public static Bitmap ToGdiBitmap(BitmapSource bmp)
{
// below code refernces blog entry by luche:
// http://www.ruche-home.net/%A4%DC%A4%E4%A4%AD%A4%B4%A4%C8/2011-08-02/CopyPixels%20%A5%E1%A5%BD%A5%C3%A5%C9%A4%F2%CD%D1%A4%A4%A4%BF%20WPF%20BitmapSource%20%A4%AB%A4%E9%20GDI%20Bitmap%20%A4%D8%A4%CE%CA%D1%B4%B9
if (bmp.Format != PixelFormats.Bgra32)
{
// convert format
bmp = new FormatConvertedBitmap(bmp,
PixelFormats.Bgra32, null, 0);
bmp.Freeze();
}
// prepare values
var width = (int)bmp.Width;
var height = (int)bmp.Height;
var stride = width * 4;
// prepare buffer
var buffer = new byte[stride * height];
// copy to byte array
bmp.CopyPixels(buffer, stride, 0);
// create bitmap
var result = new Bitmap(width, height, SDI::PixelFormat.Format32bppArgb);
// set bitmap content
try
{
// locking bits
SDI::BitmapData bd = null;
try
{
bd = result.LockBits(new Rectangle(0, 0, width, height),
SDI::ImageLockMode.WriteOnly, SDI::PixelFormat.Format32bppArgb);
Marshal.Copy(buffer, 0, bd.Scan0, buffer.Length);
}
finally
{
if (bd != null)
{
result.UnlockBits(bd);
}
}
}
catch
{
result.Dispose();
throw;
}
return result;
}
/// <summary>
/// 从图片中获取背景颜色
/// </summary>
/// <param name="image">图片</param>
/// <param name="callback">计算完成后调用的委托</param>
public static void GetImageColorForBackgroundAsync(BitmapSource image, ComputeCompleteCallback callback)
{
FormatConvertedBitmap bitmap = null;
const int bytesPerPixel = 3;
byte[] pixels = null;
int width = 0;
int height = 0;
bool isFrozen = image.IsFrozen;
if (!isFrozen)
{
//由于image没有冻结，所以image不能跨线程使用，这时要在当前线程中将image转换为另一个位图
bitmap = new FormatConvertedBitmap(image, PixelFormats.Rgb24, BitmapPalettes.WebPalette, 0);
if (bitmap.CanFreeze) bitmap.Freeze();
pixels = new byte[bitmap.PixelHeight * bitmap.PixelWidth * bytesPerPixel];
bitmap.CopyPixels(pixels, bitmap.PixelWidth * bytesPerPixel, 0);
width = bitmap.PixelWidth;
height = bitmap.PixelHeight;
}
ThreadPool.QueueUserWorkItem(new WaitCallback((state) =>
{
if (isFrozen)
{
//由于image已经冻结，所以image可以跨线程使用，这时在新线程中将image转换为另一个位图
bitmap = new FormatConvertedBitmap(image, PixelFormats.Rgb24, BitmapPalettes.WebPalette, 0);
if (bitmap.CanFreeze) bitmap.Freeze();
pixels = new byte[bitmap.PixelHeight * bitmap.PixelWidth * bytesPerPixel];
bitmap.CopyPixels(pixels, bitmap.PixelWidth * bytesPerPixel, 0);
width = bitmap.PixelWidth;
height = bitmap.PixelHeight;
}
//计算颜色的均值
int sum = width * height;
int r = 0, g = 0, b = 0;
int offset = 0;
for (int i = 0; i < height; i++)
{
for (int j = 0; j < width; j++)
{
r += pixels[offset++];
g += pixels[offset++];
b += pixels[offset++];
}
}
r = r / sum;
g = g / sum;
b = b / sum;
Color color1 = Color.FromRgb((byte)r, (byte)g, (byte)b);
//计算图片右部的颜色均值
r = 0; g = 0; b = 0;
int jstart = (int)(width * (1 - RightSideWidth));
sum = (width - jstart) * width;
for (int i = 0; i < height; i++)
{
for (int j = jstart; j < width; j++)
{
r += pixels[(i * width + j) * bytesPerPixel + 0];
g += pixels[(i * width + j) * bytesPerPixel + 1];
b += pixels[(i * width + j) * bytesPerPixel + 2];
}
}
r = r / sum;
g = g / sum;
b = b / sum;
Color color2 = Color.FromRgb((byte)r, (byte)g, (byte)b);
//根据上面计算出来的两个颜色计算最终颜色
HSLColor hsl1 = new HSLColor(color1);
HSLColor hsl2 = new HSLColor(color2);
hsl1.Hue += 10;
if (IsNotSaturateEnough(hsl1) && !IsAlmostZeroSaturation(hsl1))
hsl1.Saturation += 0.2;
callback(Revise(hsl1, hsl2).ToRGB());
}));
}
/// キャプチャしたHBitmapをBitmapSource(Freezed)にして返す
/// @param request スクリーンキャプチャ設定をまとめたリクエスト
/// @return スクリーンキャプチャ結果が格納されたBitmapSource
private BitmapSource Capture(ScreenCaptureRequest request)
{
if (request.ClippingWidth <= 0 || request.ClippingHeight <= 0) {
// Debug.WriteLine("Invalid clipping size", "ScreenCaptureTimer.CaptureByGetDIBits");
return null;
}
// HBitmapからBitmapSourceを作成
BitmapSource bitmap = null;
using (var result = request.Execute()) {
if (result == null) return bitmap;
// HBitmapからBitmapSourceに変換
bitmap = Imaging.CreateBitmapSourceFromHBitmap(
result.Bitmap, IntPtr.Zero, Int32Rect.Empty,
BitmapSizeOptions.FromEmptyOptions());
// Debug.WriteLine(string.Format("Captured: {0:D}x{1:D}",
// bitmap.PixelWidth, bitmap.PixelHeight),
// "ScreenCapture");
}
// Alphaチャンネル情報を削除
bitmap = new FormatConvertedBitmap(bitmap, PixelFormats.Bgr32, null, 0.0);
/// @todo(me) あまり大きな画像をメモリにおいておきたくない。
/// とはいえ、TransformedBitmapはちょっと重過ぎる。
/// メモリよりもCPUリソースを残しておきたいのでこのままでいいかも。
//bitmap = this.Resize(bitmap);
// スレッド越しにアクセスされるためFreeze
bitmap.Freeze();
return bitmap;
}
/// <summary>
/// 从图片中获取背景颜色
/// </summary>
/// <param name="bitmap">图片</param>
public static Color GetImageColorForBackground(FormatConvertedBitmap bitmap)
{
const int bytesPerPixel = 3;
if (bitmap.CanFreeze) bitmap.Freeze();
var pixels = new byte[bitmap.PixelHeight * bitmap.PixelWidth * bytesPerPixel];
bitmap.CopyPixels(pixels, bitmap.PixelWidth * bytesPerPixel, 0);
var width = bitmap.PixelWidth;
var height = bitmap.PixelHeight;
//计算颜色的均值
Color color = GetColorOfRegion(pixels, width, height, 0, width, 0, height);
var hsl = new HslColor(color);
if (IsNotSaturateEnough(hsl) && !IsAlmostZeroSaturation(hsl))
hsl.Saturation += 0.2;
return Revise(hsl).ToRgb();
}
