public virtual long CopyTo(UnsafeNativeMethods.IStream pstm, long cb, long[] pcbRead) {
int bufsize = 4096; // one page
IntPtr buffer = Marshal.AllocHGlobal(bufsize);
if (buffer == IntPtr.Zero) throw new OutOfMemoryException();
long written = 0;
try {
while (written < cb) {
int toRead = bufsize;
if (written + toRead > cb) toRead = (int) (cb - written);
int read = Read(buffer, toRead);
if (read == 0) break;
if (pstm.Write(buffer, read) != read) {
throw EFail("Wrote an incorrect number of bytes");
}
written += read;
}
}
finally {
Marshal.FreeHGlobal(buffer);
}
if (pcbRead != null && pcbRead.Length > 0) {
pcbRead[0] = written;
}
return written;
}
public void Dispose()
{
UnsafeNativeMethods.ReleaseDC(NativeMethods.NullHandleRef, new HandleRef(null, _handle));
}
internal static extern int GdipSaveImageToStream(HandleRef image, UnsafeNativeMethods.IStream stream, ref Guid classId, HandleRef encoderParams);
/// <include file='doc\Icon.uex' path='docs/doc[@for="Icon.Initialize"]/*' />
/// <devdoc>
/// Initializes this Image object. This is identical to calling the image's
/// constructor with picture, but this allows non-constructor initialization,
/// which may be necessary in some instances.
/// </devdoc>
private unsafe void Initialize(int width, int height)
{
if (iconData == null || handle != IntPtr.Zero)
{
throw new InvalidOperationException(SR.GetString(SR.IllegalState, GetType().Name));
}
if (iconData.Length < Marshal.SizeOf(typeof(SafeNativeMethods.ICONDIR)))
{
throw new ArgumentException(SR.GetString(SR.InvalidPictureType, "picture", "Icon"));
}
// Get the correct width / height
//
if (width == 0)
{
width = UnsafeNativeMethods.GetSystemMetrics(SafeNativeMethods.SM_CXICON);
}
if (height == 0)
{
height = UnsafeNativeMethods.GetSystemMetrics(SafeNativeMethods.SM_CYICON);
}
if (bitDepth == 0)
{
IntPtr dc = UnsafeNativeMethods.GetDC(NativeMethods.NullHandleRef);
bitDepth = UnsafeNativeMethods.GetDeviceCaps(new HandleRef(null, dc), SafeNativeMethods.BITSPIXEL);
bitDepth *= UnsafeNativeMethods.GetDeviceCaps(new HandleRef(null, dc), SafeNativeMethods.PLANES);
UnsafeNativeMethods.ReleaseDC(NativeMethods.NullHandleRef, new HandleRef(null, dc));
// If the bitdepth is 8, make it 4. Why? Because windows does not
// choose a 256 color icon if the display is running in 256 color mode
// because of palette flicker.
//
if (bitDepth == 8)
{
bitDepth = 4;
}
}
fixed(byte *pbIconData = iconData)
{
SafeNativeMethods.ICONDIR *pIconDir = (SafeNativeMethods.ICONDIR *)pbIconData;
if (pIconDir->idReserved != 0 || pIconDir->idType != 1 || pIconDir->idCount == 0)
{
throw new ArgumentException(SR.GetString(SR.InvalidPictureType, "picture", "Icon"));
}
SafeNativeMethods.ICONDIRENTRY *pIconDirEntry = &pIconDir->idEntries;
SafeNativeMethods.ICONDIRENTRY *pBestFit = null;
int bestBitDepth = 0;
int icondirEntrySize = Marshal.SizeOf(typeof(SafeNativeMethods.ICONDIRENTRY));
Debug.Assert((icondirEntrySize * pIconDir->idCount) < iconData.Length, "Illegal number of ICONDIRENTRIES");
if ((icondirEntrySize * pIconDir->idCount) >= iconData.Length)
{
throw new ArgumentException(SR.GetString(SR.InvalidPictureType, "picture", "Icon"));
}
for (int i = 0; i < pIconDir->idCount; i++)
{
int iconBitDepth = pIconDirEntry->wPlanes * pIconDirEntry->wBitCount;
if (iconBitDepth == 0)
{
if (pIconDirEntry->bColorCount == 0)
{
iconBitDepth = 16;
}
else
{
iconBitDepth = 8;
if (pIconDirEntry->bColorCount < 0xFF)
{
iconBitDepth = 4;
}
if (pIconDirEntry->bColorCount < 0x10)
{
iconBitDepth = 2;
}
}
}
// Windows rules for specifing an icon:
//
// 1. The icon with the closest size match.
// 2. For matching sizes, the image with the closest bit depth.
// 3. If there is no color depth match, the icon with the closest color depth that does not exceed the display.
// 4. If all icon color depth > display, lowest color depth is chosen.
// 5. color depth of > 8bpp are all equal.
// 6. Never choose an 8bpp icon on an 8bpp system.
//
if (pBestFit == null)
{
pBestFit = pIconDirEntry;
bestBitDepth = iconBitDepth;
}
else
{
int bestDelta = Math.Abs(pBestFit->bWidth - width) + Math.Abs(pBestFit->bHeight - height);
int thisDelta = Math.Abs(pIconDirEntry->bWidth - width) + Math.Abs(pIconDirEntry->bHeight - height);
if (thisDelta < bestDelta)
{
pBestFit = pIconDirEntry;
bestBitDepth = iconBitDepth;
}
else if (thisDelta == bestDelta && (iconBitDepth <= bitDepth && iconBitDepth > bestBitDepth || bestBitDepth > bitDepth && iconBitDepth < bestBitDepth))
{
pBestFit = pIconDirEntry;
bestBitDepth = iconBitDepth;
}
}
pIconDirEntry++;
}
Debug.Assert(pBestFit->dwImageOffset >= 0 && (pBestFit->dwImageOffset + pBestFit->dwBytesInRes) <= iconData.Length, "Illegal offset/length for the Icon data");
if (pBestFit->dwImageOffset < 0 || (pBestFit->dwImageOffset + pBestFit->dwBytesInRes) > iconData.Length)
{
throw new ArgumentException(SR.GetString(SR.InvalidPictureType, "picture", "Icon"));
}
handle = SafeNativeMethods.CreateIconFromResourceEx(pbIconData + pBestFit->dwImageOffset, pBestFit->dwBytesInRes, true, 0x00030000, 0, 0, 0);
if (handle == IntPtr.Zero)
{
throw new Win32Exception();
}
}
}
internal static extern int GdipLoadImageFromStreamICM(UnsafeNativeMethods.IStream stream, out IntPtr image);
internal static extern int GdipRecordMetafileStreamI(UnsafeNativeMethods.IStream stream, HandleRef referenceHdc, int emfType, ref GPRECT frameRect, int frameUnit, string description, out IntPtr metafile);
internal static extern int GdipGetMetafileHeaderFromStream(UnsafeNativeMethods.IStream stream, IntPtr header);
internal static extern int GdipCreateMetafileFromStream(UnsafeNativeMethods.IStream stream, out IntPtr metafile);
internal static extern int GdipCreateBitmapFromStreamICM(UnsafeNativeMethods.IStream stream, out IntPtr bitmap);
// Initializes this Image object. This is identical to calling the image's
// constructor with picture, but this allows non-constructor initialization,
// which may be necessary in some instances.
private unsafe void Initialize(int width, int height)
{
if (_iconData == null || _handle != IntPtr.Zero)
{
throw new InvalidOperationException(SR.Format(SR.IllegalState, GetType().Name));
}
if (_iconData.Length < sizeof(SafeNativeMethods.ICONDIR))
{
throw new ArgumentException(SR.Format(SR.InvalidPictureType, "picture", nameof(Icon)));
}
// Get the correct width and height.
if (width == 0)
{
width = UnsafeNativeMethods.GetSystemMetrics(SafeNativeMethods.SM_CXICON);
}
if (height == 0)
{
height = UnsafeNativeMethods.GetSystemMetrics(SafeNativeMethods.SM_CYICON);
}
if (s_bitDepth == 0)
{
IntPtr dc = Interop.User32.GetDC(IntPtr.Zero);
s_bitDepth = Interop.Gdi32.GetDeviceCaps(dc, Interop.Gdi32.DeviceCapability.BITSPIXEL);
s_bitDepth *= Interop.Gdi32.GetDeviceCaps(dc, Interop.Gdi32.DeviceCapability.PLANES);
Interop.User32.ReleaseDC(IntPtr.Zero, dc);
// If the bitdepth is 8, make it 4 because windows does not
// choose a 256 color icon if the display is running in 256 color mode
// due to palette flicker.
if (s_bitDepth == 8)
{
s_bitDepth = 4;
}
}
fixed(byte *b = _iconData)
{
SafeNativeMethods.ICONDIR *dir = (SafeNativeMethods.ICONDIR *)b;
if (dir->idReserved != 0 || dir->idType != 1 || dir->idCount == 0)
{
throw new ArgumentException(SR.Format(SR.InvalidPictureType, "picture", nameof(Icon)));
}
byte bestWidth = 0;
byte bestHeight = 0;
if (sizeof(SafeNativeMethods.ICONDIRENTRY) * (dir->idCount - 1) + sizeof(SafeNativeMethods.ICONDIR)
> _iconData.Length)
{
throw new ArgumentException(SR.Format(SR.InvalidPictureType, "picture", nameof(Icon)));
}
var entries = new ReadOnlySpan <SafeNativeMethods.ICONDIRENTRY>(&dir->idEntries, dir->idCount);
foreach (SafeNativeMethods.ICONDIRENTRY entry in entries)
{
bool fUpdateBestFit = false;
uint iconBitDepth;
if (entry.bColorCount != 0)
{
iconBitDepth = 4;
if (entry.bColorCount < 0x10)
{
iconBitDepth = 1;
}
}
else
{
iconBitDepth = entry.wBitCount;
}
// If it looks like if nothing is specified at this point then set the bits per pixel to 8.
if (iconBitDepth == 0)
{
iconBitDepth = 8;
}
// Windows rules for specifing an icon:
//
// 1. The icon with the closest size match.
// 2. For matching sizes, the image with the closest bit depth.
// 3. If there is no color depth match, the icon with the closest color depth that does not exceed the display.
// 4. If all icon color depth > display, lowest color depth is chosen.
// 5. color depth of > 8bpp are all equal.
// 6. Never choose an 8bpp icon on an 8bpp system.
if (_bestBytesInRes == 0)
{
fUpdateBestFit = true;
}
else
{
int bestDelta = Math.Abs(bestWidth - width) + Math.Abs(bestHeight - height);
int thisDelta = Math.Abs(entry.bWidth - width) + Math.Abs(entry.bHeight - height);
if ((thisDelta < bestDelta) ||
(thisDelta == bestDelta && (iconBitDepth <= s_bitDepth && iconBitDepth > _bestBitDepth || _bestBitDepth > s_bitDepth && iconBitDepth < _bestBitDepth)))
{
fUpdateBestFit = true;
}
}
if (fUpdateBestFit)
{
bestWidth = entry.bWidth;
bestHeight = entry.bHeight;
_bestImageOffset = entry.dwImageOffset;
_bestBytesInRes = entry.dwBytesInRes;
_bestBitDepth = iconBitDepth;
}
}
if (_bestImageOffset > int.MaxValue)
{
throw new ArgumentException(SR.Format(SR.InvalidPictureType, "picture", nameof(Icon)));
}
if (_bestBytesInRes > int.MaxValue)
{
throw new Win32Exception(SafeNativeMethods.ERROR_INVALID_PARAMETER);
}
uint endOffset;
try
{
endOffset = checked (_bestImageOffset + _bestBytesInRes);
}
catch (OverflowException)
{
throw new Win32Exception(SafeNativeMethods.ERROR_INVALID_PARAMETER);
}
if (endOffset > _iconData.Length)
{
throw new ArgumentException(SR.Format(SR.InvalidPictureType, "picture", nameof(Icon)));
}
// Copy the bytes into an aligned buffer if needed.
if ((_bestImageOffset % IntPtr.Size) != 0)
{
// Beginning of icon's content is misaligned.
byte[] alignedBuffer = ArrayPool <byte> .Shared.Rent((int)_bestBytesInRes);
Array.Copy(_iconData, _bestImageOffset, alignedBuffer, 0, _bestBytesInRes);
fixed(byte *pbAlignedBuffer = alignedBuffer)
{
_handle = SafeNativeMethods.CreateIconFromResourceEx(pbAlignedBuffer, _bestBytesInRes, true, 0x00030000, 0, 0, 0);
}
ArrayPool <byte> .Shared.Return(alignedBuffer);
}
else
{
try
{
_handle = SafeNativeMethods.CreateIconFromResourceEx(checked (b + _bestImageOffset), _bestBytesInRes, true, 0x00030000, 0, 0, 0);
}
catch (OverflowException)
{
throw new Win32Exception(SafeNativeMethods.ERROR_INVALID_PARAMETER);
}
}
if (_handle == IntPtr.Zero)
{
throw new Win32Exception();
}
}
}
/// <include file='doc\Icon.uex' path='docs/doc[@for="Icon.Initialize"]/*' />
/// <devdoc>
/// Initializes this Image object. This is identical to calling the image's
/// constructor with picture, but this allows non-constructor initialization,
/// which may be necessary in some instances.
/// </devdoc>
private unsafe void Initialize(int width, int height)
{
if (_iconData == null || _handle != IntPtr.Zero)
{
throw new InvalidOperationException(SR.Format(SR.IllegalState, GetType().Name));
}
int icondirSize = Marshal.SizeOf(typeof(SafeNativeMethods.ICONDIR));
if (_iconData.Length < icondirSize)
{
throw new ArgumentException(SR.Format(SR.InvalidPictureType, "picture", "Icon"));
}
// Get the correct width / height
//
if (width == 0)
{
width = UnsafeNativeMethods.GetSystemMetrics(SafeNativeMethods.SM_CXICON);
}
if (height == 0)
{
height = UnsafeNativeMethods.GetSystemMetrics(SafeNativeMethods.SM_CYICON);
}
if (s_bitDepth == 0)
{
IntPtr dc = UnsafeNativeMethods.GetDC(NativeMethods.NullHandleRef);
s_bitDepth = UnsafeNativeMethods.GetDeviceCaps(new HandleRef(null, dc), SafeNativeMethods.BITSPIXEL);
s_bitDepth *= UnsafeNativeMethods.GetDeviceCaps(new HandleRef(null, dc), SafeNativeMethods.PLANES);
UnsafeNativeMethods.ReleaseDC(NativeMethods.NullHandleRef, new HandleRef(null, dc));
// If the bitdepth is 8, make it 4. Why? Because windows does not
// choose a 256 color icon if the display is running in 256 color mode
// because of palette flicker.
//
if (s_bitDepth == 8)
{
s_bitDepth = 4;
}
}
fixed(byte *pbIconData = _iconData)
{
short idReserved = GetShort(pbIconData);
short idType = GetShort(pbIconData + 2);
short idCount = GetShort(pbIconData + 4);
if (idReserved != 0 || idType != 1 || idCount == 0)
{
throw new ArgumentException(SR.Format(SR.InvalidPictureType, "picture", "Icon"));
}
SafeNativeMethods.ICONDIRENTRY EntryTemp;
byte bestWidth = 0;
byte bestHeight = 0;
//int bestBitDepth = 0;
byte *pbIconDirEntry = unchecked (pbIconData + 6);
int icondirEntrySize = Marshal.SizeOf(typeof(SafeNativeMethods.ICONDIRENTRY));
if ((icondirEntrySize * (idCount - 1) + icondirSize) > _iconData.Length)
{
throw new ArgumentException(SR.Format(SR.InvalidPictureType, "picture", "Icon"));
}
for (int i = 0; i < idCount; i++)
{
//
// Fill in EntryTemp
//
EntryTemp.bWidth = pbIconDirEntry[0];
EntryTemp.bHeight = pbIconDirEntry[1];
EntryTemp.bColorCount = pbIconDirEntry[2];
EntryTemp.bReserved = pbIconDirEntry[3];
EntryTemp.wPlanes = GetShort(pbIconDirEntry + 4);
EntryTemp.wBitCount = GetShort(pbIconDirEntry + 6);
EntryTemp.dwBytesInRes = GetInt(pbIconDirEntry + 8);
EntryTemp.dwImageOffset = GetInt(pbIconDirEntry + 12);
//
//
//
bool fUpdateBestFit = false;
int iconBitDepth = 0;
if (EntryTemp.bColorCount != 0)
{
iconBitDepth = 4;
if (EntryTemp.bColorCount < 0x10)
{
iconBitDepth = 1;
}
}
else
{
iconBitDepth = EntryTemp.wBitCount;
}
// it looks like if nothing is specified at this point, bpp is 8...
if (iconBitDepth == 0)
{
iconBitDepth = 8;
}
// Windows rules for specifing an icon:
//
// 1. The icon with the closest size match.
// 2. For matching sizes, the image with the closest bit depth.
// 3. If there is no color depth match, the icon with the closest color depth that does not exceed the display.
// 4. If all icon color depth > display, lowest color depth is chosen.
// 5. color depth of > 8bpp are all equal.
// 6. Never choose an 8bpp icon on an 8bpp system.
//
if (0 == _bestBytesInRes)
{
fUpdateBestFit = true;
}
else
{
int bestDelta = Math.Abs(bestWidth - width) + Math.Abs(bestHeight - height);
int thisDelta = Math.Abs(EntryTemp.bWidth - width) + Math.Abs(EntryTemp.bHeight - height);
if ((thisDelta < bestDelta) ||
(thisDelta == bestDelta && (iconBitDepth <= s_bitDepth && iconBitDepth > _bestBitDepth || _bestBitDepth > s_bitDepth && iconBitDepth < _bestBitDepth)))
{
fUpdateBestFit = true;
}
}
if (fUpdateBestFit)
{
bestWidth = EntryTemp.bWidth;
bestHeight = EntryTemp.bHeight;
_bestImageOffset = EntryTemp.dwImageOffset;
_bestBytesInRes = EntryTemp.dwBytesInRes;
_bestBitDepth = iconBitDepth;
}
pbIconDirEntry += icondirEntrySize;
}
if (_bestImageOffset < 0)
{
throw new ArgumentException(SR.Format(SR.InvalidPictureType, "picture", "Icon"));
}
if (_bestBytesInRes < 0)
{
throw new Win32Exception(SafeNativeMethods.ERROR_INVALID_PARAMETER);
}
int endOffset;
try
{
endOffset = checked (_bestImageOffset + _bestBytesInRes);
}
catch (OverflowException)
{
throw new Win32Exception(SafeNativeMethods.ERROR_INVALID_PARAMETER);
}
if (endOffset > _iconData.Length)
{
throw new ArgumentException(SR.Format(SR.InvalidPictureType, "picture", "Icon"));
}
// See DevDivBugs 17509. Copying bytes into an aligned buffer if needed
if ((_bestImageOffset % IntPtr.Size) != 0)
{
// Beginning of icon's content is misaligned
byte[] alignedBuffer = new byte[_bestBytesInRes];
Array.Copy(_iconData, _bestImageOffset, alignedBuffer, 0, _bestBytesInRes);
fixed(byte *pbAlignedBuffer = alignedBuffer)
{
_handle = SafeNativeMethods.CreateIconFromResourceEx(pbAlignedBuffer, _bestBytesInRes, true, 0x00030000, 0, 0, 0);
}
}
else
{
try
{
_handle = SafeNativeMethods.CreateIconFromResourceEx(checked (pbIconData + _bestImageOffset), _bestBytesInRes, true, 0x00030000, 0, 0, 0);
}
catch (OverflowException)
{
throw new Win32Exception(SafeNativeMethods.ERROR_INVALID_PARAMETER);
}
}
if (_handle == IntPtr.Zero)
{
throw new Win32Exception();
}
}
}
