void GetScreenshot(string rpMapName, int rpWidth, int rpHeight, int rpBitCount)
{
var rTimestamp = long.Parse(rpMapName.Substring(rpMapName.LastIndexOf('/') + 1));
var rHeight = Math.Abs(rpHeight);
using (var rMap = MemoryMappedFile.CreateOrOpen(rpMapName, rpWidth * rHeight * 3, MemoryMappedFileAccess.ReadWrite))
{
var rInfo = new NativeStructs.BITMAPINFO();
rInfo.bmiHeader.biSize = Marshal.SizeOf(typeof(NativeStructs.BITMAPINFOHEADER));
rInfo.bmiHeader.biWidth = rpWidth;
rInfo.bmiHeader.biHeight = rpHeight;
rInfo.bmiHeader.biBitCount = (ushort)rpBitCount;
rInfo.bmiHeader.biPlanes = 1;
IntPtr rBits;
var rHBitmap = NativeMethods.Gdi32.CreateDIBSection(IntPtr.Zero, ref rInfo, 0, out rBits, rMap.SafeMemoryMappedFileHandle.DangerousGetHandle(), 0);
if (rHBitmap == IntPtr.Zero)
{
throw new InvalidOperationException();
}
var rImage = Imaging.CreateBitmapSourceFromHBitmap(rHBitmap, IntPtr.Zero, new Int32Rect(0, 0, rpWidth, rHeight), BitmapSizeOptions.FromEmptyOptions());
rImage.Freeze();
r_TaskScreenshotTasks[rTimestamp].SetResult(rImage);
NativeMethods.Gdi32.DeleteObject(rHBitmap);
}
BrowserService.Instance.Communicator.Write(CommunicatorMessages.FinishScreenshotTransmission);
}
public static extern IntPtr CreateDIBSection(
IntPtr hdc,
ref NativeStructs.BITMAPINFO pbmi,
uint iUsage,
out IntPtr ppvBits,
IntPtr hSection,
uint dwOffset);
ScreenshotData TakeScreenshotCore(NativeInterfaces.IViewObject rpViewObject)
{
const int BitCount = 24;
var rEmbedElement = rpViewObject as HTMLEmbed;
var rWidth = rEmbedElement.clientWidth;
var rHeight = rEmbedElement.clientHeight;
var rScreenDC = NativeMethods.User32.GetDC(IntPtr.Zero);
var rHDC = NativeMethods.Gdi32.CreateCompatibleDC(rScreenDC);
var rInfo = new NativeStructs.BITMAPINFO();
rInfo.bmiHeader.biSize = Marshal.SizeOf(typeof(NativeStructs.BITMAPINFOHEADER));
rInfo.bmiHeader.biWidth = rWidth;
rInfo.bmiHeader.biHeight = rHeight;
rInfo.bmiHeader.biBitCount = BitCount;
rInfo.bmiHeader.biPlanes = 1;
IntPtr rBits;
var rHBitmap = NativeMethods.Gdi32.CreateDIBSection(rHDC, ref rInfo, 0, out rBits, IntPtr.Zero, 0);
var rOldObject = NativeMethods.Gdi32.SelectObject(rHDC, rHBitmap);
var rTargetDevice = new NativeStructs.DVTARGETDEVICE()
{
tdSize = 0
};
var rRect = new NativeStructs.RECT(0, 0, rWidth, rHeight);
var rEmptyRect = default(NativeStructs.RECT);
rpViewObject.Draw(1, 0, IntPtr.Zero, ref rTargetDevice, IntPtr.Zero, rHDC, ref rRect, ref rEmptyRect, IntPtr.Zero, IntPtr.Zero);
var rResult = new ScreenshotData(rWidth, rHeight, BitCount);
var rPixels = new byte[rWidth * rHeight * 3];
Marshal.Copy(rBits, rPixels, 0, rPixels.Length);
rResult.BitmapData = rPixels;
NativeMethods.Gdi32.SelectObject(rHDC, rOldObject);
NativeMethods.Gdi32.DeleteObject(rHBitmap);
NativeMethods.Gdi32.DeleteDC(rHDC);
NativeMethods.User32.ReleaseDC(IntPtr.Zero, rScreenDC);
return(rResult);
}
/// <summary>
/// Allocates a bitmap of the given height and width. Pixel data may be read/written directly,
/// and it may be drawn to the screen using PdnGraphics.DrawBitmap().
/// </summary>
/// <param name="width">The width of the bitmap to allocate.</param>
/// <param name="height">The height of the bitmap to allocate.</param>
/// <param name="handle">Receives a handle to the bitmap.</param>
/// <returns>A pointer to the bitmap's pixel data.</returns>
/// <remarks>
/// The following invariants may be useful for implementors:
/// * The bitmap is always 32-bits per pixel, BGRA.
/// * Stride for the bitmap is always width * 4.
/// * The upper-left pixel of the bitmap (0,0) is located at the first memory location pointed to by the returned pointer.
/// * The bitmap is top-down ("memory correct" ordering).
/// * The 'handle' may be any type of data you want, but must be unique for the lifetime of the bitmap, and must not be IntPtr.Zero.
/// * The handle's value must be understanded by PdnGraphics.DrawBitmap().
/// * The bitmap is always modified by directly reading and writing to the memory pointed to by the return value.
