Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / CommonUI / System / Drawing / BufferedGraphicsContext.cs / 1305376 / BufferedGraphicsContext.cs
//------------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//-----------------------------------------------------------------------------
namespace System.Drawing {
using System;
using System.ComponentModel;
using System.Collections;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Text;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Threading;
using System.Security;
using System.Security.Permissions;
using System.Runtime.Versioning;
///
/// The BufferedGraphicsContext class can be used to perform standard double buffer
/// rendering techniques.
///
public sealed class BufferedGraphicsContext : IDisposable {
private Size maximumBuffer;
private Size bufferSize;
private Size virtualSize;
private Point targetLoc;
private IntPtr compatDC;
private IntPtr dib;
private IntPtr oldBitmap;
private Graphics compatGraphics;
private BufferedGraphics buffer;
private int busy;
private bool invalidateWhenFree;
private const int BUFFER_FREE = 0; //the graphics buffer is free to use
private const int BUFFER_BUSY_PAINTING = 1; //graphics buffer is busy being created/painting
private const int BUFFER_BUSY_DISPOSING = 2; //graphics buffer is busy disposing
static TraceSwitch doubleBuffering;
#if DEBUG
string stackAtBusy;
#endif
///
/// Basic constructor.
///
public BufferedGraphicsContext() {
//by defualt, the size of our maxbuffer will be 3 x standard button size
maximumBuffer.Width = 75 * 3;
maximumBuffer.Height = 32 * 3;
bufferSize = Size.Empty;
}
///
/// Destructor.
///
~BufferedGraphicsContext() {
Dispose(false);
}
//Internal trace switch for debugging
//
internal static TraceSwitch DoubleBuffering {
get {
if (doubleBuffering == null) {
doubleBuffering = new TraceSwitch("DoubleBuffering", "Output information about double buffering");
}
return doubleBuffering;
}
}
///
/// Allows you to set the maximum width and height of the buffer that will be retained in memory.
/// You can allocate a buffer of any size, however any request for a buffer that would have a total
/// memory footprint larger that the maximum size will be allocated temporarily and then discarded
/// with the BufferedGraphics is released.
///
public Size MaximumBuffer {
get {
return maximumBuffer;
}
[UIPermission(SecurityAction.Demand, Window=UIPermissionWindow.AllWindows)]
set {
if (value.Width <= 0 || value.Height <= 0) {
throw new ArgumentException(SR.GetString(SR.InvalidArgument, "MaximumBuffer", value));
}
//if we've been asked to decrease the size of the maximum buffer,
//then invalidate the older & larger buffer
//
if (value.Width * value.Height < maximumBuffer.Width * maximumBuffer.Height) {
Invalidate();
}
maximumBuffer = value;
}
}
///
/// Returns a BufferedGraphics that is matched for the specified target Graphics object.
///
[ResourceExposure(ResourceScope.Process)]
[ResourceConsumption(ResourceScope.Process)]
public BufferedGraphics Allocate(Graphics targetGraphics, Rectangle targetRectangle) {
if (ShouldUseTempManager(targetRectangle)) {
Debug.WriteLineIf(DoubleBuffering.TraceWarning, "Too big of buffer requested (" + targetRectangle.Width + " x " + targetRectangle.Height + ") ... allocating temp buffer manager");
return AllocBufferInTempManager(targetGraphics, IntPtr.Zero, targetRectangle);
}
return AllocBuffer(targetGraphics, IntPtr.Zero, targetRectangle);
}
///
/// Returns a BufferedGraphics that is matched for the specified target HDC object.
///
[SecurityPermission(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.UnmanagedCode)]
[ResourceExposure(ResourceScope.Process)]
[ResourceConsumption(ResourceScope.Process)]
public BufferedGraphics Allocate(IntPtr targetDC, Rectangle targetRectangle) {
if (ShouldUseTempManager(targetRectangle)) {
Debug.WriteLineIf(DoubleBuffering.TraceWarning, "Too big of buffer requested (" + targetRectangle.Width + " x " + targetRectangle.Height + ") ... allocating temp buffer manager");
return AllocBufferInTempManager(null, targetDC, targetRectangle);
}
return AllocBuffer(null, targetDC, targetRectangle);
}
///
/// Returns a BufferedGraphics that is matched for the specified target HDC object.
///
[ResourceExposure(ResourceScope.Process)]
[ResourceConsumption(ResourceScope.Process)]
private BufferedGraphics AllocBuffer(Graphics targetGraphics, IntPtr targetDC, Rectangle targetRectangle) {
int oldBusy = Interlocked.CompareExchange(ref busy, BUFFER_BUSY_PAINTING, BUFFER_FREE);
// In the case were we have contention on the buffer - i.e. two threads
// trying to use the buffer at the same time, we just create a temp
// buffermanager and have the buffer dispose of it when it is done.
//
if (oldBusy != BUFFER_FREE) {
Debug.WriteLineIf(DoubleBuffering.TraceWarning, "Attempt to have two buffers for a buffer manager... allocating temp buffer manager");
return AllocBufferInTempManager(targetGraphics, targetDC, targetRectangle);
}
#if DEBUG
if (DoubleBuffering.TraceVerbose) {
stackAtBusy = new StackTrace().ToString();
}
#endif
Graphics surface;
this.targetLoc = new Point(targetRectangle.X, targetRectangle.Y);
try {
if (targetGraphics != null) {
IntPtr destDc = targetGraphics.GetHdc();
try {
surface = CreateBuffer(destDc, -targetLoc.X, -targetLoc.Y, targetRectangle.Width, targetRectangle.Height);
}
finally {
targetGraphics.ReleaseHdcInternal(destDc);
}
}
else {
surface = CreateBuffer(targetDC, -targetLoc.X, -targetLoc.Y, targetRectangle.Width, targetRectangle.Height);
}
this.buffer = new BufferedGraphics(surface, this, targetGraphics, targetDC, targetLoc, virtualSize);
}
catch {
this.busy = BUFFER_FREE; // free the buffer so it can be disposed.
throw;
}
return this.buffer;
}
///
/// Returns a BufferedGraphics that is matched for the specified target HDC object.
///
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Reliability", "CA2000:DisposeObjectsBeforeLosingScope")]
[ResourceExposure(ResourceScope.Process)]
[ResourceConsumption(ResourceScope.Process)]
private BufferedGraphics AllocBufferInTempManager(Graphics targetGraphics, IntPtr targetDC, Rectangle targetRectangle) {
BufferedGraphicsContext tempContext = null;
BufferedGraphics tempBuffer = null;
try {
tempContext = new BufferedGraphicsContext();
if (tempContext != null) {
tempBuffer = tempContext.AllocBuffer(targetGraphics, targetDC, targetRectangle);
tempBuffer.DisposeContext = true;
}
}
finally {
if (tempContext != null && (tempBuffer == null || (tempBuffer != null && !tempBuffer.DisposeContext))) {
tempContext.Dispose();
}
}
return tempBuffer;
}
///
// bFillBitmapInfo
//
// Fills in the fields of a BITMAPINFO so that we can create a bitmap
// that matches the format of the display.
//
// This is done by creating a compatible bitmap and calling GetDIBits
// to return the color masks. This is done with two calls. The first
// call passes in biBitCount = 0 to GetDIBits which will fill in the
// base BITMAPINFOHEADER data. The second call to GetDIBits (passing
// in the BITMAPINFO filled in by the first call) will return the color
// table or bitmasks, as appropriate.
//
// Returns:
// TRUE if successful, FALSE otherwise.
//
// History:
// 07-Jun-1995 -by- Gilman Wong [[....]]
// Wrote it.
//
// 15-Nov-2000 -by- Chris Anderson [[....]]
