/// <inheritdoc/>
public unsafe override BitmapSource Read(byte *data, int dataLength, BitmapReaderFlags rFlags)
{
BITMAP_READ_DETAILS info;
uint bcrFlags = (uint)rFlags;
BitmapCore.ReadHeader(data, dataLength, out info, bcrFlags);
return(BitmapWpfInternal.Read(ref info, data + info.imgDataOffset, bcrFlags));
}
/// <summary>
/// Read a bitmap from a byte array.
/// </summary>
public static TBitmap FromBytes(byte[] data, BitmapReaderFlags pFlags)
{
var impl = new TSelf();
return(impl.Read(data, pFlags));
}
/// <summary>
/// Read a bitmap from a data stream (such as a web request, or a filestream).
/// </summary>
public static TBitmap FromStream(Stream stream, BitmapReaderFlags pFlags)
{
var impl = new TSelf();
return(impl.Read(stream, pFlags));
}
/// <inheritdoc/> public abstract unsafe TBitmap Read(byte *data, int dataLength, BitmapReaderFlags rFlags);
/// <inheritdoc/>
public unsafe TBitmap Read(byte[] data, BitmapReaderFlags pFlags)
{
fixed(byte *ptr = data)
return(Read(ptr, data.Length, pFlags));
}
/// <inheritdoc/> public TBitmap Read(Stream stream, BitmapReaderFlags pFlags) => Read(StructUtil.ReadBytes(stream), pFlags);
/// <inheritdoc/>
public override unsafe Bitmap Read(byte *data, int dataLength, BitmapReaderFlags rFlags)
{
uint bcrFlags = (uint)rFlags;
BITMAP_READ_DETAILS info;
BitmapCore.ReadHeader(data, dataLength, out info, bcrFlags);
byte *pixels = data + info.imgDataOffset;
// we do this parsing here since BitmapCore has no references to System.Drawing
if (info.compression == BitmapCompressionMode.BI_PNG || info.compression == BitmapCompressionMode.BI_JPEG)
{
return(new Bitmap(new PointerStream(pixels, info.imgDataSize)));
}
// defaults
PixelFormat gdiFmt = PixelFormat.Format32bppArgb;
BitmapCorePixelFormat coreFmt = BitmapCorePixelFormat.Bgra32;
var formatbgra32 = (rFlags & BitmapReaderFlags.ForceFormatBGRA32) > 0;
if (!formatbgra32 && info.imgSourceFmt != null)
{
var origFmt = info.imgSourceFmt;
if (origFmt == BitmapCorePixelFormat.Rgb24)
{
// we need BitmapCore to reverse the pixel order for GDI
coreFmt = BitmapCorePixelFormat.Bgr24;
gdiFmt = PixelFormat.Format24bppRgb;
}
else
{
var pxarr = Formats.Where(f => f.coreFmt == origFmt).ToArray();
if (pxarr.Length > 0)
{
var px = pxarr.First();
gdiFmt = px.gdiFmt;
coreFmt = px.coreFmt;
}
}
}
Bitmap bitmap = new Bitmap(info.imgWidth, info.imgHeight, gdiFmt);
var dlock = bitmap.LockBits(new Rectangle(0, 0, info.imgWidth, info.imgHeight), ImageLockMode.ReadWrite, gdiFmt);
var buf = (byte *)dlock.Scan0;
BitmapCore.ReadPixels(ref info, coreFmt, pixels, buf, bcrFlags);
bitmap.UnlockBits(dlock);
// update bitmap color palette
var gdipPalette = bitmap.Palette;
if (info.imgColorTable != null && gdipPalette?.Entries != null && gdipPalette.Entries.Length > 0)
{
for (int i = 0; i < info.imgColorTable.Length && i < gdipPalette.Entries.Length; i++)
{
var quad = info.imgColorTable[i];
gdipPalette.Entries[i] = Color.FromArgb(0xFF, quad.rgbRed, quad.rgbGreen, quad.rgbBlue);
}
bitmap.Palette = gdipPalette;
}
return(bitmap);
}
