libvips

VipsCallbackFn ()

int
(*VipsCallbackFn) (void *a,
                   void *b);

VipsSListMap2Fn ()

void *
(*VipsSListMap2Fn) (void *item,
                    void *a,
                    void *b);

VipsSListMap4Fn ()

void *
(*VipsSListMap4Fn) (void *item,
                    void *a,
                    void *b,
                    void *c,
                    void *d);

VipsSListFold2Fn ()

void *
(*VipsSListFold2Fn) (void *item,
                     void *a,
                     void *b,
                     void *c);

vips_path_filename7 ()

char *
vips_path_filename7 (const char *path);

Return the filename part of a vips7 path. For testing only.

vips_path_mode7 ()

char *
vips_path_mode7 (const char *path);

Return the mode part of a vips7 path. For testing only.

VipsPel

typedef unsigned char VipsPel;

A picture element. Cast this to whatever the associated VipsBandFormat says to get the value.

enum VipsPrecision

How accurate an operation should be.

VipsImage

typedef struct _VipsImage VipsImage;

An image. These can represent an image on disc, a memory buffer, an image in the process of being written to disc or a partially evaluated image in memory.

VipsRegion

typedef struct {
	/* Users may read these two fields.
	 */
	VipsImage *im;		/* Link back to parent image */
	VipsRect valid;		/* Area of parent we can see */

	/* The rest of VipsRegion is private.
	 */
} VipsRegion;

A small part of a VipsImage. valid holds the left/top/width/height of the area of pixels that are available from the region.

See also: VIPS_REGION_ADDR(), vips_region_new(), vips_region_prepare().

The “bands” property

  “bands”                    gint

Number of bands in image.

Flags: Read / Write

Allowed values: [1,10000000]

Default value: 1

The “coding” property

  “coding”                   VipsCoding

Pixel coding.

Flags: Read / Write

Default value: VIPS_CODING_NONE

The “demand” property

  “demand”                   VipsDemandStyle

Preferred demand style for this image.

Flags: Read / Write

Default value: VIPS_DEMAND_STYLE_SMALLTILE

The “filename” property

  “filename”                 gchar *

Image filename.

Flags: Read / Write

Default value: NULL

The “foreign-buffer” property

  “foreign-buffer”           gpointer

Pointer to foreign pixels.

Flags: Read / Write

The “format” property

  “format”                   VipsBandFormat

Pixel format in image.

Flags: Read / Write

Default value: VIPS_FORMAT_UCHAR

The “height” property

  “height”                   gint

Image height in pixels.

Flags: Read / Write

Allowed values: [1,10000000]

Default value: 1

The “interpretation” property

  “interpretation”           VipsInterpretation

Pixel interpretation.

Flags: Read / Write

Default value: VIPS_INTERPRETATION_MULTIBAND

The “kill” property

  “kill”                     gboolean

Block evaluation on this image.

Flags: Read / Write

Default value: FALSE

The “mode” property

  “mode”                     gchar *

Open mode.

Flags: Read / Write

Default value: "p"

The “sizeof-header” property

  “sizeof-header”            guint64

Offset in bytes from start of file.

Flags: Read / Write

Allowed values: <= 1000000000

Default value: 64

The “width” property

  “width”                    gint

Image width in pixels.

Flags: Read / Write

Allowed values: [1,10000000]

Default value: 1

The “xoffset” property

  “xoffset”                  gint

Horizontal offset of origin.

Flags: Read / Write

Allowed values: [-10000000,10000000]

Default value: 0

The “xres” property

  “xres”                     gdouble

Horizontal resolution in pixels/mm.

Flags: Read / Write

Allowed values: [-0,1e+06]

Default value: 0

The “yoffset” property

  “yoffset”                  gint

Vertical offset of origin.

Flags: Read / Write

Allowed values: [-10000000,10000000]

Default value: 0

The “yres” property

  “yres”                     gdouble

Vertical resolution in pixels/mm.

Flags: Read / Write

Allowed values: [-0,1e+06]

Default value: 0

The “eval” signal

void
user_function (VipsImage *image,
               gpointer   progress,
               gpointer   user_data)

The ::eval signal is emitted once per work unit (typically a 128 x 128 area of pixels) during image computation.

You can use this signal to update user-interfaces with progress feedback. Beware of updating too frequently: you will usually need some throttling mechanism.

Use vips_image_set_progress() to turn on progress reporting for an image.

Flags: Run Last

The “invalidate” signal

void
user_function (VipsImage *image,
               gpointer   user_data)

The ::invalidate signal is emitted when an image or one of it's upstream data sources has been destructively modified. See vips_image_invalidate_all().

Flags: Action

The “minimise” signal

void
user_function (VipsImage *image,
               gpointer   user_data)

The ::minimise signal is emitted when an image has been asked to minimise memory usage. All non-essential caches are dropped. See vips_image_minimise_all().

Flags: Action

The “posteval” signal

void
user_function (VipsImage *image,
               gpointer   progress,
               gpointer   user_data)

The ::posteval signal is emitted once at the end of the computation of image . It's a good place to shut down evaluation feedback.

Use vips_image_set_progress() to turn on progress reporting for an image.

Flags: Run Last

The “preeval” signal

void
user_function (VipsImage *image,
               gpointer   progress,
               gpointer   user_data)

The ::preeval signal is emitted once before computation of image starts. It's a good place to set up evaluation feedback.

Use vips_image_set_progress() to turn on progress reporting for an image.

Flags: Run Last

The “written” signal

void
user_function (VipsImage *image,
               gpointer   result,
               gpointer   user_data)

The ::written signal is emitted just after an image has been written to. It is used by vips to implement things like write to foreign file formats.

Flags: Action