SharpDxを利用して、読み込んだ画像を画面表示し、画像データにして保存

SharpDxを利用して、読み込んだ画像を画面表示し、再度画像データにして保存します。

ネットで検索しましたが、SharpDX.Direct2D1.BitmapRenderTargetで保持したデータを画像ファイルに保存するサンプルがなく非常に苦労しました。

サンプルでは、SharpDX.Direct2D1.BitmapRenderTargetからSharpDX.Direct2D1.WicRenderTargetに変換してから画像ファイルに保存します。

１．使用した画像

以下は、読み込んだ画像です。

以下は、書き込んだ画像で、背景を水色に変更し、サイズを半分にしています。

２．参考ソース

以下参考ソースです。

初期処理

初期処理では、画像に表示するためのWinRenderTargetを作成します。
注意点は、WinRenderTargetを作成するための引数であるRenderTargetPropertiesに、RenderTargetType.Softwareを指定する点です。
※Software以外はエラーになります。
また、画像保存処理でも、同じRenderTargetPropertiesを利用します。

using SD = System.Drawing;
using SDX = SharpDX;
using SDX2D = SharpDX.Direct2D1;
using SDXDW = SharpDX.DirectWrite;
using SDXWin = SharpDX.Windows;
using SDXMath = SharpDX.Mathematics.Interop;
public void Initialize(Control control)
{
    this.Factory2D = new SDX2D.Factory();
    var hrtProps = new SDX2D.HwndRenderTargetProperties();
    hrtProps.Hwnd = control.Handle;
    hrtProps.PixelSize = new SDX.Size2(control.ClientSize.Width, control.ClientSize.Height);
    hrtProps.PresentOptions = SDX2D.PresentOptions.None;
    this.RenderTargetProps = new SDX2D.RenderTargetProperties(
        SDX2D.RenderTargetType.Software,
        new SDX2D.PixelFormat(SDX.DXGI.Format.Unknown, SDX2D.AlphaMode.Unknown),
        0,
        0,
        SDX2D.RenderTargetUsage.None,
        SDX2D.FeatureLevel.Level_DEFAULT);

    this.WinRenderTarget = new SDX2D.WindowRenderTarget(Factory2D, this.RenderTargetProps, hrtProps);
    this.WinRenderTarget.AntialiasMode = SDX2D.AntialiasMode.PerPrimitive;
    this.WinRenderTarget.TextAntialiasMode = SDX2D.TextAntialiasMode.Cleartype;
}

using SD = System.Drawing;

using SDX = SharpDX;

using SDX2D = SharpDX.Direct2D1;

using SDXDW = SharpDX.DirectWrite;

using SDXWin = SharpDX.Windows;

using SDXMath = SharpDX.Mathematics.Interop;

public void Initialize(Control control)

{

this.Factory2D = new SDX2D.Factory();

var hrtProps = new SDX2D.HwndRenderTargetProperties();

hrtProps.Hwnd = control.Handle;

hrtProps.PixelSize = new SDX.Size2(control.ClientSize.Width, control.ClientSize.Height);

hrtProps.PresentOptions = SDX2D.PresentOptions.None;

this.RenderTargetProps = new SDX2D.RenderTargetProperties(

SDX2D.RenderTargetType.Software,

new SDX2D.PixelFormat(SDX.DXGI.Format.Unknown, SDX2D.AlphaMode.Unknown),

SDX2D.RenderTargetUsage.None,

SDX2D.FeatureLevel.Level_DEFAULT);

this.WinRenderTarget = new SDX2D.WindowRenderTarget(Factory2D, this.RenderTargetProps, hrtProps);

this.WinRenderTarget.AntialiasMode = SDX2D.AntialiasMode.PerPrimitive;

this.WinRenderTarget.TextAntialiasMode = SDX2D.TextAntialiasMode.Cleartype;

