From a31fce06e41ac33ca6ed12065644b314ceb4bcb3 Mon Sep 17 00:00:00 2001
From: Philipp Sehmisch <crush@themanaworld.org>
Date: Fri, 25 Dec 2009 16:06:38 +0100
Subject: Added support for map background images which work exactly like
 overlays, just that they are drawn before the tiles instead of afterwards.
 Renamed overlays to foregrounds (but kept backward compatibility intact)

---
 src/resources/ambientlayer.cpp | 103 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 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 00000000..92895bc2
--- /dev/null
+++ b/src/resources/ambientlayer.cpp
@@ -0,0 +1,103 @@
+/*
+ *  The Mana World
+ *  Copyright (C) 2004  The Mana World Development Team
+ *
+ *  This file is part of The Mana World.
+ *
+ *  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, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "resources/ambientlayer.h"
+
+#include "resources/image.h"
+#include "resources/resourcemanager.h"
+#include "graphics.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 (keepRatio && !mImage->isAnOpenGLOne()
+        && 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(
+         (int) mImage->getWidth() / defaultScreenWidth * graphics->getWidth(),
+     (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;
+        }
+        else
+            mImage->incRef();
+    }
+    else
+        mImage->incRef();
+}
+
+AmbientLayer::~AmbientLayer()
+{
+    mImage->decRef();
+}
+
+void AmbientLayer::update(int timePassed, float dx, float dy)
+{
+    // Self scrolling of the overlay
+    mPosX -= mSpeedX * timePassed / 10;
+    mPosY -= mSpeedY * timePassed / 10;
+
+    // Parallax scrolling
+    mPosX += dx * mParallax;
+    mPosY += dy * mParallax;
+
+    int imgW = mImage->getWidth();
+    int imgH = mImage->getHeight();
+
+    // 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 *graphics, int x, int y)
+{
+    if (!mImage->isAnOpenGLOne() || !mKeepRatio)
+        graphics->drawImagePattern(mImage,
+            (int) -mPosX, (int) -mPosY, x + (int) mPosX, y + (int) mPosY);
+    else
+        graphics->drawRescaledImagePattern(mImage,
+              (int) -mPosX, (int) -mPosY, x + (int) mPosX, y + (int) mPosY,
+         (int) mImage->getWidth() / defaultScreenWidth * graphics->getWidth(),
+     (int) mImage->getHeight() / defaultScreenHeight * graphics->getHeight());
+
+}
-- 
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