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/////////////////////////////////////////////////////////////////////////
// Copyright (c) 2011-2016 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) {
if (pixbuf != null) this.load_pixbuf(pixbuf);
else this.surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, 1, 1);
}
/////////////////////////////////////////////////////////////////////
/// Captures a part of the screen.
/////////////////////////////////////////////////////////////////////
public Image.capture_screen(int posx, int posy, int width, int height, bool hide_pies = true) {
Gdk.Window root = Gdk.get_default_root_window();
Gdk.Pixbuf pixbuf = Gdk.pixbuf_get_from_window(root, posx, posy, width, height);
this.load_pixbuf(pixbuf);
if (hide_pies) {
// check for opened pies
foreach (var window in PieManager.opened_windows) {
if (window.background != null) {
int x=0, y=0, dx=0, dy=0;
window.get_position(out x, out y);
window.get_size(out dx, out dy);
var ctx = this.context();
ctx.translate((int)(x-posx + (dx+3)/2), (int)(y-posy + (dy+3)/2));
window.background.paint_on(ctx);
}
}
}
}
/////////////////////////////////////////////////////////////////////
/// 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 + "!");
this.surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, 1, 1);
}
} 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 + "!");
this.surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, width, height);
}
} 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, (int)(-0.5*this.width()-1), (int)(-0.5*this.height()-1));
if (alpha >= 1.0) ctx.paint();
else ctx.paint_with_alpha(alpha);
}
/////////////////////////////////////////////////////////////////////
/// Converts the image to a Gdk.Pixbuf.
/////////////////////////////////////////////////////////////////////
public Gdk.Pixbuf to_pixbuf() {
if (this.surface == null || this.surface.get_data() == null)
return new Gdk.Pixbuf(Gdk.Colorspace.RGB, true, 8, 1, 1);
var pixbuf = new Gdk.Pixbuf.with_unowned_data(this.surface.get_data(), Gdk.Colorspace.RGB, true, 8,
width(), height(), this.surface.get_stride(), null);
pixbuf = pixbuf.copy();
// funny stuff here --- need to swap Red end Blue because Cairo
// and Gdk are different...
uint8* p = pixbuf.pixels;
for (int i=0; i<width()*height()*4-4; i+=4) {
var tmp = *(p + i);
*(p + i) = *(p + i + 2);
*(p + i + 2) = tmp;
}
return pixbuf;
}
/////////////////////////////////////////////////////////////////////
/// 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() {
if (this.surface != null)
return this.surface.get_width();
return 0;
}
/////////////////////////////////////////////////////////////////////
/// Returns the height of the image in pixels.
/////////////////////////////////////////////////////////////////////
public int height() {
if (this.surface != null)
return this.surface.get_height();
return 0;
}
}
}
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