NAME
   Image::Imlib2 - Interface to the Imlib2 image library

SYNOPSIS
     use Image::Imlib2;

     # create a new image
     my $image = Image::Imlib2->new(200, 200);

     # Enable the alpha channel support
     $image->has_alpha(1);

     # set a colour (rgba, so this is transparent orange)
     $image->set_color(255, 127, 0, 127);

     # draw a rectangle
     $image->draw_rectangle(50, 50, 50, 50);

     # draw a filled rectangle
     $image->fill_rectangle(150, 50, 50, 50);

     # draw a line
     $image->draw_line(0, 0, 200, 50);

     # set quality before saving
     $image->set_quality(50);

     # save out
     $image->save('out.png');

     # create a polygon
     my $poly = Image::Imlib2::Polygon->new();

     # add some points
     $poly->add_point(0, 0);
     $poly->add_point(100, 0);
     $poly->add_point(100, 100);
     $poly->add_point(0, 100);

     # fill the polygon
     $poly->fill();

     # draw it closed on image
     $image->draw_polygon($poly, 1);

     # create a color range
     my $cr = Image::Imlib2::ColorRange->new();

     # add a color
     my ($distance, $red, $green, $blue, $alpha) = (15, 200, 100, 50, 20);
     $cr->add_color($distance, $red, $green, $blue, $alpha);

     # draw it
     my($x, $y, $width, $height, $angle) = (20, 30, 200, 200, 1);
     $image->fill_color_range_rectangle($cr, $x, $y,
                                        $width, $height, $angle);

DESCRIPTION
   Image::Imlib2 is a Perl port of Imlib2, a graphics library that does
   image file loading and saving as well as manipulation, arbitrary polygon
   support, etc. It does ALL of these operations FAST. It allows you to
   create colour images using a large number of graphics primitives, and
   output the images in a range of formats.

   Image::Imlib2::Polygon and Image::Imlib2::ColorRange are described
   following Image::Imlib2 but may be referenced before their description.

   Note that this is an early version of my attempt at a Perl interface to
   Imlib2. Currently, the API is just to test things out. Not everything is
   supported, but a great deal of functionality already exists. If you
   think the API can be tweaked to be a bit more intuitive, drop me a line!

   Note that a development version of Imlib2 must be installed before
   installing this module.

Exported constants
       TEXT_TO_RIGHT
       TEXT_TO_LEFT
       TEXT_TO_UP
       TEXT_TO_DOWN
       TEXT_TO_ANGLE

   To be used as the direction parameter for text functions that accept it.

METHODS (Image::Imlib2)
 new
   This will create a new, blank image. If the dimensions aren't specified,
   it will default to 256 x 256.

     my $image = new Image::Imlib2->new(100, 100)

 load
   This will load an existing graphics file and create a new image object.
   It reads quite a few different image formats.

     my $image = Image::Imlib2->load("foo.png");

 save
   This saves the current image out. Currently this is in PNG if the format
   has not been set using image_set_format().

     $image->save("out.png");

 image_set_format (format)
   This will set the image format for future save operations. format is a
   string and may be "jpeg", "tiff", "png", etc. The exact number of
   formats supported depends on how you built imlib2.

     $image->image_set_format("jpeg"); # Convert image to JPG

 set_quality
   This sets the quality of the saved picture - lower the quality to get
   smaller filesizes.

     $image->set_quality(50);

 set_color (r, g, b, a) or set_colour (r, g, b, a)
   This sets the colour that the drawing primitives will use. You specify
   the red, green, blue and alpha components, which should all range from 0
   to 255. The alpha component specified how transparent the colour is: 0
   is fully transparent (so drawing with it will be pointless), 127 is
   half-transparent, and 255 is fully opaque. Many examples:

     $image->set_colour(255, 255, 255, 255); # white
     $image->set_colour(  0,   0,   0, 255); # black
     $image->set_colour(127, 127, 127, 255); # 50% gray
     $image->set_colour(255,   0,   0, 255); # red
     $image->set_colour(  0, 255,   0, 255); # green
     $image->set_colour(  0,   0, 255, 255); # blue
     $image->set_colour(255, 127,   0, 127); # transparent orange

 draw_point (x, y)
   This colours a point in the image in the currently-selected colour. Note
   that the coordinate system used has (0, 0) at the top left, with (50, 0)
   to the right of the top left, (0, 50) below the top left, and (50, 50)
   to the bottom right of the top left.

