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screen.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 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: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-11-1/engines/lure/screen.cpp $
 * $Id: screen.cpp 30944 2008-02-23 22:50:18Z sev $
 *
 */

#include "lure/screen.h"
#include "lure/luredefs.h"
#include "lure/memory.h"
#include "lure/disk.h"
#include "lure/decode.h"
#include "lure/events.h"

namespace Lure {

static Screen *int_disk = NULL;

Screen &Screen::getReference() {
      return *int_disk;
}

Screen::Screen(OSystem &system): _system(system), 
            _screen(new Surface(FULL_SCREEN_WIDTH, FULL_SCREEN_HEIGHT)), 
            _disk(Disk::getReference()),
            _palette(new Palette(GAME_PALETTE_RESOURCE_ID)) {
      int_disk = this;
      _screen->empty();
      _system.setPalette(_palette->data(), 0, GAME_COLOURS);
}

Screen::~Screen() {
      delete _screen;
      delete _palette;
}

// setPaletteEmpty
// Defaults the palette to an empty set

void Screen::setPaletteEmpty(int numEntries) {
      Palette emptyPalette(numEntries, NULL, RGB64);
      _system.setPalette(emptyPalette.data(), 0, numEntries);
      _palette->copyFrom(&emptyPalette);
/*
      delete _palette;
      _palette = new Palette();

      _system.setPalette(_palette->data(), 0, numEntries);
*/
      _system.updateScreen();
}

// setPalette
// Sets the current palette to the passed palette

void Screen::setPalette(Palette *p) {
      _palette->copyFrom(p);
      _system.setPalette(_palette->data(), 0, GAME_COLOURS);
      _system.updateScreen();
}

// setPalette
// Variation that allows the specification of a subset of a palette passed in to be copied

void Screen::setPalette(Palette *p, uint16 start, uint16 num) {
      _palette->palette()->copyFrom(p->palette(), start * 4, start * 4, num * 4);
      _system.setPalette(_palette->data(), start, num);
      _system.updateScreen();
}

// paletteFadeIn
// Fades in the palette. For proper operation, the palette should have been
// previously set to empty

void Screen::paletteFadeIn(Palette *p) {
      assert(p->numEntries() <= _palette->numEntries());
      Events &events = Events::getReference();
      bool changed;

      do {
            changed = false;
            byte *pFinal = p->data();
            byte *pCurrent = _palette->data();

            for (int palCtr = 0; palCtr < p->numEntries() * PALETTE_FADE_INC_SIZE; ++palCtr, ++pCurrent, ++pFinal) {
                  if (palCtr % PALETTE_FADE_INC_SIZE == (PALETTE_FADE_INC_SIZE - 1)) continue;
                  bool isDifferent = *pCurrent < *pFinal;

                  if (isDifferent) {
                        if ((*pFinal - *pCurrent) < PALETTE_FADE_INC_SIZE) 
                              *pCurrent = *pFinal;
                        else
                              *pCurrent += PALETTE_FADE_INC_SIZE;
                        changed = true;
                  }
            }

            if (changed) {
                  _system.setPalette(_palette->data(), 0, p->numEntries());
                  _system.updateScreen();
                  _system.delayMillis(20);
                  while (events.pollEvent())
                        ;
            }
      } while (changed);
}

// paletteFadeOut
// Fades the screen to black by gradually decreasing the palette colours

void Screen::paletteFadeOut(int numEntries) {
      assert((uint32)numEntries <= _palette->palette()->size());
      Events &events = Events::getReference();
      bool changed;

      do {
            byte *pTemp = _palette->data();
            changed = false;

            for (uint32 palCtr = 0; palCtr < (uint32)(numEntries * PALETTE_FADE_INC_SIZE); ++palCtr, ++pTemp) {
                  if (palCtr % PALETTE_FADE_INC_SIZE == (PALETTE_FADE_INC_SIZE - 1)) 
                        continue;
                  bool isDifferent = *pTemp > 0;
                  if (isDifferent) {
                        if (*pTemp < PALETTE_FADE_INC_SIZE) *pTemp = 0;
                        else *pTemp -= PALETTE_FADE_INC_SIZE;
                        changed = true;
                  }
            }

            if (changed) {
                  _system.setPalette(_palette->data(), 0, numEntries);
                  _system.updateScreen();
                  _system.delayMillis(20);
                  while (events.pollEvent())
                        ;
            }
      } while (changed);
}

void Screen::resetPalette() {
      Palette p(GAME_PALETTE_RESOURCE_ID);
      setPalette(&p);
}

void Screen::empty() {
      _screen->empty();
      update();
}

void Screen::update() {
      _system.copyRectToScreen(screen_raw(), FULL_SCREEN_WIDTH, 0, 0, FULL_SCREEN_WIDTH, FULL_SCREEN_HEIGHT);
      _system.updateScreen();
}

void Screen::updateArea(uint16 x, uint16 y, uint16 w, uint16 h) {
      _system.copyRectToScreen(screen_raw(), FULL_SCREEN_WIDTH, x, y, w, h);
      _system.updateScreen();
}

} // end of namespace Lure

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