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# Gdk::Pixbuf Class Reference

Inheritance diagram for Gdk::Pixbuf:

[legend]
List of all members.

## Public Types
typedef Glib::SListHandle< Glib::RefPtr<PixbufFormat>, PixbufFormatTraits > | SListHandle_PixbufFormat
typedef sigc::slot< void, const guint8* > | SlotDestroyData
## Public Member Functions
Glib::RefPtr<Gdk::Pixbuf> | add_alpha (bool substitute_color, guint8 r, guint8 g, guint8 b) const
| Takes an existing pixbuf and adds an alpha channel to it.
void | composite (const Glib::RefPtr<Gdk::Pixbuf>& dest, int dest_x, int dest_y, int dest_width, int dest_height, double offset_x, double offset_y, double scale_x, double scale_y, InterpType interp_type, int overall_alpha) const
| Creates a transformation of the source image src by scaling by scale_x and scale_y then translating by offset_x and offset_y .
void | composite_color (const Glib::RefPtr<Gdk::Pixbuf>& dest, int dest_x, int dest_y, int dest_width, int dest_height, double offset_x, double offset_y, double scale_x, double scale_y, InterpType interp_type, int overall_alpha, int check_x, int check_y, int check_size, guint32 color1, guint32 color2) const
| Creates a transformation of the source image src by scaling by scale_x and scale_y then translating by offset_x and offset_y , then composites the rectangle ( dest_x , dest_y , dest_width , dest_height ) of the resulting image with a checkboard of the colors color1 and color2 and renders it onto the destination image.
Glib::RefPtr<Gdk::Pixbuf> | composite_color_simple (int dest_width, int dest_height, InterpType interp_type, int overall_alpha, int check_size, guint32 color1, guint32 color2) const
| Creates a new Gdk::Pixbuf by scaling src to dest_width x dest_height and compositing the result with a checkboard of colors color1 and color2 .
Glib::RefPtr<Pixbuf> | copy () const
| Creates a new Gdk::Pixbuf with a copy of the information in the specified pixbuf .
void | copy_area (int src_x, int src_y, int width, int height, const Glib::RefPtr<Gdk::Pixbuf>& dest_pixbuf, int dest_x, int dest_y) const
| Copies a rectangular area from src_pixbuf to dest_pixbuf .
void | fill (guint32 pixel)
| Clears a pixbuf to the given RGBA value, converting the RGBA value into the pixbuf's pixel format.
Glib::RefPtr<Gdk::Pixbuf> | flip (bool horizontal=true) const
| Flips a pixbuf horizontally or vertically and returns the result in a new pixbuf.
int | get_bits_per_sample () const
| Queries the number of bits per color sample in a pixbuf.
Colorspace | get_colorspace () const
| Queries the color space of a pixbuf.
bool | get_has_alpha () const
| Queries whether a pixbuf has an alpha channel (opacity information).
int | get_height () const
| Queries the height of a pixbuf.
int | get_n_channels () const
| Queries the number of channels of a pixbuf.
Glib::ustring | get_option (const Glib::ustring& key) const
| Looks up key in the list of options that may have been attached to the pixbuf when it was loaded, or that may have been attached by another function using set_option().
guint8* | get_pixels () const
| Queries a pointer to the pixel data of a pixbuf.
int | get_rowstride () const
| Queries the rowstride of a pixbuf, which is the number of bytes between the start of a row and the start of the next row.
int | get_width () const
| Queries the width of a pixbuf.
const GdkPixbuf* | gobj () const
| Provides access to the underlying C GObject.
GdkPixbuf* | gobj ()
| Provides access to the underlying C GObject.
GdkPixbuf* | gobj_copy ()
| Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.
void | render_pixmap_and_mask (Glib::RefPtr<Pixmap>& pixmap_return, Glib::RefPtr<Bitmap>& mask_return, int alpha_threshold)
void | render_pixmap_and_mask_for_colormap (const Glib::RefPtr<Colormap>& colormap, Glib::RefPtr<Pixmap>& pixmap_return, Glib::RefPtr<Bitmap>& mask_return, int alpha_threshold)
void | render_threshold_alpha (const Glib::RefPtr<Gdk::Bitmap>& bitmap, int src_x, int src_y, int dest_x, int dest_y, int width, int height, int alpha_threshold)
| Takes the opacity values in a rectangular portion of a pixbuf and thresholds them to produce a bi-level alpha mask that can be used as a clipping mask for a drawable.
void | render_to_drawable (const Glib::RefPtr<Drawable>& drawable, const Glib::RefPtr<Gdk::GC>& gc, int src_x, int src_y, int dest_x, int dest_y, int width, int height, RgbDither dither, int x_dither, int y_dither)
| Renders a rectangular portion of a pixbuf to a drawable while using the specified GC.
void | render_to_drawable_alpha (const Glib::RefPtr<Drawable>& drawable, int src_x, int src_y, int dest_x, int dest_y, int width, int height, PixbufAlphaMode alpha_mode, int alpha_threshold, RgbDither dither, int x_dither, int y_dither)
| Renders a rectangular portion of a pixbuf to a drawable.
Glib::RefPtr<Gdk::Pixbuf> | rotate_simple (PixbufRotation angle) const
| Rotates a pixbuf by a multiple of 90 degrees, and returns the result in a new pixbuf.
void | saturate_and_pixelate (const Glib::RefPtr<Gdk::Pixbuf>& dest, float saturation, bool pixelate) const
| Modifies saturation and optionally pixelates src , placing the result in dest .
void | save (const std::string& filename, const Glib::ustring& type, const Glib::StringArrayHandle& option_keys, const Glib::StringArrayHandle& option_values)
| Saves pixbuf to a file in format type.
void | save (const std::string& filename, const Glib::ustring& type)
| Saves pixbuf to a file in format type.
void | save_to_buffer (gchar*& buffer, gsize& buffer_size, const Glib::ustring& type, const Glib::StringArrayHandle& option_keys, const Glib::StringArrayHandle& option_values)
void | save_to_buffer (gchar*& buffer, gsize& buffer_size, const Glib::ustring& type="png")
void | scale (const Glib::RefPtr<Gdk::Pixbuf>& dest, int dest_x, int dest_y, int dest_width, int dest_height, double offset_x, double offset_y, double scale_x, double scale_y, InterpType interp_type) const
| Creates a transformation of the source image src by scaling by scale_x and scale_y then translating by offset_x and offset_y , then renders the rectangle ( dest_x , dest_y , dest_width , dest_height ) of the resulting image onto the destination image replacing the previous contents.
Glib::RefPtr<Gdk::Pixbuf> | scale_simple (int dest_width, int dest_height, InterpType interp_type) const
| Create a new Gdk::Pixbuf containing a copy of src scaled to dest_width x dest_height .
virtual | ~Pixbuf ()
## Static Public Member Functions
static Glib::RefPtr<Pixbuf> | create (Colorspace colorspace, bool has_alpha, int bits_per_sample, int width, int height)
| Creates a new Gdk::Pixbuf structure and allocates a buffer for it.
static Glib::RefPtr<Pixbuf> | create (const Glib::RefPtr<Image>& src, int src_x, int src_y, int width, int height)
| Creates a pixbuf object from an image, using the colormap from the image.
static Glib::RefPtr<Pixbuf> | create (const Glib::RefPtr<Image>& src, const Glib::RefPtr<Colormap>& cmap, int src_x, int src_y, int width, int height)
| Creates a pixbuf object from an image.
static Glib::RefPtr<Pixbuf> | create (const Glib::RefPtr<Drawable>& src, int src_x, int src_y, int width, int height)
| Creates a pixbuf object from a drawable, using the colormap from the drawable.
static Glib::RefPtr<Pixbuf> | create (const Glib::RefPtr<Drawable>& src, const Glib::RefPtr<Colormap>& cmap, int src_x, int src_y, int width, int height)
| Creates a pixbuf object from a drawable.
static Glib::RefPtr<Pixbuf> | create (const Glib::RefPtr<Image>& src, const Glib::RefPtr<Colormap>& cmap, int src_x, int src_y, int dest_x, int dest_y, int width, int height)
static Glib::RefPtr<Pixbuf> | create (const Glib::RefPtr<Drawable>& src, const Glib::RefPtr<Colormap>& cmap, int src_x, int src_y, int dest_x, int dest_y, int width, int height)
static Glib::RefPtr<Pixbuf> | create_from_data (const guint8* data, Colorspace colorspace, bool has_alpha, int bits_per_sample, int width, int height, int rowstride, const SlotDestroyData& destroy_slot)
| Creates a new Gdk::Pixbuf out of in-memory image data.
static Glib::RefPtr<Pixbuf> | create_from_data (const guint8* data, Colorspace colorspace, bool has_alpha, int bits_per_sample, int width, int height, int rowstride)
| Creates a new Gdk::Pixbuf out of in-memory image data.
static Glib::RefPtr<Pixbuf> | create_from_file (const std::string& filename, int width, int height, bool preserve_aspect_ratio=true)
| Creates a new pixbuf by loading an image from a file.
static Glib::RefPtr<Pixbuf> | create_from_file (const std::string& filename)
| Creates a new pixbuf by loading an image from a file.
static Glib::RefPtr<Pixbuf> | create_from_inline (int data_length, const guint8* data, bool copy_pixels=false)
| Create a Gdk::Pixbuf from a flat representation that is suitable for storing as inline data in a program.
static Glib::RefPtr<Pixbuf> | create_from_xpm_data (const char* const* data)
| Creates a new pixbuf by parsing XPM data in memory.
static Glib::RefPtr<Pixbuf> | create_subpixbuf (const Glib::RefPtr<Pixbuf>& src_pixbuf, int src_x, int src_y, int width, int height)
| Creates a new pixbuf which represents a sub-region of src_pixbuf .
static SListHandle_PixbufFormat | get_formats ()
## Protected Member Functions
| Pixbuf (const Glib::RefPtr<Image>& src, const Glib::RefPtr<Colormap>& cmap, int src_x, int src_y, int dest_x, int dest_y, int width, int height)
| Pixbuf (const Glib::RefPtr<Image>& src, int src_x, int src_y, int width, int height)
| Creates a pixbuf object from an image, using the colormap from the image.
| Pixbuf (const Glib::RefPtr<Image>& src, const Glib::RefPtr<Colormap>& cmap, int src_x, int src_y, int width, int height)
| Creates a pixbuf object from an image.
| Pixbuf (const Glib::RefPtr<Drawable>& src, const Glib::RefPtr<Colormap>& cmap, int src_x, int src_y, int dest_x, int dest_y, int width, int height)
| Pixbuf (const Glib::RefPtr<Drawable>& src, int src_x, int src_y, int width, int height)
| Creates a pixbuf object from a drawable, using the colormap from the drawable.
| Pixbuf (const Glib::RefPtr<Drawable>& src, const Glib::RefPtr<Colormap>& cmap, int src_x, int src_y, int width, int height)
| Creates a pixbuf object from a drawable.
## Related Functions
(Note that these are not member functions.)
Glib::RefPtr<Gdk::Pixbuf> | wrap (GdkPixbuf* object, bool take_copy=false)
| A Glib::wrap() method for this object.

## Member Typedef Documentation

typedef Glib::SListHandle<Glib::RefPtr<PixbufFormat>, PixbufFormatTraits> Gdk::Pixbuf::SListHandle_PixbufFormat

typedef sigc::slot<void, const guint8*> Gdk::Pixbuf::SlotDestroyData

## Constructor & Destructor Documentation

virtual Gdk::Pixbuf::~Pixbuf | ( |  | ) | `[virtual]`

Gdk::Pixbuf::Pixbuf | ( | const Glib::RefPtr<Drawable>& | src,
|  | const Glib::RefPtr<Colormap>& | cmap,
|  | int | src_x,
|  | int | src_y,
|  | int | width,
|  | int | height |
| ) |  |  | `[protected]`

Creates a pixbuf object from a drawable.

Transfers image data from a Drawable and converts it to an RGB(A) representation inside a Pixbuf. In other words, copies image data from a server-side drawable to a client-side RGB(A) buffer. This allows you to efficiently read individual pixels on the client side.

If the drawable has no colormap (See Gdk::Drawable::get_colormap()), then a suitable colormap must be specified. Otherwise, you may use the constructor that takes no colormap argument. Typically a Gdk::Window or a pixmap created by passing a Gdk:Window to the Gdk::Pixbuf constructor will already have a colormap associated with it. If the drawable is a bitmap (1 bit per pixel pixmap), then a colormap is not required; pixels with a value of 1 are assumed to be white, and pixels with a value of 0 are assumed to be black. For taking screenshots, Gdk::Colormap::get_system() returns the correct colormap to use.

This will create an RGB pixbuf with 8 bits per channel and no alpha, with the same size specified by the width and height arguments.

If the specified drawable is a pixmap, then the requested source rectangle must be completely contained within the pixmap, otherwise the constructor will fail. For pixmaps only (not for windows) passing -1 for width or height is allowed to mean the full width or height of the pixmap.

If the specified drawable is a window, and the window is off the screen, then there is no image data in the obscured/offscreen regions to be placed in the pixbuf. The contents of portions of the pixbuf corresponding to the offscreen region are undefined.

If the window you're obtaining data from is partially obscured by other windows, then the contents of the pixbuf areas corresponding to the obscured regions are undefined.

See alo Gdk::Drawable::get_image().

Parameters:

  | src | Source drawable.
  | cmap,: | A colormap.
  | src_x | Source X coordinate within drawable.
  | src_y | Source Y coordinate within drawable.
  | width | Width in pixels of region to get.
  | height | Height in pixels of region to get.

Since gtkmm 2.12:

Gdk::Pixbuf::Pixbuf | ( | const Glib::RefPtr<Drawable>& | src,
|  | int | src_x,
|  | int | src_y,
|  | int | width,
|  | int | height |
| ) |  |  | `[protected]`

Creates a pixbuf object from a drawable, using the colormap from the drawable.

Parameters:

  | src | Source drawable.
  | src_x | Source X coordinate within drawable.
  | src_y | Source Y coordinate within drawable.
  | width | Width in pixels of region to get.
  | height | Height in pixels of region to get.

Since gtkmm 2.12:

Gdk::Pixbuf::Pixbuf | ( | const Glib::RefPtr<Drawable>& | src,
|  | const Glib::RefPtr<Colormap>& | cmap,
|  | int | src_x,
|  | int | src_y,
|  | int | dest_x,
|  | int | dest_y,
|  | int | width,
|  | int | height |
| ) |  |  | `[protected]`

Deprecated:
  Use the constructor without dest_x and dest_y parameters.

Gdk::Pixbuf::Pixbuf | ( | const Glib::RefPtr<Image>& | src,
|  | const Glib::RefPtr<Colormap>& | cmap,
|  | int | src_x,
|  | int | src_y,
|  | int | width,
|  | int | height |
| ) |  |  | `[protected]`

Creates a pixbuf object from an image.

Parameters:

  | src | Source Image.
  | cmap | A colormap.
  | src_x | Source X coordinate within the image.
  | src_y | Source Y coordinate within the image.
  | width | Width in pixels of region to get.
  | height | Height in pixels of region to get.

Since gtkmm 2.12:

Gdk::Pixbuf::Pixbuf | ( | const Glib::RefPtr<Image>& | src,
|  | int | src_x,
|  | int | src_y,
|  | int | width,
|  | int | height |
| ) |  |  | `[protected]`

Creates a pixbuf object from an image, using the colormap from the image.

Parameters:

  | src | Source Image.
  | src_x | Source X coordinate within the image.
  | src_y | Source Y coordinate within the image.
  | width | Width in pixels of region to get.
  | height | Height in pixels of region to get.

Gdk::Pixbuf::Pixbuf | ( | const Glib::RefPtr<Image>& | src,
|  | const Glib::RefPtr<Colormap>& | cmap,
|  | int | src_x,
|  | int | src_y,
|  | int | dest_x,
|  | int | dest_y,
|  | int | width,
|  | int | height |
| ) |  |  | `[protected]`

Deprecated:
  Use the constructors without dest_x and dest_y parameters.

## Member Function Documentation

Glib::RefPtr<Gdk::Pixbuf> Gdk::Pixbuf::add_alpha | ( | bool | substitute_color,
|  | guint8 | r,
|  | guint8 | g,
|  | guint8 | b |
| ) |  |  | const

Takes an existing pixbuf and adds an alpha channel to it.

If the existing pixbuf already had an alpha channel, the channel values are copied from the original; otherwise, the alpha channel is initialized to 255 (full opacity).

If substitute_color is `true`, then the color specified by ( r , g , b ) will be assigned zero opacity. That is, if you pass (255, 255, 255) for the substitute color, all white pixels will become fully transparent.

Parameters:

  | substitute_color | Whether to set a color to zero opacity. If this is `false`, then the ( r , g , b ) arguments will be ignored.
  | r | Red value to substitute.
  | g | Green value to substitute.
  | b | Blue value to substitute.

Returns:
  A newly-created pixbuf with a reference count of 1.

void Gdk::Pixbuf::composite | ( | const Glib::RefPtr<Gdk::Pixbuf>& | dest,
|  | int | dest_x,
|  | int | dest_y,
|  | int | dest_width,
|  | int | dest_height,
|  | double | offset_x,
|  | double | offset_y,
|  | double | scale_x,
|  | double | scale_y,
|  | InterpType | interp_type,
|  | int | overall_alpha |
| ) |  |  | const

Creates a transformation of the source image src by scaling by scale_x and scale_y then translating by offset_x and offset_y .

This gives an image in the coordinates of the destination pixbuf. The rectangle ( dest_x , dest_y , dest_width , dest_height ) is then composited onto the corresponding rectangle of the original destination image.

When the destination rectangle contains parts not in the source image, the data at the edges of the source image is replicated to infinity.

<figure id="pixbuf-composite-diagram"> <title>Compositing of pixbufs</title> <graphic fileref="composite.png" format="PNG"/> </figure>

Parameters:

  | dest | The Gdk::Pixbuf into which to render the results.
  | dest_x | The left coordinate for region to render.
  | dest_y | The top coordinate for region to render.
  | dest_width | The width of the region to render.
  | dest_height | The height of the region to render.
  | offset_x | The offset in the X direction (currently rounded to an integer).
  | offset_y | The offset in the Y direction (currently rounded to an integer).
  | scale_x | The scale factor in the X direction.
  | scale_y | The scale factor in the Y direction.
  | interp_type | The interpolation type for the transformation.
  | overall_alpha | Overall alpha for source image (0..255).

void Gdk::Pixbuf::composite_color | ( | const Glib::RefPtr<Gdk::Pixbuf>& | dest,
|  | int | dest_x,
|  | int | dest_y,
|  | int | dest_width,
|  | int | dest_height,
|  | double | offset_x,
|  | double | offset_y,
|  | double | scale_x,
|  | double | scale_y,
|  | InterpType | interp_type,
|  | int | overall_alpha,
|  | int | check_x,
|  | int | check_y,
|  | int | check_size,
|  | guint32 | color1,
|  | guint32 | color2 |
| ) |  |  | const

Creates a transformation of the source image src by scaling by scale_x and scale_y then translating by offset_x and offset_y , then composites the rectangle ( dest_x , dest_y , dest_width , dest_height ) of the resulting image with a checkboard of the colors color1 and color2 and renders it onto the destination image.

See composite_color_simple() for a simpler variant of this function suitable for many tasks.

Parameters:

  | dest | The Gdk::Pixbuf into which to render the results.
  | dest_x | The left coordinate for region to render.
  | dest_y | The top coordinate for region to render.
  | dest_width | The width of the region to render.
  | dest_height | The height of the region to render.
  | offset_x | The offset in the X direction (currently rounded to an integer).
  | offset_y | The offset in the Y direction (currently rounded to an integer).
  | scale_x | The scale factor in the X direction.
  | scale_y | The scale factor in the Y direction.
  | interp_type | The interpolation type for the transformation.
  | overall_alpha | Overall alpha for source image (0..255).
  | check_x | The X offset for the checkboard (origin of checkboard is at - check_x , - check_y ).
  | check_y | The Y offset for the checkboard.
  | check_size | The size of checks in the checkboard (must be a power of two).
  | color1 | The color of check at upper left.
  | color2 | The color of the other check.

Glib::RefPtr<Gdk::Pixbuf> Gdk::Pixbuf::composite_color_simple | ( | int | dest_width,
|  | int | dest_height,
|  | InterpType | interp_type,
|  | int | overall_alpha,
|  | int | check_size,
|  | guint32 | color1,
|  | guint32 | color2 |
| ) |  |  | const

Creates a new Gdk::Pixbuf by scaling src to dest_width x dest_height and compositing the result with a checkboard of colors color1 and color2 .

Parameters:

  | dest_width | The width of destination image.
  | dest_height | The height of destination image.
  | interp_type | The interpolation type for the transformation.
  | overall_alpha | Overall alpha for source image (0..255).
  | check_size | The size of checks in the checkboard (must be a power of two).
  | color1 | The color of check at upper left.
  | color2 | The color of the other check.

Returns:
  The new Gdk::Pixbuf, or `0` if not enough memory could be allocated for it.

Glib::RefPtr<Pixbuf> Gdk::Pixbuf::copy | ( |  | ) | const

Creates a new Gdk::Pixbuf with a copy of the information in the specified pixbuf .

Returns:
  A newly-created pixbuf with a reference count of 1, or `0` if not enough memory could be allocated.

void Gdk::Pixbuf::copy_area | ( | int | src_x,
|  | int | src_y,
|  | int | width,
|  | int | height,
|  | const Glib::RefPtr<Gdk::Pixbuf>& | dest_pixbuf,
|  | int | dest_x,
|  | int | dest_y |
| ) |  |  | const

Copies a rectangular area from src_pixbuf to dest_pixbuf .

Conversion of pixbuf formats is done automatically.

Parameters:

  | src_x | Source X coordinate within src_pixbuf .
  | src_y | Source Y coordinate within src_pixbuf .
  | width | Width of the area to copy.
  | height | Height of the area to copy.
  | dest_pixbuf | Destination pixbuf.
  | dest_x | X coordinate within dest_pixbuf .
  | dest_y | Y coordinate within dest_pixbuf .

static Glib::RefPtr<Pixbuf> Gdk::Pixbuf::create | ( | Colorspace | colorspace,
|  | bool | has_alpha,
|  | int | bits_per_sample,
|  | int | width,
|  | int | height |
| ) |  |  | `[static]`

Creates a new Gdk::Pixbuf structure and allocates a buffer for it.

The buffer has an optimal rowstride. Note that the buffer is not cleared; you will have to fill it completely yourself.

Parameters:

  | colorspace | Color space for image.
  | has_alpha | Whether the image should have transparency information.
  | bits_per_sample | Number of bits per color sample.
  | width | Width of image in pixels, must be > 0.
  | height | Height of image in pixels, must be > 0.

Returns:
  A newly-created Gdk::Pixbuf with a reference count of 1, or `0` if not enough memory could be allocated for the image buffer.

static Glib::RefPtr<Pixbuf> Gdk::Pixbuf::create | ( | const Glib::RefPtr<Image>& | src,
|  | int | src_x,
|  | int | src_y,
|  | int | width,
|  | int | height |
| ) |  |  | `[static]`

Creates a pixbuf object from an image, using the colormap from the image.

Parameters:

  | src | Source Image.
  | src_x | Source X coordinate within the image.
  | src_y | Source Y coordinate within the image.
  | width | Width in pixels of region to get.
  | height | Height in pixels of region to get.

static Glib::RefPtr<Pixbuf> Gdk::Pixbuf::create | ( | const Glib::RefPtr<Image>& | src,
|  | const Glib::RefPtr<Colormap>& | cmap,
|  | int | src_x,
|  | int | src_y,
|  | int | width,
|  | int | height |
| ) |  |  | `[static]`

Creates a pixbuf object from an image.

Parameters:

  | src | Source Image.
  | cmap | A colormap.
  | src_x | Source X coordinate within the image.
  | src_y | Source Y coordinate within the image.
  | width | Width in pixels of region to get.
  | height | Height in pixels of region to get.

Since gtkmm 2.12:

static Glib::RefPtr<Pixbuf> Gdk::Pixbuf::create | ( | const Glib::RefPtr<Drawable>& | src,
|  | int | src_x,
|  | int | src_y,
|  | int | width,
|  | int | height |
| ) |  |  | `[static]`

Creates a pixbuf object from a drawable, using the colormap from the drawable.

