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 "main.h"
  22
  23 #include "image-load.h"
  24 #include "image-load-heif.h"
  25 #include <vector>
  26 #ifdef HAVE_HEIF
  27 #include <libheif/heif.h>
  28
  29 struct ImageLoaderHEIF {
  30         ImageLoaderBackendCbAreaUpdated area_updated_cb;
  31         ImageLoaderBackendCbSize size_cb;
  32         ImageLoaderBackendCbAreaPrepared area_prepared_cb;
  33         gpointer data;
  34         GdkPixbuf *pixbuf;
  35         guint requested_width;
  36         guint requested_height;
  37         gboolean abort;
  38         gint page_num;
  39         gint page_total;
  40 };
  41
  42 static void free_buffer(guchar *, gpointer data)
  43 {
  44         heif_image_release(static_cast<const struct heif_image*>(data));
  45 }
  46
  47 static gboolean image_loader_heif_load(gpointer loader, const guchar *buf, gsize count, GError **)
  48 {
  49         auto ld = static_cast<ImageLoaderHEIF *>(loader);
  50         struct heif_context* ctx;
  51         struct heif_image* img;
  52         struct heif_error error_code;
  53         struct heif_image_handle* handle;
  54         guint8* data;
  55         gint width;
  56         gint height;
  57         gint stride;
  58         gboolean alpha;
  59         gint page_total;
  60
  61         ctx = heif_context_alloc();
  62
  63         error_code = heif_context_read_from_memory_without_copy(ctx, buf, count, nullptr);
  64         if (error_code.code)
  65                 {
  66                 log_printf("warning: heif reader error: %s\n", error_code.message);
  67                 heif_context_free(ctx);
  68                 return FALSE;
  69                 }
  70
  71         page_total = heif_context_get_number_of_top_level_images(ctx);
  72         ld->page_total = page_total;
  73
  74         std::vector<heif_item_id> IDs(page_total);
  75
  76         /* get list of all (top level) image IDs */
  77         heif_context_get_list_of_top_level_image_IDs(ctx, IDs.data(), page_total);
  78
  79         error_code = heif_context_get_image_handle(ctx, IDs[ld->page_num], &handle);
  80         if (error_code.code)
  81                 {
  82                 log_printf("warning:  heif reader error: %s\n", error_code.message);
  83                 heif_context_free(ctx);
  84                 return FALSE;
  85                 }
  86
  87         // decode the image and convert colorspace to RGB, saved as 24bit interleaved
  88         error_code = heif_decode_image(handle, &img, heif_colorspace_RGB, heif_chroma_interleaved_24bit, nullptr);
  89         if (error_code.code)
  90                 {
  91                 log_printf("warning: heif reader error: %s\n", error_code.message);
  92                 heif_context_free(ctx);
  93                 return FALSE;
  94                 }
  95
  96         data = heif_image_get_plane(img, heif_channel_interleaved, &stride);
  97
  98         height = heif_image_get_height(img,heif_channel_interleaved);
  99         width = heif_image_get_width(img,heif_channel_interleaved);
 100         alpha = heif_image_handle_has_alpha_channel(handle);
 101         heif_image_handle_release(handle);
 102
 103         ld->pixbuf = gdk_pixbuf_new_from_data(data, GDK_COLORSPACE_RGB, alpha, 8, width, height, stride, free_buffer, img);
 104
 105         ld->area_updated_cb(loader, 0, 0, width, height, ld->data);
 106
 107         heif_context_free(ctx);
 108
 109         return TRUE;
 110 }
 111
 112 static gpointer image_loader_heif_new(ImageLoaderBackendCbAreaUpdated area_updated_cb, ImageLoaderBackendCbSize size_cb, ImageLoaderBackendCbAreaPrepared area_prepared_cb, gpointer data)
 113 {
 114         auto loader = g_new0(ImageLoaderHEIF, 1);
 115         loader->area_updated_cb = area_updated_cb;
 116         loader->size_cb = size_cb;
 117         loader->area_prepared_cb = area_prepared_cb;
 118         loader->data = data;
 119         loader->page_num = 0;
 120         return loader;
 121 }
 122
 123 static void image_loader_heif_set_size(gpointer loader, int width, int height)
 124 {
 125         auto ld = static_cast<ImageLoaderHEIF *>(loader);
 126         ld->requested_width = width;
 127         ld->requested_height = height;
 128 }
 129
 130 static GdkPixbuf* image_loader_heif_get_pixbuf(gpointer loader)
 131 {
 132         auto ld = static_cast<ImageLoaderHEIF *>(loader);
 133         return ld->pixbuf;
 134 }
 135
 136 static gchar* image_loader_heif_get_format_name(gpointer)
 137 {
 138         return g_strdup("heif");
 139 }
 140
 141 static gchar** image_loader_heif_get_format_mime_types(gpointer)
 142 {
 143         static const gchar *mime[] = {"image/heic", nullptr};
 144         return g_strdupv(const_cast<gchar **>(mime));
 145 }
 146
 147 static void image_loader_heif_set_page_num(gpointer loader, gint page_num)
 148 {
 149         auto ld = static_cast<ImageLoaderHEIF *>(loader);
 150
 151         ld->page_num = page_num;
 152 }
 153
 154 static gint image_loader_heif_get_page_total(gpointer loader)
 155 {
 156         auto ld = static_cast<ImageLoaderHEIF *>(loader);
 157
 158         return ld->page_total;
 159 }
 160
 161 static gboolean image_loader_heif_close(gpointer, GError **)
 162 {
 163         return TRUE;
 164 }
 165
 166 static void image_loader_heif_abort(gpointer loader)
 167 {
 168         auto ld = static_cast<ImageLoaderHEIF *>(loader);
 169         ld->abort = TRUE;
 170 }
 171
 172 static void image_loader_heif_free(gpointer loader)
 173 {
 174         auto ld = static_cast<ImageLoaderHEIF *>(loader);
 175         if (ld->pixbuf) g_object_unref(ld->pixbuf);
 176         g_free(ld);
 177 }
 178
 179 void image_loader_backend_set_heif(ImageLoaderBackend *funcs)
 180 {
 181         funcs->loader_new = image_loader_heif_new;
 182         funcs->set_size = image_loader_heif_set_size;
 183         funcs->load = image_loader_heif_load;
 184         funcs->write = nullptr;
 185         funcs->get_pixbuf = image_loader_heif_get_pixbuf;
 186         funcs->close = image_loader_heif_close;
 187         funcs->abort = image_loader_heif_abort;
 188         funcs->free = image_loader_heif_free;
 189         funcs->get_format_name = image_loader_heif_get_format_name;
 190         funcs->get_format_mime_types = image_loader_heif_get_format_mime_types;
 191         funcs->set_page_num = image_loader_heif_set_page_num;
 192         funcs->get_page_total = image_loader_heif_get_page_total;
 193 }
 194
 195 #endif
 196 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */