From c5f61282a2391235e05ff40bc40a2f0852ea1a9f Mon Sep 17 00:00:00 2001
From: Andreas Monzner <andreas.monzner@multimedia-labs.de>
Date: Mon, 28 Nov 2005 00:38:00 +0000
Subject: [PATCH] add support for render pixmaps with transparent background
 use in skin for ePixmaps alphatest="on"

---
 lib/gdi/grc.h       |  7 ++++++-
 lib/gui/epixmap.cpp | 10 ++++++++--
 lib/gui/epixmap.h   |  2 ++
 skin.py             |  5 +++++
 4 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/lib/gdi/grc.h b/lib/gdi/grc.h
index 82243483..e277db34 100644
--- a/lib/gdi/grc.h
+++ b/lib/gdi/grc.h
@@ -220,7 +220,12 @@ public:
 	void fill(const gRegion &area);
 	
 	void clear();
-	
+
+	enum
+	{
+		BT_ALPHATEST = 1
+	};
+
 	void blit(gPixmap *pixmap, ePoint pos, const eRect &what=eRect(), int flags=0);
 
 	void setPalette(gRGB *colors, int start=0, int len=256);
diff --git a/lib/gui/epixmap.cpp b/lib/gui/epixmap.cpp
index e4e4acc3..3a377f14 100644
--- a/lib/gui/epixmap.cpp
+++ b/lib/gui/epixmap.cpp
@@ -2,10 +2,16 @@
 #include <lib/gdi/epng.h>
 #include <lib/gui/ewidgetdesktop.h>
 
-ePixmap::ePixmap(eWidget *parent): eWidget(parent)
+ePixmap::ePixmap(eWidget *parent)
+	:eWidget(parent), m_alphatest(false)
 {
 }
 
+void ePixmap::setAlphatest(bool alphatest)
+{
+	m_alphatest = alphatest;
+}
+
 void ePixmap::setPixmap(gPixmap *pixmap)
 {
 	m_pixmap = pixmap;
@@ -35,7 +41,7 @@ int ePixmap::event(int event, void *data, void *data2)
 		
 		gPainter &painter = *(gPainter*)data2;
 		if (m_pixmap)
-			painter.blit(m_pixmap, ePoint(0, 0));
+			painter.blit(m_pixmap, ePoint(0, 0), eRect(), m_alphatest?gPainter::BT_ALPHATEST:0);
 		
 		return 0;
 	}
diff --git a/lib/gui/epixmap.h b/lib/gui/epixmap.h
index 220db1ff..ce1e7a56 100644
--- a/lib/gui/epixmap.h
+++ b/lib/gui/epixmap.h
@@ -5,11 +5,13 @@
 
 class ePixmap: public eWidget
 {
+	bool m_alphatest;
 public:
 	ePixmap(eWidget *parent);
 	
 	void setPixmap(gPixmap *pixmap);
 	void setPixmapFromFile(const char *filename);
+	void setAlphatest(bool alphatest);
 protected:
 	ePtr<gPixmap> m_pixmap;
 	int event(int event, void *data=0, void *data2=0);
diff --git a/skin.py b/skin.py
index dc78c198..f5a67185 100644
--- a/skin.py
+++ b/skin.py
@@ -82,6 +82,11 @@ def applySingleAttribute(guiObject, desktop, attrib, value):
 			desktop.makeCompatiblePixmap(ptr)
 			guiObject.setPixmap(ptr)
 			# guiObject.setPixmapFromFile(value)
+		elif attrib == "alphatest": # used by ePixmap
+			guiObject.setAlphatest(
+				{ "on": True,
+				  "off": False
+				}[value])
 		elif attrib == "orientation": # used by eSlider
 			try:
 				guiObject.setOrientation(
-- 
2.30.2