     $image->draw_point(50, 50);

 query_pixel (x, y)
   This returns the colour of a pixel in the image. It returns the red,
   green, blue and alpha components:

     my($r, $g, $b, $a) = $image->query_pixel(50,50);

 draw_line (x1, y1, x2, y2)
   This draws a line between two points in the currently-selected colour.
   The following draws between the (0, 0) and (100, 100) points:

     $image->draw_line(0, 0, 100, 100);

 draw_rectangle (x, y, w, h)
   This draws a the outline of a rectangle with the top left point at (x,
   y) and having width w and height h in the current colour.

     $image->draw_rectangle(0, 0, 50, 50);

 fill_rectangle (x, y, w, h)
   This draws a filled rectangle with the top left point at (x, y) and
   having width w and height h in the current colour.

     $image->fill_rectangle(0, 0, 50, 50);

 draw_ellipse (x, y, w, h)
   This draws an ellipse which has center (x, y) and horizontal amplitude
   of w and vertical amplitude of h in the current colour. Note that
   setting w and h to the same value will draw a circle.

     $image->draw_ellipse(100, 100, 50, 50);

 fill_ellipse (x, y, w, h)
   This draws a filled ellipse which has center (x, y) and horizontal
   amplitude of w and vertical amplitude of h in the current colour. Note
   that setting w and h to the same value will draw a filled circle.

     $image->fill_ellipse(100, 100, 50, 50);

 add_font_path (dir)
   This function adds the directory path to the end of the current list of
   directories to scan for truetype (TTF) fonts.

     $image->add_font_path("./ttfonts");

 load_font (font)
   This function will load a truetype font from the first directory in the
   font path that contains that font. The font name format is
   "font_name/size". For example. If there is a font file called cinema.ttf
   somewhere in the font path you might use "cinema/20" to load a 20 pixel
   sized font of cinema.

   Note that this font will be used from now on, much like set_colour does
   for colours.

     $image->load_font("cinema/20");

 get_font_size (text, direction, angle)
   This function returns the width and height in pixels the text string
   would use up if drawn with the current font. direction and angle are
   optional and deault to TEXT_TO_RIGHT and 0, respectively.

     my($w, $h) = $image->get_text_size("Imlib2 and Perl!");
     my($w1, $w2) = $image->get_text_size("Crazy text",
                                          TEXT_TO_UP, 1);

 draw_text (x, y, text, direction, angle)
   This draws the text using the current font and colour onto the image at
   position (x, y). direction and angle are optional and deault to
   TEXT_TO_RIGHT and 0, respectively.

     $image->draw_text(50, 50, "Groovy, baby, yeah!");
     $image->draw_text(50, 50, "Sweet, baby, yeah!",
                       TEXT_TO_UP, 1.571);

 crop (x, y, w, h)
   This creates a duplicate of a x, y, width, height rectangle in the
   current image and returns another image.

     my $cropped_image = $image->crop(0, 0, 50, 50);

 blend (source_image, merge_alpha, sx, sy, sw, sh, dx, dy, dw, dh)
   This will blend the source rectangle x, y, width, height from the
   source_image onto the current image at the destination x, y location
   scaled to the width and height specified. If merge_alpha is set to 1 it
   will also modify the destination image alpha channel, otherwise the
   destination alpha channel is left untouched.

     $image->blend($cropped_image, 0, 0, 0, 50, 50, 200, 0, 50, 50);

 blur (radius)
   This will blur the image. A radius of 0 has no effect, 1 and above
   determine the blur matrix radius that determine how much to blur the
   image.

     $image->blur(1);

 sharpen (radius)
   This sharpens the image. The radius affects how much to sharpen by.

     $image->sharpen(1);

 clone ()
   This creates an exact duplicate of the current image.

     $cloned = $image->clone;

 draw_polygon (polygon, closed)
   This will draw polygon (of type Imlib2::Image::Polygon) on the the
   image. The the polygon is drawn closed is closed is 1 and open if closed
   is 0.

     $image->draw_polygon($poly, 1);

 fill_color_range_rectangle(color_range, x, y, w, h, angle);
   This uses the color range color_range to fille a rectangle with points
   x, y, x+width, y+width.

     $image->fill_color_range_rectangle($cr, 10, 20, 100, 150, 0);

 image_orientate (steps)
   This will rotate the image by steps*90 degrees, so to rotate by 90
   degrees set to 1, for 180 degrees set to 2, etc.

     $image->image_orientate(1);                    # Rotate by 90 degrees.

 create_scaled_image (x, y)
   Create a new image, scaled from the original to the dimensions given in
   x and y. If x or y are 0, then retain the aspect ratio given in the
   other.

     $image2=$image->create_scaled_image(100,100);  # Scale to 100x100 pixels

 flip_horizontal ()
   This will flip/mirror the image horizontally.

     $image->flip_horizontal();

 flip_vertical ()
   This will flip/mirror the image vertically.

     $image->flip_vertical();

 flip_diagonal ()
   This will flip/mirror the current image diagonally (good for quick and
   dirty 90 degree rotations if used before to after a horizontal or
   vertical flip).

     $image->flip_diagonal();

 has_alpha (BOOLEAN)
   Queries and/or sets the alpha support flag for the image. Note that
   alpha is on by default when you create an image:

      if ($image->has_alpha) {
         # do something requiring alpha support
      }
      # Enable the alpha channel
      $image->has_alpha(1);

 set_cache_size (INT)
   By default, Imlib2 will cache all loaded images (up to some maximum
   cache size) and will use this cache to avoid loading images from disk.

   Sets the size of the image cache. Reducing this value will cause the
   cache to be emptied. You can turn off caching all together by setting
   this to zero.

   Even without a cache, as long as you have a reference to an image in
   memory that image will be returned immediately without checking the
   disk.

     my $image = Image::Imlib2->load("foo.jpg"); # image loaded from disk
     ... later, somewhere else, after $image has gone away ...
     my $image = Image::Imlib2->load("foo.jpg"); # same image, even if changed on disk
     ... later, somewhere else, after $image has gone away ...
     Image::Imlib2->set_cache_size(0);
     my $image  = Image::Imlib2->load("foo.jpg"); # image loaded from disk
     my $image2 = Image::Imlib2->load("foo.jpg"); # same image as before, not reloaded

 get_cache_size ()
   Returns the maximum size of the Image cache.

 set_changes_on_disk ()
   Called on an Image::Imlib2 instance that you have loaded from disk, this
   method tells imlib that it should take extra care when caching the image
   for this filename. Next time the load method is called for this image's
   file name Imlib will check the modification time for the file on disk
   compared to the cached version and take appropriate action.

     my $image = Image::Imlib2->load("foo.jpg");
     $image->set_changes_on_disk();

     ...later...

     # reloads image from disk if mod time has changed (otherwise use cached)
     my $image = Image::Imlib2->load("foo.jpg");

   Calling this method on a loaded image tells Imlib2 to look at the disk
   and compare mtimes with it's loaded copy - by default, this is not the
   case, so even if a file changes on disk, it won't be re-loaded.

METHODS (Image::Imlib2::Polygon)
 new
   This will create a new polygon for use with Image::Imlib2::draw_polygon.

     my $poly = Image::Imlib2::Polygon->new();

 add_point (x, y)
   Adds a point to the polygonal construct.

     $poly->add_point(10,10);

 fill
   Fills polygon in the current context.

     $poly->fill();

METHODS (Image::Imlib2::ColorRange)
 new
   Creates a new color range.

     my $cr = Image::Imlib2::ColorRange->new();

 add_color (distance, red, green, blue, alpha)
   Similar to set_colour, but adds the color to the color range at the
   specified distance.

     $cr->add_color(10, 255, 127, 0, 66);

 get_width
   Returns the current width of the image.

     my $width = $image->get_width;

 get_height
   Returns the current height of the image.

     my $height = $image->get_height;

AUTHOR
   Leon Brocard, [email protected]

COPYRIGHT
   Copyright (c) 2000-5 Leon Brocard. All rights reserved. This program is
   free software; you can redistribute it and/or modify it under the same
   terms as Perl itself.

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