Window.c

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/*
 * ObjectivelyMVC: Object oriented MVC framework for OpenGL, SDL2 and GNU C.
 * Copyright (C) 2014 Jay Dolan <jay@jaydolan.com>
 *
 * This software is provided 'as-is', without any express or implied
 * warranty. In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 * claim that you wrote the original software. If you use this software
 * in a product, an acknowledgment in the product documentation would be
 * appreciated but is not required.
 *
 * 2. Altered source versions must be plainly marked as such, and must not be
 * misrepresented as being the original software.
 *
 * 3. This notice may not be removed or altered from any source distribution.
 */
 
#include <assert.h>
 
#include "Window.h"
 
SDL_Rect MVC_TransformToWindow(SDL_Window *window, const SDL_Rect *rect) {
 
    assert(rect);
 
    SDL_Rect transformed = *rect;
 
    int dh = 0;
    const double scale = MVC_WindowScale(window, NULL, &dh);
 
    transformed.x *= scale;
    transformed.y *= scale;
    transformed.w *= scale;
    transformed.h *= scale;
 
    transformed.y = dh - transformed.h - transformed.y;
 
    return transformed;
}
 
double MVC_WindowScale(SDL_Window *window, int *height, int *drawableHeight) {
 
    window = window ?: SDL_GL_GetCurrentWindow();
    assert(window);
 
    int h;
    SDL_GetWindowSize(window, NULL, &h);
 
    if (height) {
        *height = h;
    }
 
    if (h) {
 
        int dh;
        SDL_GL_GetDrawableSize(window, NULL, &dh);
 
        if (drawableHeight) {
            *drawableHeight = dh;
        }
 
        if (dh) {
            return dh / (double) h;
        }
    }
 
    return 1.0;
}