Imported Upstream version 0.2+gitdfdad95upstream/0.2+gitdfdad95

1 files changed, 163 insertions, 0 deletions

diff --git a/src/utilities/image.vala b/src/utilities/image.vala
new file mode 100644
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+++ b/src/utilities/image.vala
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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();
+    }
+}
+
+}