scummvm/backends/platform/android/touchcontrols.cpp

/* 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/>.
 *
 */

// Allow use of stuff in <time.h>
#define FORBIDDEN_SYMBOL_EXCEPTION_time_h

//
// Disable printf override in common/forbidden.h to avoid
// clashes with log.h from the Android SDK.
// That header file uses
//   __attribute__ ((format(printf, 3, 4)))
// which gets messed up by our override mechanism; this could
// be avoided by either changing the Android SDK to use the equally
// legal and valid
//   __attribute__ ((format(__printf__, 3, 4)))
// or by refining our printf override to use a varadic macro
// (which then wouldn't be portable, though).
// Anyway, for now we just disable the printf override globally
// for the Android port
#define FORBIDDEN_SYMBOL_EXCEPTION_printf

#include "backends/platform/android/android.h"
#include "backends/platform/android/jni-android.h"
#include "backends/platform/android/touchcontrols.h"

#include "common/file.h"
#include "graphics/svg.h"

#define SVG_WIDTH          384
#define SVG_HEIGHT         256
#define BG_WIDTH           128
#define BG_HEIGHT          128
#define ARROW_DEAD          21
#define ARROW_SUPER         42
#define ARROW_END           64
#define ARROW_WIDTH         64
#define ARROW_SEMI_HEIGHT   52
#define ARROW_HEIGHT        64
#define ARROW_HL_LEFT        0
#define ARROW_HL_TOP       128
#define BUTTON_DEAD         12
#define BUTTON_END          64
#define BUTTON_WIDTH        64
#define BUTTON_HEIGHT       64
#define BUTTON_HL_LEFT     128
#define BUTTON_HL_TOP      128
#define BUTTON2_HL_LEFT    256
#define BUTTON2_HL_TOP     128

#define ALPHA_OPAQUE       255
#define ZOMBIE_TIMEOUT     500 // ms

// The scale factor is stored as a fixed point 30.2 bits
// This avoids floating point operations
#define SCALE_FACTOR_FXP 4

// gamepad.svg was designed with a basis of 128x128 sized widget
// As it's too small on screen, we apply a factor of 1.5x
// It can be tuned here and in SVG viewBox without changing anything else
#define SVG_UNSCALED(x) ((x) * 3 / 2)
#define SVG_SQ_UNSCALED(x) ((x * x) * 9 / 4)

#define SVG_SCALED(x) (SVG_UNSCALED(x) * _scale)
#define SCALED_PIXELS(x) ((x) / SCALE_FACTOR_FXP)

#define SVG_PIXELS(x) SCALED_PIXELS(SVG_SCALED(x))

#define FUNC_SVG_SQ_SCALED(x) (SVG_SQ_UNSCALED(x) * parent->_scale2)

TouchControls::TouchControls() :
	_drawer(nullptr),
	_screen_width(0),
	_screen_height(0),
	_svg(nullptr),
	_zombieCount(0),
	_scale(0),
	_scale2(0) {
	_functions[kFunctionLeft]   = new FunctionLeft(this);
	_functions[kFunctionRight]  = new FunctionRight(this);
	_functions[kFunctionCenter] = new FunctionCenter(this);
}

void TouchControls::init(float scale) {
	_scale = scale * SCALE_FACTOR_FXP;
	// As scale is small, this should fit in int
	_scale2 = _scale * _scale;

	Common::File stream;

	if (!stream.open("gamepad.svg")) {
		error("Failed to fetch gamepad image");
	}

	delete _svg;
	_svg = new Graphics::SVGBitmap(&stream, SVG_PIXELS(SVG_WIDTH), SVG_PIXELS(SVG_HEIGHT));
}

TouchControls::~TouchControls() {
	delete _svg;
	for(unsigned int i = 0; i < kFunctionCount; i++) {
		delete _functions[i];
	}
}

void TouchControls::beforeDraw() {
	if (!_zombieCount) {
		return;
	}
	// We have zombies, force redraw to render fading out
	if (_drawer) {
		_drawer->touchControlNotifyChanged();
	}

	// Check for zombie functions, clear them out if expired
	unsigned int zombieCount = 0;
	uint32 now = g_system->getMillis(true);
	for (uint i = 0; i < kFunctionCount; i++) {
		Function *func = _functions[i];
		if (func->status != kFunctionZombie) {
			continue;
		}
		if (func->lastActivable < now) {
			func->status = kFunctionInactive;
			continue;
		}
		zombieCount++;
	}
	_zombieCount = zombieCount;
}

