Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/include/mupdf/fitz/shade.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_SHADE_H
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24 #define MUPDF_FITZ_SHADE_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/geometry.h"
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29 #include "mupdf/fitz/store.h"
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30 #include "mupdf/fitz/pixmap.h"
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31 #include "mupdf/fitz/compressed-buffer.h"
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32
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33 /**
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34 * The shading code uses gouraud shaded triangle meshes.
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35 */
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36
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37 enum
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38 {
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39 FZ_FUNCTION_BASED = 1,
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40 FZ_LINEAR = 2,
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41 FZ_RADIAL = 3,
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42 FZ_MESH_TYPE4 = 4,
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43 FZ_MESH_TYPE5 = 5,
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44 FZ_MESH_TYPE6 = 6,
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45 FZ_MESH_TYPE7 = 7
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46 };
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47
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48 /**
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49 Structure is public to allow derived classes. Do not
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50 access the members directly.
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51 */
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52 typedef struct
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53 {
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54 fz_storable storable;
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55
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56 fz_rect bbox; /* can be fz_infinite_rect */
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57 fz_colorspace *colorspace;
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58
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59 fz_matrix matrix; /* matrix from pattern dict */
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60 int use_background; /* background color for fills but not 'sh' */
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61 float background[FZ_MAX_COLORS];
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62
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63 /* Just to be confusing, PDF Shadings of Type 1 (Function Based
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64 * Shadings), do NOT use function, but all the others do. This
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65 * is because Type 1 shadings take 2 inputs, whereas all the
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66 * others (when used with a function take 1 input. The type 1
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67 * data is in the 'f' field of the union below. */
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68 /* If function_stride = 0, then function is not used. Otherwise
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69 * function points to 256*function_stride entries. */
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70 int function_stride;
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71 float *function;
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72
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73 int type; /* function, linear, radial, mesh */
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74 union
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75 {
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76 struct
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77 {
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78 int extend[2];
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79 float coords[2][3]; /* (x,y,r) twice */
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80 } l_or_r;
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81 struct
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82 {
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83 int vprow;
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84 int bpflag;
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85 int bpcoord;
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86 int bpcomp;
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87 float x0, x1;
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88 float y0, y1;
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89 float c0[FZ_MAX_COLORS];
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90 float c1[FZ_MAX_COLORS];
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91 } m;
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92 struct
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93 {
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94 fz_matrix matrix;
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95 int xdivs;
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96 int ydivs;
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97 float domain[2][2];
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98 float *fn_vals;
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99 } f;
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100 } u;
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101
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102 fz_compressed_buffer *buffer;
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103 } fz_shade;
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104
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105 /**
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106 Increment the reference count for the shade structure. The
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107 same pointer is returned.
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108
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109 Never throws exceptions.
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110 */
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111 fz_shade *fz_keep_shade(fz_context *ctx, fz_shade *shade);
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112
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113 /**
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114 Decrement the reference count for the shade structure. When
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115 the reference count hits zero, the structure is freed.
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116
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117 Never throws exceptions.
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118 */
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119 void fz_drop_shade(fz_context *ctx, fz_shade *shade);
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120
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121 /**
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122 Bound a given shading.
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123
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124 shade: The shade to bound.
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125
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126 ctm: The transform to apply to the shade before bounding.
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127
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128 r: Pointer to storage to put the bounds in.
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129
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130 Returns r, updated to contain the bounds for the shading.
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131 */
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132 fz_rect fz_bound_shade(fz_context *ctx, fz_shade *shade, fz_matrix ctm);
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133
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134 typedef struct fz_shade_color_cache fz_shade_color_cache;
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135
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136 void fz_drop_shade_color_cache(fz_context *ctx, fz_shade_color_cache *cache);
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137
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138 /**
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139 Render a shade to a given pixmap.
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140
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141 shade: The shade to paint.
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142
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143 override_cs: NULL, or colorspace to override the shades
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144 inbuilt colorspace.
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145
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146 ctm: The transform to apply.
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147
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148 dest: The pixmap to render into.
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149
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150 color_params: The color rendering settings
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151
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152 bbox: Pointer to a bounding box to limit the rendering
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153 of the shade.
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154
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155 eop: NULL, or pointer to overprint bitmap.
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156
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157 cache: *cache is used to cache color information. If *cache is NULL it
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158 is set to point to a new fz_shade_color_cache. If cache is NULL it is
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159 ignored.
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160 */
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161 void fz_paint_shade(fz_context *ctx, fz_shade *shade, fz_colorspace *override_cs, fz_matrix ctm, fz_pixmap *dest, fz_color_params color_params, fz_irect bbox, const fz_overprint *eop, fz_shade_color_cache **cache);
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162
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163 /**
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164 * Handy routine for processing mesh based shades
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165 */
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166 typedef struct
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167 {
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168 fz_point p;
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169 float c[FZ_MAX_COLORS];
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170 } fz_vertex;
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171
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172 /**
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173 Callback function type for use with
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174 fz_process_shade.
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175
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diff changeset
176 arg: Opaque pointer from fz_process_shade caller.
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177
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178 v: Pointer to a fz_vertex structure to populate.
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179
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180 c: Pointer to an array of floats used to populate v.
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181 */
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diff changeset
182 typedef void (fz_shade_prepare_fn)(fz_context *ctx, void *arg, fz_vertex *v, const float *c);
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183
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184 /**
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diff changeset
185 Callback function type for use with
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186 fz_process_shade.
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187
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diff changeset
188 arg: Opaque pointer from fz_process_shade caller.
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189
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diff changeset
190 av, bv, cv: Pointers to a fz_vertex structure describing
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diff changeset
191 the corner locations and colors of a triangle to be
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192 filled.
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193 */
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diff changeset
194 typedef void (fz_shade_process_fn)(fz_context *ctx, void *arg, fz_vertex *av, fz_vertex *bv, fz_vertex *cv);
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195
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196 /**
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diff changeset
197 Process a shade, using supplied callback functions. This
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198 decomposes the shading to a mesh (even ones that are not
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diff changeset
199 natively meshes, such as linear or radial shadings), and
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parents:
diff changeset
200 processes triangles from those meshes.
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201
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diff changeset
202 shade: The shade to process.
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203
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204 ctm: The transform to use
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205
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206 prepare: Callback function to 'prepare' each vertex.
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207 This function is passed an array of floats, and populates
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208 a fz_vertex structure.
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209
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210 process: This function is passed 3 pointers to vertex
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211 structures, and actually performs the processing (typically
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212 filling the area between the vertices).
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213
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214 process_arg: An opaque argument passed through from caller
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215 to callback functions.
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216 */
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217 void fz_process_shade(fz_context *ctx, fz_shade *shade, fz_matrix ctm, fz_rect scissor,
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218 fz_shade_prepare_fn *prepare,
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219 fz_shade_process_fn *process,
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220 void *process_arg);
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221
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222
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223 /* Implementation details: subject to change. */
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224
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225 /**
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226 Internal function to destroy a
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227 shade. Only exposed for use with the fz_store.
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228
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229 shade: The reference to destroy.
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230 */
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231 void fz_drop_shade_imp(fz_context *ctx, fz_storable *shade);
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232
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233 #endif