// Ported it to C#
//
///
[ResourceExposure(ResourceScope.None)]
[ResourceConsumption(ResourceScope.Process, ResourceScope.Process)]
private bool bFillBitmapInfo(IntPtr hdc, IntPtr hpal, ref NativeMethods.BITMAPINFO_FLAT pbmi) {
IntPtr hbm = IntPtr.Zero;
bool bRet = false;
try {
//
// Create a dummy bitmap from which we can query color format info
// about the device surface.
//
hbm = SafeNativeMethods.CreateCompatibleBitmap(new HandleRef(null, hdc), 1, 1);
if (hbm == IntPtr.Zero) {
throw new OutOfMemoryException(SR.GetString(SR.GraphicsBufferQueryFail));
}
pbmi.bmiHeader_biSize = Marshal.SizeOf(typeof(NativeMethods.BITMAPINFOHEADER));
pbmi.bmiColors = new byte[NativeMethods.BITMAPINFO_MAX_COLORSIZE*4];
//
// Call first time to fill in BITMAPINFO header.
//
SafeNativeMethods.GetDIBits(new HandleRef(null, hdc),
new HandleRef(null, hbm),
0,
0,
IntPtr.Zero,
ref pbmi,
NativeMethods.DIB_RGB_COLORS);
if ( pbmi.bmiHeader_biBitCount <= 8 ) {
bRet = bFillColorTable(hdc, hpal, ref pbmi);
}
else {
if ( pbmi.bmiHeader_biCompression == NativeMethods.BI_BITFIELDS ) {
//
// Call a second time to get the color masks.
// It's a GetDIBits Win32 "feature".
//
SafeNativeMethods.GetDIBits(new HandleRef(null, hdc),
new HandleRef(null, hbm),
0,
pbmi.bmiHeader_biHeight,
IntPtr.Zero,
ref pbmi,
NativeMethods.DIB_RGB_COLORS);
}
bRet = true;
}
}
finally {
if (hbm != IntPtr.Zero) {
SafeNativeMethods.DeleteObject(new HandleRef(null, hbm));
hbm = IntPtr.Zero;
}
}
return bRet;
}
///
// bFillColorTable
//
// Initialize the color table of the BITMAPINFO pointed to by pbmi. Colors
// are set to the current system palette.
//
// Note: call only valid for displays of 8bpp or less.
//
// Returns:
// TRUE if successful, FALSE otherwise.
//
// History:
// 23-Jan-1996 -by- Gilman Wong [[....]]
// Wrote it.
//
// 15-Nov-2000 -by- Chris Anderson [[....]]
// Ported it to C#
//
///
private unsafe bool bFillColorTable(IntPtr hdc, IntPtr hpal, ref NativeMethods.BITMAPINFO_FLAT pbmi) {
bool bRet = false;
byte[] aj = new byte[sizeof(NativeMethods.PALETTEENTRY) * 256];
int i, cColors;
fixed (byte* pcolors = pbmi.bmiColors) {
fixed (byte* ppal = aj) {
NativeMethods.RGBQUAD* prgb = (NativeMethods.RGBQUAD*)pcolors;
NativeMethods.PALETTEENTRY* lppe = (NativeMethods.PALETTEENTRY*)ppal;
cColors = 1 << pbmi.bmiHeader_biBitCount;
if ( cColors <= 256 ) {
Debug.WriteLineIf(DoubleBuffering.TraceVerbose, "8 bit or less...");
// NOTE : Didn't port "MyGetPaletteEntries" as it is only
// : for 4bpp displays, which we don't work on anyway.
uint palRet;
IntPtr palHalftone = IntPtr.Zero;
if (hpal == IntPtr.Zero) {
Debug.WriteLineIf(DoubleBuffering.TraceVerbose, "using halftone palette...");
palHalftone = Graphics.GetHalftonePalette();
palRet = SafeNativeMethods.GetPaletteEntries(new HandleRef(null, palHalftone), 0, cColors, aj);
}
else {
Debug.WriteLineIf(DoubleBuffering.TraceVerbose, "using custom palette...");
palRet = SafeNativeMethods.GetPaletteEntries(new HandleRef(null, hpal), 0, cColors, aj);
}
if ( palRet != 0 ) {
for (i = 0; i < cColors; i++) {
prgb[i].rgbRed = lppe[i].peRed;
prgb[i].rgbGreen = lppe[i].peGreen;
prgb[i].rgbBlue = lppe[i].peBlue;
prgb[i].rgbReserved = 0;
}
bRet = true;
}
else {
Debug.WriteLineIf(DoubleBuffering.TraceWarning, "bFillColorTable: MyGetSystemPaletteEntries failed\n");
}
}
}
}
return bRet;
}
///
/// Returns a Graphics object representing a buffer.
///
[ResourceExposure(ResourceScope.Process)]
[ResourceConsumption(ResourceScope.Process)]
private Graphics CreateBuffer(IntPtr src, int offsetX, int offsetY, int width, int height)
{
//create the compat DC
busy = BUFFER_BUSY_DISPOSING;
DisposeDC();
busy = BUFFER_BUSY_PAINTING;
compatDC = UnsafeNativeMethods.CreateCompatibleDC(new HandleRef(null, src));
//recreate the bitmap if necessary
if (width > bufferSize.Width || height > bufferSize.Height)
{
Debug.WriteLineIf(DoubleBuffering.TraceInfo, "allocating new bitmap: " + width + " x " + height);
int optWidth = Math.Max(width, bufferSize.Width);
int optHeight = Math.Max(height, bufferSize.Height);
busy = BUFFER_BUSY_DISPOSING;
DisposeBitmap();
busy = BUFFER_BUSY_PAINTING;
Debug.WriteLineIf(DoubleBuffering.TraceInfo, " new size : " + optWidth + " x " + optHeight);
IntPtr pvbits = IntPtr.Zero;
dib = CreateCompatibleDIB(src, IntPtr.Zero, optWidth, optHeight, ref pvbits);
bufferSize = new Size(optWidth, optHeight);
}
//select the bitmap
oldBitmap = SafeNativeMethods.SelectObject(new HandleRef(this, compatDC), new HandleRef(this, dib));
//create compat graphics
Debug.WriteLineIf(DoubleBuffering.TraceInfo, " Create compatGraphics");
compatGraphics = Graphics.FromHdcInternal(compatDC);
compatGraphics.TranslateTransform(-targetLoc.X, -targetLoc.Y);
virtualSize = new Size(width, height);
return compatGraphics;
}
///
// CreateCompatibleDIB
//
// Create a DIB section with an optimal format w.r.t. the specified hdc.
//
// If DIB <= 8bpp, then the DIB color table is initialized based on the
// specified palette. If the palette handle is NULL, then the system
// palette is used.
//
// Note: The hdc must be a direct DC (not an info or memory DC).
//
// Note: On palettized displays, if the system palette changes the
// UpdateDIBColorTable function should be called to maintain
// the identity palette mapping between the DIB and the display.
//
// Returns:
// Valid bitmap handle if successful, NULL if error.
//
// History:
// 23-Jan-1996 -by- Gilman Wong [[....]]
// Wrote it.
//
// 15-Nov-2000 -by- Chris Anderson [[....]]
// Ported it to C#.
//
///
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Interoperability", "CA1404:CallGetLastErrorImmediatelyAfterPInvoke")]
private IntPtr CreateCompatibleDIB(IntPtr hdc, IntPtr hpal, int ulWidth, int ulHeight, ref IntPtr ppvBits) {
if (hdc == IntPtr.Zero) {
throw new ArgumentNullException("hdc");
}
IntPtr hbmRet = IntPtr.Zero;
NativeMethods.BITMAPINFO_FLAT pbmi = new NativeMethods.BITMAPINFO_FLAT();
//
// Validate hdc.
//
int objType = UnsafeNativeMethods.GetObjectType(new HandleRef(null, hdc));
switch(objType) {
case NativeMethods.OBJ_DC:
case NativeMethods.OBJ_METADC:
case NativeMethods.OBJ_MEMDC:
case NativeMethods.OBJ_ENHMETADC:
break;
default:
throw new ArgumentException(SR.GetString(SR.DCTypeInvalid));
}
if (bFillBitmapInfo(hdc, hpal, ref pbmi)) {
//
// Change bitmap size to match specified dimensions.
//
pbmi.bmiHeader_biWidth = ulWidth;
pbmi.bmiHeader_biHeight = ulHeight;
if (pbmi.bmiHeader_biCompression == NativeMethods.BI_RGB) {
pbmi.bmiHeader_biSizeImage = 0;
}
else {
if ( pbmi.bmiHeader_biBitCount == 16 )
pbmi.bmiHeader_biSizeImage = ulWidth * ulHeight * 2;
else if ( pbmi.bmiHeader_biBitCount == 32 )
pbmi.bmiHeader_biSizeImage = ulWidth * ulHeight * 4;
else
pbmi.bmiHeader_biSizeImage = 0;
}
pbmi.bmiHeader_biClrUsed = 0;
pbmi.bmiHeader_biClrImportant = 0;
//
// Create the DIB section. Let Win32 allocate the memory and return
// a pointer to the bitmap surface.
//
hbmRet = SafeNativeMethods.CreateDIBSection(new HandleRef(null, hdc), ref pbmi, NativeMethods.DIB_RGB_COLORS, ref ppvBits, IntPtr.Zero, 0);
Win32Exception ex = null;
if ( hbmRet == IntPtr.Zero ) {
ex = new Win32Exception(Marshal.GetLastWin32Error());
#if DEBUG
DumpBitmapInfo(ref pbmi);
#endif
}
#if DEBUG
if (DoubleBuffering.TraceVerbose) {
DumpBitmapInfo(ref pbmi);
}
#endif
if(ex!=null) {
throw ex;
}
}
return hbmRet;
}
///
/// Disposes of native handles.
///
public void Dispose() {
Dispose(true);
GC.SuppressFinalize(this);
}
///
/// Disposes the DC, but leaves the bitmap alone.
///
[ResourceExposure(ResourceScope.None)]
[ResourceConsumption(ResourceScope.Process, ResourceScope.Process)]
private void DisposeDC()
{
if (oldBitmap != IntPtr.Zero && compatDC != IntPtr.Zero)
{
Debug.WriteLineIf(DoubleBuffering.TraceVerbose, "restoring bitmap to DC");
SafeNativeMethods.SelectObject(new HandleRef(this, compatDC), new HandleRef(this, oldBitmap));
oldBitmap = IntPtr.Zero;
}
if (compatDC != IntPtr.Zero)
{
Debug.WriteLineIf(DoubleBuffering.TraceVerbose, "delete compat DC");
UnsafeNativeMethods.DeleteDC(new HandleRef(this, compatDC));
compatDC = IntPtr.Zero;
}
}
///
/// Disposes the bitmap, will ASSERT if bitmap is being used (checks oldbitmap).
/// if ASSERTed, call DisposeDC() first.
///
private void DisposeBitmap()
{
if (dib != IntPtr.Zero)
{
Debug.Assert(oldBitmap == IntPtr.Zero);
Debug.WriteLineIf(DoubleBuffering.TraceVerbose, "delete dib");
SafeNativeMethods.DeleteObject(new HandleRef(this, dib));
dib = IntPtr.Zero;
}
}
///
/// Disposes of the Graphics buffer.