TouchControls::FunctionId TouchControls::getFunctionId(int x, int y) {
	if (_screen_width == 0) {
		// Avoid divide by 0 error
		return kFunctionNone;
	}

	// Exclude areas reserved for system
	if ((x < JNI::gestures_insets[0] * SCALE_FACTOR_FXP) ||
		(y < JNI::gestures_insets[1] * SCALE_FACTOR_FXP) ||
		(x >= _screen_width - JNI::gestures_insets[2] * SCALE_FACTOR_FXP) ||
		(y >= _screen_height - JNI::gestures_insets[3] * SCALE_FACTOR_FXP)) {
		return kFunctionNone;
	}

	float xRatio = float(x) / _screen_width;

	if (xRatio < 0.3) {
		return kFunctionLeft;
	} else if (xRatio < 0.7) {
		return kFunctionCenter;
	} else {
		return kFunctionRight;
	}
}

void TouchControls::setDrawer(TouchControlsDrawer *drawer, int width, int height) {
	_drawer = drawer;
	_screen_width = width * SCALE_FACTOR_FXP;
	_screen_height = height * SCALE_FACTOR_FXP;

	if (drawer) {
		drawer->touchControlInitSurface(*_svg);
	}
}

TouchControls::Function *TouchControls::getFunctionFromPointerId(int ptrId) {
	for (uint i = 0; i < kFunctionCount; i++) {
		Function *func = _functions[i];
		if (func->status != kFunctionActive) {
			continue;
		}
		if (func->pointerId == ptrId) {
			return func;
		}
	}
	return nullptr;
}

TouchControls::Function *TouchControls::getZombieFunctionFromPos(int x, int y) {
	if (!_zombieCount) {
		return nullptr;
	}
	for (uint i = 0; i < kFunctionCount; i++) {
		Function *func = _functions[i];
		if (func->status != kFunctionZombie) {
			// Already assigned to a finger or dead
			continue;
		}
		if (func->isInside(x, y)) {
			return func;
		}
	}
	return nullptr;
}

void TouchControls::draw() {
	assert(_drawer != nullptr);

	uint32 now = g_system->getMillis(true);

	for (uint i = 0; i < kFunctionCount; i++) {
		Function *func = _functions[i];
		uint8 alpha;
		switch (func->status) {
		case kFunctionActive:
			alpha = ALPHA_OPAQUE;
			break;
		case kFunctionZombie:
			if (func->lastActivable < now) {
				// This function is definitely dead
				continue;
			}
			alpha = (func->lastActivable - now) * ALPHA_OPAQUE / ZOMBIE_TIMEOUT;
			break;
		case kFunctionInactive:
		default:
			continue;
		}
		func->draw(alpha);
	}
}

void TouchControls::update(Action action, int ptrId, int x, int y) {
	x *= SCALE_FACTOR_FXP;
	y *= SCALE_FACTOR_FXP;
	if (action == JACTION_DOWN) {
		Function *func = getZombieFunctionFromPos(x, y);
		if (!func) {
			// Finger was not pressed on a zombie function
			// Determine which function it could be
			FunctionId funcId = getFunctionId(x, y);
			if (funcId != kFunctionNone) {
				func = _functions[funcId];
			}
			if (!func) {
				// No function for this finger
				return;
			}
			if (func->status == kFunctionActive) {
				// Another finger is already on this function
				return;
			}

			// When zombie, we reuse the old start coordinates
			// but not when starting over
			func->reset();
			func->startX = x;
			func->startY = y;
		}


		func->status = kFunctionActive;
		func->pointerId = ptrId;
		func->currentX = x;
		func->currentY = y;

		int dX = x - func->startX;
		int dY = y - func->startY;

		func->touch(dX, dY, action);
		if (_drawer) {
			_drawer->touchControlNotifyChanged();
		}
	} else if (action == JACTION_MOVE) {
		Function *func = getFunctionFromPointerId(ptrId);
		if (!func) {
			return;
		}

		func->currentX = x;
		func->currentY = y;

		int dX = x - func->startX;
		int dY = y - func->startY;

		func->touch(dX, dY, action);
		if (_drawer) {
			_drawer->touchControlNotifyChanged();
		}
	} else if (action == JACTION_UP) {
		Function *func = getFunctionFromPointerId(ptrId);
		if (!func) {
			return;
		}

		func->currentX = x;
		func->currentY = y;

		int dX = x - func->startX;
		int dY = y - func->startY;

		func->touch(dX, dY, action);
		func->status = kFunctionZombie;
		func->lastActivable = g_system->getMillis(true) + ZOMBIE_TIMEOUT;
		if (_drawer) {
			_drawer->touchControlNotifyChanged();
		}
		_zombieCount++;
	} else if (action == JACTION_CANCEL) {
		for (uint i = 0; i < kFunctionCount; i++) {
			Function *func = _functions[i];

			if (func->status == kFunctionActive) {
				func->touch(0, 0, action);
			}
			func->reset();
		}
		if (_drawer) {
			_drawer->touchControlNotifyChanged();
		}
		_zombieCount = 0;
	}
}

void TouchControls::buttonDown(Common::JoystickButton jb) {
	if (jb == Common::JOYSTICK_BUTTON_INVALID) {
		return;
	}

	//LOGD("TouchControls::buttonDown: %d", jb);
	Common::Event ev;
	ev.type = Common::EVENT_JOYBUTTON_DOWN;
	ev.joystick.button = jb;
	dynamic_cast<OSystem_Android *>(g_system)->pushEvent(ev);
}

void TouchControls::buttonUp(Common::JoystickButton jb) {
	if (jb == Common::JOYSTICK_BUTTON_INVALID) {
		return;
	}

	//LOGD("TouchControls::buttonUp: %d", jb);
	Common::Event ev;
	ev.type = Common::EVENT_JOYBUTTON_UP;
	ev.joystick.button = jb;
	dynamic_cast<OSystem_Android *>(g_system)->pushEvent(ev);
}

void TouchControls::buttonPress(Common::JoystickButton jb) {
	if (jb == Common::JOYSTICK_BUTTON_INVALID) {
		return;
	}

	//LOGD("TouchControls::buttonPress: %d", jb);
	Common::Event ev1, ev2;
	ev1.type = Common::EVENT_JOYBUTTON_DOWN;
	ev1.joystick.button = jb;
	ev2.type = Common::EVENT_JOYBUTTON_UP;
	ev2.joystick.button = jb;
	dynamic_cast<OSystem_Android *>(g_system)->pushEvent(ev1, ev2);
}

void TouchControls::drawSurface(uint8 alpha, int x, int y, int offX, int offY, const Common::Rect &clip) const {
	Common::Rect clip_(SVG_PIXELS(clip.left), SVG_PIXELS(clip.top),
			SVG_PIXELS(clip.right), SVG_PIXELS(clip.bottom));
	_drawer->touchControlDraw(alpha,
			SCALED_PIXELS(x + SVG_SCALED(offX)), SCALED_PIXELS(y + SVG_SCALED(offY)),
			clip_.width(), clip_.height(), clip_);
}

bool TouchControls::FunctionLeft::isInside(int x, int y) {
	int dX = x - startX;
	int dY = y - startY;
	// norm 2 squared (to avoid square root)
	unsigned int sqNorm = (unsigned int)(dX * dX) + (unsigned int)(dY * dY);

	if (sqNorm <= FUNC_SVG_SQ_SCALED(ARROW_END)) {
		return true;
	}

	// Also accept touches near the old last touch
	dX = x - currentX;
	dY = y - currentY;
	sqNorm = (unsigned int)(dX * dX) + (unsigned int)(dY * dY);

	if (sqNorm <= FUNC_SVG_SQ_SCALED(ARROW_DEAD)) {
		return true;
	}

	return false;
}

void TouchControls::FunctionLeft::maskToLeftButtons(uint32 oldMask, uint32 newMask) {
	static const Common::JoystickButton buttons[] = {
		Common::JOYSTICK_BUTTON_DPAD_UP, Common::JOYSTICK_BUTTON_DPAD_RIGHT,
		Common::JOYSTICK_BUTTON_DPAD_DOWN, Common::JOYSTICK_BUTTON_DPAD_LEFT
	};

	uint32 diff = newMask ^ oldMask;

