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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.
*
* 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 "engines/nancy/nancy.h"
#include "engines/nancy/graphics.h"
#include "engines/nancy/misc/specialeffect.h"
namespace Nancy {
namespace Misc {
void SpecialEffect::init() {
if (g_nancy->getGameType() <= kGameTypeNancy6) {
// nancy2-6 have a fixed number of frames for the effect, which is defined in the SPEC chunk
auto *specialEffectData = GetEngineData(SPEC);
assert(specialEffectData);
_numFrames = _type == kBlackout ? specialEffectData->fadeToBlackNumFrames : specialEffectData->crossDissolveNumFrames;
_frameTime = _type == kBlackout ? specialEffectData->fadeToBlackFrameTime : _frameTime;
// We use the type definitions in nancy7, which are 1-indexed
++_type;
}
// nancy7 got rid of the SPEC chunk, and the data now contains the total amount of time
// that the effect should run for instead.
if (_rect.isEmpty()) {
if (g_nancy->getGameType() <= kGameTypeNancy6 && _type == kCrossDissolve) {
// Earlier games did the whole screen (most easily testable in the nancy3 intro if one moves the scrollbar)
_rect = Common::Rect(640, 480);
} else {
const VIEW *viewportData = (const VIEW *)g_nancy->getEngineData("VIEW");
assert(viewportData);
_rect = viewportData->screenPosition;
}
}
_drawSurface.create(_rect.width(), _rect.height(), g_nancy->_graphics->getScreenPixelFormat());
moveTo(_rect);
setTransparent(false);
RenderObject::init();
}
void SpecialEffect::updateGraphics() {
if (_numFrames) {
// Early version with constant number of frames, linear interpolation
if (g_nancy->getTotalPlayTime() > _nextFrameTime && _currentFrame < (int)_numFrames && isInitialized()) {
++_currentFrame;
_nextFrameTime += _frameTime;
GraphicsManager::crossDissolve(_fadeFrom, _fadeTo, 255 * _currentFrame / _numFrames, _rect, _drawSurface);
setVisible(true);
}
} else {
// nancy7+ version, draws as many frames as possible, ease in/out interpolation
if (_startTime == 0) {
_startTime = g_nancy->getTotalPlayTime();
// The original code times how long the first frame takes to draw,
// divides the total time by that time, and uses the result to
// decide how many frames need to be drawn. This results in highly
// variable timing depending on the machine the game is played on.
// On modern PCs, it even results in a divide by 0 that effectively
// stops the special effect from playing. Using the original _totalTime
// value results in the effect taking much longer than the developers
// intended (as made obvious in the dog scare sequence in the beginning
// of nancy7), so we manually shorten the timings to better match what
// the developers would've seen when on their machines.
_totalTime /= 2;
_fadeToBlackTime /= 2;
}
if (g_nancy->getTotalPlayTime() > _startTime + _totalTime && (_type != kThroughBlack || _throughBlackStarted2nd)) {
if (_currentFrame == 0) {
// Ensure at least one dissolve frame is shown
++_currentFrame;
GraphicsManager::crossDissolve(_fadeFrom, _fadeTo, 128, _rect, _drawSurface);
setVisible(true);
}
} else {
// Use a curve for all fades. Not entirely accurate to the original engine,
// since that pre-calculated the number of frames and did some exponent magic on them
float alpha = (float)(g_nancy->getTotalPlayTime() - _startTime) / (float)_totalTime;
bool start2nd = alpha > 1;
alpha = alpha * alpha * (3.0 - 2.0 * alpha);
alpha *= 255;
GraphicsManager::crossDissolve(_fadeFrom, _fadeTo, alpha, _rect, _drawSurface);
setVisible(true);
++_currentFrame;
if (start2nd && _type == kThroughBlack) {
_throughBlackStarted2nd = true;
_fadeFrom.clear();
setVisible(false);
g_nancy->_graphics->screenshotScreen(_fadeTo);
setVisible(true);
_startTime = g_nancy->getTotalPlayTime();
_currentFrame = 0;
}
}
}
}
void SpecialEffect::onSceneChange() {
g_nancy->_graphics->screenshotScreen(_fadeFrom);
_drawSurface.rawBlitFrom(_fadeFrom, _rect, Common::Point());
}
void SpecialEffect::afterSceneChange() {
if (_fadeFrom.empty()) {
return;
}
if (_type == kCrossDissolve) {
g_nancy->_graphics->screenshotScreen(_fadeTo);
} else {
_fadeTo.create(640, 480, _drawSurface.format);
_fadeTo.clear();
}
// Workaround for the way ManagedSurface handles transparency. Both pure black
// and pure white appear in scenes with SpecialEffects, and those happen to be
// the two default values transBlitFrom uses for transColor. By doing this,
// transColor gets set to the one color guaranteed to not appear in any scene,
// and transparency works correctly
_fadeTo.setTransparentColor(g_nancy->_graphics->getTransColor());
registerGraphics();
_nextFrameTime = g_nancy->getTotalPlayTime() + _frameTime;
_fadeToBlackEndTime = g_nancy->getTotalPlayTime() + _totalTime + _fadeToBlackTime;
_initialized = true;
}
bool SpecialEffect::isDone() const {
if (_type == kBlackout) {
return g_nancy->getTotalPlayTime() > _fadeToBlackEndTime;
} else {
bool canFinish = (_type == kThroughBlack) ? _throughBlackStarted2nd : true;
return _totalTime ? ((g_nancy->getTotalPlayTime() > _startTime + _totalTime) && (_currentFrame != 0) && canFinish) : (_currentFrame >= (int)_numFrames);
}
}
} // End of namespace Misc
} // End of namespace Nancy
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