d4708
/
source-engine
mirror of https://github.com/nillerusr/source-engine.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity
Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
255 Commits
25 Branches
6 Tags
221 MiB
Tree: 50ff9922a6
Branches Tags
${ item.name }
Create tag ${ searchTerm }
Create branch ${ searchTerm }
from '50ff9922a6'
${ noResults }
source-engine/bitmap/tgaloader.cpp

1002 lines
27 KiB
Raw Normal View History Unescape

1
5 years ago
//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
//=============================================================================//
#include <stdio.h>
#include "bitmap/tgaloader.h"
#include "tier0/dbg.h"
#include "basetypes.h"
#include <math.h>
#include "tier1/utlvector.h"
#include "tier1/utlbuffer.h"
#include "filesystem.h"
#include "tier2/tier2.h"
// memdbgon must be the last include file in a .cpp file!!!
#include "tier0/memdbgon.h"
namespace TGALoader
{
//-----------------------------------------------------------------------------
// Format of the TGA header on disk
//-----------------------------------------------------------------------------
#pragma pack (1)
struct TGAHeader_t
{
unsigned char id_length;
unsigned char colormap_type;
unsigned char image_type;
unsigned short colormap_index;
unsigned short colormap_length;
unsigned char colormap_size;
unsigned short x_origin;
unsigned short y_origin;
unsigned short width;
unsigned short height;
unsigned char pixel_size;
unsigned char attributes;
};
//-----------------------------------------------------------------------------
// read a row into an RGBA8888 array.
//-----------------------------------------------------------------------------
typedef void (*ReadRowFunc_t)( CUtlBuffer& buf, TGAHeader_t const& header, unsigned char* pDstMemory );
//-----------------------------------------------------------------------------
// output a RGBA8888 row into the destination format.
//-----------------------------------------------------------------------------
typedef void (*OutputRowFunc_t)( CUtlBuffer& buf, TGAHeader_t const& header, unsigned char* pDstMemory );
//-----------------------------------------------------------------------------
// Important constants
//-----------------------------------------------------------------------------
#define TGA_MAX_COLORMAP_SIZE ( 256 * 4 )
#define TGA_MAX_ROW_LENGTH_IN_PIXELS IMAGE_MAX_DIM
//-----------------------------------------------------------------------------
// Globals... blech
//-----------------------------------------------------------------------------
static unsigned char g_ColorMap[TGA_MAX_COLORMAP_SIZE];
// run-length state from row to row for RLE images
static bool g_IsRunLengthPacket;
static int g_PixelsLeftInPacket;
static unsigned char g_SrcGammaTable[256];
static unsigned char g_DstGammaTable[256];
typedef CUtlMemory<unsigned char> CTempImage;
//-----------------------------------------------------------------------------
// Reads in a file, sticks it into a UtlVector
//-----------------------------------------------------------------------------
static bool ReadFile( char const* pFileName, CTempImage& image, int maxbytes = -1 )
{
Assert( pFileName );
Assert( g_pFullFileSystem );
if( !g_pFullFileSystem )
{
return false;
}
FileHandle_t fileHandle;
fileHandle = g_pFullFileSystem->Open( pFileName, "rb" );
if( !fileHandle )
return false;
// How big is the file?
long pos;
if (maxbytes < 0)
{
pos = g_pFullFileSystem->Size( fileHandle );
}
else
{
pos = maxbytes;
}
// Allocate enough space
image.EnsureCapacity( pos );
// Back to the start of the file
g_pFullFileSystem->Seek( fileHandle, 0, FILESYSTEM_SEEK_HEAD );
// Read the file into the vector memory
int len = g_pFullFileSystem->Read( image.Base(), pos, fileHandle );
// Close the file
g_pFullFileSystem->Close( fileHandle );
// It's an error if we didn't read in enough goodies
return len == pos;
}
//-----------------------------------------------------------------------------
// Reads in the TGA Header
//-----------------------------------------------------------------------------
static void ReadHeader( CUtlBuffer& buf, TGAHeader_t& header )
{
buf.Get( &header, sizeof(TGAHeader_t) );
}
//-----------------------------------------------------------------------------
// Figures out TGA information
//-----------------------------------------------------------------------------
bool GetInfo( CUtlBuffer& buf, int *width, int *height,
ImageFormat *imageFormat, float *sourceGamma )
{
TGAHeader_t header;
ReadHeader( buf, header );
switch( header.image_type )
{
case 1: // 8 bit uncompressed TGA image
case 3: // 8 bit monochrome uncompressed TGA image
case 9: // 8 bit compressed TGA image
*imageFormat = IMAGE_FORMAT_I8;
break;
case 2: // 24/32 bit uncompressed TGA image
case 10: // 24/32 bit compressed TGA image
if( header.pixel_size == 32 )
{
*imageFormat = IMAGE_FORMAT_ABGR8888;
}
else if( header.pixel_size == 24 )
{
*imageFormat = IMAGE_FORMAT_BGR888;
}
else
{
return false;
}
break;
default:
return false;
break;
}
*width = header.width;
*height = header.height;
*sourceGamma = ARTWORK_GAMMA;
return true;
}
//-----------------------------------------------------------------------------
// Returns the minimum amount you have to load to get information about the TGA file
//-----------------------------------------------------------------------------
int TGAHeaderSize()
{
return sizeof( TGAHeader_t );
}
//-----------------------------------------------------------------------------
// Gets info about a TGA file
//-----------------------------------------------------------------------------
bool GetInfo( char const* pFileName, int *width, int *height,
ImageFormat *imageFormat, float *sourceGamma )
{
// temporary memory
CTempImage image;
// try to read in the file
if (!ReadFile( pFileName, image, sizeof(TGAHeader_t) ))
return false;
// Serialization buffer
CUtlBuffer buf( image.Base(), image.NumAllocated(), CUtlBuffer::READ_ONLY );
return GetInfo( buf, width, height, imageFormat, sourceGamma );
}
//-----------------------------------------------------------------------------
// Various output methods
//-----------------------------------------------------------------------------
void OutputRowRGBA8888( CUtlBuffer& buf, TGAHeader_t const& header, unsigned char* pDst )
{
for( int i = 0; i < header.width; ++i, pDst += 4 )
{
unsigned char* pSrc = (unsigned char*)buf.PeekGet();
pDst[0] = pSrc[0];
pDst[1] = pSrc[1];
pDst[2] = pSrc[2];
pDst[3] = pSrc[3];
buf.SeekGet( CUtlBuffer::SEEK_CURRENT, 4 );
}
}
void OutputRowABGR8888( CUtlBuffer& buf, TGAHeader_t const& header, unsigned char* pDst )
{
for( int i = 0; i < header.width; ++i, pDst += 4 )
{
unsigned char* pSrc = (unsigned char*)buf.PeekGet();
pDst[3] = pSrc[0];
pDst[2] = pSrc[1];
pDst[1] = pSrc[2];
pDst[0] = pSrc[3];
buf.SeekGet( CUtlBuffer::SEEK_CURRENT, 4 );
}
}
void OutputRowRGB888( CUtlBuffer& buf, TGAHeader_t const& header, unsigned char* pDst )
{
for( int i = 0; i < header.width; ++i, pDst += 3 )
{
unsigned char* pSrc = (unsigned char*)buf.PeekGet();
pDst[0] = pSrc[0];
pDst[1] = pSrc[1];
pDst[2] = pSrc[2];
buf.SeekGet( CUtlBuffer::SEEK_CURRENT, 4 );
}
}
void OutputRowBGR888( CUtlBuffer& buf, TGAHeader_t const& header, unsigned char* pDst )
{
for( int i = 0; i < header.width; ++i, pDst += 3 )
{
unsigned char* pSrc = (unsigned char*)buf.PeekGet();
pDst[2] = pSrc[0];
pDst[1] = pSrc[1];
pDst[0] = pSrc[2];
buf.SeekGet( CUtlBuffer::SEEK_CURRENT, 4 );
}
}
void OutputRowRGB565( CUtlBuffer& buf, TGAHeader_t const& header, unsigned char* pDst )
{
Assert( 0 );
}
void OutputRowI8( CUtlBuffer& buf, TGAHeader_t const& header, unsigned char* pDst )
{
for( int i = 0; i < header.width; ++i, ++pDst )
{
unsigned char* pSrc = (unsigned char*)buf.PeekGet();
if( ( pSrc[0] == pSrc[1] ) && ( pSrc[1] == pSrc[2] ) )
{
pDst[0] = pSrc[0];
}
else
{
pDst[0] = ( unsigned char )( 0.299f * pSrc[0] + 0.587f * pSrc[1] + 0.114f * pSrc[2] );
}
buf.SeekGet( CUtlBuffer::SEEK_CURRENT, 4 );
}
}
void OutputRowIA88( CUtlBuffer& buf, TGAHeader_t const& header, unsigned char* pDst )
{
for( int i = 0; i < header.width; ++i, pDst += 2 )
{
unsigned char* pSrc = (unsigned char*)buf.PeekGet();
if( ( pSrc[0] == pSrc[1] ) && ( pSrc[1] == pSrc[2] ) )
{
pDst[0] = pSrc[0];
}
else
{
pDst[0] = ( unsigned char )( 0.299f * pSrc[0] + 0.587f * pSrc[1] + 0.114f * pSrc[2] );
}
pDst[1] = pSrc[3];
buf.SeekGet( CUtlBuffer::SEEK_CURRENT, 4 );
}
}
void OutputRowA8( CUtlBuffer& buf, TGAHeader_t const& header, unsigned char* pDst )
{
for( int i = 0; i < header.width; ++i, ++pDst )
{
unsigned char* pSrc = (unsigned char*)buf.PeekGet();
pDst[0] = pSrc[3];
buf.SeekGet( CUtlBuffer::SEEK_CURRENT, 4 );
}
}
void OutputRowRGB888BlueScreen( CUtlBuffer& buf, TGAHeader_t const& header, unsigned char* pDst )
{
for( int i = 0; i < header.width; ++i, pDst += 3 )
{
unsigned char* pSrc = (unsigned char*)buf.PeekGet();
pDst[0] = (unsigned char)(( ( int )pSrc[0] * ( int )pSrc[3] ) >> 8);
pDst[1] = (unsigned char)(( ( int )pSrc[1] * ( int )pSrc[3] ) >> 8);
pDst[2] = (( ( ( ( int )pSrc[2] * ( int )pSrc[3] ) ) >> 8 ) + ( 255 - pSrc[3] ));
buf.SeekGet( CUtlBuffer::SEEK_CURRENT, 4 );
}
}
void OutputRowBGR888BlueScreen( CUtlBuffer& buf, TGAHeader_t const& header, unsigned char* pDst )
{
for( int i = 0; i < header.width; ++i, pDst += 3 )
{
unsigned char* pSrc = (unsigned char*)buf.PeekGet();
pDst[2] = (unsigned char)(( ( int )pSrc[0] * ( int )pSrc[3] ) >> 8);
pDst[1] = (unsigned char)(( ( int )pSrc[1] * ( int )pSrc[3] ) >> 8);
pDst[0] = (unsigned char)(( ( ( ( int )pSrc[2] * ( int )pSrc[3] ) ) >> 8 ) + ( 255 - pSrc[3] ));
buf.SeekGet( CUtlBuffer::SEEK_CURRENT, 4 );
}
}
void OutputRowARGB8888( CUtlBuffer& buf, TGAHeader_t const& header, unsigned char* pDst )
{
for( int i = 0; i < header.width; ++i, pDst += 4 )
{
unsigned char* pSrc = (unsigned char*)buf.PeekGet();
pDst[0] = pSrc[3];
pDst[1] = pSrc[0];
pDst[2] = pSrc[1];
pDst[3] = pSrc[2];
buf.SeekGet( CUtlBuffer::SEEK_CURRENT, 4 );
}
}
void OutputRowBGRA8888( CUtlBuffer& buf, TGAHeader_t const& header, unsigned char* pDst )
{
for( int i = 0; i < header.width; ++i, pDst += 4 )
{
unsigned char* pSrc = (unsigned char*)buf.PeekGet();
pDst[0] = pSrc[2];
pDst[1] = pSrc[1];
pDst[2] = pSrc[0];
pDst[3] = pSrc[3];
buf.SeekGet( CUtlBuffer::SEEK_CURRENT, 4 );
}
}
void OutputRowBGRX8888( CUtlBuffer& buf, TGAHeader_t const& header, unsigned char* pDst )
{
for( int i = 0; i < header.width; ++i, pDst += 4 )
{
unsigned char* pSrc = (unsigned char*)buf.PeekGet();
pDst[0] = pSrc[2];
pDst[1] = pSrc[1];
pDst[2] = pSrc[0];
pDst[3] = 255;
buf.SeekGet( CUtlBuffer::SEEK_CURRENT, 4 );
}
}
void OutputRowBGR565( CUtlBuffer& buf, TGAHeader_t const& header, unsigned char* pDst )
{
for( int i = 0; i < header.width; ++i, pDst += 2 )
{
unsigned char* pSrc = (unsigned char*)buf.PeekGet();
unsigned short rgba = (pSrc[2] & 0x1F) | ((pSrc[1] & 0x3F) << 5) |
((pSrc[0] & 0x1F) << 11);
pDst[0] = rgba & 0xFF;
pDst[1] = rgba >> 8;
buf.SeekGet( CUtlBuffer::SEEK_CURRENT, 4 );
}
}
void OutputRowBGRX5551( CUtlBuffer& buf, TGAHeader_t const& header, unsigned char* pDst )
{
for( int i = 0; i < header.width; ++i, pDst += 2 )
{
unsigned char* pSrc = (unsigned char*)buf.PeekGet();
unsigned short rgba = (pSrc[2] & 0x1F) | ((pSrc[1] & 0x1F) << 5) |
((pSrc[0] & 0x1F) << 10) | 0x8000;
pDst[0] = rgba & 0xFF;
pDst[1] = rgba >> 8;
buf.SeekGet( CUtlBuffer::SEEK_CURRENT, 4 );
}
}
static OutputRowFunc_t GetOutputRowFunc( ImageFormat imageFormat )
{
switch( imageFormat )
{
case IMAGE_FORMAT_RGBA8888:
return &OutputRowRGBA8888;
case IMAGE_FORMAT_ABGR8888:
return &OutputRowABGR8888;
case IMAGE_FORMAT_RGB888:
return &OutputRowRGB888;
case IMAGE_FORMAT_BGR888:
return &OutputRowBGR888;
case IMAGE_FORMAT_RGB565:
return &OutputRowRGB565;
case IMAGE_FORMAT_I8:
return &OutputRowI8;
case IMAGE_FORMAT_IA88:
return &OutputRowIA88;
case IMAGE_FORMAT_A8:
return &OutputRowA8;
case IMAGE_FORMAT_RGB888_BLUESCREEN:
return &OutputRowRGB888BlueScreen;
case IMAGE_FORMAT_BGR888_BLUESCREEN:
return &OutputRowBGR888BlueScreen;
case IMAGE_FORMAT_ARGB8888:
return &OutputRowARGB8888;
case IMAGE_FORMAT_BGRA8888:
return &OutputRowBGRA8888;
case IMAGE_FORMAT_BGRX8888:
return &OutputRowBGRX8888;
case IMAGE_FORMAT_BGR565:
return &OutputRowBGR565;
case IMAGE_FORMAT_BGRX5551:
return &OutputRowBGRX5551;
#ifdef _X360
case IMAGE_FORMAT_LINEAR_RGB888:
return &OutputRowRGB888;
case IMAGE_FORMAT_LINEAR_BGR888:
return &OutputRowBGR888;
#endif
default:
return NULL;
break;
}
}
#if 0
static void InitSourceGammaConversionTable( float srcGamma )
{
static float lastSrcGamma = -1;
if (lastSrcGamma == srcGamma)
return;
lastSrcGamma = srcGamma;
ImageLoader::ConstructGammaTable( g_SrcGammaTable, srcGamma, 1.0f );
}
static void InitDestGammaConversionTable( float dstGamma )
{
static float lastDstGamma = -1;
if (lastDstGamma == dstGamma)
return;
lastDstGamma = dstGamma;
ImageLoader::ConstructGammaTable( g_DstGammaTable, 1.0f, dstGamma );
}
#endif
//-----------------------------------------------------------------------------
// Reads an 8-bit palettized TGA image
//-----------------------------------------------------------------------------
void ReadRow8BitUncompressedWithColormap( CUtlBuffer& buf,
TGAHeader_t const& header, unsigned char* pDst )
{
int i;
unsigned char* colormapEntry;
switch( header.colormap_size )
{
case 8:
for( i = 0; i < header.width; ++i, pDst += 4 )
{
int pal = buf.GetUnsignedChar();
colormapEntry = &g_ColorMap[pal];
pDst[0] = colormapEntry[0];
pDst[1] = colormapEntry[0];
pDst[2] = colormapEntry[0];
pDst[3] = 255;
}
break;
case 24:
for( i = 0; i < header.width; ++i, pDst += 4 )
{
int pal = buf.GetUnsignedChar();
colormapEntry = &g_ColorMap[pal * 3];
pDst[0] = colormapEntry[2];
pDst[1] = colormapEntry[1];
pDst[2] = colormapEntry[0];
pDst[3] = 255;
}
break;
case 32:
for( i = 0; i < header.width; ++i, pDst += 4 )
{
int pal = buf.GetUnsignedChar();
colormapEntry = &g_ColorMap[pal * 4];
pDst[0] = colormapEntry[3];
pDst[1] = colormapEntry[2];
pDst[2] = colormapEntry[1];
pDst[3] = colormapEntry[0];
}
break;
default:
Assert( 0 );
break;
}
}
//-----------------------------------------------------------------------------
// Reads an 8-bit greyscale TGA image
//-----------------------------------------------------------------------------
void ReadRow8BitUncompressedWithoutColormap( CUtlBuffer& buf,
TGAHeader_t const& header, unsigned char* pDst )
{
for( int i = 0; i < header.width; ++i, pDst += 4 )
{
pDst[0] = pDst[1] = pDst[2] = buf.GetUnsignedChar();
pDst[3] = 255;
}
}
//-----------------------------------------------------------------------------
// Reads a 24-bit TGA image
//-----------------------------------------------------------------------------
void ReadRow24BitUncompressedWithoutColormap( CUtlBuffer& buf,
TGAHeader_t const& header, unsigned char* pDst )
{
for( int i = 0; i < header.width; ++i, pDst += 4 )
{
pDst[2] = buf.GetUnsignedChar();
pDst[1] = buf.GetUnsignedChar();
pDst[0] = buf.GetUnsignedChar();
pDst[3] = 255;
}
}
//-----------------------------------------------------------------------------
// Reads a 32-bit TGA image
//-----------------------------------------------------------------------------
void ReadRow32BitUncompressedWithoutColormap( CUtlBuffer& buf,
TGAHeader_t const& header, unsigned char* pDst )
{
for( int i = 0; i < header.width; ++i, pDst += 4 )
{
pDst[2] = buf.GetUnsignedChar();
pDst[1] = buf.GetUnsignedChar();
pDst[0] = buf.GetUnsignedChar();
pDst[3] = buf.GetUnsignedChar();
}
}
//-----------------------------------------------------------------------------
// Decompresses a run-length encoded row of bytes
//-----------------------------------------------------------------------------
static void DecompressRow( CUtlBuffer& buf, TGAHeader_t const& header, unsigned char* pDst )
{
int bytesPerPixel = header.pixel_size >> 3;
int pixelsLeftInRow = header.width;
int numPixelsToProcess;
#ifdef DBGFLAG_ASSERT
unsigned char *pLast = pDst + header.width * bytesPerPixel;
#endif
unsigned char repeat[4] = {};
do
{
if( !g_PixelsLeftInPacket )
{
// start a new packet.
unsigned char packetHeader = buf.GetUnsignedChar();
g_PixelsLeftInPacket = 1 + ( packetHeader & 0x7f );
if( packetHeader & 0x80 )
{
g_IsRunLengthPacket = true;
// Read what I'm supposed to repeat
for (int i = 0; i < bytesPerPixel; ++i)
{
repeat[i] = buf.GetUnsignedChar();
}
}
else
{
g_IsRunLengthPacket = false;
}
}
// already in the middle of a packet of data.
numPixelsToProcess = g_PixelsLeftInPacket;
if( numPixelsToProcess > pixelsLeftInRow )
{
numPixelsToProcess = pixelsLeftInRow;
}
if( g_IsRunLengthPacket )
{
for( int i = numPixelsToProcess; --i >= 0; pDst += bytesPerPixel )
{
for (int j = 0; j < bytesPerPixel; ++j )
{
pDst[j] = repeat[j];
}
}
}
else
{
buf.Get( pDst, numPixelsToProcess * bytesPerPixel );
pDst += numPixelsToProcess * bytesPerPixel;
}
g_PixelsLeftInPacket -= numPixelsToProcess;
pixelsLeftInRow -= numPixelsToProcess;
} while( pixelsLeftInRow );
Assert( pDst == pLast );
}
//-----------------------------------------------------------------------------
// Reads a compressed 8-bit palettized TGA image
//-----------------------------------------------------------------------------
void ReadRow8BitCompressedWithColormap( CUtlBuffer& buf,
TGAHeader_t const& header, unsigned char* pDst )
{
unsigned char rowI_8[TGA_MAX_ROW_LENGTH_IN_PIXELS];
DecompressRow( buf, header, rowI_8 );
CUtlBuffer uncompressedBuf( rowI_8, TGA_MAX_ROW_LENGTH_IN_PIXELS, CUtlBuffer::READ_ONLY );
ReadRow8BitUncompressedWithColormap( uncompressedBuf, header, pDst );
}
//-----------------------------------------------------------------------------
// Reads a compressed 8-bit greyscale TGA image
//-----------------------------------------------------------------------------
void ReadRow8BitCompressedWithoutColormap( CUtlBuffer& buf,
TGAHeader_t const& header, unsigned char* pDst )
{
unsigned char rowI_8[TGA_MAX_ROW_LENGTH_IN_PIXELS];
DecompressRow( buf, header, rowI_8 );
CUtlBuffer uncompressedBuf( rowI_8, TGA_MAX_ROW_LENGTH_IN_PIXELS, CUtlBuffer::READ_ONLY );
ReadRow8BitUncompressedWithoutColormap( uncompressedBuf, header, pDst );
}
//-----------------------------------------------------------------------------
// Reads a compressed 24-bit TGA image
//-----------------------------------------------------------------------------
void ReadRow24BitCompressedWithoutColormap( CUtlBuffer& buf,
TGAHeader_t const& header, unsigned char* pDst )
{
unsigned char rowBGR_888[TGA_MAX_ROW_LENGTH_IN_PIXELS * 3];
DecompressRow( buf, header, rowBGR_888 );
CUtlBuffer uncompressedBuf( rowBGR_888, TGA_MAX_ROW_LENGTH_IN_PIXELS * 3, CUtlBuffer::READ_ONLY );
ReadRow24BitUncompressedWithoutColormap( uncompressedBuf, header, pDst );
}
//-----------------------------------------------------------------------------
// Reads a compressed 32-bit TGA image
//-----------------------------------------------------------------------------
void ReadRow32BitCompressedWithoutColormap( CUtlBuffer& buf,
TGAHeader_t const& header, unsigned char* pDst )
{
unsigned char rowBGRA_8888[TGA_MAX_ROW_LENGTH_IN_PIXELS << 2];
DecompressRow( buf, header, rowBGRA_8888 );
CUtlBuffer uncompressedBuf( rowBGRA_8888, TGA_MAX_ROW_LENGTH_IN_PIXELS << 2, CUtlBuffer::READ_ONLY );
ReadRow32BitUncompressedWithoutColormap( uncompressedBuf, header, pDst );
}
//-----------------------------------------------------------------------------
// Method used to read the TGA
//-----------------------------------------------------------------------------
static ReadRowFunc_t GetReadRowFunc( TGAHeader_t const& header )
{
switch( header.image_type )
{
case 1: // 8 bit uncompressed TGA image
case 3: // 8 bit monochrome uncompressed TGA image
if( header.colormap_length )
{
return &ReadRow8BitUncompressedWithColormap;
}
else
{
return &ReadRow8BitUncompressedWithoutColormap;
}
case 9: // 8 bit compressed TGA image
if( header.colormap_length )
{
return &ReadRow8BitCompressedWithColormap;
}
else
{
return &ReadRow8BitCompressedWithoutColormap;
}
case 2: // 24/32 bit uncompressed TGA image
switch( header.pixel_size )
{
case 24:
return &ReadRow24BitUncompressedWithoutColormap;
break;
case 32:
return &ReadRow32BitUncompressedWithoutColormap;
break;
default:
//Error( "unsupported tga colordepth: %d", TGAHeader_t.pixel_size" );
return 0;
break;
}
case 10: // 24/32 bit compressed TGA image
if( header.colormap_length )
{
// Error( "colormaps not support with 24/32 bit TGAs." );
return 0;
}
else
{
switch( header.pixel_size )
{
case 24:
return &ReadRow24BitCompressedWithoutColormap;
break;
case 32:
return &ReadRow32BitCompressedWithoutColormap;
break;
default:
//Error( "unsupported tga colordepth: %d", TGAHeader_t.pixel_size" );
return NULL;
break;
}
}
default:
// Error( "unsupported tga pixel format" );
return 0;
break;
}
}
//-----------------------------------------------------------------------------
// Reads the color map
//-----------------------------------------------------------------------------
static bool ReadColormap( CUtlBuffer& buf, TGAHeader_t const& header )
{
int numColormapBytes = header.colormap_length * ( header.colormap_size >> 3 );
if( numColormapBytes > TGA_MAX_COLORMAP_SIZE )
{
// Error( "colormap bigger than TGA_MAX_COLORMAP_SIZE" );
return false;
}
// read colormap
buf.Get( g_ColorMap, numColormapBytes );
return true;
}
//-----------------------------------------------------------------------------
// Reads the source image
//-----------------------------------------------------------------------------
static bool ReadSourceImage( CUtlBuffer& buf, TGAHeader_t& header, CTempImage& image )
{
// Figure out our reading and riting
ReadRowFunc_t ReadRowFunc = GetReadRowFunc( header );
if( !ReadRowFunc )
return false;
// HACK: Fixme: We really shouldn't be using globals here
// Init RLE vars
g_PixelsLeftInPacket = 0;
// Only allocate the memory once
int memRequired = ImageLoader::GetMemRequired( header.width, header.height, 1,
IMAGE_FORMAT_RGBA8888, false );
image.EnsureCapacity( memRequired );
// read each row and process it. Note the image is upside-down from
// the way we want it.
unsigned char* pDstBits;
// flip the image vertically if necessary.
if (header.attributes & 0x20)
{
for( int row = 0; row < header.height; ++row )
{
pDstBits = image.Base() +
row * header.width * ImageLoader::SizeInBytes(IMAGE_FORMAT_RGBA8888);
ReadRowFunc( buf, header, pDstBits );
}
}
else
{
for( int row = header.height; --row >= 0; )
{
pDstBits = image.Base() +
row * header.width * ImageLoader::SizeInBytes(IMAGE_FORMAT_RGBA8888);
ReadRowFunc( buf, header, pDstBits );
}
}
return true;
}
#if 0
//-----------------------------------------------------------------------------
// Outputs the final image
//-----------------------------------------------------------------------------
static bool OutputImage( CTempImage& image, TGAHeader_t& header,
ImageFormat imageFormat, unsigned char* pDst )
{
// How do we write?
OutputRowFunc_t OutputRowFunc = GetOutputRowFunc( imageFormat );
if( !OutputRowFunc )
return false;
CUtlBuffer buf( image.Base(), image.NumAllocated(), CUtlBuffer::READ_ONLY );
unsigned char* pDstBits;
for( int row = 0; row < header.height; ++row )
{
pDstBits = pDst +
row * header.width * ImageLoader::SizeInBytes(imageFormat);
OutputRowFunc( buf, header, pDstBits );
}
return true;
}
#endif
//-----------------------------------------------------------------------------
// Parses the lovely bits previously read from disk
//-----------------------------------------------------------------------------
bool Load( unsigned char *pOutputImage, CUtlBuffer& buf, int width,
int height, ImageFormat imageFormat, float targetGamma, bool mipmap )
{
TGAHeader_t header;
// Read the TGA header
ReadHeader( buf, header );
// skip TARGA image comment
if( header.id_length != 0 )
{
buf.SeekGet( CUtlBuffer::SEEK_CURRENT, header.id_length );
}
// Read the color map for palettized images
if( header.colormap_length != 0 )
{
if (!ReadColormap( buf, header ))
return false;
}
// Stores the RGBA8888 temp version of the image which we'll use to
// to do mipmapping...
CTempImage tmpImage;
if (!ReadSourceImage( buf, header, tmpImage ))
return false;
// Erg... what if header.width * header.height > width * height?
// Then don't do anything, this is an error condition...
if ((width * height) < (header.width * header.height))
return false;
// Now that we've got the source image, generate the mip-map levels
ImageLoader::GenerateMipmapLevels( tmpImage.Base(), pOutputImage,
header.width, header.height, 1, imageFormat, ARTWORK_GAMMA, targetGamma,
mipmap ? 0 : 1 );
return true;
}
//-----------------------------------------------------------------------------
// Reads a TGA image from a file
//-----------------------------------------------------------------------------
bool Load( unsigned char *pOutputImage, const char *pFileName, int width, int height,
ImageFormat imageFormat, float targetGamma, bool mipmap )
{
Assert( pOutputImage && pFileName );
// memory for the file
CTempImage vec;
// Read that puppy in!
if (!ReadFile( pFileName, vec ))
return false;
// Make an unserialization buffer
CUtlBuffer buf( vec.Base(), vec.NumAllocated(), CUtlBuffer::READ_ONLY );
// Do the dirty deed
return Load( pOutputImage, buf, width, height, imageFormat, targetGamma, mipmap );
}
//-----------------------------------------------------------------------------
// Creates a map in linear space
//-----------------------------------------------------------------------------
bool LoadRGBA8888( CUtlBuffer& buf, CUtlMemory<unsigned char> &outputData, int &outWidth, int &outHeight )
{
TGAHeader_t header;
// Read the TGA header
ReadHeader( buf, header );
// skip TARGA image comment
if( header.id_length != 0 )
{
buf.SeekGet( CUtlBuffer::SEEK_CURRENT, header.id_length );
}
// Read the color map for palettized images
if( header.colormap_length != 0 )
{
if (!ReadColormap( buf, header ))
return false;
}
// Stores the RGBA8888 temp version of the image which we'll use to
// to do mipmapping...
int memSize = ImageLoader::GetMemRequired(
header.width, header.height, 1, IMAGE_FORMAT_RGBA8888, false );
outputData.EnsureCapacity( memSize );
if (!ReadSourceImage( buf, header, outputData ))
return false;
outWidth = header.width;
outHeight = header.height;
return true;
}
//-----------------------------------------------------------------------------
// Reads a TGA, keeps it in RGBA8888
//-----------------------------------------------------------------------------
bool LoadRGBA8888( const char *pFileName, CUtlMemory<unsigned char> &outputData, int &outWidth, int &outHeight )
{
Assert( pFileName );
// memory for the file
CTempImage vec;
// Read that puppy in!
if (!ReadFile( pFileName, vec ))
return false;
// Make an unserialization buffer
CUtlBuffer buf( vec.Base(), vec.NumAllocated(), CUtlBuffer::READ_ONLY );
// Do the dirty deed
return LoadRGBA8888( buf, outputData, outWidth, outHeight );
}
} // end namespace TGALoader