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/* ScummVM - Scumm Interpreter
* Copyright (C) 2005-2006 The ScummVM project
*
* 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.
*
* $URL$
* $Id$
*
*/
#include "lure/animseq.h"
#include "lure/palette.h"
#include "lure/decode.h"
#include "lure/events.h"
namespace Lure {
// delay
// Delays for a given number of milliseconds. If it returns true, it indicates that
// Escape has been pressed, and the introduction should be aborted.
AnimAbortType AnimationSequence::delay(uint32 milliseconds) {
uint32 delayCtr = _system.getMillis() + milliseconds;
Events &events = Events::getReference();
while (_system.getMillis() < delayCtr) {
while (events.pollEvent()) {
if (events.type() == OSystem::EVENT_KEYDOWN) {
if (events.event().kbd.keycode == 27) return ABORT_END_INTRO;
else return ABORT_NEXT_SCENE;
} else if (events.type() == OSystem::EVENT_LBUTTONDOWN)
return ABORT_NEXT_SCENE;
else if (events.type() == OSystem::EVENT_QUIT)
return ABORT_END_INTRO;
}
uint32 delayAmount = delayCtr - _system.getMillis();
if (delayAmount > 10) delayAmount = 10;
_system.delayMillis(delayAmount);
}
return ABORT_NONE;
}
// decodeFrame
// Decodes a single frame of the animation sequence
void AnimationSequence::decodeFrame(byte *&pPixels, byte *&pLines) {
byte *screen = _screen.screen_raw();
uint16 screenPos = 0;
uint16 len;
while (screenPos < SCREEN_SIZE) {
// Get line length
len = (uint16) *pLines++;
if (len == 0) {
len = READ_LE_UINT16(pLines);
pLines += 2;
}
// Move the splice over
memcpy(screen, pPixels, len);
screen += len;
screenPos += len;
pPixels += len;
// Get the offset inc amount
len = (uint16) *pLines++;
if (len == 0) {
len = READ_LE_UINT16(pLines);
pLines += 2;
}
screen += len;
screenPos += len;
}
// Make the decoded frame visible
_screen.update();
}
AnimationSequence::AnimationSequence(Screen &screen, OSystem &system, uint16 screenId, Palette &palette,
bool fadeIn): _screen(screen), _system(system), _screenId(screenId), _palette(palette) {
PictureDecoder decoder;
Disk &d = Disk::getReference();
MemoryBlock *data = d.getEntry(_screenId);
_decodedData = decoder.decode(data, MAX_ANIM_DECODER_BUFFER_SIZE);
delete data;
_lineRefs = d.getEntry(_screenId + 1);
// Show the screen that preceeds the start of the animation data
_screen.setPaletteEmpty();
_screen.screen().data().copyFrom(_decodedData, 0, 0, FULL_SCREEN_HEIGHT * FULL_SCREEN_WIDTH);
_screen.update();
// Set the palette
if (fadeIn) _screen.paletteFadeIn(&_palette);
else _screen.setPalette(&_palette);
// Set up frame poitners
_pPixels = _decodedData->data() + SCREEN_SIZE;
_pLines = _lineRefs->data();
_pPixelsEnd = _decodedData->data() + _decodedData->size() - 1;
_pLinesEnd = _lineRefs->data() + _lineRefs->size() - 1;
}
AnimationSequence::~AnimationSequence() {
delete _lineRefs;
delete _decodedData;
}
// show
// Main method for displaying the animation
AnimAbortType AnimationSequence::show() {
AnimAbortType result;
// Loop through displaying the animations
while ((_pPixels < _pPixelsEnd) && (_pLines < _pLinesEnd)) {
decodeFrame(_pPixels, _pLines);
result = delay(130);
if (result != ABORT_NONE) return result;
}
return ABORT_NONE;
}
bool AnimationSequence::step() {
if ((_pPixels >= _pPixelsEnd) || (_pLines >= _pLinesEnd)) return false;
decodeFrame(_pPixels, _pLines);
_screen.setPalette(&_palette);
return true;
}
} // end of namespace Lure
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