Esempio n. 1
0
        public async Task <ImageSource> SaveToImageSource(SpiderImage spiderImage)
        {
            ImageSource imageSource = null;

            using (MemoryStream stream = new MemoryStream(spiderImage.Content))
            {
                var ras         = stream.AsRandomAccessStream();
                var decoderGuid = BitmapDecoder.JpegDecoderId;
                switch (spiderImage.ImageType.ToLower())
                {
                case "image/png": { decoderGuid = BitmapDecoder.PngDecoderId; break; }

                case "image/webp": { decoderGuid = BitmapDecoder.WebpDecoderId; break; }

                case "image/gif": { decoderGuid = BitmapDecoder.GifDecoderId; break; }
                }
                BitmapDecoder decoder = await BitmapDecoder.CreateAsync(decoderGuid, ras);

                var provider = await decoder.GetPixelDataAsync();

                byte[]          buffer = provider.DetachPixelData();
                WriteableBitmap bitmap = new WriteableBitmap((int)decoder.PixelWidth, (int)decoder.PixelHeight);
                await bitmap.PixelBuffer.AsStream().WriteAsync(buffer, 0, buffer.Length);

                imageSource = bitmap;
            }
            return(imageSource);
        }
Esempio n. 2
0
        private async Task LoadImage()
        {
            if (imgScrollViewer.VerticalScrollBarVisibility != ScrollBarVisibility.Disabled)
            {
                imgScrollViewer.VerticalScrollBarVisibility = ScrollBarVisibility.Disabled;
            }
            if (img.RenderTransform is ScaleTransform)
            {
                var transform = img.RenderTransform as ScaleTransform; transform.ScaleX = 1; transform.ScaleY = 1;
            }

            CurrentImage = ImageCollection.AsQueryable().Skip(skip).Take(take).FirstOrDefault();
            if (CurrentImage == null)
            {
                skip -= 1; return;
            }
            await this.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.High, async() =>
            {
                img.Source = await SaveToImageSource(CurrentImage);
            });
        }