From 6700a53676265787ab46106602234448e0174e55 Mon Sep 17 00:00:00 2001
From: Gareth Stockwell <gareth.stockwell@sosco.com>
Date: Wed, 16 Sep 2009 18:08:58 +0100
Subject: Added a utility function for reading color of individual pixels from
 the screen

---
 src/3rdparty/phonon/mmf/utils.cpp        | 75 ++++++++++++++++++++++++++++++++
 src/3rdparty/phonon/mmf/utils.h          |  9 ++++
 src/plugins/phonon/mmf/plugin/plugin.pro |  1 +
 3 files changed, 85 insertions(+)

diff --git a/src/3rdparty/phonon/mmf/utils.cpp b/src/3rdparty/phonon/mmf/utils.cpp
index cebc32e..3d674fd 100644
--- a/src/3rdparty/phonon/mmf/utils.cpp
+++ b/src/3rdparty/phonon/mmf/utils.cpp
@@ -50,5 +50,80 @@ MMF::MediaType MMF::Utils::mimeTypeToMediaType(const TDesC& mimeType)
 }
 
 
+#ifdef _DEBUG
+
+#include <hal.h>
+#include <hal_data.h>
+#include <gdi.h>
+#include <eikenv.h>
+
+struct TScreenInfo
+{
+	int width;
+	int height;
+	int bpp;
+	const char* address;
+	int initialOffset;
+	int lineOffset;
+	TDisplayMode displayMode;
+};
+
+void getScreenInfoL(TScreenInfo& info)
+{
+	info.displayMode = CEikonEnv::Static()->ScreenDevice()->DisplayMode();
+	
+	// Then we must set these as the input parameter
+	info.width = info.displayMode;
+	info.height = info.displayMode;
+	info.initialOffset = info.displayMode;
+	info.lineOffset = info.displayMode;
+	info.bpp = info.displayMode;
+
+	User::LeaveIfError( HAL::Get(HALData::EDisplayXPixels, info.width) );
+	User::LeaveIfError( HAL::Get(HALData::EDisplayYPixels, info.width) );
+		
+	int address;
+	User::LeaveIfError( HAL::Get(HALData::EDisplayMemoryAddress, address) );
+	info.address = reinterpret_cast<const char*>(address);
+	
+	User::LeaveIfError( HAL::Get(HALData::EDisplayOffsetToFirstPixel, info.initialOffset) );
+	
+	User::LeaveIfError( HAL::Get(HALData::EDisplayOffsetBetweenLines, info.lineOffset) );
+	
+	User::LeaveIfError( HAL::Get(HALData::EDisplayBitsPerPixel, info.bpp) );
+}
+
+
+QColor MMF::Utils::getScreenPixel(const QPoint& pos)
+{
+	TScreenInfo info;
+	TRAPD(err, getScreenInfoL(info));
+	QColor pixel;
+	if(err == KErrNone and pos.x() < info.width and pos.y() < info.height)
+	{
+		const int bytesPerPixel = info.bpp / 8;
+		Q_ASSERT(bytesPerPixel >= 3);
+		
+		const int stride = (info.width * bytesPerPixel) + info.lineOffset;
+	
+		const char* ptr =
+				info.address
+			+	info.initialOffset
+			+	pos.y() * stride
+			+	pos.x() * bytesPerPixel;
+		
+		// BGRA
+		pixel.setBlue(*ptr++);
+		pixel.setGreen(*ptr++);
+		pixel.setRed(*ptr++);
+		
+		if(bytesPerPixel == 4)
+			pixel.setAlpha(*ptr++);
+	}
+	return pixel;
+}
+
+#endif // _DEBUG
+
 QT_END_NAMESPACE
 
diff --git a/src/3rdparty/phonon/mmf/utils.h b/src/3rdparty/phonon/mmf/utils.h
index 5a26018..7db7831 100644
--- a/src/3rdparty/phonon/mmf/utils.h
+++ b/src/3rdparty/phonon/mmf/utils.h
@@ -22,6 +22,8 @@ along with this library.  If not, see <http://www.gnu.org/licenses/>.
 #include <private/qcore_symbian_p.h>
 #include <e32debug.h>   // for RDebug
 
+#include <QColor>
+
 #include "defs.h"
 
 QT_BEGIN_NAMESPACE
@@ -51,6 +53,13 @@ void panic(PanicCode code);
  * type.  If it is neither, the function returns MediaTypeUnknown.
  */
 MediaType mimeTypeToMediaType(const TDesC& mimeType);
+
+#ifdef _DEBUG
+/**
+ * Retrieve color of specified pixel from the screen.
+ */
+QColor getScreenPixel(const QPoint& pos);
+#endif
 }
 
 /**
diff --git a/src/plugins/phonon/mmf/plugin/plugin.pro b/src/plugins/phonon/mmf/plugin/plugin.pro
index c7bb327d..d620453 100644
--- a/src/plugins/phonon/mmf/plugin/plugin.pro
+++ b/src/plugins/phonon/mmf/plugin/plugin.pro
@@ -63,6 +63,7 @@ SOURCES +=                                           \
 debug {
     INCLUDEPATH += $$PHONON_MMF_DIR/mmfphonondebug
     LIBS += -lphonon_mmf_debug.lib
+    LIBS += -lhal
 }
 
 LIBS += -lmediaclientvideo  # For CVideoPlayerUtility
-- 
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