From ca4a13c757efb08fe4765485e360839d413fc3bb Mon Sep 17 00:00:00 2001
From: spillerrec <spillerrec@hotmail.com>
Date: Sat, 17 Oct 2015 21:12:17 +0200
Subject: [PATCH] FIX: Crash on duplicate images, but some of the methods in
 Image needs review. #3

---
 src/Image.cpp | 18 +++++++++++++-----
 src/Image.hpp |  4 ++--
 2 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/src/Image.cpp b/src/Image.cpp
index 0de2c18..beb7bfc 100644
--- a/src/Image.cpp
+++ b/src/Image.cpp
@@ -33,6 +33,18 @@ const auto PIXEL_DIFFERENT = 0; //Pixel do not match with other image
 const auto PIXEL_MATCH = 1;     //Pixel is the same as other image
 const auto PIXEL_SHARED = 2;    //Pixel is the same, but must not be set as it differ in another image
 
+static QImage make_mask( QSize size ){
+	QImage mask( size, QImage::Format_Indexed8 );
+	mask.setColor( PIXEL_MATCH, qRgb(255, 0, 0) );
+	mask.setColor( PIXEL_DIFFERENT, qRgb(0, 255, 0) );
+	mask.setColor( PIXEL_SHARED, qRgb(0, 0, 255) );
+	return mask;
+}
+
+Image::Image( QPoint pos, QImage img ) : pos(pos), img(img), mask(make_mask(img.size())) {
+	mask.fill( PIXEL_DIFFERENT );
+}
+
 /** Create a resized version of this image, will keep aspect ratio
  *  \param [in] size Maximum dimensions of the resized image
  *  \return The resized image */
@@ -170,11 +182,7 @@ Image Image::combine( Image on_top ) const{
 Image Image::difference( Image input ) const{
 	//TODO: images must be the same size and at same point
 	
-	QImage mask( img.size(), QImage::Format_Indexed8 );
-	mask.setColor( PIXEL_MATCH, qRgb(255, 0, 0) );
-	mask.setColor( PIXEL_DIFFERENT, qRgb(0, 255, 0) );
-	mask.setColor( PIXEL_SHARED, qRgb(0, 0, 255) );
-	
+	auto mask = make_mask( img.size() );
 	for( int iy=0; iy<img.height(); iy++ ){
 		auto out      = (const QRgb*)      img.constScanLine( iy );
 		auto in       = (const QRgb*)input.img.constScanLine( iy );
diff --git a/src/Image.hpp b/src/Image.hpp
index 9b12928..a096381 100644
--- a/src/Image.hpp
+++ b/src/Image.hpp
@@ -35,7 +35,7 @@ class Image {
 	public:
 		/** \param [in] pos Offset of the image
 		 *  \param [in] img The image data */
-		Image( QPoint pos, QImage img ) : pos(pos), img(img) { }
+		Image( QPoint pos, QImage img );
 		
 		/** \param [in] img QImage which will be converted to ARGB32 and positioned at {0,0} */
 		Image( QImage img ) : Image( {0,0}, img.convertToFormat(QImage::Format_ARGB32) ) { }
@@ -93,7 +93,7 @@ class Image {
 		Image sub_image( int x, int y, int width, int height ) const{
 			QSize newSize( std::min( x+width,  x+mask.width()  ) - x
 			             , std::min( y+height, y+mask.height() ) - y );
-			auto newMask = newSize.isNull() ? mask : mask.copy( x,y, newSize.width(), newSize.height() );
+			auto newMask = newSize.isNull() ? QImage() : mask.copy( x,y, newSize.width(), newSize.height() );
 			return Image( pos+QPoint(x,y), img, newMask );
 		}