allow load and use mask in ambient layers.

default layer mask is 1.

4 files changed, 41 insertions, 13 deletions

diff --git a/src/map.cpp b/src/map.cpp
index 3c0c9f4a4..5188da985 100644
--- a/src/map.cpp
+++ b/src/map.cpp
@@ -281,11 +281,15 @@ void Map::initializeAmbientLayers()
         Image *const img = resman->getImage(getProperty(name + "image"));
         if (img)
         {
+            int mask = atoi(getProperty(name + "mask").c_str());
+            if (!mask)
+                mask = 1;
             mForegrounds.push_back(new AmbientLayer(img,
                 getFloatProperty(name + "parallax"),
                 getFloatProperty(name + "scrollX"),
                 getFloatProperty(name + "scrollY"),
-                getBoolProperty(name + "keepratio")));
+                getBoolProperty(name + "keepratio"),
+                mask));
 
             // The AmbientLayer takes control over the image.
             img->decRef();
@@ -301,11 +305,15 @@ void Map::initializeAmbientLayers()
 
         if (img)
         {
+            int mask = atoi(getProperty(name + "mask").c_str());
+            if (!mask)
+                mask = 1;
             mBackgrounds.push_back(new AmbientLayer(img,
                 getFloatProperty(name + "parallax"),
                 getFloatProperty(name + "scrollX"),
                 getFloatProperty(name + "scrollY"),
-                getBoolProperty(name + "keepratio")));
+                getBoolProperty(name + "keepratio"),
+                mask));
 
             // The AmbientLayer takes control over the image.
             img->decRef();
@@ -603,11 +611,19 @@ void Map::updateAmbientLayers(const float scrollX, const float scrollY)
 
     // need check mask to update or not to update
 
-    FOR_EACH (AmbientLayerVectorCIter, i, mBackgrounds)
-        (*i)->update(timePassed, dx, dy);
+    FOR_EACH (AmbientLayerVectorIter, i, mBackgrounds)
+    {
+        AmbientLayer *const layer = *i;
+        if (layer && (layer->mMask & mMask))
+            layer->update(timePassed, dx, dy);
+    }
 
-    FOR_EACH (AmbientLayerVectorCIter, i, mForegrounds)
-        (*i)->update(timePassed, dx, dy);
+    FOR_EACH (AmbientLayerVectorIter, i, mForegrounds)
+    {
+        AmbientLayer *const layer = *i;
+        if (layer && (layer->mMask & mMask))
+            layer->update(timePassed, dx, dy);
+    }
 
     mLastAScrollX = scrollX;
     mLastAScrollY = scrollY;
@@ -643,9 +659,10 @@ void Map::drawAmbientLayers(Graphics *const graphics, const LayerType type,
     // Draw overlays
     FOR_EACHP (AmbientLayerVectorCIter, i, layers)
     {
+        const AmbientLayer *const layer = *i;
         // need check mask to draw or not to draw
-        if (*i)
-            (*i)->draw(graphics, graphics->mWidth, graphics->mHeight);
+        if (layer && (layer->mMask & mMask))
+            (layer)->draw(graphics, graphics->mWidth, graphics->mHeight);
 
         // Detail 1: only one overlay, higher: all overlays
         if (detail == 1)
diff --git a/src/map.h b/src/map.h
index 49662c919..068a41458 100644
--- a/src/map.h
+++ b/src/map.h
@@ -57,6 +57,7 @@ typedef TilePairVector::const_iterator TilePairVectorCIter;
 
 typedef std::vector<AmbientLayer*> AmbientLayerVector;
 typedef AmbientLayerVector::const_iterator AmbientLayerVectorCIter;
+typedef AmbientLayerVector::iterator AmbientLayerVectorIter;
 
 static const int mapTileSize = 32;
 
diff --git a/src/resources/ambientlayer.cpp b/src/resources/ambientlayer.cpp
index 6814b0365..cc9ebdaec 100644
--- a/src/resources/ambientlayer.cpp
+++ b/src/resources/ambientlayer.cpp
@@ -21,6 +21,8 @@
 
 #include "resources/ambientlayer.h"
 
+#include "map.h"
+
 #include "render/graphics.h"
 
 #include "resources/image.h"
@@ -31,10 +33,14 @@
 
 AmbientLayer::AmbientLayer(Image *const img, const float parallax,
                            const float speedX, const float speedY,
-                           const bool keepRatio) :
-    mImage(img), mParallax(parallax),
-    mPosX(0), mPosY(0),
-    mSpeedX(speedX), mSpeedY(speedY),
+                           const bool keepRatio, int mask) :
+    mImage(img),
+    mParallax(parallax),
+    mPosX(0),
+    mPosY(0),
+    mSpeedX(speedX),
+    mSpeedY(speedY),
+    mMask(mask),
     mKeepRatio(keepRatio)
 {
     if (!mImage)
diff --git a/src/resources/ambientlayer.h b/src/resources/ambientlayer.h
index 18bbfb69a..1ab54fd9f 100644
--- a/src/resources/ambientlayer.h
+++ b/src/resources/ambientlayer.h
@@ -26,10 +26,13 @@
 
 class Graphics;
 class Image;
+class Map;
 
 class AmbientLayer final
 {
     public:
+        friend Map;
+
         /**
          * Constructor.
          *
@@ -42,7 +45,7 @@ class AmbientLayer final
          */
         AmbientLayer(Image *const img, const float parallax,
                      const float speedX, const float speedY,
-                     const bool keepRatio = false);
+                     const bool keepRatio, int mask);
 
         A_DELETE_COPY(AmbientLayer)
 
@@ -59,6 +62,7 @@ class AmbientLayer final
         float mPosY;             /**< Current layer Y position. */
         float mSpeedX;           /**< Scrolling speed in X direction. */
         float mSpeedY;           /**< Scrolling speed in Y direction. */
+        int mMask;
         bool mKeepRatio;         /**< Keep overlay ratio on every resolution */
 };