855 lines
25 KiB
C
Executable File
855 lines
25 KiB
C
Executable File
/*
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jbig2dec
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Copyright (C) 2002-2005 Artifex Software, Inc.
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This software is provided AS-IS with no warranty,
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either express or implied.
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This software is distributed under license and may not
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be copied, modified or distributed except as expressly
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authorized under the terms of the license contained in
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the file LICENSE in this distribution.
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For further licensing information refer to http://artifex.com/ or
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contact Artifex Software, Inc., 7 Mt. Lassen Drive - Suite A-134,
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San Rafael, CA 94903, U.S.A., +1(415)492-9861.
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*/
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/**
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* Generic region handlers.
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**/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "os_types.h"
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#include <stddef.h>
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#include <string.h> /* memcpy(), memset() */
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#ifdef OUTPUT_PBM
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#include <stdio.h>
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#endif
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#include "jbig2.h"
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#include "jbig2_priv.h"
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#include "jbig2_image.h"
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#include "jbig2_arith.h"
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#include "jbig2_generic.h"
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#include "jbig2_mmr.h"
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/* return the appropriate context size for the given template */
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int
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jbig2_generic_stats_size(Jbig2Ctx *ctx, int template)
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{
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int stats_size = template == 0 ? 1 << 16 :
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template == 1 ? 1 << 1 << 13 : 1 << 10;
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return stats_size;
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}
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static int
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jbig2_decode_generic_template0(Jbig2Ctx *ctx,
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Jbig2Segment *segment,
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const Jbig2GenericRegionParams *params,
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Jbig2ArithState *as,
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Jbig2Image *image,
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Jbig2ArithCx *GB_stats)
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{
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const int GBW = image->width;
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const int GBH = image->height;
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const int rowstride = image->stride;
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int x, y;
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byte *gbreg_line = (byte *)image->data;
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/* todo: currently we only handle the nominal gbat location */
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#ifdef OUTPUT_PBM
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printf("P4\n%d %d\n", GBW, GBH);
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#endif
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for (y = 0; y < GBH; y++)
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{
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uint32_t CONTEXT;
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uint32_t line_m1;
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uint32_t line_m2;
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int padded_width = (GBW + 7) & -8;
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line_m1 = (y >= 1) ? gbreg_line[-rowstride] : 0;
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line_m2 = (y >= 2) ? gbreg_line[-(rowstride << 1)] << 6 : 0;
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CONTEXT = (line_m1 & 0x7f0) | (line_m2 & 0xf800);
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/* 6.2.5.7 3d */
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for (x = 0; x < padded_width; x += 8)
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{
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byte result = 0;
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int x_minor;
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int minor_width = GBW - x > 8 ? 8 : GBW - x;
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if (y >= 1)
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line_m1 = (line_m1 << 8) |
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(x + 8 < GBW ? gbreg_line[-rowstride + (x >> 3) + 1] : 0);
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if (y >= 2)
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line_m2 = (line_m2 << 8) |
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(x + 8 < GBW ? gbreg_line[-(rowstride << 1) + (x >> 3) + 1] << 6: 0);
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/* This is the speed-critical inner loop. */
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for (x_minor = 0; x_minor < minor_width; x_minor++)
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{
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bool bit;
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bit = jbig2_arith_decode(as, &GB_stats[CONTEXT]);
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result |= bit << (7 - x_minor);
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CONTEXT = ((CONTEXT & 0x7bf7) << 1) | bit |
