/usr/share/ada/adainclude/gtkada/gdk-pixbuf.ads is in libgtkada16.1.0-dev 17.0.2017-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- GtkAda - Ada95 binding for Gtk+/Gnome --
-- --
-- Copyright (C) 2000-2017, AdaCore --
-- --
-- This library is free software; you can redistribute it and/or modify it --
-- under terms of the GNU General Public License as published by the Free --
-- Software Foundation; either version 3, or (at your option) any later --
-- version. This library is distributed in the hope that it will be useful, --
-- but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHAN- --
-- TABILITY or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- --
-- --
-- --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
------------------------------------------------------------------------------
-- <description>
-- This object provides image manipulation routines.
--
-- The following image formats are known, but some depend on external
-- libraries for the proper loading of files (indicated with * in the list):
-- PNG*, JPEG*, TIFF*, GIF, XPM, PNM, Sun raster file (ras), ico,
-- bmp.
--
-- With this package, you can load images from file, display them on the
-- screen, re-scale them and compose them with other images.
-- All the functions fully support alpha channels (opacity).
--
-- Different filters are provided, depending on the quality of output you
-- expect and the speed you need.
-- </description>
-- <c_version>1.3.11</c_version>
-- <group>Gdk, the low-level API</group>
-- <testgtk>create_pixbuf.adb</testgtk>
with Interfaces.C.Strings;
with System;
with Cairo;
with Glib; use Glib;
with Glib.Error; use Glib.Error;
with Glib.Object;
with Gdk.Display;
package Gdk.Pixbuf is
type Gdk_Pixbuf_Record is new Glib.Object.GObject_Record with private;
type Gdk_Pixbuf is access all Gdk_Pixbuf_Record'Class;
-- A very efficient client-side pixmap.
-- This type can be adapted to all the possible screen depths (number of
-- bits per pixel), and the algorithms are extremely efficient.
-- You can also load a pixbuf directly from an external file in one of
-- the standard image formats.
Null_Pixbuf : constant Gdk_Pixbuf := null;
type Gdk_Pixbuf_Animation is new Glib.C_Proxy;
-- Type used for animations.
type Gdk_Pixbuf_Animation_Iter is new Glib.C_Proxy;
-- Type used to iterate through an animation.
type Alpha_Mode is (Alpha_Bilevel, Alpha_Full);
-- Alpha compositing mode.
-- This indicates how the alpha channel (for opacity) is handled when
-- rendering.
pragma Convention (C, Alpha_Mode);
type Gdk_Colorspace is (Colorspace_RGB);
-- Type of the image.
-- The only possible value is currently RGB, but extensions will
-- exist with CMYK, Gray, Lab, ...
pragma Convention (C, Gdk_Colorspace);
type Gdk_Interp_Type is
(Interp_Nearest,
-- Nearest neighbor. It is the fastest and lowest quality.
Interp_Tiles,
-- Accurate simulation of the Postscript image operator
-- without any interpolation enabled; each pixel is rendered as a tiny
-- parallelogram of solid color, the edges of which are implemented
-- with anti-aliasing. It resembles nearest neighbor for enlargement,
-- and bilinear for reduction.
Interp_Bilinear,
-- Bilinear interpolation. For enlargement, it is equivalent to
-- point-sampling the ideal bilinear-interpolated image. For reduction,
-- it is equivalent to laying down small tiles and integrating over the
-- coverage area.
Interp_Hyper
-- Filter_Hyper is the highest quality reconstruction function. It is
-- derived from the hyperbolic filters in Wolberg's "Digital Image
-- Warping," and is formally defined as the hyperbolic-filter sampling
-- the ideal hyperbolic-filter interpolated image (the filter is
-- designed to be idempotent for 1:1 pixel mapping). It is the slowest
-- and highest quality.
