Allow preservation of alpha channel when loading image resources, which is used

to load alpha blended mouse cursor, which is now drawn instead of using the
system cursor.

5 files changed, 25 insertions, 14 deletions

diff --git a/src/resources/image.cpp b/src/resources/image.cpp
index 15ef6708..f84826bb 100644
--- a/src/resources/image.cpp
+++ b/src/resources/image.cpp
@@ -26,6 +26,7 @@
 #include <iostream>
 #include <SDL_image.h>
 #include "../graphic/graphic.h"
+#include "resourcemanager.h"
 
 Image::Image(SDL_Surface *image):
     image(image)
@@ -37,7 +38,7 @@ Image::~Image()
     unload();
 }
 
-Image* Image::load(const std::string &filePath)
+Image* Image::load(const std::string &filePath, int flags)
 {
 #ifdef __DEBUG
     std::cout << "Image::load(" << filePath << ")\n";
@@ -46,7 +47,13 @@ Image* Image::load(const std::string &filePath)
     SDL_Surface *tmpImage = IMG_Load(filePath.c_str());
     SDL_SetColorKey(tmpImage, SDL_SRCCOLORKEY | SDL_RLEACCEL,
             SDL_MapRGB(tmpImage->format, 255, 0, 255));
-    SDL_Surface *image = SDL_DisplayFormat(tmpImage);
+    SDL_Surface *image = NULL;
+    if (flags & IMG_ALPHA) {
+        image = SDL_DisplayFormatAlpha(tmpImage);
+    }
+    else {
+        image = SDL_DisplayFormat(tmpImage);
+    }
     SDL_FreeSurface(tmpImage);
 
     // Check if the file was opened and return the appropriate value.
diff --git a/src/resources/image.h b/src/resources/image.h
index 1c2b58cf..bed75983 100644
--- a/src/resources/image.h
+++ b/src/resources/image.h
@@ -27,6 +27,11 @@
 #include "resource.h"
 #include <SDL.h>
 
+// This flag causes image alpha channel to be preserved, otherwise masking is
+// used.
+#define IMG_ALPHA  1
+
+
 // Forward declarations
 class SubImage;
 class ScaledImage;
@@ -53,7 +58,7 @@ class Image : public Resource
          * @return <code>true</code> if the image was loaded
          * <code>false</code> otherwise.
          */
-        static Image *load(const std::string &filePath);
+        static Image *load(const std::string &filePath, int flags);
 
         /**
          * Frees the resources created by SDL.
diff --git a/src/resources/resource.h b/src/resources/resource.h
index f1252c12..bd6bfcc5 100644
--- a/src/resources/resource.h
+++ b/src/resources/resource.h
@@ -24,9 +24,6 @@
 #ifndef _TMW_RESOURCE_H
 #define _TMW_RESOURCE_H
 
-#include <string>
-//#include <SDL/SDL.h>
-
 /**
  * A generic reference counted resource object.
  */
diff --git a/src/resources/resourcemanager.cpp b/src/resources/resourcemanager.cpp
index 0d936836..1a2c7a5f 100644
--- a/src/resources/resourcemanager.cpp
+++ b/src/resources/resourcemanager.cpp
@@ -21,9 +21,8 @@
  *  $Id$
  */
 
-#include "../log.h"
-#include "image.h"
 #include "resourcemanager.h"
+#include "../log.h"
 #include <iostream>
 #include <sstream>
 
@@ -71,7 +70,7 @@ ResourceManager::~ResourceManager()
 }
 
 Resource* ResourceManager::get(const E_RESOURCE_TYPE &type,
-        const std::string &idPath)
+        const std::string &idPath, int flags)
 {
     // Check if the id exists, and return the value if it does.
     std::map<std::string, ResourceEntry>::iterator resIter =
@@ -108,7 +107,8 @@ Resource* ResourceManager::get(const E_RESOURCE_TYPE &type,
             break;
         case IMAGE:
             // Attempt to create and load our image object.
-            resource = reinterpret_cast<Resource*>(Image::load(filePath));
+            resource =
+                reinterpret_cast<Resource*>(Image::load(filePath, flags));
             break;
         case SCRIPT:
             warning("Script resource not supported.");
@@ -139,9 +139,9 @@ Resource* ResourceManager::get(const E_RESOURCE_TYPE &type,
     return resource;
 }
 
-Image *ResourceManager::getImage(const std::string &idPath)
+Image *ResourceManager::getImage(const std::string &idPath, int flags)
 {
-    return (Image*)get(IMAGE, idPath);
+    return (Image*)get(IMAGE, idPath, flags);
 }
 
 ResourceManager* ResourceManager::getInstance()
diff --git a/src/resources/resourcemanager.h b/src/resources/resourcemanager.h
index 1b719b41..fe8b2a96 100644
--- a/src/resources/resourcemanager.h
+++ b/src/resources/resourcemanager.h
@@ -27,6 +27,7 @@
 #include <map>
 #include <string>
 #include "resource.h"
+#include "image.h"
 
 /**
  * A resource entry descriptor.
@@ -80,12 +81,13 @@ class ResourceManager
          */
         Resource *get(
                 const E_RESOURCE_TYPE &type,
-                const std::string &idPath);
+                const std::string &idPath,
+                int flags = 0);
 
         /**
          * Convenience wrapper around ResourceManager::create.
          */
-        Image *getImage(const std::string &idPath);
+        Image *getImage(const std::string &idPath, int flags = 0);
 
         /**
          * Returns an instance of the class, creating one if it does not