tsai
/
ImageSharp
mirror of https://github.com/SixLabors/ImageSharp
1
0
Fork 0
Code Issues Projects Releases Wiki Activity
Browse Source

Changing InputStream and Bits to private fields.

pull/49/head
Olivia 9 years ago
parent
371780cc08
commit
f510331bd7
1 changed files with 56 additions and 45 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 101
      src/ImageSharp/Formats/Jpg/JpegDecoderCore.cs

101
src/ImageSharp/Formats/Jpg/JpegDecoderCore.cs
View File

@ -31,16 +31,6 @@ namespace ImageSharp.Formats
/// </summary>
internal const int LutSize = 8;
/// <summary>
/// The input stream.
/// </summary>
internal Stream InputStream;
/// <summary>
/// Holds the unprocessed bits that have been taken from the byte-stream.
/// </summary>
internal Bits Bits;
/// <summary>
/// The maximum number of color components
/// </summary>
@ -116,6 +106,16 @@ namespace ImageSharp.Formats
/// </summary>
private Bytes bytes;
/// <summary>
/// The byte buffer.
/// </summary>
private Stream inputStream;
/// <summary>
/// Holds the unprocessed bits that have been taken from the byte-stream.
/// </summary>
private Bits bits;
/// <summary>
/// The image width
/// </summary>
@ -205,7 +205,7 @@ namespace ImageSharp.Formats
this.temp = new byte[2 * BlockF.BlockSize];
this.componentArray = new Component[MaxComponents];
this.progCoeffs = new Block8x8F[MaxComponents][];
this.Bits = default(Bits);
this.bits = default(Bits);
this.bytes = Bytes.Create();
// TODO: This looks like it could be static.
@ -246,6 +246,17 @@ namespace ImageSharp.Formats
}
}
/// <summary>
/// Gets the input stream.
/// </summary>
public Stream InputStream
{
get
{
return this.inputStream;
}
}
/// <summary>
/// Decodes the image from the specified this._stream and sets
/// the data to image.
@ -259,7 +270,7 @@ namespace ImageSharp.Formats
where TColor : struct, IPackedPixel<TPacked>
where TPacked : struct, IEquatable<TPacked>
{
this.InputStream = stream;
this.inputStream = stream;
// Check for the Start Of Image marker.
this.ReadFull(this.temp, 0, 2);
@ -487,7 +498,7 @@ namespace ImageSharp.Formats
[MethodImpl(MethodImplOptions.AggressiveInlining)]
internal byte ReadByte()
{
return this.bytes.ReadByte(this.InputStream);
return this.bytes.ReadByte(this.inputStream);
}
/// <summary>
@ -648,19 +659,19 @@ namespace ImageSharp.Formats
throw new ImageFormatException("Uninitialized Huffman table");
}
if (this.Bits.UnreadBits < 8)
if (this.bits.UnreadBits < 8)
{
var errorCode = this.Bits.EnsureNBits(8, this);
var errorCode = this.bits.EnsureNBits(8, this);
if (errorCode == ErrorCodes.NoError)
{
ushort v = huffman.Lut[(this.Bits.Accumulator >> (this.Bits.UnreadBits - LutSize)) & 0xff];
ushort v = huffman.Lut[(this.bits.Accumulator >> (this.bits.UnreadBits - LutSize)) & 0xff];
if (v != 0)
{
byte n = (byte)((v & 0xff) - 1);
this.Bits.UnreadBits -= n;
this.Bits.Mask >>= n;
this.bits.UnreadBits -= n;
this.bits.Mask >>= n;
return (byte)(v >> 8);
}
}
@ -673,22 +684,22 @@ namespace ImageSharp.Formats
int code = 0;
for (int i = 0; i < MaxCodeLength; i++)
{
if (this.Bits.UnreadBits == 0)
if (this.bits.UnreadBits == 0)
{
var errorCode = this.Bits.EnsureNBits(1, this);
var errorCode = this.bits.EnsureNBits(1, this);
if (errorCode != ErrorCodes.NoError)
{
throw new MissingFF00Exception();
}
}
if ((this.Bits.Accumulator & this.Bits.Mask) != 0)
if ((this.bits.Accumulator & this.bits.Mask) != 0)
{
code |= 1;
}
this.Bits.UnreadBits--;
this.Bits.Mask >>= 1;
this.bits.UnreadBits--;
this.bits.Mask >>= 1;
if (code <= huffman.MaxCodes[i])
{
@ -707,18 +718,18 @@ namespace ImageSharp.Formats
/// <returns>The <see cref="bool"/></returns>
private bool DecodeBit()
{
if (this.Bits.UnreadBits == 0)
if (this.bits.UnreadBits == 0)
{
var errorCode = this.Bits.EnsureNBits(1, this);
var errorCode = this.bits.EnsureNBits(1, this);
if (errorCode != ErrorCodes.NoError)
{
throw new MissingFF00Exception();
}
}
bool ret = (this.Bits.Accumulator & this.Bits.Mask) != 0;
this.Bits.UnreadBits--;
this.Bits.Mask >>= 1;
bool ret = (this.bits.Accumulator & this.bits.Mask) != 0;
this.bits.UnreadBits--;
this.bits.Mask >>= 1;
return ret;
}
@ -729,19 +740,19 @@ namespace ImageSharp.Formats
/// <returns>The <see cref="uint"/></returns>
private uint DecodeBits(int count)
{
if (this.Bits.UnreadBits < count)
if (this.bits.UnreadBits < count)
{
var errorCode = this.Bits.EnsureNBits(count, this);
var errorCode = this.bits.EnsureNBits(count, this);
if (errorCode != ErrorCodes.NoError)
{
throw new MissingFF00Exception();
}
}
uint ret = this.Bits.Accumulator >> (this.Bits.UnreadBits - count);
uint ret = this.bits.Accumulator >> (this.bits.UnreadBits - count);
ret = (uint)(ret & ((1 << count) - 1));
this.Bits.UnreadBits -= count;
this.Bits.Mask >>= count;
this.bits.UnreadBits -= count;
this.bits.Mask >>= count;
return ret;
}
@ -756,11 +767,11 @@ namespace ImageSharp.Formats
{
this.bytes.I -= this.bytes.UnreadableBytes;
this.bytes.UnreadableBytes = 0;
if (this.Bits.UnreadBits >= 8)
if (this.bits.UnreadBits >= 8)
{
this.Bits.Accumulator >>= 8;
this.Bits.UnreadBits -= 8;
this.Bits.Mask >>= 8;
this.bits.Accumulator >>= 8;
this.bits.UnreadBits -= 8;
this.bits.Mask >>= 8;
}
}
@ -775,7 +786,7 @@ namespace ImageSharp.Formats
// Unread the overshot bytes, if any.
if (this.bytes.UnreadableBytes != 0)
{
if (this.Bits.UnreadBits >= 8)
if (this.bits.UnreadBits >= 8)
{
this.UnreadByteStuffedByte();
}
@ -798,7 +809,7 @@ namespace ImageSharp.Formats
length -= this.bytes.J - this.bytes.I;
this.bytes.I += this.bytes.J - this.bytes.I;
this.bytes.Fill(this.InputStream);
this.bytes.Fill(this.inputStream);
}
}
}
@ -812,7 +823,7 @@ namespace ImageSharp.Formats
// Unread the overshot bytes, if any.
if (this.bytes.UnreadableBytes != 0)
{
if (this.Bits.UnreadBits >= 8)
if (this.bits.UnreadBits >= 8)
{
this.UnreadByteStuffedByte();
}
@ -835,7 +846,7 @@ namespace ImageSharp.Formats
break;
}
this.bytes.Fill(this.InputStream);
this.bytes.Fill(this.inputStream);
}
}
@ -1541,7 +1552,7 @@ namespace ImageSharp.Formats
}
}
this.Bits = default(Bits);
this.bits = default(Bits);
int mcu = 0;
byte expectedRst = JpegConstants.Markers.RST0;
@ -1694,7 +1705,7 @@ namespace ImageSharp.Formats
}
// Reset the Huffman decoder.
this.Bits = default(Bits);
this.bits = default(Bits);
// Reset the DC components, as per section F.2.1.3.1.
dc = new int[MaxComponents];
@ -1749,7 +1760,7 @@ namespace ImageSharp.Formats
throw new ImageFormatException("Excessive DC component");
}
int deltaDC = this.Bits.ReceiveExtend(value, this);
int deltaDC = this.bits.ReceiveExtend(value, this);
dc[compIndex] += deltaDC;
// b[0] = dc[compIndex] << al;
@ -1777,7 +1788,7 @@ namespace ImageSharp.Formats
break;
}
int ac = this.Bits.ReceiveExtend(val1, this);
int ac = this.bits.ReceiveExtend(val1, this);
// b[Unzig[zig]] = ac << al;
Block8x8F.SetScalarAt(b, unzigPtr[zig], ac << al);

Write Preview
Loading…
Cancel
Save