ambientlayer.cpp

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/*
 * The ManaPlus Client
 * Copyright (C) 2009-2010 The Mana Developers
 * Copyright (C) 2011-2019 The ManaPlus Developers
 * Copyright (C) 2019-2021 Andrei Karas
 *
 * This file is part of The ManaPlus Client.
 *
 * 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
 * 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, see <http://www.gnu.org/licenses/>.
 */
 
#include "resources/ambientlayer.h"
 
#include "const/render/graphics.h"
 
#include "render/graphics.h"
 
#include "resources/imagehelper.h"
 
#include "resources/image/image.h"
 
#include "resources/loaders/rescaledloader.h"
 
#include "debug.h"
 
AmbientLayer::AmbientLayer(const std::string &name,
 Image *const img,
 const float parallaxX,
 const float parallaxY,
 const float posX,
 const float posY,
 const float speedX,
 const float speedY,
 const bool keepRatio,
 const int mask) :
 MemoryCounter(),
 mName(name),
 mImage(img),
 mParallaxX(parallaxX),
 mParallaxY(parallaxY),
 mPosX(posX),
 mPosY(posY),
 mSpeedX(speedX),
 mSpeedY(speedY),
 mMask(mask),
 mKeepRatio(keepRatio)
{
 if (mImage == nullptr)
 return;
 
 if (keepRatio &&
 imageHelper->useOpenGL() == RENDER_SOFTWARE)
 {
 const int width = mainGraphics->mWidth;
 const int height = mainGraphics->mHeight;
 if (width != defaultScreenWidth && height != defaultScreenHeight)
 {
 // Rescale the overlay to keep the ratio as if we were on
 // the default resolution...
 Image *const rescaledOverlay = Loader::getRescaled(
 mImage,
 CAST_S32(mImage->mBounds.w) /
 defaultScreenWidth * width,
 CAST_S32(mImage->mBounds.h) /
 defaultScreenHeight * height);
 
 if (rescaledOverlay != nullptr)
 mImage = rescaledOverlay;
 else
 mImage->incRef();
 return;
 }
 }
 mImage->incRef();
}
 
AmbientLayer::~AmbientLayer()
{
 if (mImage != nullptr)
 {
 mImage->decRef();
 mImage = nullptr;
 }
}
 
void AmbientLayer::update(const int timePassed, const float dx, const float dy)
{
 if (mImage == nullptr)
 return;
 
 const float time = static_cast<float>(timePassed) / 10;
 // Self scrolling of the overlay
 mPosX -= mSpeedX * time;
 mPosY -= mSpeedY * time;
 
 // Parallax scrolling
 mPosX += dx * mParallaxX;
 mPosY += dy * mParallaxY;
 
 const SDL_Rect &rect = mImage->mBounds;
 const float imgW = static_cast<float>(rect.w);
 const float imgH = static_cast<float>(rect.h);
 
 // Wrap values
 while (mPosX > imgW)
 mPosX -= imgW;
 while (mPosX < 0)
 mPosX += imgW;
 
 while (mPosY > imgH)
 mPosY -= imgH;
 while (mPosY < 0)
 mPosY += imgH;
}
 
void AmbientLayer::draw(Graphics *const graphics, const int x,
 const int y) const
{
 if (mImage == nullptr)
 return;
 
 if (imageHelper->useOpenGL() == RENDER_SOFTWARE ||
 !mKeepRatio)
 {
 graphics->drawPattern(mImage, CAST_S32(-mPosX),
 CAST_S32(-mPosY), x + CAST_S32(mPosX),
 y + CAST_S32(mPosY));
 }
 else
 {
 graphics->drawRescaledPattern(mImage, CAST_S32(-mPosX),
 CAST_S32(-mPosY), x + CAST_S32(mPosX),
 y + CAST_S32(mPosY),
 CAST_S32(mImage->mBounds.w)
 / defaultScreenWidth * graphics->mWidth,
 CAST_S32(mImage->mBounds.h) / defaultScreenHeight
 * graphics->mHeight);
 }
}
 
int AmbientLayer::calcMemoryLocal() const
{
 return static_cast<int>(sizeof(AmbientLayer) +
 mName.capacity());
}