);
-- Interpolation methods.
pragma Convention (C, Gdk_Interp_Type);
------------
-- Errors --
------------
-- Errors defined in the Pixbuf_Error domain:
Corrupt_Image : constant := 0;
-- image data hosed
Insufficient_Memory : constant := 1;
-- no mem to load image
Bad_Option : constant := 2;
-- bad option passed to save routine
Unknown_Type : constant := 3;
-- unsupported image type
Unsupported_Operation : constant := 4;
-- unsupported operation (load, save) for image type
Failed : constant := 5;
-- Operation failed.
type File_Format is (JPEG, PNG, ICO, BMP);
-- Possible formats when saving a file.
type Image_Quality is range 0 .. 100;
-- For a JPEG image only, quality of the image in percentage.
type Alpha_Range is range 0 .. 255;
-- Valid values for alpha parameters.
pragma Convention (C, Alpha_Range);
type Gdk_Rgb_Dither is (Dither_None, Dither_Normal, Dither_Max);
-- The three kinds of dithering that are implemented in this package:
-- - Dither_None: No dithering will be done
-- - Dither_Normal: Specifies dithering on 8 bit displays, but not 16-bit.
-- Usually the best choice.
-- - Dither_Max: Specifies dithering on every kind of display
for Gdk_Rgb_Dither'Size use Glib.Gint'Size;
type Rgb_Record is record
Red, Green, Blue : Glib.Guchar;
end record;
pragma Convention (C, Rgb_Record);
-- This is the buffer that will contain the image. You can manipulate each
-- byte in it independantly, although there is no high level routine
-- to draw lines, circles, ...
-- Once you are done drawing into this buffer, you can copy it to any
-- drawable on the screen, *if* the widget was created with the correct
-- visual and colormap (see above).
type Unchecked_Rgb_Buffer is array (Glib.Guint) of Rgb_Record;
pragma Convention (C, Unchecked_Rgb_Buffer);
type Rgb_Buffer_Access is access all Unchecked_Rgb_Buffer;
pragma Convention (C, Rgb_Buffer_Access);
-- Type used By Get_Pixels to return an array with no
-- bound checks that is compatible with C (also known as a flat array).
--------------
-- Get_Type --
--------------
function Get_Type return Glib.GType;
-- Return the internal value associated with a Gdk_Pixbuf.
--------------------------
-- Accessing the fields --
--------------------------
function Get_Colorspace (Pixbuf : Gdk_Pixbuf) return Gdk_Colorspace;
-- Query the color space of a pixbuf.
function Get_N_Channels (Pixbuf : Gdk_Pixbuf) return Gint;
-- Number of channels in the image.
function Get_Has_Alpha (Pixbuf : Gdk_Pixbuf) return Boolean;
-- Return True if the image has an alpha channel (opacity information).
function Get_Bits_Per_Sample (Pixbuf : Gdk_Pixbuf) return Gint;
-- Number of bits per color sample.
function Get_Pixels (Pixbuf : Gdk_Pixbuf) return Rgb_Buffer_Access;
-- Return a pointer to the pixel data of the image.
function Get_Width (Pixbuf : Gdk_Pixbuf) return Gint;
-- Return the width of the image in pixels.
function Get_Height (Pixbuf : Gdk_Pixbuf) return Gint;
-- Return the height of the image in pixels.
function Get_Rowstride (Pixbuf : Gdk_Pixbuf) return Gint;
-- Return the number of bytes between rows in the image data.
--------------
-- Creating --
--------------
function Gdk_New
(Colorspace : Gdk_Colorspace := Colorspace_RGB;
Has_Alpha : Boolean := False;
Bits_Per_Sample : Gint := 8;
Width : Gint;
Height : Gint) return Gdk_Pixbuf;
-- Create a blank pixbuf with an optimal row stride and a new buffer.
-- The buffer is allocated, but not cleared.
-- The reference counting is initialized to 1.
function Copy (Pixbuf : Gdk_Pixbuf) return Gdk_Pixbuf;
-- Copy a pixbuf.
function Gdk_New_Subpixbuf
(Src_Pixbuf : Gdk_Pixbuf;
Src_X : Gint;
Src_Y : Gint;
Width : Gint;
Height : Gint) return Gdk_Pixbuf;
-- Create a pixbuf which points to the pixels of another pixbuf
procedure Gdk_New_From_File
(Pixbuf : out Gdk_Pixbuf;
Filename : String;
Error : out GError);
-- Load an image from file.
function Gdk_New_From_Data
(Data : Guchar_Array_Access;
Colorspace : Gdk_Colorspace := Colorspace_RGB;
Has_Alpha : Boolean := False;
Bits_Per_Sample : Gint := 8;
Width : Gint;
Height : Gint;
Rowstride : Gint;
Auto_Destroy_Data : Boolean := True) return Gdk_Pixbuf;
-- Create a pixbuf out of in-memory image data.
-- Currently only RGB images with 8 bits per sample are supported.
-- Width and Height must be > 0.
-- Rowstride is the distance in bytes between row starts.
-- A typical value is 4*Width when there is an Alpha channel.
-- If Auto_Destroy_Data is true, passed data will be automatically
-- freed when the reference count of the pixbuf reaches 1.
-- Otherwise, data is never freed.
function Gdk_New_From_Xpm_Data
(Data : Interfaces.C.Strings.chars_ptr_array) return Gdk_Pixbuf;
-- Create an image from a XPM data.
procedure Fill (Pixbuf : Gdk_Pixbuf; Pixel : Guint32);
-- Fill pixbuf with a given pixel value.
procedure Save
(Pixbuf : Gdk_Pixbuf;
Filename : String;
Format : File_Format;
Error : out GError;
Quality : Image_Quality := Image_Quality'Last;
Depth : Integer := 32);
-- Save pixbuf to a file.
-- Quality is only taken into account for JPEG images.
-- Depth is only taken into account for ICO images and can take the values
-- 16, 24 or 32.
-- Error is set to null on success, and set to a GError otherwise.
function Add_Alpha
(Pixbuf : Gdk_Pixbuf;
Substitute_Color : Boolean := False;
Red : Guchar := 0;
Green : Guchar := 0;
Blue : Guchar := 0) return Gdk_Pixbuf;
-- Add an alpha channel.
-- Return a newly allocated image copied from Pixbuf, but with an
-- extra alpha channel.
-- If Pixbuf already had an alpha channel, the two images have exactly
-- the same contents.
-- If Substitute_Color is True, the color (Red, Green, Blue) is
-- substituted for zero opacity.
-- If Substitute_Color is False, Red, Green and Blue are ignored, and a
-- new color is created with zero opacity.
procedure Copy_Area
(Src_Pixbuf : Gdk_Pixbuf;
Src_X : Gint;
Src_Y : Gint;
Width : Gint;
Height : Gint;
Dest_Pixbuf : Gdk_Pixbuf;
Dest_X : Gint;
Dest_Y : Gint);
-- Copy a rectangular area from Src_pixbuf to Dest_pixbuf.
-- Conversion of pixbuf formats is done automatically.
procedure Saturate_And_Pixelate
(Src : Gdk_Pixbuf;
Dest : Gdk_Pixbuf;
Saturation : Gfloat;
Pixelate : Boolean := True);
-- Brighten/darken and optionally make it pixelated-looking.
---------------
-- Rendering --
---------------
function Get_From_Window
(Window : Gdk_Window;
Src_X : Gint;
Src_Y : Gint;
Width : Gint;
Height : Gint) return Gdk_Pixbuf;
function Get_From_Surface
(Surface : Cairo.Cairo_Surface;
Src_X : Gint;
Src_Y : Gint;
Width : Gint;
Height : Gint) return Gdk_Pixbuf;
-- Transfers image data from a Gdk_Window and converts it to an RGB(A)
-- representation inside a Gdk_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.
--
-- This function will create an RGB pixbuf with 8 bits per channel with
-- the same size specified by the Width and Height arguments. The pixbuf
-- will contain an alpha channel if the window contains one.
--
-- If 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.
--
-- If the window is not mapped (typically because it's iconified/minimized
-- or not on the current workspace), then Null_Pixbuf will be returned.
--
-- If memory can't be allocated for the return value, Null_Pixbuf
-- will be returned instead.
--
-- (In short, there are several ways this function can fail, and if it
-- fails it returns Null_Pixbuf; so check the return value.)
--
-- Return value: (transfer full): A newly-created pixbuf with a reference
-- count of 1, or Null_Pixbuf on error
-------------
-- Scaling --
-------------
procedure Scale
(Src : Gdk_Pixbuf;
Dest : Gdk_Pixbuf;
Dest_X : Gint;
Dest_Y : Gint;
Dest_Width : Gint;
Dest_Height : Gint;
Offset_X : Gdouble := 0.0;
Offset_Y : Gdouble := 0.0;
Scale_X : Gdouble := 1.0;
Scale_Y : Gdouble := 1.0;
Inter_Type : Gdk_Interp_Type := Interp_Bilinear);
-- Transform the source image by scaling by Scale_x and Scale_y then
-- translating by Offset_x and Offset_y.
-- The image is then rendered in the rectangle (Dest_x, Dest_y,
-- Dest_width, Dest_height) of the resulting image onto the destination
-- drawable replacing the previous contents.
procedure Composite
(Src : Gdk_Pixbuf;
Dest : Gdk_Pixbuf;
Dest_X : Gint;
Dest_Y : Gint;
Dest_Width : Gint;
Dest_Height : Gint;
Offset_X : Gdouble := 0.0;
Offset_Y : Gdouble := 0.0;
Scale_X : Gdouble := 1.0;
Scale_Y : Gdouble := 1.0;
Inter_Type : Gdk_Interp_Type := Interp_Bilinear;
Overall_Alpha : Alpha_Range := 128);
-- Transform the source image by scaling by Scale_X and Scale_Y then
-- translating by Offset_X and Offset_Y, then composite the rectangle
-- (Dest_X, Dest_Y, Dest_Width, Dest_Height) of the resulting image onto
-- the destination drawable.
procedure Composite_Color
(Src : Gdk_Pixbuf;
Dest : Gdk_Pixbuf;
Dest_X : Gint;
Dest_Y : Gint;
Dest_Width : Gint;
Dest_Height : Gint;
Offset_X : Gdouble := 0.0;
Offset_Y : Gdouble := 0.0;
Scale_X : Gdouble := 1.0;
Scale_Y : Gdouble := 1.0;
Inter_Type : Gdk_Interp_Type := Interp_Bilinear;
Overall_Alpha : Alpha_Range := 128;
Check_X : Gint := 0;
Check_Y : Gint := 0;
Check_Size : Gint := 0;
Color1 : Guint32 := 0;
Color2 : Guint32 := 0);
-- Transform the source image 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 drawable.
-- The origin of checkboard is at (Check_x, Check_y)
-- Color1 is the color at the upper left of the check.
function Scale_Simple
(Src : Gdk_Pixbuf;
Dest_Width : Gint;
Dest_Height : Gint;
Inter_Type : Gdk_Interp_Type := Interp_Bilinear) return Gdk_Pixbuf;
-- Scale the Src image to Dest_width x Dest_height and render the result
-- into a new pixbuf.
function Composite_Color_Simple
(Src : Gdk_Pixbuf;
Dest_Width : Gint;
Dest_Height : Gint;
Inter_Type : Gdk_Interp_Type := Interp_Bilinear;
Overall_Alpha : Alpha_Range := 128;
Color1 : Guint32 := 0;
Color2 : Guint32 := 0) return Gdk_Pixbuf;
-- Scale Src to Dest_width x Dest_height and composite the result with
-- a checkboard of colors Color1 and Color2 and render the result into
-- a new pixbuf.
