public override ImageData Read(IBinaryStream stream, ImageMetaData info)
{
var reader = new WebPDecoder(stream, (WebPMetaData)info);
reader.Decode();
return(ImageData.Create(info, reader.Format, null, reader.Output));
}
public async Task <WriteableBitmap> GetImageFromUrl(string url)
{
var bytes = new HttpClient().GetByteArrayAsync(url).Result;
// Create an instance of the decoder
var webp = new WebPDecoder();
// Decode to BGRA (Bitmaps use this format)
var pixelData1 = await webp.DecodeBgraAsync(bytes);
var pixelData = pixelData1.ToArray();
// Get the size
var size = await webp.GetSizeAsync(bytes);
// With the size of the webp, create a WriteableBitmap
var bitmap = new WriteableBitmap((int)size.Width, (int)size.Height);
// Write the pixel data to the buffer
var stream = bitmap.PixelBuffer.AsStream();
await stream.WriteAsync(pixelData, 0, pixelData.Length);
return(bitmap);
}
private static async void SourceCallback(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
try
{
var image = d as Image;
var imageBrush = d as ImageBrush;
if (imageBrush == null && image == null) return;
if (image != null) image.Source = null;
else imageBrush.ImageSource = null;
var url = (Uri) e.NewValue;
if (url == null)
{
return;
}
if (!url.OriginalString.Contains(".webp"))
{
if (image != null) image.Source = new BitmapImage(url);
else imageBrush.ImageSource = new BitmapImage(url);
return;
}
if (url.OriginalString.StartsWith("ms-resource"))
url = new Uri(url.OriginalString.Replace("ms-resource:///Files/", "ms-appx:///"));
var streamReference = RandomAccessStreamReference.CreateFromUri(url);
ImageSource source;
byte[] arr;
using (var stream = (await streamReference.OpenReadAsync()).AsStreamForRead())
{
arr = new byte[stream.Length];
await stream.ReadAsync(arr, 0, arr.Length);
}
try
{
var webp = new WebPDecoder();
var size = await webp.GetSizeAsync(arr);
var pixelData = await webp.DecodeBgraAsync(arr);
var wb = new WriteableBitmap((int) size.Width, (int) size.Height);
var pixelArr = pixelData.ToArray();
using (var pixelDataStream = wb.PixelBuffer.AsStream())
{
await pixelDataStream.WriteAsync(pixelArr, 0, pixelArr.Length);
source = wb;
}
}
catch
{
using (var rnd = new MemoryStream(arr).AsRandomAccessStream())
{
var bitmap = new BitmapImage();
await bitmap.SetSourceAsync(rnd);
source = bitmap;
}
}
if (image != null) image.Source = source;
else imageBrush.ImageSource = source;
}
catch (Exception ex)
{
Debug.WriteLine("Something happened opening webp image. Stack trace: " + ex.Message);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="T:WebP.Touch.WebPCodec"/> class.
/// </summary>
public WebPCodec()
{
_decoder = new WebPDecoder();
}
private static async void SourceCallback(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
try
{
var image = d as Image;
var imageBrush = d as ImageBrush;
if (imageBrush == null && image == null)
{
return;
}
if (image != null)
{
image.Source = null;
}
else
{
imageBrush.ImageSource = null;
}
var url = (Uri)e.NewValue;
if (url == null)
{
return;
}
if (!url.OriginalString.Contains(".webp"))
{
if (image != null)
{
image.Source = new BitmapImage(url);
}
else
{
imageBrush.ImageSource = new BitmapImage(url);
}
return;
}
if (url.OriginalString.StartsWith("ms-resource"))
{
url = new Uri(url.OriginalString.Replace("ms-resource:///Files/", "ms-appx:///"));
}
var streamReference = RandomAccessStreamReference.CreateFromUri(url);
ImageSource source;
byte[] arr;
using (var stream = (await streamReference.OpenReadAsync()).AsStreamForRead())
{
arr = new byte[stream.Length];
await stream.ReadAsync(arr, 0, arr.Length);
}
try
{
var webp = new WebPDecoder();
var size = await webp.GetSizeAsync(arr);
var pixelData = await webp.DecodeBgraAsync(arr);
var wb = new WriteableBitmap((int)size.Width, (int)size.Height);
var pixelArr = pixelData.ToArray();
using (var pixelDataStream = wb.PixelBuffer.AsStream())
{
await pixelDataStream.WriteAsync(pixelArr, 0, pixelArr.Length);
source = wb;
}
}
catch
{
using (var rnd = new MemoryStream(arr).AsRandomAccessStream())
{
var bitmap = new BitmapImage();
await bitmap.SetSourceAsync(rnd);
source = bitmap;
}
}
if (image != null)
{
image.Source = source;
}
else
{
imageBrush.ImageSource = source;
}
}
catch (Exception ex)
{
Debug.WriteLine("Something happened opening webp image. Stack trace: " + ex.Message);
}
}
private static ImageSource DecodeWebPImage(string cacheKey, byte[] buffer, System.Action faultCallback = null)
{
try
{
WeakReference <WriteableBitmap> reference;
if (_cachedWebPImages.TryGetValue(cacheKey, out reference))
{
WriteableBitmap cachedBitmap;
if (reference.TryGetTarget(out cachedBitmap))
{
return(cachedBitmap);
}
}
var decoder = new WebPDecoder();
int width = 0, height = 0;
byte[] decoded = null;
try
{
decoded = decoder.DecodeRgbA(buffer, out width, out height);
}
catch (Exception ex)
{
faultCallback.SafeInvoke();
// не получается сконвертировать, битый файл
//store.DeleteFile(documentLocalFileName);
Telegram.Api.Helpers.Execute.ShowDebugMessage("WebPDecoder.DecodeRgbA ex " + ex);
}
if (decoded == null)
{
return(null);
}
var wb = new WriteableBitmap(width, height);
for (var i = 0; i < decoded.Length / 4; i++)
{
int r = decoded[4 * i];
int g = decoded[4 * i + 1];
int b = decoded[4 * i + 2];
int a = decoded[4 * i + 3];
a <<= 24;
r <<= 16;
g <<= 8;
int iPixel = a | r | g | b;
wb.Pixels[i] = iPixel;
}
_cachedWebPImages[cacheKey] = new WeakReference <WriteableBitmap>(wb);
return(wb);
}
catch (Exception ex)
{
TLUtils.WriteException("WebPDecode ex ", ex);
}
return(null);
}
public async Task<WriteableBitmap> GetImageFromUrl(string url)
{
var bytes = new HttpClient().GetByteArrayAsync(url).Result;
// Create an instance of the decoder
var webp = new WebPDecoder();
// Decode to BGRA (Bitmaps use this format)
var pixelData1 = await webp.DecodeBgraAsync(bytes);
var pixelData = pixelData1.ToArray();
// Get the size
var size = await webp.GetSizeAsync(bytes);
// With the size of the webp, create a WriteableBitmap
var bitmap = new WriteableBitmap((int)size.Width, (int)size.Height);
// Write the pixel data to the buffer
var stream = bitmap.PixelBuffer.AsStream();
await stream.WriteAsync(pixelData, 0, pixelData.Length);
return bitmap;
}
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