STARTREK: Split up startrek.cpp into more files

1 files changed, 1421 insertions, 0 deletions

diff --git a/engines/startrek/actors.cpp b/engines/startrek/actors.cpp
new file mode 100644
index 0000000000..04c2a175c4
--- /dev/null
+++ b/engines/startrek/actors.cpp
@@ -0,0 +1,1421 @@
+/* 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 2
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include "startrek/iwfile.h"
+#include "startrek/room.h"
+#include "startrek/startrek.h"
+
+namespace StarTrek {
+
+void StarTrekEngine::initActors() {
+	for (int i = 0; i < NUM_ACTORS; i++)
+		_actorList[i] = Actor();
+	for (int i = 0; i < MAX_BAN_FILES; i++)
+		_banFiles[i].reset();
+
+	strcpy(_kirkActor->animationString, "kstnd");
+	strcpy(_spockActor->animationString, "sstnd");
+	strcpy(_mccoyActor->animationString, "mstnd");
+	strcpy(_redshirtActor->animationString, "rstnd");
+}
+
+int StarTrekEngine::loadActorAnim(int actorIndex, const Common::String &animName, int16 x, int16 y, Fixed8 scale) {
+	debugC(6, kDebugGraphics, "Load animation '%s' on actor %d", animName.c_str(), actorIndex);
+
+	Actor *actor;
+
+	if (actorIndex == -1) {
+		// TODO
+		warning("loadActorAnim: actor == -1");
+	} else
+		actor = &_actorList[actorIndex];
+
+	if (actor->spriteDrawn) {
+		releaseAnim(actor);
+		drawActorToScreen(actor, animName, x, y, scale, false);
+	} else {
+		drawActorToScreen(actor, animName, x, y, scale, true);
+	}
+
+	actor->triggerActionWhenAnimFinished = false;
+	actor->finishedAnimActionParam = 0;
+
+	return actorIndex;
+}
+
+void StarTrekEngine::loadBanFile(const Common::String &name) {
+	debugC(kDebugGeneral, 7, "Load BAN file: %s.ban", name.c_str());
+	for (int i = 0; i < MAX_BAN_FILES; i++) {
+		if (!_banFiles[i]) {
+			_banFiles[i] = loadFile(name + ".ban");
+			_banFileOffsets[i] = 0;
+			return;
+		}
+	}
+
+	warning("Couldn't load .BAN file \"%s.ban\"", name.c_str());
+}
+
+bool StarTrekEngine::actorWalkToPosition(int actorIndex, const Common::String &animFile, int16 srcX, int16 srcY, int16 destX, int16 destY) {
+	debugC(6, "Obj %d: walk from (%d,%d) to (%d,%d)", actorIndex, srcX, srcY, destX, destY);
+
+	Actor *actor = &_actorList[actorIndex];
+
+	actor->triggerActionWhenAnimFinished = false;
+	if (isPositionSolid(destX, destY))
+		return false;
+
+	if (actor->spriteDrawn)
+		releaseAnim(actor);
+	else
+		_gfx->addSprite(&actor->sprite);
+
+	actor->spriteDrawn = true;
+	actor->animType = 1;
+	actor->frameToStartNextAnim = _frameIndex + 1;
+	strcpy(actor->animationString2, animFile.c_str());
+
+	actor->dest.x = destX;
+	actor->dest.y = destY;
+	actor->field92 = 0;
+	actor->triggerActionWhenAnimFinished = false;
+
+	actor->iwDestPosition = -1;
+	actor->iwSrcPosition = -1;
+
+	if (directPathExists(srcX, srcY, destX, destY)) {
+		chooseActorDirectionForWalking(actor, srcX, srcY, destX, destY);
+		updateActorPositionWhileWalking(actor, (actor->granularPosX + 0.5).toInt(), (actor->granularPosY + 0.5).toInt());
+		return true;
+	} else {
+		actor->iwSrcPosition = _iwFile->getClosestKeyPosition(srcX, srcY);
+		actor->iwDestPosition = _iwFile->getClosestKeyPosition(destX, destY);
+
+		if (actor->iwSrcPosition == -1 || actor->iwDestPosition == -1) {
+			// No path exists; face south by default.
+			strcat(actor->animationString2, "S");
+			actor->direction = 'S';
+
+			updateActorPositionWhileWalking(actor, srcX, srcY);
+			initStandAnim(actorIndex);
+
+			return false;
+		} else {
+			Common::Point iwSrc = _iwFile->_keyPositions[actor->iwSrcPosition];
+			chooseActorDirectionForWalking(actor, srcX, srcY, iwSrc.x, iwSrc.y);
+			updateActorPositionWhileWalking(actor, (actor->granularPosX + 0.5).toInt(), (actor->granularPosY + 0.5).toInt());
+			return true;
+		}
+	}
+}
+
+void StarTrekEngine::updateActorAnimations() {
+	for (int i = 0; i < NUM_ACTORS; i++) {
+		Actor *actor = &_actorList[i];
+		if (!actor->spriteDrawn)
+			continue;
+
+		switch (actor->animType) {
+		case 0: // Not walking?
