From 3eeae12c498d1a4dbe969462d2ba841f77ee3ccb Mon Sep 17 00:00:00 2001
From: Andrei Karas <akaras@inbox.ru>
Date: Sun, 2 Jan 2011 01:48:38 +0200
Subject: Initial commit.

This code based on mana client http://www.gitorious.org/mana/mana
and my private repository.
---
 src/resources/ambientlayer.cpp | 126 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 src/resources/ambientlayer.cpp

(limited to 'src/resources/ambientlayer.cpp')

diff --git a/src/resources/ambientlayer.cpp b/src/resources/ambientlayer.cpp
new file mode 100644
index 000000000..d80f380dd
--- /dev/null
+++ b/src/resources/ambientlayer.cpp
@@ -0,0 +1,126 @@
+/*
+ *  The Mana Client
+ *  Copyright (C) 2009-2010  The Mana Developers
+ *
+ *  This file is part of The Mana 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 "graphics.h"
+
+#include "resources/image.h"
+#include "resources/resourcemanager.h"
+
+AmbientLayer::AmbientLayer(Image *img, float parallax,
+                           float speedX, float speedY, bool keepRatio):
+    mImage(img), mParallax(parallax),
+    mPosX(0), mPosY(0),
+    mSpeedX(speedX), mSpeedY(speedY),
+    mKeepRatio(keepRatio)
+{
+    if (!mImage)
+        return;
+
+    if (keepRatio && !mImage->useOpenGL()
+        /*&& defaultScreenWidth != 0
+        && defaultScreenHeight != 0*/
+        && graphics->getWidth() != defaultScreenWidth
+        && graphics->getHeight() != defaultScreenHeight)
+    {
+        // Rescale the overlay to keep the ratio as if we were on
+        // the default resolution...
+        Image *rescaledOverlay = mImage->SDLgetScaledImage(
+                static_cast<int>(mImage->getWidth()) / defaultScreenWidth
+                * graphics->getWidth(), static_cast<int>(mImage->getHeight())
+                / defaultScreenHeight * graphics->getHeight());
+
+        if (rescaledOverlay)
+        {
+            // Replace the resource with the new one...
+            std::string idPath = mImage->getIdPath() + "_rescaled";
+            ResourceManager::getInstance()->addResource(
+                idPath, rescaledOverlay);
+            mImage = rescaledOverlay;
+            rescaledOverlay->incRef();
+        }
+        else
+        {
+            mImage->incRef();
+        }
+    }
+    else
+    {
+        mImage->incRef();
+    }
+}
+
+AmbientLayer::~AmbientLayer()
+{
+    if (mImage)
+        mImage->decRef();
+}
+
+void AmbientLayer::update(int timePassed, float dx, float dy)
+{
+    if (!mImage)
+        return;
+
+    // Self scrolling of the overlay
+    mPosX -= mSpeedX * static_cast<float>(timePassed) / 10;
+    mPosY -= mSpeedY * static_cast<float>(timePassed) / 10;
+
+    // Parallax scrolling
+    mPosX += dx * mParallax;
+    mPosY += dy * mParallax;
+
+    int imgW = mImage->getWidth();
+    int imgH = mImage->getHeight();
+
+    // Wrap values
+    while (mPosX > imgW)
+        mPosX -= static_cast<float>(imgW);
+    while (mPosX < 0)
+        mPosX += static_cast<float>(imgW);
+
+    while (mPosY > imgH)
+        mPosY -= static_cast<float>(imgH);
+    while (mPosY < 0)
+        mPosY += static_cast<float>(imgH);
+}
+
+void AmbientLayer::draw(Graphics *graphics, int x, int y)
+{
+    if (!mImage)
+        return;
+
+    if (!mImage->useOpenGL() || !mKeepRatio)
+    {
+        graphics->drawImagePattern(mImage, static_cast<int>(-mPosX),
+                static_cast<int>(-mPosY), x + static_cast<int>(mPosX),
+                y + static_cast<int>(mPosY));
+    }
+    else
+    {
+        graphics->drawRescaledImagePattern(mImage, static_cast<int>(-mPosX),
+                static_cast<int>(-mPosY), x + static_cast<int>(mPosX),
+                y + static_cast<int>(mPosY),
+                static_cast<int>(mImage->getWidth())
+                / defaultScreenWidth * graphics->getWidth(),
+                static_cast<int>(mImage->getHeight()) / defaultScreenHeight
+                * graphics->getHeight());
+    }
+}
-- 
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