From: SiPlus <hwguy.siplus@gmail.com>
Date: Thu, 2 Jul 2015 12:20:51 +0000 (+0300)
Subject: Add grayscale RLE TGA support
X-Git-Tag: xonotic-v0.8.2~21^2
X-Git-Url: http://de.git.xonotic.org/?p=xonotic%2Fnetradiant.git;a=commitdiff_plain;h=2318939a897761ce0c97cb87efd313c94110ec50

Add grayscale RLE TGA support
---

diff --git a/plugins/image/tga.cpp b/plugins/image/tga.cpp
index bc498a8f..4fa8731f 100644
--- a/plugins/image/tga.cpp
+++ b/plugins/image/tga.cpp
@@ -165,6 +165,42 @@ inline TargaPacketSize targa_packet_size( const TargaPacket& packet ){
 }
 
 
+class TargaDecodeGrayPixelRLE
+{
+TargaPacketSize m_packetSize;
+RGBAPixel m_pixel;
+TargaPacket m_packet;
+public:
+TargaDecodeGrayPixelRLE() : m_packetSize( 0 ){
+}
+void operator()( PointerInputStream& istream, RGBAPixel& pixel ){
+	if ( m_packetSize == 0 ) {
+		targa_packet_read_istream( m_packet, istream );
+		m_packetSize = targa_packet_size( m_packet );
+
+		if ( targa_packet_is_rle( m_packet ) ) {
+			istream_read_gray( istream, m_pixel );
+		}
+	}
+
+	if ( targa_packet_is_rle( m_packet ) ) {
+		pixel = m_pixel;
+	}
+	else
+	{
+		istream_read_gray( istream, pixel );
+	}
+
+	--m_packetSize;
+}
+};
+
+template<typename Flip>
+void targa_decode_rle_grayscale( PointerInputStream& istream, RGBAImage& image, const Flip& flip ){
+	TargaDecodeGrayPixelRLE decode;
+	image_decode( istream, decode, image, flip );
+}
+
 class TargaDecodeRGBPixelRLE
 {
 TargaPacketSize m_packetSize;
@@ -305,9 +341,12 @@ Image* Targa_decodeImageData( const TargaHeader& targa_header, PointerInputStrea
 			return 0;
 		}
 	}
-	else if ( targa_header.image_type == 10 ) {
+	else if ( targa_header.image_type == 10 || targa_header.image_type == 11 ) {
 		switch ( targa_header.pixel_size )
 		{
+		case 8:
+			targa_decode_rle_grayscale( istream, *image, flip );
+			break;
 		case 24:
 			targa_decode_rle_rgb( istream, *image, flip );
 			break;
@@ -333,9 +372,9 @@ Image* LoadTGABuff( const byte* buffer ){
 
 	targa_header_read_istream( targa_header, istream );
 
-	if ( targa_header.image_type != 2 && targa_header.image_type != 10 && targa_header.image_type != 3 ) {
+	if ( targa_header.image_type != 2 && targa_header.image_type != 10 && targa_header.image_type != 3 && targa_header.image_type != 11 ) {
 		globalErrorStream() << "LoadTGA: TGA type " << targa_header.image_type << " not supported\n";
-		globalErrorStream() << "LoadTGA: Only type 2 (RGB), 3 (gray), and 10 (RGB) TGA images supported\n";
+		globalErrorStream() << "LoadTGA: Only type 2 (RGB), 3 (gray), 10 (RGB), and 11 (gray) TGA images supported\n";
 		return 0;
 	}
 
@@ -344,9 +383,9 @@ Image* LoadTGABuff( const byte* buffer ){
 		return 0;
 	}
 
-	if ( ( targa_header.pixel_size != 32 && targa_header.pixel_size != 24 )
-		 && targa_header.image_type != 3 ) {
-		globalErrorStream() << "LoadTGA: Only 32 or 24 bit images supported\n";
+	if ( ( ( targa_header.image_type == 2 || targa_header.image_type == 10 ) && targa_header.pixel_size != 32 && targa_header.pixel_size != 24 ) ||
+	     ( ( targa_header.image_type == 3 || targa_header.image_type == 11 ) && targa_header.pixel_size != 8 ) ) {
+		globalErrorStream() << "LoadTGA: Only 32, 24 or 8 bit images supported\n";
 		return 0;
 	}