Use true transparency when drawing menu shadows for apps that support ARGB visuals

git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdelibs@1247204 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

4 files changed, 233 insertions, 46 deletions

diff --git a/kdecore/kapplication.cpp b/kdecore/kapplication.cpp
index 3bdf0b4cc..91aa2a967 100644
--- a/kdecore/kapplication.cpp
+++ b/kdecore/kapplication.cpp
@@ -140,6 +140,8 @@
 #include <fixx11h.h>
 #endif
 
+#include <pwd.h>
+
 #ifndef Q_WS_WIN
 #include <KDE-ICE/ICElib.h>
 #else
@@ -1764,16 +1766,43 @@ public:
 
 #if defined(Q_WS_X11) && defined(COMPOSITE)
 bool KApplication::isCompositionManagerAvailable() {
-	KConfigGroup pConfig (KGlobal::config(), "General");
-	return pConfig.readBoolEntry("compositingManagerAvailable", false);
+	bool have_manager = false;
+	const char *home;
+	struct passwd *p;
+	p = getpwuid(getuid());
+	if (p)
+		home = p->pw_dir;
+	else
+		home = getenv("HOME");
+
+	char *filename;
+	const char *configfile = "/.kompmgr.available";
+	int n = strlen(home)+strlen(configfile)+1;
+	filename = (char*)malloc(n*sizeof(char));
+	memset(filename,0,n);
+	strcat(filename, home);
+	strcat(filename, configfile);
+
+        // Now that we did all that by way of introduction...read the file!
+	FILE *pFile;
+	char buffer[255];
+	pFile = fopen(filename, "r");
+	int kompmgrpid = 0;
+	if (pFile) {
+		have_manager = true;
+		fclose(pFile);
+	}
+
+	free(filename);
+	filename = NULL;
 
-return false;
+	return have_manager;
 }
 
-bool KApplication::detectCompositionManagerAvailable(bool force_available) {
+bool KApplication::detectCompositionManagerAvailable(bool force_available, bool available) {
 	bool compositing_manager_available;
 	if (force_available) {
-		compositing_manager_available = true;
+		compositing_manager_available = available;
 	}
 	else {
 		// See if compositing has been enabled
@@ -1781,7 +1810,7 @@ bool KApplication::detectCompositionManagerAvailable(bool force_available) {
 		char *displayname = 0;
 		if ( qtargs->isSet("display"))
 			displayname = qtargs->getOption( "display" ).data();
-			
+
 		Display *dpy = XOpenDisplay( displayname );
 	
 		x11_composite_error_generated = false;
@@ -1807,12 +1836,39 @@ bool KApplication::detectCompositionManagerAvailable(bool force_available) {
 		}
 	}
 	
-	KConfigGroup pConfig (KGlobal::config(), "General");
-	bool cmanager_enabled = pConfig.readBoolEntry("compositingManagerAvailable", false);
-	if (cmanager_enabled != compositing_manager_available) {
-		pConfig.writeEntry("compositingManagerAvailable", compositing_manager_available, true, true);
+	const char *home;
+	struct passwd *p;
+	p = getpwuid(getuid());
+	if (p)
+		home = p->pw_dir;
+	else
+		home = getenv("HOME");
+
+	char *filename;
+	const char *configfile = "/.kompmgr.available";
+	int n = strlen(home)+strlen(configfile)+1;
+	filename = (char*)malloc(n*sizeof(char));
+	memset(filename,0,n);
+	strcat(filename, home);
+	strcat(filename, configfile);
+
+	/* now that we did all that by way of introduction...create or remove the file! */
+	if (compositing_manager_available) {
+		FILE *pFile;
+		char buffer[255];
+		sprintf(buffer, "available");
+		pFile = fopen(filename, "w");
+		if (pFile) {
+			fwrite(buffer,1,strlen(buffer), pFile);
+			fclose(pFile);
+		}
 	}
-	pConfig.sync();
+	else {
+		unlink(filename);
+	}
+
+	free(filename);
+	filename = NULL;
 
 	return compositing_manager_available;
 }
@@ -1822,28 +1878,38 @@ Display* KApplication::openX11RGBADisplay() {
 	char *display = 0;
 	if ( qtargs->isSet("display"))
 		display = qtargs->getOption( "display" ).data();
-	
+
 	Display *dpy = XOpenDisplay( display );
 	if ( !dpy ) {
 		kdError() << "cannot connect to X server " << display << endl;
 		exit( 1 );
 	}
-	
+
 	return dpy;
 }
 
 Qt::HANDLE KApplication::getX11RGBAVisual(Display *dpy) {
 	getX11RGBAInformation(dpy);
-	return argb_x11_visual;
+	if (KApplication::isCompositionManagerAvailable() == true) {
+		return argb_x11_visual;
+	}
+	else {
+		return NULL;
+	}
 }
 
 Qt::HANDLE KApplication::getX11RGBAColormap(Display *dpy) {
 	getX11RGBAInformation(dpy);
-	return argb_x11_colormap;
+	if (KApplication::isCompositionManagerAvailable() == true) {
+		return argb_x11_colormap;
+	}
+	else {
+		return NULL;
+	}
 }
 
 bool KApplication::isX11CompositionAvailable() {
-	return argb_visual & isCompositionManagerAvailable();
+	return (argb_visual & isCompositionManagerAvailable());
 }
 
 void KApplication::getX11RGBAInformation(Display *dpy) {
@@ -1851,7 +1917,7 @@ void KApplication::getX11RGBAInformation(Display *dpy) {
 		argb_visual = false;
 		return;
 	}
-	
+
 	int screen = DefaultScreen( dpy );
 	Colormap colormap = 0;
 	Visual *visual = 0;
@@ -1896,6 +1962,28 @@ bool KApplication::isCompositionManagerAvailable() {
 }
 
 bool KApplication::detectCompositionManagerAvailable(bool force_available) {
+	const char *home;
+	struct passwd *p;
+	p = getpwuid(getuid());
+	if (p)
+		home = p->pw_dir;
+	else
+		home = getenv("HOME");
+
+	char *filename;
+	const char *configfile = "/.kompmgr.available";
+	int n = strlen(home)+strlen(configfile)+1;
+	filename = (char*)malloc(n*sizeof(char));
+	memset(filename,0,n);
+	strcat(filename, home);
+	strcat(filename, configfile);
+
+	/* now that we did all that by way of introduction...remove the file! */
+	unlink(filename);
+
+	free(filename);
+	filename = NULL;
+
 	return false;
 }
 
diff --git a/kdecore/kapplication.h b/kdecore/kapplication.h
index ee0d48f02..c16f105f2 100644
--- a/kdecore/kapplication.h
+++ b/kdecore/kapplication.h
@@ -914,9 +914,10 @@ public:
    * Note that calling this method will probably cause the screen to flicker.
    * @see isCompositionManagerAvailable()
    * @param force_available If set, force TDE to assume a composition manager is available
+   * @param available Whether or not the composition manager is available (only used if force_available is TRUE)
    * @return whether the composition manager is enabled
    */
-   bool detectCompositionManagerAvailable(bool force_available=false);
+   bool detectCompositionManagerAvailable(bool force_available=false, bool available=true);
 
   /**
    * @internal
diff --git a/kdecore/kdetcompmgr.cpp b/kdecore/kdetcompmgr.cpp
index 0b143d5de..c5cbd415f 100644
--- a/kdecore/kdetcompmgr.cpp
+++ b/kdecore/kdetcompmgr.cpp
@@ -49,16 +49,17 @@ int main(int argc, char **argv)
     KApplication app;
     app.detectCompositionManagerAvailable();
 
-    if (!app.isCompositionManagerAvailable()) {
+//    if (!app.isCompositionManagerAvailable()) {
 	KConfig config("kwinrc", true);
 	config.setGroup( "Notification Messages" );
 	if (config.readBoolEntry("UseTranslucency",false)) {
-		app.detectCompositionManagerAvailable(true);
+		app.detectCompositionManagerAvailable(true, true);
 		return 2;
 	}
 	else {
+		app.detectCompositionManagerAvailable(true, false);
 		return 0;
 	}
-    }
+//    }
 }
 
diff --git a/kdefx/kstyle.cpp b/kdefx/kstyle.cpp
index 473a61e43..3f3f36b71 100644
--- a/kdefx/kstyle.cpp
+++ b/kdefx/kstyle.cpp
@@ -63,6 +63,12 @@
 #undef HAVE_XRENDER
 #endif
 
+#ifdef HAVE_XCOMPOSITE
+#include <X11/extensions/Xrender.h>
+#include <X11/extensions/Xcomposite.h>
+#include <dlfcn.h>
+#endif
+
 #include <limits.h>
 
 namespace
@@ -138,6 +144,10 @@ class TransparencyHandler : public TQObject
 #ifdef HAVE_XRENDER
 		void XRenderBlendToPixmap(const TQWidget* p);
 #endif
+#ifdef HAVE_XCOMPOSITE
+	    bool haveX11RGBASupport();
+#endif
+		TQImage handleRealAlpha(TQImage);
 		void createShadowWindows(const TQWidget* p);
 		void removeShadowWindows(const TQWidget* p);
 		void rightShadow(TQImage& dst);
@@ -1951,9 +1961,24 @@ TransparencyHandler::~TransparencyHandler()
 {
 }
 
+bool TransparencyHandler::haveX11RGBASupport()
+{
+	// Simple way
+	if (TQPaintDevice::x11AppDepth() == 32) {
+		return true;
+	}
+	else {
+		return false;
+	}
+}
+
+#define REAL_ALPHA_STRENGTH 255.0
+
 // This is meant to be ugly but fast.
 void TransparencyHandler::rightShadow(TQImage& dst)
 {
+	bool have_composite = haveX11RGBASupport();
+
 	if (dst.depth() != 32)
 		dst = dst.convertDepth(32);
 
@@ -1965,34 +1990,60 @@ void TransparencyHandler::rightShadow(TQImage& dst)
 	register unsigned char* data = dst.bits();		// Skip alpha
 #endif
 	for(register int i = 0; i < 16; i++) {
-		*data = (unsigned char)((*data)*top_right_corner[i]); data++;
-		*data = (unsigned char)((*data)*top_right_corner[i]); data++;
-		*data = (unsigned char)((*data)*top_right_corner[i]); data++;
-		data++;	// skip alpha
+		if (have_composite) {
+			data++;
+			data++;
+			data++;
+			*data = (unsigned char)(REAL_ALPHA_STRENGTH*(1.0-top_right_corner[i])); data++;
+		}
+		else {
+			*data = (unsigned char)((*data)*top_right_corner[i]); data++;
+			*data = (unsigned char)((*data)*top_right_corner[i]); data++;
+			*data = (unsigned char)((*data)*top_right_corner[i]); data++;
+			data++;	// skip alpha
+		}
 	}
 
 	pixels -= 32;	// tint right strip without rounded edges.
 	register int c = 0;
 	for(register int i = 0; i < pixels; i++) {
-		*data = (unsigned char)((*data)*shadow_strip[c]); data++;
-		*data = (unsigned char)((*data)*shadow_strip[c]); data++;
-		*data = (unsigned char)((*data)*shadow_strip[c]); data++;
-		data++; // skip alpha
-	        ++c;
+		if (have_composite) {
+			data++;
+			data++;
+			data++;;
+			*data = (unsigned char)(REAL_ALPHA_STRENGTH*(1.0-shadow_strip[c])); data++;
+		}
+		else {
+			*data = (unsigned char)((*data)*shadow_strip[c]); data++;
+			*data = (unsigned char)((*data)*shadow_strip[c]); data++;
+			*data = (unsigned char)((*data)*shadow_strip[c]); data++;
+			data++; // skip alpha
+		}
+		++c;
 		c %= 4;
 	}
 
 	// tint bottom edge
 	for(register int i = 0; i < 16; i++) {
-		*data = (unsigned char)((*data)*bottom_right_corner[i]); data++;
-		*data = (unsigned char)((*data)*bottom_right_corner[i]); data++;
-		*data = (unsigned char)((*data)*bottom_right_corner[i]); data++;
-		data++;	// skip alpha
+		if (have_composite) {
+			data++;
+			data++;
+			data++;
+			*data = (unsigned char)(REAL_ALPHA_STRENGTH*(1.0-bottom_right_corner[i])); data++;
+		}
+		else {
+			*data = (unsigned char)((*data)*bottom_right_corner[i]); data++;
+			*data = (unsigned char)((*data)*bottom_right_corner[i]); data++;
+			*data = (unsigned char)((*data)*bottom_right_corner[i]); data++;
+			data++;	// skip alpha
+		}
 	}
 }
 
 void TransparencyHandler::bottomShadow(TQImage& dst)
 {
+	bool have_composite = haveX11RGBASupport();
+
 	if (dst.depth() != 32)
 		dst = dst.convertDepth(32);
 
@@ -2011,25 +2062,59 @@ void TransparencyHandler::bottomShadow(TQImage& dst)
 	{
 		// Bottom-left Corner
 		for(register int x = 0; x < 4; x++) {
-			*data = (unsigned char)((*data)*(*corner)); data++;
-			*data = (unsigned char)((*data)*(*corner)); data++;
-			*data = (unsigned char)((*data)*(*corner)); data++;
-			data++; // skip alpha
+			if (have_composite) {
+				data++;
+				data++;
+				data++;
+				*data = (unsigned char)(REAL_ALPHA_STRENGTH*(1.0-(*corner))); data++;
+			}
+			else {
+				*data = (unsigned char)((*data)*(*corner)); data++;
+				*data = (unsigned char)((*data)*(*corner)); data++;
+				*data = (unsigned char)((*data)*(*corner)); data++;
+				data++; // skip alpha
+			}
 			corner++;
 		}
 
 		// Scanline
 		for(register int x = 0; x < width; x++) {
-			*data = (unsigned char)((*data)*strip_data); data++;
-			*data = (unsigned char)((*data)*strip_data); data++;
-			*data = (unsigned char)((*data)*strip_data); data++;
-			data++;
+			if (have_composite) {
+				data++;
+				data++;
+				data++;
+				*data = (unsigned char)(REAL_ALPHA_STRENGTH*(1.0-strip_data)); data++;
+			}
+			else {
+				*data = (unsigned char)((*data)*strip_data); data++;
+				*data = (unsigned char)((*data)*strip_data); data++;
+				*data = (unsigned char)((*data)*strip_data); data++;
+				data++; // skip alpha
+			}
 		}
 
 		strip_data = shadow_strip[++line];
 	}
 }
 
+TQImage TransparencyHandler::handleRealAlpha(TQImage img) {
+	TQImage clearImage = img.convertDepth(32);
+	clearImage.setAlphaBuffer(true);
+
+	int w = clearImage.width();
+	int h = clearImage.height();
+
+	for (int y = 0; y < h; ++y) {
+		TQRgb *ls = (TQRgb *)clearImage.scanLine( y );
+		for (int x = 0; x < w; ++x) {
+			TQRgb l = ls[x];
+			ls[x] = tqRgba( 0, 0, 0, 0 );
+		}
+	}
+
+	return clearImage;
+}
+
 // Create a shadow of thickness 4.
 void TransparencyHandler::createShadowWindows(const TQWidget* p)
 {
@@ -2039,6 +2124,8 @@ void TransparencyHandler::createShadowWindows(const TQWidget* p)
 	TQRect shadow1(x2, p->y() + 4, 4, p->height());
 	TQRect shadow2(p->x() + 4, y2, p->width() - 4, 4);
 
+	bool have_composite = haveX11RGBASupport();
+
 	// Create a fake drop-down shadow effect via blended Xwindows
 	ShadowElements se;
 	se.w1 = new TQWidget(0, 0, (WFlags)(WStyle_Customize | WType_Popup | WX11BypassWM) );
@@ -2052,16 +2139,26 @@ void TransparencyHandler::createShadowWindows(const TQWidget* p)
 	shadowMap()[p] = se;
 
 	// Some hocus-pocus here to create the drop-shadow.
-	TQPixmap pix_shadow1 = TQPixmap::grabWindow(qt_xrootwin(),
-			shadow1.x(), shadow1.y(), shadow1.width(), shadow1.height());
-	TQPixmap pix_shadow2 = TQPixmap::grabWindow(qt_xrootwin(),
-			shadow2.x(), shadow2.y(), shadow2.width(), shadow2.height());
+	TQPixmap pix_shadow1;
+	TQPixmap pix_shadow2;
+	if (have_composite) {
+		pix_shadow1 = TQPixmap(shadow1.width(), shadow1.height());
+		pix_shadow2 = TQPixmap(shadow2.width(), shadow2.height());
+	}
+	else {
+		pix_shadow1 = TQPixmap::grabWindow(qt_xrootwin(),
+				shadow1.x(), shadow1.y(), shadow1.width(), shadow1.height());
+		pix_shadow2 = TQPixmap::grabWindow(qt_xrootwin(),
+				shadow2.x(), shadow2.y(), shadow2.width(), shadow2.height());
+	}
 
 	TQImage img;
 	img = pix_shadow1.convertToImage();
+	if (have_composite) img = handleRealAlpha(img);
 	rightShadow(img);
 	pix_shadow1.convertFromImage(img);
 	img = pix_shadow2.convertToImage();
+	if (have_composite) img = handleRealAlpha(img);
 	bottomShadow(img);
 	pix_shadow2.convertFromImage(img);