private static IReadWriteBitmapData?DoLoadBitmapData(IAsyncContext context, Stream stream)
{
context.Progress?.New(DrawingOperation.Loading, 1000);
var reader = new BinaryReader(stream);
if (reader.ReadInt32() != magicNumber)
{
throw new ArgumentException(Res.ImagingNotBitmapDataStream, nameof(stream));
}
var size = new Size(reader.ReadInt32(), reader.ReadInt32());
var pixelFormat = (PixelFormat)reader.ReadInt32();
Color32 backColor = Color32.FromArgb(reader.ReadInt32());
byte alphaThreshold = reader.ReadByte();
Palette?palette = null;
int paletteLength = reader.ReadInt32();
if (paletteLength > 0)
{
var entries = new Color32[paletteLength];
for (int i = 0; i < paletteLength; i++)
{
entries[i] = Color32.FromArgb(reader.ReadInt32());
}
palette = new Palette(entries, backColor, alphaThreshold);
}
context.Progress?.SetProgressValue((int)(stream.Position * 1000 / stream.Length));
if (context.IsCancellationRequested)
{
return(null);
}
IBitmapDataInternal result = CreateManagedBitmapData(size, pixelFormat, backColor, alphaThreshold, palette);
int bpp = pixelFormat.ToBitsPerPixel();
bool canceled = false;
try
{
IBitmapDataRowInternal row = result.DoGetRow(0);
for (int y = 0; y < result.Height; y++)
{
if (canceled = context.IsCancellationRequested)
{
return(null);
}
switch (bpp)
{
case 32:
for (int x = 0; x < result.Width; x++)
{
row.DoWriteRaw(x, reader.ReadInt32());
}
break;
case 16:
for (int x = 0; x < result.Width; x++)
{
row.DoWriteRaw(x, reader.ReadInt16());
}
break;
case 64:
for (int x = 0; x < result.Width; x++)
{
row.DoWriteRaw(x, reader.ReadInt64());
}
break;
default:
for (int x = 0; x < result.RowSize; x++)
{
row.DoWriteRaw(x, reader.ReadByte());
}
break;
}
row.MoveNextRow();
context.Progress?.SetProgressValue((int)(stream.Position * 1000 / stream.Length));
}
return((canceled = context.IsCancellationRequested) ? null : result);
}
finally
{
if (canceled)
{
result.Dispose();
}
}
}
public OptimizedPaletteQuantizerSession(OptimizedPaletteQuantizer quantizer, IReadableBitmapData source, IAsyncContext context)
{
this.quantizer = quantizer;
Palette = InitializePalette(source, context);
}
internal Palette(Palette palette, Color32 backColor, byte alphaThreshold)
: this(palette.Entries, backColor, alphaThreshold, palette.customGetNearestColorIndex)
{
}
/// <summary>
/// Creates a managed <see cref="IBitmapDataInternal"/> with the specified <paramref name="size"/> and <paramref name="pixelFormat"/>.
/// </summary>
internal static IBitmapDataInternal CreateManagedBitmapData(Size size, PixelFormat pixelFormat = PixelFormat.Format32bppArgb, Color32 backColor = default, byte alphaThreshold = 128, Palette palette = null)
{
if (pixelFormat.IsIndexed() && palette != null)
{
int maxColors = 1 << pixelFormat.ToBitsPerPixel();
if (palette.Count > maxColors)
{
throw new ArgumentException(Res.ImagingPaletteTooLarge(maxColors, pixelFormat), nameof(palette));
}
}
Debug.Assert(palette == null || backColor.ToOpaque() == palette.BackColor && alphaThreshold == palette.AlphaThreshold);
switch (pixelFormat)
{
case PixelFormat.Format32bppArgb:
return(new ManagedBitmapData <Color32, ManagedBitmapDataRow32Argb>(size, pixelFormat));
case PixelFormat.Format32bppPArgb:
return(new ManagedBitmapData <Color32, ManagedBitmapDataRow32PArgb>(size, pixelFormat));
case PixelFormat.Format32bppRgb:
return(new ManagedBitmapData <Color32, ManagedBitmapDataRow32Rgb>(size, pixelFormat, backColor, alphaThreshold));
case PixelFormat.Format24bppRgb:
return(new ManagedBitmapData <Color24, ManagedBitmapDataRow24Rgb>(size, pixelFormat, backColor, alphaThreshold));
case PixelFormat.Format8bppIndexed:
return(new ManagedBitmapData <byte, ManagedBitmapDataRow8I>(size, pixelFormat, backColor, alphaThreshold, palette));
case PixelFormat.Format4bppIndexed:
return(new ManagedBitmapData <byte, ManagedBitmapDataRow4I>(size, pixelFormat, backColor, alphaThreshold, palette));
case PixelFormat.Format1bppIndexed:
return(new ManagedBitmapData <byte, ManagedBitmapDataRow1I>(size, pixelFormat, backColor, alphaThreshold, palette));
case PixelFormat.Format64bppArgb:
return(new ManagedBitmapData <Color64, ManagedBitmapDataRow64Argb>(size, pixelFormat));
case PixelFormat.Format64bppPArgb:
return(new ManagedBitmapData <Color64, ManagedBitmapDataRow64PArgb>(size, pixelFormat));
case PixelFormat.Format48bppRgb:
return(new ManagedBitmapData <Color48, ManagedBitmapDataRow48Rgb>(size, pixelFormat, backColor, alphaThreshold));
case PixelFormat.Format16bppRgb565:
return(new ManagedBitmapData <Color16Rgb565, ManagedBitmapDataRow16Rgb565>(size, pixelFormat, backColor, alphaThreshold));
case PixelFormat.Format16bppRgb555:
return(new ManagedBitmapData <Color16Rgb555, ManagedBitmapDataRow16Rgb555>(size, pixelFormat, backColor, alphaThreshold));
case PixelFormat.Format16bppArgb1555:
return(new ManagedBitmapData <Color16Argb1555, ManagedBitmapDataRow16Argb1555>(size, pixelFormat, backColor, alphaThreshold));
case PixelFormat.Format16bppGrayScale:
return(new ManagedBitmapData <Color16Gray, ManagedBitmapDataRow16Gray>(size, pixelFormat, backColor, alphaThreshold));
default:
throw new ArgumentOutOfRangeException(nameof(pixelFormat), Res.PixelFormatInvalid(pixelFormat));
}
}
internal static IBitmapDataInternal CreateBitmapData(Bitmap bitmap, ImageLockMode lockMode, Color32 backColor = default, byte alphaThreshold = 128, Palette palette = null)
{
if (bitmap == null)
{
throw new ArgumentNullException(nameof(bitmap), PublicResources.ArgumentNull);
}
if (!lockMode.IsDefined())
{
throw new ArgumentOutOfRangeException(nameof(lockMode), PublicResources.EnumOutOfRange(lockMode));
}
Debug.Assert(palette == null || backColor.ToOpaque() == palette.BackColor && alphaThreshold == palette.AlphaThreshold);
var pixelFormat = bitmap.PixelFormat;
switch (pixelFormat)
{
case PixelFormat.Format32bppArgb:
return(new NativeBitmapData <NativeBitmapDataRow32Argb>(bitmap, pixelFormat, lockMode));
case PixelFormat.Format32bppPArgb:
return(new NativeBitmapData <NativeBitmapDataRow32PArgb>(bitmap, pixelFormat, lockMode));
case PixelFormat.Format32bppRgb:
