* Some preparations for DEC private mode settings support.

* Implemented alternate screen buffer support. Not used by any program
  yet, since we still use the beterm termcap entry.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26003 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/apps/terminal/BasicTerminalBuffer.cpp

@@ -120,6 +120,7 @@ BasicTerminalBuffer::Init(int32 width, int32 height, int32 historySize)
 	fScreenOffset = 0;
 
 	fOverwriteMode = true;
+	fAlternateScreenActive = false;
 
 	fScreen = _AllocateLines(width, height);
 	if (fScreen == NULL)
@@ -162,12 +163,10 @@ BasicTerminalBuffer::ResizeTo(int32 width, int32 height, int32 historyCapacity)
 	if (width == fWidth && height == fHeight)
 		return SetHistoryCapacity(historyCapacity);
 
-	// TODO: When alternate screen support is implemented, do that only when
+	if (fAlternateScreenActive)
-	// not using the alternate screen.
-	if (true)
-		return _ResizeRewrap(width, height, historyCapacity);
-
 		return _ResizeSimple(width, height, historyCapacity);
+
+	return _ResizeRewrap(width, height, historyCapacity);
 }
 
 
@@ -179,10 +178,12 @@ BasicTerminalBuffer::SetHistoryCapacity(int32 historyCapacity)
 
 
 void
-BasicTerminalBuffer::Clear()
+BasicTerminalBuffer::Clear(bool resetCursor)
 {
 	fScreenOffset = 0;
 	_ClearLines(0, fHeight - 1);
+
+	if (resetCursor)
 		fCursor.SetTo(0, 0);
 
 	if (fHistory != NULL)
@@ -585,6 +586,7 @@ BasicTerminalBuffer::InsertLF()
 	if (fCursor.y == fScrollBottom) {
 		_Scroll(fScrollTop, fScrollBottom, 1);
 	} else {
+		if (fCursor.y < fHeight - 1)
 			fCursor.y++;
 		_CursorChanged();
 	}
@@ -731,7 +733,7 @@ BasicTerminalBuffer::SetCursor(int32 x, int32 y)
 {
 //debug_printf("BasicTerminalBuffer::SetCursor(%d, %d)\n", x, y);
 	x = restrict_value(x, 0, fWidth - 1);
-	y = restrict_value(y, fScrollTop, fScrollBottom);
+	y = restrict_value(y, 0, fHeight - 1);
 	if (x != fCursor.x || y != fCursor.y) {
 		fCursor.x = x;
 		fCursor.y = y;
@@ -775,6 +777,18 @@ BasicTerminalBuffer::NotifyListener()
 // #pragma mark - private methods
 
 
+void
+BasicTerminalBuffer::_InvalidateAll()
+{
+	fDirtyInfo.invalidateAll = true;
+
+	if (!fDirtyInfo.messageSent) {
+		NotifyListener();
+		fDirtyInfo.messageSent = true;
+	}
+}
+
+
 /* static */ TerminalLine**
 BasicTerminalBuffer::_AllocateLines(int32 width, int32 count)
 {

src/apps/terminal/BasicTerminalBuffer.h

@@ -21,6 +21,7 @@ struct TerminalBufferDirtyInfo {
 	int32	linesScrolled;			// number of lines added to the history
 	int32	dirtyTop;				// dirty line range
 	int32	dirtyBottom;			//
+	bool	invalidateAll;
 	bool	messageSent;			// listener has been notified
 
 	bool IsDirtyRegionValid() const
@@ -41,6 +42,7 @@ struct TerminalBufferDirtyInfo {
 		linesScrolled = 0;
 		dirtyTop = INT_MAX;
 		dirtyBottom = INT_MIN;
+		invalidateAll = false;
 		messageSent = false;
 	}
 };
@@ -61,11 +63,11 @@ public:
 
 			TerminalBufferDirtyInfo& DirtyInfo()	{ return fDirtyInfo; }
 
-			status_t			ResizeTo(int32 width, int32 height);
+	virtual	status_t			ResizeTo(int32 width, int32 height);
-			status_t			ResizeTo(int32 width, int32 height,
+	virtual	status_t			ResizeTo(int32 width, int32 height,
 									int32 historyCapacity);
 			status_t			SetHistoryCapacity(int32 historyCapacity);
-			void				Clear();
+			void				Clear(bool resetCursor);
 
 			void				SynchronizeWith(
 									const BasicTerminalBuffer* other,
@@ -139,6 +141,7 @@ protected:
 
 	inline	void				_Invalidate(int32 top, int32 bottom);
 	inline	void				_CursorChanged();
+			void				_InvalidateAll();
 
 	static	TerminalLine**		_AllocateLines(int32 width, int32 count);
 	static	void				_FreeLines(TerminalLine** lines, int32 count);
@@ -182,6 +185,7 @@ protected:
 			TermPos				fSavedCursor;
 
 			bool				fOverwriteMode;	// false for insert
+			bool				fAlternateScreenActive;
 
 			int					fEncoding;
 

src/apps/terminal/TermParse.cpp

@@ -790,13 +790,15 @@ TermParse::EscParse()
 
 				case CASE_DECSET:
 					/* DECSET */
-					//      dpmodes(term, bitset);
+					for (int i = 0; i < nparam; i++)
+						_DecPrivateModeSet(param[i]);
 					parsestate = groundtable;
 					break;
 
 				case CASE_DECRST:
 					/* DECRST */
-					//      dpmodes(term, bitclr);
+					for (int i = 0; i < nparam; i++)
+						_DecPrivateModeReset(param[i]);
 					parsestate = groundtable;
 					break;
 
@@ -1070,3 +1072,80 @@ TermParse::_DeviceStatusReport(int n)
 			return;
 	}
 }
+
+
+void
+TermParse::_DecPrivateModeSet(int value)
+{
+	switch (value) {
+		case 1:
+			// Application Cursor Keys (whatever that means).
+			// Not supported yet.
+			break;
+		case 5:
+			// Reverse Video (inverses colors for the complete screen
+			// -- when followed by normal video, that's shortly flashes the
+			// screen).
+			// Not supported yet.
+			break;
+		case 12:
+			// Start Blinking Cursor.
+			// Not supported yet.
+			break;
+		case 25:
+			// Show Cursor
+			// Not supported yet.
+			break;
+		case 1034:
+			// Interpret "meta" key, sets eighth bit.
+			// Not supported yet.
+			break;
+		case 1049:
+			// Save cursor as in DECSC and use Alternate Screen Buffer, clearing
+			// it first.
+			fBuffer->SaveCursor();
+			fBuffer->UseAlternateScreenBuffer();
+			break;
+	}
+}
+
+
+void
+TermParse::_DecPrivateModeReset(int value)
+{
+	switch (value) {
+		case 1:
+			// Normal Cursor Keys (whatever that means).
+			// Not supported yet.
+			break;
+		case 3:
+			// 80 Column Mode.
+			// Not supported yet.
+			break;
+		case 4:
+			// Jump (Fast) Scroll.
+			// Not supported yet.
+			break;
+		case 5:
+			// Normal Video (Leaves Reverse Video, cf. there).
+			// Not supported yet.
+			break;
+		case 12:
+			// Stop Blinking Cursor.
+			// Not supported yet.
+			break;
+		case 25:
+			// Hide Cursor
+			// Not supported yet.
+			break;
+		case 1034:
+			// Don’t interpret "meta" key.
+			// Not supported yet.
+			break;
+		case 1049:
+			// Use Normal Screen Buffer and restore cursor as in DECRC.
+			fBuffer->RestoreCursor();
+			fBuffer->UseNormalScreenBuffer();
+			break;
+	}
+}

src/apps/terminal/TermParse.h

@@ -76,6 +76,8 @@ private:
 	status_t _ReadParserBuffer();
 
 	void _DeviceStatusReport(int n);
+	void _DecPrivateModeSet(int value);
+	void _DecPrivateModeReset(int value);
 
 	int fFd;
 

src/apps/terminal/TermView.cpp

@@ -710,9 +710,9 @@ TermView::Clear()
 
 	{
 		BAutolock _(fTextBuffer);
-		fTextBuffer->Clear();
+		fTextBuffer->Clear(true);
 	}
-	fVisibleTextBuffer->Clear();
+	fVisibleTextBuffer->Clear(true);
 
 //debug_printf("Invalidate()\n");
 	Invalidate();
@@ -1563,10 +1563,6 @@ TermView::_SynchronizeWithTextBuffer(int32 visibleDirtyTop,
 {
 	TerminalBufferDirtyInfo& info = fTextBuffer->DirtyInfo();
 	int32 linesScrolled = info.linesScrolled;
-	BRect bounds = Bounds();
-	int32 firstVisible = _LineAt(0);
-	int32 lastVisible = _LineAt(bounds.bottom);
-	int32 historySize = fTextBuffer->HistorySize();
 
 //debug_printf("TermView::_SynchronizeWithTextBuffer(): dirty: %ld - %ld, "
 //"scrolled: %ld, visible dirty: %ld - %ld\n", info.dirtyTop, info.dirtyBottom,
@@ -1630,6 +1626,22 @@ TermView::_SynchronizeWithTextBuffer(int32 visibleDirtyTop,
 		fScrolledSinceLastSync = 0;
 	}
 
+	// Simple case first -- complete invalidation.
+	if (info.invalidateAll) {
+		Invalidate();
+		_UpdateScrollBarRange();
+		int32 offset = _LineAt(0);
+		fVisibleTextBuffer->SynchronizeWith(fTextBuffer, offset, offset,
+			offset + fTextBuffer->Height() + 2);
+		info.Reset();
+		return;
+	}
+
+	BRect bounds = Bounds();
+	int32 firstVisible = _LineAt(0);
+	int32 lastVisible = _LineAt(bounds.bottom);
+	int32 historySize = fTextBuffer->HistorySize();
+
 	bool doScroll = false;
 	if (linesScrolled > 0) {
 		_UpdateScrollBarRange();

src/apps/terminal/TerminalBuffer.cpp

@@ -5,6 +5,8 @@
 
 #include "TerminalBuffer.h"
 
+#include <algorithm>
+
 #include <Message.h>
 
 #include "Coding.h"
@@ -18,6 +20,9 @@ TerminalBuffer::TerminalBuffer()
 	:
 	BLocker("terminal buffer"),
 	fEncoding(M_UTF8),
+	fAlternateScreen(NULL),
+	fAlternateHistory(NULL),
+	fAlternateScreenOffset(0),
 	fListenerValid(false)
 {
 }
@@ -25,6 +30,8 @@ TerminalBuffer::TerminalBuffer()
 
 TerminalBuffer::~TerminalBuffer()
 {
+	delete fAlternateScreen;
+	delete fAlternateHistory;
 }
 
 
@@ -34,6 +41,10 @@ TerminalBuffer::Init(int32 width, int32 height, int32 historySize)
 	if (Sem() < 0)
 		return Sem();
 
+	fAlternateScreen = _AllocateLines(width, height);
+	if (fAlternateScreen == NULL)
+		return B_NO_MEMORY;
+
 	return BasicTerminalBuffer::Init(width, height, historySize);
 }
 
@@ -95,3 +106,100 @@ TerminalBuffer::NotifyListener()
 	if (fListenerValid)
 		fListener.SendMessage(MSG_TERMINAL_BUFFER_CHANGED);
 }
+
+
+status_t
+TerminalBuffer::ResizeTo(int32 width, int32 height)
+{
+	int32 historyCapacity = 0;
+	if (!fAlternateScreenActive)
+		historyCapacity = HistoryCapacity();
+	else if (fAlternateHistory != NULL)
+		historyCapacity = fAlternateHistory->Capacity();
+
+	return ResizeTo(width, height, historyCapacity);
+}
+
+
+status_t
+TerminalBuffer::ResizeTo(int32 width, int32 height, int32 historyCapacity)
+{
+	// switch to the normal screen buffer first
+	bool alternateScreenActive = fAlternateScreenActive;
+	if (alternateScreenActive)
+		_SwitchScreenBuffer();
+
+	int32 oldWidth = fWidth;
+	int32 oldHeight = fHeight;
+
+	// Resize the normal screen buffer/history.
+	status_t error = BasicTerminalBuffer::ResizeTo(width, height,
+		historyCapacity);
+	if (error != B_OK) {
+		if (alternateScreenActive)
+			_SwitchScreenBuffer();
+		return error;
+	}
+
+	TermPos cursor = fCursor;
+
+	// Switch to the alternate screen buffer and resize it.
+	if (fAlternateScreen != NULL) {
+		_SwitchScreenBuffer();
+
+		fWidth = oldWidth;
+		fHeight = oldHeight;
+		fCursor.SetTo(0, 0);
+
+		error = BasicTerminalBuffer::ResizeTo(width, height, 0);
+		if (error != B_OK) {
+			// This sucks -- we can't do anything about it. Delete the
+			// alternate screen buffer.
+			_FreeLines(fAlternateScreen, oldHeight);
+			fAlternateScreen = NULL;
+		}
+
+		// Switch back.
+		if (!alternateScreenActive)
+			_SwitchScreenBuffer();
+
+		fWidth = width;
+		fHeight = height;
+		fCursor = cursor;
+	}
+
+	return error;
+}
+
+
+void
+TerminalBuffer::UseAlternateScreenBuffer()
+{
+	if (fAlternateScreenActive || fAlternateScreen == NULL)
+		return;
+
+	_SwitchScreenBuffer();
+	Clear(false);
+	_InvalidateAll();
+}
+
+
+void
+TerminalBuffer::UseNormalScreenBuffer()
+{
+	if (!fAlternateScreenActive)
+		return;
+
+	_SwitchScreenBuffer();
+	_InvalidateAll();
+}
+
+
+void
+TerminalBuffer::_SwitchScreenBuffer()
+{
+	std::swap(fScreen, fAlternateScreen);
+	std::swap(fHistory, fAlternateHistory);
+	std::swap(fScreenOffset, fAlternateScreenOffset);
+	fAlternateScreenActive = !fAlternateScreenActive;
+}

src/apps/terminal/TerminalBuffer.h

@@ -28,12 +28,26 @@ public:
 			void				SetTitle(const char* title);
 			void				NotifyQuit(int32 reason);
 
+	virtual	status_t			ResizeTo(int32 width, int32 height);
+	virtual	status_t			ResizeTo(int32 width, int32 height,
+									int32 historyCapacity);
+
+			void				UseAlternateScreenBuffer();
+			void				UseNormalScreenBuffer();
+
 protected:
 	virtual	void				NotifyListener();
 
+private:
+			void				_SwitchScreenBuffer();
+
 private:
 			int					fEncoding;
 
+			TerminalLine**		fAlternateScreen;
+			HistoryBuffer*		fAlternateHistory;
+			int32				fAlternateScreenOffset;
+
 			// listener/dirty region management
 			BMessenger			fListener;
 			bool				fListenerValid;