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

store scale as vector + remove unneeded bit or operations 

`var t = blah | 0;` in js is for trimming floats into ints c# doesn't need it
pull/298/head
Scott Williams 9 years ago
parent
5086b08b95
commit
290646afcb
4 changed files with 21 additions and 26 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. 11
      src/ImageSharp/Formats/Jpeg/Port/Components/Component.cs
  2. 11
      src/ImageSharp/Formats/Jpeg/Port/Components/JpegPixelArea.cs
  3. 20
      src/ImageSharp/Formats/Jpeg/Port/Components/ScanDecoder.cs
  4. 5
      src/ImageSharp/Formats/Jpeg/Port/JpegDecoderCore.cs

11
src/ImageSharp/Formats/Jpeg/Port/Components/Component.cs
View File

@ -6,7 +6,7 @@
namespace ImageSharp.Formats.Jpeg.Port.Components
{
using System;
using System.Numerics;
using ImageSharp.Memory;
/// <summary>
@ -20,14 +20,9 @@ namespace ImageSharp.Formats.Jpeg.Port.Components
public Buffer<short> Output;
/// <summary>
/// Gets or sets the horizontal scaling factor
/// </summary>
public float ScaleX;
/// <summary>
/// Gets or sets the vertical scaling factor
/// Gets or sets the scaling factors
/// </summary>
public float ScaleY;
public Vector2 Scale;
/// <summary>
/// Gets or sets the number of blocks per line

11
src/ImageSharp/Formats/Jpeg/Port/Components/JpegPixelArea.cs
View File

@ -7,6 +7,7 @@ namespace ImageSharp.Formats.Jpeg.Port.Components
{
using System;
using System.Diagnostics;
using System.Numerics;
using System.Runtime.CompilerServices;
using ImageSharp.Memory;
@ -68,9 +69,8 @@ namespace ImageSharp.Formats.Jpeg.Port.Components
this.Height = height;
int numberOfComponents = this.NumberOfComponents;
this.rowStride = width * numberOfComponents;
var scale = new Vector2(this.imageWidth / (float)width, this.imageHeight / (float)height);
float scaleX = this.imageWidth / (float)width;
float scaleY = this.imageHeight / (float)height;
this.componentData = new Buffer<byte>(width * height * numberOfComponents);
Span<byte> componentDataSpan = this.componentData;
const uint Mask3Lsb = 0xFFFFFFF8; // Used to clear the 3 LSBs
@ -81,8 +81,7 @@ namespace ImageSharp.Formats.Jpeg.Port.Components
for (int i = 0; i < numberOfComponents; i++)
{
ref Component component = ref components.Components[i];
float componentScaleX = component.ScaleX * scaleX;
float componentScaleY = component.ScaleY * scaleY;
Vector2 componentScale = component.Scale * scale;
int offset = i;
Span<short> output = component.Output;
int blocksPerScanline = (component.BlocksPerLine + 1) << 3;
@ -91,14 +90,14 @@ namespace ImageSharp.Formats.Jpeg.Port.Components
int j;
for (int x = 0; x < width; x++)
{
j = 0 | (int)(x * componentScaleX);
j = (int)(x * componentScale.X);
xScaleBlockOffsetSpan[x] = (int)((j & Mask3Lsb) << 3) | (j & 7);
}
// Linearize the blocks of the component
for (int y = 0; y < height; y++)
{
j = 0 | (int)(y * componentScaleY);
j = (int)(y * componentScale.Y);
int index = blocksPerScanline * (int)(j & Mask3Lsb) | ((j & 7) << 3);
for (int x = 0; x < width; x++)
{