Parameters:

  | src | Source drawable.
  | src_x | Source X coordinate within drawable.
  | src_y | Source Y coordinate within drawable.
  | width | Width in pixels of region to get.
  | height | Height in pixels of region to get.

Since gtkmm 2.12:

static Glib::RefPtr<Pixbuf> Gdk::Pixbuf::create | ( | const Glib::RefPtr<Drawable>& | src,
|  | const Glib::RefPtr<Colormap>& | cmap,
|  | int | src_x,
|  | int | src_y,
|  | int | width,
|  | int | height |
| ) |  |  | `[static]`

Creates a pixbuf object from a drawable.

Transfers image data from a Drawable and converts it to an RGB(A) representation inside a Pixbuf. In other words, copies image data from a server-side drawable to a client-side RGB(A) buffer. This allows you to efficiently read individual pixels on the client side.

If the drawable has no colormap (See Gdk::Drawable::get_colormap()), then a suitable colormap must be specified. Otherwise, you may use the constructor that takes no colormap argument. Typically a Gdk::Window or a pixmap created by passing a Gdk:Window to the Gdk::Pixbuf constructor will already have a colormap associated with it. If the drawable is a bitmap (1 bit per pixel pixmap), then a colormap is not required; pixels with a value of 1 are assumed to be white, and pixels with a value of 0 are assumed to be black. For taking screenshots, Gdk::Colormap::get_system() returns the correct colormap to use.

This will create an RGB pixbuf with 8 bits per channel and no alpha, with the same size specified by the width and height arguments.

If the specified drawable is a pixmap, then the requested source rectangle must be completely contained within the pixmap, otherwise the constructor will fail. For pixmaps only (not for windows) passing -1 for width or height is allowed to mean the full width or height of the pixmap.

If the specified drawable is a window, and the window is off the screen, then there is no image data in the obscured/offscreen regions to be placed in the pixbuf. The contents of portions of the pixbuf corresponding to the offscreen region are undefined.

If the window you're obtaining data from is partially obscured by other windows, then the contents of the pixbuf areas corresponding to the obscured regions are undefined.

See alo Gdk::Drawable::get_image().

Parameters:

  | src | Source drawable.
  | cmap,: | A colormap.
  | src_x | Source X coordinate within drawable.
  | src_y | Source Y coordinate within drawable.
  | width | Width in pixels of region to get.
  | height | Height in pixels of region to get.

Since gtkmm 2.12:

static Glib::RefPtr<Pixbuf> Gdk::Pixbuf::create | ( | const Glib::RefPtr<Image>& | src,
|  | const Glib::RefPtr<Colormap>& | cmap,
|  | int | src_x,
|  | int | src_y,
|  | int | dest_x,
|  | int | dest_y,
|  | int | width,
|  | int | height |
| ) |  |  | `[static]`

Deprecated:
  Use the create() methods that that don't have the unused dest_x and dest_y parameters.

static Glib::RefPtr<Pixbuf> Gdk::Pixbuf::create | ( | const Glib::RefPtr<Drawable>& | src,
|  | const Glib::RefPtr<Colormap>& | cmap,
|  | int | src_x,
|  | int | src_y,
|  | int | dest_x,
|  | int | dest_y,
|  | int | width,
|  | int | height |
| ) |  |  | `[static]`

Deprecated:
  Use the create() methods that don't have the unused dest_x and dest_y parameters.

static Glib::RefPtr<Pixbuf> Gdk::Pixbuf::create_from_data | ( | const guint8 * | data,
|  | Colorspace | colorspace,
|  | bool | has_alpha,
|  | int | bits_per_sample,
|  | int | width,
|  | int | height,
|  | int | rowstride,
|  | const SlotDestroyData& | destroy_slot |
| ) |  |  | `[static]`

Creates a new Gdk::Pixbuf out of in-memory image data.

Currently only RGB images with 8 bits per sample are supported.

Parameters:

  | data | Image data in 8-bit/sample packed format.
  | colorspace | Colorspace for the image data.
  | has_alpha | Whether the data has an opacity channel.
  | bits_per_sample | Number of bits per sample.
  | width | Width of the image in pixels.
  | height | Height of the image in pixels.
  | rowstride | Distance in bytes between rows.
  | destroy_slot | Slot used to free the data when the pixbuf's reference count drops to zero.

Returns:
  A newly-created Gdk::Pixbuf object.

static Glib::RefPtr<Pixbuf> Gdk::Pixbuf::create_from_data | ( | const guint8 * | data,
|  | Colorspace | colorspace,
|  | bool | has_alpha,
|  | int | bits_per_sample,
|  | int | width,
|  | int | height,
|  | int | rowstride |
| ) |  |  | `[static]`

Creates a new Gdk::Pixbuf out of in-memory image data.

Currently only RGB images with 8 bits per sample are supported.

Parameters:

  | data | Image data in 8-bit/sample packed format.
  | colorspace | Colorspace for the image data.
  | has_alpha | Whether the data has an opacity channel.
  | bits_per_sample | Number of bits per sample.
  | width | Width of the image in pixels.
  | height | Height of the image in pixels.
  | rowstride | Distance in bytes between rows.

Returns:
  A newly-created Gdk::Pixbuf object.

static Glib::RefPtr<Pixbuf> Gdk::Pixbuf::create_from_file | ( | const std::string & | filename,
|  | int | width,
|  | int | height,
|  | bool | preserve_aspect_ratio = `true` |
| ) |  |  | `[static]`

Creates a new pixbuf by loading an image from a file.

The file format is detected automatically. If `0` is returned, then error will be set. Possible errors are in the Gdk::PIXBUF_ERROR and G::FILE_ERROR domains. The image will be scaled to fit in the requested size, optionally preserving the image's aspect ratio.

When preserving the aspect ratio, a width of -1 will cause the image to be scaled to the exact given height, and a height of -1 will cause the image to be scaled to the exact given width. When not preserving aspect ratio, a width or height of -1 means to not scale the image at all in that dimension. Negative values for width and height are allowed since 2.8.

Parameters:

  | filename | Name of file to load, in the GLib file name encoding.
  | width | The width the image should have or -1 to not constrain the width.
  | height | The height the image should have or -1 to not constrain the height.
  | preserve_aspect_ratio | `true` to preserve the image's aspect ratio.
  | error | Return location for an error.