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((line_m1 >> (7 - x_minor)) & 0x10) |
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((line_m2 >> (7 - x_minor)) & 0x800);
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}
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gbreg_line[x >> 3] = result;
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}
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#ifdef OUTPUT_PBM
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fwrite(gbreg_line, 1, rowstride, stdout);
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#endif
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gbreg_line += rowstride;
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}
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return 0;
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}
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static int
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jbig2_decode_generic_template0_unopt(Jbig2Ctx *ctx,
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Jbig2Segment *segment,
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const Jbig2GenericRegionParams *params,
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Jbig2ArithState *as,
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Jbig2Image *image,
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Jbig2ArithCx *GB_stats)
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{
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const int GBW = image->width;
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const int GBH = image->height;
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uint32_t CONTEXT;
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int x,y;
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bool bit;
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/* this version is generic and easy to understand, but very slow */
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for (y = 0; y < GBH; y++) {
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for (x = 0; x < GBW; x++) {
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CONTEXT = 0;
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CONTEXT |= jbig2_image_get_pixel(image, x - 1, y) << 0;
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CONTEXT |= jbig2_image_get_pixel(image, x - 2, y) << 1;
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CONTEXT |= jbig2_image_get_pixel(image, x - 3, y) << 2;
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CONTEXT |= jbig2_image_get_pixel(image, x - 4, y) << 3;
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CONTEXT |= jbig2_image_get_pixel(image, x + params->gbat[0],
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y + params->gbat[1]) << 4;
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CONTEXT |= jbig2_image_get_pixel(image, x + 2, y - 1) << 5;
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CONTEXT |= jbig2_image_get_pixel(image, x + 1, y - 1) << 6;
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CONTEXT |= jbig2_image_get_pixel(image, x + 0, y - 1) << 7;
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CONTEXT |= jbig2_image_get_pixel(image, x - 1, y - 1) << 8;
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CONTEXT |= jbig2_image_get_pixel(image, x - 2, y - 1) << 9;
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CONTEXT |= jbig2_image_get_pixel(image, x + params->gbat[2],
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y + params->gbat[3]) << 10;
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CONTEXT |= jbig2_image_get_pixel(image, x + params->gbat[4],
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y + params->gbat[5]) << 11;
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CONTEXT |= jbig2_image_get_pixel(image, x + 1, y - 2) << 12;
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CONTEXT |= jbig2_image_get_pixel(image, x + 0, y - 2) << 13;
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CONTEXT |= jbig2_image_get_pixel(image, x - 1, y - 2) << 14;
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CONTEXT |= jbig2_image_get_pixel(image, x + params->gbat[6],
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y + params->gbat[7]) << 15;
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bit = jbig2_arith_decode(as, &GB_stats[CONTEXT]);
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jbig2_image_set_pixel(image, x, y, bit);
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}
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}
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return 0;
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}
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static int
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jbig2_decode_generic_template1(Jbig2Ctx *ctx,
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Jbig2Segment *segment,
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const Jbig2GenericRegionParams *params,
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Jbig2ArithState *as,
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Jbig2Image *image,
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Jbig2ArithCx *GB_stats)
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{
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const int GBW = image->width;
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const int GBH = image->height;
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const int rowstride = image->stride;
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int x, y;
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byte *gbreg_line = (byte *)image->data;
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/* todo: currently we only handle the nominal gbat location */
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#ifdef OUTPUT_PBM
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printf("P4\n%d %d\n", GBW, GBH);
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#endif
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for (y = 0; y < GBH; y++)
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{
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uint32_t CONTEXT;
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uint32_t line_m1;
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uint32_t line_m2;
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int padded_width = (GBW + 7) & -8;
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line_m1 = (y >= 1) ? gbreg_line[-rowstride] : 0;
