public void AsCroppedInCorrectHeight(int imageIndex)
{
var i = imageIndex;
var cropSetup = new CropSetup {
LeftPx = 27 * 16, RightPx = 29 * 16, TopPx = 1 * 7, BottomPx = 6 * 16
};
var sourceFile = Common.GetSourceImagePath(i);
var image = ImageFrame.FromFile(sourceFile);
Assert.Throws <ArgumentException>(() => image.AsCroppedImage(cropSetup));
}
/// <summary>
/// Crops given image
/// </summary>
/// <param name="image">Image to crop</param>
/// <param name="cropSetup">Crop setup</param>
/// <returns>Cropped image</returns>
public static ImageFrame AsCroppedImage(this ImageFrame image, CropSetup cropSetup)
{
if (!cropSetup.IsAnyCropSet())
{
return(image);
}
var newWidthPx = image.ImageWidthPx - cropSetup.LeftPx - cropSetup.RightPx;
var newHeightPx = image.ImageHeightPx - cropSetup.TopPx - cropSetup.BottomPx;
var widthCheck = newWidthPx % 16;
if (widthCheck != 0)
{
throw new ArgumentException("New width is not divisible by 16!");
}
var heightCheck = newHeightPx % 16;
if (heightCheck != 0)
{
throw new ArgumentException("New height is not divisible by 16!");
}
var newImage = new byte[(newWidthPx * 3 * newHeightPx) + image.HeaderBytesLength];
//copy header from source and ...
image.Image.CopyBytesTo(0, newImage, 0, image.HeaderBytesLength);
//copy image bytes from source to new image
var leftCropBytes = (cropSetup.LeftPx * 3);
var imageWidthBytes = image.ImageWidthPx * 3;
var newImageWidthBytes = (newWidthPx * 3);
var destRow = 0;
//read rows
for (var i = cropSetup.BottomPx; i < newHeightPx + cropSetup.BottomPx; i++)
{
var srcOffSet = (leftCropBytes + (i * imageWidthBytes) + image.HeaderBytesLength);
var destOffSet = (destRow++ *newImageWidthBytes + image.HeaderBytesLength);
image.Image.CopyBytesTo(srcOffSet, newImage, destOffSet, newImageWidthBytes);
}
var ret = new ImageFrame(newImage);
//.. adjust header with new width and size
ret.SetSizeInfo((uint)newImage.Length, newWidthPx, newHeightPx);
return(ret);
}
public void AsHuffmanEncodedAndDecodedWithSave(int imageIndex)
{
var i = imageIndex;
var cropSetup = new CropSetup {
LeftPx = 27 * 16, RightPx = 29 * 16, TopPx = 1 * 16, BottomPx = 6 * 16
};
var sourceFile = Common.GetSourceImagePath(i);
var image = ImageFrame.FromFile(sourceFile).AsCroppedImage(cropSetup).AsGrayScale();
var encodedFilename = Common.GetSaveImagePath(i, "gray-huffman-encoded");
image.AsHuffmanEncoded().Save(encodedFilename);
var encoded = new HuffmanImageFrame().Open(encodedFilename);
var decodedFilename = Common.GetSaveImagePath(i, "gray-huffman-decoded.bmp");
encoded.AsImageGrayScaleFrame().Save(decodedFilename);
var decoded = ImageFrame.FromFile(decodedFilename);
Assert.True(image.Image.Compare(decoded.Image));
}