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