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line_m2 = (y >= 2) ? gbreg_line[-(rowstride << 1)] << 5 : 0;
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CONTEXT = ((line_m1 >> 1) & 0x1f8) | ((line_m2 >> 1) & 0x1e00);
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/* 6.2.5.7 3d */
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for (x = 0; x < padded_width; x += 8)
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{
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byte result = 0;
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int x_minor;
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int minor_width = GBW - x > 8 ? 8 : GBW - x;
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if (y >= 1)
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line_m1 = (line_m1 << 8) |
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(x + 8 < GBW ? gbreg_line[-rowstride + (x >> 3) + 1] : 0);
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if (y >= 2)
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line_m2 = (line_m2 << 8) |
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(x + 8 < GBW ? gbreg_line[-(rowstride << 1) + (x >> 3) + 1] << 5: 0);
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/* This is the speed-critical inner loop. */
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for (x_minor = 0; x_minor < minor_width; x_minor++)
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{
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bool bit;
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bit = jbig2_arith_decode(as, &GB_stats[CONTEXT]);
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result |= bit << (7 - x_minor);
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CONTEXT = ((CONTEXT & 0xefb) << 1) | bit |
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((line_m1 >> (8 - x_minor)) & 0x8) |
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((line_m2 >> (8 - x_minor)) & 0x200);
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}
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gbreg_line[x >> 3] = result;
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}
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#ifdef OUTPUT_PBM
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fwrite(gbreg_line, 1, rowstride, stdout);
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#endif
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gbreg_line += rowstride;
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}
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return 0;
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}
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static int
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jbig2_decode_generic_template2(Jbig2Ctx *ctx,
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Jbig2Segment *segment,
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const Jbig2GenericRegionParams *params,
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Jbig2ArithState *as,
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Jbig2Image *image,
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Jbig2ArithCx *GB_stats)
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{
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const int GBW = image->width;
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const int GBH = image->height;
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const int rowstride = image->stride;
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int x, y;
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byte *gbreg_line = (byte *)image->data;
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/* todo: currently we only handle the nominal gbat location */
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#ifdef OUTPUT_PBM
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printf("P4\n%d %d\n", GBW, GBH);
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#endif
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for (y = 0; y < GBH; y++)
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{
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uint32_t CONTEXT;
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uint32_t line_m1;
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uint32_t line_m2;
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int padded_width = (GBW + 7) & -8;
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line_m1 = (y >= 1) ? gbreg_line[-rowstride] : 0;
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line_m2 = (y >= 2) ? gbreg_line[-(rowstride << 1)] << 4 : 0;
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CONTEXT = ((line_m1 >> 3) & 0x7c) | ((line_m2 >> 3) & 0x380);
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/* 6.2.5.7 3d */
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for (x = 0; x < padded_width; x += 8)
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{
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byte result = 0;
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int x_minor;
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int minor_width = GBW - x > 8 ? 8 : GBW - x;
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if (y >= 1)
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line_m1 = (line_m1 << 8) |
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(x + 8 < GBW ? gbreg_line[-rowstride + (x >> 3) + 1] : 0);
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if (y >= 2)
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line_m2 = (line_m2 << 8) |
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(x + 8 < GBW ? gbreg_line[-(rowstride << 1) + (x >> 3) + 1] << 4: 0);
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/* This is the speed-critical inner loop. */
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for (x_minor = 0; x_minor < minor_width; x_minor++)
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{
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bool bit;
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bit = jbig2_arith_decode(as, &GB_stats[CONTEXT]);
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result |= bit << (7 - x_minor);
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CONTEXT = ((CONTEXT & 0x1bd) << 1) | bit |
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((line_m1 >> (10 - x_minor)) & 0x4) |
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((line_m2 >> (10 - x_minor)) & 0x80);
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}
