savePNG method for Image

src/framework/graphics/image.cpp

@@ -24,6 +24,7 @@
 #include "image.h"
 
 #include <framework/core/resourcemanager.h>
+#include <framework/core/filestream.h>
 #include <framework/graphics/apngloader.h>
 
 Image::Image(const Size& size, int bpp, uint8 *pixels)
@@ -62,6 +63,20 @@ ImagePtr Image::loadPNG(const std::string& file)
     return image;
 }
 
+void Image::savePNG(const std::string& fileName)
+{
+    FileStreamPtr fin = g_resources.createFile(fileName);
+    if(!fin)
+        stdext::throw_exception(stdext::format("failed to open file '%s' for write", fileName));
+
+    fin->cache();
+    std::stringstream data;
+    save_png(data, m_size.width(), m_size.height(), 4, (unsigned char*)getPixelData());
+    fin->write(data.str().c_str(), data.str().length());
+    fin->flush();
+    fin->close();
+}
+
 void Image::overwriteMask(const Color& maskedColor, const Color& insideColor, const Color& outsideColor)
 {
     assert(m_bpp == 4);
@@ -252,4 +267,4 @@ void Texture::generateSoftwareMipmaps(std::vector<uint8> inPixels)
         setupFilters();
     }
 }
-*/
+*/