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//
// BmpPicture.cs
//
// Author:
// Jean-Philippe Bruyère <jp.bruyere@hotmail.com>
//
// Copyright (c) 2015 jp
//
// 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/>.
using System;
using System.IO;
using Cairo;
namespace go
{
public class BmpPicture : Picture
{
byte[] image;
public BmpPicture ()
{}
public BmpPicture (string path) : base(path)
{}
protected override void loadFromStream (Stream stream)
{
using (MemoryStream ms = new MemoryStream ()) {
stream.CopyTo (ms);
loadBitmap (new System.Drawing.Bitmap (ms));
}
}
//load image via System.Drawing.Bitmap, cairo load png only
void loadBitmap (System.Drawing.Bitmap bitmap)
{
if (bitmap == null)
return;
System.Drawing.Imaging.BitmapData data = bitmap.LockBits
(new System.Drawing.Rectangle (0, 0, bitmap.Width, bitmap.Height),
System.Drawing.Imaging.ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
Dimensions = new Size (bitmap.Width, bitmap.Height);
int stride = data.Stride;
int bitmapSize = Math.Abs (data.Stride) * bitmap.Height;
image = new byte[bitmapSize];
System.Runtime.InteropServices.Marshal.Copy (data.Scan0, image, 0, bitmapSize);
bitmap.UnlockBits (data);
}
public override void Paint (Cairo.Context gr, Rectangle rect, string subPart = "")
{
float widthRatio = 1f;
float heightRatio = 1f;
if (Scale){
widthRatio = (float)rect.Width / Dimensions.Width;
heightRatio = (float)rect.Height / Dimensions.Height;
}
float ratio = Math.Min (widthRatio, heightRatio);
// if (KeepProportions)
// widthRatio = heightRatio = ratio;
Rectangle rImg = rect;
gr.Save ();
if (KeepProportions) {
gr.Translate ((rect.Width - (float)Dimensions.Width * ratio)/2f,
(rect.Height - (float)Dimensions.Height * ratio)/2f);
gr.Scale (ratio, ratio);
}else
gr.Scale (widthRatio, heightRatio);
using (ImageSurface imgSurf = new ImageSurface (image, Format.Argb32,
Dimensions.Width, Dimensions.Height, 4 * Dimensions.Width)) {
gr.SetSourceSurface (imgSurf, (int)(rImg.X / widthRatio), (int)(rImg.Y / heightRatio));
gr.Paint ();
}
gr.Restore ();
}
}
}
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