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gbreg_line[x >> 3] = result;
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}
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#ifdef OUTPUT_PBM
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fwrite(gbreg_line, 1, rowstride, stdout);
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#endif
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gbreg_line += rowstride;
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}
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return 0;
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}
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static int
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jbig2_decode_generic_template2a(Jbig2Ctx *ctx,
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Jbig2Segment *segment,
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const Jbig2GenericRegionParams *params,
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Jbig2ArithState *as,
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Jbig2Image *image,
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Jbig2ArithCx *GB_stats)
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{
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const int GBW = image->width;
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const int GBH = image->height;
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const int rowstride = image->stride;
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int x, y;
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byte *gbreg_line = (byte *)image->data;
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/* This is a special case for GBATX1 = 3, GBATY1 = -1 */
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#ifdef OUTPUT_PBM
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printf("P4\n%d %d\n", GBW, GBH);
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#endif
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for (y = 0; y < GBH; y++)
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{
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uint32_t CONTEXT;
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uint32_t line_m1;
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uint32_t line_m2;
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int padded_width = (GBW + 7) & -8;
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line_m1 = (y >= 1) ? gbreg_line[-rowstride] : 0;
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line_m2 = (y >= 2) ? gbreg_line[-(rowstride << 1)] << 4 : 0;
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CONTEXT = ((line_m1 >> 3) & 0x78) | ((line_m1 >> 2) & 0x4) | ((line_m2 >> 3) & 0x380);
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/* 6.2.5.7 3d */
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for (x = 0; x < padded_width; x += 8)
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{
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byte result = 0;
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int x_minor;
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int minor_width = GBW - x > 8 ? 8 : GBW - x;
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if (y >= 1)
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line_m1 = (line_m1 << 8) |
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(x + 8 < GBW ? gbreg_line[-rowstride + (x >> 3) + 1] : 0);
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if (y >= 2)
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line_m2 = (line_m2 << 8) |
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(x + 8 < GBW ? gbreg_line[-(rowstride << 1) + (x >> 3) + 1] << 4: 0);
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/* This is the speed-critical inner loop. */
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for (x_minor = 0; x_minor < minor_width; x_minor++)
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{
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bool bit;
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bit = jbig2_arith_decode(as, &GB_stats[CONTEXT]);
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result |= bit << (7 - x_minor);
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CONTEXT = ((CONTEXT & 0x1b9) << 1) | bit |
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((line_m1 >> (10 - x_minor)) & 0x8) |
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((line_m1 >> (9 - x_minor)) & 0x4) |
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((line_m2 >> (10 - x_minor)) & 0x80);
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}
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gbreg_line[x >> 3] = result;
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}
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#ifdef OUTPUT_PBM
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fwrite(gbreg_line, 1, rowstride, stdout);
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#endif
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gbreg_line += rowstride;
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}
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return 0;
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}
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static int
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jbig2_decode_generic_template3(Jbig2Ctx *ctx,
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Jbig2Segment *segment,
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const Jbig2GenericRegionParams *params,
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Jbig2ArithState *as,
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Jbig2Image *image,
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Jbig2ArithCx *GB_stats)
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{
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const int GBW = image->width;
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const int GBH = image->height;
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const int rowstride = image->stride;
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byte *gbreg_line = (byte *)image->data;
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int x, y;
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/* this routine only handles the nominal AT location */
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#ifdef OUTPUT_PBM
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printf("P4\n%d %d\n", GBW, GBH);
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#endif
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for (y = 0; y < GBH; y++)
