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f74b11415a
In order to support blend modes, we need to use a clear background whilst rendering the PDF, which inspired the use of DEST_OVER to avoid having to render to an intermediate surface. However, the adjunct of using subpixel text means that we cannot simply using the alpha channel as the sole mask and so need to render to an intermediate and paint it over an opaque background.
99 lines
3 KiB
C
99 lines
3 KiB
C
/*
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* Copyright © 2005 Red Hat, Inc.
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*
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* Permission to use, copy, modify, distribute, and sell this software
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* and its documentation for any purpose is hereby granted without
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* fee, provided that the above copyright notice appear in all copies
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* and that both that copyright notice and this permission notice
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* appear in supporting documentation, and that the name of
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* Red Hat, Inc. not be used in advertising or publicity pertaining to
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* distribution of the software without specific, written prior
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* permission. Red Hat, Inc. makes no representations about the
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* suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
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* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,
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* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
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* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
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* IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Author: Kristian Høgsberg <krh@redhat.com>
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <poppler.h>
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#define FAIL(msg) \
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do { fprintf (stderr, "FAIL: %s\n", msg); exit (-1); } while (0)
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#define PIXELS_PER_POINT 1
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int main (int argc, char *argv[])
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{
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PopplerDocument *document;
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PopplerPage *page;
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double width, height;
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const char *filename = argv[1];
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const char *output_filename = argv[2];
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const char *page_label = argv[3];
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gchar *absolute, *uri;
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cairo_surface_t *surface;
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cairo_t *cr;
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cairo_status_t status;
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GError *error = NULL;
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if (argc != 4)
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FAIL ("usage: pdf2png input_file.pdf output_file.png page");
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g_type_init ();
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if (g_path_is_absolute(filename)) {
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absolute = g_strdup (filename);
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} else {
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gchar *dir = g_get_current_dir ();
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absolute = g_build_filename (dir, filename, (gchar *) 0);
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g_free (dir);
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}
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uri = g_filename_to_uri (absolute, NULL, &error);
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g_free (absolute);
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if (uri == NULL)
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FAIL (error->message);
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document = poppler_document_new_from_file (uri, NULL, &error);
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if (document == NULL)
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FAIL (error->message);
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page = poppler_document_get_page_by_label (document, page_label);
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if (page == NULL)
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FAIL ("page not found");
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poppler_page_get_size (page, &width, &height);
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surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, width, height);
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cr = cairo_create (surface);
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cairo_surface_destroy (surface);
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cairo_set_source_rgb (cr, 1,1,1);
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cairo_paint (cr);
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cairo_push_group_with_content (cr, CAIRO_CONTENT_COLOR_ALPHA);
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poppler_page_render (page, cr);
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g_object_unref (page);
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cairo_pop_group_to_source (cr);
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cairo_paint (cr);
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status = cairo_surface_write_to_png (cairo_get_target (cr),
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output_filename);
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cairo_destroy (cr);
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if (status)
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FAIL (cairo_status_to_string (status));
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return 0;
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}
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