/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "common/system.h"

#include "graphics/macega.h"
#include "graphics/fonts/macfont.h"
#include "graphics/macgui/macfontmanager.h"

#include "scumm/actor.h"
#include "scumm/charset.h"
#include "scumm/gfx_mac.h"
#include "scumm/usage_bits.h"
#include "scumm/verbs.h"

namespace Scumm {

void ScummEngine::mac_markScreenAsDirty(int x, int y, int w, int h) {
	// Mark the virtual screen as dirty. The top and left coordinates are
	// rounded down, while the bottom and right ones are rounded up.

	VirtScreen *vs = &_virtscr[kMainVirtScreen];

	int vsTop = y / 2 - vs->topline;
	int vsBottom = (y + h) / 2 - vs->topline;
	int vsLeft = x / 2;
	int vsRight = (x + w) / 2;

	if ((y + h) & 1)
		vsBottom++;

	if ((x + w) & 1)
		vsRight++;

	markRectAsDirty(kMainVirtScreen, vsLeft, vsRight, vsTop, vsBottom);
}

void ScummEngine::mac_drawStripToScreen(VirtScreen *vs, int top, int x, int y, int width, int height) {
	// The verb screen is completely replaced with a custom GUI. While
	// it is active, all other drawing to that area is suspended.
	if (_macIndy3Gui && vs->number == kVerbVirtScreen && _macIndy3Gui->isVerbGuiActive())
		return;

	const byte *pixels = vs->getPixels(x, top);
	const byte *ts = (byte *)_textSurface.getBasePtr(x * 2, y * 2);
	byte *mac = (byte *)_macScreen->getBasePtr(x * 2, y * 2);

	int pixelsPitch = vs->pitch;
	int tsPitch = _textSurface.pitch;
	int macPitch = _macScreen->pitch;

	// In b/w Mac rendering mode, the shadow palette is implemented here,
	// and not as a palette manipulation. See special cases in o5_roomOps()
	// and updatePalette().
	//
	// This is used at the very least for the lightning flashes at Castle
	// Brunwald in Indy 3, as well as the scene where the dragon finds
	// Rusty in Loom.
	//
	// Interestingly, the original Mac interpreter does not seem to do
	// this, and instead just renders the scene as if the palette was
	// unmodified. At least, that's what Mini vMac did when I tried it.

	if (_renderMode == Common::kRenderMacintoshBW) {
		for (int h = 0; h < height; h++) {
			for (int w = 0; w < width; w++) {
				int color = _enableEnhancements ? _shadowPalette[pixels[w]] : pixels[w];
				if (ts[2 * w] == CHARSET_MASK_TRANSPARENCY)
					mac[2 * w] = Graphics::macEGADither[color][0];
				if (ts[2 * w + 1] == CHARSET_MASK_TRANSPARENCY)
					mac[2 * w + 1] = Graphics::macEGADither[color][1];
				if (ts[2 * w + tsPitch] == CHARSET_MASK_TRANSPARENCY)
					mac[2 * w + macPitch] = Graphics::macEGADither[color][2];
				if (ts[2 * w + tsPitch + 1] == CHARSET_MASK_TRANSPARENCY)
					mac[2 * w + macPitch + 1] = Graphics::macEGADither[color][3];
			}

			pixels += pixelsPitch;
			ts += tsPitch * 2;
			mac += macPitch * 2;
		}
	} else {
		for (int h = 0; h < height; h++) {
			for (int w = 0; w < width; w++) {
				if (ts[2 * w] == CHARSET_MASK_TRANSPARENCY)
					mac[2 * w] = pixels[w];
				if (ts[2 * w + 1] == CHARSET_MASK_TRANSPARENCY)
					mac[2 * w + 1] = pixels[w];
				if (ts[2 * w + tsPitch] == CHARSET_MASK_TRANSPARENCY)
					mac[2 * w + macPitch] = pixels[w];
				if (ts[2 * w + tsPitch + 1] == CHARSET_MASK_TRANSPARENCY)
					mac[2 * w + macPitch + 1] = pixels[w];
			}

			pixels += pixelsPitch;
			ts += tsPitch * 2;
			mac += macPitch * 2;
		}
	}

	_system->copyRectToScreen(_macScreen->getBasePtr(x * 2, y * 2), _macScreen->pitch, x * 2, y * 2, width * 2, height * 2);
}

void ScummEngine::mac_drawLoomPracticeMode() {
	// In practice mode, the game shows the notes as they are being played.
	// In the DOS version, this is drawn by script 27 but the Mac version
	// just sets variables 50 and 54. The box is actually a verb, and it
	// seems that setting variable 50 is pretty much equal to turning verb
	// 53 on or off. I'm not sure what the purpose of variable 54 is.

	int x = 216;
	int y = 377;
	int width = 62;
	int height = 22;
	int var = 50;

	byte *ptr = (byte *)_macScreen->getBasePtr(x,  y);
	int pitch = _macScreen->pitch;

	int slot = getVerbSlot(53, 0);
	VerbSlot *vs = &_verbs[slot];

	vs->curmode = (VAR(var) != 0);
	vs->curRect.left = x / 2;
	vs->curRect.right = (x + width) / 2;
	vs->curRect.top = y / 22;
	vs->curRect.bottom = (y + height) / 2;

	_macScreen->fillRect(Common::Rect(x, y, x + width, y + height), 0);

	if (VAR(var)) {
		for (int w = 1; w < width - 1; w++) {
			ptr[w] = 7;
			ptr[w + pitch * (height - 1)] = 7;
		}

		for (int h = 1; h < height - 1; h++) {
			ptr[h * pitch] = 7;
			ptr[h * pitch + width - 1] = 7;
		}

		// Draw the notes
		int colors[] = { 4, 12, 14, 10, 11, 3, 9, 15 };

		for (int i = 0; i < 4; i++) {
			int note = (VAR(var) >> (4 * i)) & 0x0F;

			if (note >= 2 && note <= 9) {
				_charset->setColor(colors[note - 2]);
				_charset->drawChar(14 + note, *_macScreen, i * 13 + x + 8, y + 4);
			}
		}
	}

	_system->copyRectToScreen(ptr, pitch, x, y, width, height);
}

void ScummEngine::mac_createIndy3TextBox(Actor *a) {
	int width = _macIndy3TextBox->w;
	int height = _macIndy3TextBox->h;

	_macIndy3TextBox->fillRect(Common::Rect(width, height), 0);

	int nameWidth = 0;

	if (a) {
		int oldID = _charset->getCurID();
		_charset->setCurID(2 | 0x80);

		const char *name = (const char *)a->getActorName();
		int charX = 25;

		for (int i = 0; name[i] && nameWidth < width - 50; i++) {
			_charset->drawChar(name[i], *_macIndy3TextBox, charX, 0);
			nameWidth += _charset->getCharWidth(name[i]);
			charX += _charset->getCharWidth(name[i]);
		}

		_charset->drawChar(':', *_macIndy3TextBox, charX, 0);
		_charset->setCurID(oldID);
	}

	if (nameWidth) {
		_macIndy3TextBox->hLine(2, 3, 20, 15);
		_macIndy3TextBox->hLine(32 + nameWidth, 3, width - 3, 15);
	} else
		_macIndy3TextBox->hLine(2, 3, width - 3, 15);

	_macIndy3TextBox->vLine(1, 4, height - 3, 15);
	_macIndy3TextBox->vLine(width - 2, 4, height - 3, 15);
	_macIndy3TextBox->hLine(2, height - 2, width - 3, 15);
}

void ScummEngine::mac_drawIndy3TextBox() {
	// The first two rows of the text box are padding for font rendering.
	// They are not drawn to the screen.

	int x = 96;
	int y = 32;
	int w = _macIndy3TextBox->w;
	int h = _macIndy3TextBox->h - 2;

	// The text box is drawn to the Mac screen and text surface, as if it
	// had been one giant glyph. Note that it will be drawn on the main
	// virtual screen, but we still pretend it's on the text one.

	byte *ptr = (byte *)_macIndy3TextBox->getBasePtr(0, 2);
	int pitch = _macIndy3TextBox->pitch;

	_macScreen->copyRectToSurface(ptr, pitch, x, y, w, h);
	_textSurface.fillRect(Common::Rect(x, y, x + w, y + h), 0);

	mac_markScreenAsDirty(x, y, w, h);
}

void ScummEngine::mac_undrawIndy3TextBox() {
	int x = 96;
	int y = 32;
	int w = _macIndy3TextBox->w;
	int h = _macIndy3TextBox->h - 2;

	_macScreen->fillRect(Common::Rect(x, y, x + w, y + h), 0);
	_textSurface.fillRect(Common::Rect(x, y, x + w, y + h), CHARSET_MASK_TRANSPARENCY);

	mac_markScreenAsDirty(x, y, w, h);
}

void ScummEngine::mac_undrawIndy3CreditsText() {
	// Set _masMask to make the text clear, and _textScreenID to ensure
	// that it's the main area that's cleared.
	_charset->_hasMask = true;
	_charset->_textScreenID = kMainVirtScreen;
	restoreCharsetBg();
}

void ScummEngine::mac_drawBorder(int x, int y, int w, int h, byte color) {
	_macScreen->hLine(x + 2, y, x + w - 2, 0);
	_macScreen->hLine(x + 2, y + h - 1, x + w - 2, 0);
	_macScreen->vLine(x, y + 2, y + h - 3, 0);
	_macScreen->vLine(x + w, y + 2, y + h - 3, 0);
	_macScreen->setPixel(x + 1, y + 1, 0);
	_macScreen->setPixel(x + w - 1, y + 1, 0);
	_macScreen->setPixel(x + 1, y + h - 2, 0);
	_macScreen->setPixel(x + w - 1, y + h - 2, 0);
}

Common::KeyState ScummEngine::mac_showOldStyleBannerAndPause(const char *msg, int32 waitTime) {
	char bannerMsg[512];

	_messageBannerActive = true;

	// Fetch the translated string for the message...
	convertMessageToString((const byte *)msg, (byte *)bannerMsg, sizeof(bannerMsg));

	// Backup the surfaces...
	int x = 70;
	int y = 189;
	int w = 499;
	int h = 22;

	Graphics::Surface backupTextSurface;
	Graphics::Surface backupMacScreen;

	backupTextSurface.create(w + 1, h, Graphics::PixelFormat::createFormatCLUT8());
	backupMacScreen.create(w + 1, h, Graphics::PixelFormat::createFormatCLUT8());

	backupTextSurface.copyRectToSurface(_textSurface, 0, 0, Common::Rect(x, y, x + w + 1, y + h));
	backupMacScreen.copyRectToSurface(*_macScreen, 0, 0, Common::Rect(x, y, x + w + 1, y + h));

	// Pause shake effect
	_shakeTempSavedState = _shakeEnabled;
	setShake(0);

	// Pause the engine
	PauseToken pt = pauseEngine();

	// Backup the current charsetId...
	int oldId = _charset->getCurID();
	_charset->setCurID(1 | 0x80);
	_charset->setColor(0);

	_textSurface.fillRect(Common::Rect(x, y, x + w + 1, y + h), 0);
	_macScreen->fillRect(Common::Rect(x + 1, y + 1, x + w, y + h - 1), 15);
	mac_drawBorder(x, y, w, h, 0);
	mac_drawBorder(x + 2, y + 2, w - 4, h - 4, 0);

	int stringWidth = 0;

	for (int i = 0; msg[i]; i++)
		stringWidth += _charset->getCharWidth(msg[i]);

	int stringX = 1 + x + (w - stringWidth) / 2;

	for (int i = 0; msg[i]; i++) {
		_charset->drawChar(msg[i], *_macScreen, stringX, y + 4);
		stringX += _charset->getCharWidth(msg[i]);
	}

	mac_markScreenAsDirty(x, y, w, h);
	ScummEngine::drawDirtyScreenParts();

	Common::KeyState ks = Common::KEYCODE_INVALID;
	bool leftBtnPressed = false, rightBtnPressed = false;
	if (waitTime) {
		waitForBannerInput(waitTime, ks, leftBtnPressed, rightBtnPressed);
	}

	// Restore the surfaces...
	_textSurface.copyRectToSurface(backupTextSurface, x, y, Common::Rect(0, 0, w + 1, h));
	_macScreen->copyRectToSurface(backupMacScreen, x, y, Common::Rect(0, 0, w + 1, h));

	backupTextSurface.free();
	backupMacScreen.free();

	// Notify the gfx system that we restored the surfaces...
	mac_markScreenAsDirty(x, y, w + 1, h);
	ScummEngine::drawDirtyScreenParts();

	// Finally, resume the engine, clear the input state, and restore the charset.
	pt.clear();
	clearClickedStatus();

	_charset->setCurID(oldId);

