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 <config.h>
  22
  23 #if HAVE_PDF
  24 #include "image-load-pdf.h"
  25
  26 #include <cairo.h>
  27 #include <gdk-pixbuf/gdk-pixbuf.h>
  28 #include <gdk/gdk.h>
  29 #include <glib-object.h>
  30 #include <glib.h>
  31 #include <poppler.h>
  32
  33 #include "debug.h"
  34 #include "image-load.h"
  35
  36 struct ImageLoaderPDF {
  37         ImageLoaderBackendCbAreaUpdated area_updated_cb;
  38         ImageLoaderBackendCbSize size_cb;
  39         ImageLoaderBackendCbAreaPrepared area_prepared_cb;
  40         gpointer data;
  41         GdkPixbuf *pixbuf;
  42         guint requested_width;
  43         guint requested_height;
  44         gboolean abort;
  45         gint page_num;
  46         gint page_total;
  47 };
  48
  49 static gboolean image_loader_pdf_load(gpointer loader, const guchar *buf, gsize count, GError **)
  50 {
  51         auto ld = static_cast<ImageLoaderPDF *>(loader);
  52         GError *poppler_error = nullptr;
  53         PopplerPage *page;
  54         PopplerDocument *document;
  55         gdouble width;
  56         gdouble height;
  57         cairo_surface_t *surface;
  58         cairo_t *cr;
  59         gboolean ret = FALSE;
  60         gint page_total;
  61
  62         document = poppler_document_new_from_data((gchar *)(buf), count, nullptr, &poppler_error);
  63
  64         if (poppler_error)
  65                 {
  66                 log_printf("warning: pdf reader error: %s\n", poppler_error->message);
  67                 g_error_free(poppler_error);
  68                 }
  69         else
  70                 {
  71                 page_total = poppler_document_get_n_pages(document);
  72                 if (page_total > 0)
  73                         {
  74                         ld->page_total = page_total;
  75                         }
  76
  77                 page = poppler_document_get_page(document, ld->page_num);
  78                 poppler_page_get_size(page, &width, &height);
  79
  80                 surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
  81                 cr = cairo_create(surface);
  82                 poppler_page_render(page, cr);
  83
  84                 cairo_set_operator(cr, CAIRO_OPERATOR_DEST_OVER);
  85                 cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);
  86                 cairo_paint(cr);
  87
  88                 ld->pixbuf = gdk_pixbuf_get_from_surface(surface, 0, 0, width, height);
  89                 ld->area_updated_cb(loader, 0, 0, width, height, ld->data);
  90
  91                 cairo_destroy (cr);
  92                 cairo_surface_destroy(surface);
  93                 g_object_unref(page);
  94                 ret = TRUE;
  95                 }
  96
  97         g_object_unref(document);
  98
  99         return ret;
 100 }
 101
 102 static gpointer image_loader_pdf_new(ImageLoaderBackendCbAreaUpdated area_updated_cb, ImageLoaderBackendCbSize size_cb, ImageLoaderBackendCbAreaPrepared area_prepared_cb, gpointer data)
 103 {
 104         auto loader = g_new0(ImageLoaderPDF, 1);
 105         loader->area_updated_cb = area_updated_cb;
 106         loader->size_cb = size_cb;
 107         loader->area_prepared_cb = area_prepared_cb;
 108         loader->data = data;
 109         loader->page_num = 0;
 110         return loader;
 111 }
 112
 113 static void image_loader_pdf_set_size(gpointer loader, int width, int height)
 114 {
 115         auto ld = static_cast<ImageLoaderPDF *>(loader);
 116         ld->requested_width = width;
 117         ld->requested_height = height;
 118 }
 119
 120 static GdkPixbuf* image_loader_pdf_get_pixbuf(gpointer loader)
 121 {
 122         auto ld = static_cast<ImageLoaderPDF *>(loader);
 123         return ld->pixbuf;
 124 }
 125
 126 static gchar* image_loader_pdf_get_format_name(gpointer)
 127 {
 128         return g_strdup("pdf");
 129 }
 130
 131 static gchar** image_loader_pdf_get_format_mime_types(gpointer)
 132 {
 133         static const gchar *mime[] = {"application/pdf", nullptr};
 134         return g_strdupv(const_cast<gchar **>(mime));
 135 }
 136
 137 static void image_loader_pdf_set_page_num(gpointer loader, gint page_num)
 138 {
 139         auto ld = static_cast<ImageLoaderPDF *>(loader);
 140
 141         ld->page_num = page_num;
 142 }
 143
 144 static gint image_loader_pdf_get_page_total(gpointer loader)
 145 {
 146         auto ld = static_cast<ImageLoaderPDF *>(loader);
 147
 148         return ld->page_total;
 149 }
 150
 151 static gboolean image_loader_pdf_close(gpointer, GError **)
 152 {
 153         return TRUE;
 154 }
 155
 156 static void image_loader_pdf_abort(gpointer loader)
 157 {
 158         auto ld = static_cast<ImageLoaderPDF *>(loader);
 159         ld->abort = TRUE;
 160 }
 161
 162 static void image_loader_pdf_free(gpointer loader)
 163 {
 164         auto ld = static_cast<ImageLoaderPDF *>(loader);
 165         if (ld->pixbuf) g_object_unref(ld->pixbuf);
 166         g_free(ld);
 167 }
 168
 169 void image_loader_backend_set_pdf(ImageLoaderBackend *funcs)
 170 {
 171         funcs->loader_new = image_loader_pdf_new;
 172         funcs->set_size = image_loader_pdf_set_size;
 173         funcs->load = image_loader_pdf_load;
 174         funcs->write = nullptr;
 175         funcs->get_pixbuf = image_loader_pdf_get_pixbuf;
 176         funcs->close = image_loader_pdf_close;
 177         funcs->abort = image_loader_pdf_abort;
 178         funcs->free = image_loader_pdf_free;
 179         funcs->get_format_name = image_loader_pdf_get_format_name;
 180         funcs->get_format_mime_types = image_loader_pdf_get_format_mime_types;
 181         funcs->set_page_num = image_loader_pdf_set_page_num;
 182         funcs->get_page_total = image_loader_pdf_get_page_total;
 183 }
 184
 185 #endif
 186 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */