Provided by: libgtk2-perl-doc_1.249-2_all 
NAME
Gtk2::Gdk::Pixbuf - wrapper for GdkPixbuf
HIERARCHY
Glib::Object
+----Gtk2::Gdk::Pixbuf
INTERFACES
Glib::Object::_Unregistered::GIcon
Glib::Object::_Unregistered::GLoadableIcon
METHODS
pixbuf = Gtk2::Gdk::Pixbuf->new ($colorspace, $has_alpha, $bits_per_sample, $width, $height)
• $colorspace (Gtk2::Gdk::Colorspace)
• $has_alpha (boolean)
• $bits_per_sample (integer)
• $width (integer)
• $height (integer)
pixbuf = Gtk2::Gdk::Pixbuf->new_from_data ($data, $colorspace, $has_alpha, $bits_per_sample,
$width, $height, $rowstride)
• $data (scalar) packed binary pixel data, usually made with pack()
• $colorspace (Gtk2::Gdk::Colorspace)
• $has_alpha (boolean) true if the image data includes an alpha channel (opacity
information).
• $bits_per_sample (integer)
• $width (integer) in pixels.
• $height (integer) in pixels.
• $rowstride (integer) distance in bytes between row starts; usually 3*width for rgb
data, 4*width if $has_alpha is true.
Creates a new Gtk2::Gdk::Pixbuf out of in-memory image data. Currently only RGB images
with 8 bits per sample are supported.
In C this function allows you to wrap a GdkPixbuf structure around existing pixel data.
In Perl, we have to use "pack" to generate a scalar containing the pixel data, and pass
that scalar to "new_from_data", which copies the scalar to keep it around. It also
manages the memory automagically, so there's no need for a destruction notifier function.
This all means that if you change your copy of the data scalar later, the pixbuf will not
reflect that, but because of the way perl manages string data and scalars, it would be
pretty fragile to do that in the first place. If you need to modify a pixbuf's data after
it has been created, you can create new pixbufs for the changed regions and use
"$pixbuf->composite", or try a different approach (possibly use a server-side pixmap and
gdk drawing primitives, or something like libart).
pixbuf = Gtk2::Gdk::Pixbuf->new_from_file ($filename)
• $filename (localized file name)
May croak with a Glib::Error in $@ on failure.
pixbuf = Gtk2::Gdk::Pixbuf->new_from_file_at_scale ($filename, $width, $height,
$preserve_aspect_ratio)
• $filename (localized file name)
• $width (integer)
• $height (integer)
• $preserve_aspect_ratio (boolean)
May croak with a Glib::Error in $@ on failure.
Since: gtk+ 2.6
pixbuf = Gtk2::Gdk::Pixbuf->new_from_file_at_size ($filename, $width, $height)
• $filename (localized file name)
• $width (integer)
• $height (integer)
May croak with a Glib::Error in $@ on failure.
Since: gtk+ 2.4
pixbuf = Gtk2::Gdk::Pixbuf->new_from_inline ($data, $copy_pixels=TRUE)
• $data (scalar) packed binary data, the format is special, see discussion
• $copy_pixels (boolean) whether $data should be copied, defaults to true
Gtk+ ships with a tool called "gdk-pixbuf-csource", which turns any image understood by
gdk-pixbuf into the C syntax of the declaration of a static data structure containing that
image data, to be #included directly into your source code. "gdk_pixbuf_new_from_inline"
creates a new GdkPixbuf from that data structure.
Currently, this is not very easy to do from Perl. The output of "gdk-pixbuf-csource" must
be mangled rather ruthlessly to create valid Perl code using pack and translation from C
string escapes to valid Perl string escapes (for encoding and interpretation isses).
Because Perl scalars are garbage collected, it's rather rare to have the ability to use
static data, so $copy_pixels defaults to true; if you can guarantee the image data will
outlive the pixbuf you can pass false here and save some memory.
For more information, see the description of "gdk_pixbuf_new_from_inline" in the C API
reference at http://gtk.org/api/ .
May croak with a Glib::Error in $@ on failure.
pixbuf = Gtk2::Gdk::Pixbuf->new_from_xpm_data (...)
• ... (list) xpm data as a list of strings (see discussion)
X Pixel Map (XPM) files are designed to be easy to edit and easy to include directly into
C programs. The file format is the C syntax of the declaration and initialization of a
variable containing an array of strings. "new_from_xpm_data" allows you to create an
image from such data included directly in your program source.
Since XPM files are C syntax, you must mangle that source a bit to work in a Perl program.
