/*
* This file is part of gitg
*
* Copyright (C) 2012 - Jesse van den Kieboom
*
* gitg 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 2 of the License, or
* (at your option) any later version.
*
* gitg 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 gitg. If not, see .
*/
namespace Gitg
{
public class LabelRenderer
{
private static const int margin = 2;
private static const int padding = 6;
private static string label_text(Ref r)
{
var escaped = Markup.escape_text(r.parsed_name.shortname);
return "%s".printf(escaped);
}
private static int get_label_width(Pango.Layout layout,
Ref r)
{
var smaller = label_text(r);
int w;
layout.set_markup(smaller, -1);
layout.get_pixel_size(out w, null);
return w + padding * 2;
}
public static int width(Gtk.Widget widget,
Pango.FontDescription *font,
SList[ labels)
{
if (labels == null)
{
return 0;
}
int ret = 0;
var ctx = widget.get_pango_context();
var layout = new Pango.Layout(ctx);
layout.set_font_description(font);
foreach (Ref r in labels)
{
ret += get_label_width(layout, r) + margin;
}
return ret + margin;
}
private static string class_from_ref(RefType type)
{
string style_class;
switch (type)
{
case RefType.BRANCH:
style_class = "branch";
break;
case RefType.REMOTE:
style_class = "remote";
break;
case RefType.TAG:
style_class = "tag";
break;
case RefType.STASH:
style_class = "stash";
break;
default:
style_class = null;
break;
}
return style_class;
}
private static int render_label(Gtk.Widget widget,
Cairo.Context cr,
Pango.Layout layout,
Ref r,
double x,
double y,
int height,
bool use_state)
{
var context = widget.get_style_context();
var smaller = label_text(r);
layout.set_markup(smaller, -1);
int w;
int h;
layout.get_pixel_size(out w, out h);
context.save();
var style_class = class_from_ref(r.parsed_name.rtype);
if (style_class != null)
{
context.add_class(style_class);
}
var rtl = (widget.get_style_context().get_state() & Gtk.StateFlags.DIR_RTL) != 0;
if (rtl)
{
x -= w + padding * 2;
}
context.render_background(cr,
x,
y + margin,
w + padding * 2,
height - margin * 2);
context.render_frame(cr,
x,
y + margin,
w + padding * 2,
height - margin * 2);
context.render_layout(cr,
x + padding,
y + (height - h) / 2.0 - 1,
layout);
context.restore();
return w;
}
public static void draw(Gtk.Widget widget,
Pango.FontDescription font,
Cairo.Context context,
SList][ labels,
Gdk.Rectangle area)
{
double pos;
var rtl = (widget.get_style_context().get_state() & Gtk.StateFlags.DIR_RTL) != 0;
if (!rtl)
{
pos = area.x + margin + 0.5;
}
else
{
pos = area.x + area.width - margin - 0.5;
}
context.save();
context.set_line_width(1.0);
var ctx = widget.get_pango_context();
var layout = new Pango.Layout(ctx);
layout.set_font_description(font);
foreach (Ref r in labels)
{
var w = render_label(widget,
context,
layout,
r,
(int)pos,
area.y,
area.height,
true);
var o = w + padding * 2 + margin;
pos += rtl ? -o : o;
}
context.restore();
}
public static Ref? get_ref_at_pos(Gtk.Widget widget,
Pango.FontDescription font,
SList][ labels,
int x,
out int hot_x)
{
hot_x = 0;
if (labels == null)
{
return null;
}
var ctx = widget.get_pango_context();
var layout = new Pango.Layout(ctx);
layout.set_font_description(font);
int start = margin;
Ref? ret = null;
foreach (Ref r in labels)
{
int width = get_label_width(layout, r);
if (x >= start && x <= start + width)
{
ret = r;
hot_x = x - start;
break;
}
start += width + margin;
}
return ret;
}
private static uchar convert_color_channel(uchar color,
uchar alpha)
{
return (uchar)((alpha != 0) ? (color / (alpha / 255.0)) : 0);
}
private static void convert_bgra_to_rgba(uchar[] src,
uchar[] dst,
int width,
int height)
{
int i = 0;
for (int y = 0; y < height; ++y)
{
for (int x = 0; x < width; ++x)
{
dst[i] = convert_color_channel(src[i + 2], src[i + 3]);
dst[i + 1] = convert_color_channel(src[i + 1], src[i + 3]);
dst[i + 2] = convert_color_channel(src[i], src[i + 3]);
dst[i + 3] = src[i + 3];
i += 4;
}
}
}
public static Gdk.Pixbuf render_ref(Gtk.Widget widget,
Pango.FontDescription font,
Ref r,
int height,
int minwidth)
{
var ctx = widget.get_pango_context();
var layout = new Pango.Layout(ctx);
layout.set_font_description(font);
int width = int.max(get_label_width(layout, r), minwidth);
var surface = new Cairo.ImageSurface(Cairo.Format.ARGB32,
width + 2,
height + 2);
var context = new Cairo.Context(surface);
context.set_line_width(1);
render_label(widget, context, layout, r, 1, 1, height, false);
var data = surface.get_data();
Gdk.Pixbuf ret = new Gdk.Pixbuf(Gdk.Colorspace.RGB,
true,
8,
width + 2,
height + 2);
var pixdata = ret.get_pixels();
convert_bgra_to_rgba(data, pixdata, width + 2, height + 2);
return ret;
}
}
}
// ex:ts=4 noet
]