gp_dpi.h File Reference

DPI calculation and conversions. More...

#include <core/gp_debug.h>

Go to the source code of this file.

Functions
static unsigned int	gp_dpi_from_size (unsigned int w, unsigned int w_mm, unsigned int h, unsigned int h_mm)
	Calculates DPI from display physical size and resolution.
static float	gp_dpi_to_ppmm (unsigned int dpi)
	Converts DPI to dots/pixels per mm.
static gp_size	gp_dpi_mm_to_px (unsigned int dpi, float mm)
	Converts milimeters to pixels.

Detailed Description

DPI calculation and conversions.

Definition in file gp_dpi.h.

Function Documentation

gp_dpi_from_size()

static unsigned int gp_dpi_from_size ( unsigned int  w, unsigned int  w_mm, unsigned int  h, unsigned int  h_mm  )

inlinestatic

Calculates DPI from display physical size and resolution.

Parameters

w	Width in pixels.
w_mm	Width in mm.
h	Height in pixels.
h_mm	Height in mm.

Returns

An average DPI.

Definition at line 25 of file gp_dpi.h.

References GP_DEBUG.

gp_dpi_mm_to_px()

static gp_size gp_dpi_mm_to_px ( unsigned int  dpi, float  mm  )

inlinestatic

Converts milimeters to pixels.

Parameters

dpi	A DPI usually backend->dpi.
mm	Size in milimeters.

Returns

Size in pixels rounded to whole pixels.

Definition at line 53 of file gp_dpi.h.

References gp_dpi_to_ppmm().

gp_dpi_to_ppmm()

static float gp_dpi_to_ppmm ( unsigned int  dpi )

inlinestatic

Converts DPI to dots/pixels per mm.

Parameters

dpi	A DPI usually backend->dpi.

Returns

A PPMM a number of pixels per mm.

Definition at line 41 of file gp_dpi.h.

Referenced by gp_dpi_mm_to_px().