libvips

VIPS_RECT_RIGHT()

#define VIPS_RECT_RIGHT(R) ((R)->left + (R)->width)

VIPS_RECT_BOTTOM()

#define VIPS_RECT_BOTTOM(R) ((R)->top + (R)->height)

VIPS_RECT_HCENTRE()

#define VIPS_RECT_HCENTRE(R) ((R)->left + (R)->width / 2)

VIPS_RECT_VCENTRE()

#define VIPS_RECT_VCENTRE(R) ((R)->top + (R)->height / 2)

vips_rect_isempty ()

gboolean
vips_rect_isempty (const VipsRect *r);

Is r empty? ie. zero width or height.

vips_rect_includespoint ()

gboolean
vips_rect_includespoint (const VipsRect *r,
                         int x,
                         int y);

Does r contain point (x , y )?

vips_rect_includesrect ()

gboolean
vips_rect_includesrect (const VipsRect *r1,
                        const VipsRect *r2);

Is r2 a subset of r1 ?

vips_rect_equalsrect ()

gboolean
vips_rect_equalsrect (const VipsRect *r1,
                      const VipsRect *r2);

Is r1 equal to r2 ?

vips_rect_overlapsrect ()

gboolean
vips_rect_overlapsrect (const VipsRect *r1,
                        const VipsRect *r2);

Do r1 and r2 have a non-empty intersection?

vips_rect_marginadjust ()

void
vips_rect_marginadjust (VipsRect *r,
                        int n);

Enlarge r by n . +1 means out one pixel.

vips_rect_intersectrect ()

void
vips_rect_intersectrect (const VipsRect *r1,
                         const VipsRect *r2,
                         VipsRect *out);

Fill out with the intersection of r1 and r2 . out can equal r1 or r2 .

vips_rect_unionrect ()

void
vips_rect_unionrect (const VipsRect *r1,
                     const VipsRect *r2,
                     VipsRect *out);

Fill out with the bounding box of r1 and r2 . out can equal r1 or r2 .

vips_rect_dup ()

VipsRect *
vips_rect_dup (const VipsRect *r);

Duplicate a rect to the heap. You need to free the result with g_free().

[skip]

vips_rect_normalise ()

void
vips_rect_normalise (VipsRect *r);

Make sure width and height are >0 by moving the origin and flipping the rect.

VipsRect

typedef struct {
	int left;
	int top;
	int width;
	int height;
} VipsRect;

A VipsRect is a rectangular area of pixels. This is a struct for performing simple rectangle algebra.