public static async Task <IMatrixProject> LoadFromImageAsync(this StorageFile file, uint maximumHeight, uint maximumWidth)
{
IMatrixProject returnValue = new MatrixProject()
{
ColorMatrix = new ColorMatrix(maximumWidth, maximumHeight)
};
using (Stream imageStream = await file.OpenStreamForReadAsync())
{
BitmapDecoder decoder = await BitmapDecoder.CreateAsync(imageStream.AsRandomAccessStream());
// ***
// *** Get the pixel mapper.
// ***
IPixelMapperFactory factory = new PixelMapperFactory();
IPixelMapper mapper = await factory.GetMapper(decoder.BitmapPixelFormat);
PixelDataProvider data = await decoder.GetPixelDataAsync();
byte[] bytes = data.DetachPixelData();
uint width = decoder.OrientedPixelWidth;
uint height = decoder.OrientedPixelHeight;
if (width > maximumWidth || height > maximumHeight)
{
(bytes, width, height) = await decoder.ResizeImageAsync(maximumHeight, maximumWidth);
}
if (width <= maximumWidth && height <= maximumHeight)
{
uint startColumn = (uint)((maximumWidth - width) / 2.0);
uint startRow = (uint)((maximumHeight - height) / 2.0);
for (uint row = 0; row < height; row++)
{
for (uint column = 0; column < width; column++)
{
// ***
// *** Get the color from the image data.
// ***
Color color = await mapper.GetPixelAsync(bytes, row, column, width, height);
// ***
// *** The default color item type is pixel.
// ***
ColorItem.ColorItemType itemType = ColorItem.ColorItemType.Pixel;
if (color.A == 0 && (color.R != 0 || color.G != 0 || color.B != 0))
{
// ***
// *** An item with color and an alpha of 0 is a
// *** sand pixel.
// ***
itemType = ColorItem.ColorItemType.Sand;
color.A = 255;
}
else if (color.A == 0)
{
// ***
// *** An item without color (black) and an alpha
// *** of 0 is a sand pixel.
// ***
itemType = ColorItem.ColorItemType.Background;
}
await returnValue.ColorMatrix.SetItem(row + startRow, column + startColumn, color, itemType);
}
}
// ***
// *** Read the meta data.
// ***
await returnValue.RestoreImageMetaData(file);
}
else
{
throw new BadImageFormatException();
}
}
return(returnValue);
}
