src/image-load-pdf.cc

   1 /*
   2  * Copyright (C) 20018 - The Geeqie Team
   3  *
   4  * Author: Colin Clark
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  */
  20
  21 #include "main.h"
  22
  23 #include "image-load.h"
  24 #include "image-load-pdf.h"
  25
  26 #ifdef HAVE_PDF
  27 #include <poppler/glib/poppler.h>
  28
  29 struct ImageLoaderPDF {
  30         ImageLoaderBackendCbAreaUpdated area_updated_cb;
  31         ImageLoaderBackendCbSize size_cb;
  32         ImageLoaderBackendCbAreaPrepared area_prepared_cb;
  33         gpointer data;
  34         GdkPixbuf *pixbuf;
  35         guint requested_width;
  36         guint requested_height;
  37         gboolean abort;
  38         gint page_num;
  39         gint page_total;
  40 };
  41
  42 static gboolean image_loader_pdf_load(gpointer loader, const guchar *buf, gsize count, GError **)
  43 {
  44         auto ld = static_cast<ImageLoaderPDF *>(loader);
  45         GError *poppler_error = nullptr;
  46         PopplerPage *page;
  47         PopplerDocument *document;
  48         gdouble width;
  49         gdouble height;
  50         cairo_surface_t *surface;
  51         cairo_t *cr;
  52         gboolean ret = FALSE;
  53         gint page_total;
  54
  55         document = poppler_document_new_from_data((gchar *)(buf), count, nullptr, &poppler_error);
  56
  57         if (poppler_error)
  58                 {
  59                 log_printf("warning: pdf reader error: %s\n", poppler_error->message);
  60                 g_error_free(poppler_error);
  61                 }
  62         else
  63                 {
  64                 page_total = poppler_document_get_n_pages(document);
  65                 if (page_total > 0)
  66                         {
  67                         ld->page_total = page_total;
  68                         }
  69
  70                 page = poppler_document_get_page(document, ld->page_num);
  71                 poppler_page_get_size(page, &width, &height);
  72
  73                 surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
  74                 cr = cairo_create(surface);
  75                 poppler_page_render(page, cr);
  76
  77                 cairo_set_operator(cr, CAIRO_OPERATOR_DEST_OVER);
  78                 cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);
  79                 cairo_paint(cr);
  80
  81                 ld->pixbuf = gdk_pixbuf_get_from_surface(surface, 0, 0, width, height);
  82                 ld->area_updated_cb(loader, 0, 0, width, height, ld->data);
  83
  84                 cairo_destroy (cr);
  85                 cairo_surface_destroy(surface);
  86                 g_object_unref(page);
  87                 ret = TRUE;
  88                 }
  89
  90         g_object_unref(document);
  91
  92         return ret;
  93 }
  94
  95 static gpointer image_loader_pdf_new(ImageLoaderBackendCbAreaUpdated area_updated_cb, ImageLoaderBackendCbSize size_cb, ImageLoaderBackendCbAreaPrepared area_prepared_cb, gpointer data)
  96 {
  97         auto loader = g_new0(ImageLoaderPDF, 1);
  98         loader->area_updated_cb = area_updated_cb;
  99         loader->size_cb = size_cb;
 100         loader->area_prepared_cb = area_prepared_cb;
 101         loader->data = data;
 102         loader->page_num = 0;
 103         return loader;
 104 }
 105
 106 static void image_loader_pdf_set_size(gpointer loader, int width, int height)
 107 {
 108         auto ld = static_cast<ImageLoaderPDF *>(loader);
 109         ld->requested_width = width;
 110         ld->requested_height = height;
 111 }
 112
 113 static GdkPixbuf* image_loader_pdf_get_pixbuf(gpointer loader)
 114 {
 115         auto ld = static_cast<ImageLoaderPDF *>(loader);
 116         return ld->pixbuf;
 117 }
 118
 119 static gchar* image_loader_pdf_get_format_name(gpointer)
 120 {
 121         return g_strdup("pdf");
 122 }
 123
 124 static gchar** image_loader_pdf_get_format_mime_types(gpointer)
 125 {
 126         static const gchar *mime[] = {"application/pdf", nullptr};
 127         return g_strdupv(const_cast<gchar **>(mime));
 128 }
 129
 130 static void image_loader_pdf_set_page_num(gpointer loader, gint page_num)
 131 {
 132         auto ld = static_cast<ImageLoaderPDF *>(loader);
 133
 134         ld->page_num = page_num;
 135 }
 136
 137 static gint image_loader_pdf_get_page_total(gpointer loader)
 138 {
 139         auto ld = static_cast<ImageLoaderPDF *>(loader);
 140
 141         return ld->page_total;
 142 }
 143
 144 static gboolean image_loader_pdf_close(gpointer, GError **)
 145 {
 146         return TRUE;
 147 }
 148
 149 static void image_loader_pdf_abort(gpointer loader)
 150 {
 151         auto ld = static_cast<ImageLoaderPDF *>(loader);
 152         ld->abort = TRUE;
 153 }
 154
 155 static void image_loader_pdf_free(gpointer loader)
 156 {
 157         auto ld = static_cast<ImageLoaderPDF *>(loader);
 158         if (ld->pixbuf) g_object_unref(ld->pixbuf);
 159         g_free(ld);
 160 }
 161
 162 void image_loader_backend_set_pdf(ImageLoaderBackend *funcs)
 163 {
 164         funcs->loader_new = image_loader_pdf_new;
 165         funcs->set_size = image_loader_pdf_set_size;
 166         funcs->load = image_loader_pdf_load;
 167         funcs->write = nullptr;
 168         funcs->get_pixbuf = image_loader_pdf_get_pixbuf;
 169         funcs->close = image_loader_pdf_close;
 170         funcs->abort = image_loader_pdf_abort;
 171         funcs->free = image_loader_pdf_free;
 172         funcs->get_format_name = image_loader_pdf_get_format_name;
 173         funcs->get_format_mime_types = image_loader_pdf_get_format_mime_types;
 174         funcs->set_page_num = image_loader_pdf_set_page_num;
 175         funcs->get_page_total = image_loader_pdf_get_page_total;
 176 }
 177
 178 #endif
 179 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */