/// <summary>
/// Gets the color of the pixel at the x, y coordinate as a Color struct.
/// </summary>
/// <param name="bmp">The WriteableBitmap.</param>
/// <param name="x">The x coordinate of the pixel.</param>
/// <param name="y">The y coordinate of the pixel.</param>
/// <returns>The color of the pixel at x, y as a Color struct.</returns>
public Color GetPixel(int x, int y)
{
int c = GetPixels()[y * _width + x];
byte a = (byte)(c >> 24);
//float ai = a / PreMultiplyFactor;
float ai = 1;
return(Color.FromArgb(a, (byte)((c >> 16) * ai), (byte)((c >> 8) * ai), (byte)(c * ai)));
}
/// <summary>
/// Fills the whole WriteableBitmap with a color.
/// </summary>
/// <param name="bmp">The WriteableBitmap.</param>
/// <param name="color">The color used for filling.</param>
public void Clear(Color color)
{
float ai = color.A * PreMultiplyFactor;
int col = (color.A << 24) | ((byte)(color.R * ai) << 16) | ((byte)(color.G * ai) << 8) | (byte)(color.B * ai);
int[] pixels = GetPixels();
int w = _inner.PixelWidth;
int h = _inner.PixelHeight;
int len = w * SizeOfARGB;
// Fill first line
for (int x = 0; x < w; x++)
{
pixels[x] = col;
}
// Copy first line
for (int y = 1; y < h; y++)
{
Buffer.BlockCopy(pixels, 0, pixels, y * len, len);
}
}
/// <summary>
/// Fills the whole WriteableBitmap with a color.
/// </summary>
/// <param name="bmp">The WriteableBitmap.</param>
/// <param name="color">The color used for filling.</param>
public void Clear(Color color)
{
float ai = color.A * PreMultiplyFactor;
int col = (color.A << 24) | ((byte)(color.R * ai) << 16) | ((byte)(color.G * ai) << 8) | (byte)(color.B * ai);
int[] pixels = GetPixels();
int w = _inner.PixelWidth;
int h = _inner.PixelHeight;
int len = w * SizeOfARGB;
// Fill first line
for (int x = 0; x < w; x++)
{
pixels[x] = col;
}
// Copy first line
for (int y = 1; y < h; y++)
{
Buffer.BlockCopy(pixels, 0, pixels, y * len, len);
}
}
/// <summary>
/// Sets the color of the pixel.
/// </summary>
/// <param name="x">The x coordinate (row).</param>
/// <param name="y">The y coordinate (column).</param>
/// <param name="color">The color.</param>
public void SetPixel(int x, int y, Color color)
{
float ai = color.A * PreMultiplyFactor;
GetPixels()[y * _width + x] = (color.A << 24) | ((byte)(color.R * ai) << 16) | ((byte)(color.G * ai) << 8) | (byte)(color.B * ai);
}
/// <summary>
/// Sets the color of the pixel.
/// </summary>
/// <param name="x">The x coordinate (row).</param>
/// <param name="y">The y coordinate (column).</param>
/// <param name="color">The color.</param>
public void SetPixel(int x, int y, Color color)
{
float ai = color.A * PreMultiplyFactor;
GetPixels()[y * _width + x] = (color.A << 24) | ((byte)(color.R * ai) << 16) | ((byte)(color.G * ai) << 8) | (byte)(color.B * ai);
}
