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Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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source-engine/public/pixelwriter.h

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//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
// $NoKeywords: $
//
//===========================================================================//
#ifndef PIXELWRITER_H
#define PIXELWRITER_H
#ifdef _WIN32
#pragma once
#endif
#ifdef _WIN32
#define FORCEINLINE_PIXEL FORCEINLINE
#elif POSIX
#define FORCEINLINE_PIXEL inline
#else
#error "implement me"
#endif
#include "bitmap/imageformat.h"
#include "tier0/dbg.h"
#include "mathlib/compressed_vector.h"
#include "mathlib/ssemath.h"
//-----------------------------------------------------------------------------
// Color writing class
//-----------------------------------------------------------------------------
class CPixelWriter
{
public:
FORCEINLINE void SetPixelMemory( ImageFormat format, void* pMemory, int stride );
FORCEINLINE void *GetPixelMemory() { return m_pBase; }
// this is no longer used:
#if 0 // defined( _X360 )
// set after SetPixelMemory()
FORCEINLINE void ActivateByteSwapping( bool bSwap );
#endif
FORCEINLINE void Seek( int x, int y ) RESTRICT;
FORCEINLINE void* SkipBytes( int n ) RESTRICT;
FORCEINLINE void SkipPixels( int n );
FORCEINLINE void WritePixel( int r, int g, int b, int a = 255 );
FORCEINLINE void WritePixelNoAdvance( int r, int g, int b, int a = 255 ) RESTRICT;
FORCEINLINE void WritePixelSigned( int r, int g, int b, int a = 255 );
FORCEINLINE void WritePixelNoAdvanceSigned( int r, int g, int b, int a = 255 );
FORCEINLINE void ReadPixelNoAdvance( int &r, int &g, int &b, int &a );
// Floating point formats
FORCEINLINE void WritePixelNoAdvanceF( float r, float g, float b, float a = 1.0f ) RESTRICT;
FORCEINLINE void WritePixelF( float r, float g, float b, float a = 1.0f );
// SIMD formats
FORCEINLINE void WritePixel( FLTX4 rgba ) RESTRICT;
FORCEINLINE void WritePixelNoAdvance( FLTX4 rgba );
#ifdef _X360
// here are some explicit formats so we can avoid the switch:
FORCEINLINE void WritePixelNoAdvance_RGBA8888( FLTX4 rgba );
FORCEINLINE void WritePixelNoAdvance_BGRA8888( FLTX4 rgba );
// as above, but with m_pBits passed in to avoid a LHS
FORCEINLINE void WritePixelNoAdvance_BGRA8888( FLTX4 rgba, void *pBits ) RESTRICT;
// for writing entire SIMD registers at once when they have
// already been packed, and when m_pBits is vector-aligned
// (which is a requirement for write-combined memory)
// offset is added to m_pBits (saving you from the obligatory
// LHS of a SkipBytes)
FORCEINLINE void WriteFourPixelsExplicitLocation_BGRA8888( FLTX4 rgba, int offset );
#endif
FORCEINLINE unsigned char GetPixelSize() RESTRICT { return m_Size; }
FORCEINLINE bool IsUsingFloatFormat() RESTRICT const;
FORCEINLINE unsigned char *GetCurrentPixel() { return m_pBits; }
private:
enum
{
PIXELWRITER_USING_FLOAT_FORMAT = 0x01,
PIXELWRITER_USING_16BIT_FLOAT_FORMAT = 0x02,
PIXELWRITER_SWAPBYTES = 0x04,
};
unsigned char* m_pBase;
unsigned char* m_pBits;
unsigned short m_BytesPerRow;
unsigned char m_Size;
unsigned char m_nFlags;
signed short m_RShift;
signed short m_GShift;
signed short m_BShift;
signed short m_AShift;
unsigned int m_RMask;
unsigned int m_GMask;
unsigned int m_BMask;
unsigned int m_AMask;
#ifdef _X360
ImageFormat m_Format;
public:
inline const ImageFormat &GetFormat() { return m_Format; }
private:
#endif
};
FORCEINLINE_PIXEL bool CPixelWriter::IsUsingFloatFormat() RESTRICT const
{
return (m_nFlags & PIXELWRITER_USING_FLOAT_FORMAT) != 0;
}
FORCEINLINE_PIXEL void CPixelWriter::SetPixelMemory( ImageFormat format, void* pMemory, int stride )
{
m_pBits = (unsigned char*)pMemory;
m_pBase = m_pBits;
m_BytesPerRow = (unsigned short)stride;
m_nFlags = 0;
#ifdef _X360
m_Format = format;
#endif
switch ( format )
{
case IMAGE_FORMAT_R32F: // NOTE! : the low order bits are first in this naming convention.
m_Size = 4;
m_RShift = 0;
m_GShift = 0;
m_BShift = 0;
m_AShift = 0;
m_RMask = 0xFFFFFFFF;
m_GMask = 0x0;
m_BMask = 0x0;
m_AMask = 0x0;
m_nFlags |= PIXELWRITER_USING_FLOAT_FORMAT;
break;
case IMAGE_FORMAT_RGBA32323232F:
m_Size = 16;
m_RShift = 0;
m_GShift = 32;
m_BShift = 64;
m_AShift = 96;
m_RMask = 0xFFFFFFFF;
m_GMask = 0xFFFFFFFF;
m_BMask = 0xFFFFFFFF;
m_AMask = 0xFFFFFFFF;
m_nFlags |= PIXELWRITER_USING_FLOAT_FORMAT;
break;
case IMAGE_FORMAT_RGBA16161616F:
m_Size = 8;
m_RShift = 0;
m_GShift = 16;
m_BShift = 32;
m_AShift = 48;
m_RMask = 0xFFFF;
m_GMask = 0xFFFF;
m_BMask = 0xFFFF;
m_AMask = 0xFFFF;
m_nFlags |= PIXELWRITER_USING_FLOAT_FORMAT | PIXELWRITER_USING_16BIT_FLOAT_FORMAT;
break;
case IMAGE_FORMAT_RGBA8888:
#if defined( _X360 )
case IMAGE_FORMAT_LINEAR_RGBA8888:
#endif
m_Size = 4;
m_RShift = 0;
m_GShift = 8;
m_BShift = 16;
m_AShift = 24;
m_RMask = 0xFF;
m_GMask = 0xFF;
m_BMask = 0xFF;
m_AMask = 0xFF;
break;
case IMAGE_FORMAT_BGRA8888: // NOTE! : the low order bits are first in this naming convention.
#if defined( _X360 )
case IMAGE_FORMAT_LINEAR_BGRA8888:
#endif
m_Size = 4;
m_RShift = 16;
m_GShift = 8;
m_BShift = 0;
m_AShift = 24;
m_RMask = 0xFF;
m_GMask = 0xFF;
m_BMask = 0xFF;
m_AMask = 0xFF;
break;
case IMAGE_FORMAT_BGRX8888:
#if defined( _X360 )
case IMAGE_FORMAT_LINEAR_BGRX8888:
#endif
m_Size = 4;
m_RShift = 16;
m_GShift = 8;
m_BShift = 0;
m_AShift = 24;
m_RMask = 0xFF;
m_GMask = 0xFF;
m_BMask = 0xFF;
m_AMask = 0x00;
break;
case IMAGE_FORMAT_BGRA4444:
m_Size = 2;
m_RShift = 4;
m_GShift = 0;
m_BShift = -4;
m_AShift = 8;
m_RMask = 0xF0;
m_GMask = 0xF0;
m_BMask = 0xF0;
m_AMask = 0xF0;
break;
case IMAGE_FORMAT_BGR888:
m_Size = 3;
m_RShift = 16;
m_GShift = 8;
m_BShift = 0;
m_AShift = 0;
m_RMask = 0xFF;
m_GMask = 0xFF;
m_BMask = 0xFF;
m_AMask = 0x00;
break;
case IMAGE_FORMAT_BGR565:
m_Size = 2;
m_RShift = 8;
m_GShift = 3;
m_BShift = -3;
m_AShift = 0;
m_RMask = 0xF8;
m_GMask = 0xFC;
m_BMask = 0xF8;
m_AMask = 0x00;
break;
case IMAGE_FORMAT_BGRA5551:
case IMAGE_FORMAT_BGRX5551:
m_Size = 2;
m_RShift = 7;
m_GShift = 2;
m_BShift = -3;
m_AShift = 8;
m_RMask = 0xF8;
m_GMask = 0xF8;
m_BMask = 0xF8;
m_AMask = 0x80;
break;
// GR - alpha format for HDR support
case IMAGE_FORMAT_A8:
m_Size = 1;
m_RShift = 0;
m_GShift = 0;
m_BShift = 0;
m_AShift = 0;
m_RMask = 0x00;
m_GMask = 0x00;
m_BMask = 0x00;
m_AMask = 0xFF;
break;
case IMAGE_FORMAT_UVWQ8888:
m_Size = 4;
m_RShift = 0;
m_GShift = 8;
m_BShift = 16;
m_AShift = 24;
m_RMask = 0xFF;
m_GMask = 0xFF;
m_BMask = 0xFF;
m_AMask = 0xFF;
break;
case IMAGE_FORMAT_RGBA16161616:
#if defined( _X360 )
case IMAGE_FORMAT_LINEAR_RGBA16161616:
#endif
m_Size = 8;
if ( !IsX360() )
{
m_RShift = 0;
m_GShift = 16;
m_BShift = 32;
m_AShift = 48;
}
else
{
m_RShift = 48;
m_GShift = 32;
m_BShift = 16;
m_AShift = 0;
}
m_RMask = 0xFFFF;
m_GMask = 0xFFFF;
m_BMask = 0xFFFF;
m_AMask = 0xFFFF;
break;
case IMAGE_FORMAT_I8:
// whatever goes into R is considered the intensity.
m_Size = 1;
m_RShift = 0;
m_GShift = 0;
m_BShift = 0;
m_AShift = 0;
m_RMask = 0xFF;
m_GMask = 0x00;
m_BMask = 0x00;
m_AMask = 0x00;
break;
case IMAGE_FORMAT_RGB888:
m_Size = 3;
m_RShift = 0;
m_GShift = 8;
m_BShift = 16;
m_AShift = 0;
m_RMask = 0xFF;
m_GMask = 0xFF;
m_BMask = 0xFF;
m_AMask = 0x0;
break;
// FIXME: Add more color formats as need arises
default:
{
static bool format_error_printed[NUM_IMAGE_FORMATS];
if ( !format_error_printed[format] )
{
Assert( 0 );
Msg( "CPixelWriter::SetPixelMemory: Unsupported image format %i\n", format );
format_error_printed[format] = true;
}
m_Size = 0; // set to zero so that we don't stomp memory for formats that we don't understand.
m_RShift = 0;
m_GShift = 0;
m_BShift = 0;
m_AShift = 0;
m_RMask = 0x00;
m_GMask = 0x00;
m_BMask = 0x00;
m_AMask = 0x00;
}
break;
}
}
#if 0 // defined( _X360 )
FORCEINLINE void CPixelWriter::ActivateByteSwapping( bool bSwap )
{
// X360TBD: Who is trying to use this?
// Purposely not hooked up because PixelWriter has been ported to read/write native pixels only
Assert( 0 );
if ( bSwap && !(m_nFlags & PIXELWRITER_SWAPBYTES ) )
{
m_nFlags |= PIXELWRITER_SWAPBYTES;
// only tested with 4 byte formats
Assert( m_Size == 4 );
}
else if ( !bSwap && (m_nFlags & PIXELWRITER_SWAPBYTES ) )
{
m_nFlags &= ~PIXELWRITER_SWAPBYTES;
}
else
{
// same state
return;
}
// swap the shifts
m_RShift = 24-m_RShift;
m_GShift = 24-m_GShift;
m_BShift = 24-m_BShift;
m_AShift = 24-m_AShift;
}
#endif
//-----------------------------------------------------------------------------
// Sets where we're writing to
//-----------------------------------------------------------------------------
FORCEINLINE_PIXEL void CPixelWriter::Seek( int x, int y ) RESTRICT
{
m_pBits = m_pBase + y * m_BytesPerRow + x * m_Size;
}
//-----------------------------------------------------------------------------
// Skips n bytes:
//-----------------------------------------------------------------------------
FORCEINLINE_PIXEL void* CPixelWriter::SkipBytes( int n ) RESTRICT
{
m_pBits += n;
return m_pBits;
}
//-----------------------------------------------------------------------------
// Skips n pixels:
//-----------------------------------------------------------------------------
FORCEINLINE_PIXEL void CPixelWriter::SkipPixels( int n )
{
SkipBytes( n * m_Size );
}
//-----------------------------------------------------------------------------
// Writes a pixel without advancing the index PC ONLY
//-----------------------------------------------------------------------------
FORCEINLINE_PIXEL void CPixelWriter::WritePixelNoAdvanceF( float r, float g, float b, float a ) RESTRICT
{
Assert( IsUsingFloatFormat() );
// X360TBD: Not ported
Assert( IsPC() );
if (PIXELWRITER_USING_16BIT_FLOAT_FORMAT & m_nFlags)
{
float16 fp16[4];
fp16[0].SetFloat( r );
fp16[1].SetFloat( g );
fp16[2].SetFloat( b );
fp16[3].SetFloat( a );
// fp16
unsigned short pBuf[4] = { 0, 0, 0, 0 };
