1 files changed, 169 insertions, 0 deletions
diff --git a/kimgio/xview.cpp b/kimgio/xview.cpp
new file mode 100644
index 000000000..d61a60fde
--- /dev/null
+++ b/kimgio/xview.cpp
@@ -0,0 +1,169 @@
+// Oliver Eiden <[email protected]>
+// 23.3.99
+// changed the mapping from 3-3-2 decoded pixels to 8-8-8 decoded true-color pixels
+// now it uses the same mapping as xv, this leads to better visual results
+// Patch merged in HEAD by Chris Spiegel <[email protected]>
+// This library is distributed under the conditions of the GNU LGPL.
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <qimage.h>
+
+#include <kdelibs_export.h>
+
+#include "xview.h"
+
+#define BUFSIZE 1024
+
+static const int b_255_3[]= {0,85,170,255},  // index*255/3
+           rg_255_7[]={0,36,72,109,145,182,218,255}; // index *255/7
+
+KDE_EXPORT void kimgio_xv_read( QImageIO *_imageio )
+{      
+	int x=-1;
+	int y=-1;
+	int maxval=-1;
+	QIODevice *iodev = _imageio->ioDevice();
+
+	char str[ BUFSIZE ];
+
+	// magic number must be "P7 332"
+	iodev->readLine( str, BUFSIZE );
+	if (strncmp(str,"P7 332",6)) return;
+
+	// next line #XVVERSION
+	iodev->readLine( str, BUFSIZE );
+	if (strncmp(str, "#XVVERSION", 10)) 
+		return;
+
+	// now it gets interesting, #BUILTIN means we are out.
+	// if IMGINFO comes, we are happy!
+	iodev->readLine( str, BUFSIZE );
+	if (strncmp(str, "#IMGINFO:", 9))
+		return;
+
+	// after this an #END_OF_COMMENTS signals everything to be ok!
+	iodev->readLine( str, BUFSIZE );
+	if (strncmp(str, "#END_OF", 7))
+		return;
+
+	// now a last line with width, height, maxval which is 
+	// supposed to be 255
+	iodev->readLine( str, BUFSIZE );
+	sscanf(str, "%d %d %d", &x, &y, &maxval);
+
+	if (maxval != 255) return;
+	int blocksize = x*y;
+        if(x < 0 || y < 0 || blocksize < x || blocksize < y)
+            return;
+
+	// now follows a binary block of x*y bytes. 
+	char *block = (char*) malloc(blocksize);
+        if(!block)
+            return;
+
+	if (iodev->readBlock(block, blocksize) != blocksize ) 
+	{
+		return;
+	}
+
+	// Create the image
+	QImage image( x, y, 8, maxval + 1, QImage::BigEndian );
+	if( image.isNull()) {
+                free(block);
+		return;
+        }
+
+	// how do the color handling? they are absolute 24bpp
+	// or at least can be calculated as such.
+	int r,g,b;
+
+	for ( int j = 0; j < 256; j++ )
+	{
+		r =  rg_255_7[((j >> 5) & 0x07)];
+		g =  rg_255_7[((j >> 2) & 0x07)];
+		b =  b_255_3[((j >> 0) & 0x03)];
+		image.setColor( j, qRgb( r, g, b ) );
+	}
+
+	for ( int py = 0; py < y; py++ )
+	{
+		uchar *data = image.scanLine( py );	
+		memcpy( data, block + py * x, x );
+	}
+
+	_imageio->setImage( image );
+	_imageio->setStatus( 0 );
+
+	free(block);
+	return;
+}
+
+KDE_EXPORT void kimgio_xv_write( QImageIO *imageio )
+{
+	QIODevice& f = *( imageio->ioDevice() );
+
+	// Removed "f.open(...)" and "f.close()" (tanghus)
+
+	const QImage& image = imageio->image();
+	int w = image.width(), h = image.height();
+
+	char str[ 1024 ];
+
+	// magic number must be "P7 332"
+	f.writeBlock( "P7 332\n", 7 );
+
+	// next line #XVVERSION
+	f.writeBlock( "#XVVERSION:\n", 12 );
+
+	// now it gets interesting, #BUILTIN means we are out.
+	// if IMGINFO comes, we are happy!
+	f.writeBlock( "#IMGINFO:\n", 10 );
+
+	// after this an #END_OF_COMMENTS signals everything to be ok!
+	f.writeBlock( "#END_OF_COMMENTS:\n", 18 );
+
+	// now a last line with width, height, maxval which is supposed to be 255
+	sprintf( str, "%i %i 255\n", w, h );
+	f.writeBlock( str, strlen( str ) );
+
+
+	if ( image.depth() == 1 )
+	{
+		image.convertDepth( 8 );
+	}
+
+	uchar* buffer = new uchar[ w ];
+
+	for ( int py = 0; py < h; py++ )
+	{
+		uchar *data = image.scanLine( py );
+		for ( int px = 0; px < w; px++ )
+		{
+			int r, g, b;
+			if ( image.depth() == 32 )
+			{
+				QRgb *data32 = (QRgb*) data;
+				r = qRed( *data32 ) >> 5;
+				g = qGreen( *data32 ) >> 5;		
+				b = qBlue( *data32 ) >> 6;
+				data += sizeof( QRgb );
+			}
+			else 
+			{
+				QRgb color = image.color( *data );
+				r = qRed( color ) >> 5;
+				g = qGreen( color ) >> 5;		
+				b = qBlue( color ) >> 6;
+				data++;
+			}
+			buffer[ px ] = ( r << 5 ) | ( g << 2 ) | b;
+		}
+		f.writeBlock( (const char*)buffer, w );
+	}
+        delete[] buffer;
+
+	imageio->setStatus( 0 );
+}
+