return(new NativeBitmapData <NativeBitmapDataRow32Rgb>(bitmap, pixelFormat, lockMode, backColor, alphaThreshold));
case PixelFormat.Format24bppRgb:
return(new NativeBitmapData <NativeBitmapDataRow24Rgb>(bitmap, pixelFormat, lockMode, backColor, alphaThreshold));
case PixelFormat.Format8bppIndexed:
return(new NativeBitmapData <NativeBitmapDataRow8I>(bitmap, pixelFormat, lockMode, backColor, alphaThreshold, palette));
case PixelFormat.Format4bppIndexed:
return(new NativeBitmapData <NativeBitmapDataRow4I>(bitmap, pixelFormat, lockMode, backColor, alphaThreshold, palette));
case PixelFormat.Format1bppIndexed:
return(new NativeBitmapData <NativeBitmapDataRow1I>(bitmap, pixelFormat, lockMode, backColor, alphaThreshold, palette));
case PixelFormat.Format64bppArgb:
return(new NativeBitmapData <NativeBitmapDataRow64Argb>(bitmap, pixelFormat, lockMode));
case PixelFormat.Format64bppPArgb:
return(new NativeBitmapData <NativeBitmapDataRow64PArgb>(bitmap, pixelFormat, lockMode));
case PixelFormat.Format48bppRgb:
return(new NativeBitmapData <NativeBitmapDataRow48Rgb>(bitmap, pixelFormat, lockMode, backColor, alphaThreshold));
case PixelFormat.Format16bppRgb565:
return(OSUtils.IsWindows
? (NativeBitmapDataBase) new NativeBitmapData <NativeBitmapDataRow16Rgb565>(bitmap, pixelFormat, lockMode, backColor, alphaThreshold)
: new NativeBitmapData <NativeBitmapDataRow16Rgb565Via24Bpp>(bitmap, PixelFormat.Format24bppRgb, lockMode, backColor, alphaThreshold));
case PixelFormat.Format16bppRgb555:
return(OSUtils.IsWindows
? (NativeBitmapDataBase) new NativeBitmapData <NativeBitmapDataRow16Rgb555>(bitmap, pixelFormat, lockMode, backColor, alphaThreshold)
: new NativeBitmapData <NativeBitmapDataRow16Rgb555Via24Bpp>(bitmap, PixelFormat.Format24bppRgb, lockMode, backColor, alphaThreshold));
case PixelFormat.Format16bppArgb1555:
return(new NativeBitmapData <NativeBitmapDataRow16Argb1555>(bitmap, pixelFormat, lockMode, backColor, alphaThreshold));
case PixelFormat.Format16bppGrayScale:
return(new NativeBitmapData <NativeBitmapDataRow16Gray>(bitmap, pixelFormat, lockMode, backColor, alphaThreshold));
default:
throw new InvalidOperationException(Res.InternalError($"Unexpected pixel format {pixelFormat}"));
}
}
/// <summary>
/// Creates a managed <see cref="IReadWriteBitmapData"/> with the specified <paramref name="size"/>, <paramref name="pixelFormat"/> and <paramref name="palette"/>.
/// <br/>See the <strong>Remarks</strong> section for details.
/// </summary>
/// <exception cref="ArgumentOutOfRangeException"><paramref name="size"/> or <paramref name="pixelFormat"/> has an invalid value.</exception>
/// <exception cref="ArgumentException"><paramref name="palette"/> contains too many colors for the indexed format specified by <paramref name="pixelFormat"/>.</exception>
/// <param name="size">The size of the bitmap data to create.</param>
/// <param name="pixelFormat">The desired pixel format of the bitmap data to create.</param>
/// <param name="palette">If <paramref name="pixelFormat"/> specifies an indexed format, then specifies the desired <see cref="IBitmapData.Palette"/> of the returned <see cref="IReadWriteBitmapData"/> instance.
/// It determines also the <see cref="IBitmapData.BackColor"/> and <see cref="IBitmapData.AlphaThreshold"/> properties of the result.</param>
/// <returns>A managed <see cref="IReadWriteBitmapData"/> with the specified <paramref name="size"/>, <paramref name="pixelFormat"/> and <paramref name="palette"/>.</returns>
/// <remarks>
/// <para>All possible <see cref="PixelFormat"/>s are supported, regardless of the native <see cref="Bitmap"/> support of the current operating system.
