public static Rectangle GetNonTransparentRect(IBitmap bmp)
{
int w = bmp.Width;
int h = bmp.Height;
int topmost = 0;
for (int row = 0; row < h; ++row)
{
if (!bmp.EmptyRow(row))
{
break;
}
topmost = row;
}
int bottommost = 0;
for (int row = h - 1; row >= 0; --row)
{
if (!bmp.EmptyRow(row))
{
break;
}
bottommost = row;
}
int leftmost = 0, rightmost = 0;
for (int col = 0; col < w; ++col)
{
if (!bmp.EmptyColumn(col))
{
break;
}
leftmost = col;
}
for (int col = w - 1; col >= 0; --col)
{
if (!bmp.EmptyColumn(col))
{
break;
}
rightmost = col;
}
if (rightmost == 0)
{
rightmost = w; // As reached left
}
if (bottommost == 0)
{
bottommost = h; // As reached top.
}
int croppedWidth = rightmost - leftmost;
int croppedHeight = bottommost - topmost;
if (croppedWidth == 0) // No border on left or right
{
leftmost = 0;
croppedWidth = w;
}
if (croppedHeight == 0) // No border on top or bottom
{
topmost = 0;
croppedHeight = h;
}
try
{
return(new Rectangle(leftmost, topmost, croppedWidth, croppedHeight));
}
catch (Exception ex)
{
throw new Exception(
string.Format("Values are topmost={0} btm={1} left={2} right={3} croppedWidth={4} croppedHeight={5}", topmost, bottommost, leftmost, rightmost, croppedWidth, croppedHeight),
ex);
}
}