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 namespace
  37 {
  38
  39 struct ImageLoaderPDF : public ImageLoaderBackend
  40 {
  41 public:
  42         ~ImageLoaderPDF() override;
  43
  44         void init(AreaUpdatedCb area_updated_cb, SizePreparedCb size_prepared_cb, AreaPreparedCb area_prepared_cb, gpointer data) override;
  45         gboolean write(const guchar *buf, gsize &chunk_size, gsize count, GError **error) override;
  46         GdkPixbuf *get_pixbuf() override;
  47         gchar *get_format_name() override;
  48         gchar **get_format_mime_types() override;
  49         void set_page_num(gint page_num) override;
  50         gint get_page_total() override;
  51
  52 private:
  53         AreaUpdatedCb area_updated_cb;
  54         gpointer data;
  55
  56         GdkPixbuf *pixbuf;
  57         gint page_num;
  58         gint page_total;
  59 };
  60
  61 gboolean ImageLoaderPDF::write(const guchar *buf, gsize &chunk_size, gsize count, GError **)
  62 {
  63         GError *poppler_error = nullptr;
  64         PopplerPage *page;
  65         PopplerDocument *document;
  66         gdouble width;
  67         gdouble height;
  68         cairo_surface_t *surface;
  69         cairo_t *cr;
  70         gboolean ret = FALSE;
  71         gint page_total;
  72
  73 #if POPPLER_CHECK_VERSION(0,82,0)
  74         GBytes *bytes = g_bytes_new_static(buf, count);
  75         document = poppler_document_new_from_bytes(bytes, nullptr, &poppler_error);
  76 #else
  77         document = poppler_document_new_from_data((gchar *)(buf), count, nullptr, &poppler_error);
  78 #endif
  79
  80         if (poppler_error)
  81                 {
  82                 log_printf("warning: pdf reader error: %s\n", poppler_error->message);
  83                 g_error_free(poppler_error);
  84                 }
  85         else
  86                 {
  87                 page_total = poppler_document_get_n_pages(document);
  88                 if (page_total > 0)
  89                         {
  90                         this->page_total = page_total;
  91                         }
  92
  93                 page = poppler_document_get_page(document, page_num);
  94                 poppler_page_get_size(page, &width, &height);
  95
  96                 surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
  97                 cr = cairo_create(surface);
  98                 poppler_page_render(page, cr);
  99
 100                 cairo_set_operator(cr, CAIRO_OPERATOR_DEST_OVER);
 101                 cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);
 102                 cairo_paint(cr);
 103
 104                 pixbuf = gdk_pixbuf_get_from_surface(surface, 0, 0, width, height);
 105                 area_updated_cb(nullptr, 0, 0, width, height, data);
 106
 107                 cairo_destroy (cr);
 108                 cairo_surface_destroy(surface);
 109                 g_object_unref(page);
 110                 chunk_size = count;
 111                 ret = TRUE;
 112                 }
 113
 114         g_object_unref(document);
 115 #if POPPLER_CHECK_VERSION(0,82,0)
 116         g_bytes_unref(bytes);
 117 #endif
 118
 119         return ret;
 120 }
 121
 122 void ImageLoaderPDF::init(AreaUpdatedCb area_updated_cb, SizePreparedCb, AreaPreparedCb, gpointer data)
 123 {
 124         this->area_updated_cb = area_updated_cb;
 125         this->data = data;
 126         page_num = 0;
 127 }
 128
 129 GdkPixbuf *ImageLoaderPDF::get_pixbuf()
 130 {
 131         return pixbuf;
 132 }
 133
 134 gchar *ImageLoaderPDF::get_format_name()
 135 {
 136         return g_strdup("pdf");
 137 }
 138
 139 gchar **ImageLoaderPDF::get_format_mime_types()
 140 {
 141         static const gchar *mime[] = {"application/pdf", nullptr};
 142         return g_strdupv(const_cast<gchar **>(mime));
 143 }
 144
 145 void ImageLoaderPDF::set_page_num(gint page_num)
 146 {
 147         this->page_num = page_num;
 148 }
 149
 150 gint ImageLoaderPDF::get_page_total()
 151 {
 152         return page_total;
 153 }
 154
 155 ImageLoaderPDF::~ImageLoaderPDF()
 156 {
 157         if (pixbuf) g_object_unref(pixbuf);
 158 }
 159
 160 } // namespace
 161
 162 std::unique_ptr<ImageLoaderBackend> get_image_loader_backend_pdf()
 163 {
 164         return std::make_unique<ImageLoaderPDF>();
 165 }
 166
 167 #endif
 168 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */