From 413302330666a135389b759139ff9d5b6eb20052 Mon Sep 17 00:00:00 2001
From: Luke Bratch <l_bratch@yahoo.co.uk>
Date: Thu, 25 Nov 2010 20:35:18 +0000
Subject: Add background to Level, add sample background, modify Screen::blit()
 to always blit onto the game window

---
 Level.cpp         |   6 ++++++
 Level.h           |   3 ++-
 Screen.cpp        |   4 ++--
 Screen.h          |   4 ++--
 intensemarcus.cpp |  24 ++++++++++++++++++++++++
 intensemarcus.h   |   6 ++++++
 space.png         | Bin 0 -> 970896 bytes
 7 files changed, 42 insertions(+), 5 deletions(-)
 create mode 100644 intensemarcus.cpp
 create mode 100644 space.png

diff --git a/Level.cpp b/Level.cpp
index 27a77be..0dec3ef 100644
--- a/Level.cpp
+++ b/Level.cpp
@@ -25,6 +25,10 @@ void Level::changeLevel(int levelNo) {
 
     // Checking where the player is for fun/demonstration purposes
     std::cout << "Level::changeLevel(): player is at " << player.getX() << ", " << player.getY() << ".\n";
+
+    // Load background image
+    if (!(background = loadImage("space.png")))
+        std::cout << "Level::changeLevel: Error loading background image.\n";
 }
 
 void Level::move() {
@@ -33,4 +37,6 @@ void Level::move() {
 
 void Level::draw(Screen *screen) {
     //std::cout << "Level::draw(): Drawing into the screen.\n";
+    // Blit background
+    screen->blit(0, 0, background);
 }
diff --git a/Level.h b/Level.h
index a56b734..c65eab9 100644
--- a/Level.h
+++ b/Level.h
@@ -21,7 +21,8 @@ class Level {
         Player player;
 
     private:
-        // Nothing yet!
+        // Background image
+        SDL_Surface *background;
 };
 
 #endif
diff --git a/Screen.cpp b/Screen.cpp
index 5a0b157..1a0e6cb 100644
--- a/Screen.cpp
+++ b/Screen.cpp
@@ -10,14 +10,14 @@ Screen::Screen() {
     SDL_WM_SetCaption("Intense Marcus", NULL);
 }
 
-void Screen::blit(int x, int y, SDL_Surface* src, SDL_Surface* dst, SDL_Rect* clip) {
+void Screen::blit(int x, int y, SDL_Surface* src, SDL_Rect* clip) {
     // Destination position
     SDL_Rect pos;
 
     pos.x = x;
     pos.y = y;
 
-    SDL_BlitSurface(src, clip, dst, &pos);
+    SDL_BlitSurface(src, clip, screen, &pos);
 }
 
 void Screen::flip() {
diff --git a/Screen.h b/Screen.h
index c5672b5..e535f0f 100644
--- a/Screen.h
+++ b/Screen.h
@@ -8,8 +8,8 @@ class Screen {
     public:
         Screen();
 
-        /* blits src onto dst, at position x, y */
-        void blit(int x, int y, SDL_Surface* src, SDL_Surface* dst, SDL_Rect* clip = NULL);
+        /* blits src onto screen, at position x, y */
+        void blit(int x, int y, SDL_Surface* src, SDL_Rect* clip = NULL);
         /* Swap screen buffers */
         void flip();
 
diff --git a/intensemarcus.cpp b/intensemarcus.cpp
new file mode 100644
index 0000000..c866a1a
--- /dev/null
+++ b/intensemarcus.cpp
@@ -0,0 +1,24 @@
+#include "intensemarcus.h"
+
+/* SDL_Surface loads an image from a file, and
+   converts it into the same format as the
+   display, for faster blitting. */
+SDL_Surface *loadImage(std::string filename) {
+    // Image as it is loaded
+    SDL_Surface* raw = NULL;
+
+    // Image converted into same format as display
+    SDL_Surface* image = NULL;
+
+    raw = IMG_Load(filename.c_str());
+
+    if(raw != NULL) {
+        // Convert the image, using the PNG's alpha channel
+        image = SDL_DisplayFormatAlpha(raw);
+
+        // Free raw image
+        SDL_FreeSurface(raw);
+    }
+
+    return image;
+}
diff --git a/intensemarcus.h b/intensemarcus.h
index 3f7d5bf..543eafc 100644
--- a/intensemarcus.h
+++ b/intensemarcus.h
@@ -1,9 +1,15 @@
 #ifndef INTENSEMARCUS_H
 #define INTENSEMARCUS_H
 
+#include "SDL/SDL.h"
+#include "SDL/SDL_image.h"
+#include <string>
+
 const int SCREEN_WIDTH = 800;
 const int SCREEN_HEIGHT = 600;
 const int SCREEN_BPP = 32;
 const int FPS = 30;
 
+SDL_Surface *loadImage(std::string filename);
+
 #endif
diff --git a/space.png b/space.png
new file mode 100644
index 0000000..6305927
Binary files /dev/null and b/space.png differ
-- 
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