C# ImageState.EnsurePreRenderBitmap方法代码示例

        protected override RequestedAction PreRenderImage(ImageState s)
        {
            //Skip this when we are doing simulations
            if (s.destGraphics == null) return RequestedAction.None;

            s.ApplyCropping();
            s.EnsurePreRenderBitmap();

            //Parse carve algorithm kind
            FilterType ftype = s.settings.Get<FilterType>("carve", FilterType.None);
            if ("true".Equals(s.settings["carve"], StringComparison.OrdinalIgnoreCase)) ftype = FilterType.Prewitt;
            if (string.IsNullOrEmpty(s.settings["carve"]) && s.settings.Mode == FitMode.Carve) ftype = FilterType.Prewitt;

            //If we have carve data
            CarveDataPlotter carveData = s.Data.ContainsKey(CarveData) ? (s.Data[CarveData] as CarveDataPlotter) : null;
            if (carveData != null && ftype == FilterType.None) ftype = FilterType.Prewitt;

            RectangleF copyRect = s.copyRect;

            if (carveData != null) copyRect = new RectangleF(new PointF(0, 0), s.sourceBitmap.Size);

            if (ftype == FilterType.None) return RequestedAction.None; //Only override rendering when carving is requested.

            //The minimum dimensions of the temporary bitmap.
            SizeF targetSize = PolygonMath.getParallelogramSize(s.layout["image"]);
            targetSize = new SizeF((float)Math.Ceiling(targetSize.Width), (float)Math.Ceiling(targetSize.Height));

            //The size of the temporary bitmap.
            //We want it larger than the size we'll use on the final copy, so we never upscale it
            //- but we also want it as small as possible so processing is fast.
            SizeF tempSize = PolygonMath.ScaleOutside(targetSize, copyRect.Size);
            int tempWidth = (int)Math.Ceiling(tempSize.Width);
            int tempHeight = (int)Math.Ceiling(tempSize.Height);

            //The intermediate and seam carved files
            string tempFile = Path.GetTempFileName();
            string outputTempFile = Path.GetTempFileName();

            try {
                try {

                    //Create a temporary bitmap that is 'halfway resized', so we can efficiently perfom seam carving.

                    //Unless it's already been done for us by FreeImageResize or something
                    if (s.preRenderBitmap != null && (tempWidth - s.preRenderBitmap.Width < 50 && tempHeight - s.preRenderBitmap.Height < 50)) {
                        s.preRenderBitmap.Save(tempFile, ImageFormat.Bmp);
                        tempWidth = s.preRenderBitmap.Width;
                        tempHeight = s.preRenderBitmap.Height;
                    } else {
                        //Create the temporary bitmap and graphics.
                        using (Bitmap temp = new Bitmap(tempWidth, tempHeight, PixelFormat.Format32bppArgb))
                        using (Graphics g = Graphics.FromImage(temp))
                        using (ImageAttributes ia = new ImageAttributes()) {
                            //High quality everthing
                            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
                            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                            g.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
                            g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
                            g.CompositingMode = CompositingMode.SourceOver;
                            ia.SetWrapMode(WrapMode.TileFlipXY);
                            if (s.preRenderBitmap != null) {
                                g.DrawImage(s.preRenderBitmap, new Rectangle(0, 0, tempWidth, tempHeight), 0, 0, s.preRenderBitmap.Width, s.preRenderBitmap.Height, GraphicsUnit.Pixel, ia);
                            } else {
                                g.DrawImage(s.sourceBitmap, new Rectangle(0, 0, tempWidth, tempHeight), copyRect.X, copyRect.Y, copyRect.Width, copyRect.Height, GraphicsUnit.Pixel, ia);
                            }
                            g.Flush(FlushIntention.Flush);
                            //Save
                            temp.Save(tempFile, ImageFormat.Bmp);
                        }
                    }

                    string maskFile = carveData != null ? Path.GetTempFileName() : null;
                    try {
                        if (carveData != null)
                            carveData.SaveBitmapAs(maskFile, tempWidth, tempHeight);