/// * PdnGraphics.DrawBitmap() must always render from this memory location (i.e. it must treat the memory as 'volatile')
/// </remarks>
public static IntPtr AllocateBitmap(int width, int height, out IntPtr handle)
{
var bmi = new NativeStructs.BITMAPINFO
{
bmiHeader =
{
biSize = (uint)sizeof(NativeStructs.BITMAPINFOHEADER),
biWidth = width,
biHeight = -height,
biPlanes = 1,
biBitCount = 32,
biCompression = NativeConstants.BI_RGB,
biSizeImage = 0,
biXPelsPerMeter = 96,
biYPelsPerMeter = 96,
biClrUsed = 0,
biClrImportant = 0
}
};
IntPtr pvBits;
IntPtr hBitmap = SafeNativeMethods.CreateDIBSection(
IntPtr.Zero,
ref bmi,
NativeConstants.DIB_RGB_COLORS,
out pvBits,
IntPtr.Zero,
0);
if (hBitmap == IntPtr.Zero)
{
throw new OutOfMemoryException("CreateDIBSection returned NULL (" + Marshal.GetLastWin32Error().ToString() + ") while attempting to allocate " + width + "x" + height + " bitmap");
}
handle = hBitmap;
long bytes = (long)width * (long)height * 4;
if (bytes > 0)
{
GC.AddMemoryPressure(bytes);
}
return(pvBits);
}
void GetScreenshot(string rpMapName, int rpWidth, int rpHeight, int rpBitCount)
{
var rTimestamp = long.Parse(rpMapName.Substring(rpMapName.LastIndexOf('/') + 1));
var rHeight = Math.Abs(rpHeight);
using (var rMap = MemoryMappedFile.CreateOrOpen(rpMapName, rpWidth * rHeight * 3, MemoryMappedFileAccess.ReadWrite))
{
var rInfo = new NativeStructs.BITMAPINFO();
rInfo.bmiHeader.biSize = Marshal.SizeOf(typeof(NativeStructs.BITMAPINFOHEADER));
rInfo.bmiHeader.biWidth = rpWidth;
rInfo.bmiHeader.biHeight = rpHeight;
rInfo.bmiHeader.biBitCount = (ushort)rpBitCount;
rInfo.bmiHeader.biPlanes = 1;
IntPtr rBits;
var rHBitmap = NativeMethods.Gdi32.CreateDIBSection(IntPtr.Zero, ref rInfo, 0, out rBits, rMap.SafeMemoryMappedFileHandle.DangerousGetHandle(), 0);
if (rHBitmap == IntPtr.Zero)
throw new InvalidOperationException();
var rImage = Imaging.CreateBitmapSourceFromHBitmap(rHBitmap, IntPtr.Zero, new Int32Rect(0, 0, rpWidth, rHeight), BitmapSizeOptions.FromEmptyOptions());
rImage.Freeze();
r_TaskScreenshotTasks[rTimestamp].SetResult(rImage);
NativeMethods.Gdi32.DeleteObject(rHBitmap);
}
BrowserService.Instance.Communicator.Write(CommunicatorMessages.FinishScreenshotTransmission);
}
ScreenshotData TakeScreenshotCore(NativeInterfaces.IViewObject rpViewObject)
{
const int BitCount = 24;
var rEmbedElement = rpViewObject as HTMLEmbed;
var rWidth = rEmbedElement.clientWidth;
var rHeight = rEmbedElement.clientHeight;
var rScreenDC = NativeMethods.User32.GetDC(IntPtr.Zero);
var rHDC = NativeMethods.Gdi32.CreateCompatibleDC(rScreenDC);
var rInfo = new NativeStructs.BITMAPINFO();
rInfo.bmiHeader.biSize = Marshal.SizeOf(typeof(NativeStructs.BITMAPINFOHEADER));
rInfo.bmiHeader.biWidth = rWidth;
rInfo.bmiHeader.biHeight = rHeight;
rInfo.bmiHeader.biBitCount = BitCount;
rInfo.bmiHeader.biPlanes = 1;
IntPtr rBits;
var rHBitmap = NativeMethods.Gdi32.CreateDIBSection(rHDC, ref rInfo, 0, out rBits, IntPtr.Zero, 0);
var rOldObject = NativeMethods.Gdi32.SelectObject(rHDC, rHBitmap);
var rTargetDevice = new NativeStructs.DVTARGETDEVICE() { tdSize = 0 };
var rRect = new NativeStructs.RECT(0, 0, rWidth, rHeight);
var rEmptyRect = default(NativeStructs.RECT);
rpViewObject.Draw(1, 0, IntPtr.Zero, ref rTargetDevice, IntPtr.Zero, rHDC, ref rRect, ref rEmptyRect, IntPtr.Zero, IntPtr.Zero);
var rResult = new ScreenshotData(rWidth, rHeight, BitCount);
var rPixels = new byte[rWidth * rHeight * 3];
Marshal.Copy(rBits, rPixels, 0, rPixels.Length);
rResult.BitmapData = rPixels;
NativeMethods.Gdi32.SelectObject(rHDC, rOldObject);
NativeMethods.Gdi32.DeleteObject(rHBitmap);
NativeMethods.Gdi32.DeleteDC(rHDC);
NativeMethods.User32.ReleaseDC(IntPtr.Zero, rScreenDC);
return rResult;
}