Returns:
  A newly-created pixbuf with a reference count of 1, or `0` if any of several error conditions occurred: the file could not be opened, there was no loader for the file's format, there was not enough memory to allocate the image buffer, or the image file contained invalid data.

Since gtkmm 2.6:

static Glib::RefPtr<Pixbuf> Gdk::Pixbuf::create_from_file | ( | const std::string & | filename | ) | `[static]`

Creates a new pixbuf by loading an image from a file.

The file format is detected automatically. If `0` is returned, then error will be set. Possible errors are in the Gdk::PIXBUF_ERROR and G::FILE_ERROR domains.

Parameters:

  | filename | Name of file to load, in the GLib file name encoding.
  | error | Return location for an error.

Returns:
  A newly-created pixbuf with a reference count of 1, or `0` if any of several error conditions occurred: the file could not be opened, there was no loader for the file's format, there was not enough memory to allocate the image buffer, or the image file contained invalid data.

static Glib::RefPtr<Pixbuf> Gdk::Pixbuf::create_from_inline | ( | int | data_length,
|  | const guint8 * | data,
|  | bool | copy_pixels = `false` |
| ) |  |  | `[static]`

Create a Gdk::Pixbuf from a flat representation that is suitable for storing as inline data in a program.

This is useful if you want to ship a program with images, but don't want to depend on any external files.

GTK+ ships with a program called <command>gdk-pixbuf-csource</command> which allows for conversion of Gdk::Pixbufs into such a inline representation. In almost all cases, you should pass the <option>--raw</option> flag to <command>gdk-pixbuf-csource</command>. A sample invocation would be:

     gdk-pixbuf-csource --raw --name=myimage_inline myimage.png

For the typical case where the inline pixbuf is read-only static data, you don't need to copy the pixel data unless you intend to write to it, so you can pass `false` for copy_pixels . (If you pass <option>--rle</option> to <command>gdk-pixbuf-csource</command>, a copy will be made even if copy_pixels is `false`, so using this option is generally a bad idea.)

If you create a pixbuf from const inline data compiled into your program, it's probably safe to ignore errors and disable length checks, since things will always succeed:

     pixbuf = gdk_pixbuf_new_from_inline (-1, myimage_inline, <tt>false</tt>, <tt>0</tt>);

For non-const inline data, you could get out of memory. For untrusted inline data located at runtime, you could have corrupt inline data in addition.

Parameters:

  | data_length | Length in bytes of the data argument or -1 to disable length checks.
  | data | Byte data containing a serialized Gdk::Pixdata structure.
  | copy_pixels | Whether to copy the pixel data, or use direct pointers data for the resulting pixbuf.
  | error | G::Error return location, may be `0` to ignore errors.

Returns:
  A newly-created Gdk::Pixbuf structure with a reference, count of 1, or `0` if an error occurred.

static Glib::RefPtr<Pixbuf> Gdk::Pixbuf::create_from_xpm_data | ( | const char *const * | data | ) | `[static]`

Creates a new pixbuf by parsing XPM data in memory.

This data is commonly the result of including an XPM file into a program's C source.

Parameters:

  | data | Pointer to inline XPM data.

Returns:
  A newly-created pixbuf with a reference count of 1.

static Glib::RefPtr<Pixbuf> Gdk::Pixbuf::create_subpixbuf | ( | const Glib::RefPtr<Pixbuf>& | src_pixbuf,
|  | int | src_x,
|  | int | src_y,
|  | int | width,
|  | int | height |
| ) |  |  | `[static]`

Creates a new pixbuf which represents a sub-region of src_pixbuf .

The new pixbuf shares its pixels with the original pixbuf, so writing to one affects both. The new pixbuf holds a reference to src_pixbuf , so src_pixbuf will not be finalized until the new pixbuf is finalized.

Parameters:

  | src_pixbuf | A Gdk::Pixbuf.
  | src_x | X coord in src_pixbuf .
  | src_y | Y coord in src_pixbuf .
  | width | Width of region in src_pixbuf .
  | height | Height of region in src_pixbuf .

Returns:
  A new pixbuf.

void Gdk::Pixbuf::fill | ( | guint32 | pixel | ) |

Clears a pixbuf to the given RGBA value, converting the RGBA value into the pixbuf's pixel format.

The alpha will be ignored if the pixbuf doesn't have an alpha channel.

Parameters:

  | pixel | RGBA pixel to clear to (0xffffffff is opaque white, 0x00000000 transparent black).

Glib::RefPtr<Gdk::Pixbuf> Gdk::Pixbuf::flip | ( | bool | horizontal = `true` | ) | const

Flips a pixbuf horizontally or vertically and returns the result in a new pixbuf.

Parameters:

  | horizontal | `true` to flip horizontally, `false` to flip vertically.

Returns:
  The new Gdk::Pixbuf, or `0` if not enough memory could be allocated for it.

Since gtkmm 2.6:

int Gdk::Pixbuf::get_bits_per_sample | ( |  | ) | const

Queries the number of bits per color sample in a pixbuf.

Returns:
  Number of bits per color sample.

Colorspace Gdk::Pixbuf::get_colorspace | ( |  | ) | const

Queries the color space of a pixbuf.

Returns:
  Color space.

static SListHandle_PixbufFormat Gdk::Pixbuf::get_formats | ( |  | ) | `[static]`

bool Gdk::Pixbuf::get_has_alpha | ( |  | ) | const

Queries whether a pixbuf has an alpha channel (opacity information).

Returns:
  `true` if it has an alpha channel, `false` otherwise.

int Gdk::Pixbuf::get_height | ( |  | ) | const

Queries the height of a pixbuf.

Returns:
  Height in pixels.

int Gdk::Pixbuf::get_n_channels | ( |  | ) | const

Queries the number of channels of a pixbuf.

Returns:
  Number of channels.

Glib::ustring Gdk::Pixbuf::get_option | ( | const Glib::ustring & | key | ) | const

Looks up key in the list of options that may have been attached to the pixbuf when it was loaded, or that may have been attached by another function using set_option().

For instance, the ANI loader provides "Title" and "Artist" options. The ICO, XBM, and XPM loaders provide "x_hot" and "y_hot" hot-spot options for cursor definitions. The PNG loader provides the tEXt ancillary chunk key/value pairs as options. Since 2.12, the TIFF and JPEG loaders return an "orientation" option string that corresponds to the embedded TIFF/Exif orientation tag (if present).

Parameters:

  | key | A nul-terminated string.

Returns:
  The value associated with key . This is a nul-terminated string that should not be freed or `0` if key was not found.

guint8* Gdk::Pixbuf::get_pixels | ( |  | ) | const

Queries a pointer to the pixel data of a pixbuf.

Returns:
  A pointer to the pixbuf's pixel data. Please see <xref linkend="image-data"/> for information about how the pixel data is stored in memory.

int Gdk::Pixbuf::get_rowstride | ( |  | ) | const

Queries the rowstride of a pixbuf, which is the number of bytes between the start of a row and the start of the next row.

Returns:
  Distance between row starts.

int Gdk::Pixbuf::get_width | ( |  | ) | const

Queries the width of a pixbuf.

Returns:
  Width in pixels.

const GdkPixbuf* Gdk::Pixbuf::gobj | ( |  | ) | const`[inline]`

Provides access to the underlying C GObject.

Reimplemented from Glib::ObjectBase.

GdkPixbuf* Gdk::Pixbuf::gobj | ( |  | ) | `[inline]`

Provides access to the underlying C GObject.

Reimplemented from Glib::ObjectBase.

GdkPixbuf* Gdk::Pixbuf::gobj_copy | ( |  | ) |

Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.

void Gdk::Pixbuf::render_pixmap_and_mask | ( | Glib::RefPtr<Pixmap>& | pixmap_return,
|  | Glib::RefPtr<Bitmap>& | mask_return,
|  | int | alpha_threshold |
| ) |  |  |

void Gdk::Pixbuf::render_pixmap_and_mask_for_colormap | ( | const Glib::RefPtr<Colormap>& | colormap,
|  | Glib::RefPtr<Pixmap>& | pixmap_return,
|  | Glib::RefPtr<Bitmap>& | mask_return,
|  | int | alpha_threshold |
| ) |  |  |

void Gdk::Pixbuf::render_threshold_alpha | ( | const Glib::RefPtr<Gdk::Bitmap>& | bitmap,
|  | int | src_x,
|  | int | src_y,
|  | int | dest_x,
|  | int | dest_y,
|  | int | width,
|  | int | height,
|  | int | alpha_threshold |
| ) |  |  |

Takes the opacity values in a rectangular portion of a pixbuf and thresholds them to produce a bi-level alpha mask that can be used as a clipping mask for a drawable.

Parameters:

  | bitmap | Bitmap where the bilevel mask will be painted to.
  | src_x | Source X coordinate.
  | src_y | Source Y coordinate.
  | dest_x | Destination X coordinate.
  | dest_y | Destination Y coordinate.
  | width | Width of region to threshold, or -1 to use pixbuf width.
  | height | Height of region to threshold, or -1 to use pixbuf height.
  | alpha_threshold | Opacity values below this will be painted as zero; all other values will be painted as one.

void Gdk::Pixbuf::render_to_drawable | ( | const Glib::RefPtr<Drawable>& | drawable,
|  | const Glib::RefPtr<Gdk::GC>& | gc,
|  | int | src_x,
|  | int | src_y,
|  | int | dest_x,
|  | int | dest_y,
|  | int | width,
|  | int | height,
|  | RgbDither | dither,
|  | int | x_dither,
|  | int | y_dither |
| ) |  |  |

Renders a rectangular portion of a pixbuf to a drawable while using the specified GC.

This is done using GdkRGB, so the specified drawable must have the GdkRGB visual and colormap. Note that this function will ignore the opacity information for images with an alpha channel; the GC must already have the clipping mask set if you want transparent regions to show through.

For an explanation of dither offsets, see the GdkRGB documentation. In brief, the dither offset is important when re-rendering partial regions of an image to a rendered version of the full image, or for when the offsets to a base position change, as in scrolling. The dither matrix has to be shifted for consistent visual results. If you do not have any of these cases, the dither offsets can be both zero.

Deprecated: 2.4: This function is obsolete. Use gdk_draw_pixbuf() instead.

Parameters:

  | drawable | Destination drawable.
  | gc | GC used for rendering.
  | src_x | Source X coordinate within pixbuf.
  | src_y | Source Y coordinate within pixbuf.
  | dest_x | Destination X coordinate within drawable.
  | dest_y | Destination Y coordinate within drawable.
  | width | Width of region to render, in pixels, or -1 to use pixbuf width.
  | height | Height of region to render, in pixels, or -1 to use pixbuf height.
  | dither | Dithering mode for GdkRGB.
  | x_dither | X offset for dither.
  | y_dither | Y offset for dither.

void Gdk::Pixbuf::render_to_drawable_alpha | ( | const Glib::RefPtr<Drawable>& | drawable,
|  | int | src_x,
|  | int | src_y,
|  | int | dest_x,
|  | int | dest_y,
|  | int | width,
|  | int | height,
|  | PixbufAlphaMode | alpha_mode,
|  | int | alpha_threshold,
|  | RgbDither | dither,
|  | int | x_dither,
|  | int | y_dither |
| ) |  |  |

Renders a rectangular portion of a pixbuf to a drawable.

The destination drawable must have a colormap. All windows have a colormap, however, pixmaps only have colormap by default if they were created with a non-`0` window argument. Otherwise a colormap must be set on them with gdk_drawable_set_colormap.

On older X servers, rendering pixbufs with an alpha channel involves round trips to the X server, and may be somewhat slow.

Deprecated: 2.4: This function is obsolete. Use gdk_draw_pixbuf() instead.

Parameters:

  | drawable | Destination drawable.
  | src_x | Source X coordinate within pixbuf.
  | src_y | Source Y coordinates within pixbuf.
  | dest_x | Destination X coordinate within drawable.
  | dest_y | Destination Y coordinate within drawable.
  | width | Width of region to render, in pixels, or -1 to use pixbuf width.
  | height | Height of region to render, in pixels, or -1 to use pixbuf height.
  | alpha_mode | Ignored. Present for backwards compatibility.
  | alpha_threshold | Ignored. Present for backwards compatibility.
  | dither | Dithering mode for GdkRGB.
  | x_dither | X offset for dither.
  | y_dither | Y offset for dither.

Glib::RefPtr<Gdk::Pixbuf> Gdk::Pixbuf::rotate_simple | ( | PixbufRotation | angle | ) | const

Rotates a pixbuf by a multiple of 90 degrees, and returns the result in a new pixbuf.

Parameters:

  | angle | The angle to rotate by.

Returns:
  The new Gdk::Pixbuf, or `0` if not enough memory could be allocated for it.

Since gtkmm 2.6:

void Gdk::Pixbuf::saturate_and_pixelate | ( | const Glib::RefPtr<Gdk::Pixbuf>& | dest,
|  | float | saturation,
|  | bool | pixelate |
| ) |  |  | const

Modifies saturation and optionally pixelates src , placing the result in dest .

src and dest may be the same pixbuf with no ill effects. If saturation is 1.0 then saturation is not changed. If it's less than 1.0, saturation is reduced (the image turns toward grayscale); if greater than 1.0, saturation is increased (the image gets more vivid colors). If pixelate is `true`, then pixels are faded in a checkerboard pattern to create a pixelated image. src and dest must have the same image format, size, and rowstride.

Parameters:

  | dest | Place to write modified version of src .
  | saturation | Saturation factor.
  | pixelate | Whether to pixelate.

void Gdk::Pixbuf::save | ( | const std::string & | filename,
|  | const Glib::ustring & | type,
|  | const Glib::StringArrayHandle & | option_keys,
|  | const Glib::StringArrayHandle & | option_values |
| ) |  |  |

Saves pixbuf to a file in format type.

By default, "jpeg", "png", "ico" and "bmp" are possible file formats to save in, but more formats may be installed. TThe list of all writable formats can be determined by using Gdk::Pixbuf::get_formats() with Gdk::PixbufFormat::is_writable().

The option_keys and , if not empty, should contain pairs of strings that modify the save parameters. For example, "quality", "100".

Currently only a few parameters exist. JPEG images can be saved with a "quality" parameter; its value should be in the range [0,100]. Text chunks can be attached to PNG images by specifying parameters of the form "tEXt::key", where key is an ASCII string of length 1-79. The values are UTF-8 encoded strings. ICO images can be saved in depth 16, 24, or 32, by using the "depth" parameter. When the ICO saver is given "x_hot" and "y_hot" parameters, it produces a CUR instead of an ICO.

Parameters:

  | filename | The path of the file to be created.
  | type | The file type.
  | option_keys |
  | option_values |

Exceptions:

  | Glib::FileError |
  | Gdk::PixbufError |

void Gdk::Pixbuf::save | ( | const std::string & | filename,
|  | const Glib::ustring & | type |
| ) |  |  |

Saves pixbuf to a file in format type.

By default, "jpeg", "png", "ico" and "bmp" are possible file formats to save in, but more formats may be installed. TThe list of all writable formats can be determined by using Gdk::Pixbuf::get_formats() with Gdk::PixbufFormat::is_writable().

Parameters:

  | filename | The path of the file to be created.
  | type | The file type.

Exceptions:

  | Glib::FileError |
  | Gdk::PixbufError |

void Gdk::Pixbuf::save_to_buffer | ( | gchar *& | buffer,
|  | gsize & | buffer_size,
|  | const Glib::ustring & | type,
|  | const Glib::StringArrayHandle & | option_keys,
|  | const Glib::StringArrayHandle & | option_values |
| ) |  |  |

void Gdk::Pixbuf::save_to_buffer | ( | gchar *& | buffer,
|  | gsize & | buffer_size,
|  | const Glib::ustring & | type = `"png"` |
| ) |  |  |

void Gdk::Pixbuf::scale | ( | const Glib::RefPtr<Gdk::Pixbuf>& | dest,
|  | int | dest_x,
|  | int | dest_y,
|  | int | dest_width,
|  | int | dest_height,
|  | double | offset_x,
|  | double | offset_y,
|  | double | scale_x,
|  | double | scale_y,
|  | InterpType | interp_type |
| ) |  |  | const

Creates a transformation of the source image src by scaling by scale_x and scale_y then translating by offset_x and offset_y , then renders the rectangle ( dest_x , dest_y , dest_width , dest_height ) of the resulting image onto the destination image replacing the previous contents.

Try to use scale_simple() first, this function is the industrial-strength power tool you can fall back to if scale_simple() isn't powerful enough.

Parameters:

  | dest | The Gdk::Pixbuf into which to render the results.
  | dest_x | The left coordinate for region to render.
  | dest_y | The top coordinate for region to render.
  | dest_width | The width of the region to render.
  | dest_height | The height of the region to render.
  | offset_x | The offset in the X direction (currently rounded to an integer).
  | offset_y | The offset in the Y direction (currently rounded to an integer).
  | scale_x | The scale factor in the X direction.
  | scale_y | The scale factor in the Y direction.
  | interp_type | The interpolation type for the transformation.

Glib::RefPtr<Gdk::Pixbuf> Gdk::Pixbuf::scale_simple | ( | int | dest_width,
|  | int | dest_height,
|  | InterpType | interp_type |
| ) |  |  | const

Create a new Gdk::Pixbuf containing a copy of src scaled to dest_width x dest_height .

Leaves src unaffected. interp_type should be Gdk::INTERP_NEAREST if you want maximum speed (but when scaling down Gdk::INTERP_NEAREST is usually unusably ugly). The default interp_type should be Gdk::INTERP_BILINEAR which offers reasonable quality and speed.

You can scale a sub-portion of src by creating a sub-pixbuf pointing into src ; see new_subpixbuf().

For more complicated scaling/compositing see scale() and composite().

Parameters:

  | dest_width | The width of destination image.
  | dest_height | The height of destination image.
  | interp_type | The interpolation type for the transformation.

Returns:
  The new Gdk::Pixbuf, or `0` if not enough memory could be allocated for it.

## Friends And Related Function Documentation

Glib::RefPtr<Gdk::Pixbuf> wrap | ( | GdkPixbuf * | object,
|  | bool | take_copy = `false` |
| ) |  |  | `[related]`

A Glib::wrap() method for this object.

Parameters:

  | object | The C instance.
  | take_copy | False if the result should take ownership of the C instance. True if it should take a new copy or ref.

Returns:
  A C++ instance that wraps this C instance.

The documentation for this class was generated from the following file:

- pixbuf.h