20
src/ImageSharp/Formats/Jpeg/Port/Components/ScanDecoder.cs
View File

@ -478,7 +478,7 @@ namespace ImageSharp.Formats.Jpeg.Port.Components
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private void DecodeBlockBaseline(ref HuffmanTable dcHuffmanTable, ref HuffmanTable acHuffmanTable, ref FrameComponent component, int mcu, Stream stream)
{
int blockRow = (mcu / component.BlocksPerLine) | 0;
int blockRow = mcu / component.BlocksPerLine;
int blockCol = mcu % component.BlocksPerLine;
int offset = GetBlockBufferOffset(component, blockRow, blockCol);
this.DecodeBaseline(ref component, offset, ref dcHuffmanTable, ref acHuffmanTable, stream);
@ -487,7 +487,7 @@ namespace ImageSharp.Formats.Jpeg.Port.Components
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private void DecodeMcuBaseline(ref HuffmanTable dcHuffmanTable, ref HuffmanTable acHuffmanTable, ref FrameComponent component, int mcusPerLine, int mcu, int row, int col, Stream stream)
{
int mcuRow = (mcu / mcusPerLine) | 0;
int mcuRow = mcu / mcusPerLine;
int mcuCol = mcu % mcusPerLine;
int blockRow = (mcuRow * component.VerticalFactor) + row;
int blockCol = (mcuCol * component.HorizontalFactor) + col;
@ -498,7 +498,7 @@ namespace ImageSharp.Formats.Jpeg.Port.Components
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private void DecodeBlockDCFirst(ref HuffmanTable dcHuffmanTable, ref FrameComponent component, int mcu, Stream stream)
{
int blockRow = (mcu / component.BlocksPerLine) | 0;
int blockRow = mcu / component.BlocksPerLine;
int blockCol = mcu % component.BlocksPerLine;
int offset = GetBlockBufferOffset(component, blockRow, blockCol);
this.DecodeDCFirst(ref component, offset, ref dcHuffmanTable, stream);
@ -507,7 +507,7 @@ namespace ImageSharp.Formats.Jpeg.Port.Components
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private void DecodeMcuDCFirst(ref HuffmanTable dcHuffmanTable, ref FrameComponent component, int mcusPerLine, int mcu, int row, int col, Stream stream)
{
int mcuRow = (mcu / mcusPerLine) | 0;
int mcuRow = mcu / mcusPerLine;
int mcuCol = mcu % mcusPerLine;
int blockRow = (mcuRow * component.VerticalFactor) + row;
int blockCol = (mcuCol * component.HorizontalFactor) + col;
@ -518,7 +518,7 @@ namespace ImageSharp.Formats.Jpeg.Port.Components
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private void DecodeBlockDCSuccessive(ref FrameComponent component, int mcu, Stream stream)
{
int blockRow = (mcu / component.BlocksPerLine) | 0;
int blockRow = mcu / component.BlocksPerLine;
int blockCol = mcu % component.BlocksPerLine;
int offset = GetBlockBufferOffset(component, blockRow, blockCol);
this.DecodeDCSuccessive(ref component, offset, stream);
@ -527,7 +527,7 @@ namespace ImageSharp.Formats.Jpeg.Port.Components
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private void DecodeMcuDCSuccessive(ref FrameComponent component, int mcusPerLine, int mcu, int row, int col, Stream stream)
{
int mcuRow = (mcu / mcusPerLine) | 0;
int mcuRow = mcu / mcusPerLine;
int mcuCol = mcu % mcusPerLine;
int blockRow = (mcuRow * component.VerticalFactor) + row;
int blockCol = (mcuCol * component.HorizontalFactor) + col;
@ -538,7 +538,7 @@ namespace ImageSharp.Formats.Jpeg.Port.Components
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private void DecodeBlockACFirst(ref HuffmanTable acHuffmanTable, ref FrameComponent component, int mcu, Stream stream)
{
int blockRow = (mcu / component.BlocksPerLine) | 0;
int blockRow = mcu / component.BlocksPerLine;
int blockCol = mcu % component.BlocksPerLine;
int offset = GetBlockBufferOffset(component, blockRow, blockCol);
this.DecodeACFirst(ref component, offset, ref acHuffmanTable, stream);
@ -547,7 +547,7 @@ namespace ImageSharp.Formats.Jpeg.Port.Components
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private void DecodeMcuACFirst(ref HuffmanTable acHuffmanTable, ref FrameComponent component, int mcusPerLine, int mcu, int row, int col, Stream stream)
{
int mcuRow = (mcu / mcusPerLine) | 0;
int mcuRow = mcu / mcusPerLine;
int mcuCol = mcu % mcusPerLine;
int blockRow = (mcuRow * component.VerticalFactor) + row;
int blockCol = (mcuCol * component.HorizontalFactor) + col;
@ -558,7 +558,7 @@ namespace ImageSharp.Formats.Jpeg.Port.Components
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private void DecodeBlockACSuccessive(ref HuffmanTable acHuffmanTable, ref FrameComponent component, int mcu, Stream stream)
{
int blockRow = (mcu / component.BlocksPerLine) | 0;
int blockRow = mcu / component.BlocksPerLine;
int blockCol = mcu % component.BlocksPerLine;
int offset = GetBlockBufferOffset(component, blockRow, blockCol);
this.DecodeACSuccessive(ref component, offset, ref acHuffmanTable, stream);
@ -567,7 +567,7 @@ namespace ImageSharp.Formats.Jpeg.Port.Components
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private void DecodeMcuACSuccessive(ref HuffmanTable acHuffmanTable, ref FrameComponent component, int mcusPerLine, int mcu, int row, int col, Stream stream)
{
int mcuRow = (mcu / mcusPerLine) | 0;
int mcuRow = mcu / mcusPerLine;
int mcuCol = mcu % mcusPerLine;
int blockRow = (mcuRow * component.VerticalFactor) + row;
int blockCol = (mcuCol * component.HorizontalFactor) + col;

5
src/ImageSharp/Formats/Jpeg/Port/JpegDecoderCore.cs
View File

@ -277,8 +277,9 @@ namespace ImageSharp.Formats.Jpeg.Port
ref var frameComponent = ref this.frame.Components[i];
var component = new Component
{
ScaleX = frameComponent.HorizontalFactor / (float)this.frame.MaxHorizontalFactor,
ScaleY = frameComponent.VerticalFactor / (float)this.frame.MaxVerticalFactor,
Scale = new System.Numerics.Vector2(
frameComponent.HorizontalFactor / (float)this.frame.MaxHorizontalFactor,
frameComponent.VerticalFactor / (float)this.frame.MaxVerticalFactor),
BlocksPerLine = frameComponent.BlocksPerLine,
BlocksPerColumn = frameComponent.BlocksPerColumn
};

Write Preview
Loading…
Cancel
Save