Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/include/mupdf/fitz/story.h @ 40:aa33339d6b8a upstream

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ADD: MuPDF v1.26.10: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.5.
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 11:31:38 +0200
parents b50eed0cc0ef
children
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1 // Copyright (C) 2004-2025 Artifex Software, Inc.
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2 //
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3 // This file is part of MuPDF.
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4 //
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5 // MuPDF is free software: you can redistribute it and/or modify it under the
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6 // terms of the GNU Affero General Public License as published by the Free
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7 // Software Foundation, either version 3 of the License, or (at your option)
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8 // any later version.
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9 //
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10 // MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
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11 // WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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12 // FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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13 // details.
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14 //
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15 // You should have received a copy of the GNU Affero General Public License
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16 // along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
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17 //
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18 // Alternative licensing terms are available from the licensor.
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19 // For commercial licensing, see <https://www.artifex.com/> or contact
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20 // Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
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21 // CA 94129, USA, for further information.
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23 #ifndef MUPDF_FITZ_STORY_H
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24 #define MUPDF_FITZ_STORY_H
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26 #include "mupdf/fitz/system.h"
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27 #include "mupdf/fitz/context.h"
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28 #include "mupdf/fitz/buffer.h"
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29 #include "mupdf/fitz/device.h"
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30 #include "mupdf/fitz/xml.h"
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31 #include "mupdf/fitz/archive.h"
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33 /*
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34 This header file provides an API for laying out and placing styled
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35 text on a page, or pages.
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37 First a text story is created from some styled HTML.
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38
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39 Next, this story can be laid out into a given rectangle (possibly
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40 retrying several times with updated rectangles as required).
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42 Next, the laid out story can be drawn to a given device.
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44 In the case where the text story cannot be fitted into the given
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45 areas all at once, these two steps can be repeated multiple
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46 times until the text story is completely consumed.
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48 Finally, the text story can be dropped in the usual fashion.
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49 */
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52 typedef struct fz_story fz_story;
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54 /*
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55 Create a text story using styled html.
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56
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57 Passing a NULL buffer will be treated as an empty document.
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58 Passing a NULL user_css will be treated as an empty CSS string.
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59 A non-NULL dir will allow images etc to be loaded. The
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60 story keeps its own reference, so the caller can drop its
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61 reference after this call.
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62 */
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63 fz_story *fz_new_story(fz_context *ctx, fz_buffer *buf, const char *user_css, float em, fz_archive *dir);
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65 /*
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66 Retrieve the warnings given from parsing this story.
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68 If there are warnings, this will be returned as a NULL terminated
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69 C string. If there are no warnings, this will return NULL.
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71 These warnings will not be complete until AFTER any DOM manipulations
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72 have been completed.
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74 This function does not need to be called, but once it has been
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75 the DOM is no longer accessible, and any fz_xml pointer
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76 retrieved from fz_story_document is no longer valid.
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77 */
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78 const char *fz_story_warnings(fz_context *ctx, fz_story *story);
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80 /*
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81 Equivalent to fz_place_story_flags with flags being 0.
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82 */
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83 int fz_place_story(fz_context *ctx, fz_story *story, fz_rect where, fz_rect *filled);
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84
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85 /*
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86 Place (or continue placing) a story into the supplied rectangle
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87 'where', updating 'filled' with the actual area that was used.
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88 Returns zero (FZ_PLACE_STORY_RETURN_ALL_FITTED) if all the
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89 content fitted, non-zero if there is more to fit.
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90
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91 If the FZ_PLACE_STORY_FLAG_NO_OVERFLOW flag is set, then a
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92 return code of FZ_PLACE_STORY_RETURN_OVERFLOW_WIDTH will be
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93 returned when the next item (word) to be placed would not fit
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94 in a rectangle of that given width.
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96 Note, that filled may not be returned as a strict subset of
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97 where, due to padding/margins at the bottom of pages, and
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98 non-wrapping content extending to the right.
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99
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100 Subsequent calls will attempt to place the same section of story
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101 again and again, until the placed story is drawn using fz_draw_story,
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102 whereupon subsequent calls to fz_place_story will attempt to place
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103 the unused remainder of the story.
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104
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105 After this function is called, the DOM is no longer accessible,
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106 and any fz_xml pointer retrieved from fz_story_document is no
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107 longer valid.
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108
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109 flags: Additional flags controlling layout. Pass 0 if none
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110 required.
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111 */
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112 int fz_place_story_flags(fz_context *ctx, fz_story *story, fz_rect where, fz_rect *filled, int flags);
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113
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114 enum
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115 {
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116 /* Avoid the usual HTML behaviour of overflowing the box horizontally
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117 * in some circumstances. We now abort the place in such cases and
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118 * return with */
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119 FZ_PLACE_STORY_FLAG_NO_OVERFLOW = 1,
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120
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121 /* Specific return codes from fz_place_story_flags. Also
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122 * "non-zero" for 'more to fit'. */
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123 FZ_PLACE_STORY_RETURN_ALL_FITTED = 0,
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124 FZ_PLACE_STORY_RETURN_OVERFLOW_WIDTH = 2
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125 };
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126
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127 /*
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128 Draw the placed story to the given device.
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129
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130 This moves the point at which subsequent calls to fz_place_story
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131 will restart placing to the end of what has just been output.
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132 */
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133 void fz_draw_story(fz_context *ctx, fz_story *story, fz_device *dev, fz_matrix ctm);
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134
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135 /*
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136 Reset the position within the story at which the next layout call
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137 will continue to the start of the story.
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138 */
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139 void fz_reset_story(fz_context *ctx, fz_story *story);
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140
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141 /*
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142 Drop the html story.
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143 */
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144 void fz_drop_story(fz_context *ctx, fz_story *story);
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145
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146 /*
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147 Get a borrowed reference to the DOM document pointer for this
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148 story. Do not destroy this reference, it will be destroyed
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149 when the story is laid out.
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150
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151 This only makes sense before the first placement of the story
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152 or retrieval of the warnings. Once either of those things happen
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153 the DOM representation is destroyed.
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154 */
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155 fz_xml *fz_story_document(fz_context *ctx, fz_story *story);
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156
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157
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158 typedef struct
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159 {
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160 /* The overall depth of this element in the box structure.
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161 * This can be used to compare the relative depths of different
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162 * elements, but shouldn't be relied upon not to change between
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163 * different versions of MuPDF. */
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164 int depth;
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165
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166 /* The heading level of this element. 0 if not a header, or 1-6 for h1-h6. */
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167 int heading;
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168
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169 /* The id for this element. */
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170 const char *id;
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171
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172 /* The href for this element. */
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173 const char *href;
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174
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175 /* The rectangle for this element. */
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176 fz_rect rect;
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177
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178 /* The immediate text for this element. */
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179 const char *text;
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180
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181 /* This indicates whether this opens and/or closes this element.
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182 *
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183 * As we traverse the tree we do a depth first search. In order for
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184 * the caller of fz_story_positions to know whether a given element
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185 * is inside another element, we therefore announce 'start' and 'stop'
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186 * for each element. For instance, with:
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187 *
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188 * <div id="part1">
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189 * <h1>Chapter 1</h1>...
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190 * <h1>Chapter 2</h1>...
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191 * ...
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192 * </div>
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193 * <div id="part2">
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194 * <h1>Chapter 10</h1>...
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195 * <h1>Chapter 11</h1>...
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196 * ...
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197 * </div>
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198 *
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199 * We would announce:
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200 * + id='part1' (open)
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201 * + header=1 "Chapter 1" (open/close)
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202 * + header=1 "Chapter 2" (open/close)
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203 * ...
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204 * + id='part1' (close)
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205 * + id='part2' (open)
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206 * + header=1 "Chapter 10" (open/close)
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207 * + header=1 "Chapter 11" (open/close)
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208 * ...
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209 * + id='part2' (close)
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210 *
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211 * If bit 0 is set, then this 'opens' the element.
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212 * If bit 1 is set, then this 'closes' the element.
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213 */
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214 int open_close;
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215
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216 /* A count of the number of rectangles that the layout code has split the
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217 * story into so far. After the first layout, this will be 1. If a
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218 * layout is repeated, this number is not incremented. */
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219 int rectangle_num;
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220 } fz_story_element_position;
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221
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222 typedef void (fz_story_position_callback)(fz_context *ctx, void *arg, const fz_story_element_position *);
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223
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224 /*
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225 Enumerate the positions for key blocks in the story.
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226
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227 This will cause the supplied function to be called with details of each
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228 element in the story that is either a header, or has an id.
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229 */
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230 void fz_story_positions(fz_context *ctx, fz_story *story, fz_story_position_callback *cb, void *arg);
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231
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232 #endif