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