	_messageBannerActive = false;

	return ks;
}

// ===========================================================================
// The infamous verb GUI for the Macintosh version of Indiana Jones and the
// Last Crusade.
//
// It's likely that the original interpreter used more hooks from the engine
// into the GUI. In particular, the inventory script uses a variable that I
// haven't been able to find in any of the early scripts of the game.
//
// But the design goal here is to keep things as simple as possible, even if
// that means using brute force. So the GUI figures out which verbs are active
// by scanning all the verbs, and which objects are in the inventory by
// scanning all objects.
//
// We used to coerce the Mac verb GUI into something that looked like the
// GUI from all other versions. This used a number of variables and hard-coded
// verbs. The only thing still used of all this is variable 67, to keep track
// of the inventory scroll position. The fake verbs are removed when loading
// old savegames, but the variables are assumed to be harmless.
// ===========================================================================

#define WIDGET_TIMER_JIFFIES	12
#define REPEAT_TIMER_JIFFIES	18

// ---------------------------------------------------------------------------
// The basic building block of the GUI is the Widget. It has a bounding box, a
// timer, a couple of drawing primitives, etc.
// ---------------------------------------------------------------------------

ScummEngine *MacIndy3Gui::Widget::_vm = nullptr;
Graphics::Surface *MacIndy3Gui::Widget::_surface = nullptr;
MacIndy3Gui *MacIndy3Gui::Widget::_gui = nullptr;

MacIndy3Gui::Widget::Widget(int x, int y, int width, int height) {
	_bounds.left = x;
	_bounds.top = y;
	_bounds.right = x + width;
	_bounds.bottom = y + height;
}

void MacIndy3Gui::Widget::reset() {
	clearTimer();
	_enabled = false;
	setRedraw(false);
}

void MacIndy3Gui::Widget::updateTimer(int delta) {
	if (hasTimer()) {
		if (delta > _timer)
			delta = _timer;

		_timer -= delta;

		if (_timer == 0)
			timeOut();
	}
}

void MacIndy3Gui::Widget::draw() {
	markScreenAsDirty(_bounds);
	_redraw = false;
}

void MacIndy3Gui::Widget::undraw() {
	fill(_bounds);
	markScreenAsDirty(_bounds);
	_redraw = false;
}

void MacIndy3Gui::Widget::markScreenAsDirty(Common::Rect r) const {
	_gui->markScreenAsDirty(r);
}

byte MacIndy3Gui::Widget::translateChar(byte c) const {
	if (c == '^')
		return 0xC9;
	return c;
}

void MacIndy3Gui::Widget::fill(Common::Rect r) const {
	_gui->fill(r);
}

void MacIndy3Gui::Widget::drawBitmap(Common::Rect r, const uint16 *bitmap, Color color) const {
	_gui->drawBitmap(r, bitmap, color);
}

// The shadow box is the basic outline of the verb buttons and the inventory
// widget. A slightly rounded rectangle with a shadow and a highlight.

void MacIndy3Gui::Widget::drawShadowBox(Common::Rect r) const {
	_surface->hLine(r.left + 1, r.top, r.right - 3, kBlack);
	_surface->hLine(r.left + 1, r.bottom - 2, r.right - 3, kBlack);
	_surface->vLine(r.left, r.top + 1, r.bottom - 3, kBlack);
	_surface->vLine(r.right - 2, r.top + 1, r.bottom - 3, kBlack);

	_surface->hLine(r.left + 2, r.bottom - 1, r.right - 1, kBlack);
	_surface->vLine(r.right - 1, r.top + 2, r.bottom - 2, kBlack);

	_surface->hLine(r.left + 1, r.top + 1, r.right - 3, kWhite);
	_surface->vLine(r.left + 1, r.top + 2, r.bottom - 3, kWhite);
}

// The shadow frame is a rectangle with a highlight. It can be filled or
// unfilled.

void MacIndy3Gui::Widget::drawShadowFrame(Common::Rect r, Color shadowColor, Color fillColor) const {
	_surface->hLine(r.left, r.top, r.right - 1, kBlack);
	_surface->hLine(r.left, r.bottom - 1, r.right - 1, kBlack);
	_surface->vLine(r.left, r.top + 1, r.bottom - 2, kBlack);
	_surface->vLine(r.right - 1, r.top + 1, r.bottom - 2, kBlack);

	_surface->hLine(r.left + 1, r.top + 1, r.right - 2, shadowColor);
	_surface->vLine(r.left + 1, r.top + 2, r.bottom - 2, shadowColor);

	if (fillColor != kTransparency) {
		Common::Rect fillRect(r.left + 2, r.top + 2, r.right - 1, r.bottom - 1);

		if (fillColor == kBackground)
			fill(fillRect);
		else
			_surface->fillRect(fillRect, fillColor);
	}
}

// ---------------------------------------------------------------------------
// The VerbWidget is what the user interacts with. Each one is connected to a
// verb id and slot. A VerbWidget can consist of several Widgets.
// ---------------------------------------------------------------------------

void MacIndy3Gui::VerbWidget::reset() {
	MacIndy3Gui::Widget::reset();
	_verbslot = -1;
	_visible = false;
	_kill = false;
}

void MacIndy3Gui::VerbWidget::updateVerb(int verbslot) {
	VerbSlot *vs = &_vm->_verbs[verbslot];
	bool enabled = (vs->curmode == 1);

	if (!_visible || _enabled != enabled)
		setRedraw(true);

	_verbslot = verbslot;
	_verbid = vs->verbid;
	_enabled = enabled;
	_kill = false;
}

void MacIndy3Gui::VerbWidget::draw() {
	Widget::draw();
	_visible = true;
}

void MacIndy3Gui::VerbWidget::undraw() {
	debug(1, "VerbWidget: Undrawing [%d]", _verbid);

	Widget::undraw();
	_visible = false;
}

// ---------------------------------------------------------------------------
// The most common type of VerbWidget is the button, which is used for verbs
// and conversation options.
// ---------------------------------------------------------------------------

void MacIndy3Gui::Button::reset() {
	MacIndy3Gui::VerbWidget::reset();
	_text.clear();
}

bool MacIndy3Gui::Button::handleEvent(Common::Event &event) {
	if (!_enabled || !_verbid)
		return false;

	VerbSlot *vs = &_vm->_verbs[_verbslot];

	if (vs->saveid)
		return false;

	bool caughtEvent = false;

	if (event.type == Common::EVENT_KEYDOWN) {
		if (!event.kbd.hasFlags(Common::KBD_NON_STICKY) && event.kbd.keycode == vs->key)
			caughtEvent = true;
	} else if (event.type == Common::EVENT_LBUTTONDOWN) {
		if (_bounds.contains(event.mouse))
			caughtEvent = true;
	}

	// Events are handled at the end of the animation. This blatant attack
	// on speedrunners all over the world was done because that's what the
	// original seems to do, and it looks better. Based on tests in Mac
	// emulators, the speed of the animation depended on the speed of your
	// computer, so we just set something that looks good here.

	if (caughtEvent) {
		setRedraw(true);
		setTimer(WIDGET_TIMER_JIFFIES);
	}

	return caughtEvent;
}

void MacIndy3Gui::Button::timeOut() {
	if (_visible) {
		_vm->runInputScript(kVerbClickArea, _verbid, 1);
		setRedraw(true);
	}
}

void MacIndy3Gui::Button::updateVerb(int verbslot) {
	MacIndy3Gui::VerbWidget::updateVerb(verbslot);

	const byte *ptr = _vm->getResourceAddress(rtVerb, verbslot);
	byte buf[270];

	_vm->convertMessageToString(ptr, buf, sizeof(buf));
	if (_text != (char *)buf) {
		_text = (char *)buf;
		clearTimer();
		setRedraw(true);
	}
}

void MacIndy3Gui::Button::draw() {
	if (!getRedraw())
		return;

	debug(1, "Button: Drawing [%d] %s", _verbid, _text.c_str());

	MacIndy3Gui::VerbWidget::draw();
	fill(_bounds);

	if (!hasTimer()) {
		drawShadowBox(_bounds);
	} else {
		// I have only been able to capture a screenshot of the pressed
		// button in black and white, where the checkerboard background
		// makes it hard to see exactly which pixels should be drawn.
		// Basilisk II runs it too fast, and I haven't gotten Mini vMac
		// to run it in 16-color mode.
		//
		// All I can say for certain is that the upper left corner is
		// rounded while the lower right is not. I'm going to assume
		// that the shadow is always drawn, and the rest of the button
		// is just shifted down to the right. That would make the other
		// two corners rounded, so only the lower right one isn't.

		int x0 = _bounds.left + 1;
		int x1 = _bounds.right - 1;
		int y0 = _bounds.top + 1;
		int y1 = _bounds.bottom - 1;

		_surface->hLine(x0 + 1, y0, x1 - 1, kBlack);
		_surface->hLine(x0 + 1, y1, x1, kBlack);
		_surface->vLine(x0, y0 + 1, y1 - 1, kBlack);
		_surface->vLine(x1, y0 + 1, y1 - 1, kBlack);

		_surface->hLine(x0 + 1, y0 + 1, x1 - 1, kWhite);
		_surface->vLine(x0 + 1, y0 + 2, y1 - 1, kWhite);
	}

	// The text is drawn centered. Based on experimentation, I think the
	// width is always based on the outlined font, and the button shadow is
	// not counted as part of the button width.
	//
	// This gives us pixel perfect rendering for the English verbs.

	if (!_text.empty()) {
		const Graphics::Font *boldFont = _gui->getFont(kBold);
		const Graphics::Font *outlineFont = _gui->getFont(kOutline);

		int stringWidth = 0;
		for (uint i = 0; i < _text.size(); i++)
			stringWidth += outlineFont->getCharWidth(_text[i]);

		int x = (_bounds.left + (_bounds.width() - 1 - stringWidth) / 2) - 1;
		int y = _bounds.top + 2;
		Color color = _enabled ? kWhite : kBlack;

		if (hasTimer()) {
			x++;
			y++;
		}

		for (uint i = 0; i < _text.size() && x < _bounds.right; i++) {
			byte c = translateChar(_text[i]);
			if (x >= _bounds.left) {
				if (_enabled)
					outlineFont->drawChar(_surface, c, x, y, kBlack);
				boldFont->drawChar(_surface, c, x + 1, y, color);
			}
			x += boldFont->getCharWidth(c);
		}
	}
}

// ---------------------------------------------------------------------------
// Unlike in the DOS version, where each inventory object shown on screen is
// its own verb, in the Macintosh version the entire Inventory widget is one
// single verb. It consists of the widget itself, the inventory slots, and
// the scrollbar.
// ---------------------------------------------------------------------------

MacIndy3Gui::Inventory::Inventory(int x, int y, int width, int height) : MacIndy3Gui::VerbWidget(x, y, width, height) {
	x = _bounds.left + 6;
	y = _bounds.top + 6;

	// There are always six slots, no matter how many objects you are
	// carrying.
	//
	// Each slot is 12 pixels tall (as seen when they are highlighted),
	// which means they have to overlap slightly to fit. It is assumed
	// that this will never interfere with the text drawing.

	for (int i = 0; i < ARRAYSIZE(_slots); i++) {
		_slots[i] = new Slot(i, x, y, 128, 12);
		y += 11;
	}

	x = _bounds.right - 20;

	_scrollBar = new ScrollBar(x, _bounds.top + 19, 16, 40);

	_scrollButtons[0] = new ScrollButton(x, _bounds.top + 4, 16, 16, kScrollUp);
	_scrollButtons[1] = new ScrollButton(x, _bounds.bottom - 20, 16, 16, kScrollDown);
}

MacIndy3Gui::Inventory::~Inventory() {
	for (int i = 0; i < ARRAYSIZE(_slots); i++)
		delete _slots[i];

	delete _scrollBar;

	for (int i = 0; i < ARRAYSIZE(_scrollButtons); i++)
		delete _scrollButtons[i];
}

void MacIndy3Gui::Inventory::reset() {
	MacIndy3Gui::VerbWidget::reset();

	for (int i = 0; i < ARRAYSIZE(_slots); i++)
		_slots[i]->reset();

	_scrollBar->reset();

	for (int i = 0; i < ARRAYSIZE(_scrollButtons); i++)
		_scrollButtons[i]->reset();
}

void MacIndy3Gui::Inventory::setRedraw(bool redraw) {
	MacIndy3Gui::Widget::setRedraw(redraw);

	for (int i = 0; i < ARRAYSIZE(_slots); i++)
		_slots[i]->setRedraw(redraw);

	_scrollBar->setRedraw(redraw);

	for (int i = 0; i < ARRAYSIZE(_scrollButtons); i++)
		_scrollButtons[i]->setRedraw(redraw);
}

bool MacIndy3Gui::Inventory::handleEvent(Common::Event &event) {
	if (!_enabled || !_verbid || event.type != Common::EVENT_LBUTTONDOWN)
		return false;

	for (int i = 0; i < ARRAYSIZE(_slots); i++) {
		if (_slots[i]->handleEvent(event))
			return true;
	}

	for (int i = 0; i < ARRAYSIZE(_scrollButtons); i++) {
		ScrollButton *b = _scrollButtons[i];

		// Scrolling is done by one object at a time, though you can
		// hold down the mouse button to repeat.

