Initial commit

engines/pegasus/transition.cpp

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+/* 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.
+ *
+ * Additional copyright for this file:
+ * Copyright (C) 1995-1997 Presto Studios, Inc.
+ *
+ * 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/surface.h"
+
+#include "pegasus/transition.h"
+
+namespace Pegasus {
+
+ScreenFader::ScreenFader() {
+	_isBlack = true;
+	// Initially, assume screens are on at full brightness.
+	Fader::setFaderValue(100);
+}
+
+ScreenFader::~ScreenFader() {
+	_screen.free();
+}
+
+void ScreenFader::doFadeOutSync(const TimeValue duration, const TimeValue scale, bool isBlack) {
+	_isBlack = isBlack;
+	_screen.copyFrom(*g_system->lockScreen());
+	g_system->unlockScreen();
+
+	FaderMoveSpec spec;
+	spec.makeTwoKnotFaderSpec(scale, 0, getFaderValue(), duration, 0);
+	startFaderSync(spec);
+
+	_screen.free();
+}
+
+void ScreenFader::doFadeInSync(const TimeValue duration, const TimeValue scale, bool isBlack) {
+	_isBlack = isBlack;
+	_screen.copyFrom(*g_system->lockScreen());
+	g_system->unlockScreen();
+
+	FaderMoveSpec spec;
+	spec.makeTwoKnotFaderSpec(scale, 0, getFaderValue(), duration, 100);
+	startFaderSync(spec);
+
+	_screen.free();
+}
+
+void ScreenFader::setFaderValue(const int32 value) {
+	if (value != getFaderValue()) {
+		Fader::setFaderValue(value);
+
+		if (_screen.getPixels()) {
+			// The original game does a gamma fade here using the Mac API. In order to do
+			// that, it would require an immense amount of CPU processing. This does a
+			// linear fade instead, which looks fairly well, IMO.
+			Graphics::Surface *screen = g_system->lockScreen();
+
+			for (int y = 0; y < _screen.h; y++) {
+				for (int x = 0; x < _screen.w; x++) {
+					if (_screen.format.bytesPerPixel == 2)
+						WRITE_UINT16(screen->getBasePtr(x, y), fadePixel(READ_UINT16(_screen.getBasePtr(x, y)), value));
+					else
+						WRITE_UINT32(screen->getBasePtr(x, y), fadePixel(READ_UINT32(_screen.getBasePtr(x, y)), value));
+				}
+			}
+
+			g_system->unlockScreen();
+			g_system->updateScreen();
+		}
+	}
+}
+
+static inline byte fadeComponent(byte comp, int32 percent) {
+	return comp * percent / 100;
+}
+
+uint32 ScreenFader::fadePixel(uint32 color, int32 percent) const {
+	byte r, g, b;
+	_screen.format.colorToRGB(color, r, g, b);
+
+	if (_isBlack) {
+		r = fadeComponent(r, percent);
+		g = fadeComponent(g, percent);
+		b = fadeComponent(b, percent);
+	} else {
+		r = 0xFF - fadeComponent(0xFF - r, percent);
+		g = 0xFF - fadeComponent(0xFF - g, percent);
+		b = 0xFF - fadeComponent(0xFF - b, percent);
+	}
+
+	return _screen.format.RGBToColor(r, g, b);
+}
+
+Transition::Transition(const DisplayElementID id) : FaderAnimation(id) {
+	_outPicture = nullptr;
+	_inPicture = nullptr;
+}
+
+void Transition::setBounds(const Common::Rect &r) {
+	FaderAnimation::setBounds(r);
+	_boundsWidth = _bounds.width();
+	_boundsHeight = _bounds.height();
+}
+
+void Transition::setInAndOutElements(DisplayElement *inElement, DisplayElement *outElement) {
+	_inPicture = inElement;
+	_outPicture = outElement;
+
+	Common::Rect r;
+
+	if (_outPicture)
+		_outPicture->getBounds(r);
+	else if (_inPicture)
+		_inPicture->getBounds(r);
+
+	setBounds(r);
+}
+
+void Slide::draw(const Common::Rect &r) {
+	Common::Rect oldBounds, newBounds;
+
+	adjustSlideRects(oldBounds, newBounds);
+	drawElements(r, oldBounds, newBounds);
+}
+
+void Slide::adjustSlideRects(Common::Rect &oldBounds, Common::Rect &newBounds) {
+	oldBounds = _bounds;
+	newBounds = _bounds;
+}
+
+void Slide::drawElements(const Common::Rect &drawRect, const Common::Rect &oldBounds, const Common::Rect &newBounds) {
+	drawSlideElement(drawRect, oldBounds, _outPicture);
+	drawSlideElement(drawRect, newBounds, _inPicture);
+}
+
+void Slide::drawSlideElement(const Common::Rect &drawRect, const Common::Rect &oldBounds, DisplayElement *picture) {
+	if (picture && drawRect.intersects(oldBounds)) {
+		picture->moveElementTo(oldBounds.left, oldBounds.top);
+		picture->draw(drawRect.findIntersectingRect(oldBounds));
+	}
+}
+
+void Push::adjustSlideRects(Common::Rect &oldBounds, Common::Rect &newBounds) {
+	switch (_direction & kSlideHorizMask) {
+	case kSlideLeftMask:
+		newBounds.left = oldBounds.right = _bounds.right - pegasusRound(getFaderValue() * _boundsWidth, kTransitionRange);
+		newBounds.right = newBounds.left + _boundsWidth;
+		oldBounds.left = oldBounds.right - _boundsWidth;
+		break;
+	case kSlideRightMask:
+		oldBounds.left = newBounds.right = _bounds.left + pegasusRound(getFaderValue() * _boundsWidth, kTransitionRange);
+		oldBounds.right = oldBounds.left + _boundsWidth;
+		newBounds.left = newBounds.right - _boundsWidth;
+		break;
+	default:
+		newBounds.left = oldBounds.left = _bounds.left;
+		newBounds.right = oldBounds.right = _bounds.right;
+		break;
+	}
+
+	switch (_direction & kSlideVertMask) {
+	case kSlideDownMask:
+		oldBounds.top = newBounds.bottom = _bounds.top + pegasusRound(getFaderValue() * _boundsHeight, kTransitionRange);
+		oldBounds.bottom = oldBounds.top + _boundsHeight;
+		newBounds.top = newBounds.bottom - _boundsHeight;
+		break;
+	case kSlideUpMask:
+		newBounds.top = oldBounds.bottom = _bounds.bottom - pegasusRound(getFaderValue() * _boundsHeight, kTransitionRange);
+		newBounds.bottom = newBounds.top + _boundsHeight;
+		oldBounds.top = oldBounds.bottom - _boundsHeight;
+		break;
+	default:
+		newBounds.top = oldBounds.top = _bounds.top;
+		newBounds.bottom = oldBounds.bottom = _bounds.bottom;
+		break;
+	}
+}
+
+} // End of namespace Pegasus