public static bool ApplyImageToMask(
CanvasRenderTarget image,
CanvasRenderTarget mask,
CanvasRenderTarget canvas,
Color maskColor,
bool NoAlphaAtBoundary)
{
if (image == null || mask == null || canvas == null)
{
return(false);
}
byte[] pixelsImage = image.GetPixelBytes();
byte[] pixelsMask = mask.GetPixelBytes();
byte[] pixelsCanvas = canvas.GetPixelBytes();
if (pixelsImage == null || pixelsMask == null || pixelsCanvas == null)
{
return(false);
}
uint col = 0;
uint image_stride = image.SizeInPixels.Width;
uint stride = canvas.SizeInPixels.Width;
uint mask_stride = mask.SizeInPixels.Width;
for (uint row = 0; row < canvas.SizeInPixels.Height; ++row)
{
uint total_row_len = (uint)(row * stride);
uint total_row_mask_len = (uint)(row * mask_stride);
uint total_row_image_len = (uint)(row * image_stride);
for (col = 0; col < canvas.SizeInPixels.Width; ++col)
{
if (row >= image.SizeInPixels.Height || col >= image.SizeInPixels.Width)
{
continue;
}
if (row >= mask.SizeInPixels.Height || col >= mask.SizeInPixels.Width)
{
continue;
}
uint index = (total_row_len + col) * 4;
uint indexMask = (total_row_mask_len + col) * 4;
uint indexImage = (total_row_image_len + col) * 4;
byte maskByte = 0;
if (MaskColor.IsEqual(maskColor, MaskColor.Red))
{
maskByte = pixelsMask[indexMask + 2];
}
else if (MaskColor.IsEqual(maskColor, MaskColor.Green))
{
maskByte = pixelsMask[indexMask + 1];
}
else if (MaskColor.IsEqual(maskColor, MaskColor.Blue))
{
maskByte = pixelsMask[indexMask];
}
if (maskByte > 0)
{
uint pixels_canvas = (uint)((pixelsCanvas[index + 3] << 24) | (pixelsCanvas[index + 2] << 16) | (pixelsCanvas[index + 1] << 8) | pixelsCanvas[index]);
uint pixels_image = (uint)((pixelsImage[index + 3] << 24) | (pixelsImage[index + 2] << 16) | (pixelsImage[index + 1] << 8) | pixelsImage[index]);
if (NoAlphaAtBoundary)
{
uint result = AlphablendNoAlphaAtBoundary(pixels_canvas, pixels_image, pixelsMask[indexMask + 3], pixelsMask[indexMask + 3]);
pixelsCanvas[index + 3] = (byte)((result & 0xff000000) >> 24);
pixelsCanvas[index + 2] = (byte)((result & 0xff0000) >> 16);
pixelsCanvas[index + 1] = (byte)((result & 0xff00) >> 8);
pixelsCanvas[index] = (byte)(result & 0xff);
}
else
{
uint result = Alphablend(pixels_canvas, pixels_image, pixelsMask[indexMask + 3], pixelsMask[indexMask + 3]);
pixelsCanvas[index + 3] = (byte)((result & 0xff000000) >> 24);
pixelsCanvas[index + 2] = (byte)((result & 0xff0000) >> 16);
pixelsCanvas[index + 1] = (byte)((result & 0xff00) >> 8);
pixelsCanvas[index] = (byte)(result & 0xff);
}
}
}
}
canvas.SetPixelBytes(pixelsCanvas);
return(true);
}
public static bool ApplyShadowToMask(
Color clrShadow,
CanvasRenderTarget mask,
CanvasRenderTarget canvas,
Color maskColor,
Point offset)
{
if (mask == null || canvas == null)
{
return(false);
}
byte[] pixelsMask = mask.GetPixelBytes();
byte[] pixelsCanvas = canvas.GetPixelBytes();
if (pixelsMask == null || pixelsCanvas == null)
{
return(false);
}
uint col = 0;
uint stride = canvas.SizeInPixels.Width;
uint mask_stride = mask.SizeInPixels.Width;
for (uint row = 0; row < canvas.SizeInPixels.Height; ++row)
{
uint total_row_len = (uint)(row * stride);
uint total_row_mask_len = (uint)((row - offset.Y) * mask_stride);
for (col = 0; col < canvas.SizeInPixels.Width; ++col)
{
if ((row - offset.Y) >= mask.SizeInPixels.Height || (col - offset.X) >= mask.SizeInPixels.Width ||
(row - offset.Y) < 0 || (col - offset.X) < 0)
{
continue;
}
uint index = (total_row_len + col) * 4;
uint indexMask = (uint)((total_row_mask_len + (col - offset.X)) * 4);
byte maskByte = 0;
if (MaskColor.IsEqual(maskColor, MaskColor.Red))
{
maskByte = pixelsMask[indexMask + 2];
}
else if (MaskColor.IsEqual(maskColor, MaskColor.Green))
{
maskByte = pixelsMask[indexMask + 1];
}
else if (MaskColor.IsEqual(maskColor, MaskColor.Blue))
{
maskByte = pixelsMask[indexMask];
}
uint color = (uint)(0xff << 24 | clrShadow.R << 16 | clrShadow.G << 8 | clrShadow.B);
if (maskByte > 0)
{
uint pixels_canvas = (uint)((pixelsCanvas[index + 3] << 24) | (pixelsCanvas[index + 2] << 16) | (pixelsCanvas[index + 1] << 8) | pixelsCanvas[index]);
uint result = Alphablend(pixels_canvas, color, pixelsMask[indexMask + 3], (byte)(pixelsMask[indexMask + 3] * clrShadow.A / 255));
pixelsCanvas[index + 3] = (byte)((result & 0xff000000) >> 24);
pixelsCanvas[index + 2] = (byte)((result & 0xff0000) >> 16);
pixelsCanvas[index + 1] = (byte)((result & 0xff00) >> 8);
pixelsCanvas[index] = (byte)(result & 0xff);
}
}
}
canvas.SetPixelBytes(pixelsCanvas);
return(true);
}
public static bool MeasureMaskLength(
CanvasRenderTarget mask,
Color maskColor,
out uint top,
out uint left,
out uint bottom,
out uint right)
{
top = 30000;
left = 30000;
bottom = 0;
right = 0;
if (mask == null)
{
return(false);
}
byte[] pixelsMask = mask.GetPixelBytes();
if (pixelsMask == null)
{
return(false);
}
uint col = 0;
uint stride = mask.SizeInPixels.Width;
for (uint row = 0; row < mask.SizeInPixels.Height; ++row)
{
uint total_row_len = (uint)(row * stride);
for (col = 0; col < mask.SizeInPixels.Width; ++col)
{
uint index = total_row_len + col;
byte nAlpha = 0;
if (MaskColor.IsEqual(maskColor, MaskColor.Red))
{
nAlpha = pixelsMask[index + 2];
}
else if (MaskColor.IsEqual(maskColor, MaskColor.Green))
{
nAlpha = pixelsMask[index + 1];
}
else if (MaskColor.IsEqual(maskColor, MaskColor.Blue))
{
nAlpha = pixelsMask[index];
}
if (nAlpha > 0)
{
if (col < left)
{
left = col;
}
if (row < top)
{
top = row;
}
if (col > right)
{
right = col;
}
if (row > bottom)
{
bottom = row;
}
}
}
}
return(true);
}