src/image-load-webp.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 <config.h>
  22
  23 #if HAVE_WEBP
  24 #include "image-load-webp.h"
  25
  26 #include <gdk-pixbuf/gdk-pixbuf.h>
  27 #include <glib-object.h>
  28 #include <glib.h>
  29 #include <webp/decode.h>
  30
  31 #include "debug.h"
  32 #include "image-load.h"
  33
  34 namespace
  35 {
  36
  37 using ImageLoaderWEBP = struct _ImageLoaderWEBP;
  38 struct _ImageLoaderWEBP {
  39         ImageLoaderBackendCbAreaUpdated area_updated_cb;
  40         ImageLoaderBackendCbSize size_cb;
  41         ImageLoaderBackendCbAreaPrepared area_prepared_cb;
  42         gpointer data;
  43         GdkPixbuf *pixbuf;
  44         guint requested_width;
  45         guint requested_height;
  46         gboolean abort;
  47 };
  48
  49 void free_buffer(guchar *pixels, gpointer)
  50 {
  51         g_free(pixels);
  52 }
  53
  54 gboolean image_loader_webp_write(gpointer loader, const guchar *buf, gsize &chunk_size, gsize count, GError **)
  55 {
  56         auto *ld = (ImageLoaderWEBP *) loader;
  57         guint8* data;
  58         gint width;
  59         gint height;
  60         gboolean res_info;
  61         WebPBitstreamFeatures features;
  62         VP8StatusCode status_code;
  63
  64         res_info = WebPGetInfo(buf, count, &width, &height);
  65         if (!res_info)
  66                 {
  67                 log_printf("warning: webp reader error\n");
  68                 return FALSE;
  69                 }
  70
  71         status_code = WebPGetFeatures(buf, count, &features);
  72         if (status_code != VP8_STATUS_OK)
  73                 {
  74                 log_printf("warning: webp reader error\n");
  75                 return FALSE;
  76                 }
  77
  78         if (features.has_alpha)
  79                 {
  80                 data = WebPDecodeRGBA(buf, count, &width, &height);
  81                 }
  82         else
  83                 {
  84                 data = WebPDecodeRGB(buf, count, &width, &height);
  85                 }
  86
  87         ld->pixbuf = gdk_pixbuf_new_from_data(data, GDK_COLORSPACE_RGB, features.has_alpha, 8, width, height, width * (features.has_alpha ? 4 : 3), free_buffer, nullptr);
  88
  89         ld->area_updated_cb(loader, 0, 0, width, height, ld->data);
  90
  91         chunk_size = count;
  92         return TRUE;
  93 }
  94
  95 gpointer image_loader_webp_new(ImageLoaderBackendCbAreaUpdated area_updated_cb, ImageLoaderBackendCbSize size_cb, ImageLoaderBackendCbAreaPrepared area_prepared_cb, gpointer data)
  96 {
  97         auto *loader = g_new0(ImageLoaderWEBP, 1);
  98         loader->area_updated_cb = area_updated_cb;
  99         loader->size_cb = size_cb;
 100         loader->area_prepared_cb = area_prepared_cb;
 101         loader->data = data;
 102
 103         return (gpointer) loader;
 104 }
 105
 106 void image_loader_webp_set_size(gpointer loader, int width, int height)
 107 {
 108         auto *ld = (ImageLoaderWEBP *) loader;
 109         ld->requested_width = width;
 110         ld->requested_height = height;
 111 }
 112
 113 GdkPixbuf* image_loader_webp_get_pixbuf(gpointer loader)
 114 {
 115         auto *ld = (ImageLoaderWEBP *) loader;
 116         return ld->pixbuf;
 117 }
 118
 119 gchar* image_loader_webp_get_format_name(gpointer)
 120 {
 121         return g_strdup("webp");
 122 }
 123
 124 gchar** image_loader_webp_get_format_mime_types(gpointer)
 125 {
 126         static const gchar *mime[] = {"image/webp", nullptr};
 127         return g_strdupv(const_cast<gchar **>(mime));
 128 }
 129
 130 gboolean image_loader_webp_close(gpointer, GError **)
 131 {
 132         return TRUE;
 133 }
 134
 135 void image_loader_webp_abort(gpointer loader)
 136 {
 137         auto *ld = (ImageLoaderWEBP *) loader;
 138         ld->abort = TRUE;
 139 }
 140
 141 void image_loader_webp_free(gpointer loader)
 142 {
 143         auto *ld = (ImageLoaderWEBP *) loader;
 144         if (ld->pixbuf) g_object_unref(ld->pixbuf);
 145         g_free(ld);
 146 }
 147
 148 } // namespace
 149
 150 void image_loader_backend_set_webp(ImageLoaderBackend *funcs)
 151 {
 152 DEBUG_0("        "     );
 153         funcs->loader_new = image_loader_webp_new;
 154         funcs->set_size = image_loader_webp_set_size;
 155         funcs->write = image_loader_webp_write;
 156         funcs->get_pixbuf = image_loader_webp_get_pixbuf;
 157         funcs->close = image_loader_webp_close;
 158         funcs->abort = image_loader_webp_abort;
 159         funcs->free = image_loader_webp_free;
 160         funcs->get_format_name = image_loader_webp_get_format_name;
 161         funcs->get_format_mime_types = image_loader_webp_get_format_mime_types;
 162 }
 163
 164 #endif
 165 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */