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cursorman.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/graphics/cursorman.cpp $
 * $Id: cursorman.cpp 30944 2008-02-23 22:50:18Z sev $
 */

#include "graphics/cursorman.h"

#include "common/system.h"
#include "common/stack.h"

DECLARE_SINGLETON(Graphics::CursorManager);

namespace Graphics {

static bool g_initialized = false;

CursorManager::CursorManager() {
      if (!g_initialized) {
            g_initialized = true;
            _cursorStack.clear();
            _cursorPaletteStack.clear();
      }
}

bool CursorManager::isVisible() {
      if (_cursorStack.empty())
            return false;
      return _cursorStack.top()->_visible;
}

bool CursorManager::showMouse(bool visible) {
      if (_cursorStack.empty())
            return false;

      _cursorStack.top()->_visible = visible;

      // Should work, even if there's just a dummy cursor on the stack.
      return g_system->showMouse(visible);
}

void CursorManager::pushCursor(const byte *buf, uint w, uint h, int hotspotX, int hotspotY, byte keycolor, int targetScale) {
      Cursor *cur = new Cursor(buf, w, h, hotspotX, hotspotY, keycolor, targetScale);

      cur->_visible = isVisible();
      _cursorStack.push(cur);

      if (buf) {
            g_system->setMouseCursor(cur->_data, w, h, hotspotX, hotspotY, keycolor, targetScale);
      }
}

void CursorManager::popCursor() {
      if (_cursorStack.empty())
            return;

      Cursor *cur = _cursorStack.pop();
      delete cur;

      if (!_cursorStack.empty()) {
            cur = _cursorStack.top();
            g_system->setMouseCursor(cur->_data, cur->_width, cur->_height, cur->_hotspotX, cur->_hotspotY, cur->_keycolor, cur->_targetScale);
      }

      g_system->showMouse(isVisible());
}

void CursorManager::replaceCursor(const byte *buf, uint w, uint h, int hotspotX, int hotspotY, byte keycolor, int targetScale) {
      if (_cursorStack.empty()) {
            pushCursor(buf, w, h, hotspotX, hotspotY, keycolor, targetScale);
            return;
      }

      Cursor *cur = _cursorStack.top();
      uint size = w * h;

      if (cur->_size < size) {
            delete[] cur->_data;
            cur->_data = new byte[size];
            cur->_size = size;
      }

      if (buf && cur->_data)
            memcpy(cur->_data, buf, size);

      cur->_width = w;
      cur->_height = h;
      cur->_hotspotX = hotspotX;
      cur->_hotspotY = hotspotY;
      cur->_keycolor = keycolor;
      cur->_targetScale = targetScale;

      g_system->setMouseCursor(cur->_data, w, h, hotspotX, hotspotY, keycolor, targetScale);
}

void CursorManager::disableCursorPalette(bool disable) {
      if (!g_system->hasFeature(OSystem::kFeatureCursorHasPalette))
            return;

      if (_cursorPaletteStack.empty())
            return;

      Palette *pal = _cursorPaletteStack.top();
      pal->_disabled = disable;

      g_system->disableCursorPalette(true);
}

void CursorManager::pushCursorPalette(const byte *colors, uint start, uint num) {
      if (!g_system->hasFeature(OSystem::kFeatureCursorHasPalette))
            return;

      Palette *pal = new Palette(colors, start, num);
      _cursorPaletteStack.push(pal);

      if (num)
            g_system->setCursorPalette(colors, start, num);
      else
            g_system->disableCursorPalette(true);
}

void CursorManager::popCursorPalette() {
      if (!g_system->hasFeature(OSystem::kFeatureCursorHasPalette))
            return;

      if (_cursorPaletteStack.empty())
            return;

      Palette *pal = _cursorPaletteStack.pop();
      delete pal;

      if (_cursorPaletteStack.empty()) {
            g_system->disableCursorPalette(true);
            return;
      }

      pal = _cursorPaletteStack.top();

      if (pal->_num && !pal->_disabled)
            g_system->setCursorPalette(pal->_data, pal->_start, pal->_num);
      else
            g_system->disableCursorPalette(true);
}

void CursorManager::replaceCursorPalette(const byte *colors, uint start, uint num) {
      if (!g_system->hasFeature(OSystem::kFeatureCursorHasPalette))
            return;

      if (_cursorPaletteStack.empty()) {
            pushCursorPalette(colors, start, num);
            return;
      }

      Palette *pal = _cursorPaletteStack.top();
      uint size = 4 * num;

      if (pal->_size < size) {
            // Could not re-use the old buffer. Create a new one.
            delete[] pal->_data;
            pal->_data = new byte[size];
            pal->_size = size;
      }

      pal->_start = start;
      pal->_num = num;

      if (num) {
            memcpy(pal->_data, colors, 4 * num);
            g_system->setCursorPalette(pal->_data, pal->_start, pal->_num);
      } else {
            g_system->disableCursorPalette(true);
      }
}

} // End of namespace Graphics

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