For example, this is a valid xpm, but it is not valid Perl code:
/* XPM */
static char * test_xpm[] = {
"4 4 3 1",
" c None",
". c red",
"+ c blue",
".. +",
". ++",
" ++.",
"++.."};
You'll need to change the array declaration format, and change the double-quoted strings
to single-quoted to avoid Perl interpreting any chars in the strings as special.
my @test_xpm = (
'4 4 3 1',
' c None',
'. c red',
'+ c blue',
'.. +',
'. ++',
' ++.',
'++..');
$pixbuf = Gtk2::Gdk::Pixbuf->new_from_xpm_data (@test_xpm);
[It's only two or three regexes... Perhaps we should distribute a script to convert XPM
files to the proper format?]
pixbuf = $src_pixbuf->new_subpixbuf ($src_x, $src_y, $width, $height)
• $src_x (integer)
• $src_y (integer)
• $width (integer)
• $height (integer)
pixbuf = $pixbuf->add_alpha ($substitute_color, $r, $g, $b)
• $substitute_color (boolean)
• $r (Glib::UChar)
• $g (Glib::UChar)
• $b (Glib::UChar)
pixbuf = $src->apply_embedded_orientation
Since: gtk+ 2.11
integer = $pixbuf->get_bits_per_sample
colorspace = $pixbuf->get_colorspace
$src->composite ($dest, $dest_x, $dest_y, $dest_width, $dest_height, $offset_x, $offset_y,
$scale_x, $scale_y, $interp_type, $overall_alpha)
• $dest (Gtk2::Gdk::Pixbuf)
• $dest_x (integer)
• $dest_y (integer)
• $dest_width (integer)
• $dest_height (integer)
• $offset_x (double)
• $offset_y (double)
• $scale_x (double)
• $scale_y (double)
• $interp_type (Gtk2::Gdk::InterpType)
• $overall_alpha (integer)
$src->composite_color ($dest, $dest_x, $dest_y, $dest_width, $dest_height, $offset_x,
$offset_y, $scale_x, $scale_y, $interp_type, $overall_alpha, $check_x, $check_y,
$check_size, $color1, $color2)
• $dest (Gtk2::Gdk::Pixbuf)
• $dest_x (integer)
• $dest_y (integer)
• $dest_width (integer)
• $dest_height (integer)
• $offset_x (double)
• $offset_y (double)
• $scale_x (double)
• $scale_y (double)
• $interp_type (Gtk2::Gdk::InterpType)
• $overall_alpha (integer)
• $check_x (integer)
• $check_y (integer)
• $check_size (integer)
• $color1 (unsigned)
• $color2 (unsigned)
pixbuf or undef = $src->composite_color_simple ($dest_width, $dest_height, $interp_type,
$overall_alpha, $check_size, $color1, $color2)
• $dest_width (integer)
• $dest_height (integer)
• $interp_type (Gtk2::Gdk::InterpType)
• $overall_alpha (integer)
• $check_size (integer)
• $color1 (unsigned)
• $color2 (unsigned)
pixbuf = $pixbuf->copy
$src_pixbuf->copy_area ($src_x, $src_y, $width, $height, $dest_pixbuf, $dest_x, $dest_y)
• $src_x (integer)
• $src_y (integer)
• $width (integer)
• $height (integer)
• $dest_pixbuf (Gtk2::Gdk::Pixbuf)
• $dest_x (integer)
• $dest_y (integer)
(format, width, height) = $pixbuf->get_file_info ($filename)
• $filename (localized file name)
Parses enough of $filename to determine and return the format and size. If the format is
unknown or the file can't be opened, returns an empty list.
Since: gtk+ 2.4
$pixbuf->fill ($pixel)
• $pixel (unsigned) a packed RGBA value.
Clear $pixbuf to contain only the value given in $pixel.
pixbuf = $src->flip ($horizontal)
• $horizontal (boolean)
Since: gtk+ 2.6
list = Gtk2::Gdk::Pixbuf->get_formats
Returns a list of hashes with information about the formats supported by
Gtk2::Gdk::Pixbuf.
