/// <summary>
/// Clears an image.
/// </summary>
/// <param name="image">Image to clear</param>
/// <param name="clr">Color to clear to</param>
public static void Clear(this Image image, Color clr)
{
unsafe
{
int srcBytesPerPixel = PixelFormatHelper.GetBytesPerPixel(image.PixelFormat);
byte *srcRow = (byte *)image.ImageData.ToPointer();
for (int i = 0; i < image.Height; i++)
{
byte *srcCol = srcRow;
for (int j = 0; j < image.Width; j++)
{
switch (image.PixelFormat)
{
case PixelFormat.Gray_8bpp:
srcCol[0] = Image.Rgb2Gray(clr.R, clr.G, clr.B);
break;
case PixelFormat.Gray_16bpp:
((ushort *)srcCol)[0] = Image.Rgb2Gray((ushort)clr.R, (ushort)clr.G, (ushort)clr.B);
break;
case PixelFormat.BGR_24bpp:
srcCol[2] = clr.R;
srcCol[1] = clr.G;
srcCol[0] = clr.B;
break;
case PixelFormat.BGRX_32bpp:
srcCol[2] = clr.R;
srcCol[1] = clr.G;
srcCol[0] = clr.B;
break;
case PixelFormat.BGRA_32bpp:
srcCol[3] = clr.R;
srcCol[2] = clr.G;
srcCol[1] = clr.B;
srcCol[0] = clr.A;
break;
}
srcCol += srcBytesPerPixel;
}
srcRow += image.Stride;
}
}
}
/// <summary>
/// Copies a source image into a destination image using the specified masking image.
/// Only pixels in the source image whose corresponding mask image pixels are > 0
/// are copied to the destination image. Only pixels from the srcRect are copied
/// to the destination rect.
/// </summary>
/// <param name="srcImage">Source image</param>
/// <param name="srcRect">Source rectangle to copy from</param>
/// <param name="dstImage">Destination image</param>
/// <param name="dstRect">Destination rectangle to copy to</param>
/// <param name="maskImage">Masking image</param>
public static void CopyTo(this Image srcImage, Rectangle srcRect, Image dstImage, Rectangle dstRect, Image maskImage)
{
if (srcRect.Width != dstRect.Width || srcRect.Height != dstRect.Height)
{
throw new System.Exception("Source and destination rectangles sizes must match");
}
if (maskImage != null)
{
if (srcImage.Width != maskImage.Width || srcImage.Height != maskImage.Height)
{
throw new System.Exception("Mask image size must match source image size");
}
if (maskImage.PixelFormat != PixelFormat.Gray_8bpp)
{
throw new System.Exception("Mask image must be of type PixelFormat.Gray_8bpp");
}
}
PixelFormat srcFormat = srcImage.PixelFormat;
PixelFormat dstFormat = dstImage.PixelFormat;
System.IntPtr srcBuffer = srcImage.ImageData;
System.IntPtr dstBuffer = dstImage.ImageData;
System.IntPtr maskBuffer = (maskImage != null) ? maskImage.ImageData : System.IntPtr.Zero;
unsafe
{
int srcBytesPerPixel = PixelFormatHelper.GetBytesPerPixel(srcFormat);
int dstBytesPerPixel = PixelFormatHelper.GetBytesPerPixel(dstFormat);
int maskBytesPerPixel = PixelFormatHelper.GetBytesPerPixel(PixelFormat.Gray_8bpp);
byte *srcRow = (byte *)srcBuffer.ToPointer() + (srcRect.Y * srcImage.Stride) + (srcRect.X * srcBytesPerPixel);
byte *dstRow = (byte *)dstBuffer.ToPointer() + (dstRect.Y * dstImage.Stride) + (dstRect.X * dstBytesPerPixel);
byte *maskRow = null;
if (maskImage != null)
{
maskRow = (byte *)maskBuffer.ToPointer() + (srcRect.Y * maskImage.Stride) + (srcRect.X * maskBytesPerPixel);
}
for (int i = 0; i < srcRect.Height; i++)
{
byte *srcCol = srcRow;
byte *dstCol = dstRow;
byte *maskCol = maskRow;
for (int j = 0; j < srcRect.Width; j++)
{
bool copyPixel = true;
if (maskImage != null)
{
if (*maskCol == 0)
{
copyPixel = false;
}
}
if (copyPixel)
{
int red = 0;
int green = 0;
int blue = 0;
int alpha = 255;
switch (srcFormat)
{
case PixelFormat.Gray_8bpp:
red = green = blue = srcCol[0];
break;
case PixelFormat.Gray_16bpp:
red = green = blue = ((ushort *)srcCol)[0];
break;
case PixelFormat.BGR_24bpp:
blue = srcCol[0];
green = srcCol[1];
red = srcCol[2];
break;
case PixelFormat.BGRX_32bpp:
blue = srcCol[0];
green = srcCol[1];
red = srcCol[2];
break;
case PixelFormat.BGRA_32bpp:
blue = srcCol[0];
green = srcCol[1];
red = srcCol[2];
alpha = srcCol[3];
break;
case PixelFormat.RGBA_64bpp:
red = ((ushort *)srcCol)[0];
green = ((ushort *)srcCol)[1];
blue = ((ushort *)srcCol)[2];
alpha = ((ushort *)srcCol)[3];
break;
}
switch (dstFormat)
{
case PixelFormat.Gray_8bpp:
dstCol[0] = Image.Rgb2Gray((byte)red, (byte)green, (byte)blue);
break;
case PixelFormat.Gray_16bpp:
((ushort *)dstCol)[0] = Image.Rgb2Gray((ushort)red, (ushort)green, (ushort)blue);
break;
case PixelFormat.BGR_24bpp:
case PixelFormat.BGRX_32bpp:
dstCol[0] = (byte)blue;
dstCol[1] = (byte)green;
dstCol[2] = (byte)red;
break;
case PixelFormat.BGRA_32bpp:
dstCol[0] = (byte)blue;
dstCol[1] = (byte)green;
dstCol[2] = (byte)red;
dstCol[3] = (byte)alpha;
break;
case PixelFormat.RGBA_64bpp:
((ushort *)dstCol)[0] = (ushort)red;
((ushort *)dstCol)[1] = (ushort)green;
((ushort *)dstCol)[2] = (ushort)blue;
((ushort *)dstCol)[3] = (ushort)alpha;
break;
}
}
srcCol += srcBytesPerPixel;
dstCol += dstBytesPerPixel;
maskCol += maskBytesPerPixel;
}
srcRow += srcImage.Stride;
dstRow += dstImage.Stride;
if (maskImage != null)
{
maskRow += maskImage.Stride;
}
}
}
}
