331 lines
10 KiB
C
331 lines
10 KiB
C
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/* $Xorg: PsImageUtil.c,v 1.1 2005/03/25 1:19:56 gisburn Exp $ */
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/*
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Copyright (c) 2005 Roland Mainz <roland.mainz@nrubsig.org>
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the names of the copyright holders shall
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not be used in advertising or otherwise to promote the sale, use or other
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dealings in this Software without prior written authorization from said
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copyright holders.
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*/
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/* Please do not beat me for this ugly code - most of it has been stolen from
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* xc/lib/X11/ImUtil.c */
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#ifdef HAVE_DIX_CONFIG_H
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#include <dix-config.h>
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#endif
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#include "Ps.h"
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#include "gcstruct.h"
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#include "windowstr.h"
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#include "servermd.h"
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#include "attributes.h"
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static unsigned char const _reverse_byte[0x100] = {
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0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
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0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
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0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
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0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
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0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
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0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
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0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
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0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
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0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
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0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
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0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
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0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
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0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
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0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
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0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
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0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
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0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
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0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
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0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
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0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
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0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
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0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
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0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
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0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
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0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
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0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
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0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
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0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
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0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
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0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
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0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
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0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
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};
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static
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int XReverse_Bytes(
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register unsigned char *bpt,
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register int nb)
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{
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do {
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*bpt = _reverse_byte[*bpt];
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bpt++;
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} while (--nb > 0);
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return 0;
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}
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/*
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* Data structure for "image" data, used by image manipulation routines.
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*/
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typedef struct {
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int width, height; /* size of image */
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int xoffset; /* number of pixels offset in X direction */
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int format; /* XYBitmap, XYPixmap, ZPixmap */
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char *data; /* pointer to image data */
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int byte_order; /* data byte order, LSBFirst, MSBFirst */
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int bitmap_unit; /* quant. of scanline 8, 16, 32 */
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int bitmap_bit_order; /* LSBFirst, MSBFirst */
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int depth; /* depth of image */
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int bytes_per_line; /* accelarator to next line */
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int bits_per_pixel; /* bits per pixel (ZPixmap) */
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} TmpImage;
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static void xynormalizeimagebits (
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register unsigned char *bp,
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register TmpImage *img)
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{
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register unsigned char c;
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if (img->byte_order != img->bitmap_bit_order) {
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switch (img->bitmap_unit) {
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case 16:
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c = *bp;
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*bp = *(bp + 1);
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*(bp + 1) = c;
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break;
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case 32:
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c = *(bp + 3);
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*(bp + 3) = *bp;
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*bp = c;
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c = *(bp + 2);
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*(bp + 2) = *(bp + 1);
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*(bp + 1) = c;
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break;
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}
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}
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if (img->bitmap_bit_order == MSBFirst)
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XReverse_Bytes (bp, img->bitmap_unit >> 3);
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}
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static void znormalizeimagebits (
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register unsigned char *bp,
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register TmpImage *img)
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{
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register unsigned char c;
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switch (img->bits_per_pixel) {
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case 4:
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*bp = ((*bp >> 4) & 0xF) | ((*bp << 4) & ~0xF);
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break;
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case 16:
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c = *bp;
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*bp = *(bp + 1);
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*(bp + 1) = c;
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break;
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case 24:
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c = *(bp + 2);
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*(bp + 2) = *bp;
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*bp = c;
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break;
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case 32:
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c = *(bp + 3);
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*(bp + 3) = *bp;
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*bp = c;
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c = *(bp + 2);
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*(bp + 2) = *(bp + 1);
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*(bp + 1) = c;
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break;
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}
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}
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/*
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* Macros
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*
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* The ROUNDUP macro rounds up a quantity to the specified boundary,
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* then truncates to bytes.
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*
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* The XYNORMALIZE macro determines whether XY format data requires
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* normalization and calls a routine to do so if needed. The logic in
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* this module is designed for LSBFirst byte and bit order, so
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* normalization is done as required to present the data in this order.
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*
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* The ZNORMALIZE macro performs byte and nibble order normalization if
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* required for Z format data.
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*
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* The XYINDEX macro computes the index to the starting byte (char) boundary
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* for a bitmap_unit containing a pixel with coordinates x and y for image
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* data in XY format.
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*
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* The ZINDEX macro computes the index to the starting byte (char) boundary
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* for a pixel with coordinates x and y for image data in ZPixmap format.