+		case 2:
+			if (_frameIndex >= actor->frameToStartNextAnim) {
+				int nextAnimIndex = getRandomWord() & 3;
+				actor->animFile->seek(18 + nextAnimIndex + actor->animFrame * 22, SEEK_SET);
+				byte nextAnimFrame = actor->animFile->readByte();
+
+				if (actor->animFrame != nextAnimFrame) {
+					if (nextAnimFrame == actor->numAnimFrames - 1) {
+						actor->field62++;
+						if (actor->triggerActionWhenAnimFinished) {
+							addAction(ACTION_FINISHED_ANIMATION, actor->finishedAnimActionParam, 0, 0);
+						}
+					}
+				}
+
+				actor->animFrame = nextAnimFrame;
+				if (actor->animFrame >= actor->numAnimFrames) {
+					if (actor->animationString[0] == '\0')
+						removeActorFromScreen(i);
+					else
+						initStandAnim(i);
+				} else {
+					Sprite *sprite = &actor->sprite;
+
+					actor->animFile->seek(actor->animFrame * 22, SEEK_SET);
+					char animFrameFilename[16];
+					actor->animFile->read(animFrameFilename, 16);
+					sprite->setBitmap(loadAnimationFrame(animFrameFilename, actor->scale));
+
+					memset(actor->bitmapFilename, 0, 10);
+					strncpy(actor->bitmapFilename, animFrameFilename, 9);
+
+					actor->animFile->seek(10 + actor->animFrame * 22, SEEK_SET);
+					uint16 xOffset = actor->animFile->readUint16();
+					uint16 yOffset = actor->animFile->readUint16();
+					uint16 basePriority = actor->animFile->readUint16();
+					uint16 frames = actor->animFile->readUint16();
+
+					sprite->pos.x = xOffset + actor->pos.x;
+					sprite->pos.y = yOffset + actor->pos.y;
+					sprite->drawPriority = _gfx->getPriValue(0, yOffset + actor->pos.y) + basePriority;
+					sprite->bitmapChanged = true;
+
+					actor->frameToStartNextAnim = frames + _frameIndex;
+				}
+			}
+			break;
+		case 1: // Walking
+			if (_frameIndex < actor->frameToStartNextAnim)
+				break;
+			if (i == 0) // Kirk only
+				checkTouchedLoadingZone(actor->pos.x, actor->pos.y);
+			if (actor->field90 != 0) {
+				Sprite *sprite = &actor->sprite;
+				int loops;
+				if (getActorScaleAtPosition((actor->granularPosY + 0.5).toInt()) < 0.625)
+					loops = 1;
+				else
+					loops = 2;
+				for (int k = 0; k < loops; k++) {
+					if (actor->field90 == 0)
+						break;
+					actor->field90--;
+					Fixed16 newX = actor->granularPosX + actor->speedX;
+					Fixed16 newY = actor->granularPosY + actor->speedY;
+					if ((actor->field90 & 3) == 0) {
+						sprite->bitmap.reset();
+						updateActorPositionWhileWalking(actor, (newX + 0.5).toInt(), (newY + 0.5).toInt());
+						actor->field92++;
+					}
+
+					actor->granularPosX = newX;
+					actor->granularPosY = newY;
+					actor->frameToStartNextAnim = _frameIndex;
+				}
+			} else { // actor->field90 == 0
+				if (actor->iwSrcPosition == -1) {
+					if (actor->triggerActionWhenAnimFinished) {
+						actor->triggerActionWhenAnimFinished = false;
+						addAction(ACTION_FINISHED_WALKING, actor->finishedAnimActionParam & 0xff, 0, 0);
+					}
+
+					actor->sprite.bitmap.reset();
+					updateActorPositionWhileWalking(actor, (actor->granularPosX + 0.5).toInt(), (actor->granularPosY + 0.5).toInt());
+					initStandAnim(i);
+				} else { // actor->iwSrcPosition != -1
+					if (actor->iwSrcPosition == actor->iwDestPosition) {
+						actor->animationString2[strlen(actor->animationString2) - 1] = '\0';
+						actor->iwDestPosition = -1;
+						actor->iwSrcPosition = -1;
+						chooseActorDirectionForWalking(actor, actor->pos.x, actor->pos.y, actor->dest.x, actor->dest.y);
+					} else {
+						int index = _iwFile->_iwEntries[actor->iwSrcPosition][actor->iwDestPosition];
+						actor->iwSrcPosition = index;
+						Common::Point dest = _iwFile->_keyPositions[actor->iwSrcPosition];
+						actor->animationString2[strlen(actor->animationString2) - 1] = '\0';
+						chooseActorDirectionForWalking(actor, actor->pos.x, actor->pos.y, dest.x, dest.y);
+					}
+				}
+			}
+			break;
+		default:
+			error("Invalid anim type.");
+			break;
+		}
+	}
+}
+
+void StarTrekEngine::renderBanBelowSprites() {
+	if ((_frameIndex & 3) != 0)
+		return;
+
+	byte *screenPixels = _gfx->lockScreenPixels();
+	byte *bgPixels = _gfx->getBackgroundPixels();
+
+	for (int i = 0; i < MAX_BAN_FILES; i++) {
+		if (!_banFiles[i])
+			continue;
+
+		// TODO: video modes other than VGA
+
+		_banFiles[i]->seek(_banFileOffsets[i], SEEK_SET);
+		uint16 offset = _banFiles[i]->readUint16();
+
+		if (offset == 0xffff) {
+			_banFileOffsets[i] = 0;
+			_banFiles[i]->seek(0, SEEK_SET);
+			offset = _banFiles[i]->readSint16();
+		}
+
+		int16 size = _banFiles[i]->readSint16();
+		if (size != 0) {
+			_banFiles[i]->seek(_banFileOffsets[i], SEEK_SET);
+			renderBan(screenPixels, _banFiles[i]);
+
+			_banFiles[i]->seek(_banFileOffsets[i], SEEK_SET);
+			renderBan(bgPixels, _banFiles[i]);
+		}
+
+	}
+
+	_gfx->unlockScreenPixels();
+}
+
+void StarTrekEngine::renderBan(byte *destPixels, SharedPtr<FileStream> banFile) {
+	uint16 offset = banFile->readUint16();
+	int32 size = banFile->readUint16();
+
+	byte *dest = destPixels + offset;
+
+	// Skip 8 bytes (rectangle encompassing the area being drawn to)
+	banFile->readSint32();
+	banFile->readSint32();
+
+	while (--size >= 0) {
+		assert(dest >= destPixels && dest < destPixels + SCREEN_WIDTH * SCREEN_HEIGHT);
+		int8 b = banFile->readByte();
+
+		if (b == -128) // Add value to destination (usually jumping to next row)
+			dest += banFile->readUint16();
+		else if (b < 0) { // Repeated byte
+			byte c = banFile->readByte();
+			if (c == 0)
+				dest += (-b) + 1;
+			else {
+				for (int j = 0; j < (-b) + 1; j++)
+					(*dest++) = c;
+			}
+		} else { // List of bytes
+			b++;
+			while (b-- != 0) {
+				byte c = banFile->readByte();
+				if (c == 0)
+					dest++;
+				else
+					*(dest++) = c;
+			}
+		}
+	}
+}
+
+void StarTrekEngine::renderBanAboveSprites() {
+	if ((_frameIndex & 3) != 0)
+		return;
+
+	for (int i = 0; i < MAX_BAN_FILES; i++) {
+		if (!_banFiles[i])
+			continue;
+
+		_banFiles[i]->seek(_banFileOffsets[i], SEEK_SET);
+		uint16 offset = _banFiles[i]->readUint16();
+
+		if (offset == 0xffff) {
+			_banFileOffsets[i] = 0;
+			_banFiles[i]->seek(0, SEEK_SET);
+			offset = _banFiles[i]->readSint16();
+		}
+
+		int16 size = _banFiles[i]->readSint16();
+		if (size != 0) {
+			Common::Rect rect;
+			rect.left   = _banFiles[i]->readSint16();
+			rect.top    = _banFiles[i]->readSint16();
+			rect.right  = _banFiles[i]->readSint16() + 1;
+			rect.bottom = _banFiles[i]->readSint16() + 1;
+
+			// Draw all sprites in this rectangle to a custom surface, and only update the
+			// specific pixels that were updated by the BAN file this frame.
+			// Rationale behind this is that, since the background may not have been
+			// redrawn, the transparent sprites (ie. textboxes) would further darken any
+			// pixels behind them that haven't been updated this frame. So, we can't just
+			// update everything in this rectangle.
+			// FIXME: This copies the entire screen surface for temporary drawing, which
+			// is somewhat wasteful. Original game had one more graphics layer it drew to
+			// before the screen was updated...
+			::Graphics::Surface surface;
+			_gfx->drawAllSpritesInRectToSurface(rect, &surface);
+
+			byte *destPixels = _gfx->lockScreenPixels();
+			byte *src = (byte *)surface.getPixels() + offset;
+			byte *dest = destPixels + offset;
+
+			// This is similar to renderBan(), except it copies pixels from the surface
+			// above instead of drawing directly to it. (Important since sprites may be
+			// drawn on top.)
+			while (--size >= 0) {
+				assert(dest >= destPixels && dest < destPixels + SCREEN_WIDTH * SCREEN_HEIGHT);
+				int8 b = _banFiles[i]->readByte();
+				if (b == -128) {
+					uint16 skip = _banFiles[i]->readUint16();
+					dest += skip;
+					src  += skip;
+				} else if (b < 0) {
+					byte c = _banFiles[i]->readByte();
+					if (c == 0) {
+						dest += (-b) + 1;
+						src  += (-b) + 1;
+					}
+					else {
+						for (int j = 0; j < (-b) + 1; j++)
+							*(dest++) = *(src++);
+					}
+				} else {
+					b++;
+					while (b-- != 0) {
+						byte c = _banFiles[i]->readByte();
+						if (c == 0) {
+							dest++;
+							src++;
+						} else
+							*(dest++) = *(src++);
+					}
+				}
+			}
+
+			_gfx->unlockScreenPixels();
+			surface.free();
+
+			_banFileOffsets[i] = _banFiles[i]->pos();
+		}
+	}
+}
+
+void StarTrekEngine::removeActorFromScreen(int actorIndex) {
+	Actor *actor = &_actorList[actorIndex];
+
+	if (actor->spriteDrawn != 1)
+		return;
+
+	debugC(6, kDebugGraphics, "Stop drawing actor %d", actorIndex);
+
+	Sprite *sprite = &actor->sprite;
+	sprite->field16 = true;
+	sprite->bitmapChanged = true;
+	_gfx->drawAllSprites();
+	_gfx->delSprite(sprite);
+	releaseAnim(actor);
+}
+
+void StarTrekEngine::actorFunc1() {
+	for (int i = 0; i < NUM_ACTORS; i++) {
+		if (_actorList[i].spriteDrawn == 1) {
+			removeActorFromScreen(i);
+		}
+	}
+
+	for (int i = 0; i < MAX_BAN_FILES; i++) {
+		_banFiles[i].reset();
+	}
+}
+
+void StarTrekEngine::drawActorToScreen(Actor *actor, const Common::String &_animName, int16 x, int16 y, Fixed8 scale, bool addSprite) {
+	Common::String animFilename = _animName;
+	if (_animName.hasPrefixIgnoreCase("stnd") /* && word_45d20 == -1 */) // TODO
+		animFilename += 'j';
+	memcpy(actor->animFilename, _animName.c_str(), sizeof(actor->animFilename));
+
+	actor->animType = 2;
+	actor->animFile = loadFile(animFilename + ".anm");
+	actor->numAnimFrames = actor->animFile->size() / 22;
+	actor->animFrame = 0;
+	actor->pos.x = x;
+	actor->pos.y = y;
+	actor->field62 = 0;
+	actor->scale = scale;
+
+	actor->animFile->seek(16, SEEK_SET);
+	actor->frameToStartNextAnim = actor->animFile->readUint16() + _frameIndex;
+
+	char firstFrameFilename[11];
+	actor->animFile->seek(0, SEEK_SET);
+	actor->animFile->read(firstFrameFilename, 10);
+	firstFrameFilename[10] = '\0';
+
+	Sprite *sprite = &actor->sprite;
+	if (addSprite)
+		_gfx->addSprite(sprite);
+
+	sprite->setBitmap(loadAnimationFrame(firstFrameFilename, scale));
+	memset(actor->bitmapFilename, 0, sizeof(char) * 10);
+	strncpy(actor->bitmapFilename, firstFrameFilename, sizeof(char) * 9);
+
+	actor->scale = scale;
+
+	actor->animFile->seek(10, SEEK_SET);
+	uint16 xOffset = actor->animFile->readUint16();
+	uint16 yOffset = actor->animFile->readUint16();
+	uint16 basePriority = actor->animFile->readUint16();
+
+	sprite->pos.x = xOffset + actor->pos.x;
+	sprite->pos.y = yOffset + actor->pos.y;
+	sprite->drawPriority = _gfx->getPriValue(0, yOffset + actor->pos.y) + basePriority;
+	sprite->bitmapChanged = true;
+
+	actor->spriteDrawn = 1;
+}
+
+void StarTrekEngine::releaseAnim(Actor *actor) {
+	switch (actor->animType) {
+	case 0:
+	case 2:
+		actor->sprite.bitmap.reset();
+		actor->animFile.reset();
+		break;
+	case 1:
+		actor->sprite.bitmap.reset();
+		break;
+	default:
+		error("Invalid anim type");
+		break;
+	}
+
+	actor->spriteDrawn = 0;
+}
+
+void StarTrekEngine::initStandAnim(int actorIndex) {
+	Actor *actor = &_actorList[actorIndex];
+
+	if (!actor->spriteDrawn)
+		error("initStandAnim: dead anim");
+
+	////////////////////
+	// sub_239d2
+	const char *directions = "nsew";
+
+	if (actorIndex >= 0 && actorIndex <= 3) {
+		int8 dir = _awayMission.crewDirectionsAfterWalk[actorIndex];
+		if (dir != -1) {
+			actor->direction = directions[dir];
+			_awayMission.crewDirectionsAfterWalk[actorIndex] = -1;
+		}
+	}
+	// end of sub_239d2
+	////////////////////
+
+	Common::String animName;
+	if (actor->direction != 0)
+		animName = Common::String(actor->animationString) + (char)actor->direction;
+	else // Default to facing south
+		animName = Common::String(actor->animationString) + 's';
+
+	Fixed8 scale = getActorScaleAtPosition(actor->pos.y);
+	loadActorAnim(actorIndex, animName, actor->pos.x, actor->pos.y, scale);