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{
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uint32_t CONTEXT;
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uint32_t line_m1;
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int padded_width = (GBW + 7) & -8;
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line_m1 = (y >= 1) ? gbreg_line[-rowstride] : 0;
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CONTEXT = (line_m1 >> 1) & 0x3f0;
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/* 6.2.5.7 3d */
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for (x = 0; x < padded_width; x += 8)
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{
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byte result = 0;
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int x_minor;
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int minor_width = GBW - x > 8 ? 8 : GBW - x;
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if (y >= 1)
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line_m1 = (line_m1 << 8) |
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(x + 8 < GBW ? gbreg_line[-rowstride + (x >> 3) + 1] : 0);
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/* This is the speed-critical inner loop. */
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for (x_minor = 0; x_minor < minor_width; x_minor++)
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{
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bool bit;
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bit = jbig2_arith_decode(as, &GB_stats[CONTEXT]);
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result |= bit << (7 - x_minor);
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CONTEXT = ((CONTEXT & 0x1f7) << 1) | bit |
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((line_m1 >> (10 - x_minor)) & 0x010);
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}
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gbreg_line[x >> 3] = result;
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}
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#ifdef OUTPUT_PBM
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fwrite(gbreg_line, 1, rowstride, stdout);
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#endif
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gbreg_line += rowstride;
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}
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return 0;
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}
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static int
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jbig2_decode_generic_template3_unopt(Jbig2Ctx *ctx,
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Jbig2Segment *segment,
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const Jbig2GenericRegionParams *params,
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Jbig2ArithState *as,
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Jbig2Image *image,
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Jbig2ArithCx *GB_stats)
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{
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const int GBW = image->width;
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const int GBH = image->height;
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uint32_t CONTEXT;
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int x,y;
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bool bit;
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/* this version is generic and easy to understand, but very slow */
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for (y = 0; y < GBH; y++) {
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for (x = 0; x < GBW; x++) {
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CONTEXT = 0;
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CONTEXT |= jbig2_image_get_pixel(image, x - 1, y) << 0;
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CONTEXT |= jbig2_image_get_pixel(image, x - 2, y) << 1;
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CONTEXT |= jbig2_image_get_pixel(image, x - 3, y) << 2;
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CONTEXT |= jbig2_image_get_pixel(image, x - 4, y) << 3;
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CONTEXT |= jbig2_image_get_pixel(image, x + params->gbat[0],
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y + params->gbat[1]) << 4;
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CONTEXT |= jbig2_image_get_pixel(image, x + 1, y - 1) << 5;
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CONTEXT |= jbig2_image_get_pixel(image, x + 0, y - 1) << 6;
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CONTEXT |= jbig2_image_get_pixel(image, x - 1, y - 1) << 7;
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CONTEXT |= jbig2_image_get_pixel(image, x - 2, y - 1) << 8;
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CONTEXT |= jbig2_image_get_pixel(image, x - 3, y - 1) << 9;
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bit = jbig2_arith_decode(as, &GB_stats[CONTEXT]);
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jbig2_image_set_pixel(image, x, y, bit);
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}
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}
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return 0;
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}
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static void
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copy_prev_row(Jbig2Image *image, int row)
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{
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if (!row) {
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/* no previous row */
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memset( image->data, 0, image->stride );
|
|
} else {
|
|
/* duplicate data from the previous row */
|
|
uint8_t *src = image->data + (row - 1) * image->stride;
|
|
memcpy( src + image->stride, src, image->stride );
|
|
}
|
|
}
|
|
|
|
static int
|
|
jbig2_decode_generic_template0_TPGDON(Jbig2Ctx *ctx,
|
|
Jbig2Segment *segment,
|
|
const Jbig2GenericRegionParams *params,
|
|
Jbig2ArithState *as,
|
|
Jbig2Image *image,
|
|
Jbig2ArithCx *GB_stats)
|
|
{
|
|
const int GBW = image->width;
|
|
const int GBH = image->height;
|
|
uint32_t CONTEXT;
|
|
int x, y;
|
|
bool bit;
|
|
int LTP = 0;
|
|
|
|
for (y = 0; y < GBH; y++)
|
|
{
|
|
LTP ^= jbig2_arith_decode(as, &GB_stats[0x9B25]);
|
|
if (!LTP) {
|
|