	for(int i = 0, m = 1; i < ARRAYSIZE(buttons); i++, m <<= 1) {
		if (!(diff & m)) {
			continue;
		}
		if (oldMask & m) {
			TouchControls::buttonUp(buttons[i]);
		}
	}
	if (diff & 16) {
		if (oldMask & 16) {
			TouchControls::buttonUp(Common::JOYSTICK_BUTTON_RIGHT_SHOULDER);
		} else {
			TouchControls::buttonDown(Common::JOYSTICK_BUTTON_RIGHT_SHOULDER);
		}
	}
	for(int i = 0, m = 1; i < ARRAYSIZE(buttons); i++, m <<= 1) {
		if (!(diff & m)) {
			continue;
		}
		if (newMask & m) {
			TouchControls::buttonDown(buttons[i]);
		}
	}
}

void TouchControls::FunctionLeft::touch(int dX, int dY, Action action) {
	if (action == JACTION_CANCEL ||
		action == JACTION_UP) {
		maskToLeftButtons(mask, 0);
		resetState();
		return;
	}

	uint32 newMask = 0;

	// norm 2 squared (to avoid square root)
	unsigned int sqNorm = (unsigned int)(dX * dX) + (unsigned int)(dY * dY);

	if (sqNorm >= FUNC_SVG_SQ_SCALED(ARROW_DEAD)) {
		// We are far enough from the center
		// For right we use angles -60,60 as a sensitive zone
		// For left it's the same but mirrored in negative
		// We must be between the two lines which are of tan(60),tan(-60) and this corrsponds to sqrt(3)
		// For up down we use angles -30,30  as a sensitive zone
		// We must be outside the two lines which are of tan(30),tan(-30) and this corrsponds to 1/sqrt(3)
		/*
		static const double SQRT3 = 1.73205080756887719318;
		unsigned int sq3 = SQRT3 * abs(dX);
		*/
		// Optimize by using an approximation of sqrt(3)
		unsigned int sq3 = abs(dX) * 51409 / 29681;
		unsigned int isq3 = abs(dX) * 29681 / 51409;

		unsigned int adY = abs(dY);

		if (adY <= sq3) {
			// Left or right
			if (dX < 0) {
				newMask |= 8;
			} else {
				newMask |= 2;
			}
		}
		if (adY >= isq3) {
			// Up or down
			if (dY < 0) {
				newMask |= 1;
			} else {
				newMask |= 4;
			}

		}
	}

	if (sqNorm > FUNC_SVG_SQ_SCALED(ARROW_SUPER)) {
		newMask |= 16;
	}

	if (mask != newMask) {
		maskToLeftButtons(mask, newMask);
	}

	mask = newMask;
}

void TouchControls::FunctionLeft::draw(uint8 alpha) {
	// Draw background
	{
		Common::Rect clip(0, 0, BG_WIDTH, BG_HEIGHT);
		parent->drawSurface(alpha, startX, startY, -clip.width() / 2, -clip.height() / 2, clip);
	}

	if (mask == 0) {
		return;
	}


	// Width and height here are rotated for left/right
	uint16 width = ARROW_WIDTH;
	uint16 height;
	if (mask & 16) {
		height = ARROW_HEIGHT;
	} else {
		height = ARROW_SEMI_HEIGHT;
	}

	// We can draw multiple arrows
	if (mask & 1) {
		// Draw UP
		Common::Rect clip(width, height);
		clip.translate(0, ARROW_HL_TOP + ARROW_HEIGHT - height);
		int16 offX = -1, offY = -2;
		parent->drawSurface(ALPHA_OPAQUE, startX, startY, offX * clip.width() / 2, offY * clip.height() / 2, clip);
	}
	if (mask & 2) {
		// Draw RIGHT
		Common::Rect clip(height, width);
		clip.translate(ARROW_WIDTH, ARROW_HL_TOP);
		int16 offX = 0, offY = -1;
		parent->drawSurface(ALPHA_OPAQUE, startX, startY, offX * clip.width() / 2, offY * clip.height() / 2, clip);
	}
	if (mask & 4) {
		// Draw DOWN
		Common::Rect clip(width, height);
		clip.translate(0, ARROW_HL_TOP + ARROW_HEIGHT);
		int16 offX = -1, offY = 0;
		parent->drawSurface(ALPHA_OPAQUE, startX, startY, offX * clip.width() / 2, offY * clip.height() / 2, clip);
	}
	if (mask & 8) {
		// Draw LEFT
		Common::Rect clip(height, width);
		clip.translate(ARROW_WIDTH + ARROW_WIDTH - height, ARROW_HL_TOP + ARROW_HEIGHT);
		int16 offX = -2, offY = -1;
		parent->drawSurface(ALPHA_OPAQUE, startX, startY, offX * clip.width() / 2, offY * clip.height() / 2, clip);
	}
}

