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