GLK: FROTZ: Cleanup of image drawing code

engines/glk/frotz/glk_interface.cpp

@@ -489,25 +489,20 @@ void GlkInterface::showBeyondZorkTitle() {
 	int saveSlot = ConfMan.hasKey("save_slot") ? ConfMan.getInt("save_slot") : -1;
 
 	if (saveSlot == -1) {
-		uint winW, winH, imgW, imgH;
 		winid_t win = glk_window_open(0, 0, 0, wintype_Graphics, 0);
-		glk_window_get_size(win, &winW, &winH);
-
-		if (os_picture_data(1, &imgW, &imgH)) {
-			os_draw_picture(1, win, Common::Rect(0, 0, winW, winH));
-			_events->waitForPress();
-		}
+		glk_image_draw_scaled(win, 1, 0, 0, g_vm->_screen->w, g_vm->_screen->h);
 
+		_events->waitForPress();
 		glk_window_close(win, nullptr);
 	}
 }
 
-void GlkInterface::os_draw_picture(int picture, winid_t win, const Common::Point &pos) {
-	glk_image_draw(win, picture, pos.x - 1, pos.y - 1);
+void GlkInterface::os_draw_picture(int picture, const Common::Point &pos) {
+	glk_image_draw(_wp._background, picture, pos.x - 1, pos.y - 1);
 }
 
-void GlkInterface::os_draw_picture(int picture, winid_t win, const Common::Rect &r) {
-	glk_image_draw_scaled(win, picture, r.left, r.top, r.width(), r.height());
+void GlkInterface::os_draw_picture(int picture, const Common::Rect &r) {
+	glk_image_draw_scaled(_wp._background, picture, r.left, r.top, r.width(), r.height());
 }
 
 zchar GlkInterface::os_read_key(int timeout, bool show_cursor) {

engines/glk/frotz/glk_interface.h

@@ -171,12 +171,12 @@ class GlkInterface : public GlkAPI, public virtual UserOptions, public virtual M
 	/**
 	 * Display a picture at the given coordinates. Top left is (1,1).
 	 */
-	void os_draw_picture(int picture, winid_t win, const Common::Point &pos);
+	void os_draw_picture(int picture, const Common::Point &pos);
 
 	/**
 	 * Display a picture using the specified bounds
 	 */
-	void os_draw_picture(int picture, winid_t win, const Common::Rect &r);
+	void os_draw_picture(int picture, const Common::Rect &r);
 
 	/**
 	 * Call the IO interface to play a sample.

engines/glk/frotz/processor_windows.cpp

@@ -48,21 +48,19 @@ void Processor::z_draw_picture() {
 
 	flush_buffer();
 
+	Window &win = _wp[cwin];
 	if (!x || !y) {
-		// Currently I only support getting the cursor for the text grid area
-		assert(cwin == 1);
-		winid_t win = _wp._upper;
-		Point cursPos = win->getCursor();
+
 		// use cursor column if x-coordinate is 0
 		if (!x)
-			x = cursPos.x;
+			x = win[X_CURSOR];
 		// use cursor line if y-coordinate is 0
 		if (!y)
-			y = cursPos.y;
+			y = win[Y_CURSOR];
 	}
 
-//	y += cwp->y_pos - 1;
-//	x += cwp->x_pos - 1;
+	y += win[Y_POS] - 1;
+	x += win[X_POS] - 1;
 
 	/* The following is necessary to make Amiga and Macintosh story
 	 * files work with MCGA graphics files.  Some screen-filling
@@ -83,18 +81,18 @@ void Processor::z_draw_picture() {
 			if (_storyId == ARTHUR && pic == 54)
 			delta = h_screen_width / 160;
 
-			os_draw_picture(mapper[i].pic1, _wp._lower, Point(x + delta, y + height1));
-			os_draw_picture(mapper[i].pic2, _wp._lower, Point(x + width1 - width2 - delta, y + height1));
+			os_draw_picture(mapper[i].pic1, Point(x + delta, y + height1));
+			os_draw_picture(mapper[i].pic2, Point(x + width1 - width2 - delta, y + height1));
 		}
 	}
 
-	os_draw_picture(pic, _wp._lower, Point(x, y));
+	os_draw_picture(pic, Point(x, y));
 
 	if (_storyId == SHOGUN && pic == 3) {
 		uint height, width;
 
 		os_picture_data(59, &height, &width);
-		os_draw_picture(59, _wp._lower, Point(h_screen_width - width + 1, y));
+		os_draw_picture(59, Point(h_screen_width - width + 1, y));
 	}
 }
 

engines/glk/picture.cpp

@@ -32,8 +32,10 @@ namespace Glk {
 
 void Pictures::clear() {
 	for (uint idx = 0; idx < _store.size(); ++idx) {
-		_store[idx]._picture->decrement();
-		_store[idx]._scaled->decrement();
+		if (_store[idx]._picture)
+			_store[idx]._picture->decrement();
+		if (_store[idx]._scaled)
+			_store[idx]._scaled->decrement();
 	}
 
 	_store.clear();