bool TouchControls::FunctionRight::isInside(int x, int y) {
	int dX = x - startX;
	int dY = y - startY;
	// norm 2 squared (to avoid square root)
	unsigned int sqNorm = (unsigned int)(dX * dX) + (unsigned int)(dY * dY);

	return sqNorm <= FUNC_SVG_SQ_SCALED(BUTTON_END);
}

void TouchControls::FunctionRight::touch(int dX, int dY, Action action) {
	static const Common::JoystickButton buttons[] = {
		Common::JOYSTICK_BUTTON_Y, Common::JOYSTICK_BUTTON_B,
		Common::JOYSTICK_BUTTON_A, Common::JOYSTICK_BUTTON_X
	};
	static const Common::JoystickButton modifiers[] = {
		Common::JOYSTICK_BUTTON_INVALID, Common::JOYSTICK_BUTTON_INVALID,
		Common::JOYSTICK_BUTTON_INVALID, Common::JOYSTICK_BUTTON_INVALID
	};
	if (action == JACTION_CANCEL ||
		action == JACTION_UP) {
		if (button) {
			buttonUp(buttons[button - 1]);
			buttonUp(modifiers[button - 1]);
		}
		resetState();
		return;
	}

	uint32 newButton = 0;

	// norm 2 squared (to avoid square root)
	unsigned int sqNorm = (unsigned int)(dX * dX) + (unsigned int)(dY * dY);

	if (sqNorm >= FUNC_SVG_SQ_SCALED(BUTTON_DEAD) && sqNorm <= FUNC_SVG_SQ_SCALED(BUTTON_END)) {
		// We are far enough from the center
		// For right we use angles -45,45 as a sensitive zone
		// For left it's the same but mirrored in negative
		// We must be between the two lines which are of tan(45),tan(-45) and this corrsponds to 1
		// For up down we use angles -45,45  as a sensitive zone
		// We must be outside the two lines which are of tan(45),tan(-45) and this corrsponds to 1
		unsigned int adX = abs(dX);
		unsigned int adY = abs(dY);

		if (adY <= adX) {
			// X or B
			if (dX < 0) {
				newButton = 4;
			} else {
				newButton = 2;
			}
		} else {
			// Y or A
			if (dY < 0) {
				newButton = 1;
			} else {
				newButton = 3;
			}

		}
	} else {
		newButton = 0;
	}

	if (button != newButton) {
		// Release the previously pressed button, if any
		if (button) {
			buttonUp(buttons[button - 1]);
			buttonUp(modifiers[button - 1]);
		}
		button = newButton;
		// Press the new button
		if (button) {
			buttonDown(modifiers[button - 1]);
			buttonDown(buttons[button - 1]);
		}
	}
}

void TouchControls::FunctionRight::draw(uint8 alpha) {
	// Draw background
	{
		Common::Rect clip(BG_WIDTH, 0, 2 * BG_WIDTH, BG_HEIGHT);
		parent->drawSurface(alpha, startX, startY, -clip.width() / 2, -clip.height() / 2, clip);
	}

	if (button == 0) {
		return;
	}


	Common::Rect clip(BUTTON_WIDTH, BUTTON_HEIGHT);

	int16 offX, offY;

	if (button == 1) {
		// Draw Y
		clip.translate(BUTTON_HL_LEFT, BUTTON_HL_TOP);
		offX = -1;
		offY = -2;
	} else if (button == 2) {
		// Draw B
		clip.translate(BUTTON_HL_LEFT + BUTTON_WIDTH, BUTTON_HL_TOP);
		offX = 0;
		offY = -1;
	} else if (button == 3) {
		// Draw A
		clip.translate(BUTTON_HL_LEFT, BUTTON_HL_TOP + BUTTON_HEIGHT);
		offX = -1;
		offY = 0;
	} else if (button == 4) {
		// Draw X
		clip.translate(BUTTON_HL_LEFT + BUTTON_WIDTH, BUTTON_HL_TOP + BUTTON_HEIGHT);
		offX = -2;
		offY = -1;
	} else {
		return;
	}
	parent->drawSurface(ALPHA_OPAQUE, startX, startY, offX * clip.width() / 2, offY * clip.height() / 2, clip);
}

bool TouchControls::FunctionCenter::isInside(int x, int y) {
	int dX = x - startX;
	int dY = y - startY;
	// norm 2 squared (to avoid square root)
	unsigned int sqNorm = (unsigned int)(dX * dX) + (unsigned int)(dY * dY);

	return sqNorm <= FUNC_SVG_SQ_SCALED(BUTTON_END);
}

void TouchControls::FunctionCenter::touch(int dX, int dY, Action action) {
	static const Common::JoystickButton buttons[] = {
		Common::JOYSTICK_BUTTON_GUIDE, Common::JOYSTICK_BUTTON_RIGHT_STICK,
		Common::JOYSTICK_BUTTON_START, Common::JOYSTICK_BUTTON_LEFT_STICK
	};
	static const Common::JoystickButton modifiers[] = {
		Common::JOYSTICK_BUTTON_INVALID, Common::JOYSTICK_BUTTON_INVALID,
		Common::JOYSTICK_BUTTON_INVALID, Common::JOYSTICK_BUTTON_INVALID
	};
	if (action == JACTION_CANCEL ||
		action == JACTION_UP) {
		if (button) {
			buttonUp(buttons[button - 1]);
			buttonUp(modifiers[button - 1]);
		}
		resetState();
		return;
	}

	uint32 newButton = 0;

	// norm 2 squared (to avoid square root)
	unsigned int sqNorm = (unsigned int)(dX * dX) + (unsigned int)(dY * dY);

	if (sqNorm >= FUNC_SVG_SQ_SCALED(BUTTON_DEAD) && sqNorm <= FUNC_SVG_SQ_SCALED(BUTTON_END)) {
		// We are far enough from the center
		// For right we use angles -45,45 as a sensitive zone
		// For left it's the same but mirrored in negative
		// We must be between the two lines which are of tan(45),tan(-45) and this corrsponds to 1
		// For up down we use angles -45,45  as a sensitive zone
		// We must be outside the two lines which are of tan(45),tan(-45) and this corrsponds to 1
		unsigned int adX = abs(dX);
		unsigned int adY = abs(dY);

		if (adY <= adX) {
			// X or B
			if (dX < 0) {
				newButton = 4;
			} else {
				newButton = 2;
			}
		} else {
			// Y or A
			if (dY < 0) {
				newButton = 1;
			} else {
				newButton = 3;
			}

		}
	} else {
		newButton = 0;
	}

	if (button != newButton) {
		// Release the previously pressed button, if any
		if (button) {
			buttonUp(buttons[button - 1]);
			buttonUp(modifiers[button - 1]);
		}
		button = newButton;
		// Press the new button
		if (button) {
			buttonDown(modifiers[button - 1]);
			buttonDown(buttons[button - 1]);
		}
	}
}

void TouchControls::FunctionCenter::draw(uint8 alpha) {
	// Draw background
	{
		Common::Rect clip(BG_WIDTH * 2, 0, 3 * BG_WIDTH, BG_HEIGHT);
		parent->drawSurface(alpha, startX, startY, -clip.width() / 2, -clip.height() / 2, clip);
	}

	if (button == 0) {
		return;
	}

	Common::Rect clip(BUTTON_WIDTH, BUTTON_HEIGHT);

	int16 offX, offY;

	if (button == 1) {
		// Draw Y
		clip.translate(BUTTON2_HL_LEFT, BUTTON2_HL_TOP);
		offX = -1;
		offY = -2;
	} else if (button == 2) {
		// Draw B
		clip.translate(BUTTON2_HL_LEFT + BUTTON_WIDTH, BUTTON2_HL_TOP);
		offX = 0;
		offY = -1;
	} else if (button == 3) {
		// Draw A
		clip.translate(BUTTON2_HL_LEFT, BUTTON2_HL_TOP + BUTTON_HEIGHT);
		offX = -1;
		offY = 0;
	} else if (button == 4) {
		// Draw X
		clip.translate(BUTTON2_HL_LEFT + BUTTON_WIDTH, BUTTON2_HL_TOP + BUTTON_HEIGHT);
		offX = -2;
		offY = -1;
	} else {
		return;
	}
	// Always draw overlay as opaque
	parent->drawSurface(ALPHA_OPAQUE, startX, startY, offX * clip.width() / 2, offY * clip.height() / 2, clip);
}