private void HistMenuItem_Click(object sender, EventArgs e)
{
if (m_bitmap == null)
{
return;
}
TiHistogram histogram = null;
try
{
BitmapData bitmapData = m_bitmap.LockBits(new Rectangle(0, 0, m_bitmap.Width, m_bitmap.Height),
ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
IntPtr ptr = NativeMethods.GetImageHistogram(bitmapData.Scan0, bitmapData.Width, bitmapData.Height, bitmapData.Stride, m_bpp);
if (ptr != null)
{
histogram = (TiHistogram)Marshal.PtrToStructure(ptr, typeof(TiHistogram));
Marshal.DestroyStructure(ptr, typeof(TiHistogram)); //销毁非托管的内存
}
m_bitmap.UnlockBits(bitmapData);
}
catch (System.Exception ex)
{
Console.WriteLine(ex.ToString());
}
if (histogram != null)
{
HistogramForm form = new HistogramForm(histogram);
form.ShowDialog();
}
}
public HistogramForm(TiHistogram histogram)
{
InitializeComponent();
m_histogram = histogram;
m_currentValues = m_histogram.rgbValues;
m_color = Color.Gray;
}