		if (b->handleEvent(event)) {
			_scrollBar->scroll(b->_direction);
			return true;
		}
	}

	if (_scrollBar->handleEvent(event))
		return true;

	return false;
}

bool MacIndy3Gui::Inventory::handleMouseHeld(Common::Point &pressed, Common::Point &held) {
	if (!_enabled || !_verbid)
		return false;

	for (int i = 0; i < ARRAYSIZE(_slots); i++) {
		if (_slots[i]->handleMouseHeld(pressed, held))
			return true;
	}

	for (int i = 0; i < ARRAYSIZE(_scrollButtons); i++) {
		ScrollButton *b = _scrollButtons[i];

		if (b->handleMouseHeld(pressed, held)) {
			_scrollBar->scroll(b->_direction);
			return true;
		}
	}

	// It would be possible to handle dragging the scrollbar handle, but
	// the original didn't.

	if (_scrollBar->handleMouseHeld(pressed, held))
		return true;

	return false;
}

void MacIndy3Gui::Inventory::updateTimer(int delta) {
	Widget::updateTimer(delta);

	for (int i = 0; i < ARRAYSIZE(_slots); i++)
		_slots[i]->updateTimer(delta);

	_scrollBar->updateTimer(delta);

	for (int i = 0; i < ARRAYSIZE(_scrollButtons); i++)
		_scrollButtons[i]->updateTimer(delta);
}

void MacIndy3Gui::Inventory::updateVerb(int verbslot) {
	MacIndy3Gui::VerbWidget::updateVerb(verbslot);

	int owner = _vm->VAR(_vm->VAR_EGO);

	int invCount = _vm->getInventoryCount(owner);
	int invOffset = _gui->getInventoryScrollOffset();
	int numSlots = ARRAYSIZE(_slots);

	// The scroll offset must be non-negative and if there are numSlots or
	// less objects in the inventory, the inventory is fixed in the top
	// position.

	if (invOffset < 0 || invCount <= numSlots)
		invOffset = 0;

	// If there are more than numSlots objects in the inventory, clamp the
	// scroll offset so that the inventory does not go past the last
	// numSlots objets.

	if (invCount > numSlots && invOffset > invCount - numSlots)
		invOffset = invCount - numSlots;

	_scrollButtons[0]->setEnabled(invOffset > 0);
	_scrollButtons[1]->setEnabled(invCount > numSlots && invOffset < invCount - numSlots);

	_scrollBar->setEnabled(invCount > numSlots);
	_scrollBar->setInventoryParameters(invCount, invOffset);

	_gui->setInventoryScrollOffset(invOffset);

	int invSlot = 0;

	// Assign the objects to the inventory slots

	for (int i = 0; i < _vm->_numInventory && invSlot < numSlots; i++) {
		int obj = _vm->_inventory[i];
		if (obj && _vm->getOwner(obj) == owner) {
			if (--invOffset < 0) {
				_slots[invSlot]->setObject(obj);
				invSlot++;
			}
		}
	}

	// Clear the remaining slots

	for (int i = invSlot; i < numSlots; i++)
		_slots[i]->clearObject();
}

void MacIndy3Gui::Inventory::draw() {
	if (getRedraw()) {
		debug(1, "Inventory: Drawing [%d]", _verbid);

		MacIndy3Gui::VerbWidget::draw();

		drawShadowBox(_bounds);
		drawShadowFrame(Common::Rect(_bounds.left + 4, _bounds.top + 4, _bounds.right - 22, _bounds.bottom - 4), kBlack, kWhite);

		const uint16 upArrow[] = {
			0x0000, 0x0000, 0x0000, 0x0080,
			0x0140, 0x0220, 0x0410, 0x0808,
			0x1C1C, 0x0410, 0x0410, 0x0410,
			0x07F0, 0x0000, 0x0000, 0x0000
		};

		const uint16 downArrow[] = {
			0x0000, 0x0000, 0x0000, 0x0000,
			0x07F0, 0x0410, 0x0410, 0x0410,
			0x1C1C, 0x0808, 0x0410, 0x0220,
			0x0140, 0x0080, 0x0000, 0x0000
		};

		for (int i = 0; i < ARRAYSIZE(_scrollButtons); i++) {
			ScrollButton *s = _scrollButtons[i];
			const uint16 *arrow = (s->_direction == kScrollUp) ? upArrow : downArrow;

			drawShadowFrame(s->_bounds, kWhite, kTransparency);
			drawBitmap(s->_bounds, arrow, kBlack);
			s->draw();
		}
	}

	// Since the inventory slots overlap, draw the highlighted ones (and
	// there should really only be one at a time) last.

	for (int i = 0; i < ARRAYSIZE(_slots); i++) {
		if (!_slots[i]->hasTimer())
			_slots[i]->draw();
	}

	for (int i = 0; i < ARRAYSIZE(_slots); i++) {
		if (_slots[i]->hasTimer())
			_slots[i]->draw();
	}

	_scrollBar->draw();

	for (int i = 0; i < ARRAYSIZE(_scrollButtons); i++)
		_scrollButtons[i]->draw();
}

// ---------------------------------------------------------------------------
// Inventory::Slot is a widget for a single inventory object.
// ---------------------------------------------------------------------------

MacIndy3Gui::Inventory::Slot::Slot(int slot, int x, int y, int width, int height) : MacIndy3Gui::Widget(x, y, width, height) {
	_slot = slot;
}

void MacIndy3Gui::Inventory::Slot::reset() {
	Widget::reset();
	clearName();
	clearObject();
}

void MacIndy3Gui::Inventory::Slot::clearObject() {
	_obj = -1;
	setEnabled(false);

	if (hasName()) {
		clearName();
		setRedraw(true);
	}
}

void MacIndy3Gui::Inventory::Slot::setObject(int obj) {
	_obj = obj;

	const byte *ptr = _vm->getObjOrActorName(obj);

	if (ptr) {
		byte buf[270];
		_vm->convertMessageToString(ptr, buf, sizeof(buf));

		if (_name != (const char *)buf) {
			setEnabled(true);
			_name = (const char *)buf;
			clearTimer();
			setRedraw(true);
		}
	} else if (hasName()) {
		setEnabled(false);
		clearName();
		clearTimer();
		setRedraw(true);
	}
}

bool MacIndy3Gui::Inventory::Slot::handleEvent(Common::Event &event) {
	if (!_enabled || event.type != Common::EVENT_LBUTTONDOWN)
		return false;

	if (_bounds.contains(event.mouse)) {
		setRedraw(true);
		if (hasTimer())
			timeOut();
		setTimer(WIDGET_TIMER_JIFFIES);
		return true;
	}

	return false;
}

void MacIndy3Gui::Inventory::Slot::timeOut() {
	_vm->runInputScript(kInventoryClickArea, getObject(), 1);
	setRedraw(true);
}

void MacIndy3Gui::Inventory::Slot::draw() {
	if (!getRedraw())
		return;

	debug(1, "Inventory::Slot: Drawing [%d] %s", _slot, _name.c_str());