///
private void Dispose(bool disposing) {
Debug.WriteLineIf(DoubleBuffering.TraceInfo, "Dispose(" + disposing + ") {");
Debug.Indent();
int oldBusy = Interlocked.CompareExchange(ref busy, BUFFER_BUSY_DISPOSING, BUFFER_FREE);
if(disposing){
if (oldBusy == BUFFER_BUSY_PAINTING) {
#if DEBUG
Debug.WriteLineIf(DoubleBuffering.TraceInfo, "Stack at busy buffer: \n" + stackAtBusy);
#endif
throw new InvalidOperationException(SR.GetString(SR.GraphicsBufferCurrentlyBusy));
}
if (compatGraphics != null) {
Debug.WriteLineIf(DoubleBuffering.TraceVerbose, "Disposing compatGraphics");
compatGraphics.Dispose();
compatGraphics = null;
}
}
else{
Debug.Fail("Never let a graphics buffer finalize!");
}
DisposeDC();
DisposeBitmap();
if (buffer != null) {
Debug.WriteLineIf(DoubleBuffering.TraceVerbose, "Disposing buffer");
buffer.Dispose();
buffer = null;
}
bufferSize = Size.Empty;
virtualSize = Size.Empty;
Debug.Unindent();
Debug.WriteLineIf(DoubleBuffering.TraceInfo, "}");
this.busy = BUFFER_FREE;
}
#if DEBUG
private void DumpBitmapInfo(ref NativeMethods.BITMAPINFO_FLAT pbmi) {
//Debug.WriteLine("biSize --> " + pbmi.bmiHeader_biSize);
Debug.WriteLine("biWidth --> " + pbmi.bmiHeader_biWidth);
Debug.WriteLine("biHeight --> " + pbmi.bmiHeader_biHeight);
Debug.WriteLine("biPlanes --> " + pbmi.bmiHeader_biPlanes);
Debug.WriteLine("biBitCount --> " + pbmi.bmiHeader_biBitCount);
//Debug.WriteLine("biCompression --> " + pbmi.bmiHeader_biCompression);
//Debug.WriteLine("biSizeImage --> " + pbmi.bmiHeader_biSizeImage);
//Debug.WriteLine("biXPelsPerMeter --> " + pbmi.bmiHeader_biXPelsPerMeter);
//Debug.WriteLine("biYPelsPerMeter --> " + pbmi.bmiHeader_biYPelsPerMeter);
//Debug.WriteLine("biClrUsed --> " + pbmi.bmiHeader_biClrUsed);
//Debug.WriteLine("biClrImportant --> " + pbmi.bmiHeader_biClrImportant);
//Debug.Write("bmiColors --> ");
//for (int i=0; i
/// Invalidates the cached graphics buffer.
///
public void Invalidate() {
int oldBusy = Interlocked.CompareExchange(ref busy, BUFFER_BUSY_DISPOSING, BUFFER_FREE);
//if we're not busy with our buffer, lets
//clean it up now
//
if (oldBusy == BUFFER_FREE) {
Dispose();
this.busy = BUFFER_FREE;
}
else {
//this will indicate to free the buffer
//as soon as it becomes non-busy
//
this.invalidateWhenFree = true;
}
}
///
/// Returns a Graphics object representing a buffer.
///
internal void ReleaseBuffer(BufferedGraphics buffer) {
Debug.Assert(buffer == this.buffer, "Tried to release a bogus buffer");
this.buffer = null;
if (this.invalidateWhenFree) {
this.busy = BUFFER_BUSY_DISPOSING;
Dispose(); //clears everything (incl bitmap)
}
else { //otherwise, just dispose the DC. A new one will be created next time.
this.busy = BUFFER_BUSY_DISPOSING;
DisposeDC(); //only clears out the DC
}
this.busy = BUFFER_FREE;
}
///
/// This routine allows us to control the point were we start using throw away
/// managers for painting. Since the buffer manager stays around (by default)
/// for the life of the app, we don't want to consume too much memory
/// in the buffer. However, re-allocating the buffer for small things (like
/// buttons, labels, etc) will hit us on runtime performance.
///
private bool ShouldUseTempManager(Rectangle targetBounds) {
return (targetBounds.Width * targetBounds.Height) > (MaximumBuffer.Width * MaximumBuffer.Height);
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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