378 lines
10 KiB
C++
378 lines
10 KiB
C++
/*
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Copyright (C) 2001-2006, William Joseph.
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All Rights Reserved.
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This file is part of GtkRadiant.
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GtkRadiant is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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GtkRadiant is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GtkRadiant; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "tga.h"
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#include "ifilesystem.h"
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#include "iarchive.h"
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#include "idatastream.h"
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typedef unsigned char byte;
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#include <stdlib.h>
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#include "generic/bitfield.h"
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#include "imagelib.h"
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#include "bytestreamutils.h"
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// represents x,y origin of tga image being decoded
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class Flip00 {}; // no flip
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class Flip01 {}; // vertical flip only
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class Flip10 {}; // horizontal flip only
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class Flip11 {}; // both
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template<typename PixelDecoder>
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void image_decode( PointerInputStream& istream, PixelDecoder& decode, RGBAImage& image, const Flip00& ){
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RGBAPixel* end = image.pixels + ( image.height * image.width );
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for ( RGBAPixel* row = end; row != image.pixels; row -= image.width )
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{
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for ( RGBAPixel* pixel = row - image.width; pixel != row; ++pixel )
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{
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decode( istream, *pixel );
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}
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}
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}
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template<typename PixelDecoder>
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void image_decode( PointerInputStream& istream, PixelDecoder& decode, RGBAImage& image, const Flip01& ){
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RGBAPixel* end = image.pixels + ( image.height * image.width );
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for ( RGBAPixel* row = image.pixels; row != end; row += image.width )
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{
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for ( RGBAPixel* pixel = row; pixel != row + image.width; ++pixel )
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{
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decode( istream, *pixel );
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}
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}
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}
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template<typename PixelDecoder>
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void image_decode( PointerInputStream& istream, PixelDecoder& decode, RGBAImage& image, const Flip10& ){
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RGBAPixel* end = image.pixels + ( image.height * image.width );
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for ( RGBAPixel* row = end; row != image.pixels; row -= image.width )
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{
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for ( RGBAPixel* pixel = row; pixel != row - image.width; )
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{
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decode( istream, *--pixel );
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}
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}
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}
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template<typename PixelDecoder>
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void image_decode( PointerInputStream& istream, PixelDecoder& decode, RGBAImage& image, const Flip11& ){
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RGBAPixel* end = image.pixels + ( image.height * image.width );
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for ( RGBAPixel* row = image.pixels; row != end; row += image.width )
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{
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for ( RGBAPixel* pixel = row + image.width; pixel != row; )
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{
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decode( istream, *--pixel );
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}
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}
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}
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inline void istream_read_gray( PointerInputStream& istream, RGBAPixel& pixel ){
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istream.read( &pixel.blue, 1 );
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pixel.red = pixel.green = pixel.blue;
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pixel.alpha = 0xff;
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}
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inline void istream_read_rgb( PointerInputStream& istream, RGBAPixel& pixel ){
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istream.read( &pixel.blue, 1 );
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istream.read( &pixel.green, 1 );
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istream.read( &pixel.red, 1 );
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pixel.alpha = 0xff;
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}
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inline void istream_read_rgba( PointerInputStream& istream, RGBAPixel& pixel ){
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istream.read( &pixel.blue, 1 );
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istream.read( &pixel.green, 1 );
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istream.read( &pixel.red, 1 );
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istream.read( &pixel.alpha, 1 );
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}
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class TargaDecodeGrayPixel
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{
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public:
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void operator()( PointerInputStream& istream, RGBAPixel& pixel ){
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istream_read_gray( istream, pixel );
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}
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};
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template<typename Flip>
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void targa_decode_grayscale( PointerInputStream& istream, RGBAImage& image, const Flip& flip ){
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TargaDecodeGrayPixel decode;
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image_decode( istream, decode, image, flip );
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}
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class TargaDecodeRGBPixel
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{
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public:
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void operator()( PointerInputStream& istream, RGBAPixel& pixel ){
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istream_read_rgb( istream, pixel );
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}
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};
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template<typename Flip>
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void targa_decode_rgb( PointerInputStream& istream, RGBAImage& image, const Flip& flip ){
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TargaDecodeRGBPixel decode;
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image_decode( istream, decode, image, flip );
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}
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class TargaDecodeRGBAPixel
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{
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public:
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void operator()( PointerInputStream& istream, RGBAPixel& pixel ){
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istream_read_rgba( istream, pixel );
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}
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};
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template<typename Flip>
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void targa_decode_rgba( PointerInputStream& istream, RGBAImage& image, const Flip& flip ){
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TargaDecodeRGBAPixel decode;
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image_decode( istream, decode, image, flip );
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}
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typedef byte TargaPacket;
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typedef byte TargaPacketSize;
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inline void targa_packet_read_istream( TargaPacket& packet, PointerInputStream& istream ){
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istream.read( &packet, 1 );
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}
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inline bool targa_packet_is_rle( const TargaPacket& packet ){
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return ( packet & 0x80 ) != 0;
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}
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inline TargaPacketSize targa_packet_size( const TargaPacket& packet ){
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return 1 + ( packet & 0x7f );
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}
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class TargaDecodeRGBPixelRLE
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{
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TargaPacketSize m_packetSize;
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RGBAPixel m_pixel;
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TargaPacket m_packet;
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public:
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TargaDecodeRGBPixelRLE() : m_packetSize( 0 ){
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}
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void operator()( PointerInputStream& istream, RGBAPixel& pixel ){
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if ( m_packetSize == 0 ) {
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targa_packet_read_istream( m_packet, istream );
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m_packetSize = targa_packet_size( m_packet );
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if ( targa_packet_is_rle( m_packet ) ) {
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istream_read_rgb( istream, m_pixel );
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}
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}
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if ( targa_packet_is_rle( m_packet ) ) {
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pixel = m_pixel;
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}
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else
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{
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istream_read_rgb( istream, pixel );
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}
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--m_packetSize;
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}
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};
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template<typename Flip>
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void targa_decode_rle_rgb( PointerInputStream& istream, RGBAImage& image, const Flip& flip ){
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TargaDecodeRGBPixelRLE decode;
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image_decode( istream, decode, image, flip );
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}
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class TargaDecodeRGBAPixelRLE
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{
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TargaPacketSize m_packetSize;
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RGBAPixel m_pixel;
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TargaPacket m_packet;
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public:
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TargaDecodeRGBAPixelRLE() : m_packetSize( 0 ){
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}
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void operator()( PointerInputStream& istream, RGBAPixel& pixel ){
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if ( m_packetSize == 0 ) {
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targa_packet_read_istream( m_packet, istream );
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m_packetSize = targa_packet_size( m_packet );
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if ( targa_packet_is_rle( m_packet ) ) {
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istream_read_rgba( istream, m_pixel );
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}
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}
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if ( targa_packet_is_rle( m_packet ) ) {
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pixel = m_pixel;
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}
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else
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{
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istream_read_rgba( istream, pixel );
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}
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--m_packetSize;
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}
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};
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template<typename Flip>
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void targa_decode_rle_rgba( PointerInputStream& istream, RGBAImage& image, const Flip& flip ){
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TargaDecodeRGBAPixelRLE decode;
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image_decode( istream, decode, image, flip );
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}
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struct TargaHeader
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{
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unsigned char id_length, colormap_type, image_type;
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unsigned short colormap_index, colormap_length;
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unsigned char colormap_size;
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unsigned short x_origin, y_origin, width, height;
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unsigned char pixel_size, attributes;
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};
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inline void targa_header_read_istream( TargaHeader& targa_header, PointerInputStream& istream ){
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targa_header.id_length = istream_read_byte( istream );
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targa_header.colormap_type = istream_read_byte( istream );
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targa_header.image_type = istream_read_byte( istream );
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targa_header.colormap_index = istream_read_int16_le( istream );
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targa_header.colormap_length = istream_read_int16_le( istream );
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targa_header.colormap_size = istream_read_byte( istream );
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targa_header.x_origin = istream_read_int16_le( istream );
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targa_header.y_origin = istream_read_int16_le( istream );
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targa_header.width = istream_read_int16_le( istream );
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targa_header.height = istream_read_int16_le( istream );
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targa_header.pixel_size = istream_read_byte( istream );
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targa_header.attributes = istream_read_byte( istream );
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if ( targa_header.id_length != 0 ) {
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istream.seek( targa_header.id_length ); // skip TARGA image comment
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}
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}
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template<typename Type>
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class ScopeDelete
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{
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Type* m_value;
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ScopeDelete( const ScopeDelete& );
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ScopeDelete& operator=( const ScopeDelete& );
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public:
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ScopeDelete( Type* value ) : m_value( value ){
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}
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~ScopeDelete(){
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delete m_value;
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}
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Type* get_pointer() const {
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return m_value;
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}
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};
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template<typename Flip>
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Image* Targa_decodeImageData( const TargaHeader& targa_header, PointerInputStream& istream, const Flip& flip ){
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RGBAImage* image = new RGBAImage( targa_header.width, targa_header.height );
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if ( targa_header.image_type == 2 || targa_header.image_type == 3 ) {
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switch ( targa_header.pixel_size )
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{
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case 8:
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targa_decode_grayscale( istream, *image, flip );
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break;
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case 24:
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targa_decode_rgb( istream, *image, flip );
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break;
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case 32:
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targa_decode_rgba( istream, *image, flip );
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break;
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default:
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globalErrorStream() << "LoadTGA: illegal pixel_size '" << targa_header.pixel_size << "'\n";
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image->release();
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return 0;
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}
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}
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else if ( targa_header.image_type == 10 ) {
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switch ( targa_header.pixel_size )
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{
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case 24:
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targa_decode_rle_rgb( istream, *image, flip );
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break;
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case 32:
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targa_decode_rle_rgba( istream, *image, flip );
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break;
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default:
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globalErrorStream() << "LoadTGA: illegal pixel_size '" << targa_header.pixel_size << "'\n";
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image->release();
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return 0;
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}
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}
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return image;
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}
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const unsigned int TGA_FLIP_HORIZONTAL = 0x10;
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const unsigned int TGA_FLIP_VERTICAL = 0x20;
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Image* LoadTGABuff( const byte* buffer ){
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PointerInputStream istream( buffer );
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TargaHeader targa_header;
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targa_header_read_istream( targa_header, istream );
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if ( targa_header.image_type != 2 && targa_header.image_type != 10 && targa_header.image_type != 3 ) {
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globalErrorStream() << "LoadTGA: TGA type " << targa_header.image_type << " not supported\n";
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globalErrorStream() << "LoadTGA: Only type 2 (RGB), 3 (gray), and 10 (RGB) TGA images supported\n";
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return 0;
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}
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if ( targa_header.colormap_type != 0 ) {
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globalErrorStream() << "LoadTGA: colormaps not supported\n";
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return 0;
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}
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if ( ( targa_header.pixel_size != 32 && targa_header.pixel_size != 24 )
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&& targa_header.image_type != 3 ) {
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globalErrorStream() << "LoadTGA: Only 32 or 24 bit images supported\n";
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return 0;
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}
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if ( !bitfield_enabled( targa_header.attributes, TGA_FLIP_HORIZONTAL )
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&& !bitfield_enabled( targa_header.attributes, TGA_FLIP_VERTICAL ) ) {
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return Targa_decodeImageData( targa_header, istream, Flip00() );
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}
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if ( !bitfield_enabled( targa_header.attributes, TGA_FLIP_HORIZONTAL )
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&& bitfield_enabled( targa_header.attributes, TGA_FLIP_VERTICAL ) ) {
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return Targa_decodeImageData( targa_header, istream, Flip01() );
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}
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if ( bitfield_enabled( targa_header.attributes, TGA_FLIP_HORIZONTAL )
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&& !bitfield_enabled( targa_header.attributes, TGA_FLIP_VERTICAL ) ) {
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return Targa_decodeImageData( targa_header, istream, Flip10() );
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}
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if ( bitfield_enabled( targa_header.attributes, TGA_FLIP_HORIZONTAL )
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&& bitfield_enabled( targa_header.attributes, TGA_FLIP_VERTICAL ) ) {
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return Targa_decodeImageData( targa_header, istream, Flip11() );
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}
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// unreachable
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return 0;
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}
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Image* LoadTGA( ArchiveFile& file ){
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ScopedArchiveBuffer buffer( file );
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return LoadTGABuff( buffer.buffer );
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}
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