	Widget::draw();

	Color fg, bg;

	if (hasTimer()) {
		fg = kWhite;
		bg = kBlack;
	} else {
		fg = kBlack;
		bg = kWhite;
	}

	_surface->fillRect(_bounds, bg);

	if (hasName()) {
		const Graphics::Font *font = _gui->getFont(kRegular);

		int y = _bounds.top - 1;
		int x = _bounds.left + 4;

		for (uint i = 0; i < _name.size() && x < _bounds.right; i++) {
			byte c = translateChar(_name[i]);

			font->drawChar(_surface, c, x, y, fg);
			x += font->getCharWidth(c);
		}
	}
}

// ---------------------------------------------------------------------------
// Inventory::ScrollBar is the slider which shows if the inventory contains
// more objects than are visible on screen.
// ---------------------------------------------------------------------------

// NB: This class makes several references to ARRAYSIZE(_slots), but accessing
//     members of the enclosing class like that should be ok in C++11.

MacIndy3Gui::Inventory::ScrollBar::ScrollBar(int x, int y, int width, int height) : MacIndy3Gui::Widget(x, y, width, height) {
}

bool MacIndy3Gui::Inventory::ScrollBar::handleEvent(Common::Event &event) {
	if (!_enabled || event.type != Common::EVENT_LBUTTONDOWN)
		return false;

	// Clicking on the scrollbar scrolls it to the top or the bottom, not
	// one page as one might suspect. Though you're rarely carrying enough
	// objects for this to make a difference.
	//
	// The direction depends on if you click above or below the handle.
	// Clicking on the handle also works, though the behavior strikes me
	// as a bit unintuitive. If you click on Y coordinate pos + 5, nothing
	// happens at all.

	if (_bounds.contains(event.mouse)) {
		int pos = _bounds.top + getHandlePosition();

		if (event.mouse.y <= pos + 4)
			_invOffset = 0;
		else if (event.mouse.y >= pos + 6)
			_invOffset = _invCount - ARRAYSIZE(_slots);

		_gui->setInventoryScrollOffset(_invOffset);
		setRedraw(true);
	}

	return false;
}

void MacIndy3Gui::Inventory::ScrollBar::setInventoryParameters(int invCount, int invOffset) {
	if (invOffset != _invOffset)
		setRedraw(true);

	if (invCount != _invCount && _invCount >= ARRAYSIZE(_slots))
		setRedraw(true);

	_invCount = invCount;
	_invOffset = invOffset;
}

void MacIndy3Gui::Inventory::ScrollBar::scroll(ScrollDirection dir) {
	int newOffset = _invOffset;
	int maxOffset = _invCount - ARRAYSIZE(_slots);

	if (dir == kScrollUp)
		newOffset--;
	else
		newOffset++;

	if (newOffset < 0)
		newOffset = 0;
	else if (newOffset > maxOffset)
		newOffset = maxOffset;

	if (newOffset != _invOffset) {
		_invOffset = newOffset;
		_gui->setInventoryScrollOffset(_invOffset);
		setRedraw(true);
	}
}

int MacIndy3Gui::Inventory::ScrollBar::getHandlePosition() {
	if (_invOffset == 0)
		return 0;

	// Hopefully this matches the original scroll handle position.

	int maxPos = _bounds.height() - 8;
	int maxOffset = _invCount - ARRAYSIZE(_slots);

	if (_invOffset >= maxOffset)
		return maxPos;

	return maxPos * _invOffset / maxOffset;
}

void MacIndy3Gui::Inventory::ScrollBar::reset() {
	MacIndy3Gui::Widget::reset();
	_invCount = 0;
	_invOffset = 0;
}

void MacIndy3Gui::Inventory::ScrollBar::draw() {
	if (!getRedraw())
		return;

	debug(1, "Inventory::Scrollbar: Drawing");

	Widget::draw();
	drawShadowFrame(_bounds, kBlack, kBackground);

	// The scrollbar handle is only drawn when there are enough inventory
	// objects to scroll.

	if (_enabled) {
		debug(1, "Inventory::Scrollbar: Drawing handle");

		int y = _bounds.top + getHandlePosition();

		// The height of the scrollbar handle never changes, regardless
		// of how many items you are carrying.
		drawShadowFrame(Common::Rect(_bounds.left, y, _bounds.right, y + 8), kWhite, kTransparency);
	}

	setRedraw(false);
	markScreenAsDirty(_bounds);
}

// ---------------------------------------------------------------------------
// Inventory::ScrollButton is the buttons used to scroll the inventory up and
// down. They're only responsible for drawing the filled part of the arrow,
// since the rest of the buttons are drawn by the Inventory widget itself.
// ---------------------------------------------------------------------------

MacIndy3Gui::Inventory::ScrollButton::ScrollButton(int x, int y, int width, int height, ScrollDirection direction) : MacIndy3Gui::Widget(x, y, width, height) {
	_direction = direction;
}

bool MacIndy3Gui::Inventory::ScrollButton::handleEvent(Common::Event &event) {
	if (!_enabled || event.type != Common::EVENT_LBUTTONDOWN)
		return false;

	if (_bounds.contains(event.mouse)) {
		setRedraw(true);
		setTimer(WIDGET_TIMER_JIFFIES);
		return true;
	}

	return false;
}

bool MacIndy3Gui::Inventory::ScrollButton::handleMouseHeld(Common::Point &pressed, Common::Point &held) {
	if (!_enabled)
		return false;

	// The scroll button doesn't care if the mouse has moved outside while
	// being held.

	return _bounds.contains(pressed);
}

void MacIndy3Gui::Inventory::ScrollButton::timeOut() {
	// Nothing happens, but the button changes state.
	setRedraw(true);
}

void MacIndy3Gui::Inventory::ScrollButton::draw() {
	if (!getRedraw())
		return;

	debug(1, "Inventory::ScrollButton: Drawing [%d]", _direction);

	Widget::draw();

	const uint16 upArrow[] = {
		0x0000, 0x0000, 0x0000, 0x0000,
		0x0080, 0x01C0, 0x03E0, 0x07F0,
		0x03E0, 0x03E0, 0x03E0, 0x03E0,
		0x0000, 0x0000, 0x0000, 0x0000
	};

	const uint16 downArrow[] = {
		0x0000, 0x0000, 0x0000, 0x0000,
		0x0000, 0x03E0, 0x03E0, 0x03E0,
		0x03E0, 0x07F0,	0x03E0, 0x01C0,
		0x0080, 0x0000, 0x0000, 0x0000
	};

	const uint16 *arrow = (_direction == kScrollUp) ? upArrow : downArrow;
	Color color = hasTimer() ? kBlack : kWhite;

	drawBitmap(_bounds, arrow, color);

	setRedraw(false);
	markScreenAsDirty(_bounds);
}

// ---------------------------------------------------------------------------
// The MacIndy3Gui class ties the whole thing together, mostly by delegating
// the work to the individual widgets.
// ---------------------------------------------------------------------------

MacIndy3Gui::MacIndy3Gui(OSystem *system, ScummEngine *vm) :
	_system(system), _vm(vm), _surface(vm->_macScreen), _visible(false) {

	// There is one widget for every verb in the game. Verbs include the
	// inventory widget and conversation options.

