Added experimental debug feature: variables influencing the rendering that can be set via console using the 'set' command. The implementation is still partial. Leveraging on this, the engine can now selectively display the current background mask instead of the background itself.

svn-id: r30808

1 files changed, 76 insertions, 3 deletions

diff --git a/engines/parallaction/graphics.cpp b/engines/parallaction/graphics.cpp
index e90cc54c9e..5654eddffb 100644
--- a/engines/parallaction/graphics.cpp
+++ b/engines/parallaction/graphics.cpp
@@ -32,6 +32,40 @@
 
 namespace Parallaction {
 
+
+typedef Common::HashMap<Common::String, int32, Common::IgnoreCase_Hash, Common::IgnoreCase_EqualTo> VarMap;
+VarMap _vars;
+
+void Gfx::registerVar(const Common::String &name, int32 initialValue) {
+	if (_vars.contains(name)) {
+		warning("Variable '%s' already registered, ignoring initial value.\n", name.c_str());
+	} else {
+		_vars.setVal(name, initialValue);
+	}
+}
+
+void Gfx::setVar(const Common::String &name, int32 value) {
+	if (!_vars.contains(name)) {
+		warning("Variable '%s' doesn't exist, skipping assignment.\n", name.c_str());
+	} else {
+		_vars.setVal(name, value);
+	}
+}
+
+int32 Gfx::getVar(const Common::String &name) {
+	int32 v = 0;
+
+	if (!_vars.contains(name)) {
+		warning("Variable '%s' doesn't exist, returning default value.\n", name.c_str());
+	} else {
+		v = _vars.getVal(name);
+	}
+
+	return v;
+}
+
+
+
 #define	LABEL_TRANSPARENT_COLOR 0xFF
 #define	BALLOON_TRANSPARENT_COLOR 2
 
@@ -348,14 +382,51 @@ void Gfx::clearScreen() {
 	g_system->clearScreen();
 }
 
+void Gfx::beginFrame() {
+
+	int32 oldBackgroundMode = _varBackgroundMode;
+	_varBackgroundMode = getVar("background_mode");
+
+	if (oldBackgroundMode != _varBackgroundMode) {
+		switch (_varBackgroundMode) {
+		case 1:
+			_bitmapMask.free();
+			break;
+		case 2:
+			_bitmapMask.create(_backgroundInfo.width, _backgroundInfo.height, 1);
+			byte *data = (byte*)_bitmapMask.pixels;
+			for (uint y = 0; y < _bitmapMask.h; y++) {
+				for (uint x = 0; x < _bitmapMask.w; x++) {
+					*data++ = _backgroundInfo.mask.getValue(x, y);
+				}
+			}
+			break;
+		}
+	}
+
+
+}
+
 void Gfx::updateScreen() {
 
 	// background may not cover the whole screen, so adjust bulk update size
 	uint w = MIN(_vm->_screenWidth, (int32)_backgroundInfo.width);
 	uint h = MIN(_vm->_screenHeight, (int32)_backgroundInfo.height);
 
-	// TODO: add displacement to source to handle scrolling in BRA
-	g_system->copyRectToScreen((const byte*)_backgroundInfo.bg.pixels, _backgroundInfo.bg.pitch, _backgroundInfo.x, _backgroundInfo.y, w, h);
+	byte *backgroundData;
+	uint16 backgroundPitch;
+	switch (_varBackgroundMode) {
+	case 1:
+		backgroundData = (byte*)_backgroundInfo.bg.pixels;
+		backgroundPitch = _backgroundInfo.bg.pitch;
+		break;
+	case 2:
+		backgroundData = (byte*)_bitmapMask.pixels;
+		backgroundPitch = _bitmapMask.pitch;
+		break;
+	}
+	g_system->copyRectToScreen(backgroundData, backgroundPitch, _backgroundInfo.x, _backgroundInfo.y, w, h);
+
 
 	// TODO: transform objects coordinates to be drawn with scrolling
 	Graphics::Surface *surf = g_system->lockScreen();
@@ -785,6 +856,9 @@ Gfx::Gfx(Parallaction* vm) :
 
 	_font = NULL;
 
+	registerVar("background_mode", 1);
+	_varBackgroundMode = 1;
+
 	return;
 }
 
@@ -1035,5 +1109,4 @@ void Gfx::setBackground(uint type, const char* name, const char* mask, const cha
 
 }
 
-
 } // namespace Parallaction