Since: gtk+ 2.2
pixbuf = Gtk2::Gdk::Pixbuf->get_from_drawable ($src, $cmap, $src_x, $src_y, $dest_x, $dest_y,
$width, $height)
pixbuf = $pixbuf->get_from_drawable ($src, $cmap, $src_x, $src_y, $dest_x, $dest_y, $width,
$height)
• $src (Gtk2::Gdk::Drawable)
• $cmap (Gtk2::Gdk::Colormap or undef)
• $src_x (integer)
• $src_y (integer)
• $dest_x (integer)
• $dest_y (integer)
• $width (integer)
• $height (integer)
Fetch pixels from a Gtk2::Gdk::Drawable as a Gtk2::Gdk::Pixbuf. Returns a new
Gtk2::Gdk::Pixbuf if you use the class form, or $pixbuf if you call it on an existing
pixbuf.
pixbuf = Gtk2::Gdk::Pixbuf->get_from_image ($src, $cmap, $src_x, $src_y, $dest_x, $dest_y,
$width, $height)
pixbuf = $pixbuf->get_from_image ($src, $cmap, $src_x, $src_y, $dest_x, $dest_y, $width,
$height)
• $src (Gtk2::Gdk::Image)
• $cmap (Gtk2::Gdk::Colormap or undef)
• $src_x (integer)
• $src_y (integer)
• $dest_x (integer)
• $dest_y (integer)
• $width (integer)
• $height (integer)
Fetch pixels from a Gtk2::Gdk::Image as a Gtk2::Gdk::Pixbuf. Returns a new
Gtk2::Gdk::Pixbuf if you use the class form, or $pixbuf if you call it on an existing
pixbuf.
boolean = $pixbuf->get_has_alpha
integer = $pixbuf->get_height
integer = $pixbuf->get_n_channels
string or undef = $pixbuf->get_option ($key)
• $key (string)
boolean = $pixbuf->set_option ($key, $value)
• $key (string)
• $value (string)
Since: gtk+ 2.2
scalar = $pixbuf->get_pixels
Return a copy of the bytes comprising the pixel data of $pixbuf.
As described in the Gdk Pixbuf reference manual (the "Note" section of "The GdkPixbuf
Structure"), the last row does not extend to the rowstride, but ends with the last byte of
the last pixel. The length of the "get_pixels" return reflects this.
pixmap = $pixbuf->render_pixmap_and_mask ($alpha_threshold)
(pixmap, mask) = $pixbuf->render_pixmap_and_mask ($alpha_threshold)
• $alpha_threshold (integer)
pixmap = $pixbuf->render_pixmap_and_mask_for_colormap ($colormap, $alpha_threshold)
(pixmap, mask) = $pixbuf->render_pixmap_and_mask_for_colormap ($colormap, $alpha_threshold)
• $colormap (Gtk2::Gdk::Colormap)
• $alpha_threshold (integer)
$pixbuf->render_threshold_alpha ($bitmap, $src_x, $src_y, $dest_x, $dest_y, $width, $height,
$alpha_threshold)
• $bitmap (Gtk2::Gdk::Bitmap)
• $src_x (integer)
• $src_y (integer)
• $dest_x (integer)
• $dest_y (integer)
• $width (integer)
• $height (integer)
• $alpha_threshold (integer)
$pixbuf->render_to_drawable ($drawable, $gc, $src_x, $src_y, $dest_x, $dest_y, $width,
$height, $dither, $x_dither, $y_dither)
• $drawable (Gtk2::Gdk::Drawable)
• $gc (Gtk2::Gdk::GC)
• $src_x (integer)
• $src_y (integer)
• $dest_x (integer)
• $dest_y (integer)
• $width (integer)
• $height (integer)
• $dither (Gtk2::Gdk::RgbDither)
• $x_dither (integer)
• $y_dither (integer)
$pixbuf->render_to_drawable_alpha ($drawable, $src_x, $src_y, $dest_x, $dest_y, $width,
$height, $alpha_mode, $alpha_threshold, $dither, $x_dither, $y_dither)
• $drawable (Gtk2::Gdk::Drawable)
• $src_x (integer)
• $src_y (integer)
• $dest_x (integer)
• $dest_y (integer)
• $width (integer)
• $height (integer)
• $alpha_mode (Gtk2::Gdk::PixbufAlphaMode)
• $alpha_threshold (integer)
• $dither (Gtk2::Gdk::RgbDither)
• $x_dither (integer)
• $y_dither (integer)
pixbuf = $src->rotate_simple ($angle)
• $angle (Gtk2::Gdk::PixbufRotation)
Since: gtk+ 2.6
integer = $pixbuf->get_rowstride
$src->saturate_and_pixelate ($dest, $saturation, $pixelate)
• $dest (Gtk2::Gdk::Pixbuf)
• $saturation (double)
• $pixelate (boolean)
$pixbuf->save ($filename, $type, ...)
• $filename (localized file name)
• $type (string) name of file format (e.g. "jpeg", "png")
• ... (list) list of key-value save options
Save $pixbuf to a file named $filename, in the format $type, which is currently "jpeg" or
"png". The function will croak if there is an error, which may arise from file- or image
format-related issues.