                        Size intTargetSize = new Size((int)targetSize.Width, (int)targetSize.Height);
                        CairJob job = new CairJob();
                        if (maskFile != null) job.WeightPath = maskFile;
                        job.SourcePath = tempFile;
                        job.DestPath = outputTempFile;
                        job.Size = intTargetSize;
                        job.Filter = ftype;
                        job.Timeout = 5000;
                        cair.CairyIt(job);
                    } finally {
                        if (maskFile != null) File.Delete(maskFile);
                    }

                } finally {
                    File.Delete(tempFile);
                }

                //Dispose old intermediate bitmap first
                if (s.preRenderBitmap != null) s.preRenderBitmap.Dispose();

                //Load the new intermediate file from disk
                s.preRenderBitmap = new Bitmap(outputTempFile);
                s.preRenderBitmap.MakeTransparent();

//.........这里部分代码省略.........

        /// <summary>
        /// Process.1 Switches the bitmap to the correct frame or page, and applies source flipping commands
        /// </summary>
        /// <param name="s"></param>
        /// <returns></returns>
        protected override RequestedAction PrepareSourceBitmap(ImageState s)
        {
            if (base.PrepareSourceBitmap(s) == RequestedAction.Cancel) return RequestedAction.Cancel ; //Call extensions

            if (s.sourceBitmap == null) return RequestedAction.None ; //Nothing to do if there is no bitmap

            Bitmap src = s.sourceBitmap;
            ResizeSettings q = s.settings;

            int page = 0;
            if (!string.IsNullOrEmpty(q["page"]) && !int.TryParse(q["page"], NumberStyles.Integer, NumberFormatInfo.InvariantInfo, out page))
                page = 0;

            int frame = 0;
            if (!string.IsNullOrEmpty(q["frame"]) && !int.TryParse(q["frame"], NumberStyles.Integer, NumberFormatInfo.InvariantInfo, out frame))
                frame = 0;

            //So users can use 1-based numbers
            page--; frame--;

            //Support page selection in a .tiff document.
            try {
                //Stay on the last page/frame if out of bounds
                if (page > 0 && page >= src.GetFrameCount(FrameDimension.Page)) page = src.GetFrameCount(FrameDimension.Page) - 1;
                if (frame > 0 && frame >= src.GetFrameCount(FrameDimension.Time)) frame = src.GetFrameCount(FrameDimension.Time) - 1;

                //Select the right page/frame if specified
                if (page > 0) src.SelectActiveFrame(FrameDimension.Page, page);
                if (frame > 0) src.SelectActiveFrame(FrameDimension.Time, frame);
                s.originalSize = s.sourceBitmap.Size;
            } catch (ExternalException) { } //When somebody tries &frame or &page on a single-frame image

            //Flipping has to be done on the original - it can't be done as part of the DrawImage or later, after the borders are drawn.

            if (s.sourceBitmap != null && (s.settings.SourceFlip != RotateFlipType.RotateNoneFlipNone || !string.IsNullOrEmpty(s.settings["sRotate"]))) {
                double angle = s.settings.Get<double>("sRotate",0);

                s.EnsurePreRenderBitmap();
                s.preRenderBitmap.RotateFlip(PolygonMath.CombineFlipAndRotate(s.settings.SourceFlip, angle));
                s.originalSize = s.preRenderBitmap.Size;
            }
            return RequestedAction.None;
        }

        protected override RequestedAction PreRenderImage(ImageState s)
        {
            if (s.sourceBitmap == null) return RequestedAction.None;
            if (!s.settings.WasOneSpecified("a.featheredges")) return RequestedAction.None;

            s.ApplyCropping();
            s.EnsureRGBA();
            s.EnsurePreRenderBitmap();
            ApplyPreFiltersTo(ref s.preRenderBitmap, s);

            return RequestedAction.None;
        }