for (x = 0; x < GBW; x++) {
|
|
CONTEXT = jbig2_image_get_pixel(image, x - 1, y);
|
|
CONTEXT |= jbig2_image_get_pixel(image, x - 2, y) << 1;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x - 3, y) << 2;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x - 4, y) << 3;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x + params->gbat[0],
|
|
y + params->gbat[1]) << 4;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x + 2, y - 1) << 5;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x + 1, y - 1) << 6;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x , y - 1) << 7;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x - 1, y - 1) << 8;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x - 2, y - 1) << 9;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x + params->gbat[2],
|
|
y + params->gbat[3]) << 10;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x + params->gbat[4],
|
|
y + params->gbat[5]) << 11;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x + 1, y - 2) << 12;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x , y - 2) << 13;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x - 1, y - 2) << 14;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x + params->gbat[6],
|
|
y + params->gbat[7]) << 15;
|
|
bit = jbig2_arith_decode(as, &GB_stats[CONTEXT]);
|
|
jbig2_image_set_pixel(image, x, y, bit);
|
|
}
|
|
} else {
|
|
copy_prev_row(image, y);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
jbig2_decode_generic_template1_TPGDON(Jbig2Ctx *ctx,
|
|
Jbig2Segment *segment,
|
|
const Jbig2GenericRegionParams *params,
|
|
Jbig2ArithState *as,
|
|
Jbig2Image *image,
|
|
Jbig2ArithCx *GB_stats)
|
|
{
|
|
const int GBW = image->width;
|
|
const int GBH = image->height;
|
|
uint32_t CONTEXT;
|
|
int x, y;
|
|
bool bit;
|
|
int LTP = 0;
|
|
|
|
for (y = 0; y < GBH; y++) {
|
|
LTP ^= jbig2_arith_decode(as, &GB_stats[0x0795]);
|
|
if (!LTP) {
|
|
for (x = 0; x < GBW; x++) {
|
|
CONTEXT = jbig2_image_get_pixel(image, x - 1, y);
|
|
CONTEXT |= jbig2_image_get_pixel(image, x - 2, y) << 1;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x - 3, y) << 2;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x + params->gbat[0],
|
|
y + params->gbat[1]) << 3;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x + 2, y - 1) << 4;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x + 1, y - 1) << 5;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x , y - 1) << 6;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x - 1, y - 1) << 7;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x - 2, y - 1) << 8;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x + 2, y - 2) << 9;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x + 1, y - 2) << 10;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x , y - 2) << 11;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x - 1, y - 2) << 12;
|
|
bit = jbig2_arith_decode(as, &GB_stats[CONTEXT]);
|
|
jbig2_image_set_pixel(image, x, y, bit);
|
|
}
|
|
} else {
|
|
copy_prev_row(image, y);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
jbig2_decode_generic_template2_TPGDON(Jbig2Ctx *ctx,
|
|
Jbig2Segment *segment,
|
|
const Jbig2GenericRegionParams *params,
|
|
Jbig2ArithState *as,
|
|
Jbig2Image *image,
|
|
Jbig2ArithCx *GB_stats)
|
|
{
|
|
const int GBW = image->width;
|
|
const int GBH = image->height;
|
|
uint32_t CONTEXT;
|
|
int x, y;
|
|
bool bit;
|
|
int LTP = 0;
|
|
|
|
for (y = 0; y < GBH; y++) {
|
|
LTP ^= jbig2_arith_decode(as, &GB_stats[0xE5]);
|
|
if (!LTP) {
|
|
for (x = 0; x < GBW; x++) {
|
|
CONTEXT = jbig2_image_get_pixel(image, x - 1, y);
|
|
CONTEXT |= jbig2_image_get_pixel(image, x - 2, y) << 1;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x + params->gbat[0],
|
|
y + params->gbat[1]) << 2;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x + 1, y - 1) << 3;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x , y - 1) << 4;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x - 1, y - 1) << 5;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x - 2, y - 1) << 6;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x + 1, y - 2) << 7;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x , y - 2) << 8;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x - 1, y - 2) << 9;
|
|
bit = jbig2_arith_decode(as, &GB_stats[CONTEXT]);
|
|
jbig2_image_set_pixel(image, x, y, bit);
|
|
}
|
|
} else {
|
|
copy_prev_row(image, y);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
jbig2_decode_generic_template3_TPGDON(Jbig2Ctx *ctx,
|
|
Jbig2Segment *segment,
|
|
const Jbig2GenericRegionParams *params,
|
|
Jbig2ArithState *as,
|
|
Jbig2Image *image,
|
|
Jbig2ArithCx *GB_stats)
|
|
{
|
|
const int GBW = image->width;
|
|
const int GBH = image->height;
|
|
uint32_t CONTEXT;
|
|
int x, y;
|
|
bool bit;
|
|
int LTP = 0;
|
|
|
|
for (y = 0; y < GBH; y++) {
|
|
LTP ^= jbig2_arith_decode(as, &GB_stats[0x0195]);
|
|
if (!LTP) {
|
|
for (x = 0; x < GBW; x++) {
|
|
CONTEXT = jbig2_image_get_pixel(image, x - 1, y);
|
|
CONTEXT |= jbig2_image_get_pixel(image, x - 2, y) << 1;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x - 3, y) << 2;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x - 4, y) << 3;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x + params->gbat[0],
|
|
y + params->gbat[1]) << 4;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x + 1, y - 1) << 5;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x , y - 1) << 6;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x - 1, y - 1) << 7;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x - 2, y - 1) << 8;
|
|
CONTEXT |= jbig2_image_get_pixel(image, x - 3, y - 1) << 9;
|
|
bit = jbig2_arith_decode(as, &GB_stats[CONTEXT]);
|
|
jbig2_image_set_pixel(image, x, y, bit);
|
|
}
|
|
} else {
|
|
copy_prev_row(image, y);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
jbig2_decode_generic_region_TPGDON(Jbig2Ctx *ctx,
|
|
Jbig2Segment *segment,
|
|
const Jbig2GenericRegionParams *params,
|
|
Jbig2ArithState *as,
|
|
Jbig2Image *image,
|
|
Jbig2ArithCx *GB_stats)
|
|
{
|
|
switch (params->GBTEMPLATE) {
|
|
case 0:
|
|
return jbig2_decode_generic_template0_TPGDON(ctx, segment,
|
|
params, as, image, GB_stats);
|
|
case 1:
|
|
return jbig2_decode_generic_template1_TPGDON(ctx, segment,
|
|
params, as, image, GB_stats);
|
|
case 2:
|
|
return jbig2_decode_generic_template2_TPGDON(ctx, segment,
|
|
params, as, image, GB_stats);
|
|
case 3:
|
|
return jbig2_decode_generic_template3_TPGDON(ctx, segment,
|
|
params, as, image, GB_stats);
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* jbig2_decode_generic_region: Decode a generic region.
