GRAPHICS: Add setBackgroundPattern() to MacWindow

Set a background pattern for the window surface. For instance, the
exits window in the MacVenture engine should have a light gray
background, rather than a white one, and this will allow it to get
one without having to draw it by itself.

graphics/macgui/macwindow.cpp

@@ -44,6 +44,9 @@ MacWindow::MacWindow(int id, bool scrollable, bool resizable, bool editable, Mac
 	_active = false;
 	_borderIsDirty = true;
 
+	_pattern = 0;
+	_hasPattern = false;
+
 	_highlightedPart = kBorderNone;
 
 	_scrollPos = _scrollSize = 0.0;
@@ -83,6 +86,10 @@ void MacWindow::resize(int w, int h) {
 
 	_surface.free();
 	_surface.create(w, h, PixelFormat::createFormatCLUT8());
+
+	if (_hasPattern)
+		drawPattern();
+
 	_borderSurface.free();
 	_borderSurface.create(w, h, PixelFormat::createFormatCLUT8());
 	_composeSurface.free();
@@ -115,6 +122,13 @@ void MacWindow::setDimensions(const Common::Rect &r) {
 	_contentIsDirty = true;
 }
 
+void MacWindow::setBackgroundPattern(int pattern) {
+	_pattern = pattern;
+	_hasPattern = true;
+	drawPattern();
+	_contentIsDirty = true;
+}
+
 bool MacWindow::draw(ManagedSurface *g, bool forceRedraw) {
 	if (!_borderIsDirty && !_contentIsDirty && !forceRedraw)
 		return false;
@@ -273,6 +287,19 @@ void MacWindow::drawSimpleBorder(ManagedSurface *g) {
 	}
 }
 
+void MacWindow::drawPattern() {
+	byte *pat = _wm->getPatterns()[_pattern - 1];
+	for (int y = 0; y < _surface.h; y++) {
+		for (int x = 0; x < _surface.w; x++) {
+			byte *dst = (byte *)_surface.getBasePtr(x, y);
+			if (pat[y % 8] & (1 << (7 - (x % 8))))
+				*dst = kColorBlack;
+			else
+				*dst = kColorWhite;
+		}
+	}
+}
+
 void MacWindow::setHighlight(WindowClick highlightedPart) {
 	if (_highlightedPart == highlightedPart)
 		return;

graphics/macgui/macwindow.h

@@ -215,6 +215,12 @@ public:
 	 */
 	const Common::Rect &getInnerDimensions() { return _innerDims; }
 
+	/**
+	 * Set a background pattern for the window.
+	 * @param pattern
+	 */
+	void setBackgroundPattern(int pattern);
+
 	/**
 	 * Similar to that described in BaseMacWindow.
 	 * @param g See BaseMacWindow.
@@ -282,6 +288,7 @@ private:
 	void prepareBorderSurface(ManagedSurface *g);
 	void drawSimpleBorder(ManagedSurface *g);
 	void drawBorderFromSurface(ManagedSurface *g);
+	void drawPattern();
 	void drawBox(ManagedSurface *g, int x, int y, int w, int h);
 	void fillRect(ManagedSurface *g, int x, int y, int w, int h, int color);
 	const Font *getTitleFont();
@@ -298,6 +305,9 @@ private:
 
 	MacWindowBorder _macBorder;
 
+	int _pattern;
+	bool _hasPattern;
+
 	bool _scrollable;
 	bool _resizable;
 	bool _active;

graphics/macgui/macwindowmanager.cpp

@@ -48,7 +48,9 @@ static const byte palette[] = {
 static byte fillPatterns[][8] = { { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }, // kPatternSolid
 								  { 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55 }, // kPatternStripes
 								  { 0xaa, 0x55, 0xaa, 0x55, 0xaa, 0x55, 0xaa, 0x55 }, // kPatternCheckers
-								  { 0x55, 0xaa, 0x55, 0xaa, 0x55, 0xaa, 0x55, 0xaa }  // kPatternCheckers2
+								  { 0x55, 0xaa, 0x55, 0xaa, 0x55, 0xaa, 0x55, 0xaa }, // kPatternCheckers2
+								  { 0x88, 0x22, 0x88, 0x22, 0x88, 0x22, 0x88, 0x22 }, // kPatternLightGray
+								  { 0x77, 0xdd, 0x77, 0xdd, 0x77, 0xdd, 0x77, 0xdd }  // kPatternDarkGray
 };
 
 static const byte macCursorArrow[] = {

graphics/macgui/macwindowmanager.h

@@ -51,7 +51,9 @@ enum {
 	kPatternSolid = 1,
 	kPatternStripes = 2,
 	kPatternCheckers = 3,
-	kPatternCheckers2 = 4
+	kPatternCheckers2 = 4,
+	kPatternLightGray = 5,
+	kPatternDarkGray = 6
 };
 }
 using namespace MacGUIConstants;