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https://github.com/michaelrsweet/pdfio.git
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140 lines
3.7 KiB
C
140 lines
3.7 KiB
C
//
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// Image example for PDFio.
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//
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// Copyright © 2023-2024 by Michael R Sweet.
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//
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// Licensed under Apache License v2.0. See the file "LICENSE" for more
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// information.
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//
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// Usage:
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//
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// ./image2pdf FILENAME.{jpg,png} FILENAME.pdf ["TEXT"]
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//
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#include <pdfio.h>
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#include <pdfio-content.h>
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#include <string.h>
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//
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// 'create_pdf_image_file()' - Create a PDF file of an image with optional caption.
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//
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bool // O - True on success, false on failure
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create_pdf_image_file(
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const char *pdfname, // I - PDF filename
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const char *imagename, // I - Image filename
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const char *caption) // I - Caption filename
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{
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pdfio_file_t *pdf; // PDF file
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pdfio_obj_t *font; // Caption font
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pdfio_obj_t *image; // Image
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pdfio_dict_t *dict; // Page dictionary
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pdfio_stream_t *page; // Page stream
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double width, height; // Width and height of image
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double swidth, sheight; // Scaled width and height on page
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double tx, ty; // Position on page
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// Create the PDF file...
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pdf = pdfioFileCreate(pdfname, /*version*/NULL, /*media_box*/NULL,
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/*crop_box*/NULL, /*error_cb*/NULL,
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/*error_cbdata*/NULL);
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if (!pdf)
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return (false);
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// Create a Courier base font for the caption
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font = pdfioFileCreateFontObjFromBase(pdf, "Courier");
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if (!font)
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{
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pdfioFileClose(pdf);
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return (false);
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}
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// Create an image object from the JPEG/PNG image file...
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image = pdfioFileCreateImageObjFromFile(pdf, imagename, true);
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if (!image)
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{
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pdfioFileClose(pdf);
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return (false);
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}
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// Create a page dictionary with the font and image...
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dict = pdfioDictCreate(pdf);
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pdfioPageDictAddFont(dict, "F1", font);
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pdfioPageDictAddImage(dict, "IM1", image);
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// Create the page and its content stream...
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page = pdfioFileCreatePage(pdf, dict);
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// Position and scale the image on the page...
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width = pdfioImageGetWidth(image);
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height = pdfioImageGetHeight(image);
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// Default media_box is "universal" 595.28x792 points (8.27x11in or
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// 210x279mm). Use margins of 36 points (0.5in or 12.7mm) with another
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// 36 points for the caption underneath...
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swidth = 595.28 - 72.0;
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sheight = swidth * height / width;
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if (sheight > (792.0 - 36.0 - 72.0))
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{
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sheight = 792.0 - 36.0 - 72.0;
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swidth = sheight * width / height;
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}
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tx = 0.5 * (595.28 - swidth);
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ty = 0.5 * (792 - 36 - sheight);
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pdfioContentDrawImage(page, "IM1", tx, ty + 36.0, swidth, sheight);
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// Draw the caption in black...
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pdfioContentSetFillColorDeviceGray(page, 0.0);
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// Compute the starting point for the text - Courier is monospaced
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// with a nominal width of 0.6 times the text height...
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tx = 0.5 * (595.28 - 18.0 * 0.6 * strlen(caption));
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// Position and draw the caption underneath...
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pdfioContentTextBegin(page);
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pdfioContentSetTextFont(page, "F1", 18.0);
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pdfioContentTextMoveTo(page, tx, ty);
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pdfioContentTextShow(page, /*unicode*/false, caption);
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pdfioContentTextEnd(page);
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// Close the page stream and the PDF file...
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pdfioStreamClose(page);
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pdfioFileClose(pdf);
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return (true);
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}
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//
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// 'main()' - Produce a single-page file from an image.
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//
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int // O - Exit status
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main(int argc, // I - Number of command-line arguments
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char *argv[]) // I - Command-line arguments
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{
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const char *imagefile, // Image filename
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*pdffile, // PDF filename
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*caption; // Caption text
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// Get the image file, PDF file, and optional caption text from the command-line...
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if (argc < 3 || argc > 4)
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{
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fputs("Usage: image2pdf FILENAME.{jpg,png} FILENAME.pdf [\"TEXT\"]\n", stderr);
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return (1);
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}
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imagefile = argv[1];
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pdffile = argv[2];
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caption = argv[3];
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return (create_pdf_image_file(imagefile, pdffile, caption) ? 0 : 1);
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}
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