private async void ScaleRainbowButton_Click(object sender, RoutedEventArgs e)
{
SoftwareBitmap tempSB;
double scale = DisplayInformation.GetForCurrentView().RawPixelsPerViewPixel;
int renderTB_Width = 200;
int renderTB_Height = 100;
int newWidth = g704_softwareBitmap.PixelWidth;
int newHeight = g704_softwareBitmap.PixelHeight;
// Step 1 :
// Create RenderTargetBitmap by ColorRectangle.
// Don't worry about both width and height of ColorRectangle.
RenderTargetBitmap renderTargetBitmap = new RenderTargetBitmap();
ColorRectangle.Fill = MyColorHelper.GetRainbowBrush();
await renderTargetBitmap.RenderAsync(ColorRectangle, renderTB_Width, renderTB_Height);
// Step 2 :
// Get IBuffer from RenderTargetBitmap,
IBuffer ib = await renderTargetBitmap.GetPixelsAsync();
// Step 3 :
// Create a temporary SoftwareBitmap which is based on current scale
tempSB = SoftwareBitmap.CreateCopyFromBuffer(ib, BitmapPixelFormat.Bgra8,
(int)(renderTB_Width * scale), (int)(renderTB_Height * scale));
tempSB = SoftwareBitmap.Convert(tempSB, BitmapPixelFormat.Bgra8, BitmapAlphaMode.Premultiplied);
// Step 4 :
// Adjust to the same size as g704 image
tempSB = Resize(tempSB, newWidth, newHeight);
// Step 5 :
// Assign this temp image pixels to g704 image
g704_softwareBitmap = SoftwareBitmap.Convert(g704_softwareBitmap, BitmapPixelFormat.Bgra8, BitmapAlphaMode.Straight);
AssignPixelValues(g704_softwareBitmap, tempSB);
g704_softwareBitmap = SoftwareBitmap.Convert(g704_softwareBitmap, BitmapPixelFormat.Bgra8, BitmapAlphaMode.Premultiplied);
var source = new SoftwareBitmapSource();
await source.SetBitmapAsync(g704_softwareBitmap);
G704.Source = source;
}
private async void RainbowButton_Click(object sender, RoutedEventArgs e)
{
int width = g704_softwareBitmap.PixelWidth;
int height = g704_softwareBitmap.PixelHeight;
RenderTargetBitmap renderTargetBitmap = new RenderTargetBitmap();
ColorRectangle.Fill = MyColorHelper.GetRainbowBrush();
await renderTargetBitmap.RenderAsync(ColorRectangle, width, height);
g704_softwareBitmap = SoftwareBitmap.Convert(g704_softwareBitmap, BitmapPixelFormat.Bgra8, BitmapAlphaMode.Straight);
IBuffer ib = await renderTargetBitmap.GetPixelsAsync();
byte[] pixel_array = ib.ToArray();
ApplyRainbow(g704_softwareBitmap, pixel_array);
g704_softwareBitmap = SoftwareBitmap.Convert(g704_softwareBitmap, BitmapPixelFormat.Bgra8, BitmapAlphaMode.Premultiplied);
var source = new SoftwareBitmapSource();
await source.SetBitmapAsync(g704_softwareBitmap);
G704.Source = source;
}