+	actor->animType = 0;
+}
+
+void StarTrekEngine::updateActorPositionWhileWalking(Actor *actor, int16 x, int16 y) {
+	actor->scale = getActorScaleAtPosition(y);
+	Common::String animName = Common::String::format("%s%02d", actor->animationString2, actor->field92 & 7);
+	actor->sprite.setBitmap(loadAnimationFrame(animName, actor->scale));
+
+	memset(actor->bitmapFilename, 0, 10);
+	strncpy(actor->bitmapFilename, animName.c_str(), 9);
+
+	Sprite *sprite = &actor->sprite;
+	sprite->drawPriority = _gfx->getPriValue(0, y);
+	sprite->pos.x = x;
+	sprite->pos.y = y;
+	sprite->bitmapChanged = true;
+
+	actor->frameToStartNextAnim = _frameIndex;
+	actor->pos.x = x;
+	actor->pos.y = y;
+}
+
+void StarTrekEngine::chooseActorDirectionForWalking(Actor *actor, int16 srcX, int16 srcY, int16 destX, int16 destY) {
+	actor->granularPosX = srcX;
+	actor->granularPosY = srcY;
+
+	int16 distX = destX - srcX;
+	int16 distY = destY - srcY;
+	int16 absDistX = abs(distX);
+	int16 absDistY = abs(distY);
+
+	if (absDistX > absDistY) {
+		char d;
+		if (distX > 0)
+			d = 'E';
+		else
+			d = 'W';
+
+		// Append direction to animation string
+		actor->animationString2[strlen(actor->animationString2) + 1] = '\0';
+		actor->animationString2[strlen(actor->animationString2)] = d;
+
+		actor->direction = d;
+		actor->field90 = absDistX;
+
+		if (distX != 0) {
+			if (distX > 0)
+				actor->speedX = 1.0;
+			else
+				actor->speedX = -1.0;
+
+			actor->speedY = Fixed16(distY) / absDistX;
+		}
+	} else {
+		char d;
+		if (distY > 0)
+			d = 'S';
+		else
+			d = 'N';
+
+		// Append direction to animation string
+		actor->animationString2[strlen(actor->animationString2) + 1] = '\0';
+		actor->animationString2[strlen(actor->animationString2)] = d;
+
+		actor->direction = d;
+		actor->field90 = absDistY;
+
+		if (distY != 0) {
+			if (distY > 0)
+				actor->speedY = 1.0;
+			else
+				actor->speedY = -1.0;
+
+			actor->speedX = Fixed16(distX) / absDistY;
+		}
+	}
+}
+
+bool StarTrekEngine::directPathExists(int16 srcX, int16 srcY, int16 destX, int16 destY) {
+	int32 distX = destX - srcX;
+	int32 distY = destY - srcY;
+
+	int32 absDistX = abs(distX);
+	int32 absDistY = abs(distY);
+
+	int32 distCounter;
+	Fixed16 speedX, speedY;
+
+	if (absDistX > absDistY) {
+		distCounter = absDistX;
+
+		if (distCounter == 0)
+			return true;
+
+		speedY = Fixed16(distY) / absDistX;
+
+		if (distX > 0)
+			speedX = 1.0;
+		else
+			speedX = -1.0;
+	} else { // absDistX <= absDistY
+		distCounter = absDistY;
+
+		if (distCounter == 0)
+			return true;
+
+		speedX = Fixed16(distX) / absDistY;
+
+		if (distY > 0)
+			speedY = 1.0;
+		else
+			speedY = -1.0;
+	}
+
+	Fixed16 fixedX = srcX;
+	Fixed16 fixedY = srcY;
+
+	if (isPositionSolid((fixedX + 0.5).toInt(), (fixedY + 0.5).toInt()))
+		return false;
+
+	while (distCounter-- > 0) {
+		fixedX += speedX;
+		fixedY += speedY;
+
+		if (isPositionSolid((fixedX + 0.5).toInt(), (fixedY + 0.5).toInt()))
+			return false;
+	}
+
+	return true;
+}
+
+int StarTrekEngine::findObjectAt(int x, int y) {
+	Sprite *sprite = _gfx->getSpriteAt(x, y);
+
+	if (sprite != nullptr) {
+		if (sprite == &_inventoryIconSprite)
+			return OBJECT_INVENTORY_ICON;
+		else if (sprite == &_itemIconSprite)
+			return _awayMission.activeObject;
+
+		for (int i = 0; i < NUM_ACTORS; i++) {
+			Actor *actor = &_actorList[i];
+			if (sprite == &actor->sprite)
+				return i;
+		}
+
+		error("findObject: Clicked on an unknown sprite");
+	}
+
+	_objectHasWalkPosition = false;
+	int actionBit = 1 << (_awayMission.activeAction - 1);
+	int offset = _room->getFirstHotspot();
+
+	while (offset != _room->getHotspotEnd()) {
+		uint16 word = _room->readRdfWord(offset);
+		if (word & 0x8000) {
+			if ((word & actionBit) && isPointInPolygon((int16 *)(_room->_rdfData + offset + 6), x, y)) {
+				int actorIndex = _room->readRdfWord(offset + 6);
+				_objectHasWalkPosition = true;
+				_objectWalkPosition.x = _room->readRdfWord(offset + 2);
+				_objectWalkPosition.y = _room->readRdfWord(offset + 4);
+				return actorIndex;
+			}
+
+			int numVertices = _room->readRdfWord(offset + 8);
+			offset = offset + 10 + numVertices * 4;
+		} else {
+			if (isPointInPolygon((int16 *)(_room->_rdfData + offset), x, y)) {
+				int actorIndex = _room->readRdfWord(offset);
+				return actorIndex;
+			}
+
+			int numVertices = _room->readRdfWord(offset + 2);
+			offset = offset + 4 + numVertices * 4;
+		}
+	}
+
+	return -1;
+}
+
+SharedPtr<Bitmap> StarTrekEngine::loadAnimationFrame(const Common::String &filename, Fixed8 scale) {
+	SharedPtr<Bitmap> bitmapToReturn;
+
+	char basename[5];
+	strncpy(basename, filename.c_str() + 1, 4);
+	basename[4] = '\0';
+
+	char c = filename[0];
+	if ((strcmp(basename, "stnd") == 0 || strcmp(basename, "tele") == 0)
+	        && (c == 'm' || c == 's' || c == 'k' || c == 'r')) {
+		if (c == 'm') {
+			// Mccoy has the "base" animations for all crewmen
+			bitmapToReturn = _gfx->loadBitmap(filename);
+		} else {
+			// All crewman other than mccoy copy the animation frames from mccoy, change
+			// the colors of the uniforms, and load an "xor" file to redraw the face.
