public static (Point TopLeft, Point BottomRight) FindImageBounds([NotNull] Bitmap value, Color backColor, DimensionRestriction restriction = DimensionRestriction.None, int unitWidthLimit = 0, int unitHeightLimit = 0)
{
if (value.Width < 2 || value.Height < 2)
{
return(Point.Empty, Point.Empty);
}
int width = value.Width, height = value.Height;
Point topLeft = new Point();
Point bottomRight = new Point(width, height);
unitWidthLimit = unitWidthLimit.Within(0, width);
unitHeightLimit = unitHeightLimit.Within(0, height);
if (unitWidthLimit == width)
{
restriction |= DimensionRestriction.KeepWidth;
}
if (unitHeightLimit == height)
{
restriction |= DimensionRestriction.KeepHeight;
}
bool kw = restriction.FastHasFlag(DimensionRestriction.KeepWidth);
bool kh = restriction.FastHasFlag(DimensionRestriction.KeepHeight);
if (kw && kh)
{
return(topLeft, bottomRight);
}
bool kuw = unitWidthLimit > 0;
bool kuh = unitHeightLimit > 0;
bool found = false;
if (!kuw || !kuh)
{
for (int y = 0; y < height && !found; y++)
{
for (int x = 0; x < width && !found; x++)
{
Color c = value.GetPixel(x + 1, y + 1);
if (c.IsSame(backColor))
{
continue;
}
if (!kw && !kuw)
{
topLeft.X = x;
}
if (!kh && !kuh)
{
topLeft.Y = y;
}
found = true;
}
}
found = false;
}
for (int y = height; y > 0 && !found; y--)
{
for (int x = width; x > 0 && !found; x--)
{
Color c = value.GetPixel(x - 1, y - 1);
if (c.IsSame(backColor))
{
continue;
}
if (!kw)
{
bottomRight.X = x;
}
if (!kh)
{
bottomRight.Y = y;
}
found = true;
}
}
if (kuw && !kw)
{
bottomRight.X = bottomRight.X.Multiplier(unitWidthLimit);
}
if (kuh && !kh)
{
bottomRight.Y = bottomRight.Y.Multiplier(unitHeightLimit);
}
return(topLeft, bottomRight);
}
public static Bitmap Crop([NotNull] Bitmap value, Rectangle rectangle, DimensionRestriction restriction = DimensionRestriction.None)
{
// Check source format
if (!__formatTranslations.TryGetValue(value.PixelFormat, out PixelFormat formatTranslation))
{
throw new UnsupportedImageFormatException();
}
if (value.Width == 0 || value.Height == 0 || rectangle.IsEmpty)
{
return(null);
}
int width = value.Width, height = value.Height;
if (restriction.FastHasFlag(DimensionRestriction.KeepWidth))
{
rectangle.X = 0;
rectangle.Width = width;
}
if (restriction.FastHasFlag(DimensionRestriction.KeepHeight))
{
rectangle.Y = 0;
rectangle.Height = height;
}
if (rectangle.IsEmpty || rectangle.Width <= 0 || rectangle.Height <= 0)
{
return(null);
}
if (rectangle.X == 0 && rectangle.Y == 0 && rectangle.Width == width && rectangle.Height == height)
{
return(Clone(value));
}
if (rectangle.X + rectangle.Width > width)
{
rectangle.Width = width - rectangle.X;
}
if (rectangle.Y + rectangle.Height > height)
{
rectangle.Height = height - rectangle.Y;
}
BitmapData imageData = value.LockBits(new Rectangle(0, 0, value.Width, value.Height), ImageLockMode.ReadOnly, value.PixelFormat);
Bitmap bitmap;
try
{
Size newImageSize = rectangle.Size;
bitmap = formatTranslation == PixelFormat.Format8bppIndexed
? CreateGreyscaleImage(newImageSize.Width, newImageSize.Height)
: new Bitmap(newImageSize.Width, newImageSize.Height, formatTranslation);
BitmapData bitmapData = bitmap.LockBits(new Rectangle(0, 0, newImageSize.Width, newImageSize.Height), ImageLockMode.ReadWrite, formatTranslation);
try
{
// Process filter
Crop(new UnmanagedImage(imageData), new UnmanagedImage(bitmapData), rectangle);
}
finally
{
bitmap.UnlockBits(bitmapData);
}
if (value.HorizontalResolution > 0.0)
{
if (value.VerticalResolution > 0.0)
{
bitmap.SetResolution(value.HorizontalResolution, value.VerticalResolution);
}
}
}
finally
{
value.UnlockBits(imageData);
}
return(bitmap);
}