From aa03bdb26c736e7d506d656a5529cf6a4e9fe6b4 Mon Sep 17 00:00:00 2001
From: Andrei Karas <akaras@inbox.ru>
Date: Wed, 13 May 2015 21:38:01 +0300
Subject: New stack class in graphics areas stack.

---
 src/render/graphics.cpp | 31 +++++++++++++++++--------------
 src/render/graphics.h   |  5 +++--
 src/resources/mstack.h  |  7 ++++++-
 3 files changed, 26 insertions(+), 17 deletions(-)

(limited to 'src')

diff --git a/src/render/graphics.cpp b/src/render/graphics.cpp
index 17f8a6d2e..4542a33ae 100644
--- a/src/render/graphics.cpp
+++ b/src/render/graphics.cpp
@@ -102,7 +102,7 @@ Graphics::Graphics() :
     mHeight(0),
     mActualWidth(0),
     mActualHeight(0),
-    mClipStack(),
+    mClipStack(1000),
     mWindow(nullptr),
 #ifdef USE_SDL2
     mRenderer(nullptr),
@@ -576,31 +576,36 @@ void Graphics::pushClipArea(const Rect &area)
     // to the stack.
     if (area.width < 0 || area.height < 0)
     {
-        ClipRect carea;
-        mClipStack.push(carea);
+        ClipRect &carea = mClipStack.push();
+        carea.x = 0;
+        carea.y = 0;
+        carea.width = 0;
+        carea.height = 0;
+        carea.xOffset = 0;
+        carea.yOffset = 0;
         return;
     }
 
     if (mClipStack.empty())
     {
-        ClipRect carea;
+        ClipRect &carea = mClipStack.push();
         carea.x = area.x;
         carea.y = area.y;
         carea.width = area.width;
         carea.height = area.height;
         carea.xOffset = area.x;
         carea.yOffset = area.y;
-        mClipStack.push(carea);
         return;
     }
 
     const ClipRect &top = mClipStack.top();
-    ClipRect carea;
-    carea = area;
-    carea.xOffset = top.xOffset + carea.x;
-    carea.yOffset = top.yOffset + carea.y;
-    carea.x += top.xOffset;
-    carea.y += top.yOffset;
+    ClipRect &carea = mClipStack.push();
+    carea.x = area.x + top.xOffset;
+    carea.y = area.y + top.yOffset;
+    carea.width = area.width;
+    carea.height = area.height;
+    carea.xOffset = top.xOffset + area.x;
+    carea.yOffset = top.yOffset + area.y;
 
     // Clamp the pushed clip rectangle.
     if (carea.x < top.x)
@@ -624,8 +629,6 @@ void Graphics::pushClipArea(const Rect &area)
         if (carea.height < 0)
             carea.height = 0;
     }
-
-    mClipStack.push(carea);
 }
 
 void Graphics::popClipArea()
@@ -641,7 +644,7 @@ const ClipRect *Graphics::getCurrentClipArea() const
     if (mClipStack.empty())
         return nullptr;
 
-    return &mClipStack.top();
+    return &mClipStack.topConst();
 }
 
 #ifdef USE_OPENGL
diff --git a/src/render/graphics.h b/src/render/graphics.h
index c803b7746..c43471f66 100644
--- a/src/render/graphics.h
+++ b/src/render/graphics.h
@@ -72,9 +72,10 @@
 #include "enums/render/rendertype.h"
 
 #include "gui/color.h"
-
 #include "gui/cliprect.h"
 
+#include "resources/mstack.h"
+
 #include <SDL_video.h>
 
 #ifdef USE_SDL2
@@ -514,7 +515,7 @@ class Graphics notfinal
         /**
          * Holds the clip area stack.
          */
-        std::stack<ClipRect> mClipStack;
+        MStack<ClipRect> mClipStack;
 
         SDL_Window *mWindow;
 
diff --git a/src/resources/mstack.h b/src/resources/mstack.h
index ba1a58eb2..2a568bc5a 100644
--- a/src/resources/mstack.h
+++ b/src/resources/mstack.h
@@ -78,7 +78,7 @@ struct MStack final
             mPointer --;
     }
 
-    T &top()
+    T &top() const
     {
         return *mPointer;
     }
@@ -93,6 +93,11 @@ struct MStack final
         mPointer = mStack - 1;
     }
 
+    bool empty() const
+    {
+        return mPointer == mStartPointer;
+    }
+
     T *mStack;
 
     size_t mMaxSize;
-- 
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