+
+			// TODO: The ".$bm" extension is a "virtual file"? Caches the changes to the
+			// file made here?
+			// bitmapToReturn = _gfx->loadBitmap(filename + ".$bm");
+
+			if (bitmapToReturn == nullptr) {
+				Common::String mccoyFilename = filename;
+				mccoyFilename.setChar('m', 0);
+				SharedPtr<Bitmap> bitmap = _gfx->loadBitmap(mccoyFilename);
+
+				uint16 width = bitmap->width;
+				uint16 height = bitmap->height;
+
+				bitmapToReturn = SharedPtr<Bitmap>(new Bitmap(width, height));
+				bitmapToReturn->xoffset = bitmap->xoffset;
+				bitmapToReturn->yoffset = bitmap->yoffset;
+
+				// Change uniform color
+				int16 colorShift;
+				switch (c) {
+				case 'k': // Kirk
+					colorShift = 8;
+					break;
+				case 'r': // Redshirt
+					colorShift = -8;
+					break;
+				case 's': // Spock
+					colorShift = 0;
+					break;
+				}
+
+				if (colorShift == 0) {
+					memcpy(bitmapToReturn->pixels, bitmap->pixels, width * height);
+				} else {
+					byte *src = bitmap->pixels;
+					byte *dest = bitmapToReturn->pixels;
+					byte baseUniformColor = 0xa8;
+
+					for (int i = 0; i < width * height; i++) {
+						byte b = *src++;
+						if (b >= baseUniformColor && b < baseUniformColor + 8)
+							*dest++ = b + colorShift;
+						else
+							*dest++ = b;
+					}
+				}
+
+				// Redraw face with xor file
+				SharedPtr<FileStream> xorFile = loadFile(filename + ".xor");
+				xorFile->seek(0, SEEK_SET);
+				uint16 xoffset = bitmap->xoffset - xorFile->readUint16();
+				uint16 yoffset = bitmap->yoffset - xorFile->readUint16();
+				uint16 xorWidth = xorFile->readUint16();
+				uint16 xorHeight = xorFile->readUint16();
+
+				byte *dest = bitmapToReturn->pixels + yoffset * bitmap->width + xoffset;
+
+				for (int i = 0; i < xorHeight; i++) {
+					for (int j = 0; j < xorWidth; j++)
+						*dest++ ^= xorFile->readByte();
+					dest += (bitmap->width - xorWidth);
+				}
+			}
+		}
+	} else {
+		// TODO: when loading a bitmap, it passes a different argument than is standard to
+		// the "file loading with cache" function...
+		bitmapToReturn = _gfx->loadBitmap(filename);
+	}
+
+	if (scale != 1.0) {
+		bitmapToReturn = scaleBitmap(bitmapToReturn, scale);
+	}
+
+	return bitmapToReturn;
+}
+
+
+int StarTrekEngine::selectObjectForUseAction() {
+	while (true) {
+		if (!(_awayMission.crewDownBitset & (1 << OBJECT_KIRK)))
+			showInventoryIcons(false);
+
+		TrekEvent event;
+
+		while (true) {
+			if (!getNextEvent(&event))
+				continue;
+
+			if (event.type == TREKEVENT_TICK) {
+				updateMouseBitmap();
+				_gfx->drawAllSprites();
+				_sound->checkLoopMusic();
+			} else if (event.type == TREKEVENT_LBUTTONDOWN) {
+				removeNextEvent();
+				break;
+			} else if (event.type == TREKEVENT_MOUSEMOVE) {
+			} else if (event.type == TREKEVENT_RBUTTONDOWN) {
+				// Allow this to be processed by main away mission loop
+				break;
+			} else if (event.type == TREKEVENT_KEYDOWN) {
+				if (event.kbd.keycode == Common::KEYCODE_ESCAPE
+				        || event.kbd.keycode == Common::KEYCODE_w
+				        || event.kbd.keycode == Common::KEYCODE_t
+				        || event.kbd.keycode == Common::KEYCODE_u
+				        || event.kbd.keycode == Common::KEYCODE_g
+				        || event.kbd.keycode == Common::KEYCODE_l
+				        || event.kbd.keycode == Common::KEYCODE_SPACE
+				        || event.kbd.keycode == Common::KEYCODE_F2) {
+					// Allow these buttons to be processed by main away mission loop
+					break;
+				} else if (event.kbd.keycode == Common::KEYCODE_i) {
+					removeNextEvent();
+					break;
+				} else if (event.kbd.keycode == Common::KEYCODE_RETURN || event.kbd.keycode == Common::KEYCODE_KP_ENTER || event.kbd.keycode == Common::KEYCODE_F1) {
+					// Simulate left-click
+					removeNextEvent();
+					event.type = TREKEVENT_LBUTTONDOWN;
+					break;
+				}
+			}
+
+			removeNextEvent();
+		}
+
+		if (event.type == TREKEVENT_KEYDOWN && event.kbd.keycode == Common::KEYCODE_i) {
+			hideInventoryIcons();
+			int clickedObject = showInventoryMenu(50, 50, true);
+			if (clickedObject == -1)
+				continue;
+			return clickedObject;
+		} else if (event.type == TREKEVENT_LBUTTONDOWN) {
+			int clickedObject = findObjectAt(_gfx->getMousePos());
+			hideInventoryIcons();
+
+			if (clickedObject == -1)
+				continue;
+			else if (isObjectUnusable(clickedObject, ACTION_USE))
+				continue;
+			else if (clickedObject == OBJECT_INVENTORY_ICON) {
+				clickedObject = showInventoryMenu(50, 50, false);
+				if (clickedObject == -1)
+					continue;
+				else
+					return clickedObject;
+			} else if (clickedObject <= OBJECT_REDSHIRT)
+				return clickedObject;
+			else if (isObjectUnusable(OBJECT_KIRK, ACTION_USE))
+				continue;
+			else if (_room->actionHasCode(ACTION_USE, OBJECT_KIRK, clickedObject, 0)
+			         || _room->actionHasCode(ACTION_GET, clickedObject, 0, 0)
+			         || _room->actionHasCode(ACTION_WALK, clickedObject, 0, 0)) {
+				_awayMission.activeObject = OBJECT_KIRK;
