@ -1,8 +1,8 @@
// Copyright (c) Six Labors.
// Licensed under the Six Labors Split License.
# nullable disable
using System.Buffers ;
using System.Diagnostics.CodeAnalysis ;
using System.Runtime.CompilerServices ;
using SixLabors.ImageSharp.IO ;
using SixLabors.ImageSharp.Memory ;
@ -29,12 +29,12 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
/// <summary>
/// The metadata.
/// </summary>
private ImageMetadata metadata ;
private ImageMetadata ? metadata ;
/// <summary>
/// The tga specific metadata.
/// </summary>
private TgaMetadata tgaMetadata ;
private TgaMetadata ? tgaMetadata ;
/// <summary>
/// The file header containing general information about the image.
@ -46,11 +46,6 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
/// </summary>
private readonly MemoryAllocator memoryAllocator ;
/// <summary>
/// The stream to decode from.
/// </summary>
private BufferedReadStream currentStream ;
/// <summary>
/// Indicates whether there is a alpha channel present.
/// </summary>
@ -80,7 +75,7 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
try
{
TgaImageOrigin origin = this . ReadFileHeader ( stream ) ;
this . currentS tream. Skip ( this . fileHeader . IdLength ) ;
s tream. Skip ( this . fileHeader . IdLength ) ;
// Parse the color map, if present.
if ( this . fileHeader . ColorMapType is not 0 and not 1 )
@ -93,7 +88,7 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
throw new UnknownImageFormatException ( "Width or height cannot be 0" ) ;
}
var image = Image . CreateUninitialized < TPixel > ( this . configuration , this . fileHeader . Width , this . fileHeader . Height , this . metadata ) ;
Image < TPixel > image = Image . CreateUninitialized < TPixel > ( this . configuration , this . fileHeader . Width , this . fileHeader . Height , this . metadata ) ;
Buffer2D < TPixel > pixels = image . GetRootFramePixelBuffer ( ) ;
if ( this . fileHeader . ColorMapType = = 1 )
@ -113,7 +108,7 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
using ( IMemoryOwner < byte > palette = this . memoryAllocator . Allocate < byte > ( colorMapSizeInBytes , AllocationOptions . Clean ) )
{
Span < byte > paletteSpan = palette . GetSpan ( ) ;
int bytesRead = this . currentS tream. Read ( paletteSpan , this . fileHeader . CMapStart , colorMapSizeInBytes ) ;
int bytesRead = s tream. Read ( paletteSpan , this . fileHeader . CMapStart , colorMapSizeInBytes ) ;
if ( bytesRead ! = colorMapSizeInBytes )
{
TgaThrowHelper . ThrowInvalidImageContentException ( "Not enough data to read the color map" ) ;
@ -122,6 +117,7 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
if ( this . fileHeader . ImageType = = TgaImageType . RleColorMapped )
{
this . ReadPalettedRle (
stream ,
this . fileHeader . Width ,
this . fileHeader . Height ,
pixels ,
@ -132,6 +128,7 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
else
{
this . ReadPaletted (
stream ,
this . fileHeader . Width ,
this . fileHeader . Height ,
pixels ,
@ -148,7 +145,7 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
if ( this . fileHeader . CMapLength > 0 )
{
int colorMapPixelSizeInBytes = this . fileHeader . CMapDepth / 8 ;
this . currentS tream. Skip ( this . fileHeader . CMapLength * colorMapPixelSizeInBytes ) ;
s tream. Skip ( this . fileHeader . CMapLength * colorMapPixelSizeInBytes ) ;
}
switch ( this . fileHeader . PixelDepth )
@ -156,11 +153,11 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
case 8 :
if ( this . fileHeader . ImageType . IsRunLengthEncoded ( ) )
{
this . ReadRle ( this . fileHeader . Width , this . fileHeader . Height , pixels , 1 , origin ) ;
this . ReadRle ( stream , this . fileHeader . Width , this . fileHeader . Height , pixels , 1 , origin ) ;
}
else
{
this . ReadMonoChrome ( this . fileHeader . Width , this . fileHeader . Height , pixels , origin ) ;
this . ReadMonoChrome ( stream , this . fileHeader . Width , this . fileHeader . Height , pixels , origin ) ;
}
break ;
@ -169,11 +166,11 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
case 1 6 :
if ( this . fileHeader . ImageType . IsRunLengthEncoded ( ) )
{
this . ReadRle ( this . fileHeader . Width , this . fileHeader . Height , pixels , 2 , origin ) ;
this . ReadRle ( stream , this . fileHeader . Width , this . fileHeader . Height , pixels , 2 , origin ) ;
}
else
{
this . ReadBgra16 ( this . fileHeader . Width , this . fileHeader . Height , pixels , origin ) ;
this . ReadBgra16 ( stream , this . fileHeader . Width , this . fileHeader . Height , pixels , origin ) ;
}
break ;
@ -181,11 +178,11 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
case 2 4 :
if ( this . fileHeader . ImageType . IsRunLengthEncoded ( ) )
{
this . ReadRle ( this . fileHeader . Width , this . fileHeader . Height , pixels , 3 , origin ) ;
this . ReadRle ( stream , this . fileHeader . Width , this . fileHeader . Height , pixels , 3 , origin ) ;
}
else
{
this . ReadBgr24 ( this . fileHeader . Width , this . fileHeader . Height , pixels , origin ) ;
this . ReadBgr24 ( stream , this . fileHeader . Width , this . fileHeader . Height , pixels , origin ) ;
}
break ;
@ -193,11 +190,11 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
case 3 2 :
if ( this . fileHeader . ImageType . IsRunLengthEncoded ( ) )
{
this . ReadRle ( this . fileHeader . Width , this . fileHeader . Height , pixels , 4 , origin ) ;
this . ReadRle ( stream , this . fileHeader . Width , this . fileHeader . Height , pixels , 4 , origin ) ;
}
else
{
this . ReadBgra32 ( this . fileHeader . Width , this . fileHeader . Height , pixels , origin ) ;
this . ReadBgra32 ( stream , this . fileHeader . Width , this . fileHeader . Height , pixels , origin ) ;
}
break ;
@ -219,13 +216,14 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
/// Reads a uncompressed TGA image with a palette.
/// </summary>
/// <typeparam name="TPixel">The pixel type.</typeparam>
/// <param name="stream">The <see cref="BufferedReadStream"/> containing image data.</param>
/// <param name="width">The width of the image.</param>
/// <param name="height">The height of the image.</param>
/// <param name="pixels">The <see cref="Buffer2D{TPixel}"/> to assign the palette to.</param>
/// <param name="palette">The color palette.</param>
/// <param name="colorMapPixelSizeInBytes">Color map size of one entry in bytes.</param>
/// <param name="origin">The image origin.</param>
private void ReadPaletted < TPixel > ( int width , int height , Buffer2D < TPixel > pixels , Span < byte > palette , int colorMapPixelSizeInBytes , TgaImageOrigin origin )
private void ReadPaletted < TPixel > ( BufferedReadStream stream , int width , int height , Buffer2D < TPixel > pixels , Span < byte > palette , int colorMapPixelSizeInBytes , TgaImageOrigin origin )
where TPixel : unmanaged , IPixel < TPixel >
{
TPixel color = default ;
@ -243,14 +241,14 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
{
for ( int x = width - 1 ; x > = 0 ; x - - )
{
this . ReadPalettedBgra16Pixel ( palette , colorMapPixelSizeInBytes , x , color , pixelRow ) ;
this . ReadPalettedBgra16Pixel ( stream , palette , colorMapPixelSizeInBytes , x , color , pixelRow ) ;
}
}
else
{
for ( int x = 0 ; x < width ; x + + )
{
this . ReadPalettedBgra16Pixel ( palette , colorMapPixelSizeInBytes , x , color , pixelRow ) ;
this . ReadPalettedBgra16Pixel ( stream , palette , colorMapPixelSizeInBytes , x , color , pixelRow ) ;
}
}
@ -261,14 +259,14 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
{
for ( int x = width - 1 ; x > = 0 ; x - - )
{
this . ReadPalettedBgr24Pixel ( palette , colorMapPixelSizeInBytes , x , color , pixelRow ) ;
ReadPalettedBgr24Pixel ( stream , palette , colorMapPixelSizeInBytes , x , color , pixelRow ) ;
}
}
else
{
for ( int x = 0 ; x < width ; x + + )
{
this . ReadPalettedBgr24Pixel ( palette , colorMapPixelSizeInBytes , x , color , pixelRow ) ;
ReadPalettedBgr24Pixel ( stream , palette , colorMapPixelSizeInBytes , x , color , pixelRow ) ;
}
}
@ -279,14 +277,14 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
{
for ( int x = width - 1 ; x > = 0 ; x - - )
{
this . ReadPalettedBgra32Pixel ( palette , colorMapPixelSizeInBytes , x , color , pixelRow ) ;
ReadPalettedBgra32Pixel ( stream , palette , colorMapPixelSizeInBytes , x , color , pixelRow ) ;
}
}
else
{
for ( int x = 0 ; x < width ; x + + )
{
this . ReadPalettedBgra32Pixel ( palette , colorMapPixelSizeInBytes , x , color , pixelRow ) ;
ReadPalettedBgra32Pixel ( stream , palette , colorMapPixelSizeInBytes , x , color , pixelRow ) ;
}
}
@ -299,48 +297,47 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
/// Reads a run length encoded TGA image with a palette.
