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Moved renderer RAII helpers to their own file and added ones for clip…
… rect and viewport
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/* | ||
Copyright (C) 2017 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. | ||
*/ | ||
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#pragma once | ||
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#include "sdl/texture.hpp" | ||
#include "video.hpp" | ||
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#include <SDL_rect.h> | ||
#include <SDL_render.h> | ||
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#include <cassert> | ||
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/** | ||
* Sets the renderer output target to the specified texture. | ||
* @todo: add support for restoring last target. | ||
*/ | ||
class render_target_setter | ||
{ | ||
public: | ||
explicit render_target_setter(texture& t) | ||
: renderer_(CVideo::get_singleton().get_renderer()) | ||
{ | ||
if(renderer_) { | ||
// Validate we can render to this texture. | ||
assert(t.get_info().access == SDL_TEXTUREACCESS_TARGET); | ||
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SDL_SetRenderTarget(renderer_, t); | ||
} | ||
} | ||
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~render_target_setter() | ||
{ | ||
if(renderer_) { | ||
SDL_SetRenderTarget(renderer_, nullptr); | ||
} | ||
} | ||
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private: | ||
SDL_Renderer* renderer_; | ||
}; | ||
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using sdl_rect_getter = void (*)(SDL_Renderer*, SDL_Rect*); | ||
using sdl_rect_setter = int (*)(SDL_Renderer*, const SDL_Rect*); | ||
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/** | ||
* Base class for renderer RAII helpers that operate on SDL_Rects. | ||
* | ||
* @tparam G Getter function. Will fetch the current applicable rect. | ||
* That will be restored as the applicable state once this object is destroyed. | ||
* @tparam S Setter function. | ||
*/ | ||
template<sdl_rect_getter G, sdl_rect_setter S> | ||
class render_raii_rect_setter_base | ||
{ | ||
public: | ||
explicit render_raii_rect_setter_base(SDL_Rect* rect) | ||
: operate_(rect != nullptr) | ||
, last_rect_() | ||
, renderer_(CVideo::get_singleton().get_renderer()) | ||
{ | ||
if(renderer_ && operate_) { | ||
(*G)(renderer_, &last_rect_); | ||
(*S)(renderer_, rect); | ||
} | ||
} | ||
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~render_raii_rect_setter_base() | ||
{ | ||
if(renderer_ && operate_) { | ||
(*S)(renderer_, &last_rect_); | ||
} | ||
} | ||
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private: | ||
const bool operate_; | ||
SDL_Rect last_rect_; | ||
SDL_Renderer* renderer_; | ||
}; | ||
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/** | ||
* Sets the renderer clip rect. | ||
*/ | ||
using render_clip_rect_setter = render_raii_rect_setter_base< | ||
&SDL_RenderGetClipRect, | ||
&SDL_RenderSetClipRect>; | ||
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/** | ||
* Sets the renderer viewport rect. | ||
*/ | ||
using render_viewport_setter = render_raii_rect_setter_base< | ||
&SDL_RenderGetViewport, | ||
&SDL_RenderSetViewport>; |
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