src/image-load-heif.cc

   1 /*
   2  * Copyright (C) 20019 - 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-heif.h"
  22
  23 #include <config.h>
  24
  25 #if HAVE_HEIF
  26 #include <vector>
  27
  28 #include <gdk-pixbuf/gdk-pixbuf.h>
  29 #include <glib-object.h>
  30 #include <glib.h>
  31 #include <libheif/heif.h>
  32
  33 #include "debug.h"
  34 #include "image-load.h"
  35
  36 namespace
  37 {
  38
  39 struct ImageLoaderHEIF : public ImageLoaderBackend
  40 {
  41 public:
  42         ~ImageLoaderHEIF() 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 void free_buffer(guchar *, gpointer data)
  62 {
  63         heif_image_release(static_cast<const struct heif_image*>(data));
  64 }
  65
  66 gboolean ImageLoaderHEIF::write(const guchar *buf, gsize &chunk_size, gsize count, GError **)
  67 {
  68         struct heif_context* ctx;
  69         struct heif_image* img;
  70         struct heif_error error_code;
  71         struct heif_image_handle* handle;
  72         guint8* pixels;
  73         gint width;
  74         gint height;
  75         gint stride;
  76         gboolean alpha;
  77
  78         ctx = heif_context_alloc();
  79
  80         error_code = heif_context_read_from_memory_without_copy(ctx, buf, count, nullptr);
  81         if (error_code.code)
  82                 {
  83                 log_printf("warning: heif reader error: %s\n", error_code.message);
  84                 heif_context_free(ctx);
  85                 return FALSE;
  86                 }
  87
  88         page_total = heif_context_get_number_of_top_level_images(ctx);
  89
  90         std::vector<heif_item_id> IDs(page_total);
  91
  92         /* get list of all (top level) image IDs */
  93         heif_context_get_list_of_top_level_image_IDs(ctx, IDs.data(), page_total);
  94
  95         error_code = heif_context_get_image_handle(ctx, IDs[page_num], &handle);
  96         if (error_code.code)
  97                 {
  98                 log_printf("warning: heif reader error: %s\n", error_code.message);
  99                 heif_context_free(ctx);
 100                 return FALSE;
 101                 }
 102
 103         // decode the image and convert colorspace to RGB, saved as 24bit interleaved
 104         error_code = heif_decode_image(handle, &img, heif_colorspace_RGB, heif_chroma_interleaved_24bit, nullptr);
 105         if (error_code.code)
 106                 {
 107                 log_printf("warning: heif reader error: %s\n", error_code.message);
 108                 heif_context_free(ctx);
 109                 return FALSE;
 110                 }
 111
 112         pixels = heif_image_get_plane(img, heif_channel_interleaved, &stride);
 113
 114         height = heif_image_get_height(img,heif_channel_interleaved);
 115         width = heif_image_get_width(img,heif_channel_interleaved);
 116         alpha = heif_image_handle_has_alpha_channel(handle);
 117         heif_image_handle_release(handle);
 118
 119         pixbuf = gdk_pixbuf_new_from_data(pixels, GDK_COLORSPACE_RGB, alpha, 8, width, height, stride, free_buffer, img);
 120
 121         area_updated_cb(nullptr, 0, 0, width, height, data);
 122
 123         heif_context_free(ctx);
 124
 125         chunk_size = count;
 126         return TRUE;
 127 }
 128
 129 void ImageLoaderHEIF::init(AreaUpdatedCb area_updated_cb, SizePreparedCb, AreaPreparedCb, gpointer data)
 130 {
 131         this->area_updated_cb = area_updated_cb;
 132         this->data = data;
 133         page_num = 0;
 134 }
 135
 136 GdkPixbuf *ImageLoaderHEIF::get_pixbuf()
 137 {
 138         return pixbuf;
 139 }
 140
 141 gchar *ImageLoaderHEIF::get_format_name()
 142 {
 143         return g_strdup("heif");
 144 }
 145
 146 gchar **ImageLoaderHEIF::get_format_mime_types()
 147 {
 148         static const gchar *mime[] = {"image/heic", nullptr};
 149         return g_strdupv(const_cast<gchar **>(mime));
 150 }
 151
 152 void ImageLoaderHEIF::set_page_num(gint page_num)
 153 {
 154         this->page_num = page_num;
 155 }
 156
 157 gint ImageLoaderHEIF::get_page_total()
 158 {
 159         return page_total;
 160 }
 161
 162 ImageLoaderHEIF::~ImageLoaderHEIF()
 163 {
 164         if (pixbuf) g_object_unref(pixbuf);
 165 }
 166
 167 } // namespace
 168
 169 std::unique_ptr<ImageLoaderBackend> get_image_loader_backend_heif()
 170 {
 171         return std::make_unique<ImageLoaderHEIF>();
 172 }
 173
 174 #endif
 175 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */