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//
// CairoSurfaceWrapper.cs
//
// Author:
// Jonathan Pobst <monkey@jpobst.com>
//
// Copyright (c) 2012 Jonathan Pobst
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System;
using System.Threading;
namespace Pinta.ImageManipulation
{
public class CairoSurfaceWrapper : BaseSurface
{
private Cairo.ImageSurface surface;
private unsafe ColorBgra* data_ptr;
private int lock_count = 0;
public unsafe CairoSurfaceWrapper (Cairo.ImageSurface surface)
{
this.surface = surface;
this.data_ptr = (ColorBgra*)surface.DataPtr;
height = surface.Height;
width = surface.Width;
}
protected unsafe override ColorBgra* data {
get { return data_ptr; }
}
public override int Stride {
get { return surface.Stride; }
}
public override void BeginUpdate ()
{
Interlocked.Increment (ref lock_count);
if (lock_count > 1)
return;
surface.Flush ();
}
public override void EndUpdate ()
{
Interlocked.Decrement (ref lock_count);
if (lock_count == 0)
surface.MarkDirty ();
}
}
}