// Checks whether an area of a bitmap contains entirely the specified alpha value.
public static bool IsAlphaEntirely(byte expectedAlpha, BitmapContent bitmap, Rectangle? region = null)
{
var bitmapRegion = region.HasValue ? region.Value : new Rectangle(0, 0, bitmap.Width, bitmap.Height);
// Works with PixelBitmapContent<byte> at this stage
if (bitmap is PixelBitmapContent<byte>)
{
var bmp = bitmap as PixelBitmapContent<byte>;
for (int y = 0; y < bitmapRegion.Height; y++)
{
for (int x = 0; x < bitmapRegion.Width; x++)
{
var alpha = bmp.GetPixel(bitmapRegion.X + x, bitmapRegion.Y + y);
if (alpha != expectedAlpha)
return false;
}
}
return true;
}
else if (bitmap is PixelBitmapContent<Color>)
{
var bmp = bitmap as PixelBitmapContent<Color>;
for (int y = 0; y < bitmapRegion.Height; y++)
{
for (int x = 0; x < bitmapRegion.Width; x++)
{
var alpha = bmp.GetPixel(bitmapRegion.X + x, bitmapRegion.Y + y).A;
if (alpha != expectedAlpha)
return false;
}
}
return true;
}
throw new ArgumentException("Expected PixelBitmapContent<byte> or PixelBitmapContent<Color>, got " + bitmap.GetType().Name, "bitmap");
}
internal static BitmapContent Resize(this BitmapContent bitmap, int newWidth, int newHeight)
{
BitmapContent src = bitmap;
SurfaceFormat format;
src.TryGetFormat(out format);
if (format != SurfaceFormat.Vector4)
{
var v4 = new PixelBitmapContent <Vector4>(src.Width, src.Height);
BitmapContent.Copy(src, v4);
src = v4;
}
// Convert to FreeImage bitmap
var bytes = src.GetPixelData();
var fi = FreeImage.ConvertFromRawBits(bytes, FREE_IMAGE_TYPE.FIT_RGBAF, src.Width, src.Height, SurfaceFormat.Vector4.GetSize() * src.Width, 128, 0, 0, 0, true);
// Resize
var newfi = FreeImage.Rescale(fi, newWidth, newHeight, FREE_IMAGE_FILTER.FILTER_BICUBIC);
FreeImage.UnloadEx(ref fi);
// Convert back to PixelBitmapContent<Vector4>
src = new PixelBitmapContent <Vector4>(newWidth, newHeight);
bytes = new byte[SurfaceFormat.Vector4.GetSize() * newWidth * newHeight];
FreeImage.ConvertToRawBits(bytes, newfi, SurfaceFormat.Vector4.GetSize() * newWidth, 128, 0, 0, 0, true);
src.SetPixelData(bytes);
FreeImage.UnloadEx(ref newfi);
// Convert back to source type if required
if (format != SurfaceFormat.Vector4)
{
var s = (BitmapContent)Activator.CreateInstance(bitmap.GetType(), new object[] { newWidth, newHeight });
BitmapContent.Copy(src, s);
src = s;
}
return(src);
}
// Checks whether an area of a bitmap contains entirely the specified alpha value.
public static bool IsAlphaEntirely(byte expectedAlpha, BitmapContent bitmap, Rectangle?region = null)
{
var bitmapRegion = region.HasValue ? region.Value : new Rectangle(0, 0, bitmap.Width, bitmap.Height);
// Works with PixelBitmapContent<byte> at this stage
if (bitmap is PixelBitmapContent <byte> )
{
var bmp = bitmap as PixelBitmapContent <byte>;
for (int y = 0; y < bitmapRegion.Height; y++)
{
for (int x = 0; x < bitmapRegion.Width; x++)
{
var alpha = bmp.GetPixel(bitmapRegion.X + x, bitmapRegion.Y + y);
if (alpha != expectedAlpha)
{
return(false);
}
}
}
return(true);
}
else if (bitmap is PixelBitmapContent <Color> )
{
var bmp = bitmap as PixelBitmapContent <Color>;
for (int y = 0; y < bitmapRegion.Height; y++)
{
for (int x = 0; x < bitmapRegion.Width; x++)
{
var alpha = bmp.GetPixel(bitmapRegion.X + x, bitmapRegion.Y + y).A;
if (alpha != expectedAlpha)
{
return(false);
}
}
}
return(true);
}
throw new ArgumentException("Expected PixelBitmapContent<byte> or PixelBitmapContent<Color>, got " + bitmap.GetType().Name, "bitmap");
}
