print: Use Poppler to render pages to print

.github/workflows/test.yml

@@ -15,6 +15,7 @@ jobs:
           apt-get update
           apt-get upgrade -y
           apt-get build-dep -y xdg-desktop-portal-gtk
+          apt-get install -y libpoppler-glib-dev
 
       - uses: actions/checkout@v2
 

configure.ac

@@ -109,10 +109,14 @@ if test x$enable_lockdown = xyes; then
 fi
 AM_CONDITIONAL([BUILD_LOCKDOWN],[test "$enable_lockdown" = "yes"])
 
-PKG_CHECK_MODULES(GTK, [xdg-desktop-portal >= 1.5 glib-2.0 >= 2.44 gio-unix-2.0 gtk+-3.0 >= 3.14 gtk+-unix-print-3.0])
+PKG_CHECK_MODULES(GTK, [xdg-desktop-portal >= 1.5 glib-2.0 >= 2.44 gio-unix-2.0 gtk+-3.0 >= 3.14 gtk+-unix-print-3.0 ])
 AC_SUBST(GTK_CFLAGS)
 AC_SUBST(GTK_LIBS)
 
+PKG_CHECK_MODULES(POPPLER, [ gtk+-3.0 >= 3.14 gio-unix-2.0 poppler >= 0.16.7 poppler-glib >= 0.16.7 ])
+AC_SUBST(POPPLER_CFLAGS)
+AC_SUBST(POPPLER_LIBS)
+
 PKG_CHECK_MODULES(GTK_X11, gtk+-x11-3.0,
 		  have_gtk_x11=yes, have_gtk_x11=no)
 if test "$have_gtk_x11" = "yes"; then

src/Makefile.am.inc

@@ -112,6 +112,7 @@ EXTRA_DIST += \
 
 libexec_PROGRAMS = \
 	xdg-desktop-portal-gtk \
+	pdftoraw \
 	$(NULL)
 
 xdg_desktop_portal_gtk_SOURCES = \
@@ -285,3 +286,14 @@ testappchooser_SOURCES = \
 nodist_testappchooser_SOURCES = \
 	src/resources.c				\
 	$(NULL)
+
+pdftoraw_SOURCES = \
+	src/pdftoraw.c \
+	$(NULL)
+
+pdftoraw_LDADD = $(BASE_LIBS) $(POPPLER_LIBS) -lm
+pdftoraw_CFLAGS = $(BASE_CFLAGS) $(POPPLER_CFLAGS)
+pdftoraw_CPPFLAGS = \
+	-I$(top_srcdir)/src				\
+	-I$(top_builddir)/src			\
+	$(NULL)

