Enable rendering text as a texture.

src/text.cpp

@@ -29,6 +29,10 @@
 #include <cassert>
 #include <cstring>
 
+#if SDL_VERSION_ATLEAST(2,0,0)
+#include "video.hpp"
+#endif
+
 namespace font {
 
 namespace {
@@ -155,6 +159,14 @@ surface ttext::render() const
 	return surface_;
 }
 
+#if SDL_VERSION_ATLEAST(2,0,0)
+sdl::ttexture ttext::render_as_texture() const
+{
+	rerender();
+	return texture_;
+}
+#endif
+
 int ttext::get_width() const
 {
 	return get_size().x;
@@ -684,6 +696,10 @@ void ttext::rerender(const bool force) const
 		surface_.assign(SDL_CreateRGBSurfaceFrom(
 			surface_buffer_, width, height, 32, stride,
 			0x00FF0000, 0x0000FF00, 0x000000FF, 0xFF000000));
+#if SDL_VERSION_ATLEAST(2,0,0)
+		texture_ = CVideo::get_window()->create_texture
+				(SDL_TEXTUREACCESS_STATIC, surface_);
+#endif
 		cairo_destroy(cr);
 		cairo_surface_destroy(cairo_surface);
 	}

src/text.hpp

@@ -25,6 +25,10 @@
 
 #include <string>
 
+#if SDL_VERSION_ATLEAST(2,0,0)
+#include "sdl/texture.hpp"
+#endif
+
 struct language_def;
 
 namespace gui2 {
@@ -72,6 +76,16 @@ class ttext
 	 */
 	surface render() const;
 
+#if SDL_VERSION_ATLEAST(2,0,0)
+	/**
+	 * Returns the rendered text as a texture.
+	 *
+	 * Before rendering it tests whether a redraw is needed and if so it first
+	 * redraws the texture before returning it.
+	 */
+	sdl::ttexture render_as_texture() const;
+#endif
+
 	/** Returns the width needed for the text. */
 	int get_width() const;
 
@@ -208,6 +222,11 @@ class ttext
 	/** The surface to render upon used as a cache. */
 	mutable surface surface_;
 
+#if SDL_VERSION_ATLEAST(2,0,0)
+	/** The texture to render upon used as a cache. */
+	mutable sdl::ttexture texture_;
+#endif
+
 	/** The text to draw (stored as UTF-8). */
 	std::string text_;