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 "image-load-pdf.h"
  22
  23 #include <cairo.h>
  24 #include <gdk-pixbuf/gdk-pixbuf.h>
  25 #include <gdk/gdk.h>
  26 #include <glib-object.h>
  27 #include <glib.h>
  28 #include <poppler.h>
  29
  30 #include "debug.h"
  31 #include "image-load.h"
  32
  33 namespace
  34 {
  35
  36 struct ImageLoaderPDF : public ImageLoaderBackend
  37 {
  38 public:
  39         ~ImageLoaderPDF() override;
  40
  41         void init(AreaUpdatedCb area_updated_cb, SizePreparedCb size_prepared_cb, AreaPreparedCb area_prepared_cb, gpointer data) override;
  42         gboolean write(const guchar *buf, gsize &chunk_size, gsize count, GError **error) override;
  43         GdkPixbuf *get_pixbuf() override;
  44         gchar *get_format_name() override;
  45         gchar **get_format_mime_types() override;
  46         void set_page_num(gint page_num) override;
  47         gint get_page_total() override;
  48
  49 private:
  50         AreaUpdatedCb area_updated_cb;
  51         gpointer data;
  52
  53         GdkPixbuf *pixbuf;
  54         gint page_num;
  55         gint page_total;
  56 };
  57
  58 gboolean ImageLoaderPDF::write(const guchar *buf, gsize &chunk_size, gsize count, GError **)
  59 {
  60         GError *poppler_error = nullptr;
  61         PopplerPage *page;
  62         PopplerDocument *document;
  63         gdouble width;
  64         gdouble height;
  65         cairo_surface_t *surface;
  66         cairo_t *cr;
  67         gboolean ret = FALSE;
  68         gint page_total;
  69
  70 #if POPPLER_CHECK_VERSION(0,82,0)
  71         GBytes *bytes = g_bytes_new_static(buf, count);
  72         document = poppler_document_new_from_bytes(bytes, nullptr, &poppler_error);
  73 #else
  74         document = poppler_document_new_from_data((gchar *)(buf), count, nullptr, &poppler_error);
  75 #endif
  76
  77         if (poppler_error)
  78                 {
  79                 log_printf("warning: pdf reader error: %s\n", poppler_error->message);
  80                 g_error_free(poppler_error);
  81                 }
  82         else
  83                 {
  84                 page_total = poppler_document_get_n_pages(document);
  85                 if (page_total > 0)
  86                         {
  87                         this->page_total = page_total;
  88                         }
  89
  90                 page = poppler_document_get_page(document, page_num);
  91                 poppler_page_get_size(page, &width, &height);
  92
  93                 surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
  94                 cr = cairo_create(surface);
  95                 poppler_page_render(page, cr);
  96
  97                 cairo_set_operator(cr, CAIRO_OPERATOR_DEST_OVER);
  98                 cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);
  99                 cairo_paint(cr);
 100
 101                 pixbuf = gdk_pixbuf_get_from_surface(surface, 0, 0, width, height);
 102                 area_updated_cb(nullptr, 0, 0, width, height, data);
 103
 104                 cairo_destroy (cr);
 105                 cairo_surface_destroy(surface);
 106                 g_object_unref(page);
 107                 chunk_size = count;
 108                 ret = TRUE;
 109                 }
 110
 111         g_object_unref(document);
 112 #if POPPLER_CHECK_VERSION(0,82,0)
 113         g_bytes_unref(bytes);
 114 #endif
 115
 116         return ret;
 117 }
 118
 119 void ImageLoaderPDF::init(AreaUpdatedCb area_updated_cb, SizePreparedCb, AreaPreparedCb, gpointer data)
 120 {
 121         this->area_updated_cb = area_updated_cb;
 122         this->data = data;
 123         page_num = 0;
 124 }
 125
 126 GdkPixbuf *ImageLoaderPDF::get_pixbuf()
 127 {
 128         return pixbuf;
 129 }
 130
 131 gchar *ImageLoaderPDF::get_format_name()
 132 {
 133         return g_strdup("pdf");
 134 }
 135
 136 gchar **ImageLoaderPDF::get_format_mime_types()
 137 {
 138         static const gchar *mime[] = {"application/pdf", nullptr};
 139         return g_strdupv(const_cast<gchar **>(mime));
 140 }
 141
 142 void ImageLoaderPDF::set_page_num(gint page_num)
 143 {
 144         this->page_num = page_num;
 145 }
 146
 147 gint ImageLoaderPDF::get_page_total()
 148 {
 149         return page_total;
 150 }
 151
 152 ImageLoaderPDF::~ImageLoaderPDF()
 153 {
 154         if (pixbuf) g_object_unref(pixbuf);
 155 }
 156
 157 } // namespace
 158
 159 std::unique_ptr<ImageLoaderBackend> get_image_loader_backend_pdf()
 160 {
 161         return std::make_unique<ImageLoaderPDF>();
 162 }
 163
 164 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */