private static void Rotate90(ImageBase source, ImageBase target)
{
Contract.Requires(source != null);
Contract.Requires(source.IsFilled);
Contract.Requires(target != null);
Contract.Ensures(target.IsFilled);
int oldIndex = 0, newIndex = 0;
byte[] sourcePixels = source.Pixels;
byte[] targetPixels = new byte[source.PixelWidth * source.PixelHeight * 4];
for (int y = 0; y < source.PixelHeight; y++)
{
for (int x = 0; x < source.PixelWidth; x++)
{
oldIndex = (y * source.PixelWidth + x) * 4;
// The new index will just be calculated by swapping
// the x and the y value for the pixel.
newIndex = ((x + 1) * source.PixelHeight - y - 1) * 4;
targetPixels[newIndex + 0] = sourcePixels[oldIndex + 0];
targetPixels[newIndex + 1] = sourcePixels[oldIndex + 1];
targetPixels[newIndex + 2] = sourcePixels[oldIndex + 2];
targetPixels[newIndex + 3] = sourcePixels[oldIndex + 3];
}
}
target.SetPixels(source.PixelHeight, source.PixelWidth, targetPixels);
}
private static void Rotate270(ImageBase source, ImageBase target)
{
Contract.Requires(source != null);
Contract.Requires(source.IsFilled);
Contract.Requires(target != null);
Contract.Ensures(target.IsFilled);
int oldIndex = 0, newIndex = 0;
byte[] sourcePixels = source.Pixels;
byte[] targetPixels = new byte[source.PixelWidth * source.PixelHeight * 4];
for (int y = 0; y < source.PixelHeight; y++)
{
for (int x = 0; x < source.PixelWidth; x++)
{
oldIndex = (y * source.PixelWidth + x) * 4;
// The new index will be calculated as if the image would be flipped
// at the x and the y axis and rotated about 90 degrees.
newIndex = ((source.PixelWidth - x - 1) * source.PixelHeight + y) * 4;
targetPixels[newIndex + 0] = sourcePixels[oldIndex + 0];
targetPixels[newIndex + 1] = sourcePixels[oldIndex + 1];
targetPixels[newIndex + 2] = sourcePixels[oldIndex + 2];
targetPixels[newIndex + 3] = sourcePixels[oldIndex + 3];
}
}
target.SetPixels(source.PixelHeight, source.PixelWidth, targetPixels);
}
internal static void Crop(ImageBase source, ImageBase target, Rectangle bounds)
{
Contract.Requires <ArgumentNullException>(source != null, "Source image cannot be null.");
Contract.Requires <ArgumentException>(source.IsFilled, "Source image has not been loaded.");
Contract.Requires <ArgumentNullException>(target != null, "Target image cannot be null.");
Guard.GreaterThan(bounds.Width, 0, "bounds",
"Width of the rectangle must be greater than zero.");
Guard.GreaterThan(bounds.Height, 0, "bounds",
"Height of the rectangle must be greater than zero.");
if (bounds.Right > source.PixelWidth || bounds.Bottom > source.PixelHeight)
{
throw new ArgumentException(
"Rectangle must be in the range of the image's dimension.", "bounds");
}
byte[] sourcePixels = source.Pixels;
byte[] targetPixels = new byte[bounds.Width * bounds.Height * 4];
for (int y = bounds.Top, i = 0; y < bounds.Bottom; y++, i++)
{
Array.Copy(sourcePixels, (y * source.PixelWidth + bounds.Left) * 4, targetPixels, i * bounds.Width * 4, bounds.Width * 4);
}
target.SetPixels(bounds.Width, bounds.Height, targetPixels);
}
/// <summary>
/// Transforms the specified image by flipping and rotating it. First the image
/// will be rotated, then the image will be flipped. A new image will be returned. The original image
/// will not be changed.
/// </summary>
/// <param name="source">The image, which should be transformed.</param>
/// <param name="target">The new transformed image.</param>
/// <param name="rotationType">Type of the rotation.</param>
/// <param name="flippingType">Type of the flipping.</param>
/// <exception cref="ArgumentNullException">
/// <para><paramref name="source"/> is null (Nothing in Visual Basic).</para>
/// <para>- or -</para>
/// <para><paramref name="target"/> is null (Nothing in Visual Basic).</para>
/// </exception>
internal static void Transform(ImageBase source, ImageBase target, RotationType rotationType, FlippingType flippingType)
{
Contract.Requires <ArgumentNullException>(source != null, "Source image cannot be null.");
Contract.Requires <ArgumentException>(source.IsFilled, "Source image has not been loaded.");
Contract.Requires <ArgumentNullException>(target != null, "Target image cannot be null.");
switch (rotationType)
{
case RotationType.None:
{
byte[] targetPixels = source.Pixels;
byte[] sourcePixels = new byte[targetPixels.Length];
Array.Copy(targetPixels, sourcePixels, targetPixels.Length);
target.SetPixels(source.PixelWidth, source.PixelHeight, sourcePixels);
}
break;
case RotationType.Rotate90:
{
Rotate90(source, target);
}
break;
case RotationType.Rotate180:
{
Rotate180(source, target);
}
break;
case RotationType.Rotate270:
{
Rotate270(source, target);
}
break;
default:
throw new InvalidOperationException();
}
switch (flippingType)
{
case FlippingType.FlipX:
FlipX(target);
break;
case FlippingType.FlipY:
FlipY(target);
break;
}
}
/// <summary>
/// Transforms the specified image by flipping and rotating it. First the image
/// will be rotated, then the image will be flipped. A new image will be returned. The original image
/// will not be changed.
/// </summary>
/// <param name="source">The image, which should be transformed.</param>
/// <param name="target">The new transformed image.</param>
/// <param name="rotationType">Type of the rotation.</param>
/// <param name="flippingType">Type of the flipping.</param>
/// <exception cref="ArgumentNullException">
/// <para><paramref name="source"/> is null (Nothing in Visual Basic).</para>
/// <para>- or -</para>
/// <para><paramref name="target"/> is null (Nothing in Visual Basic).</para>
/// </exception>
internal static void Transform(ImageBase source, ImageBase target, RotationType rotationType, FlippingType flippingType)
{
Contract.Requires<ArgumentNullException>(source != null, "Source image cannot be null.");
Contract.Requires<ArgumentException>(source.IsFilled, "Source image has not been loaded.");
Contract.Requires<ArgumentNullException>(target != null, "Target image cannot be null.");
switch (rotationType)
{
case RotationType.None:
{
byte[] targetPixels = source.Pixels;
byte[] sourcePixels = new byte[targetPixels.Length];
Array.Copy(targetPixels, sourcePixels, targetPixels.Length);
target.SetPixels(source.PixelWidth, source.PixelHeight, sourcePixels);
}
break;
case RotationType.Rotate90:
{
Rotate90(source, target);
}
break;
case RotationType.Rotate180:
{
Rotate180(source, target);
}
break;
case RotationType.Rotate270:
{
Rotate270(source, target);
}
break;
default:
throw new InvalidOperationException();
}
switch (flippingType)
{
case FlippingType.FlipX:
FlipX(target);
break;
case FlippingType.FlipY:
FlipY(target);
break;
}
}
public void Resize(ImageBase source, ImageBase target, int width, int height)
{
byte[] newPixels = new byte[width * height * 4];
byte[] sourcePixels = source.Pixels;
var GetColor = new Func<double, double, int, byte>((x, y, offset) => sourcePixels[(int)((y * source.PixelWidth + x) * 4 + offset)]);
double factorX = (double)source.PixelWidth / width;
double factorY = (double)source.PixelHeight / height;
double fractionX, oneMinusX, l, r;
double fractionY, oneMinusY, t, b;
byte c1, c2, c3, c4, b1, b2;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
int dstOffset = (y * width + x) * 4;
l = (int)System.Math.Floor(x * factorX);
t = (int)System.Math.Floor(y * factorY);
r = l + 1;
b = t + 1;
if (r >= source.PixelWidth)
{
r = l;
}
if (b >= source.PixelHeight)
{
b = t;
}
fractionX = x * factorX - l;
fractionY = y * factorY - t;
oneMinusX = 1.0 - fractionX;
oneMinusY = 1.0 - fractionY;
var function = new Func<int, byte>(offset =>
{
c1 = GetColor(l, t, offset);
c2 = GetColor(r, t, offset);
c3 = GetColor(l, b, offset);
c4 = GetColor(r, b, offset);
b1 = (byte)(oneMinusX * c1 + fractionX * c2);
b2 = (byte)(oneMinusX * c3 + fractionX * c4);
return (byte)(oneMinusY * b1 + fractionY * b2);
});
newPixels[dstOffset + 0] = function(0);
newPixels[dstOffset + 1] = function(1);
newPixels[dstOffset + 2] = function(2);
newPixels[dstOffset + 3] = function(3);
}
}
target.SetPixels(width, height, newPixels);
}
private static void Rotate270(ImageBase source, ImageBase target)
{
Contract.Requires(source != null);
Contract.Requires(source.IsFilled);
Contract.Requires(target != null);
Contract.Ensures(target.IsFilled);
int oldIndex = 0, newIndex = 0;
byte[] sourcePixels = source.Pixels;
byte[] targetPixels = new byte[source.PixelWidth * source.PixelHeight * 4];
for (int y = 0; y < source.PixelHeight; y++)
{
for (int x = 0; x < source.PixelWidth; x++)
{
oldIndex = (y * source.PixelWidth + x) * 4;
// The new index will be calculated as if the image would be flipped
// at the x and the y axis and rotated about 90 degrees.
newIndex = ((source.PixelWidth - x - 1) * source.PixelHeight + y) * 4;
targetPixels[newIndex + 0] = sourcePixels[oldIndex + 0];
targetPixels[newIndex + 1] = sourcePixels[oldIndex + 1];
targetPixels[newIndex + 2] = sourcePixels[oldIndex + 2];
targetPixels[newIndex + 3] = sourcePixels[oldIndex + 3];
}
}
target.SetPixels(source.PixelHeight, source.PixelWidth, targetPixels);
}
internal static void Crop(ImageBase source, ImageBase target, Rectangle bounds)
{
Contract.Requires<ArgumentNullException>(source != null, "Source image cannot be null.");
Contract.Requires<ArgumentException>(source.IsFilled, "Source image has not been loaded.");
Contract.Requires<ArgumentNullException>(target != null, "Target image cannot be null.");
Guard.GreaterThan(bounds.Width, 0, "bounds",
"Width of the rectangle must be greater than zero.");
Guard.GreaterThan(bounds.Height, 0, "bounds",
"Height of the rectangle must be greater than zero.");
if (bounds.Right > source.PixelWidth || bounds.Bottom > source.PixelHeight)
{
throw new ArgumentException(
"Rectangle must be in the range of the image's dimension.", "bounds");
}
byte[] sourcePixels = source.Pixels;
byte[] targetPixels = new byte[bounds.Width * bounds.Height * 4];
for (int y = bounds.Top, i = 0; y < bounds.Bottom; y++, i++)
{
Array.Copy(sourcePixels, (y * source.PixelWidth + bounds.Left) * 4, targetPixels, i * bounds.Width * 4, bounds.Width * 4);
}
target.SetPixels(bounds.Width, bounds.Height, targetPixels);
}
private static void Rotate90(ImageBase source, ImageBase target)
{
Contract.Requires(source != null);
Contract.Requires(source.IsFilled);
Contract.Requires(target != null);
Contract.Ensures(target.IsFilled);
int oldIndex = 0, newIndex = 0;
byte[] sourcePixels = source.Pixels;
byte[] targetPixels = new byte[source.PixelWidth * source.PixelHeight * 4];
for (int y = 0; y < source.PixelHeight; y++)
{
for (int x = 0; x < source.PixelWidth; x++)
{
oldIndex = (y * source.PixelWidth + x) * 4;
// The new index will just be calculated by swapping
// the x and the y value for the pixel.
newIndex = ((x + 1) * source.PixelHeight - y - 1) * 4;
targetPixels[newIndex + 0] = sourcePixels[oldIndex + 0];
targetPixels[newIndex + 1] = sourcePixels[oldIndex + 1];
targetPixels[newIndex + 2] = sourcePixels[oldIndex + 2];
targetPixels[newIndex + 3] = sourcePixels[oldIndex + 3];
}
}
target.SetPixels(source.PixelHeight, source.PixelWidth, targetPixels);
}
