2 files changed, 32 insertions, 0 deletions
diff --git a/src/common/image.cpp b/src/common/image.cpp
index db14797..fd55217 100644
--- a/src/common/image.cpp
+++ b/src/common/image.cpp
@@ -17,6 +17,8 @@
 
 #include "common/image.h"
 
+#include "math/func.h"
+
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
@@ -200,6 +202,33 @@ void CImage::Fill(Gfx::IntColor color)
 }
 
 /**
+ * Image must be valid.
+ *
+ * The dimensions are increased to nearest even power of two values.
+ * If image is already in power-of-two format, nothing is done.
+ */
+void CImage::PadToNearestPowerOfTwo()
+{
+    assert(m_data != nullptr);
+
+    if (Math::IsPowerOfTwo(m_data->surface->w) && Math::IsPowerOfTwo(m_data->surface->h))
+        return;
+
+    int w = Math::NextPowerOfTwo(m_data->surface->w);
+    int h = Math::NextPowerOfTwo(m_data->surface->h);
+
+    m_data->surface->flags &= (~SDL_SRCALPHA);
+    SDL_Surface* resizedSurface = SDL_CreateRGBSurface(0, w, h, 32, 0x00ff0000, 0x0000ff00,
+                                                       0x000000ff, 0xff000000);
+    assert(resizedSurface != NULL);
+    SDL_BlitSurface(m_data->surface, NULL, resizedSurface, NULL);
+
+    SDL_FreeSurface(m_data->surface);
+
+    m_data->surface = resizedSurface;
+}
+
+/**
  * Image must be valid and pixel coords in valid range.
  *
  * \param pixel pixel coords (range x: 0..width-1 y: 0..height-1)
diff --git a/src/common/image.h b/src/common/image.h
index d9da75b..f0b50a3 100644
--- a/src/common/image.h
+++ b/src/common/image.h
@@ -94,6 +94,9 @@ public:
     //! Returns the precise color at given pixel
     Gfx::IntColor GetPixelInt(Math::IntPoint pixel);
 
+    //! Pads the image to nearest power of 2 dimensions
+    void PadToNearestPowerOfTwo();
+
     //! Loads an image from the specified file
     bool Load(const std::string &fileName);