// Get the image's bounds.
public static Rectangle ImageBounds(Bitmap32 bm32)
{
// ymin.
int ymin = bm32.Height - 1;
for (int y = 0; y < bm32.Height; y++)
{
if (!RowIsWhite(bm32, y))
{
ymin = y;
break;
}
}
// ymax.
int ymax = 0;
for (int y = bm32.Height - 1; y >= ymin; y--)
{
if (!RowIsWhite(bm32, y))
{
ymax = y;
break;
}
}
// xmin.
int xmin = bm32.Width - 1;
for (int x = 0; x < bm32.Width; x++)
{
if (!ColumnIsWhite(bm32, x))
{
xmin = x;
break;
}
}
// xmax.
int xmax = 0;
for (int x = bm32.Width - 1; x >= xmin; x--)
{
if (!ColumnIsWhite(bm32, x))
{
xmax = x;
break;
}
}
// Build the rectangle.
return(new Rectangle(xmin, ymin,
xmax - xmin + 1, ymax - ymin + 1));
}
// Return true if this column is all white.
private static bool ColumnIsWhite(Bitmap32 bm32, int x)
{
byte r, g, b, a;
int count = 0;
for (int y = 0; y < bm32.Height; y++)
{
bm32.GetPixel(x, y, out r, out g, out b, out a);
if (((r < 250) || (g < 250) || (b < 250)) && ((r > 2) || (g > 2) || (b > 2)))
{
count++;
}
if (count > bm32.Height / 10)
{
return(false);
}
}
return(true);
}
// Return true if this row is all white.
private static bool RowIsWhite(Bitmap32 bm32, int y)
{
byte r, g, b, a;
int count = 0;
for (int x = 0; x < bm32.Width; x++)
{
bm32.GetPixel(x, y, out r, out g, out b, out a);
if (((r < 250) || (g < 250) || (b < 250)) && ((r > 2) || (g > 2) || (b > 2)))
{
count++;
}
if (count > bm32.Width / 10)
{
return(false);
}
}
return(true);
}
private void CaptureScaledScreen(object state)
{
try
{
var count = Interlocked.Increment(ref executionCount);
var size = new System.Drawing.Size((int)System.Windows.SystemParameters.WorkArea.Width, (int)System.Windows.SystemParameters.WorkArea.Height);
using (var screenBmp = new Bitmap(size.Width, size.Height))
{
var destRect = new Rectangle(0, 0, this.width, this.height);
var destImage = new Bitmap(this.width, this.height);
using (Graphics screenGraphics = Graphics.FromImage(screenBmp),
destGraphics = Graphics.FromImage(destImage)
)
{
screenGraphics.CopyFromScreen(new System.Drawing.Point(0, 0), new System.Drawing.Point(0, 0), size);
Bitmap32 bm32 = new Bitmap32(screenBmp);
bm32.LockBitmap();
Rectangle src_rect = Bitmap32.ImageBounds(bm32);
bm32.UnlockBitmap();
// Copy the non-white area.
int wid = src_rect.Width;
int hgt = src_rect.Height;
Bitmap bm = new Bitmap(wid, hgt);
using (Graphics gr = Graphics.FromImage(bm))
{
gr.Clear(Color.White);
Rectangle dest_rect = new Rectangle(
0, 0, src_rect.Width, src_rect.Height);
gr.DrawImage(screenBmp, dest_rect, src_rect, GraphicsUnit.Pixel);
}
destGraphics.CompositingMode = System.Drawing.Drawing2D.CompositingMode.SourceCopy;
destGraphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Bicubic;
//destGraphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
using (var wrapMode = new System.Drawing.Imaging.ImageAttributes())
{
wrapMode.SetWrapMode(System.Drawing.Drawing2D.WrapMode.TileFlipXY);
destGraphics.DrawImage(bm, destRect, 0, 0, bm.Width, bm.Height, GraphicsUnit.Pixel, wrapMode);
}
//destImage.Save("test.png");
}
this.ExtractColors(destImage);
}
}
catch (Exception)
{
}
}