|
|
* @ctx: The context for allocation and error reporting.
|
|
* @segment: A segment reference for error reporting.
|
|
* @params: Decoding parameter set.
|
|
* @as: Arithmetic decoder state.
|
|
* @image: Where to store the decoded data.
|
|
* @GB_stats: Arithmetic stats.
|
|
*
|
|
* Decodes a generic region, according to section 6.2. The caller should
|
|
* pass an already allocated Jbig2Image object for @image
|
|
*
|
|
* Because this API is based on an arithmetic decoding state, it is
|
|
* not suitable for MMR decoding.
|
|
*
|
|
* Return code: 0 on success.
|
|
**/
|
|
int
|
|
jbig2_decode_generic_region(Jbig2Ctx *ctx,
|
|
Jbig2Segment *segment,
|
|
const Jbig2GenericRegionParams *params,
|
|
Jbig2ArithState *as,
|
|
Jbig2Image *image,
|
|
Jbig2ArithCx *GB_stats)
|
|
{
|
|
const int8_t *gbat = params->gbat;
|
|
|
|
if (!params->MMR && params->TPGDON)
|
|
return jbig2_decode_generic_region_TPGDON(ctx, segment, params,
|
|
as, image, GB_stats);
|
|
|
|
if (!params->MMR && params->GBTEMPLATE == 0) {
|
|
if (gbat[0] == +3 && gbat[1] == -1 &&
|
|
gbat[2] == -3 && gbat[3] == -1 &&
|
|
gbat[4] == +2 && gbat[5] == -2 &&
|
|
gbat[6] == -2 && gbat[7] == -2)
|
|
return jbig2_decode_generic_template0(ctx, segment, params,
|
|
as, image, GB_stats);
|
|
else
|
|
return jbig2_decode_generic_template0_unopt(ctx, segment, params,
|
|
as, image, GB_stats);
|
|
} else if (!params->MMR && params->GBTEMPLATE == 1)
|
|
return jbig2_decode_generic_template1(ctx, segment, params,
|
|
as, image, GB_stats);
|
|
else if (!params->MMR && params->GBTEMPLATE == 2)
|
|
{
|
|
if (gbat[0] == 3 && gbat[1] == -1)
|
|
return jbig2_decode_generic_template2a(ctx, segment, params,
|
|
as, image, GB_stats);
|
|
else
|
|
return jbig2_decode_generic_template2(ctx, segment, params,
|
|
as, image, GB_stats);
|
|
}
|
|
else if (!params->MMR && params->GBTEMPLATE == 3) {
|
|
if (gbat[0] == 2 && gbat[1] == -1)
|
|
return jbig2_decode_generic_template3_unopt(ctx, segment, params,
|
|
as, image, GB_stats);
|
|
else
|
|
return jbig2_decode_generic_template3_unopt(ctx, segment, params,
|
|
as, image, GB_stats);
|
|
}
|
|
|
|
{
|
|
int i;
|
|
for (i = 0; i < 8; i++)
|
|
jbig2_error(ctx, JBIG2_SEVERITY_DEBUG, segment->number,
|
|
"gbat[%d] = %d", i, params->gbat[i]);
|
|
}
|
|
jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number,
|
|
"decode_generic_region: MMR=%d, GBTEMPLATE=%d NYI",
|
|
params->MMR, params->GBTEMPLATE);
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* Handler for immediate generic region segments
|
|
*/
|
|
int
|
|
jbig2_immediate_generic_region(Jbig2Ctx *ctx, Jbig2Segment *segment,
|
|
const byte *segment_data)
|
|
{
|
|
Jbig2RegionSegmentInfo rsi;
|
|
byte seg_flags;
|
|
int8_t gbat[8];
