unique_ptr based management for SDL_Surfaces

Makefile

@@ -2,7 +2,7 @@ CXX=g++
 CXXOPTS=-O2 -ggdb -Wall -Wextra -pedantic -Wno-unused-function -Wno-unused-parameter -Wno-sign-compare -std=c++14 -flto
 LDOPTS=
 LIBS=-lglbinding -lSDL2 -lSDL2_image -lobj -lSDL2_ttf -lprotobuf
-CXXSRCS=main.cc objectParser.cc shaders.cc Object.cc VBOManager.cc texture.cc font.cc Overlay.cc
+CXXSRCS=main.cc objectParser.cc shaders.cc Object.cc VBOManager.cc texture.cc font.cc Overlay.cc TextWidget.cc
 BINIFY_SRCS=binifyObj.cc objectParser.cc object.pb.cc
 OBJS=$(addprefix objs/,$(CXXSRCS:.cc=.o))
 BINIFY_OBJS=$(addprefix objs/,$(BINIFY_SRCS:.cc=.o))

common.hh

@@ -5,6 +5,7 @@
 #include <cstring>
 #include <cstdio>
 #include <cerrno>
+#include <memory>
 
 #include <glbinding/gl/gl.h>
 
@@ -136,4 +137,13 @@ enum class VAFormats {
     VertexNormalTexcoord
     };
 
+struct SDLSurfaceDeleter {
+  void operator()(SDL_Surface* ptr) const
+  {
+    SDL_FreeSurface(ptr);
+  }
+};
+
+using SDLSurfaceUPtr = std::unique_ptr<SDL_Surface, SDLSurfaceDeleter>;
+
 #endif

font.cc

@@ -14,28 +14,45 @@ Font::Font(std::string const& filename, unsigned ptsize)
     throw TTFException{};
 }
 
+Font::Font(Font&& move)
+  : font_(move.font_)
+{
+  move.font_ = nullptr;
+}
+
+Font& Font::operator=(Font&& move)
+{
+  if (font_)
+    TTF_CloseFont(font_);
+  font_ = move.font_;
+  move.font_ = nullptr;
+
+  return *this;
+}
+
 Font::~Font()
 {
   if (font_)
     TTF_CloseFont(font_);
 }
 
-Texture2D Font::render(std::string const& text, bool fast) const {
-  SDL_Surface *surf;
+Texture2D Font::render(std::string const& text, bool fast) const
+{
+  SDLSurfaceUPtr surf;
   if (fast)
-    surf = TTF_RenderUTF8_Solid(font_, text.c_str(), SDL_Color{255, 255, 255, 255});
+    surf.reset(TTF_RenderUTF8_Solid(font_, text.c_str(), SDL_Color{255, 255, 255, 255}));
   else
-    surf = TTF_RenderUTF8_Blended(font_, text.c_str(), SDL_Color{255, 255, 255, 255});
+    surf.reset(TTF_RenderUTF8_Blended(font_, text.c_str(), SDL_Color{255, 255, 255, 255}));
   
   if (!surf)
     throw TTFException{};
   
-  try {
-    Texture2D ret{surf};
-    SDL_FreeSurface(surf);
+  Texture2D ret{surf.get()};
+
   return ret;
-  } catch(...) {
-    SDL_FreeSurface(surf);
-    throw;
 }
+
+TTF_Font* Font::getFont() const
+{
+  return font_;
 }

font.hh

@@ -10,14 +10,17 @@ class Texture2D;
 class Font {
 public:
   Font(std::string const& filename, unsigned ptsize);
+  Font(Font&& move);
   Font(Font const& copy) = delete;
 
+  Font& operator=(Font&& move);
   Font& operator=(Font const& copy) = delete;
   
   ~Font();
 
   Texture2D render(std::string const& text, bool fast = false) const;
 
+  TTF_Font* getFont() const;
 private:
   TTF_Font* font_;
 };

texture.cc

@@ -101,6 +101,10 @@ void TextureCubeMap::bind() const
   glBindTexture(GL_TEXTURE_CUBE_MAP, _texID);
 }
 
+Texture2D::Texture2D()
+  : texID_(0), width_(0), height_(0), alpha_(false)
+{
+}
 
 Texture2D::Texture2D(unsigned width, unsigned height, bool alpha)
   : texID_(0), width_(width), height_(height), alpha_(alpha)
@@ -111,7 +115,8 @@ Texture2D::Texture2D(unsigned width, unsigned height, bool alpha)
 Texture2D::Texture2D(std::string const& file)
   : texID_(0), width_(0), height_(0), alpha_(false)
 {
-  SDL_Surface *surf = IMG_Load(file.c_str());
+  SDLSurfaceUPtr surf(IMG_Load(file.c_str()));
+  
   if (!surf)
     throw SDLException();
 
@@ -122,14 +127,11 @@ Texture2D::Texture2D(std::string const& file)
   }
 
   try {
-    copyFromSurface(surf);
+    copyFromSurface(surf.get());
   } catch (...) {
     glDeleteTextures(1, &texID_);
-    SDL_FreeSurface(surf);
     throw;
   }
-  
-  SDL_FreeSurface(surf);
 }
 
 Texture2D::Texture2D(SDL_Surface *surface)
@@ -174,11 +176,13 @@ Texture2D::~Texture2D()
 
 void Texture2D::bind() const
 {
+  assert(texID_ != 0);
   glBindTexture(GL_TEXTURE_2D, texID_);
 }
 
 void Texture2D::copyFromSurface(SDL_Surface *src)
 {
+  SDLSurfaceUPtr tmpSurf;
   SDL_Surface *surf;
   if ((src->w > width_) || src->h > height_)
     throw Exception("Cannot replace texture image with larger image");
@@ -187,35 +191,29 @@ void Texture2D::copyFromSurface(SDL_Surface *src)
     if ((src->format->Amask != 0) != alpha_)
       throw Exception("Cannot replace texture image with mismatched alpha");
     if (src->format->Amask == 0) {
-      surf = SDL_ConvertSurfaceFormat(src, SDL_PIXELFORMAT_RGB24, 0);
+      tmpSurf.reset(SDL_ConvertSurfaceFormat(src, SDL_PIXELFORMAT_RGB24, 0));
     } else  {
-      surf = SDL_ConvertSurfaceFormat(src, SDL_PIXELFORMAT_ABGR8888, 0);
+      tmpSurf.reset(SDL_ConvertSurfaceFormat(src, SDL_PIXELFORMAT_ABGR8888, 0));
     }
-    if (!surf)
+    if (!tmpSurf)
       throw SDLException{};
+    surf = tmpSurf.get();
   } else {
     surf = src;
   }
 
   if (SDL_MUSTLOCK(surf))
     SDL_LockSurface(surf);
-  try {
+
   bind();
   if(surf->format->Amask == 0)
     glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, surf->w, surf->h, GL_RGB, GL_UNSIGNED_BYTE, surf->pixels);
   else
     glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, surf->w, surf->h, GL_RGBA, GL_UNSIGNED_BYTE, surf->pixels);
   glGenerateMipmap(GL_TEXTURE_2D);
-  } catch(...) {
-    if (surf != src)
-      SDL_FreeSurface(surf);
-    throw;
-  }
-  if(surf != src)
-    SDL_FreeSurface(surf);
 }
 
-SDL_Surface* Texture2D::copyToSurface()
+SDLSurfaceUPtr Texture2D::copyToSurface()
 {
   bind();
   uint32_t rmask, gmask, bmask, amask;
@@ -223,16 +221,13 @@ SDL_Surface* Texture2D::copyToSurface()
   if (!SDL_PixelFormatEnumToMasks(alpha_?SDL_PIXELFORMAT_ABGR8888:SDL_PIXELFORMAT_RGB24,
 				  &bpp, &rmask, &gmask, &bmask, &amask))
     throw SDLException{};
-  SDL_Surface *dst = SDL_CreateRGBSurface(0, width_, height_, bpp,
-					  rmask, gmask, bmask, amask);
+  
+  SDLSurfaceUPtr dst(SDL_CreateRGBSurface(0, width_, height_, bpp,
+					  rmask, gmask, bmask, amask));
   if(!dst)
     throw SDLException{};
-  try {
+  
   glGetTexImage(GL_TEXTURE_2D, 0, alpha_?GL_RGBA:GL_RGB, GL_UNSIGNED_BYTE, dst->pixels);
-  } catch(...) {
-    SDL_FreeSurface(dst);
-    throw;
-  }
     
   return dst;
 }

texture.hh

@@ -61,6 +61,7 @@ private:
 
 class Texture2D {
 public:
+  Texture2D();
   Texture2D(unsigned width, unsigned height, bool alpha = false);
   Texture2D(std::string const& file);
   Texture2D(SDL_Surface *surface);
@@ -76,7 +77,11 @@ public:
   void bind() const;
 
   void copyFromSurface(SDL_Surface *src);
-  SDL_Surface* copyToSurface();
+  SDLSurfaceUPtr copyToSurface();
+
+  unsigned getWidth() const { return width_; }
+  unsigned getHeight() const { return height_; }
+  bool getAlpha() const { return alpha_; }
   
 private: