>Pixel Buffers
The libart library
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Pixel Buffers

Name

Pixel Buffers -- 

Synopsis



void        (*ArtDestroyNotify)             (void *func_data,
                                             void *data);
struct      ArtPixBuf;
enum        ArtPixFormat;
ArtPixBuf*  art_pixbuf_new_rgb              (art_u8 *pixels,
                                             int width,
                                             int height,
                                             int rowstride);
ArtPixBuf*  art_pixbuf_new_rgba             (art_u8 *pixels,
                                             int width,
                                             int height,
                                             int rowstride);
ArtPixBuf*  art_pixbuf_new_const_rgb        (const art_u8 *pixels,
                                             int width,
                                             int height,
                                             int rowstride);
ArtPixBuf*  art_pixbuf_new_const_rgba       (const art_u8 *pixels,
                                             int width,
                                             int height,
                                             int rowstride);
ArtPixBuf*  art_pixbuf_new_rgb_dnotify      (art_u8 *pixels,
                                             int width,
                                             int height,
                                             int rowstride,
                                             void *dfunc_data,
                                             ArtDestroyNotify dfunc);
ArtPixBuf*  art_pixbuf_new_rgba_dnotify     (art_u8 *pixels,
                                             int width,
                                             int height,
                                             int rowstride,
                                             void *dfunc_data,
                                             ArtDestroyNotify dfunc);
void        art_pixbuf_free                 (ArtPixBuf *pixbuf);
void        art_pixbuf_free_shallow         (ArtPixBuf *pixbuf);
ArtPixBuf*  art_pixbuf_duplicate            (const ArtPixBuf *pixbuf);

Description

Details

ArtDestroyNotify ()

void        (*ArtDestroyNotify)             (void *func_data,
                                             void *data);

func_data : 
data : 

struct ArtPixBuf

struct ArtPixBuf {
  /*< public >*/
  ArtPixFormat format;
  int n_channels;
  int has_alpha;
  int bits_per_sample;

  art_u8 *pixels;
  int width;
  int height;
  int rowstride;
  void *destroy_data;
  ArtDestroyNotify destroy;
};

enum ArtPixFormat

typedef enum {
  ART_PIX_RGB
  /* gray, cmyk, lab, ... ? */
} ArtPixFormat;

art_pixbuf_new_rgb ()

ArtPixBuf*  art_pixbuf_new_rgb              (art_u8 *pixels,
                                             int width,
                                             int height,
                                             int rowstride);

Creates a generic data structure for holding a buffer of RGB pixels. It is possible to think of an ArtPixBuf as a virtualization over specific pixel buffer formats.

The pixels buffer is freed with art_free() when the ArtPixBuf is destroyed. Thus, this function is suitable when the pixel data is allocated with art_alloc().

pixels : A buffer containing the actual pixel data.
width : The width of the pixbuf.
height : The height of the pixbuf.
rowstride : The rowstride of the pixbuf.
Returns : The newly created ArtPixBuf.

art_pixbuf_new_rgba ()

ArtPixBuf*  art_pixbuf_new_rgba             (art_u8 *pixels,
                                             int width,
                                             int height,
                                             int rowstride);

Creates a generic data structure for holding a buffer of RGBA pixels. It is possible to think of an ArtPixBuf as a virtualization over specific pixel buffer formats.

The pixels buffer is freed with art_free() when the ArtPixBuf is destroyed. Thus, this function is suitable when the pixel data is allocated with art_alloc().

pixels : A buffer containing the actual pixel data.
width : The width of the pixbuf.
height : The height of the pixbuf.
rowstride : The rowstride of the pixbuf.
Returns : The newly created ArtPixBuf.

art_pixbuf_new_const_rgb ()

ArtPixBuf*  art_pixbuf_new_const_rgb        (const art_u8 *pixels,
                                             int width,
                                             int height,
                                             int rowstride);

Creates a generic data structure for holding a buffer of RGB pixels. It is possible to think of an ArtPixBuf as a virtualization over specific pixel buffer formats.

No action is taken when the ArtPixBuf is destroyed. Thus, this function is useful when the pixel data is constant or statically allocated.

pixels : A buffer containing the actual pixel data.
width : The width of the pixbuf.
height : The height of the pixbuf.
rowstride : The rowstride of the pixbuf.
Returns : The newly created ArtPixBuf.

art_pixbuf_new_const_rgba ()

ArtPixBuf*  art_pixbuf_new_const_rgba       (const art_u8 *pixels,
                                             int width,
                                             int height,
                                             int rowstride);

Creates a generic data structure for holding a buffer of RGBA pixels. It is possible to think of an ArtPixBuf as a virtualization over specific pixel buffer formats.

No action is taken when the ArtPixBuf is destroyed. Thus, this function is suitable when the pixel data is constant or statically allocated.

pixels : A buffer containing the actual pixel data.
width : The width of the pixbuf.
height : The height of the pixbuf.
rowstride : The rowstride of the pixbuf.
Returns : The newly created ArtPixBuf.

art_pixbuf_new_rgb_dnotify ()

ArtPixBuf*  art_pixbuf_new_rgb_dnotify      (art_u8 *pixels,
                                             int width,
                                             int height,
                                             int rowstride,
                                             void *dfunc_data,
                                             ArtDestroyNotify dfunc);

Creates a generic data structure for holding a buffer of RGB pixels. It is possible to think of an ArtPixBuf as a virtualization over specific pixel buffer formats.

dfunc is called with dfunc_data and pixels as arguments when the ArtPixBuf is destroyed. Using a destroy notification function allows a wide range of memory management disciplines for the pixel memory. A NULL value for dfunc is also allowed and means that no special action will be taken on destruction.

pixels : A buffer containing the actual pixel data.
width : The width of the pixbuf.
height : The height of the pixbuf.
rowstride : The rowstride of the pixbuf.
dfunc_data : The private data passed to dfunc.
dfunc : The destroy notification function.
Returns : The newly created ArtPixBuf.

art_pixbuf_new_rgba_dnotify ()

ArtPixBuf*  art_pixbuf_new_rgba_dnotify     (art_u8 *pixels,
                                             int width,
                                             int height,
                                             int rowstride,
                                             void *dfunc_data,
                                             ArtDestroyNotify dfunc);

Creates a generic data structure for holding a buffer of RGBA pixels. It is possible to think of an ArtPixBuf as a virtualization over specific pixel buffer formats.

dfunc is called with dfunc_data and pixels as arguments when the ArtPixBuf is destroyed. Using a destroy notification function allows a wide range of memory management disciplines for the pixel memory. A NULL value for dfunc is also allowed and means that no special action will be taken on destruction.

pixels : A buffer containing the actual pixel data.
width : The width of the pixbuf.
height : The height of the pixbuf.
rowstride : The rowstride of the pixbuf.
dfunc_data : The private data passed to dfunc.
dfunc : The destroy notification function.
Returns : The newly created ArtPixBuf.

art_pixbuf_free ()

void        art_pixbuf_free                 (ArtPixBuf *pixbuf);

Destroys the ArtPixBuf, calling the destroy notification function (if non-NULL) so that the memory for the pixel buffer can be properly reclaimed.

pixbuf : The ArtPixBuf to be destroyed.

art_pixbuf_free_shallow ()

void        art_pixbuf_free_shallow         (ArtPixBuf *pixbuf);

Destroys the ArtPixBuf without calling the destroy notification function.

This function is deprecated. Use the _dnotify variants for allocation instead.

pixbuf : The ArtPixBuf to be destroyed.

art_pixbuf_duplicate ()

ArtPixBuf*  art_pixbuf_duplicate            (const ArtPixBuf *pixbuf);

Duplicates a pixbuf, including duplicating the buffer.

pixbuf : The ArtPixBuf to duplicate.
Returns : The duplicated pixbuf.



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