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Diffstat (limited to 'src/images/image.vala')
| -rw-r--r-- | src/images/image.vala | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/src/images/image.vala b/src/images/image.vala new file mode 100644 index 0000000..836e4e2 --- /dev/null +++ b/src/images/image.vala @@ -0,0 +1,163 @@ +/* +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(); + } +} + +} |