+				_awayMission.passiveObject = clickedObject;
+				_awayMission.activeAction = ACTION_USE;
+				clickedObject = OBJECT_KIRK;
+				if (!walkActiveObjectToHotspot())
+					addAction(_awayMission.activeAction, _awayMission.activeObject, _awayMission.passiveObject, 0);
+				return clickedObject;
+			} else
+				continue;
+		} else {
+			hideInventoryIcons();
+			return -1;
+		}
+	}
+}
+
+Common::String StarTrekEngine::getCrewmanAnimFilename(int actorIndex, const Common::String &basename) {
+	const char *crewmanChars = "ksmr";
+	assert(actorIndex >= 0 && actorIndex < 4);
+	return crewmanChars[actorIndex] + basename;
+}
+
+void StarTrekEngine::updateMouseBitmap() {
+	const bool worksOnCrewmen[] = { // True if the action reacts with crewmen
+		false, // ACTION_WALK
+		true,  // ACTION_USE
+		false, // ACTION_GET
+		true,  // ACTION_LOOK
+		true   // ACTION_TALK
+	};
+	const bool worksOnActors[] = { // True if the action reacts with other objects
+		false, // ACTION_WALK
+		true,  // ACTION_USE
+		true,  // ACTION_GET
+		true,  // ACTION_LOOK
+		true   // ACTION_TALK
+	};
+	const bool worksOnHotspots[] = { // True if the action reacts with hotspots
+		false, // ACTION_WALK
+		true,  // ACTION_USE
+		true,  // ACTION_GET
+		true,  // ACTION_LOOK
+		false  // ACTION_TALK
+	};
+
+	Common::Point mousePos = _gfx->getMousePos();
+	int selected = findObjectAt(mousePos.x, mousePos.y);
+	int action = _awayMission.activeAction;
+	assert(action >= 1 && action <= 5);
+
+	bool withRedOutline;
+
+	if (selected >= 0 && selected <= 3 && worksOnCrewmen[action - 1])
+		withRedOutline = true;
+	else if (selected > 3 && selected < NUM_ACTORS && worksOnActors[action - 1])
+		withRedOutline = true;
+	else if (selected >= NUM_ACTORS && selected < HOTSPOTS_END && worksOnHotspots[action - 1])
+		withRedOutline = true;
+	else
+		withRedOutline = false;
+
+	chooseMouseBitmapForAction(action, withRedOutline);
+}
+
+bool StarTrekEngine::walkActiveObjectToHotspot() {
+	if (!_objectHasWalkPosition)
+		return false;
+
+	int objectIndex;
+	if (_awayMission.activeAction != ACTION_USE)
+		objectIndex = OBJECT_KIRK;
+	else if (_awayMission.activeObject <= OBJECT_REDSHIRT)
+		objectIndex = _awayMission.activeObject;
+	else if (_awayMission.activeObject >= ITEMS_START && _awayMission.activeObject <= ITEMS_END) { // FIXME: "<= ITEMS_END" doesn't make sense?
+		if (_awayMission.activeObject == OBJECT_ISTRICOR)
+			objectIndex = OBJECT_SPOCK;
+		else if (_awayMission.activeObject == OBJECT_IMTRICOR)
+			objectIndex = OBJECT_MCCOY;
+		else
+			objectIndex = OBJECT_KIRK;
+	} else // This is the original error message...
+		error("Jay didn't think about pmcheck");
+
+	byte finishedAnimActionParam = false;
+	bool walk = false;
+
+	if (_awayMission.activeAction == ACTION_WALK)
+		walk = true;
+	else {
+		// If this action has code defined for it in this room, buffer the action to be
+		// done after the object finished walking there.
+		Action action = {_awayMission.activeAction, _awayMission.activeObject, 0, 0};
+		if (_awayMission.activeAction == ACTION_USE)
+			action.b2 = _awayMission.passiveObject;
+
+		if (_room->actionHasCode(action)) {
+			for (int i = 0; i < MAX_BUFFERED_WALK_ACTIONS; i++) {
+				if (!_actionOnWalkCompletionInUse[i]) {
+					finishedAnimActionParam = i + 0xe0;
+					_actionOnWalkCompletionInUse[i] = true;
+					_actionOnWalkCompletion[i] = action;
+					walk = true;
+					break;
+				}
+			}
+		}
+	}
+
+	if (walk) {
+		Actor *actor = &_actorList[objectIndex];
+		Common::String anim = getCrewmanAnimFilename(objectIndex, "walk");
+		actorWalkToPosition(objectIndex, anim, actor->pos.x, actor->pos.y, _objectWalkPosition.x, _objectWalkPosition.y);
+		if (finishedAnimActionParam != 0) {
+			actor->triggerActionWhenAnimFinished = true;
+			actor->finishedAnimActionParam = finishedAnimActionParam;
+		}
+		_objectHasWalkPosition = false;
+		return true;
+	} else {
+		_objectHasWalkPosition = false;
+		return false;
+	}
+}
+
+void StarTrekEngine::showInventoryIcons(bool showItem) {
+	const char *crewmanFilenames[] = {
+		"ikirk",
+		"ispock",
+		"imccoy",
+		"iredshir"
+	};
+
+	Common::String itemFilename;
+
+	if (showItem) {
+		int i = _awayMission.activeObject;
+		if (i >= OBJECT_KIRK && i <= OBJECT_REDSHIRT)
+			itemFilename = crewmanFilenames[i];
+		else {
+			assert(i >= ITEMS_START && i < ITEMS_END);
+			Item *item = &_itemList[i - ITEMS_START];
+			itemFilename = item->name;
+		}
+	}
+
+	if (itemFilename.empty())
+		_inventoryIconSprite.pos.x = 10;
+	else {
+		_gfx->addSprite(&_itemIconSprite);
+		_itemIconSprite.drawMode = 2;
+		_itemIconSprite.pos.x = 10;
+		_itemIconSprite.pos.y = 10;
+		_itemIconSprite.drawPriority = 15;
+		_itemIconSprite.drawPriority2 = 8;
+		_itemIconSprite.setBitmap(_gfx->loadBitmap(itemFilename));
+
+		_inventoryIconSprite.pos.x = 46;
+	}
+
+	_gfx->addSprite(&_inventoryIconSprite);
+
+	_inventoryIconSprite.pos.y = 10;
+	_inventoryIconSprite.drawMode = 2;
+	_inventoryIconSprite.drawPriority = 15;
