added snapshot for tinygl driver

driver.h

@@ -81,7 +81,7 @@ public:
 
 	virtual void drawDepthBitmap(int x, int y, int w, int h, char *data) = 0;
 
-	virtual void getSnapshot(int x, int y, int w, int h, char **data, int flags) = 0;
+	virtual Bitmap *getScreenshot(int w, int h) = 0;
 	virtual void enableDim(int x, int y, int w, int h) = 0;
 	virtual void disableDim(int x, int y, int w, int h) = 0;
 

driver_gl.cpp

@@ -689,7 +689,8 @@ void DriverGL::destroyTextBitmap(TextObjectHandle *handle) {
 	delete[] (GLuint *)handle->texIds;
 }
 
-void DriverGL::getSnapshot(int x, int y, int w, int h, char **data, int flags) {
+Bitmap *DriverGL::getScreenshot(int w, int h) {
+	return NULL;
 }
 
 void DriverGL::drawDim() {

driver_gl.h

@@ -65,7 +65,7 @@ public:
 	void drawDepthBitmap(int x, int y, int w, int h, char *data);
 	void drawBitmap();
 
-	void getSnapshot(int x, int y, int w, int h, char **data, int flags);
+	Bitmap *getScreenshot(int w, int h);
 	void enableDim(int x, int y, int w, int h) { _dim = true; }
 	void disableDim(int x, int y, int w, int h) { _dim = false; }
 

driver_tinygl.cpp

@@ -473,7 +473,22 @@ void DriverTinyGL::destroyTextBitmap(TextObjectHandle *handle) {
 	SDL_FreeSurface((SDL_Surface *)handle->surface);
 }
 
-void DriverTinyGL::getSnapshot(int x, int y, int w, int h, char **data, int flags) {
+Bitmap *DriverTinyGL::getScreenshot(int w, int h) {
+	uint16 *buffer = new uint16[w * h];
+	assert(buffer);
+
+	float step_x = 640.0 / w;
+	float step_y = 480.0 / h;
+	int step = 0;
+	for (float y = 0; y < 479; y += step_y) {
+		for (float x = 0; x < 639; x += step_x) {
+			buffer[step++] = *((uint16 *)(_screen->pixels) + (int)y * 640 + (int)x); 
+		}
+	}
+
+	Bitmap *screenshot = new Bitmap((char *)buffer, w, h, "screenshot");
+	delete []buffer;
+	return screenshot;
 }
 
 void DriverTinyGL::drawDim() {

driver_tinygl.h

@@ -67,7 +67,7 @@ public:
 	void drawDepthBitmap(int x, int y, int w, int h, char *data);
 	void drawBitmap();
 
-	void getSnapshot(int x, int y, int w, int h, char **data, int flags);
+	Bitmap *getScreenshot(int w, int h);
 	void enableDim(int x, int y, int w, int h) { _dim = true; }
 	void disableDim(int x, int y, int w, int h) { _dim = false; }
 

lua.cpp

@@ -1312,6 +1312,8 @@ static void luaFileFindFirst() {
 	std::string dir_strWin32 = path;
 	g_searchFile = FindFirstFile(dir_strWin32.c_str(), &g_find_file_data);
 	g_firstFind = true;
+	if (g_searchFile == INVALID_HANDLE_VALUE)
+		g_searchFile = NULL;
 #else
 	g_searchFile = opendir(path);
 #endif
@@ -1532,7 +1534,7 @@ static void menuHandler() {
 	 * a lot of the operations necessary to use the menu
 	 */
 	bool menuChanged = false, sliderChanged = false;
-	switch(key) {
+	switch (key) {
 		case SDLK_ESCAPE:
 		{
 			lua_Object close = getTableFunction(menuTable, "cancel");
@@ -1881,6 +1883,15 @@ static void GetCurrentScript() {
 }
 
 static void ScreenShot() {
+	int width = check_int(1);
+	int height = check_int(2);
+			
+	Bitmap *screenshot = g_driver->getScreenshot(width, height);
+	if (screenshot) {
+		lua_pushusertag(screenshot, MKID('VBUF'));
+	} else {
+		lua_pushnil();
+	}
 }
 
 static void SubmitSaveGameData() {