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authorAlessandro Ghedini <al3xbio@gmail.com>2011-10-19 10:56:04 +0200
committerAlessandro Ghedini <al3xbio@gmail.com>2011-10-19 10:56:04 +0200
commit6451a495637c6e3047a5a56573cffc6e3de9a515 (patch)
tree7c3eb29532e7c4b36a9da13c5890664fb816959b /src/utilities/image.vala
Imported Upstream version 0.2+gitdfdad95upstream/0.2+gitdfdad95
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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();
+ }
+}
+
+}