Any values in ... should be key/value string pairs that modify the saving parameters. For
example:
$pixbuf->save ($filename, 'jpeg', 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. (This is a quote from the C API
reference; note that the C API reference is the canonical source for this information.)
May croak with a Glib::Error in $@ on failure.
scalar = $pixbuf->save_to_buffer ($type, ...)
• $type (string) name of file format (e.g. "jpeg", "png")
• ... (list) list of key-value save options
Save $pixbuf to a scalar buffer, in the format $type, which is currently "jpeg" or "png".
The function will croak if there is an error, which may arise from image format-related
issues.
The returned string contains binary data, which may have embedded nuls. Don't try to
"print" it.
See "Gtk2::Gdk::Pixbuf::save" for more details.
May croak with a Glib::Error in $@ on failure.
Since: gtk+ 2.4
$src->scale ($dest, $dest_x, $dest_y, $dest_width, $dest_height, $offset_x, $offset_y,
$scale_x, $scale_y, $interp_type)
• $dest (Gtk2::Gdk::Pixbuf)
• $dest_x (integer)
• $dest_y (integer)
• $dest_width (integer)
• $dest_height (integer)
• $offset_x (double)
• $offset_y (double)
• $scale_x (double)
• $scale_y (double)
• $interp_type (Gtk2::Gdk::InterpType)
pixbuf or undef = $src->scale_simple ($dest_width, $dest_height, $interp_type)
• $dest_width (integer)
• $dest_height (integer)
• $interp_type (Gtk2::Gdk::InterpType)
integer = $pixbuf->get_width
PROPERTIES
'bits-per-sample' (integer : default 8 : readable / writable / construct-only / private)
The number of bits per sample
'colorspace' (Gtk2::Gdk::Colorspace : default "rgb" : readable / writable / construct-only
/ private)
The colorspace in which the samples are interpreted
'has-alpha' (boolean : default false : readable / writable / construct-only / private)
Whether the pixbuf has an alpha channel
'height' (integer : default 1 : readable / writable / construct-only / private)
The number of rows of the pixbuf
'n-channels' (integer : default 3 : readable / writable / construct-only / private)
The number of samples per pixel
'pixels' (gpointer : default 0 : readable / writable / construct-only / private)
A pointer to the pixel data of the pixbuf
'rowstride' (integer : default 1 : readable / writable / construct-only / private)
The number of bytes between the start of a row and the start of the next row
'width' (integer : default 1 : readable / writable / construct-only / private)
The number of columns of the pixbuf
ENUMS AND FLAGS
enum Gtk2::Gdk::Colorspace
• 'rgb' / 'GDK_COLORSPACE_RGB'
enum Gtk2::Gdk::InterpType
• 'nearest' / 'GDK_INTERP_NEAREST'
• 'tiles' / 'GDK_INTERP_TILES'
• 'bilinear' / 'GDK_INTERP_BILINEAR'
• 'hyper' / 'GDK_INTERP_HYPER'
enum Gtk2::Gdk::PixbufAlphaMode
• 'bilevel' / 'GDK_PIXBUF_ALPHA_BILEVEL'
• 'full' / 'GDK_PIXBUF_ALPHA_FULL'
enum Gtk2::Gdk::PixbufError
• 'corrupt-image' / 'GDK_PIXBUF_ERROR_CORRUPT_IMAGE'
• 'insufficient-memory' / 'GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY'
• 'bad-option' / 'GDK_PIXBUF_ERROR_BAD_OPTION'
• 'unknown-type' / 'GDK_PIXBUF_ERROR_UNKNOWN_TYPE'
• 'unsupported-operation' / 'GDK_PIXBUF_ERROR_UNSUPPORTED_OPERATION'
• 'failed' / 'GDK_PIXBUF_ERROR_FAILED'
enum Gtk2::Gdk::PixbufRotation
• 'none' / 'GDK_PIXBUF_ROTATE_NONE'
• 'counterclockwise' / 'GDK_PIXBUF_ROTATE_COUNTERCLOCKWISE'
• 'upsidedown' / 'GDK_PIXBUF_ROTATE_UPSIDEDOWN'
• 'clockwise' / 'GDK_PIXBUF_ROTATE_CLOCKWISE'
enum Gtk2::Gdk::RgbDither
• 'none' / 'GDK_RGB_DITHER_NONE'
• 'normal' / 'GDK_RGB_DITHER_NORMAL'
• 'max' / 'GDK_RGB_DITHER_MAX'
SEE ALSO
Gtk2, Glib::Object
COPYRIGHT
Copyright (C) 2003-2011 by the gtk2-perl team.
This software is licensed under the LGPL. See Gtk2 for a full notice.