}

画像読み込み

画像を読み込んで、SharpDX.Direct2D1.Bitmap型に変換します。

public SDX2D.Bitmap LoadFromFile(string filename)
{
    var bmp = (System.Drawing.Bitmap)System.Drawing.Image.FromFile(filename);
    var bmpData = bmp.LockBits(
        new System.Drawing.Rectangle(0, 0, bmp.Width, bmp.Height),
        System.Drawing.Imaging.ImageLockMode.ReadOnly,
        System.Drawing.Imaging.PixelFormat.Format32bppPArgb);

    var stream = new SharpDX.DataStream(bmpData.Scan0, bmpData.Stride * bmpData.Height, true, false);
    var pFormat = new SharpDX.Direct2D1.PixelFormat(SharpDX.DXGI.Format.B8G8R8A8_UNorm, 
        SDX2D.AlphaMode.Premultiplied);
    var bmpProps = new SharpDX.Direct2D1.BitmapProperties(pFormat);

    var result =
        new SharpDX.Direct2D1.Bitmap(
            this.WinRenderTarget,
            new SharpDX.Size2(bmp.Width, bmp.Height),
            stream,
            bmpData.Stride,
            bmpProps);

    bmp.UnlockBits(bmpData);
    stream.Dispose();
    bmp.Dispose();
    return result;
}

public SDX2D.Bitmap LoadFromFile(string filename)

{

var bmp = (System.Drawing.Bitmap)System.Drawing.Image.FromFile(filename);

var bmpData = bmp.LockBits(

new System.Drawing.Rectangle(0, 0, bmp.Width, bmp.Height),

System.Drawing.Imaging.ImageLockMode.ReadOnly,

System.Drawing.Imaging.PixelFormat.Format32bppPArgb);

var stream = new SharpDX.DataStream(bmpData.Scan0, bmpData.Stride * bmpData.Height, true, false);

var pFormat = new SharpDX.Direct2D1.PixelFormat(SharpDX.DXGI.Format.B8G8R8A8_UNorm,

SDX2D.AlphaMode.Premultiplied);

var bmpProps = new SharpDX.Direct2D1.BitmapProperties(pFormat);

var result =

new SharpDX.Direct2D1.Bitmap(

this.WinRenderTarget,

new SharpDX.Size2(bmp.Width, bmp.Height),

stream,

bmpData.Stride,

bmpProps);

bmp.UnlockBits(bmpData);

stream.Dispose();

bmp.Dispose();

return result;

}

画像の表示

読み込んだ、SharpDX.Direct2D1.Bitmap型のデータを、一旦バッファ(BmpRenderTarget)に格納し、バッファのデータを画像に表示するためのWinRenderTargetにドローし、画面に表示します。

public SDX2D.Bitmap DrawBitmap(SDX2D.Bitmap bitmap)
{
    int width = (int)bitmap.Size.Width;
    int height = (int)bitmap.Size.Height;

    this.BmpRenderTarget = new SDX2D.BitmapRenderTarget(this.WinRenderTarget,
        SDX2D.CompatibleRenderTargetOptions.None, 
        new SDX.Size2F(bitmap.Size.Width, bitmap.Size.Height), null, null);

    this.BmpRenderTarget.BeginDraw();
    this.BmpRenderTarget.Clear(SDX.Color.LightBlue);
    this.BmpRenderTarget.DrawBitmap(bitmap, 
        new SDX.RectangleF(0f, 0f, bitmap.Size.Width, bitmap.Size.Height), 
        1.0f, SDX2D.BitmapInterpolationMode.NearestNeighbor);
    this.BmpRenderTarget.EndDraw();

    this.WinRenderTarget.BeginDraw();
    this.WinRenderTarget.Clear(SDX.Color.White);
    this.WinRenderTarget.DrawBitmap(this.BmpRenderTarget.Bitmap, 
        new SDX.RectangleF(0f, 0f, bitmap.Size.Width, bitmap.Size.Height), 
        1.0f, SDX2D.BitmapInterpolationMode.NearestNeighbor);
    this.WinRenderTarget.EndDraw();
    return this.BmpRenderTarget.Bitmap;
}

public SDX2D.Bitmap DrawBitmap(SDX2D.Bitmap bitmap)

{

int width = (int)bitmap.Size.Width;

int height = (int)bitmap.Size.Height;

this.BmpRenderTarget = new SDX2D.BitmapRenderTarget(this.WinRenderTarget,

SDX2D.CompatibleRenderTargetOptions.None,

new SDX.Size2F(bitmap.Size.Width, bitmap.Size.Height), null, null);

this.BmpRenderTarget.BeginDraw();

this.BmpRenderTarget.Clear(SDX.Color.LightBlue);

this.BmpRenderTarget.DrawBitmap(bitmap,

new SDX.RectangleF(0f, 0f, bitmap.Size.Width, bitmap.Size.Height),

1.0f, SDX2D.BitmapInterpolationMode.NearestNeighbor);

this.BmpRenderTarget.EndDraw();

this.WinRenderTarget.BeginDraw();

this.WinRenderTarget.Clear(SDX.Color.White);

this.WinRenderTarget.DrawBitmap(this.BmpRenderTarget.Bitmap,

new SDX.RectangleF(0f, 0f, bitmap.Size.Width, bitmap.Size.Height),

1.0f, SDX2D.BitmapInterpolationMode.NearestNeighbor);

this.WinRenderTarget.EndDraw();

return this.BmpRenderTarget.Bitmap;

}

画像ファイルへの保存

初期処理で作成したRenderTargetPropertiesを利用し、画像保存用のWicRenderTargetを作成します。
その後、WicRenderTargetに対し、読み込んだ、SharpDX.Direct2D1.Bitmap型のデータを、縮小ドローし、SharpDX.WIC.Bitmap型に格納します。
その後、SharpDX.WIC.Bitmap型->byte[]->System.Drawing.Bitmap型に変換し、
画像ファイルに保存します。

public void SaveFile(SDX2D.Bitmap bitmap, string filename)
{
    int width = (int)this.BmpRenderTarget.Bitmap.Size.Width;
    int height = (int)this.BmpRenderTarget.Bitmap.Size.Height;

    this.WicFactory = new SDX.WIC.ImagingFactory();
    this.WicBitmap = new SDX.WIC.Bitmap(this.WicFactory, width, height, 
        SDX.WIC.PixelFormat.Format32bppBGR, SDX.WIC.BitmapCreateCacheOption.CacheOnLoad);
    this.WicRenderTarget = new SDX2D.WicRenderTarget(this.Factory2D, 
        this.WicBitmap, 
        this.RenderTargetProps);

    this.WicRenderTarget.BeginDraw();
    this.WicRenderTarget.Clear(SDX.Color.White);
    this.WicRenderTarget.DrawBitmap(bitmap, 
        new SDX.RectangleF(0f, 0f, width / 2, height / 2), 
        1.0f, 
        SDX2D.BitmapInterpolationMode.NearestNeighbor);
    this.WicRenderTarget.EndDraw();

    var pixelData = new byte[width * height * 4];
    this.WicBitmap.CopyPixels(pixelData, width * 4);
    var bmp = new System.Drawing.Bitmap(width, height);
    var bd = bmp.LockBits(new System.Drawing.Rectangle(0, 0, width, height), 
        ImageLockMode.WriteOnly,
        System.Drawing.Imaging.PixelFormat.Format32bppPArgb);
    Marshal.Copy(pixelData, 0, bd.Scan0, pixelData.Length);
    bmp.UnlockBits(bd);
    bmp.Save(filename);
}

public void SaveFile(SDX2D.Bitmap bitmap, string filename)

{

int width = (int)this.BmpRenderTarget.Bitmap.Size.Width;

int height = (int)this.BmpRenderTarget.Bitmap.Size.Height;

this.WicFactory = new SDX.WIC.ImagingFactory();

this.WicBitmap = new SDX.WIC.Bitmap(this.WicFactory, width, height,

SDX.WIC.PixelFormat.Format32bppBGR, SDX.WIC.BitmapCreateCacheOption.CacheOnLoad);

this.WicRenderTarget = new SDX2D.WicRenderTarget(this.Factory2D,

this.WicBitmap,

this.RenderTargetProps);

this.WicRenderTarget.BeginDraw();

this.WicRenderTarget.Clear(SDX.Color.White);

this.WicRenderTarget.DrawBitmap(bitmap,

new SDX.RectangleF(0f, 0f, width / 2, height / 2),

1.0f,

SDX2D.BitmapInterpolationMode.NearestNeighbor);

this.WicRenderTarget.EndDraw();

var pixelData = new byte[width * height * 4];

this.WicBitmap.CopyPixels(pixelData, width * 4);

var bmp = new System.Drawing.Bitmap(width, height);

var bd = bmp.LockBits(new System.Drawing.Rectangle(0, 0, width, height),

ImageLockMode.WriteOnly,

System.Drawing.Imaging.PixelFormat.Format32bppPArgb);

Marshal.Copy(pixelData, 0, bd.Scan0, pixelData.Length);

bmp.UnlockBits(bd);

bmp.Save(filename);

}

サンプルクラスの実装

上記のメソッドを順に呼びます。

    var render = new RenderToBitmap(this);
    var btmap = render.LoadFromFile(@"C:\temp\SharpDxTest\image\whale.png");
    var btmap2 = render.DrawBitmap(btmap);
    render.SaveFile(btmap2, @"C:\temp\SharpDxTest\image\whale2.png");