+	_inventoryIconSprite.drawPriority2 = 8;
+	_inventoryIconSprite.setBitmap(_gfx->loadBitmap("inv00"));
+}
+
+bool StarTrekEngine::isObjectUnusable(int object, int action) {
+	if (action == ACTION_LOOK)
+		return false;
+	if (object == OBJECT_REDSHIRT && _awayMission.redshirtDead)
+		return true;
+	if (object >= OBJECT_KIRK && object <= OBJECT_REDSHIRT && (_awayMission.crewDownBitset & (1 << object)))
+		return true;
+	if (object == OBJECT_IMTRICOR && (_awayMission.crewDownBitset & (1 << OBJECT_MCCOY)))
+		return true;
+	if (object == OBJECT_ISTRICOR && (_awayMission.crewDownBitset & (1 << OBJECT_SPOCK)))
+		return true;
+	return false;
+}
+
+void StarTrekEngine::hideInventoryIcons() {
+	// Clear these sprites from the screen
+	if (_itemIconSprite.drawMode == 2)
+		_itemIconSprite.dontDrawNextFrame();
+	if (_inventoryIconSprite.drawMode == 2)
+		_inventoryIconSprite.dontDrawNextFrame();
+
+	_gfx->drawAllSprites();
+
+	if (_itemIconSprite.drawMode == 2) {
+		_gfx->delSprite(&_itemIconSprite);
+		_itemIconSprite.drawMode = 0;
+		_itemIconSprite.bitmap.reset();
+	}
+
+	if (_inventoryIconSprite.drawMode == 2) {
+		_gfx->delSprite(&_inventoryIconSprite);
+		_inventoryIconSprite.drawMode = 0;
+		_inventoryIconSprite.bitmap.reset();
+	}
+}
+
+void StarTrekEngine::updateCrewmanGetupTimers() {
+	if (_awayMission.crewDownBitset == 0)
+		return;
+	for (int i = OBJECT_KIRK; i <= OBJECT_REDSHIRT; i++) {
+		Actor *actor = &_actorList[i];
+
+		if (!(_awayMission.crewDownBitset & (1 << i)))
+			continue;
+
+		_awayMission.crewGetupTimers[i]--;
+		if (_awayMission.crewGetupTimers[i] <= 0) {
+			Common::String anim = getCrewmanAnimFilename(i, "getu");
+			int8 dir = _awayMission.crewDirectionsAfterWalk[i];
+			char d;
+			if (dir == -1) {
+				d = actor->direction;
+			} else {
+				const char *dirs = "nsew";
+				Fixed8 scale = getActorScaleAtPosition(actor->sprite.pos.y);
+				d = dirs[dir];
+
+				int16 xOffset = 0, yOffset = 0;
+				if (d == 'n') {
+					xOffset = -24;
+					yOffset = -8;
+				} else if (d == 'w') {
+					xOffset = -35;
+					yOffset = -12;
+				}
+				actor->sprite.pos.x += scale.multToInt(xOffset);
+				actor->sprite.pos.y += scale.multToInt(yOffset);
+			}
+
+			anim += (char)d;
+			loadActorAnimWithRoomScaling(i, anim, actor->sprite.pos.x, actor->sprite.pos.y);
+			_awayMission.crewDownBitset &= ~(1 << i);
+		}
+	}
+}
+
+int StarTrekEngine::showInventoryMenu(int x, int y, bool restoreMouse) {
+	const int ITEMS_PER_ROW = 5;
+
+	Common::Point oldMousePos = _gfx->getMousePos();
+	bool keyboardControlledMouse = _keyboardControlsMouse;
+	_keyboardControlsMouse = false;
+
+	int itemIndex = 0;
+	int numItems = 0;
+
+	char itemNames[NUM_OBJECTS][10];
+	Common::Point itemPositions[NUM_OBJECTS];
+	int16 itemIndices[NUM_OBJECTS];
+
+	while (itemIndex < NUM_OBJECTS) {
+		if (_itemList[itemIndex].have) {
+			strcpy(itemNames[numItems], _itemList[itemIndex].name);
+
+			int16 itemX = (numItems % ITEMS_PER_ROW) * 32 + x;
+			int16 itemY = (numItems / ITEMS_PER_ROW) * 32 + y;
+			itemPositions[numItems] = Common::Point(itemX, itemY);
+			itemIndices[numItems] = _itemList[itemIndex].field2;
+
+			numItems++;
+		}
+		itemIndex++;
+	}
+
+	Sprite itemSprites[NUM_OBJECTS];
+
+	for (int i = 0; i < numItems; i++) {
+		_gfx->addSprite(&itemSprites[i]);
+
+		itemSprites[i].drawMode = 2;
+		itemSprites[i].pos.x = itemPositions[i].x;
+		itemSprites[i].pos.y = itemPositions[i].y;
+		itemSprites[i].drawPriority = 15;
+		itemSprites[i].drawPriority2 = 8;
+		itemSprites[i].setBitmap(_gfx->loadBitmap(itemNames[i]));
+	}
+
+	chooseMousePositionFromSprites(itemSprites, numItems, -1, 4);
+	bool displayMenu = true;
+	int lastItemIndex = -1;
+
+	while (displayMenu) {
+		_sound->checkLoopMusic();
+
+		TrekEvent event;
+		if (!getNextEvent(&event))
+			continue;
+
+		switch (event.type) {
+		case TREKEVENT_TICK: {
+			Common::Point mousePos = _gfx->getMousePos();
+			itemIndex = getMenuButtonAt(itemSprites, numItems, mousePos.x, mousePos.y);
+			if (itemIndex != lastItemIndex) {
+				if (lastItemIndex != -1) {
+					drawMenuButtonOutline(itemSprites[lastItemIndex].bitmap, 0);
+					itemSprites[lastItemIndex].bitmapChanged = true;
+				}
+				if (itemIndex != -1) {
+					drawMenuButtonOutline(itemSprites[itemIndex].bitmap, 15);
+					itemSprites[itemIndex].bitmapChanged = true;
+				}
+				lastItemIndex = itemIndex;
+			}
+			_gfx->drawAllSprites();
+			break;
+		}
+
+		case TREKEVENT_LBUTTONDOWN:
+exitWithSelection:
+			displayMenu = false;
+			break;
+
+		case TREKEVENT_RBUTTONDOWN:
+exitWithoutSelection:
+			displayMenu = false;
+			lastItemIndex = -1;
+			break;
+
+		case TREKEVENT_KEYDOWN:
+			switch (event.kbd.keycode) {
+			case Common::KEYCODE_ESCAPE:
+			case Common::KEYCODE_F2:
+				goto exitWithoutSelection;
+
+			case Common::KEYCODE_RETURN:
+			case Common::KEYCODE_KP_ENTER:
+			case Common::KEYCODE_F1:
+				goto exitWithSelection;
+
+			case Common::KEYCODE_HOME:
+			case Common::KEYCODE_KP7:
