GHOST_DisplayManager.cpp

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/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * 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.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include "GHOST_DisplayManager.h"
#include "GHOST_Debug.h"


GHOST_DisplayManager::GHOST_DisplayManager(
    void)
: m_settingsInitialized(false)
{
}


GHOST_DisplayManager::~GHOST_DisplayManager(void)
{
}


GHOST_TSuccess
GHOST_DisplayManager::initialize(
    void)
{
    GHOST_TSuccess success;
    if (!m_settingsInitialized) {
        success = initializeSettings();
        m_settingsInitialized = true;
    }
    else {
        success = GHOST_kSuccess;
    }
    return success;
}


GHOST_TSuccess
GHOST_DisplayManager::getNumDisplays(
    GHOST_TUns8& /*numDisplays*/) const
{
    // Don't know if we have a display...
    return GHOST_kFailure;
}


GHOST_TSuccess
GHOST_DisplayManager::getNumDisplaySettings(
    GHOST_TUns8 display, 
    GHOST_TInt32& numSettings) const
{
    GHOST_TSuccess success;

    GHOST_ASSERT(m_settingsInitialized, "GHOST_DisplayManager::getNumDisplaySettings(): m_settingsInitialized=false");
    GHOST_TUns8 numDisplays;
    success = getNumDisplays(numDisplays);
    if (success == GHOST_kSuccess) {
        if (display < numDisplays) {
            numSettings = m_settings[display].size();
        }
        else {
            success = GHOST_kFailure;
        }
    }
    return success;
}


GHOST_TSuccess
GHOST_DisplayManager::getDisplaySetting(
    GHOST_TUns8 display, 
    GHOST_TInt32 index, 
    GHOST_DisplaySetting& setting) const
{
    GHOST_TSuccess success;

    GHOST_ASSERT(m_settingsInitialized, "GHOST_DisplayManager::getNumDisplaySettings(): m_settingsInitialized=false");
    GHOST_TUns8 numDisplays;
    success = getNumDisplays(numDisplays);
    if (success == GHOST_kSuccess) {
        if (display < numDisplays && ((GHOST_TUns8)index < m_settings[display].size())) {
            setting = m_settings[display][index];
        }
        else {
            success = GHOST_kFailure;
        }
    }
    return success;
}


GHOST_TSuccess
GHOST_DisplayManager::getCurrentDisplaySetting(
    GHOST_TUns8 /*display*/,
    GHOST_DisplaySetting& /*setting*/) const
{
    return GHOST_kFailure;
}


GHOST_TSuccess
GHOST_DisplayManager::setCurrentDisplaySetting(
    GHOST_TUns8 /*display*/,
    const GHOST_DisplaySetting& /*setting*/)
{
    return GHOST_kFailure;
}


GHOST_TSuccess
GHOST_DisplayManager::findMatch(
    GHOST_TUns8 display, 
    const GHOST_DisplaySetting& setting, 
    GHOST_DisplaySetting& match) const
{
    GHOST_TSuccess success = GHOST_kSuccess;
    GHOST_ASSERT(m_settingsInitialized, "GHOST_DisplayManager::findMatch(): m_settingsInitialized=false");

    int criteria[4] = { setting.xPixels, setting.yPixels, setting.bpp, setting.frequency };
    int capabilities[4];
    double field, score;
    double best = 1e12; // A big number
    int found = 0;

    // Look at all the display modes
    for (int i = 0; (i < (int)m_settings[display].size()); i++) {
        // Store the capabilities of the display device
        capabilities[0] = m_settings[display][i].xPixels;
        capabilities[1] = m_settings[display][i].yPixels;
        capabilities[2] = m_settings[display][i].bpp;
        capabilities[3] = m_settings[display][i].frequency;

        // Match against all the fields of the display settings
        score = 0;
        for (int j = 0; j < 4; j++) {
            field = capabilities[j] - criteria[j];
            score += field * field;
        }

        if (score < best) {
            found = i;
            best = score;
        }
    }
    
    match = m_settings[display][found];
    
    GHOST_PRINT("GHOST_DisplayManager::findMatch(): settings of match:\n");
    GHOST_PRINT("  setting.xPixels=" << match.xPixels << "\n");
    GHOST_PRINT("  setting.yPixels=" << match.yPixels << "\n");
    GHOST_PRINT("  setting.bpp=" << match.bpp << "\n");
    GHOST_PRINT("  setting.frequency=" << match.frequency << "\n");

    return success;
}


GHOST_TSuccess
GHOST_DisplayManager::initializeSettings(
    void)
{
    GHOST_TUns8 numDisplays;
    GHOST_TSuccess success = getNumDisplays(numDisplays);
    if (success == GHOST_kSuccess) {
        for (GHOST_TUns8 display = 0; (display < numDisplays) && (success == GHOST_kSuccess); display++) {
            GHOST_DisplaySettings displaySettings;
            m_settings.push_back(displaySettings);
            GHOST_TInt32 numSettings;
            success = getNumDisplaySettings(display, numSettings);
            if (success == GHOST_kSuccess) {
                GHOST_TInt32 index;
                GHOST_DisplaySetting setting;
                for (index = 0; (index < numSettings) && (success == GHOST_kSuccess); index++) {
                    success = getDisplaySetting(display, index, setting);
                    m_settings[display].push_back(setting);
                }
            }
            else {
                break;
            }
        }
    }
    return success;
}