Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/docs/examples/example.c @ 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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2
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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1 /*
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2 How to use MuPDF to render a single page and print the result as
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3 a PPM to stdout.
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4
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5 To build this example in a source tree and render first page at
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6 100% zoom with no rotation, run:
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7 make examples
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8 ./build/debug/example document.pdf 1 100 0 > page1.ppm
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9
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10 To build from installed sources, and render the same document, run:
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11 gcc -I/usr/local/include -o example \
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12 /usr/local/share/doc/mupdf/examples/example.c \
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13 /usr/local/lib/libmupdf.a \
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14 /usr/local/lib/libmupdfthird.a \
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15 -lm
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16 ./example document.pdf 1 100 0 > page1.ppm
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17 */
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18
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19 #include <mupdf/fitz.h>
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20
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21 #include <stdio.h>
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22 #include <stdlib.h>
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23
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24 int main(int argc, char **argv)
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25 {
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26 char *input;
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27 float zoom, rotate;
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28 int page_number, page_count;
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29 fz_context *ctx;
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30 fz_document *doc;
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31 fz_pixmap *pix;
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32 fz_matrix ctm;
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33 int x, y;
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34
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35 if (argc < 3)
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36 {
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37 fprintf(stderr, "usage: example input-file page-number [ zoom [ rotate ] ]\n");
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38 fprintf(stderr, "\tinput-file: path of PDF, XPS, CBZ or EPUB document to open\n");
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39 fprintf(stderr, "\tPage numbering starts from one.\n");
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40 fprintf(stderr, "\tZoom level is in percent (100 percent is 72 dpi).\n");
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41 fprintf(stderr, "\tRotation is in degrees clockwise.\n");
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42 return EXIT_FAILURE;
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43 }
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45 input = argv[1];
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46 page_number = atoi(argv[2]) - 1;
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47 zoom = argc > 3 ? atof(argv[3]) : 100;
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48 rotate = argc > 4 ? atof(argv[4]) : 0;
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49
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50 /* Create a context to hold the exception stack and various caches. */
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51 ctx = fz_new_context(NULL, NULL, FZ_STORE_UNLIMITED);
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52 if (!ctx)
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53 {
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54 fprintf(stderr, "cannot create mupdf context\n");
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55 return EXIT_FAILURE;
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56 }
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57
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58 /* Register the default file types to handle. */
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59 fz_try(ctx)
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60 fz_register_document_handlers(ctx);
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61 fz_catch(ctx)
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62 {
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63 fz_report_error(ctx);
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64 fprintf(stderr, "cannot register document handlers\n");
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65 fz_drop_context(ctx);
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66 return EXIT_FAILURE;
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67 }
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69 /* Open the document. */
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70 fz_try(ctx)
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71 doc = fz_open_document(ctx, input);
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72 fz_catch(ctx)
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73 {
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74 fz_report_error(ctx);
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75 fprintf(stderr, "cannot open document\n");
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76 fz_drop_context(ctx);
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77 return EXIT_FAILURE;
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78 }
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79
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80 /* Count the number of pages. */
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81 fz_try(ctx)
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82 page_count = fz_count_pages(ctx, doc);
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83 fz_catch(ctx)
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84 {
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85 fz_report_error(ctx);
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86 fprintf(stderr, "cannot count number of pages\n");
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87 fz_drop_document(ctx, doc);
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88 fz_drop_context(ctx);
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89 return EXIT_FAILURE;
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90 }
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91
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92 if (page_number < 0 || page_number >= page_count)
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93 {
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94 fprintf(stderr, "page number out of range: %d (page count %d)\n", page_number + 1, page_count);
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95 fz_drop_document(ctx, doc);
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96 fz_drop_context(ctx);
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97 return EXIT_FAILURE;
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98 }
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99
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100 /* Compute a transformation matrix for the zoom and rotation desired. */
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101 /* The default resolution without scaling is 72 dpi. */
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102 ctm = fz_scale(zoom / 100, zoom / 100);
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103 ctm = fz_pre_rotate(ctm, rotate);
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104
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105 /* Render page to an RGB pixmap. */
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106 fz_try(ctx)
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107 pix = fz_new_pixmap_from_page_number(ctx, doc, page_number, ctm, fz_device_rgb(ctx), 0);
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108 fz_catch(ctx)
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109 {
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110 fz_report_error(ctx);
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111 fprintf(stderr, "cannot render page\n");
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112 fz_drop_document(ctx, doc);
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113 fz_drop_context(ctx);
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114 return EXIT_FAILURE;
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115 }
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116
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117 /* Print image data in ascii PPM format. */
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118 printf("P3\n");
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119 printf("%d %d\n", pix->w, pix->h);
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120 printf("255\n");
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121 for (y = 0; y < pix->h; ++y)
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122 {
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123 unsigned char *p = &pix->samples[y * pix->stride];
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124 for (x = 0; x < pix->w; ++x)
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125 {
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126 if (x > 0)
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127 printf(" ");
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128 printf("%3d %3d %3d", p[0], p[1], p[2]);
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129 p += pix->n;
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130 }
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131 printf("\n");
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132 }
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133
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134 /* Clean up. */
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135 fz_drop_pixmap(ctx, pix);
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136 fz_drop_document(ctx, doc);
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137 fz_drop_context(ctx);
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138 return EXIT_SUCCESS;
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139 }