Cairo utilities

## Cairo utilities Cairo utilities |

## Synopsis

    #define             GO_CAIRO_CLAMP                      (x)
    #define             GO_CAIRO_CLAMP_SNAP                 (x,
                                                             even)
    void                go_cairo_convert_data_from_pixbuf   (unsigned char *dst,
                                                             unsigned char const *src,
                                                             int width,
                                                             int height,
                                                             int rowstride);
    void                go_cairo_convert_data_to_pixbuf     (unsigned char *dst,
                                                             unsigned char const *src,
                                                             int width,
                                                             int height,
                                                             int rowstride);
    void                go_cairo_emit_svg_path              (cairo_t *cr,
                                                             char const *path);
    gboolean            go_cairo_surface_is_vector          (cairo_surface_t const *surface);

## Description

## Details

### GO_CAIRO_CLAMP()

    #define GO_CAIRO_CLAMP(x) CLAMP((x),-8000000,8000000)

### GO_CAIRO_CLAMP_SNAP()

    #define GO_CAIRO_CLAMP_SNAP(x,even) GO_CAIRO_CLAMP(even ? floor (x + .5):floor (x) + .5)

### go_cairo_convert_data_from_pixbuf ()

    void                go_cairo_convert_data_from_pixbuf   (unsigned char *dst,
                                                             unsigned char const *src,
                                                             int width,
                                                             int height,
                                                             int rowstride);

Converts the pixel data stored in `src` in GDK_COLORSPACE_RGB pixbuf format to CAIRO_FORMAT_ARGB32 cairo format and move them to `dst`. If `src` == `dst`, pixel are converted in place.

`dst` : | a pointer to pixel data in cairo format
`src` : | a pointer to pixel data in pixbuf format
`width` : | image width
`height` : | image height
`rowstride` : | data rowstride

### go_cairo_convert_data_to_pixbuf ()

    void                go_cairo_convert_data_to_pixbuf     (unsigned char *dst,
                                                             unsigned char const *src,
                                                             int width,
                                                             int height,
                                                             int rowstride);

Converts the pixel data stored in `src` in CAIRO_FORMAT_ARGB32 cairo format to GDK_COLORSPACE_RGB pixbuf format and move them to `dst`. If `src` == `dst`, pixel are converted in place.

`dst` : | a pointer to pixel data in pixbuf format
`src` : | a pointer to pixel data in cairo format
`width` : | image width
`height` : | image height
`rowstride` : | data rowstride

### go_cairo_emit_svg_path ()

    void                go_cairo_emit_svg_path              (cairo_t *cr,
                                                             char const *path);

Emits a path described as a SVG path string (d property of path elements) to a cairo context.

`cr` : | a cairo context
`path` : | a SVG path

### go_cairo_surface_is_vector ()

    gboolean            go_cairo_surface_is_vector          (cairo_surface_t const *surface);