From 4f3f231afd98d63a2ebdbec94671549d0d68f46f Mon Sep 17 00:00:00 2001
From: Joseph-Eugene Winzer
Date: Sun, 18 Jun 2017 17:05:21 +0200
Subject: SUPERNOVA: Adds Container for temporarily storing screen sections

---
 engines/supernova/supernova.cpp | 37 +++++++++++++++++++++++++++++++++++++
 engines/supernova/supernova.h   | 29 +++++++++++++++++++++++++++++
 2 files changed, 66 insertions(+)

(limited to 'engines/supernova')

diff --git a/engines/supernova/supernova.cpp b/engines/supernova/supernova.cpp
index 6bd50f9572..bcc2347c30 100644
--- a/engines/supernova/supernova.cpp
+++ b/engines/supernova/supernova.cpp
@@ -431,4 +431,41 @@ Object *Inventory::get(size_t index) {
 	return NULL;
 }
 
+ScreenBufferStack::ScreenBufferStack()
+    : _last(_buffer) {
+}
+
+void ScreenBufferStack::push(int x, int y, int width, int height, int pitch) {
+	if (_last == ARRAYEND(_buffer))
+		return;
+
+	byte *pixels = new byte[width * height];
+	const byte *screen = static_cast<byte *>(g_system->lockScreen()->getBasePtr(x, y));
+	for (int i = 0; i < height; ++i) {
+		Common::copy(screen, screen + width, pixels);
+		screen += pitch * i;
+	}
+	g_system->unlockScreen();
+
+	_last->_x = x;
+	_last->_y = y;
+	_last->_width = width;
+	_last->_height = height;
+	_last->_pitch = pitch;
+	_last->_pixels = pixels;
+
+	++_last;
+}
+
+void ScreenBufferStack::restore() {
+	if (_last == _buffer)
+		return;
+
+	g_system->lockScreen()->copyRectToSurface(
+	            _last->_pixels, _last->_width, _last->_x, _last->_y,
+	            _last->_width, _last->_height);
+	g_system->unlockScreen();
+	--_last;
+}
+
 }
diff --git a/engines/supernova/supernova.h b/engines/supernova/supernova.h
index 2844c2aa6f..f97cd401e9 100644
--- a/engines/supernova/supernova.h
+++ b/engines/supernova/supernova.h
@@ -37,6 +37,35 @@
 
 namespace Supernova {
 
+struct ScreenBuffer {
+	ScreenBuffer()
+	    : _x(0)
+	    , _y(0)
+	    , _width(0)
+	    , _height(0)
+	    , _pitch(0)
+	    , _pixels(0)
+	{}
+
+	byte *_pixels;
+	int _x;
+	int _y;
+	int _width;
+	int _height;
+	int _pitch;
+};
+class ScreenBufferStack {
+public:
+	ScreenBufferStack();
+
+	void push(int x, int y, int width, int height, int pitch = 320);
+	void restore();
+
+private:
+	ScreenBuffer _buffer[8];
+	ScreenBuffer *_last;
+};
+
 class SupernovaEngine : public Engine {
 public:
 	SupernovaEngine(OSystem *syst);
-- 
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