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//
// ImageBuilderBackend.cs
//
// Author:
// Lluis Sanchez <lluis@xamarin.com>
//
// Copyright (c) 2012 Xamarin Inc
//
// 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 Xwt.Backends;
using Xwt.Drawing;
using Xwt.CairoBackend;
namespace Xwt.GtkBackend
{
public class ImageBuilderBackend: ImageBuilderBackendHandler
{
public ImageBuilderBackend ()
{
}
#region IImageBuilderBackendHandler implementation
public override bool DisposeHandleOnUiThread {
get {
return true;
}
}
public override object CreateImageBuilder (int width, int height, ImageFormat format)
{
Cairo.Format cformat;
switch (format) {
case ImageFormat.ARGB32: cformat = Cairo.Format.ARGB32; break;
default: cformat = Cairo.Format.RGB24; break;
}
return new Cairo.ImageSurface (cformat, width, height);
}
public override object CreateContext (object backend)
{
Cairo.Surface sf = (Cairo.Surface) backend;
CairoContextBackend ctx = new CairoContextBackend (1);
ctx.Context = new Cairo.Context (sf);
return ctx;
}
public override object CreateImage (object backend)
{
var pix = CreatePixbuf ((Cairo.ImageSurface)backend);
return new GtkImage (pix);
}
public static Gdk.Pixbuf CreatePixbuf (Cairo.ImageSurface sf)
{
byte[] cdata = sf.Data;
int nbytes = sf.Format == Cairo.Format.ARGB32 ? 4 : 3;
byte[] data = new byte[(cdata.Length / 4) * nbytes];
int i = 0;
int n = 0;
var stride = sf.Stride;
int ncols = sf.Width;
if (BitConverter.IsLittleEndian) {
var row = sf.Height;
while (row-- > 0) {
var prevPos = n;
var col = ncols;
while (col-- > 0) {
double alphaFactor = nbytes == 4 ? 255d / cdata [n + 3] : 1;
data[i] = (byte) (cdata[n+2] * alphaFactor + 0.5);
data[i + 1] = (byte) (cdata[n+1] * alphaFactor + 0.5);
data[i + 2] = (byte) (cdata[n+0] * alphaFactor + 0.5);
if (nbytes == 4)
data[i + 3] = cdata [n + 3];
n += 4;
i += nbytes;
}
n = prevPos + stride;
}
} else {
var row = sf.Height;
while (row-- > 0) {
var prevPos = n;
var col = ncols;
while (col-- > 0) {
double alphaFactor = nbytes == 4 ? 255d / cdata [n + 3] : 1;
data[i] = (byte) (cdata[n+1] * alphaFactor + 0.5);
data[i + 1] = (byte) (cdata[n+2] * alphaFactor + 0.5);
data[i + 2] = (byte) (cdata[n+3] * alphaFactor + 0.5);
if (nbytes == 4)
data[i + 3] = cdata [n + 0];
n += 4;
i += nbytes;
}
n = prevPos + stride;
}
}
return new Gdk.Pixbuf (data, Gdk.Colorspace.Rgb, nbytes == 4, 8, sf.Width, sf.Height, sf.Width * nbytes, null);
}
public override void Dispose (object backend)
{
IDisposable sf = (IDisposable) backend;
sf.Dispose ();
}
#endregion
}
}
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