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*
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*/
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#if defined(Lynx) && defined(ROUNDUP)
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#undef ROUNDUP
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#endif
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#define ROUNDUP(nbytes, pad) ((((nbytes) + ((pad)-1)) / (pad)) * ((pad)>>3))
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#define XYNORMALIZE(bp, img) \
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if ((img->byte_order == MSBFirst) || (img->bitmap_bit_order == MSBFirst)) \
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xynormalizeimagebits((unsigned char *)(bp), img)
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#define ZNORMALIZE(bp, img) \
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if (img->byte_order == MSBFirst) \
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znormalizeimagebits((unsigned char *)(bp), img)
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#define XYINDEX(x, y, img) \
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((y) * img->bytes_per_line) + \
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(((x) + img->xoffset) / img->bitmap_unit) * (img->bitmap_unit >> 3)
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#define ZINDEX(x, y, img) ((y) * img->bytes_per_line) + \
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(((x) * img->bits_per_pixel) >> 3)
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/*
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* GetPixel
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*
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* Returns the specified pixel. The X and Y coordinates are relative to
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* the origin (upper left [0,0]) of the image. The pixel value is returned
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* in normalized format, i.e. the LSB of the long is the LSB of the pixel.
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* The algorithm used is:
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*
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* copy the source bitmap_unit or Zpixel into temp
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* normalize temp if needed
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* extract the pixel bits into return value
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*
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*/
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static unsigned long const low_bits_table[] = {
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0x00000000, 0x00000001, 0x00000003, 0x00000007,
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0x0000000f, 0x0000001f, 0x0000003f, 0x0000007f,
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0x000000ff, 0x000001ff, 0x000003ff, 0x000007ff,
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0x00000fff, 0x00001fff, 0x00003fff, 0x00007fff,
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0x0000ffff, 0x0001ffff, 0x0003ffff, 0x0007ffff,
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0x000fffff, 0x001fffff, 0x003fffff, 0x007fffff,
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0x00ffffff, 0x01ffffff, 0x03ffffff, 0x07ffffff,
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0x0fffffff, 0x1fffffff, 0x3fffffff, 0x7fffffff,
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0xffffffff
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};
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static unsigned long XGetPixel (TmpImage *ximage, int x, int y)
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{
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unsigned long pixel, px;
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register char *src;
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register char *dst;
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register int i, j;
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int bits, nbytes;
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long plane;
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if ((ximage->bits_per_pixel | ximage->depth) == 1) {
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src = &ximage->data[XYINDEX(x, y, ximage)];
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dst = (char *)&pixel;
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pixel = 0;
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for (i = ximage->bitmap_unit >> 3; --i >= 0; ) *dst++ = *src++;
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XYNORMALIZE(&pixel, ximage);
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bits = (x + ximage->xoffset) % ximage->bitmap_unit;
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pixel = ((((char *)&pixel)[bits>>3])>>(bits&7)) & 1;
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} else if (ximage->format == XYPixmap) {
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pixel = 0;
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plane = 0;
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nbytes = ximage->bitmap_unit >> 3;
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for (i = ximage->depth; --i >= 0; ) {
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src = &ximage->data[XYINDEX(x, y, ximage)+ plane];
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dst = (char *)&px;
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px = 0;
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for (j = nbytes; --j >= 0; ) *dst++ = *src++;
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XYNORMALIZE(&px, ximage);
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bits = (x + ximage->xoffset) % ximage->bitmap_unit;
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pixel = (pixel << 1) |
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(((((char *)&px)[bits>>3])>>(bits&7)) & 1);
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plane = plane + (ximage->bytes_per_line * ximage->height);
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}
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} else if (ximage->format == ZPixmap) {
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src = &ximage->data[ZINDEX(x, y, ximage)];
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dst = (char *)&px;
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px = 0;
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for (i = (ximage->bits_per_pixel + 7) >> 3; --i >= 0; )
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*dst++ = *src++;
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ZNORMALIZE(&px, ximage);
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pixel = 0;
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for (i=sizeof(unsigned long); --i >= 0; )
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pixel = (pixel << 8) | ((unsigned char *)&px)[i];
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if (ximage->bits_per_pixel == 4) {
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if (x & 1)
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pixel >>= 4;
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else
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pixel &= 0xf;
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}
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} else {
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return 0; /* bad image */
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}
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if (ximage->bits_per_pixel == ximage->depth)
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return pixel;
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else
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return (pixel & low_bits_table[ximage->depth]);
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}
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unsigned long
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PsGetImagePixel(char *pImage, int depth, int w, int h, int leftPad, int format,
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int px, int py)
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{
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TmpImage xi = {0};
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xi.width = w;
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xi.height = h;
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xi.xoffset = 0/*leftPad*/;
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xi.format = format;
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xi.data = pImage;
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xi.byte_order = IMAGE_BYTE_ORDER;
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xi.bitmap_bit_order = BITMAP_BIT_ORDER;
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xi.bitmap_unit = ((depth > 16)?(32):
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((depth > 8)?(16):
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((depth > 1)? (8):
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(1))));
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xi.depth = depth;
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xi.bits_per_pixel = xi.bitmap_unit;
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/*
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* compute per line accelerator.
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*/
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if (format == ZPixmap)
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xi.bytes_per_line =
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ROUNDUP((xi.bits_per_pixel * xi.width), 32);
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else
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xi.bytes_per_line =
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ROUNDUP((xi.width + xi.xoffset), 32);
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return XGetPixel(&xi, px, py);
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}
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