Window.c File Reference

#include <assert.h>
#include "Window.h"

Go to the source code of this file.

Functions
SDL_Rect	MVC_TransformToWindow (SDL_Window *window, const SDL_Rect *rect)
	Transforms the specified rectangle to normalized device coordinates in window. More...
double	MVC_WindowScale (SDL_Window *window, int *height, int *drawableHeight)
	Resolves the scale factor of the specified window for High-DPI support. More...

Function Documentation

MVC_TransformToWindow()

SDL_Rect MVC_TransformToWindow	(	SDL_Window *	window,
		const SDL_Rect *	rect
	)

Transforms the specified rectangle to normalized device coordinates in window.

Parameters

window	The window.
rect	A rectangle defined in object space.

Returns

The transformed rectangle.

Definition at line 28 of file Window.c.

                                                                         {
 
    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;
}

MVC_WindowScale()

double MVC_WindowScale	(	SDL_Window *	window,
		int *	height,
		int *	drawableHeight
	)

Resolves the scale factor of the specified window for High-DPI support.

Parameters

window	The window, or NULL for the current OpenGL window.
height	An optional output parameter to retrieve the window height.
drawableHeight	An optional output parameter to retrieve the window drawable height.

Returns

The scale factor of the specified window.

Remarks

Views and other classes should invoke this method to alter their rendering behavior for High-DPI displays. This is particularly relevant for Views that render textures.

Definition at line 47 of file Window.c.

                                                                             {
 
    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;
}