splash_layout.cpp File Reference

Implements splash screen layout calculations. More...

#include "src/splash/splash_layout.h"
#include <algorithm>
#include <cmath>

Include dependency graph for splash_layout.cpp:

Functions
int	splash::calculate_display_width (int screenHeight, const VIDEO_MODE &videoMode, unsigned long encoderSettings)
	Calculate the logical display width for square-pixel UI layout.
SplashLayout	splash::calculate_logo_destination (int screenWidth, int screenHeight, int logoWidth, int logoHeight, const VIDEO_MODE &videoMode, unsigned long encoderSettings)
	Calculate the centered destination rectangle for the splash logo.
float	splash::get_display_aspect_ratio (const VIDEO_MODE &videoMode, unsigned long encoderSettings)
	Return the display aspect ratio after encoder corrections.
float	splash::get_framebuffer_aspect_ratio (const VIDEO_MODE &videoMode)
	Return the framebuffer aspect ratio for a video mode.
float	splash::get_logo_width_aspect_correction (const VIDEO_MODE &videoMode, unsigned long encoderSettings)
	Return the width correction factor applied before scaling the logo.

Detailed Description

Implements splash screen layout calculations.

Function Documentation

calculate_display_width()

int splash::calculate_display_width	(	int	screenHeight,
		const VIDEO_MODE &	videoMode,
		unsigned long	encoderSettings )

Calculate the logical display width for square-pixel UI layout.

When the framebuffer aspect ratio differs from the effective display aspect, this returns the width that should be used for layout before horizontal scaling is applied back onto the framebuffer.

Parameters

screenHeight	Height of the destination surface.
videoMode	The video mode being rendered.
encoderSettings	The value returned by XVideoGetEncoderSettings().

Returns

The logical display width corresponding to the effective aspect ratio.

calculate_logo_destination()

SplashLayout splash::calculate_logo_destination	(	int	screenWidth,
		int	screenHeight,
		int	logoWidth,
		int	logoHeight,
		const VIDEO_MODE &	videoMode,
		unsigned long	encoderSettings )

Calculate the centered destination rectangle for the splash logo.

Parameters

screenWidth	Width of the destination surface.
screenHeight	Height of the destination surface.
logoWidth	Width of the source logo.
logoHeight	Height of the source logo.
videoMode	Active video mode.
encoderSettings	The value returned by XVideoGetEncoderSettings().

Returns

The scaled and centered destination rectangle.

get_display_aspect_ratio()

float splash::get_display_aspect_ratio	(	const VIDEO_MODE &	videoMode,
		unsigned long	encoderSettings )

Return the display aspect ratio after encoder corrections.

Standard-definition framebuffers may need to be displayed with a corrected aspect ratio based on the active encoder settings.

Parameters

videoMode	The video mode being rendered.
encoderSettings	The value returned by XVideoGetEncoderSettings().

Returns

The effective display aspect ratio.

get_framebuffer_aspect_ratio()

float splash::get_framebuffer_aspect_ratio

(

const VIDEO_MODE &

videoMode

)

Return the framebuffer aspect ratio for a video mode.

Parameters

videoMode

The video mode being rendered.

Returns

The framebuffer width divided by height.

get_logo_width_aspect_correction()

float splash::get_logo_width_aspect_correction	(	const VIDEO_MODE &	videoMode,
		unsigned long	encoderSettings )

Return the width correction factor applied before scaling the logo.

Parameters

videoMode	The video mode being rendered.
encoderSettings	The value returned by XVideoGetEncoderSettings().

Returns

The correction multiplier applied to the source logo width.