Add the initial SDL_Texture wrapper code.

src/CMakeLists.txt

@@ -358,6 +358,7 @@ endif()
 
 set(wesnoth-sdl_SRC
 	sdl/alpha.cpp
+	sdl/texture.cpp
 	sdl/window.cpp
 )
 

src/SConscript

@@ -150,6 +150,7 @@ libcampaignd = env.Library("campaignd", libcampaignd_sources, OBJPREFIX = "campa
 libwesnoth_sdl_sources = Split("""
     sdl_utils.cpp
     sdl/alpha.cpp
+    sdl/texture.cpp
     sdl/window.cpp
     tracer.cpp
     """)

src/sdl/texture.cpp

@@ -0,0 +1,78 @@
+/*
+   Copyright (C) 2014 by Mark de Wever <koraq@xs4all.nl>
+   Part of the Battle for Wesnoth Project http://www.wesnoth.org/
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY.
+
+   See the COPYING file for more details.
+*/
+
+#include "sdl/texture.hpp"
+
+#if SDL_VERSION_ATLEAST(2, 0, 0)
+
+#include "log.hpp"
+
+#include <cassert>
+
+static lg::log_domain log_display("display");
+#define ERR_DP LOG_STREAM(err, log_display)
+
+namespace sdl
+{
+
+ttexture::ttexture(SDL_Renderer& renderer,
+				   const Uint32 format,
+				   const int access,
+				   const int w,
+				   const int h)
+	: reference_count_(new unsigned(1))
+	, texture_(SDL_CreateTexture(&renderer, format, access, w, h))
+{
+	if(!texture_) {
+		ERR_DP << "Failed to create a SDL_Texture object with error »"
+			   << SDL_GetError() << "«.\n";
+	}
+}
+
+ttexture::~ttexture()
+{
+	assert(reference_count_);
+
+	--(*reference_count_);
+	if(*reference_count_ == 0) {
+		if(texture_) {
+			SDL_DestroyTexture(texture_);
+		}
+		delete reference_count_;
+	}
+}
+
+ttexture::ttexture(const ttexture& texture)
+	: reference_count_(texture.reference_count_), texture_(texture.texture_)
+{
+	assert(reference_count_);
+	++(*reference_count_);
+
+	/* In the unlikely case the reference count wraps, we die. */
+	assert(*reference_count_ != 0);
+}
+
+ttexture& ttexture::operator=(const ttexture& texture)
+{
+	if(&texture != this) {
+		this->~ttexture();
+		new (this) ttexture(texture);
+	}
+
+	return *this;
+}
+
+} // namespace sdl
+
+#endif

src/sdl/texture.hpp

@@ -0,0 +1,85 @@
+/*
+   Copyright (C) 2014 by Mark de Wever <koraq@xs4all.nl>
+   Part of the Battle for Wesnoth Project http://www.wesnoth.org/
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY.
+
+   See the COPYING file for more details.
+*/
+
+#ifndef SDL_TEXTURE_HPP_INCLUDED
+#define SDL_TEXTURE_HPP_INCLUDED
+
+/**
+ * @file
+ * Contains a wrapper class for the @ref SDL_Texture class.
+ */
+
+#include <SDL_version.h>
+
+#if SDL_VERSION_ATLEAST(2, 0, 0)
+
+#include <SDL_render.h>
+
+namespace sdl
+{
+
+/**
+ * The reference counted wrapper class for the @ref SDL_Texture class.
+ */
+class ttexture
+{
+public:
+
+	/***** ***** ***** Constructor and destructor. ***** ***** *****/
+
+	/**
+	 * Constructor.
+	 *
+	 * The function calls @ref SDL_CreateTexture.
+	 *
+	 * @param renderer            Used as renderer for @ref SDL_CreateTexture.
+	 * @param format              Used as format for @ref SDL_CreateTexture.
+	 * @param access              Used as access for @ref SDL_CreateTexture.
+	 * @param w                   Used as w for @ref SDL_CreateTexture.
+	 * @param h                   Used as x for @ref SDL_CreateTexture.
+	 */
+	ttexture(SDL_Renderer& renderer,
+			 const Uint32 format,
+			 const int access,
+			 const int w,
+			 const int h);
+
+	~ttexture();
+
+	ttexture(const ttexture& texture);
+
+	ttexture& operator=(const ttexture& texture);
+
+
+	/***** ***** ***** Members. ***** ***** *****/
+
+private:
+
+	/**
+	 * The reference count of the texture.
+	 *
+	 * Since allocating the reference counter can throw an exception it is the
+	 * first member of the class.
+	 */
+	unsigned* reference_count_;
+
+	/** The SDL_Texture we manage. */
+	SDL_Texture* texture_;
+};
+
+} // namespace sdl
+
+#endif
+
+#endif