* BPrivateScreen used B_CURRENT_WORKSPACE where an index was required. This

was reason that caused bug #2658.
* Introduced a new constant B_CURRENT_WORKSPACE_INDEX in PrivateScreen.h; maybe
  this should be made public one day.
* Fixed another reason that caused bug #2658: BPrivateScreen waited 100ms
  between frame updates, leaving a large window open for such problems; I've
  reduced it to 10ms now, but the actual bug fix is to reset the counter for
  each BScreen object, so that when you create a new BScreen object, the frame
  is retrieved timely.
* The reference count was not initialized, causing BPrivateScreens to be leaked
  forever.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@32557 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kits/interface/PrivateScreen.cpp

@@ -31,6 +31,7 @@
 
 using namespace BPrivate;
 
+
 static BObjectList<BPrivateScreen> sScreens(2, true);
 
 // used to synchronize creation/deletion of the sScreen object
@@ -159,7 +160,7 @@ color_space
 BPrivateScreen::ColorSpace()
 {
 	display_mode mode;
-	if (GetMode(B_CURRENT_WORKSPACE, &mode) == B_OK)
+	if (GetMode(B_CURRENT_WORKSPACE_INDEX, &mode) == B_OK)
 		return (color_space)mode.space;
 
 	return B_NO_COLOR_SPACE;
@@ -171,10 +172,10 @@ BPrivateScreen::Frame()
 {
 	// If something goes wrong, we just return this rectangle.
 
-	if (system_time() > fLastUpdate + 100000) {
-		// invalidate the settings after 0.1 secs
+	if (system_time() > fLastUpdate + 10000) {
+		// invalidate the settings after 10 msecs
 		display_mode mode;
-		if (GetMode(B_CURRENT_WORKSPACE, &mode) == B_OK) {
+		if (GetMode(B_CURRENT_WORKSPACE_INDEX, &mode) == B_OK) {
 			fFrame.Set(0, 0, (float)mode.virtual_width - 1,
 				(float)mode.virtual_height - 1);
 			fLastUpdate = system_time();
@@ -649,6 +650,23 @@ BPrivateScreen::BytesPerRow()
 // #pragma mark - private methods
 
 
+void
+BPrivateScreen::_Acquire()
+{
+	fReferenceCount++;
+
+	fLastUpdate = 0;
+		// force an update for the new BScreen object
+}
+
+
+bool
+BPrivateScreen::_Release()
+{
+	return --fReferenceCount == 0;
+}
+
+
 sem_id
 BPrivateScreen::_RetraceSemaphore()
 {
@@ -687,6 +705,7 @@ BPrivateScreen::_GetFrameBufferConfig(frame_buffer_config& config)
 BPrivateScreen::BPrivateScreen(int32 id)
 	:
 	fID(id),
+	fReferenceCount(0),
 	fColorMap(NULL),
 	fRetraceSem(-1),
 	fRetraceSemValid(false),

src/kits/interface/PrivateScreen.h

@@ -22,6 +22,9 @@ class BApplication;
 class BWindow;
 
 
+#define B_CURRENT_WORKSPACE_INDEX	(~0L)
+
+
 namespace BPrivate {
 
 class BPrivateScreen {
@@ -88,8 +91,8 @@ private:
 								BPrivateScreen(int32 id);
 								~BPrivateScreen();
 
-			void				_Acquire() { fRefCount++; }
-			bool				_Release() { return --fRefCount == 0; }
+			void				_Acquire();
+			bool				_Release();
 
 			sem_id				_RetraceSemaphore();
 			status_t			_GetFrameBufferConfig(
@@ -100,7 +103,7 @@ private:
 
 private:
 			int32				fID;
-			int32				fRefCount;
+			int32				fReferenceCount;
 			color_map*			fColorMap;
 			sem_id				fRetraceSem;
 			bool				fRetraceSemValid;

src/kits/interface/Screen.cpp

@@ -7,6 +7,7 @@
  *		Axel Dörfler, axeld@pinc-software.de
  */
 
+
 /*!	BScreen lets you retrieve and change the display settings. */
 
 
@@ -15,11 +16,10 @@
 #include <Screen.h>
 #include <Window.h>
 
+
 using namespace BPrivate;
 
 
-static const uint32 kCurrentWorkspaceIndex = ~0;
-
 /*!	\brief Creates a BScreen object which represents the display with the given
 		screen_id
 	\param id The screen_id of the screen to get.
@@ -250,7 +250,7 @@ rgb_color
 BScreen::DesktopColor()
 {
 	if (fScreen != NULL)
-		return fScreen->DesktopColor(kCurrentWorkspaceIndex);
+		return fScreen->DesktopColor(B_CURRENT_WORKSPACE_INDEX);
 
 	return rgb_color();
 }
@@ -280,7 +280,7 @@ void
 BScreen::SetDesktopColor(rgb_color rgb, bool stick)
 {
 	if (fScreen != NULL)
-		fScreen->SetDesktopColor(rgb, kCurrentWorkspaceIndex, stick);
+		fScreen->SetDesktopColor(rgb, B_CURRENT_WORKSPACE_INDEX, stick);
 }
 
 
@@ -345,12 +345,13 @@ status_t
 BScreen::GetMode(display_mode* mode)
 {
 	if (fScreen != NULL)
-		return fScreen->GetMode(kCurrentWorkspaceIndex, mode);
+		return fScreen->GetMode(B_CURRENT_WORKSPACE_INDEX, mode);
 	return B_ERROR;
 }
 
 
 /*!	\brief Copies the current display_mode of the given workspace into mode.
+	\param workspace The index of the workspace to query.
 	\param mode A pointer to a display_mode structure,
 		where the current display_mode will be copied.
 	\return \c B_OK if the operation was succesful.
@@ -373,13 +374,13 @@ status_t
 BScreen::SetMode(display_mode* mode, bool makeDefault)
 {
 	if (fScreen != NULL)
-		return fScreen->SetMode(kCurrentWorkspaceIndex, mode, makeDefault);
+		return fScreen->SetMode(B_CURRENT_WORKSPACE_INDEX, mode, makeDefault);
 	return B_ERROR;
 }
 
 
 /*!	\brief Set the given workspace to the given mode.
-	\param workspace The workspace that you want to change.
+	\param workspace The index of the workspace that you want to change.
 	\param mode A pointer to a display_mode.
 	\param makeDefault If true, the mode becomes the default for the workspace.
 	\return \c B_OK.