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 {
  40         ImageLoaderBackendCbAreaUpdated area_updated_cb;
  41         ImageLoaderBackendCbSize size_cb;
  42         ImageLoaderBackendCbAreaPrepared area_prepared_cb;
  43         gpointer data;
  44         GdkPixbuf *pixbuf;
  45         guint requested_width;
  46         guint requested_height;
  47         gboolean abort;
  48         gint page_num;
  49         gint page_total;
  50 };
  51
  52 gboolean image_loader_pdf_write(gpointer loader, const guchar *buf, gsize &chunk_size, gsize count, GError **)
  53 {
  54         auto ld = static_cast<ImageLoaderPDF *>(loader);
  55         GError *poppler_error = nullptr;
  56         PopplerPage *page;
  57         PopplerDocument *document;
  58         gdouble width;
  59         gdouble height;
  60         cairo_surface_t *surface;
  61         cairo_t *cr;
  62         gboolean ret = FALSE;
  63         gint page_total;
  64
  65         document = poppler_document_new_from_data((gchar *)(buf), count, nullptr, &poppler_error);
  66
  67         if (poppler_error)
  68                 {
  69                 log_printf("warning: pdf reader error: %s\n", poppler_error->message);
  70                 g_error_free(poppler_error);
  71                 }
  72         else
  73                 {
  74                 page_total = poppler_document_get_n_pages(document);
  75                 if (page_total > 0)
  76                         {
  77                         ld->page_total = page_total;
  78                         }
  79
  80                 page = poppler_document_get_page(document, ld->page_num);
  81                 poppler_page_get_size(page, &width, &height);
  82
  83                 surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
  84                 cr = cairo_create(surface);
  85                 poppler_page_render(page, cr);
  86
  87                 cairo_set_operator(cr, CAIRO_OPERATOR_DEST_OVER);
  88                 cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);
  89                 cairo_paint(cr);
  90
  91                 ld->pixbuf = gdk_pixbuf_get_from_surface(surface, 0, 0, width, height);
  92                 ld->area_updated_cb(loader, 0, 0, width, height, ld->data);
  93
  94                 cairo_destroy (cr);
  95                 cairo_surface_destroy(surface);
  96                 g_object_unref(page);
  97                 chunk_size = count;
  98                 ret = TRUE;
  99                 }
 100
 101         g_object_unref(document);
 102
 103         return ret;
 104 }
 105
 106 gpointer image_loader_pdf_new(ImageLoaderBackendCbAreaUpdated area_updated_cb, ImageLoaderBackendCbSize size_cb, ImageLoaderBackendCbAreaPrepared area_prepared_cb, gpointer data)
 107 {
 108         auto loader = g_new0(ImageLoaderPDF, 1);
 109         loader->area_updated_cb = area_updated_cb;
 110         loader->size_cb = size_cb;
 111         loader->area_prepared_cb = area_prepared_cb;
 112         loader->data = data;
 113         loader->page_num = 0;
 114         return loader;
 115 }
 116
 117 void image_loader_pdf_set_size(gpointer loader, int width, int height)
 118 {
 119         auto ld = static_cast<ImageLoaderPDF *>(loader);
 120         ld->requested_width = width;
 121         ld->requested_height = height;
 122 }
 123
 124 GdkPixbuf* image_loader_pdf_get_pixbuf(gpointer loader)
 125 {
 126         auto ld = static_cast<ImageLoaderPDF *>(loader);
 127         return ld->pixbuf;
 128 }
 129
 130 gchar* image_loader_pdf_get_format_name(gpointer)
 131 {
 132         return g_strdup("pdf");
 133 }
 134
 135 gchar** image_loader_pdf_get_format_mime_types(gpointer)
 136 {
 137         static const gchar *mime[] = {"application/pdf", nullptr};
 138         return g_strdupv(const_cast<gchar **>(mime));
 139 }
 140
 141 void image_loader_pdf_set_page_num(gpointer loader, gint page_num)
 142 {
 143         auto ld = static_cast<ImageLoaderPDF *>(loader);
 144
 145         ld->page_num = page_num;
 146 }
 147
 148 gint image_loader_pdf_get_page_total(gpointer loader)
 149 {
 150         auto ld = static_cast<ImageLoaderPDF *>(loader);
 151
 152         return ld->page_total;
 153 }
 154
 155 gboolean image_loader_pdf_close(gpointer, GError **)
 156 {
 157         return TRUE;
 158 }
 159
 160 void image_loader_pdf_abort(gpointer loader)
 161 {
 162         auto ld = static_cast<ImageLoaderPDF *>(loader);
 163         ld->abort = TRUE;
 164 }
 165
 166 void image_loader_pdf_free(gpointer loader)
 167 {
 168         auto ld = static_cast<ImageLoaderPDF *>(loader);
 169         if (ld->pixbuf) g_object_unref(ld->pixbuf);
 170         g_free(ld);
 171 }
 172
 173 } // namespace
 174
 175 void image_loader_backend_set_pdf(ImageLoaderBackend *funcs)
 176 {
 177         funcs->loader_new = image_loader_pdf_new;
 178         funcs->set_size = image_loader_pdf_set_size;
 179         funcs->write = image_loader_pdf_write;
 180         funcs->get_pixbuf = image_loader_pdf_get_pixbuf;
 181         funcs->close = image_loader_pdf_close;
 182         funcs->abort = image_loader_pdf_abort;
 183         funcs->free = image_loader_pdf_free;
 184         funcs->get_format_name = image_loader_pdf_get_format_name;
 185         funcs->get_format_mime_types = image_loader_pdf_get_format_mime_types;
 186         funcs->set_page_num = image_loader_pdf_set_page_num;
 187         funcs->get_page_total = image_loader_pdf_get_page_total;
 188 }
 189
 190 #endif
 191 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */