Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/include/mupdf/fitz/bitmap.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_BITMAP_H
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24 #define MUPDF_FITZ_BITMAP_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/pixmap.h"
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29
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30 /**
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31 Bitmaps have 1 bit per component. Only used for creating
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32 halftoned versions of contone buffers, and saving out. Samples
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33 are stored msb first, akin to pbms.
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34
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35 The internals of this struct are considered implementation
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36 details and subject to change. Where possible, accessor
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37 functions should be used in preference.
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38 */
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39 typedef struct
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40 {
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41 int refs;
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42 int w, h, stride, n;
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43 int xres, yres;
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44 unsigned char *samples;
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45 } fz_bitmap;
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47 /**
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48 Take an additional reference to the bitmap. The same pointer
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49 is returned.
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50
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51 Never throws exceptions.
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52 */
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53 fz_bitmap *fz_keep_bitmap(fz_context *ctx, fz_bitmap *bit);
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54
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55 /**
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56 Drop a reference to the bitmap. When the reference count reaches
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57 zero, the bitmap will be destroyed.
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58
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59 Never throws exceptions.
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60 */
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61 void fz_drop_bitmap(fz_context *ctx, fz_bitmap *bit);
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62
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63 /**
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64 Invert bitmap.
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65
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66 Never throws exceptions.
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67 */
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68 void fz_invert_bitmap(fz_context *ctx, fz_bitmap *bmp);
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70 /**
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71 A halftone is a set of threshold tiles, one per component. Each
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72 threshold tile is a pixmap, possibly of varying sizes and
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73 phases. Currently, we only provide one 'default' halftone tile
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74 for operating on 1 component plus alpha pixmaps (where the alpha
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75 is ignored). This is signified by a fz_halftone pointer to NULL.
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76 */
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77 typedef struct fz_halftone fz_halftone;
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79 /**
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80 Make a bitmap from a pixmap and a halftone.
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81
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82 pix: The pixmap to generate from. Currently must be a single
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83 color component with no alpha.
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85 ht: The halftone to use. NULL implies the default halftone.
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87 Returns the resultant bitmap. Throws exceptions in the case of
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88 failure to allocate.
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89 */
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90 fz_bitmap *fz_new_bitmap_from_pixmap(fz_context *ctx, fz_pixmap *pix, fz_halftone *ht);
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91
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92 /**
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93 Make a bitmap from a pixmap and a halftone.
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95 img: The image to generate from. Currently must be a single
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96 color component with no alpha.
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98 ht: The halftone to use. NULL implies the default halftone.
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100 Returns the resultant bitmap. Throws exceptions in the case of
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101 failure to allocate.
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102 */
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103 fz_bitmap *fz_new_bitmap_from_image(fz_context *ctx, fz_image *img, fz_halftone *ht);
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104
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105 /**
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diff changeset
106 Make a bitmap from a pixmap and a
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107 halftone, allowing for the position of the pixmap within an
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108 overall banded rendering.
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109
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110 pix: The pixmap to generate from. Currently must be a single
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111 color component with no alpha.
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112
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113 ht: The halftone to use. NULL implies the default halftone.
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114
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115 band_start: Vertical offset within the overall banded rendering
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116 (in pixels)
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117
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118 Returns the resultant bitmap. Throws exceptions in the case of
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119 failure to allocate.
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120 */
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Franz Glasner <fzglas.hg@dom66.de>
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121 fz_bitmap *fz_new_bitmap_from_pixmap_band(fz_context *ctx, fz_pixmap *pix, fz_halftone *ht, int band_start);
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122
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123 /**
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124 Create a new bitmap.
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125
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126 w, h: Width and Height for the bitmap
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127
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128 n: Number of color components (assumed to be a divisor of 8)
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129
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130 xres, yres: X and Y resolutions (in pixels per inch).
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131
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132 Returns pointer to created bitmap structure. The bitmap
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133 data is uninitialised.
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134 */
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135 fz_bitmap *fz_new_bitmap(fz_context *ctx, int w, int h, int n, int xres, int yres);
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136
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137 /**
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138 Retrieve details of a given bitmap.
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139
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140 bitmap: The bitmap to query.
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141
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142 w: Pointer to storage to retrieve width (or NULL).
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143
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144 h: Pointer to storage to retrieve height (or NULL).
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145
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146 n: Pointer to storage to retrieve number of color components (or
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147 NULL).
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148
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149 stride: Pointer to storage to retrieve bitmap stride (or NULL).
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150 */
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151 void fz_bitmap_details(fz_bitmap *bitmap, int *w, int *h, int *n, int *stride);
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152
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153 /**
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154 Set the entire bitmap to 0.
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155
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156 Never throws exceptions.
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157 */
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158 void fz_clear_bitmap(fz_context *ctx, fz_bitmap *bit);
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159
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160 /**
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diff changeset
161 Create a 'default' halftone structure
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162 for the given number of components.
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163
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diff changeset
164 num_comps: The number of components to use.
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165
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diff changeset
166 Returns a simple default halftone. The default halftone uses
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parents:
diff changeset
167 the same halftone tile for each plane, which may not be ideal
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parents:
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168 for all purposes.
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169 */
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170 fz_halftone *fz_default_halftone(fz_context *ctx, int num_comps);
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171
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172 /**
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diff changeset
173 Take an additional reference to the halftone. The same pointer
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diff changeset
174 is returned.
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175
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176 Never throws exceptions.
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177 */
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parents:
diff changeset
178 fz_halftone *fz_keep_halftone(fz_context *ctx, fz_halftone *half);
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179
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180 /**
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parents:
diff changeset
181 Drop a reference to the halftone. When the reference count
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parents:
diff changeset
182 reaches zero, the halftone is destroyed.
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183
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diff changeset
184 Never throws exceptions.
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185 */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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186 void fz_drop_halftone(fz_context *ctx, fz_halftone *ht);
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187
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188 #endif