |
| |
| /* |
| |
| These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk |
| |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include <config.h> |
| #endif /*HAVE_CONFIG_H*/ |
| #include <vips/intl.h> |
| |
| #include <stdio.h> |
| |
| #include <vips/vips.h> |
| |
| #ifdef WITH_DMALLOC |
| #include <dmalloc.h> |
| #endif /*WITH_DMALLOC*/ |
| |
| /* CONVERT n pels from packed 32bit Lab to signed short. |
| */ |
| void |
| imb_LabQ2LabS( unsigned char *in, signed short *out, int n ) |
| { |
| int c; |
| unsigned char *p = in; |
| unsigned char ext; |
| signed short *q = out; |
| signed short l, a, b; |
| |
| for( c = 0; c < n; c++ ) { |
| /* Get most significant 8 bits of lab. |
| */ |
| l = p[0] << 7; |
| a = p[1] << 8; |
| b = p[2] << 8; |
| |
| /* Get x-tra bits. |
| */ |
| ext = p[3]; |
| p += 4; |
| |
| /* Shift and mask in to lab. |
| */ |
| l |= (unsigned char) (ext & 0xc0) >> 1; |
| a |= (ext & 0x38) << 2; |
| b |= (ext & 0x7) << 5; |
| |
| /* Write! |
| */ |
| q[0] = l; |
| q[1] = a; |
| q[2] = b; |
| q += 3; |
| } |
| } |
| |
| /** |
| * im_LabQ2LabS: |
| * @in: input image |
| * @out: output image |
| * |
| * Unpack a LabQ (#IM_CODING_LABQ) image to a three-band signed short image. |
| * |
| * See also: im_LabS2LabQ(), im_LabQ2Lab(), im_rad2float(). |
| * |
| * Returns: 0 on success, -1 on error. |
| */ |
| int |
| im_LabQ2LabS( IMAGE *in, IMAGE *out ) |
| { |
| if( im_check_coding_labq( "im_LabQ2LabS", in ) ) |
| return( -1 ); |
| |
| /* set up output image |
| */ |
| if( im_cp_desc( out, in ) ) |
| return( -1 ); |
| out->Bands = 3; |
| out->Type = IM_TYPE_LABS; |
| out->BandFmt = IM_BANDFMT_SHORT; |
| out->Coding = IM_CODING_NONE; |
| |
| /* Produce output. |
| */ |
| if( im_wrapone( in, out, |
| (im_wrapone_fn) imb_LabQ2LabS, NULL, NULL ) ) |
| return( -1 ); |
| |
| return( 0 ); |
| } |