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/*
Copyright (c) 2011 by Simon Schneegans
This program is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option)
any later version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see <http://www.gnu.org/licenses/>.
*/
namespace GnomePie {
/////////////////////////////////////////////////////////////////////////
/// A class which loads image files. It can load image files in various
/// formats, including jpeg, png and svg.
/////////////////////////////////////////////////////////////////////////
public class Image : GLib.Object {
/////////////////////////////////////////////////////////////////////
/// The internally used surface.
/////////////////////////////////////////////////////////////////////
public Cairo.ImageSurface surface { public get; protected set; default=null; }
/////////////////////////////////////////////////////////////////////
/// Creates an empty Image.
/////////////////////////////////////////////////////////////////////
public Image.empty(int width, int height, Color? color = null) {
this.surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, width, height);
if (color != null) {
var ctx = this.context();
ctx.set_source_rgb(color.r, color.g, color.b);
ctx.paint();
}
}
/////////////////////////////////////////////////////////////////////
/// Creates an image from the the given filename.
/////////////////////////////////////////////////////////////////////
public Image.from_file(string filename) {
this.load_file(filename);
}
/////////////////////////////////////////////////////////////////////
/// Creates an image from the the given filename at a given size.
/////////////////////////////////////////////////////////////////////
public Image.from_file_at_size(string filename, int width, int height) {
this.load_file_at_size(filename, width, height);
}
/////////////////////////////////////////////////////////////////////
/// Creates an image from the the given Gdk.Pixbuf.
/////////////////////////////////////////////////////////////////////
public Image.from_pixbuf(Gdk.Pixbuf pixbuf) {
this.load_pixbuf(pixbuf);
}
public Image.capture_screen(int posx, int posy, int width, int height) {
Gdk.Window root = Gdk.get_default_root_window();
Gdk.Pixbuf pixbuf = Gdk.pixbuf_get_from_drawable(null, root, null, posx, posy, 0, 0, width, height);
this.load_pixbuf(pixbuf);
}
/////////////////////////////////////////////////////////////////////
/// Loads an image from the the given filename.
/////////////////////////////////////////////////////////////////////
public void load_file(string filename) {
try {
var pixbuf = new Gdk.Pixbuf.from_file(filename);
if (pixbuf != null) {
this.load_pixbuf(pixbuf);
} else {
warning("Failed to load " + filename + "!");
}
} catch (GLib.Error e) {
message("Error loading image file: %s", e.message);
this.surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, 1, 1);
}
}
/////////////////////////////////////////////////////////////////////
/// Loads an image from the the given filename at a given size.
/////////////////////////////////////////////////////////////////////
public void load_file_at_size(string filename, int width, int height) {
try {
var pixbuf = new Gdk.Pixbuf.from_file_at_size(filename, width, height);
if (pixbuf != null) {
this.load_pixbuf(pixbuf);
} else {
warning("Failed to load " + filename + "!");
}
} catch (GLib.Error e) {
message("Error loading image file: %s", e.message);
this.surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, width, height);
}
}
/////////////////////////////////////////////////////////////////////
/// Loads an image from the the given Gdk.Pixbuf.
/////////////////////////////////////////////////////////////////////
public void load_pixbuf(Gdk.Pixbuf pixbuf) {
this.surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, pixbuf.width, pixbuf.height);
var ctx = this.context();
Gdk.cairo_set_source_pixbuf(ctx, pixbuf, 1.0, 1.0);
ctx.paint();
}
/////////////////////////////////////////////////////////////////////
/// Paints the image onto the given Cairo.Context
/////////////////////////////////////////////////////////////////////
public void paint_on(Cairo.Context ctx, double alpha = 1.0) {
ctx.set_source_surface(this.surface, -0.5*this.width()-1, -0.5*this.height()-1);
if (alpha >= 1.0) ctx.paint();
else ctx.paint_with_alpha(alpha);
}
/////////////////////////////////////////////////////////////////////
/// Returns a Cairo.Context for the Image.
/////////////////////////////////////////////////////////////////////
public Cairo.Context context() {
return new Cairo.Context(this.surface);;
}
/////////////////////////////////////////////////////////////////////
/// Returns the width of the image in pixels.
/////////////////////////////////////////////////////////////////////
public int width() {
return this.surface.get_width();
}
/////////////////////////////////////////////////////////////////////
/// Returns the height of the image in pixels.
/////////////////////////////////////////////////////////////////////
public int height() {
return this.surface.get_height();
}
}
}
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