pBuf[ m_RShift >> 4 ] |= (fp16[0].GetBits() & m_RMask) << ( m_RShift & 0xF );
pBuf[ m_GShift >> 4 ] |= (fp16[1].GetBits() & m_GMask) << ( m_GShift & 0xF );
pBuf[ m_BShift >> 4 ] |= (fp16[2].GetBits() & m_BMask) << ( m_BShift & 0xF );
pBuf[ m_AShift >> 4 ] |= (fp16[3].GetBits() & m_AMask) << ( m_AShift & 0xF );
memcpy( m_pBits, pBuf, m_Size );
}
else
{
// fp32
int pBuf[4] = { 0, 0, 0, 0 };
pBuf[ m_RShift >> 5 ] |= (FloatBits(r) & m_RMask) << ( m_RShift & 0x1F );
pBuf[ m_GShift >> 5 ] |= (FloatBits(g) & m_GMask) << ( m_GShift & 0x1F );
pBuf[ m_BShift >> 5 ] |= (FloatBits(b) & m_BMask) << ( m_BShift & 0x1F );
pBuf[ m_AShift >> 5 ] |= (FloatBits(a) & m_AMask) << ( m_AShift & 0x1F );
memcpy( m_pBits, pBuf, m_Size );
}
}
//-----------------------------------------------------------------------------
// Writes a pixel, advances the write index
//-----------------------------------------------------------------------------
FORCEINLINE_PIXEL void CPixelWriter::WritePixelF( float r, float g, float b, float a )
{
WritePixelNoAdvanceF(r, g, b, a);
m_pBits += m_Size;
}
//-----------------------------------------------------------------------------
// Writes a pixel, advances the write index
//-----------------------------------------------------------------------------
FORCEINLINE_PIXEL void CPixelWriter::WritePixel( int r, int g, int b, int a )
{
WritePixelNoAdvance(r,g,b,a);
m_pBits += m_Size;
}
//-----------------------------------------------------------------------------
// Writes a pixel, advances the write index
//-----------------------------------------------------------------------------
FORCEINLINE_PIXEL void CPixelWriter::WritePixelSigned( int r, int g, int b, int a )
{
WritePixelNoAdvanceSigned(r,g,b,a);
m_pBits += m_Size;
}
//-----------------------------------------------------------------------------
// Writes a pixel without advancing the index
//-----------------------------------------------------------------------------
FORCEINLINE_PIXEL void CPixelWriter::WritePixelNoAdvance( int r, int g, int b, int a ) RESTRICT
{
Assert( !IsUsingFloatFormat() );
if ( m_Size <= 0 )
{
return;
}
if ( m_Size < 5 )
{
unsigned int val = (r & m_RMask) << m_RShift;
val |= (g & m_GMask) << m_GShift;
val |= (m_BShift > 0) ? ((b & m_BMask) << m_BShift) : ((b & m_BMask) >> -m_BShift);
val |= (a & m_AMask) << m_AShift;
switch( m_Size )
{
default:
Assert( 0 );
return;
case 1:
{
m_pBits[0] = (unsigned char)((val & 0xff));
return;
}
case 2:
{
((unsigned short *)m_pBits)[0] = (unsigned short)((val & 0xffff));
return;
}
case 3:
{
if ( IsPC() || !IsX360() )
{
((unsigned char *)m_pBits)[0] = (unsigned char)((val & 0xffff));
m_pBits[2] = (unsigned char)((val >> 16) & 0xff);
}
else
{
m_pBits[0] = (unsigned char)(((val >> 16) & 0xff));
m_pBits[1] = (unsigned char)(((val >> 8 ) & 0xff));
m_pBits[2] = (unsigned char)(val & 0xff);
}
return;
}
case 4:
{
((unsigned int *)m_pBits)[0] = val;
return;
}
}
}
else // RGBA32323232 or RGBA16161616 -- PC only.
{
AssertMsg(!IsX360(), "Unsupported lightmap format used in WritePixelNoAdvance(). This is a severe performance fault.\n");
int64 val = ( ( int64 )(r & m_RMask) ) << m_RShift;
val |= ( ( int64 )(g & m_GMask) ) << m_GShift;
val |= (m_BShift > 0) ? ((( int64 )( b & m_BMask)) << m_BShift) : (((int64)( b & m_BMask)) >> -m_BShift);
val |= ( ( int64 )(a & m_AMask) ) << m_AShift;
switch( m_Size )
{
case 6:
{
if ( IsPC() || !IsX360() )
{
((unsigned int *)m_pBits)[0] = val & 0xffffffff;
((unsigned short *)m_pBits)[2] = (unsigned short)( ( val >> 32 ) & 0xffff );
}
else
{
((unsigned int *)m_pBits)[0] = (val >> 16) & 0xffffffff;
((unsigned short *)m_pBits)[2] = (unsigned short)( val & 0xffff );
}
return;
}
case 8:
{
if ( IsPC() || !IsX360() )
{
((unsigned int *)m_pBits)[0] = val & 0xffffffff;
((unsigned int *)m_pBits)[1] = ( val >> 32 ) & 0xffffffff;
}
else
{
((unsigned int *)m_pBits)[0] = ( val >> 32 ) & 0xffffffff;
((unsigned int *)m_pBits)[1] = val & 0xffffffff;
}
return;
}
default:
Assert( 0 );
return;
}
}
}
#ifdef _X360
// There isn't a PC port of these because of the many varied
// pixel formats the PC deals with. If you write SSE versions
// of all the various necessary packers, then this can be made
// to work on PC.
//-----------------------------------------------------------------------------
// Writes a pixel, advances the write index
//-----------------------------------------------------------------------------
FORCEINLINE_PIXEL void CPixelWriter::WritePixel( FLTX4 rgba ) RESTRICT
{
WritePixelNoAdvance(rgba);
m_pBits += m_Size;
}
//-----------------------------------------------------------------------------
// Writes a pixel without advancing the index
// rgba are four float values, each on the range 0..255 (though they may leak
// fractionally over 255 due to numerical errors earlier)
//-----------------------------------------------------------------------------
FORCEINLINE_PIXEL void CPixelWriter::WritePixelNoAdvance( FLTX4 rgba ) RESTRICT
{
Assert( !IsUsingFloatFormat() );
switch (m_Size)
{
case 0:
return;
case 4:
{
AssertMsg((reinterpret_cast<unsigned int>(m_pBits) & 0x03) == 0,"Unaligned m_pBits in WritePixelNoAdvance!");
switch ( m_Format )
{
// note: format names are low-order-byte first.
case IMAGE_FORMAT_RGBA8888:
case IMAGE_FORMAT_LINEAR_RGBA8888:
WritePixelNoAdvance_RGBA8888(rgba);
break;
case IMAGE_FORMAT_BGRA8888: // NOTE! : the low order bits are first in this naming convention.
case IMAGE_FORMAT_LINEAR_BGRA8888:
WritePixelNoAdvance_BGRA8888(rgba);
break;
default:
AssertMsg1(false, "Unknown four-byte pixel format %d in lightmap write.\n", m_Format);
}
break;
}
default:
AssertMsg1(false, "WritePixelNoAdvance on unsupported 360 %d-byte format\n", m_Size);
break;
}
}
// here are some explicit formats so we can avoid the switch:
FORCEINLINE void CPixelWriter::WritePixelNoAdvance_RGBA8888( FLTX4 rgba )
{
// it's easier to do tiered convert-saturates here
// than the d3d color convertor op
// first permute
const static fltx4 permReverse = XMVectorPermuteControl(3,2,1,0);
fltx4 N = XMVectorPermute(rgba, rgba, permReverse);
N = __vctuxs(N, 0); // convert to unsigned fixed point 0 w/ saturate
N = __vpkuwus(N, N); // convert to halfword saturate
N = __vpkuhus(N, N); // convert to byte saturate
N = __vspltw(N, 0); // splat w-word to all four
__stvewx(N, m_pBits, 0); // store whatever word happens to be aligned with m_pBits to that word
}
FORCEINLINE void CPixelWriter::WritePixelNoAdvance_BGRA8888( FLTX4 rgba )
{
WritePixelNoAdvance_BGRA8888( rgba, m_pBits );
}
FORCEINLINE void CPixelWriter::WritePixelNoAdvance_BGRA8888( FLTX4 rgba, void * RESTRICT pBits ) RESTRICT
{
// this happens to be in an order such that we can use the handy builtin packing op
// clamp to 0..255 (coz it might have leaked over)
static const fltx4 vTwoFiftyFive = {255.0f, 255.0f, 255.0f, 255.0f};
fltx4 N = MinSIMD(vTwoFiftyFive, rgba);
// the magic number such that when mul-accummulated against rbga,
// gets us a representation 3.0 + (r)*2^-22 -- puts the bits at
// the bottom of the float
static CONST XMVECTOR PackScale = { (1.0f / (FLOAT)(1 << 22)), (1.0f / (FLOAT)(1 << 22)), (1.0f / (FLOAT)(1 << 22)), (1.0f / (FLOAT)(1 << 22))}; // 255.0f / (FLOAT)(1 << 22)
static const XMVECTOR Three = {3.0f, 3.0f, 3.0f, 3.0f};
N = __vmaddfp(N, PackScale, Three);
N = __vpkd3d(N, N, VPACK_D3DCOLOR, VPACK_32, 3); // pack to X word
N = __vspltw(N, 0); // splat X
// this is a nasty thing to work around the April XDK bug in __stvewx
{
void * RESTRICT copyOfPBits = pBits;
__stvewx(N, copyOfPBits, 0);
}
}
// for writing entire SIMD registers at once
FORCEINLINE void CPixelWriter::WriteFourPixelsExplicitLocation_BGRA8888 ( FLTX4 rgba, int offset )
{
Assert( (reinterpret_cast<unsigned int>(m_pBits) & 15) == 0 ); // assert alignment
XMStoreVector4A( m_pBits + offset , rgba );
}
#endif
//-----------------------------------------------------------------------------
// Writes a signed pixel without advancing the index
//-----------------------------------------------------------------------------
FORCEINLINE_PIXEL void CPixelWriter::WritePixelNoAdvanceSigned( int r, int g, int b, int a )
{
Assert( !IsUsingFloatFormat() );
if ( m_Size <= 0 )
{
return;
}
if ( m_Size < 5 )
{
int val = (r & m_RMask) << m_RShift;
val |= (g & m_GMask) << m_GShift;
val |= (m_BShift > 0) ? ((b & m_BMask) << m_BShift) : ((b & m_BMask) >> -m_BShift);
val |= (a & m_AMask) << m_AShift;
signed char *pSignedBits = (signed char *)m_pBits;
if ( IsPC() || !IsX360() )
{
switch ( m_Size )
{
case 4:
pSignedBits[3] = (signed char)((val >> 24) & 0xff);
// fall through intentionally.
case 3:
pSignedBits[2] = (signed char)((val >> 16) & 0xff);
// fall through intentionally.
case 2:
pSignedBits[1] = (signed char)((val >> 8) & 0xff);
// fall through intentionally.
case 1:
pSignedBits[0] = (signed char)((val & 0xff));
// fall through intentionally.
return;
}
}
else
{
switch ( m_Size )
{
case 4:
pSignedBits[0] = (signed char)((val >> 24) & 0xff);
pSignedBits[1] = (signed char)((val >> 16) & 0xff);
pSignedBits[2] = (signed char)((val >> 8) & 0xff);
pSignedBits[3] = (signed char)(val & 0xff);
break;
case 3:
pSignedBits[0] = (signed char)((val >> 16) & 0xff);
pSignedBits[1] = (signed char)((val >> 8) & 0xff);
pSignedBits[2] = (signed char)(val & 0xff);
break;
case 2:
pSignedBits[0] = (signed char)((val >> 8) & 0xff);
pSignedBits[1] = (signed char)(val & 0xff);
break;
case 1:
pSignedBits[0] = (signed char)(val & 0xff);
break;
}
}
}
else
{
int64 val = ( ( int64 )(r & m_RMask) ) << m_RShift;
val |= ( ( int64 )(g & m_GMask) ) << m_GShift;
val |= (m_BShift > 0) ? ((( int64 )( b & m_BMask)) << m_BShift) : (((int64)( b & m_BMask)) >> -m_BShift);
val |= ( ( int64 )(a & m_AMask) ) << m_AShift;
signed char *pSignedBits = ( signed char * )m_pBits;
if ( IsPC() || !IsX360() )
{
switch( m_Size )
{
case 8:
pSignedBits[7] = (signed char)((val >> 56) & 0xff);
pSignedBits[6] = (signed char)((val >> 48) & 0xff);
// fall through intentionally.
case 6:
pSignedBits[5] = (signed char)((val >> 40) & 0xff);
pSignedBits[4] = (signed char)((val >> 32) & 0xff);
// fall through intentionally.
case 4:
pSignedBits[3] = (signed char)((val >> 24) & 0xff);
// fall through intentionally.
case 3:
pSignedBits[2] = (signed char)((val >> 16) & 0xff);
// fall through intentionally.
case 2:
pSignedBits[1] = (signed char)((val >> 8) & 0xff);
// fall through intentionally.
case 1:
pSignedBits[0] = (signed char)((val & 0xff));
break;
default:
Assert( 0 );
return;
}
}
else
{
switch( m_Size )
{
case 8:
pSignedBits[0] = (signed char)((val >> 56) & 0xff);
pSignedBits[1] = (signed char)((val >> 48) & 0xff);
pSignedBits[2] = (signed char)((val >> 40) & 0xff);
pSignedBits[3] = (signed char)((val >> 32) & 0xff);
pSignedBits[4] = (signed char)((val >> 24) & 0xff);
pSignedBits[5] = (signed char)((val >> 16) & 0xff);
pSignedBits[6] = (signed char)((val >> 8) & 0xff);
pSignedBits[7] = (signed char)(val & 0xff);
break;
case 6:
pSignedBits[0] = (signed char)((val >> 40) & 0xff);
pSignedBits[1] = (signed char)((val >> 32) & 0xff);
pSignedBits[2] = (signed char)((val >> 24) & 0xff);
pSignedBits[3] = (signed char)((val >> 16) & 0xff);
pSignedBits[4] = (signed char)((val >> 8) & 0xff);
pSignedBits[5] = (signed char)(val & 0xff);
break;
case 4:
pSignedBits[0] = (signed char)((val >> 24) & 0xff);
pSignedBits[1] = (signed char)((val >> 16) & 0xff);
pSignedBits[2] = (signed char)((val >> 8) & 0xff);
pSignedBits[3] = (signed char)(val & 0xff);
break;
case 3:
pSignedBits[0] = (signed char)((val >> 16) & 0xff);
pSignedBits[1] = (signed char)((val >> 8) & 0xff);
pSignedBits[2] = (signed char)(val & 0xff);
break;
case 2:
pSignedBits[0] = (signed char)((val >> 8) & 0xff);
pSignedBits[1] = (signed char)(val & 0xff);
break;
case 1:
pSignedBits[0] = (signed char)(val & 0xff);
break;
default:
Assert( 0 );
return;
}
}
}
}
FORCEINLINE_PIXEL void CPixelWriter::ReadPixelNoAdvance( int &r, int &g, int &b, int &a )
{
Assert( !IsUsingFloatFormat() );
int val = m_pBits[0];
if ( m_Size > 1 )
{
if ( IsPC() || !IsX360() )
{
val |= (int)m_pBits[1] << 8;
if ( m_Size > 2 )
{
val |= (int)m_pBits[2] << 16;
if ( m_Size > 3 )
{
val |= (int)m_pBits[3] << 24;
}
}
}
else
{
val <<= 8;
val |= (int)m_pBits[1];
if ( m_Size > 2 )
{
val <<= 8;
val |= (int)m_pBits[2];
if ( m_Size > 3 )
{
val <<= 8;
val |= (int)m_pBits[3];
}
}
}
}
r = (val>>m_RShift) & m_RMask;
g = (val>>m_GShift) & m_GMask;
b = (val>>m_BShift) & m_BMask;
a = (val>>m_AShift) & m_AMask;
}
#endif // PIXELWRITER_H;