+				chooseMousePositionFromSprites(itemSprites, numItems, lastItemIndex, 4);
+				break;
+
+			case Common::KEYCODE_UP:
+			case Common::KEYCODE_KP8:
+			case Common::KEYCODE_PAGEUP:
+			case Common::KEYCODE_KP9:
+				chooseMousePositionFromSprites(itemSprites, numItems, lastItemIndex, 2);
+				break;
+
+			case Common::KEYCODE_LEFT:
+			case Common::KEYCODE_KP4:
+				chooseMousePositionFromSprites(itemSprites, numItems, lastItemIndex, 1);
+				break;
+
+			case Common::KEYCODE_RIGHT:
+			case Common::KEYCODE_KP6:
+				chooseMousePositionFromSprites(itemSprites, numItems, lastItemIndex, 0);
+				break;
+
+			case Common::KEYCODE_END:
+			case Common::KEYCODE_KP1:
+				chooseMousePositionFromSprites(itemSprites, numItems, lastItemIndex, 5);
+				break;
+
+			case Common::KEYCODE_DOWN:
+			case Common::KEYCODE_KP2:
+			case Common::KEYCODE_PAGEDOWN:
+			case Common::KEYCODE_KP3:
+				chooseMousePositionFromSprites(itemSprites, numItems, lastItemIndex, 3);
+				break;
+
+			default:
+				break;
+			}
+			break;
+
+		default:
+			break;
+		}
+
+		removeNextEvent();
+	}
+
+	playSoundEffectIndex(0x10);
+	if (lastItemIndex >= 0)
+		drawMenuButtonOutline(itemSprites[lastItemIndex].bitmap, 0);
+
+	for (int i = 0; i < numItems; i++)
+		itemSprites[i].dontDrawNextFrame();
+
+	_gfx->drawAllSprites();
+
+	for (int i = 0; i < numItems; i++) {
+		itemSprites[i].bitmap.reset();
+		_gfx->delSprite(&itemSprites[i]);
+	}
+
+	if (lastItemIndex >= 0) {
+		lastItemIndex = itemIndices[lastItemIndex];
+	}
+
+	if (restoreMouse)
+		_gfx->warpMouse(oldMousePos.x, oldMousePos.y);
+
+	_keyboardControlsMouse = keyboardControlledMouse;
+	return lastItemIndex;
+}
+
+void StarTrekEngine::initStarfieldSprite(Sprite *sprite, SharedPtr<Bitmap> bitmap, const Common::Rect &rect) {
+	sprite->setXYAndPriority(rect.left, rect.top, 0);
+	sprite->setBitmap(bitmap);
+	bitmap->xoffset = 0;
+	bitmap->yoffset = 0;
+	bitmap->width = rect.width();
+	bitmap->height = rect.height();
+	_gfx->addSprite(sprite);
+	sprite->drawMode = 1;
+}
+
+SharedPtr<Bitmap> StarTrekEngine::scaleBitmap(SharedPtr<Bitmap> bitmap, Fixed8 scale) {
+	int scaledWidth  = scale.multToInt(bitmap->width);
+	int scaledHeight = scale.multToInt(bitmap->height);
+	int origWidth  = bitmap->width;
+	int origHeight = bitmap->height;
+
+	if (scaledWidth < 1)
+		scaledWidth = 1;
+	if (scaledHeight < 1)
+		scaledHeight = 1;
+
+	SharedPtr<Bitmap> scaledBitmap(new Bitmap(scaledWidth, scaledHeight));
+	scaledBitmap->xoffset = scale.multToInt(bitmap->xoffset);
+	scaledBitmap->yoffset = scale.multToInt(bitmap->yoffset);
+
+	// sub_344a5(scaledWidth, origWidth);
+
+	origHeight--;
+	scaledHeight--;
+
+	byte *src = bitmap->pixels;
+	byte *dest = scaledBitmap->pixels;
+
+	if (scale <= 1.0) {
+		int16 var2e = 0;
+		uint16 var30 = scaledHeight << 1;
+		uint16 var32 = (scaledHeight - origHeight) << 1;
+		uint16 origRow = 0;
+
+		while (origRow <= origHeight) {
+			if (var2e < 0) {
+				var2e += var30;
+			} else {
+				var2e += var32;
+				scaleBitmapRow(src, dest, origWidth, scaledWidth);
+				dest += scaledWidth;
+			}
+
+			src += bitmap->width;
+			origRow++;
+		}
+	} else {
+		int16 var2e = (origHeight << 1) - scaledHeight;
+		uint16 var30 = origHeight << 1;
+		uint16 var32 = (origHeight - scaledHeight) << 1;
+		uint16 srcRowChanged = true;
+		origWidth = bitmap->width;
+		uint16 scaledRow = 0;
+		byte *rowData = new byte[scaledWidth];
+
+		while (scaledRow++ <= scaledHeight) {
+			if (srcRowChanged) {
+				scaleBitmapRow(src, rowData, origWidth, scaledWidth);
+				srcRowChanged = false;
+			}
+
+			memcpy(dest, rowData, scaledWidth);
+			dest += scaledWidth;
+
+			if (var2e < 0) {
+				var2e += var30;
+			} else {
+				var2e += var32;
+				src += origWidth;
+				srcRowChanged = true;
+			}
+		}
+
+		delete[] rowData;
+	}
+
+	return scaledBitmap;
+}
+
+void StarTrekEngine::scaleBitmapRow(byte *src, byte *dest, uint16 origWidth, uint16 scaledWidth) {
+	if (origWidth >= scaledWidth) {
+		int16 var2 = (scaledWidth << 1) - origWidth;
+		uint16 var4 = scaledWidth << 1;
+		uint16 var6 = (scaledWidth - origWidth) << 1;
+		uint16 varE = 0;
+		uint16 varA = 0;
+		uint16 var8 = origWidth;
+		uint16 di = 0;
+
+		while (var8-- != 0) {
+			if (var2 < 0) {
+				var2 += var4;
+			} else {
+				var2 += var6;
+				if (di != 0) {
+					if (varE != 0) {
+						*(dest - 1) = *src++;
+						varE = 0;
+						di--;
+					}
+					src += di;
+					di = 0;
+				}
+				*dest++ = *src;
+				varE = 1;
+			}
+
+			di++;
+			varA++;
+		}
+	} else {
+		int16 var2 = ((origWidth - 1) << 1) - (scaledWidth - 1);
+		uint16 var4 = (origWidth - 1) << 1;
+		uint16 var6 = ((origWidth - 1) - (scaledWidth - 1)) << 1;
+		uint16 varA = 0;
+		uint16 var8 = scaledWidth;
+		uint16 di = 0;
+
+		while (var8-- != 0) {
+			if (di != 0) {
+				src += di;
+				di = 0;
+			}
+			*dest++ = *src;
+
+			if (var2 < 0)
+				var2 += var4;
+			else {
+				var2 += var6;
+				di++;
+			}
+
+			varA++;
+		}
+	}
+}
+
+} // End of namespace StarTrek