/// <note>When <paramref name="pixelFormat"/> specifies a wide-color format (48/64 bit or 16 bit grayscale), then the returned instance will use the full 16-bit range of the color channels.
/// This means a different raw content to Windows' wide-color <see cref="Bitmap"/> instances, which use 13-bit channels. But this difference is transparent in most cases
/// unless we access actual raw content by the <see cref="IReadableBitmapDataRow.ReadRaw{T}">ReadRaw</see> and <see cref="IWritableBitmapDataRow.WriteRaw{T}">WriteRaw</see> methods.</note></para>
/// <para>If <paramref name="palette"/> is not specified, then a default palette will be used for indexed formats, and a default <see cref="IBitmapData.BackColor"/> and <see cref="IBitmapData.AlphaThreshold"/>
/// value will be used.</para>
/// <note type="tip">
/// <list type="bullet">
/// <item>You can use the <see cref="BitmapDataExtensions.ToBitmap">ToBitmap</see> extension method to convert the created <see cref="IReadWriteBitmapData"/> to a <see cref="Bitmap"/> instance.</item>
/// <item>To create an <see cref="IReadWriteBitmapData"/> instance from a native <see cref="Bitmap"/> use the <see cref="BitmapExtensions.GetReadWriteBitmapData">GetReadWriteBitmapData</see> extension method.</item>
/// </list></note>
/// </remarks>
/// <seealso cref="CreateBitmapData(Size, PixelFormat, Color32, byte)"/>
/// <seealso cref="BitmapDataExtensions.ToBitmap"/>
/// <seealso cref="BitmapExtensions.GetReadableBitmapData"/>
/// <seealso cref="BitmapExtensions.GetWritableBitmapData"/>
/// <seealso cref="BitmapExtensions.GetReadWriteBitmapData"/>
public static IReadWriteBitmapData CreateBitmapData(Size size, PixelFormat pixelFormat, Palette palette)
{
if (size.Width < 1 || size.Height < 1)
{
throw new ArgumentOutOfRangeException(nameof(size), PublicResources.ArgumentOutOfRange);
}
if (!pixelFormat.IsValidFormat())
{
throw new ArgumentOutOfRangeException(nameof(pixelFormat), Res.PixelFormatInvalid(pixelFormat));
}
return(CreateManagedBitmapData(size, pixelFormat, palette?.BackColor ?? default, palette?.AlphaThreshold ?? 128, palette));
}
internal ManagedBitmapData(Size size, PixelFormat pixelFormat, Color32 backColor = default, byte alphaThreshold = 0, Palette palette = null)
{
Debug.Assert(size.Width > 0 && size.Height > 0, "Non-empty size expected");
Debug.Assert(pixelFormat.IsValidFormat(), "Valid format expected");
Debug.Assert(!pixelFormat.IsIndexed() || typeof(TColor) == typeof(byte), "For indexed pixel formats byte elements are expected");
BackColor = pixelFormat.HasMultiLevelAlpha() ? default : backColor.ToOpaque();
AlphaThreshold = alphaThreshold;
PixelFormat = pixelFormat;
Width = size.Width;
// Unlike native bitmaps our stride have 1 byte alignment so Stride = (Width * bpp + 7) / 8)
int bpp = pixelFormat.ToBitsPerPixel();
int byteWidth = pixelFormat.GetByteWidth(size.Width);
RowSize = byteWidth;
Buffer = new Array2D <TColor>(size.Height, bpp <= 8 ? byteWidth : size.Width);
if (!pixelFormat.IsIndexed())
{
return;
}
if (palette != null)
{
Debug.Assert(palette.Entries.Length <= (1 << bpp), "Too many colors");
Palette = palette;
return;
}
// if there was no palette specified we use a default one
Palette = pixelFormat switch
{
PixelFormat.Format8bppIndexed => Palette.SystemDefault8BppPalette(backColor, alphaThreshold),
PixelFormat.Format4bppIndexed => Palette.SystemDefault4BppPalette(backColor),
_ => Palette.SystemDefault1BppPalette(backColor)
};
}