public async Task <ImageCanvasDataService> OpenImageDialog()
{
var picker = new FileOpenPicker
{
ViewMode = PickerViewMode.Thumbnail,
SuggestedStartLocation = PickerLocationId.PicturesLibrary
};
picker.FileTypeFilter.Add(".jpg");
picker.FileTypeFilter.Add(".png");
var file = await picker.PickSingleFileAsync();
ImageCanvasDataService result = null;
if (file != null)
{
result = await ImageWriterService.StorageFileToCanvasData(file);
}
return(result);
}
public void Resize(ref ImageCanvasDataService imageHolst)
{
int width = imageHolst.Width;
int height = imageHolst.Height;
var softwareBitmap = new SoftwareBitmap(BitmapPixelFormat.Bgra8,
imageHolst.Image.PixelWidth,
imageHolst.Image.PixelHeight);
imageHolst.Image.CopyTo(softwareBitmap);
byte[] imageBytes = new byte[softwareBitmap.PixelHeight * softwareBitmap.PixelWidth * 4];
softwareBitmap.CopyToBuffer(imageBytes.AsBuffer());
var resourceCreator = CanvasDevice.GetSharedDevice();
var canvasBitmap = CanvasBitmap.CreateFromBytes(
resourceCreator,
imageBytes,
softwareBitmap.PixelWidth,
softwareBitmap.PixelHeight,
Windows.Graphics.DirectX.DirectXPixelFormat.B8G8R8A8UIntNormalized,
96.0f);
var canvasRenderTarget = new CanvasRenderTarget(resourceCreator, width, height, 96);
using (var cds = canvasRenderTarget.CreateDrawingSession())
{
cds.DrawImage(canvasBitmap, canvasRenderTarget.Bounds);
}
var pixelBytes = canvasRenderTarget.GetPixelBytes();
imageHolst.ImageSRC.DecodePixelHeight = height;
imageHolst.ImageSRC.DecodePixelWidth = width;
var scaledSoftwareBitmap = new SoftwareBitmap(BitmapPixelFormat.Bgra8, width, height);
scaledSoftwareBitmap.CopyFromBuffer(pixelBytes.AsBuffer());
imageHolst.Image = scaledSoftwareBitmap;
}