src/pdftoraw.c

@@ -0,0 +1,189 @@
+/*
+ * Copyright (C) 2021 Thierry HUCHARD <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <unistd.h>
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <gio/gio.h>
+#include <poppler.h>
+#include <gdk/gdk.h>
+
+#define DPI 150.0
+
+static struct option long_options[] = {
+    {"file",     required_argument, 0,  'f' },
+    {"pages",    no_argument,       0,  'p' },
+    {"test",     no_argument,       0,  't' },
+    {"width",    required_argument, 0,  'w' },
+    {"height",   required_argument, 0,  'W' },
+    {"raw",      required_argument, 0,  'r' },
+    {"help",     no_argument,       0,  'h' },
+    {0,          0,                 0,  0   }
+};
+
+static void
+print_usage(void) {
+    printf("Usage:\tpdftoraw  --filename=<filename>  --raw=<num-page>\n");
+    printf("\tpdftoraw  --filename=<filename>  --pages\n");
+    printf("\tpdftoraw  --filename=<filename>  --width=<num-page>\n");
+    printf("\tpdftoraw  --filename=<filename>  --height=<num-page>\n");
+    printf("\tpdftoraw  --help\n");
+}
+
+static int
+pdf_number_pages_get(PopplerDocument *doc)
+{
+    return poppler_document_get_n_pages(doc);
+}
+
+static unsigned char*
+pdf_page_raw_get(PopplerDocument *doc,
+                 int page_nr)
+{
+    cairo_surface_t *s = NULL;
+    cairo_t *cr = NULL;
+    unsigned char *data = NULL;
+    GdkPixbuf *pix = NULL;
+    double width = 0;
+    double height = 0;
+    int w = 0;
+    int h = 0;
+
+    PopplerPage *page = poppler_document_get_page(doc, page_nr);
+    poppler_page_get_size(page, &width, &height);
+    width = DPI * width / 72.0;
+    height = DPI * height / 72.0;
+    w = (int)ceil(width);
+    h = (int)ceil(height);
+    s = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, w, h);
+    cr = cairo_create(s);
+    cairo_scale (cr, DPI/72.0, DPI/72.0);
+    cairo_save (cr);
+    poppler_page_render_for_printing(page, cr);
+    cairo_restore (cr);
+    pix = gdk_pixbuf_get_from_surface(s, 0, 0, w, h);
+    g_object_unref(page);
+    data = gdk_pixbuf_get_pixels (pix);
+    fwrite(data, 1, (w * h * 4), stdout);
+    return data;
+}
+
+static int
+pdf_page_width_get(PopplerDocument *doc,
+                   int page_nr)
+{
+    double width = 0;
+    int w = 0;
+
+    PopplerPage *page = poppler_document_get_page(doc, page_nr);
+    poppler_page_get_size(page, &width, NULL);
+    width = DPI * width / 72.0;
+    w = (int)ceil(width);
+    g_object_unref(page);
+    return w;
+}
+
+static int
+pdf_page_height_get(PopplerDocument *doc,
+                    int page_nr)
+{
+    double height = 0;
+    int h = 0;
+
+    PopplerPage *page = poppler_document_get_page(doc, page_nr);
+    poppler_page_get_size(page, NULL, &height);
+    height = DPI * height / 72.0;
+    h = (int)ceil(height);
+    g_object_unref(page);
+    return h;
+}
+
+int
+main(int argc, char **argv)
+{
+    PopplerDocument *doc = NULL;
+    GError *err = NULL;
+    GFile *in = NULL;
+    char *filename = NULL;
+    int long_index =0;
+    int page = 0;
+    int opt= 0;
+    int test = 0, raw = 0, npages = 0, width = 0, height = 0;
+
+    while ((opt = getopt_long(argc, argv,"f:tpw:W:r:h",
+                   long_options, &long_index )) != -1) {
+        switch (opt) {
+             case 'f' :
+                 filename = strdup(optarg);
+                 break;
+             case 't' :
+                 test = 1;
+                 break;
+             case 'p' :
+                 npages = 1;
+                 break;
+             case 'w' : page = atoi(optarg);
+                 width = 1;
+                 break;
+             case 'W' : page = atoi(optarg);
+                 height = 1;
+                 break;
+             case 'r' : page = atoi(optarg);
+                 raw = 1;
+                 break;
+             default: print_usage();
+                 exit(EXIT_FAILURE);
+        }
+    }
+    if (filename == NULL) {
+        print_usage();
+        exit(EXIT_FAILURE);
+    }
+    in = g_file_new_for_path(filename);
+    doc = poppler_document_new_from_gfile(in, NULL, NULL, &err);
+    if (err)
+    {
+       g_error_free(err);
+       g_object_unref(in);
+       exit(EXIT_FAILURE);
+    }
+
+    if (test == 1) {
+        printf("1");
+    }
+    else if (raw == 1) {
+        pdf_page_raw_get(doc, page);
+    }
+    else if (npages == 1) {
+        printf("%d", pdf_number_pages_get(doc));
+    }
+    else if (width == 1) {
+        printf("%d", pdf_page_width_get(doc, page));
+    }
+    else if (height == 1) {
+        printf("%d", pdf_page_height_get(doc, page));
+    }
+    else {
+        print_usage();
+        exit(EXIT_FAILURE);
+    }
+    g_object_unref(doc);
+    return 0;
+}
+