	Widget::_vm = _vm;
	Widget::_surface = _surface;
	Widget::_gui = this;

	for (int i = 0; i < ARRAYSIZE(_fonts); i++)
		_fonts[i] = nullptr;

	_widgets[  1] = new Button(137, 312,  68, 18); // Open
	_widgets[  2] = new Button(137, 332,  68, 18); // Close
	_widgets[  3] = new Button( 67, 352,  68, 18); // Give
	_widgets[  4] = new Button(277, 332,  68, 18); // Turn on
	_widgets[  5] = new Button(277, 352,  68, 18); // Turn off
	_widgets[  6] = new Button( 67, 312,  68, 18); // Push
	_widgets[  7] = new Button( 67, 332,  68, 18); // Pull
	_widgets[  8] = new Button(277, 312,  68, 18); // Use
	_widgets[  9] = new Button(137, 352,  68, 18); // Look at
	_widgets[ 10] = new Button(207, 312,  68, 18); // Walk to
	_widgets[ 11] = new Button(207, 332,  68, 18); // Pick up
	_widgets[ 12] = new Button(207, 352,  68, 18); // What is
	_widgets[ 13] = new Button(347, 312,  68, 18); // Talk
	_widgets[ 14] = new Button( 97, 312, 121, 18); // Never mind.
	_widgets[ 32] = new Button(347, 332,  68, 18); // Travel
	_widgets[ 33] = new Button(347, 352,  68, 18); // To Indy
	_widgets[ 34] = new Button(347, 352,  68, 18); // To Henry
	_widgets[ 90] = new Button( 67, 292, 507, 18); // Travel 1
	_widgets[ 91] = new Button( 67, 312, 507, 18); // Travel 2
	_widgets[ 92] = new Button( 67, 332, 507, 18); // Travel 3
	_widgets[100] = new Button( 67, 292, 348, 18); // Sentence
	_widgets[101] = new Inventory(417, 292, 157, 78);
	_widgets[119] = new Button(324, 312,  91, 18); // Take this:
	_widgets[120] = new Button( 67, 292, 507, 18); // Converse 1
	_widgets[121] = new Button( 67, 312, 507, 18); // Converse 2
	_widgets[122] = new Button( 67, 332, 507, 18); // Converse 3
	_widgets[123] = new Button( 67, 352, 507, 18); // Converse 4
	_widgets[124] = new Button( 67, 352, 151, 18); // Converse 5
	_widgets[125] = new Button(423, 352, 151, 18); // Converse 6

	for (auto &it: _widgets)
		it._value->setVerbid(it._key);

	_dirtyRects.clear();
}

MacIndy3Gui::~MacIndy3Gui() {
	for (auto &it: _widgets)
		delete it._value;
}

// Before the GUI rewrite, the scroll offset was saved in variable 67. Let's
// continue that tradition, just in case. If nothing else, it gives us an easy
// way to still store it in savegames.

int MacIndy3Gui::getInventoryScrollOffset() const {
	return _vm->VAR(67);
}

void MacIndy3Gui::setInventoryScrollOffset(int n) const {
	_vm->VAR(67) = n;
}

bool MacIndy3Gui::isVerbGuiAllowed() const {
	// The GUI is only allowed if the verb area has the expected size. That
	// really seems to be all that's needed.

	VirtScreen *vs = &_vm->_virtscr[kVerbVirtScreen];
	if (vs->topline != 144 || vs->h != 56)
		return false;

	return true;
}

bool MacIndy3Gui::isVerbGuiActive() const {
	// The visibility flag may not have been updated yet, so better check
	// that the GUI is still allowed.

	return _visible && isVerbGuiAllowed();
}

const Graphics::Font *MacIndy3Gui::getFont(FontId fontId) {
	if (!_fonts[fontId]) {
		int id = Graphics::kMacFontGeneva;
		int size = 9;
		int slant = Graphics::kMacFontRegular;

		switch (fontId) {
		case kRegular:
			break;

		case kBold:
			slant = Graphics::kMacFontBold;
			break;

		case kOutline:
			slant = Graphics::kMacFontBold | Graphics::kMacFontOutline | Graphics::kMacFontCondense;
			break;

		default:
			error("MacIndy3Gui: getFont: Unknown font id %d", fontId);
		}

		_fonts[fontId] = _vm->_macFontManager->getFont(Graphics::MacFont(id, size, slant));
	}

	return _fonts[fontId];
}

void MacIndy3Gui::reset() {
	_visible = false;

	for (auto &it: _widgets)
		it._value->reset();
}

void MacIndy3Gui::resetAfterLoad() {
	reset();

	// In the DOS version, verb ID 102-106 were used for the visible
	// inventory items, and 107-108 for inventory arrow buttons. In the
	// Macintosh version, the entire inventory widget is verb ID 101.
	//
	// In old savegames, the DOS verb IDs may still be present, and have
	// to be removed.

	for (int i = 0; i < _vm->_numVerbs; i++) {
		if (_vm->_verbs[i].verbid >= 102 && _vm->_verbs[i].verbid <= 108)
			_vm->killVerb(i);
	}
}

void MacIndy3Gui::update(int delta) {
	if (isVerbGuiAllowed() && updateVerbs(delta)) {
		if (!_visible)
			show();

		updateMouseHeldTimer(delta);
		drawVerbs();
	} else {
		if (_visible)
			hide();
	}

	copyDirtyRectsToScreen();
}

bool MacIndy3Gui::updateVerbs(int delta) {
	// Tentatively mark the verb widgets for removal. Any widget that wants
	// to stay has to say so.

	for (auto &it: _widgets) {
		VerbWidget *w = it._value;

		if (delta > 0)
			w->updateTimer(delta);

		w->threaten();
	}

	bool hasActiveVerbs = false;

	// Collect all active verbs. Verb slot 0 is special, apparently, so we
	// don't look at that one.

	for (int i = 1; i < _vm->_numVerbs; i++) {
		VerbSlot *vs = &_vm->_verbs[i];

		if (!vs->saveid && vs->curmode && vs->verbid) {
			VerbWidget *w = _widgets.getValOrDefault(vs->verbid);

			if (w) {
				w->updateVerb(i);
				hasActiveVerbs = true;
			} else {
				const byte *ptr = _vm->getResourceAddress(rtVerb, i);
				byte buf[270];
				_vm->convertMessageToString(ptr, buf, sizeof(buf));
				warning("MacIndy3Gui: Unknown verb: %d %s", vs->verbid, buf);
			}
		}
	}

	return hasActiveVerbs;
}

void MacIndy3Gui::updateMouseHeldTimer(int delta) {
	if (delta > 0 && _leftButtonIsPressed) {
		_timer -= delta;

		if (_timer <= 0) {
			debug(2, "MacIndy3Gui: Left button still down");

			_timer = REPEAT_TIMER_JIFFIES;

			for (auto &it: _widgets) {
				if (it._value->handleMouseHeld(_leftButtonPressed, _leftButtonHeld))
					break;
			}
		}
	}
}

void MacIndy3Gui::drawVerbs() {
	// The possible verbs overlap each other. Remove the dead ones first, then draw the live ones.

	for (auto &it: _widgets) {
		VerbWidget *w = it._value;

		if (w->isDying() && w->isVisible()) {
			w->undraw();
			w->reset();
		}
	}

	for (auto &it: _widgets) {
		VerbWidget *w = it._value;

		if (w->hasVerb())
			w->draw();
	}
}

void MacIndy3Gui::handleEvent(Common::Event &event) {
	if (!isVerbGuiActive() || _vm->_userPut <= 0)
		return;

	if (event.type == Common::EVENT_LBUTTONDOWN) {
		if (!_leftButtonIsPressed) {
			debug(2, "MacIndy3Gui: Left button down");

			_leftButtonIsPressed = true;
			_leftButtonPressed = event.mouse;
			_leftButtonHeld = event.mouse;
			_timer = REPEAT_TIMER_JIFFIES;
		}
	} else if (event.type == Common::EVENT_LBUTTONUP) {
		if (_leftButtonIsPressed) {
			debug(2, "MacIndy3Gui: Left button up");

			_leftButtonIsPressed = false;
			_timer = 0;
		}
	} else if (event.type == Common::EVENT_MOUSEMOVE) {
		if (_leftButtonIsPressed)
			_leftButtonHeld = event.mouse;
	}

	// It probably doesn't make much of a difference, but if a widget
	// responds to an event, and marks itself as wanting to be redraw,
	// we do that redrawing immediately, not on the next update.

	for (auto &it: _widgets) {
		Widget *w = it._value;

		if (w->handleEvent(event)) {
			if (w->getRedraw()) {
				w->draw();
				copyDirtyRectsToScreen();
			}
			break;
		}
	}
}

void MacIndy3Gui::show() {
	if (_visible)
		return;

	debug(1, "MacIndy3Gui: Showing");

	_visible = true;

	_surface->fillRect(Common::Rect(0, 288, 640, 289), kBlack);
	_surface->fillRect(Common::Rect(0, 373, 640, 400), kBlack);

	fill(Common::Rect(0, 290, 640, 373));

	const uint16 ulCorner[] = { 0xF000, 0xC000, 0x8000, 0x8000 };
	const uint16 urCorner[] = { 0xF000, 0x3000, 0x1000, 0x1000 };
	const uint16 llCorner[] = { 0x8000, 0x8000, 0xC000, 0xF000 };
	const uint16 lrCorner[] = { 0x1000, 0x1000, 0x3000, 0xF000 };

	drawBitmap(Common::Rect(  0, 290,   4, 294), ulCorner, kBlack);
	drawBitmap(Common::Rect(636, 290, 640, 294), urCorner, kBlack);
	drawBitmap(Common::Rect(  0, 369,   4, 373), llCorner, kBlack);
	drawBitmap(Common::Rect(636, 369, 640, 373), lrCorner, kBlack);

	markScreenAsDirty(Common::Rect(0, 288, 640, 400));
}

void MacIndy3Gui::hide() {
	if (!_visible)
		return;

	debug(1, "MacIndy3Gui: Hiding");

	_leftButtonIsPressed = false;
	_timer = 0;

	reset();

	if (isVerbGuiAllowed()) {
		_surface->fillRect(Common::Rect(0, 288, 640, 400), kBlack);
		markScreenAsDirty(Common::Rect(0, 288, 640, 400));
	}
}

void MacIndy3Gui::markScreenAsDirty(Common::Rect r) {
	// As long as we always call this with the most encompassing rect
	// first, it is trivial to filter out unnecessary calls.

	for (uint i = 0; i < _dirtyRects.size(); i++) {
		if (_dirtyRects[i].contains(r))
			return;
	}

	_dirtyRects.push_back(r);
}

void MacIndy3Gui::copyDirtyRectsToScreen() {
	for (uint i = 0; i < _dirtyRects.size(); i++) {
		_system->copyRectToScreen(
			_surface->getBasePtr(_dirtyRects[i].left, _dirtyRects[i].top),
			_surface->pitch,
			_dirtyRects[i].left, _dirtyRects[i].top,
			_dirtyRects[i].width(), _dirtyRects[i].height());
	}

	_dirtyRects.clear();
}

void MacIndy3Gui::fill(Common::Rect r) const {
	int pitch = _surface->pitch;

	// Fill the screen with either gray of a checkerboard pattern.

	if (_vm->_renderMode == Common::kRenderMacintoshBW) {
		byte *row = (byte *)_surface->getBasePtr(r.left, r.top);

		for (int y = r.top; y < r.bottom; y++) {
			byte *ptr = row;
			for (int x = r.left; x < r.right; x++)
				*ptr++ = ((x + y) & 1) ? kWhite : kBlack;
			row += pitch;
		}
	} else
		_surface->fillRect(r, kLightGray);
}

void MacIndy3Gui::drawBitmap(Common::Rect r, const uint16 *bitmap, Color color) const {
	byte *ptr = (byte *)_surface->getBasePtr(r.left, r.top);
	int pitch = _surface->pitch;

	assert(r.width() <= 16);

	for (int y = 0; y < r.height(); y++) {
		uint16 bit = 0x8000;
		for (int x = 0; x < r.width(); x++) {
			if (bitmap[y] & bit)
				ptr[x] = color;
			bit >>= 1;
		}
		ptr += pitch;
	}
}

} // End of namespace Scumm