-----------------------
-- Animation support --
-----------------------
function Get_Type_Animation return Glib.GType;
-- Return the internal value associated with a Gdk_Pixbuf_Animation.
procedure Gdk_New_From_File
(Animation : out Gdk_Pixbuf_Animation;
Filename : String;
Error : out GError);
-- Create a new animation by loading it from a file.
-- The file format is detected automatically. If the file's format does not
-- support multi-frame images, then an animation with a single frame will
-- be created. Possible errors are in the Pixbuf_Error and GFile_Error
-- domains.
-- On return, Animation is a newly created animation with a reference count
-- of 1, or null if any of several error conditions ocurred: 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.
procedure Ref (Animation : Gdk_Pixbuf_Animation);
-- Increment the reference counting on the animation.
procedure Unref (Animation : Gdk_Pixbuf_Animation);
-- Decrement the reference counting on the animation.
function Get_Width (Animation : Gdk_Pixbuf_Animation) return Gint;
-- Return the width of the bounding box of a pixbuf animation.
function Get_Height (Animation : Gdk_Pixbuf_Animation) return Gint;
-- Return the height of the bounding box of a pixbuf animation.
function Is_Static_Image (Animation : Gdk_Pixbuf_Animation) return Boolean;
-- If you load a file with Gdk_New_From_File and it turns out to be a
-- plain, unanimated image, then this function will return True.
-- Use Get_Static_Image to retrieve the image.
function Get_Static_Image
(Animation : Gdk_Pixbuf_Animation) return Gdk_Pixbuf;
-- If an animation is really just a plain image (has only one frame),
-- this function returns that image. If the animation is an animation,
-- this function returns a reasonable thing to display as a static
-- unanimated image, which might be the first frame, or something more
-- sophisticated. If an animation hasn't loaded any frames yet, this
-- function will return null.
function Get_Iter
(Animation : Gdk_Pixbuf_Animation;
Start_Time : GTime_Val_Access := null)
return Gdk_Pixbuf_Animation_Iter;
-- Get an iterator for displaying an animation. The iterator provides
-- the frames that should be displayed at a given time.
-- It should be freed after use with Unref.
--
-- Start_Time would normally come from G_Get_Current_Time, and marks the
-- beginning of animation playback. After creating an iterator, you should
-- immediately display the pixbuf returned by Get_Pixbuf. Then, you should
-- install a timeout (with Timeout_Add) or by some other mechanism to
-- ensure that you'll update the image after Get_Delay_Time milliseconds.
-- Each time the image is updated, you should reinstall the timeout with
-- the new, possibly-changed delay time.
--
-- As a shortcut, if Start_Time is equal to null, the result of
-- G_Get_Current_Time will be used automatically.
--
-- To update the image (i.e. possibly change the result of Get_Pixbuf to a
-- new frame of the animation), call Advance.
--
-- If you're using Gdk_Pixbuf_Loader, in addition to updating the image
-- after the delay time, you should also update it whenever you
-- receive the area_updated signal and On_Currently_Loading_Frame returns
-- True. In this case, the frame currently being fed into the loader
-- has received new data, so needs to be refreshed. The delay time for
-- a frame may also be modified after an area_updated signal, for
-- example if the delay time for a frame is encoded in the data after
-- the frame itself. So your timeout should be reinstalled after any
-- area_updated signal.
--
-- A delay time of -1 is possible, indicating "infinite."
---------------
-- Iterators --
---------------
function Get_Type_Animation_Iter return Glib.GType;
-- Return the internal value associated with a Gdk_Pixbuf_Animation_Iter.
procedure Ref (Iter : Gdk_Pixbuf_Animation_Iter);
-- Increment the reference counting on the iterator.
procedure Unref (Iter : Gdk_Pixbuf_Animation_Iter);
-- Decrement the reference counting on the iterator.
function Get_Delay_Time (Iter : Gdk_Pixbuf_Animation_Iter) return Gint;
-- Return the number of milliseconds the current pixbuf should be displayed
-- or -1 if the current pixbuf should be displayed forever. Timeout_Add
-- conveniently takes a timeout in milliseconds, so you can use a timeout
-- to schedule the next update.
function Get_Pixbuf (Iter : Gdk_Pixbuf_Animation_Iter) return Gdk_Pixbuf;
-- Return the current pixbuf which should be displayed.
-- The pixbuf will be the same size as the animation itself (Get_Width,
-- Get_Height). This pixbuf should be displayed for Get_Delay_Time
-- milliseconds. The caller of this function does not own a reference to
-- the returned pixbuf; the returned pixbuf will become invalid when the
-- iterator advances to the next frame, which may happen anytime you call
-- Advance. Copy the pixbuf to keep it (don't just add a reference), as it
-- may get recycled as you advance the iterator.
function On_Currently_Loading_Frame
(Iter : Gdk_Pixbuf_Animation_Iter) return Boolean;
-- Used to determine how to respond to the area_updated signal on
-- Gdk_Pixbuf_Loader when loading an animation. area_updated is emitted
-- for an area of the frame currently streaming in to the loader. So if
-- you're on the currently loading frame, you need to redraw the screen for
-- the updated area.
function Advance
(Iter : Gdk_Pixbuf_Animation_Iter;
Current_Timer : GTime_Val_Access := null) return Boolean;
-- Possibly advance an animation to a new frame.
-- Chooses the frame based on the start time passed to Get_Iter.
--
-- Current_Time would normally come from G_Get_Current_Time, and
-- must be greater than or equal to the time passed to Get_Iter,
-- and must increase or remain unchanged each time Get_Pixbuf is
-- called. That is, you can't go backward in time; animations only
-- play forward.
--
-- As a shortcut, pass null for the current time and G_Get_Current_Time
-- will be invoked on your behalf. So you only need to explicitly pass
-- Current_Time if you're doing something odd like playing the animation
-- at double speed.
--
-- If this function returns False, there's no need to update the animation
-- display, assuming the display had been rendered prior to advancing;
-- if True, you need to call Get_Pixbuf and update the display with the new
-- pixbuf.
-------------
-- Cursors --
-------------
procedure Gdk_New_From_Pixbuf
(Cursor : out Gdk.Gdk_Cursor;
Display : Gdk.Display.Gdk_Display := Gdk.Display.Get_Default;
Pixbuf : Gdk_Pixbuf;
X : Glib.Gint;
Y : Glib.Gint);
-- Create a cursor from a pixbuf.
-- Not all GDK backends support RGBA cursors. If they are not supported,
-- a monochrome approximation will be displayed.
-- The functions gdk.display.supports_cursor_alpha and
-- gdk.display.supports_cursor_color can be used to determine whether RGBA
-- cursors are supported;
-- gdk.display.get_default_cursor_size and
-- gdk.display.get_maximal_cursor_size give information about cursor sizes.
-- On the X backend, support for RGBA cursors requires a sufficently new
-- version of the X Render extension.
function Get_Image (Cursor : Gdk.Gdk_Cursor) return Gdk_Pixbuf;
-- Return the image stored in the cursor
-- <doc_ignore>
function Convert (P : System.Address) return Gdk_Pixbuf;
-- </doc_ignore>
private
type Gdk_Pixbuf_Record is new Glib.Object.GObject_Record with null record;
pragma Import (C, Get_Type, "gdk_pixbuf_get_type");
pragma Import (C, Get_Type_Animation, "gdk_pixbuf_animation_get_type");
pragma Import
(C, Get_Type_Animation_Iter, "gdk_pixbuf_animation_iter_get_type");
pragma Import (C, Get_Iter, "gdk_pixbuf_animation_get_iter");
pragma Import
(C, Get_Delay_Time, "gdk_pixbuf_animation_iter_get_delay_time");
end Gdk.Pixbuf;
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