File indexing completed on 2025-03-09 03:52:07

 /* ============================================================
  *
  * This file is a part of digiKam project
  * https://www.digikam.org
  *
  * Date        : 2007-11-14
  * Description : a presentation tool.
  *
  * SPDX-FileCopyrightText: 2007-2008 by Valerio Fuoglio <valerio dot fuoglio at gmail dot com>
  * SPDX-FileCopyrightText: 2012-2024 by Gilles Caulier <caulier dot gilles at gmail dot com>
  *
  * Parts of this code are based on smoothslidesaver by Carsten Weinhold
  * <carsten dot weinhold at gmx dot de>
  *
  * SPDX-License-Identifier: GPL-2.0-or-later
  *
  * ============================================================ */
 
 #include "kbeffect.h"
 
 // Qt includes
 
 #include <QRandomGenerator>
 
 // Local includes
 
 #include "presentationkb.h"
 #include "presentationkb_p.h"
 
 namespace DigikamGenericPresentationPlugin
 {
 
 // -------------------------------------------------------------------------
 
 int KBEffect::m_numKBEffectRepeated = 0;
 
 // -------------------------------------------------------------------------
 
 KBEffect::KBEffect(PresentationKB* const parent, bool needFadeIn)
     : m_needFadeIn (needFadeIn),
       m_slideWidget(parent)
 {
     m_img[0] = nullptr;
     m_img[1] = nullptr;
 }
 
 void KBEffect::setupNewImage(int img)
 {
     m_slideWidget->setupNewImage(img);
 }
 
 void KBEffect::swapImages()
 {
     m_slideWidget->swapImages();
 }
 
 KBImage* KBEffect::image(int img) const
 {
     Q_ASSERT ((img >= 0) && (img < 2));
 
     return m_slideWidget->d->image[img];
 }
 
 KBEffect::Type KBEffect::chooseKBEffect(KBEffect::Type oldType)
 {
     KBEffect::Type type;
 
     do
     {
         type = (QRandomGenerator::global()->bounded(2U) == 0) ? KBEffect::Fade : KBEffect::Blend;
     }
     while ((type == oldType) && (m_numKBEffectRepeated >= 1));
 
     if (type == oldType)
     {
         m_numKBEffectRepeated++;
     }
     else
     {
         m_numKBEffectRepeated = 0;
     }
 
     return type;
 }
 
 // -------------------------------------------------------------------------
 
 FadeKBEffect::FadeKBEffect(PresentationKB* const parent, bool needFadeIn)
     : KBEffect(parent, needFadeIn)
 {
     m_img[0] = image(0);
 }
 
 FadeKBEffect::~FadeKBEffect()
 {
 }
 
 bool FadeKBEffect::done()
 {
     if (m_img[0]->m_pos >= 1.0)
     {
         setupNewImage(0);
 
         return true;
     }
 
     return false;
 }
 
 void FadeKBEffect::advanceTime(float step)
 {
     m_img[0]->m_pos += step;
 
     if (m_img[0]->m_pos >= 1.0)
     {
         m_img[0]->m_pos = 1.0;
     }
 
     if      (m_needFadeIn && (m_img[0]->m_pos < 0.1))
     {
         m_img[0]->m_opacity = m_img[0]->m_pos * 10;
     }
     else if (m_img[0]->m_pos > 0.9)
     {
         m_img[0]->m_opacity = (1.0 - m_img[0]->m_pos) * 10;
     }
     else
     {
         m_img[0]->m_opacity = 1.0;
     }
 }
 
 // -------------------------------------------------------------------------
 
 BlendKBEffect::BlendKBEffect(PresentationKB* const parent, bool needFadeIn)
     : KBEffect(parent, needFadeIn)
 {
     m_img[0] = image(0);
     m_img[1] = nullptr;
 }
 
 BlendKBEffect::~BlendKBEffect()
 {
 }
 
 bool BlendKBEffect::done()
 {
     if (m_img[0]->m_pos >= 1.0)
     {
         m_img[0]->m_paint = false;
         swapImages();
 
         return true;
     }
 
     return false;
 }
 
 void BlendKBEffect::advanceTime(float step)
 {
     m_img[0]->m_pos += step;
 
     if (m_img[0]->m_pos >= 1.0)
     {
         m_img[0]->m_pos = 1.0;
     }
 
     if (m_img[1])
     {
         m_img[1]->m_pos += step;
     }
 
     if      (m_needFadeIn && (m_img[0]->m_pos < 0.1))
     {
         m_img[0]->m_opacity = m_img[0]->m_pos * 10;
     }
     else if (m_img[0]->m_pos > 0.9)
     {
         m_img[0]->m_opacity = (1.0 - m_img[0]->m_pos) * 10;
 
         if (m_img[1] == nullptr)
         {
             setupNewImage(1);
             m_img[1] = image(1);
             m_img[1]->m_opacity = 1.0;
         }
     }
     else
     {
         m_img[0]->m_opacity = 1.0;
     }
 }
 
 } // namespace DigikamGenericPresentationPlugin