|
|
int offset;
|
|
int gbat_bytes = 0;
|
|
Jbig2GenericRegionParams params;
|
|
int code;
|
|
Jbig2Image *image;
|
|
Jbig2WordStream *ws;
|
|
Jbig2ArithState *as;
|
|
Jbig2ArithCx *GB_stats = NULL;
|
|
|
|
/* 7.4.6 */
|
|
if (segment->data_length < 18)
|
|
return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,
|
|
"Segment too short");
|
|
|
|
jbig2_get_region_segment_info(&rsi, segment_data);
|
|
jbig2_error(ctx, JBIG2_SEVERITY_INFO, segment->number,
|
|
"generic region: %d x %d @ (%d, %d), flags = %02x",
|
|
rsi.width, rsi.height, rsi.x, rsi.y, rsi.flags);
|
|
|
|
/* 7.4.6.2 */
|
|
seg_flags = segment_data[17];
|
|
jbig2_error(ctx, JBIG2_SEVERITY_INFO, segment->number,
|
|
"segment flags = %02x", seg_flags);
|
|
if ((seg_flags & 1) && (seg_flags & 6))
|
|
jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number,
|
|
"MMR is 1, but GBTEMPLATE is not 0");
|
|
|
|
/* 7.4.6.3 */
|
|
if (!(seg_flags & 1))
|
|
{
|
|
gbat_bytes = (seg_flags & 6) ? 2 : 8;
|
|
if (18 + gbat_bytes > segment->data_length)
|
|
return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,
|
|
"Segment too short");
|
|
memcpy(gbat, segment_data + 18, gbat_bytes);
|
|
jbig2_error(ctx, JBIG2_SEVERITY_INFO, segment->number,
|
|
"gbat: %d, %d", gbat[0], gbat[1]);
|
|
}
|
|
|
|
offset = 18 + gbat_bytes;
|
|
|
|
/* Table 34 */
|
|
params.MMR = seg_flags & 1;
|
|
params.GBTEMPLATE = (seg_flags & 6) >> 1;
|
|
params.TPGDON = (seg_flags & 8) >> 3;
|
|
params.USESKIP = 0;
|
|
memcpy (params.gbat, gbat, gbat_bytes);
|
|
|
|
image = jbig2_image_new(ctx, rsi.width, rsi.height);
|
|
if (image == NULL)
|
|
return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,
|
|
"unable to allocate generic image");
|
|
jbig2_error(ctx, JBIG2_SEVERITY_DEBUG, segment->number,
|
|
"allocated %d x %d image buffer for region decode results",
|
|
rsi.width, rsi.height);
|
|
|
|
if (params.MMR)
|
|
{
|
|
code = jbig2_decode_generic_mmr(ctx, segment, ¶ms,
|
|
segment_data + offset, segment->data_length - offset,
|
|
image);
|
|
}
|
|
else
|
|
{
|
|
int stats_size = jbig2_generic_stats_size(ctx, params.GBTEMPLATE);
|
|
GB_stats = jbig2_alloc(ctx->allocator, stats_size);
|
|
memset(GB_stats, 0, stats_size);
|
|
|
|
ws = jbig2_word_stream_buf_new(ctx,
|
|
segment_data + offset,
|
|
segment->data_length - offset);
|
|
as = jbig2_arith_new(ctx, ws);
|
|
code = jbig2_decode_generic_region(ctx, segment, ¶ms,
|
|
as, image, GB_stats);
|
|
jbig2_free(ctx->allocator, as);
|
|
jbig2_word_stream_buf_free(ctx, ws);
|
|
|
|
jbig2_free(ctx->allocator, GB_stats);
|
|
}
|
|
|
|
jbig2_page_add_result(ctx, &ctx->pages[ctx->current_page],
|
|
image, rsi.x, rsi.y, JBIG2_COMPOSE_OR);
|
|
jbig2_image_release(ctx, image);
|
|
|
|
return code;
|
|
}
|