/// </summary>
/// <typeparam name="TPixel">The pixel type.</typeparam>
/// <param name="stream">The <see cref="BufferedReadStream"/> containing image data.</param>
/// <param name="width">The width of the image.</param>
/// <param name="height">The height of the image.</param>
/// <param name="pixels">The <see cref="Buffer2D{TPixel}"/> to assign the palette to.</param>
/// <param name="palette">The color palette.</param>
/// <param name="colorMapPixelSizeInBytes">Color map size of one entry in bytes.</param>
/// <param name="origin">The image origin.</param>
private void ReadPalettedRle < TPixel > ( int width , int height , Buffer2D < TPixel > pixels , Span < byte > palette , int colorMapPixelSizeInBytes , TgaImageOrigin origin )
private void ReadPalettedRle < TPixel > ( BufferedReadStream stream , int width , int height , Buffer2D < TPixel > pixels , Span < byte > palette , int colorMapPixelSizeInBytes , TgaImageOrigin origin )
where TPixel : unmanaged , IPixel < TPixel >
{
using ( IMemoryOwner < byte > buffer = this . memoryAllocator . Allocate < byte > ( width * height , AllocationOptions . Clean ) )
{
TPixel color = default ;
Span < byte > bufferSpan = buffer . GetSpan ( ) ;
this . UncompressRle ( width , height , bufferSpan , bytesPerPixel : 1 ) ;
using IMemoryOwner < byte > buffer = this . memoryAllocator . Allocate < byte > ( width * height , AllocationOptions . Clean ) ;
TPixel color = default ;
Span < byte > bufferSpan = buffer . GetSpan ( ) ;
this . UncompressRle ( stream , width , height , bufferSpan , bytesPerPixel : 1 ) ;
for ( int y = 0 ; y < height ; y + + )
for ( int y = 0 ; y < height ; y + + )
{
int newY = InvertY ( y , height , origin ) ;
Span < TPixel > pixelRow = pixels . DangerousGetRowSpan ( newY ) ;
int rowStartIdx = y * width ;
for ( int x = 0 ; x < width ; x + + )
{
int newY = InvertY ( y , height , origin ) ;
Span < TPixel > pixelRow = pixels . DangerousGetRowSpan ( newY ) ;
int rowStartIdx = y * width ;
for ( int x = 0 ; x < width ; x + + )
int idx = rowStartIdx + x ;
switch ( colorMapPixelSizeInBytes )
{
int idx = rowStartIdx + x ;
switch ( colorMapPixelSizeInBytes )
{
case 1 :
color . FromL8 ( Unsafe . As < byte , L8 > ( ref palette [ bufferSpan [ idx ] * colorMapPixelSizeInBytes ] ) ) ;
break ;
case 2 :
this . ReadPalettedBgra16Pixel ( palette , bufferSpan [ idx ] , colorMapPixelSizeInBytes , ref color ) ;
break ;
case 3 :
color . FromBgr24 ( Unsafe . As < byte , Bgr24 > ( ref palette [ bufferSpan [ idx ] * colorMapPixelSizeInBytes ] ) ) ;
break ;
case 4 :
color . FromBgra32 ( Unsafe . As < byte , Bgra32 > ( ref palette [ bufferSpan [ idx ] * colorMapPixelSizeInBytes ] ) ) ;
break ;
}
int newX = InvertX ( x , width , origin ) ;
pixelRow [ newX ] = color ;
case 1 :
color . FromL8 ( Unsafe . As < byte , L8 > ( ref palette [ bufferSpan [ idx ] * colorMapPixelSizeInBytes ] ) ) ;
break ;
case 2 :
this . ReadPalettedBgra16Pixel ( palette , bufferSpan [ idx ] , colorMapPixelSizeInBytes , ref color ) ;
break ;
case 3 :
color . FromBgr24 ( Unsafe . As < byte , Bgr24 > ( ref palette [ bufferSpan [ idx ] * colorMapPixelSizeInBytes ] ) ) ;
break ;
case 4 :
color . FromBgra32 ( Unsafe . As < byte , Bgra32 > ( ref palette [ bufferSpan [ idx ] * colorMapPixelSizeInBytes ] ) ) ;
break ;
}
int newX = InvertX ( x , width , origin ) ;
pixelRow [ newX ] = color ;
}
}
}
@ -349,11 +346,12 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
/// Reads a uncompressed monochrome TGA image.
/// </summary>
/// <typeparam name="TPixel">The pixel type.</typeparam>
/// <param name="stream">The <see cref="BufferedReadStream"/> containing image data.</param>
/// <param name="width">The width of the image.</param>
/// <param name="height">The height of the image.</param>
/// <param name="pixels">The <see cref="Buffer2D{TPixel}"/> to assign the palette to.</param>
/// <param name="origin">the image origin.</param>
private void ReadMonoChrome < TPixel > ( int width , int height , Buffer2D < TPixel > pixels , TgaImageOrigin origin )
private void ReadMonoChrome < TPixel > ( BufferedReadStream stream , int width , int height , Buffer2D < TPixel > pixels , TgaImageOrigin origin )
where TPixel : unmanaged , IPixel < TPixel >
{
bool invertX = InvertX ( origin ) ;
@ -366,7 +364,7 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
Span < TPixel > pixelSpan = pixels . DangerousGetRowSpan ( newY ) ;
for ( int x = width - 1 ; x > = 0 ; x - - )
{
this . ReadL8Pixel ( color , x , pixelSpan ) ;
ReadL8Pixel ( stream , color , x , pixelSpan ) ;
}
}
@ -380,14 +378,14 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
{
for ( int y = height - 1 ; y > = 0 ; y - - )
{
this . ReadL8Row ( width , pixels , rowSpan , y ) ;
this . ReadL8Row ( stream , width , pixels , rowSpan , y ) ;
}
}
else
{
for ( int y = 0 ; y < height ; y + + )
{
this . ReadL8Row ( width , pixels , rowSpan , y ) ;
this . ReadL8Row ( stream , width , pixels , rowSpan , y ) ;
}
}
}
@ -396,11 +394,12 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
/// Reads a uncompressed TGA image where each pixels has 16 bit.
/// </summary>
/// <typeparam name="TPixel">The pixel type.</typeparam>
/// <param name="stream">The <see cref="BufferedReadStream"/> containing image data.</param>
/// <param name="width">The width of the image.</param>
/// <param name="height">The height of the image.</param>
/// <param name="pixels">The <see cref="Buffer2D{TPixel}"/> to assign the palette to.</param>
/// <param name="origin">The image origin.</param>
private void ReadBgra16 < TPixel > ( int width , int height , Buffer2D < TPixel > pixels , TgaImageOrigin origin )
private void ReadBgra16 < TPixel > ( BufferedReadStream stream , int width , int height , Buffer2D < TPixel > pixels , TgaImageOrigin origin )
where TPixel : unmanaged , IPixel < TPixel >
{
TPixel color = default ;
@ -417,7 +416,7 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
{
for ( int x = width - 1 ; x > = 0 ; x - - )
{
int bytesRead = this . currentS tream. Read ( this . scratchBuffer , 0 , 2 ) ;
int bytesRead = s tream. Read ( this . scratchBuffer , 0 , 2 ) ;
if ( bytesRead ! = 2 )
{
TgaThrowHelper . ThrowInvalidImageContentException ( "Not enough data to read a pixel row" ) ;
@ -442,7 +441,7 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
}
else
{
int bytesRead = this . currentS tream. Read ( rowSpan ) ;
int bytesRead = s tream. Read ( rowSpan ) ;
if ( bytesRead ! = rowSpan . Length )
{
TgaThrowHelper . ThrowInvalidImageContentException ( "Not enough data to read a pixel row" ) ;
@ -473,11 +472,12 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
/// Reads a uncompressed TGA image where each pixels has 24 bit.
/// </summary>
/// <typeparam name="TPixel">The pixel type.</typeparam>
/// <param name="stream">The <see cref="BufferedReadStream"/> containing image data.</param>
/// <param name="width">The width of the image.</param>
/// <param name="height">The height of the image.</param>
/// <param name="pixels">The <see cref="Buffer2D{TPixel}"/> to assign the palette to.</param>
/// <param name="origin">The image origin.</param>
private void ReadBgr24 < TPixel > ( int width , int height , Buffer2D < TPixel > pixels , TgaImageOrigin origin )
private void ReadBgr24 < TPixel > ( BufferedReadStream stream , int width , int height , Buffer2D < TPixel > pixels , TgaImageOrigin origin )
where TPixel : unmanaged , IPixel < TPixel >
{
bool invertX = InvertX ( origin ) ;
@ -490,7 +490,7 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
Span < TPixel > pixelSpan = pixels . DangerousGetRowSpan ( newY ) ;
for ( int x = width - 1 ; x > = 0 ; x - - )
{
this . ReadBgr24Pixel ( color , x , pixelSpan ) ;
this . ReadBgr24Pixel ( stream , color , x , pixelSpan ) ;
}
}
@ -505,14 +505,14 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
{
for ( int y = height - 1 ; y > = 0 ; y - - )
{
this . ReadBgr24Row ( width , pixels , rowSpan , y ) ;
this . ReadBgr24Row ( stream , width , pixels , rowSpan , y ) ;
}
}
else
{
for ( int y = 0 ; y < height ; y + + )
{
this . ReadBgr24Row ( width , pixels , rowSpan , y ) ;
this . ReadBgr24Row ( stream , width , pixels , rowSpan , y ) ;
}
}
}
@ -521,15 +521,19 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
/// Reads a uncompressed TGA image where each pixels has 32 bit.
/// </summary>
/// <typeparam name="TPixel">The pixel type.</typeparam>
/// <param name="stream">The <see cref="BufferedReadStream"/> containing image data.</param>
/// <param name="width">The width of the image.</param>
/// <param name="height">The height of the image.</param>
/// <param name="pixels">The <see cref="Buffer2D{TPixel}"/> to assign the palette to.</param>
/// <param name="origin">The image origin.</param>
private void ReadBgra32 < TPixel > ( int width , int height , Buffer2D < TPixel > pixels , TgaImageOrigin origin )
private void ReadBgra32 < TPixel > ( BufferedReadStream stream , int width , int height , Buffer2D < TPixel > pixels , TgaImageOrigin origin )
where TPixel : unmanaged , IPixel < TPixel >
{
TPixel color = default ;
bool invertX = InvertX ( origin ) ;
Guard . NotNull ( this . tgaMetadata ) ;
if ( this . tgaMetadata . AlphaChannelBits = = 8 & & ! invertX )
{
using IMemoryOwner < byte > row = this . memoryAllocator . AllocatePaddedPixelRowBuffer ( width , 4 , 0 ) ;
@ -539,14 +543,14 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
{
for ( int y = height - 1 ; y > = 0 ; y - - )
{
this . ReadBgra32Row ( width , pixels , rowSpan , y ) ;
this . ReadBgra32Row ( stream , width , pixels , rowSpan , y ) ;
}
}
else
{
for ( int y = 0 ; y < height ; y + + )
{
this . ReadBgra32Row ( width , pixels , rowSpan , y ) ;
this . ReadBgra32Row ( stream , width , pixels , rowSpan , y ) ;
}
}
@ -561,14 +565,14 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
{
for ( int x = width - 1 ; x > = 0 ; x - - )
{
this . ReadBgra32Pixel ( x , color , pixelRow ) ;
this . ReadBgra32Pixel ( stream , x , color , pixelRow ) ;
}
}
else
{
for ( int x = 0 ; x < width ; x + + )
{
this . ReadBgra32Pixel ( x , color , pixelRow ) ;
this . ReadBgra32Pixel ( stream , x , color , pixelRow ) ;
}
}
}
@ -578,70 +582,72 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
/// Reads a run length encoded TGA image.
/// </summary>
/// <typeparam name="TPixel">The pixel type.</typeparam>
/// <param name="stream">The <see cref="BufferedReadStream"/> containing image data.</param>
/// <param name="width">The width of the image.</param>
/// <param name="height">The height of the image.</param>
/// <param name="pixels">The <see cref="Buffer2D{TPixel}"/> to assign the palette to.</param>
/// <param name="bytesPerPixel">The bytes per pixel.</param>
/// <param name="origin">The image origin.</param>
private void ReadRle < TPixel > ( int width , int height , Buffer2D < TPixel > pixels , int bytesPerPixel , TgaImageOrigin origin )
private void ReadRle < TPixel > ( BufferedReadStream stream , int width , int height , Buffer2D < TPixel > pixels , int bytesPerPixel , TgaImageOrigin origin )
where TPixel : unmanaged , IPixel < TPixel >
{
TPixel color = default ;
Guard . NotNull ( this . tgaMetadata ) ;
byte alphaBits = this . tgaMetadata . AlphaChannelBits ;
using ( IMemoryOwner < byte > buffer = this . memoryAllocator . Allocate < byte > ( width * height * bytesPerPixel , AllocationOptions . Clean ) )
using IMemoryOwner < byte > buffer = this . memoryAllocator . Allocate < byte > ( width * height * bytesPerPixel , AllocationOptions . Clean ) ;
Span < byte > bufferSpan = buffer . GetSpan ( ) ;
this . UncompressRle ( stream , width , height , bufferSpan , bytesPerPixel ) ;
for ( int y = 0 ; y < height ; y + + )
{
Span < byte > bufferSpan = buffer . GetSpan ( ) ;
this . UncompressRle ( width , height , bufferSpan , bytesPerPixel ) ;
for ( int y = 0 ; y < height ; y + + )
int newY = InvertY ( y , height , origin ) ;
Span < TPixel > pixelRow = pixels . DangerousGetRowSpan ( newY ) ;
int rowStartIdx = y * width * bytesPerPixel ;
for ( int x = 0 ; x < width ; x + + )
{
int newY = InvertY ( y , height , origin ) ;
Span < TPixel > pixelRow = pixels . DangerousGetRowSpan ( newY ) ;
int rowStartIdx = y * width * bytesPerPixel ;
for ( int x = 0 ; x < width ; x + + )
int idx = rowStartIdx + ( x * bytesPerPixel ) ;
switch ( bytesPerPixel )
{
int idx = rowStartIdx + ( x * bytesPerPixel ) ;
switch ( bytesPerPixel )
{
case 1 :
color . FromL8 ( Unsafe . As < byte , L8 > ( ref bufferSpan [ idx ] ) ) ;
break ;
case 2 :
if ( ! this . hasAlpha )
{
// Set alpha value to 1, to treat it as opaque for Bgra5551.
bufferSpan [ idx + 1 ] = ( byte ) ( bufferSpan [ idx + 1 ] | 1 2 8 ) ;
}
if ( this . fileHeader . ImageType = = TgaImageType . RleBlackAndWhite )
{
color . FromLa16 ( Unsafe . As < byte , La16 > ( ref bufferSpan [ idx ] ) ) ;
}
else
{
color . FromBgra5551 ( Unsafe . As < byte , Bgra5551 > ( ref bufferSpan [ idx ] ) ) ;
}
break ;
case 3 :
color . FromBgr24 ( Unsafe . As < byte , Bgr24 > ( ref bufferSpan [ idx ] ) ) ;
break ;
case 4 :
if ( this . hasAlpha )
{
color . FromBgra32 ( Unsafe . As < byte , Bgra32 > ( ref bufferSpan [ idx ] ) ) ;
}
else
{
byte alpha = alphaBits = = 0 ? byte . MaxValue : bufferSpan [ idx + 3 ] ;
color . FromBgra32 ( new Bgra32 ( bufferSpan [ idx + 2 ] , bufferSpan [ idx + 1 ] , bufferSpan [ idx ] , alpha ) ) ;
}
break ;
}
case 1 :
color . FromL8 ( Unsafe . As < byte , L8 > ( ref bufferSpan [ idx ] ) ) ;
break ;
case 2 :
if ( ! this . hasAlpha )
{
// Set alpha value to 1, to treat it as opaque for Bgra5551.
bufferSpan [ idx + 1 ] = ( byte ) ( bufferSpan [ idx + 1 ] | 1 2 8 ) ;
}
if ( this . fileHeader . ImageType = = TgaImageType . RleBlackAndWhite )
{
color . FromLa16 ( Unsafe . As < byte , La16 > ( ref bufferSpan [ idx ] ) ) ;
}
else
{
color . FromBgra5551 ( Unsafe . As < byte , Bgra5551 > ( ref bufferSpan [ idx ] ) ) ;
}
int newX = InvertX ( x , width , origin ) ;
pixelRow [ newX ] = color ;
break ;
case 3 :
color . FromBgr24 ( Unsafe . As < byte , Bgr24 > ( ref bufferSpan [ idx ] ) ) ;
break ;
case 4 :
if ( this . hasAlpha )
{
color . FromBgra32 ( Unsafe . As < byte , Bgra32 > ( ref bufferSpan [ idx ] ) ) ;
}
else
{
byte alpha = alphaBits = = 0 ? byte . MaxValue : bufferSpan [ idx + 3 ] ;
color . FromBgra32 ( new Bgra32 ( bufferSpan [ idx + 2 ] , bufferSpan [ idx + 1 ] , bufferSpan [ idx ] , alpha ) ) ;
}
break ;
}
int newX = InvertX ( x , width , origin ) ;
pixelRow [ newX ] = color ;
}
}
}
@ -658,10 +664,10 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private void ReadL8Row < TPixel > ( int width , Buffer2D < TPixel > pixels , Span < byte > row , int y )
private void ReadL8Row < TPixel > ( BufferedReadStream stream , int width , Buffer2D < TPixel > pixels , Span < byte > row , int y )
where TPixel : unmanaged , IPixel < TPixel >
{
int bytesRead = this . currentS tream. Read ( row ) ;
int bytesRead = s tream. Read ( row ) ;
if ( bytesRead ! = row . Length )
{
TgaThrowHelper . ThrowInvalidImageContentException ( "Not enough data to read a pixel row" ) ;
@ -672,19 +678,19 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private void ReadL8Pixel < TPixel > ( TPixel color , int x , Span < TPixel > pixelSpan )
private static void ReadL8Pixel < TPixel > ( BufferedReadStream stream , TPixel color , int x , Span < TPixel > pixelSpan )
where TPixel : unmanaged , IPixel < TPixel >
{
byte pixelValue = ( byte ) this . currentS tream. ReadByte ( ) ;
byte pixelValue = ( byte ) s tream. ReadByte ( ) ;
color . FromL8 ( Unsafe . As < byte , L8 > ( ref pixelValue ) ) ;
pixelSpan [ x ] = color ;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private void ReadBgr24Pixel < TPixel > ( TPixel color , int x , Span < TPixel > pixelSpan )
private void ReadBgr24Pixel < TPixel > ( BufferedReadStream stream , TPixel color , int x , Span < TPixel > pixelSpan )
where TPixel : unmanaged , IPixel < TPixel >
{
int bytesRead = this . currentS tream. Read ( this . scratchBuffer , 0 , 3 ) ;
int bytesRead = s tream. Read ( this . scratchBuffer , 0 , 3 ) ;
if ( bytesRead ! = 3 )
{
TgaThrowHelper . ThrowInvalidImageContentException ( "Not enough data to read a bgr pixel" ) ;
@ -695,10 +701,10 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private void ReadBgr24Row < TPixel > ( int width , Buffer2D < TPixel > pixels , Span < byte > row , int y )
private void ReadBgr24Row < TPixel > ( BufferedReadStream stream , int width , Buffer2D < TPixel > pixels , Span < byte > row , int y )
where TPixel : unmanaged , IPixel < TPixel >
{
int bytesRead = this . currentS tream. Read ( row ) ;
int bytesRead = s tream. Read ( row ) ;
if ( bytesRead ! = row . Length )
{
TgaThrowHelper . ThrowInvalidImageContentException ( "Not enough data to read a pixel row" ) ;
@ -709,25 +715,27 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private void ReadBgra32Pixel < TPixel > ( int x , TPixel color , Span < TPixel > pixelRow )
private void ReadBgra32Pixel < TPixel > ( BufferedReadStream stream , int x , TPixel color , Span < TPixel > pixelRow )
where TPixel : unmanaged , IPixel < TPixel >
{
int bytesRead = this . currentS tream. Read ( this . scratchBuffer , 0 , 4 ) ;
int bytesRead = s tream. Read ( this . scratchBuffer , 0 , 4 ) ;
if ( bytesRead ! = 4 )
{
TgaThrowHelper . ThrowInvalidImageContentException ( "Not enough data to read a bgra pixel" ) ;
}
Guard . NotNull ( this . tgaMetadata ) ;
byte alpha = this . tgaMetadata . AlphaChannelBits = = 0 ? byte . MaxValue : this . scratchBuffer [ 3 ] ;
color . FromBgra32 ( new Bgra32 ( this . scratchBuffer [ 2 ] , this . scratchBuffer [ 1 ] , this . scratchBuffer [ 0 ] , alpha ) ) ;
pixelRow [ x ] = color ;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private void ReadBgra32Row < TPixel > ( int width , Buffer2D < TPixel > pixels , Span < byte > row , int y )
private void ReadBgra32Row < TPixel > ( BufferedReadStream stream , int width , Buffer2D < TPixel > pixels , Span < byte > row , int y )
where TPixel : unmanaged , IPixel < TPixel >
{
int bytesRead = this . currentS tream. Read ( row ) ;
int bytesRead = s tream. Read ( row ) ;
if ( bytesRead ! = row . Length )
{
TgaThrowHelper . ThrowInvalidImageContentException ( "Not enough data to read a pixel row" ) ;
@ -738,10 +746,10 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private void ReadPalettedBgra16Pixel < TPixel > ( Span < byte > palette , int colorMapPixelSizeInBytes , int x , TPixel color , Span < TPixel > pixelRow )
private void ReadPalettedBgra16Pixel < TPixel > ( BufferedReadStream stream , Span < byte > palette , int colorMapPixelSizeInBytes , int x , TPixel color , Span < TPixel > pixelRow )
where TPixel : unmanaged , IPixel < TPixel >
{
int colorIndex = this . currentS tream. ReadByte ( ) ;
int colorIndex = s tream. ReadByte ( ) ;
if ( colorIndex = = - 1 )
{
TgaThrowHelper . ThrowInvalidImageContentException ( "Not enough data to read color index" ) ;
@ -768,10 +776,10 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private void ReadPalettedBgr24Pixel < TPixel > ( Span < byte > palette , int colorMapPixelSizeInBytes , int x , TPixel color , Span < TPixel > pixelRow )
private static void ReadPalettedBgr24Pixel < TPixel > ( BufferedReadStream stream , Span < byte > palette , int colorMapPixelSizeInBytes , int x , TPixel color , Span < TPixel > pixelRow )
where TPixel : unmanaged , IPixel < TPixel >
{
int colorIndex = this . currentS tream. ReadByte ( ) ;
int colorIndex = s tream. ReadByte ( ) ;
if ( colorIndex = = - 1 )
{
TgaThrowHelper . ThrowInvalidImageContentException ( "Not enough data to read color index" ) ;
@ -782,10 +790,10 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private void ReadPalettedBgra32Pixel < TPixel > ( Span < byte > palette , int colorMapPixelSizeInBytes , int x , TPixel color , Span < TPixel > pixelRow )
private static void ReadPalettedBgra32Pixel < TPixel > ( BufferedReadStream stream , Span < byte > palette , int colorMapPixelSizeInBytes , int x , TPixel color , Span < TPixel > pixelRow )
where TPixel : unmanaged , IPixel < TPixel >
{
int colorIndex = this . currentS tream. ReadByte ( ) ;
int colorIndex = s tream. ReadByte ( ) ;
if ( colorIndex = = - 1 )
{
TgaThrowHelper . ThrowInvalidImageContentException ( "Not enough data to read color index" ) ;
@ -798,25 +806,26 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
/// <summary>
/// Produce uncompressed tga data from a run length encoded stream.
/// </summary>
/// <param name="stream">The <see cref="BufferedReadStream"/> containing image data.</param>
/// <param name="width">The width of the image.</param>
/// <param name="height">The height of the image.</param>
/// <param name="buffer">Buffer for uncompressed data.</param>
/// <param name="bytesPerPixel">The bytes used per pixel.</param>
private void UncompressRle ( int width , int height , Span < byte > buffer , int bytesPerPixel )
private void UncompressRle ( BufferedReadStream stream , int width , int height , Span < byte > buffer , int bytesPerPixel )
{
int uncompressedPixels = 0 ;
Span < byte > pixel = this . scratchBuffer . AsSpan ( 0 , bytesPerPixel ) ;
int totalPixels = width * height ;
while ( uncompressedPixels < totalPixels )
{
byte runLengthByte = ( byte ) this . currentS tream. ReadByte ( ) ;
byte runLengthByte = ( byte ) s tream. ReadByte ( ) ;
// The high bit of a run length packet is set to 1.
int highBit = runLengthByte > > 7 ;
if ( highBit = = 1 )
{
int runLength = runLengthByte & 1 2 7 ;
int bytesRead = this . currentS tream. Read ( pixel , 0 , bytesPerPixel ) ;
int bytesRead = s tream. Read ( pixel , 0 , bytesPerPixel ) ;
if ( bytesRead ! = bytesPerPixel )
{
TgaThrowHelper . ThrowInvalidImageContentException ( "Not enough data to read a pixel from the stream" ) ;
@ -836,7 +845,7 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
int bufferIdx = uncompressedPixels * bytesPerPixel ;
for ( int i = 0 ; i < runLength + 1 ; i + + , uncompressedPixels + + )
{
int bytesRead = this . currentS tream. Read ( pixel , 0 , bytesPerPixel ) ;
int bytesRead = s tream. Read ( pixel , 0 , bytesPerPixel ) ;
if ( bytesRead ! = bytesPerPixel )
{
TgaThrowHelper . ThrowInvalidImageContentException ( "Not enough data to read a pixel from the stream" ) ;
@ -917,13 +926,13 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
/// </summary>
/// <param name="stream">The <see cref="BufferedReadStream"/> containing image data.</param>
/// <returns>The image origin.</returns>
[MemberNotNull(nameof(metadata))]
[MemberNotNull(nameof(tgaMetadata))]
private TgaImageOrigin ReadFileHeader ( BufferedReadStream stream )
{
this . currentStream = stream ;
Span < byte > buffer = stackalloc byte [ TgaFileHeader . Size ] ;
this . currentS tream. Read ( buffer , 0 , TgaFileHeader . Size ) ;
s tream. Read ( buffer , 0 , TgaFileHeader . Size ) ;
this . fileHeader = TgaFileHeader . Parse ( buffer ) ;
this . metadata = new ImageMetadata ( ) ;
this . tgaMetadata = this . metadata . GetTgaMetadata ( ) ;
@ -939,7 +948,6 @@ internal sealed class TgaDecoderCore : IImageDecoderInternals
this . hasAlpha = alphaBits > 0 ;
// Bits 4 and 5 describe the image origin.
var origin = ( TgaImageOrigin ) ( ( this . fileHeader . ImageDescriptor & 0x30 ) > > 4 ) ;
return origin ;
return ( TgaImageOrigin ) ( ( this . fileHeader . ImageDescriptor & 0x30 ) > > 4 ) ;
}
}
Ildar Khayrutdinov
3 years ago