pixbuf.h File Reference

Pixel buffer. More...

#include <stddef.h>
#include <ipxe/refcnt.h>

Go to the source code of this file.

Data Structures
struct	pixel_buffer
	A pixel buffer. More...

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
static	__attribute__ ((always_inline)) struct pixel_buffer *pixbuf_get(struct pixel_buffer *pixbuf)
	Get reference to pixel buffer. More...
struct pixel_buffer *	alloc_pixbuf (unsigned int width, unsigned int height)
	Allocate pixel buffer. More...

Variables
static unsigned int	x
static unsigned int unsigned int	y
	index = ( ( y * pixbuf->width ) + x )
return &pixbuf	data [index]

Detailed Description

Pixel buffer.

Definition in file pixbuf.h.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

__attribute__()

static __attribute__ ( (always_inline)  )

inlinestatic

Get reference to pixel buffer.

Get pixel.

Drop reference to pixel buffer.

Parameters

pixbuf

Pixel buffer

Return values

pixbuf

Pixel buffer

Parameters

pixbuf	Pixel buffer
pixbuf	Pixel buffer
x	X position
y	Y position

Return values

pixel

Pixel

Definition at line 37 of file pixbuf.h.

                                           {
        ref_get ( &pixbuf->refcnt );
        return pixbuf;
}

References ref_get, and pixel_buffer::refcnt.

alloc_pixbuf()

struct pixel_buffer* alloc_pixbuf	(	unsigned int	width,
		unsigned int	height
	)

Allocate pixel buffer.

Parameters

width

Width @h height Height

Return values

pixbuf

Pixel buffer, or NULL on failure

Definition at line 59 of file pixbuf.c.

                                                                               {
        struct pixel_buffer *pixbuf;

        /* Allocate and initialise structure */
        pixbuf = zalloc ( sizeof ( *pixbuf ) );
        if ( ! pixbuf )
                goto err_alloc_pixbuf;
        ref_init ( &pixbuf->refcnt, free_pixbuf );
        pixbuf->width = width;
        pixbuf->height = height;
        pixbuf->pixels = ( width * height );
        pixbuf->len = ( pixbuf->pixels * sizeof ( uint32_t ) );

        /* Check for multiplication overflow */
        if ( ( width != 0 ) &&
             ( ( pixbuf->len / sizeof ( uint32_t ) ) / width ) != height ) {
                goto err_overflow;
        }

        /* Allocate pixel data buffer */
        pixbuf->data = umalloc ( pixbuf->len );
        if ( ! pixbuf->data )
                goto err_alloc_data;

        return pixbuf;

 err_alloc_data:
 err_overflow:
        pixbuf_put ( pixbuf );
 err_alloc_pixbuf:
        return NULL;
}

References pixel_buffer::data, free_pixbuf(), pixel_buffer::height, pixel_buffer::len, NULL, pixel_buffer::pixels, ref_init, pixel_buffer::refcnt, umalloc(), pixel_buffer::width, and zalloc().

Referenced by png_image_header(), and pnm_pixbuf().

Variable Documentation

x

unsigned int x

Definition at line 62 of file pixbuf.h.

Referenced by __attribute__(), ansiscr_movetoyx(), ar9003_hw_power_interpolate(), efifb_draw(), eth_pio_write(), fbcon_picture_init(), fls(), interpolate(), max(), min(), move(), mvaddch(), mvaddchnstr(), mvaddchstr(), mvaddnstr(), mvaddstr(), mvdelch(), mvgetch(), mvgetnstr(), mvgetstr(), mvhline(), mvvline(), mvwaddch(), mvwaddchnstr(), mvwaddchstr(), mvwaddnstr(), mvwaddstr(), mvwdelch(), mvwgetch(), mvwgetnstr(), mvwgetstr(), mvwhline(), mvwin(), mvwvline(), png_pixels_pass(), smi_phy_addr(), smi_reg_addr(), test_bswap16(), test_bswap16s(), test_bswap32(), test_bswap32s(), test_bswap64(), test_bswap64s(), and wmove().

y

unsigned int unsigned int y

Initial value:

{
        unsigned int index

Definition at line 62 of file pixbuf.h.

Referenced by ansiscr_movetoyx(), ar9003_hw_power_interpolate(), efifb_draw(), fbcon_picture_init(), max(), min(), move(), mvaddch(), mvaddchnstr(), mvaddchstr(), mvaddnstr(), mvaddstr(), mvdelch(), mvgetch(), mvgetnstr(), mvgetstr(), mvhline(), mvvline(), mvwaddch(), mvwaddchnstr(), mvwaddchstr(), mvwaddnstr(), mvwaddstr(), mvwdelch(), mvwgetch(), mvwgetnstr(), mvwgetstr(), mvwhline(), mvwin(), mvwvline(), png_pixels_pass(), and wmove().

index

index = ( ( y * pixbuf->width ) + x )

Definition at line 65 of file pixbuf.h.

data

return& pixbuf data[index]

Definition at line 66 of file pixbuf.h.