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