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 <vector>
  24
  25 #include <gdk-pixbuf/gdk-pixbuf.h>
  26 #include <glib-object.h>
  27 #include <glib.h>
  28 #include <libheif/heif.h>
  29
  30 #include "debug.h"
  31 #include "image-load.h"
  32
  33 namespace
  34 {
  35
  36 struct ImageLoaderHEIF : public ImageLoaderBackend
  37 {
  38 public:
  39         ~ImageLoaderHEIF() 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 void free_buffer(guchar *, gpointer data)
  59 {
  60         heif_image_release(static_cast<const struct heif_image*>(data));
  61 }
  62
  63 gboolean ImageLoaderHEIF::write(const guchar *buf, gsize &chunk_size, gsize count, GError **)
  64 {
  65         struct heif_context* ctx;
  66         struct heif_image* img;
  67         struct heif_error error_code;
  68         struct heif_image_handle* handle;
  69         guint8* pixels;
  70         gint width;
  71         gint height;
  72         gint stride;
  73         gboolean alpha;
  74
  75         ctx = heif_context_alloc();
  76
  77         error_code = heif_context_read_from_memory_without_copy(ctx, buf, count, nullptr);
  78         if (error_code.code)
  79                 {
  80                 log_printf("warning: heif reader error: %s\n", error_code.message);
  81                 heif_context_free(ctx);
  82                 return FALSE;
  83                 }
  84
  85         page_total = heif_context_get_number_of_top_level_images(ctx);
  86
  87         std::vector<heif_item_id> IDs(page_total);
  88
  89         /* get list of all (top level) image IDs */
  90         heif_context_get_list_of_top_level_image_IDs(ctx, IDs.data(), page_total);
  91
  92         error_code = heif_context_get_image_handle(ctx, IDs[page_num], &handle);
  93         if (error_code.code)
  94                 {
  95                 log_printf("warning: heif reader error: %s\n", error_code.message);
  96                 heif_context_free(ctx);
  97                 return FALSE;
  98                 }
  99
 100         // decode the image and convert colorspace to RGB, saved as 24bit interleaved
 101         error_code = heif_decode_image(handle, &img, heif_colorspace_RGB, heif_chroma_interleaved_24bit, nullptr);
 102         if (error_code.code)
 103                 {
 104                 log_printf("warning: heif reader error: %s\n", error_code.message);
 105                 heif_context_free(ctx);
 106                 return FALSE;
 107                 }
 108
 109         pixels = heif_image_get_plane(img, heif_channel_interleaved, &stride);
 110
 111         height = heif_image_get_height(img,heif_channel_interleaved);
 112         width = heif_image_get_width(img,heif_channel_interleaved);
 113         alpha = heif_image_handle_has_alpha_channel(handle);
 114         heif_image_handle_release(handle);
 115
 116         pixbuf = gdk_pixbuf_new_from_data(pixels, GDK_COLORSPACE_RGB, alpha, 8, width, height, stride, free_buffer, img);
 117
 118         area_updated_cb(nullptr, 0, 0, width, height, data);
 119
 120         heif_context_free(ctx);
 121
 122         chunk_size = count;
 123         return TRUE;
 124 }
 125
 126 void ImageLoaderHEIF::init(AreaUpdatedCb area_updated_cb, SizePreparedCb, AreaPreparedCb, gpointer data)
 127 {
 128         this->area_updated_cb = area_updated_cb;
 129         this->data = data;
 130         page_num = 0;
 131 }
 132
 133 GdkPixbuf *ImageLoaderHEIF::get_pixbuf()
 134 {
 135         return pixbuf;
 136 }
 137
 138 gchar *ImageLoaderHEIF::get_format_name()
 139 {
 140         return g_strdup("heif");
 141 }
 142
 143 gchar **ImageLoaderHEIF::get_format_mime_types()
 144 {
 145         static const gchar *mime[] = {"image/heic", nullptr};
 146         return g_strdupv(const_cast<gchar **>(mime));
 147 }
 148
 149 void ImageLoaderHEIF::set_page_num(gint page_num)
 150 {
 151         this->page_num = page_num;
 152 }
 153
 154 gint ImageLoaderHEIF::get_page_total()
 155 {
 156         return page_total;
 157 }
 158
 159 ImageLoaderHEIF::~ImageLoaderHEIF()
 160 {
 161         if (pixbuf) g_object_unref(pixbuf);
 162 }
 163
 164 } // namespace
 165
 166 std::unique_ptr<ImageLoaderBackend> get_image_loader_backend_heif()
 167 {
 168         return std::make_unique<ImageLoaderHEIF>();
 169 }
 170
 171 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */