//// This code is part of Document Solutions for Imaging demos.// Copyright (c) MESCIUS inc. All rights reserved.//using System;using System.IO;using System.Drawing;using System.Collections.Generic;using System.Linq;using GrapeCity.Documents.Imaging;
namespace DsImagingWeb.Demos{    // This sample loads the image of a goldfish (same as the one used in BmpTransforms)    // and applies different transformations to it, creating a number of frames that    // are combined to produce an animated GIF.    public class MakeGif    {        public string DefaultMime { get => Common.Util.MimeTypes.GIF; }
        public Stream GenerateImageStream(string targetMime, Size pixelSize, float dpi, bool opaque, string[] sampleParams = null)        {            if (targetMime != Common.Util.MimeTypes.GIF)                throw new Exception("This sample only supports GIF output format.");
            // Keep GIF size reasonable:            var side2 = Math.Min(400, Math.Min(pixelSize.Width, pixelSize.Height));
            // Prepare frames for the target GIF flipping/rotating a single image:            var move1 = new GcBitmap[2];            var move2 = new GcBitmap[3];            using (var bmpSrc = new GcBitmap(Path.Combine("Resources", "Stock", "goldfish.jpg")))            {                bmpSrc.Opaque = opaque;                // Adjust straight and flipped images to try and keep the fish's head motionless:                using (var tbmp = bmpSrc.Resize(side2, side2))                {                    move1[0] = new GcBitmap(tbmp.PixelWidth, tbmp.PixelHeight, tbmp.Opaque, tbmp.DpiX, tbmp.DpiY);                    move1[0].Clear(Color.White);                    move1[0].BitBlt(tbmp, -(int)(side2 / 14f), 0);                }                using (var tbmp = move1[0].FlipRotate(FlipRotateAction.FlipHorizontal))                {                    move1[1] = new GcBitmap(tbmp.PixelWidth, tbmp.PixelHeight, tbmp.Opaque, tbmp.DpiX, tbmp.DpiY);                    move1[1].Clear(Color.White);                    move1[1].BitBlt(tbmp, (int)(side2 / 14f), 0);                    move1[1].BitBlt(tbmp, 0, 0);                }                move2[0] = move1[0].FlipRotate(FlipRotateAction.Rotate90);                move2[1] = move1[0].FlipRotate(FlipRotateAction.Rotate180);                move2[2] = move1[0].FlipRotate(FlipRotateAction.Rotate270);            }            // Combine the moves:            var bmps = new List<GcBitmap>();            for (int i = 0; i < 4; ++i)            {                bmps.Add(move1[0]);                bmps.Add(move1[1]);            }            bmps.Add(move1[0]);            for (int i = 0; i < 2; ++i)            {                bmps.Add(move1[0]);                bmps.Add(move2[0]);                bmps.Add(move2[1]);                bmps.Add(move2[2]);            }            bmps.Add(move1[0]);            // Create the GIF:            var ms = new MemoryStream();            using (var gw = new GcGifWriter(ms))            {                gw.LogicalScreenWidth = bmps[0].PixelWidth;                gw.LogicalScreenHeight = bmps[0].PixelHeight;                gw.PixelAspectRatio = 1;                gw.AllowAddingTransparentColor = false;
                foreach (var bmp in bmps)                    gw.AppendFrame(bmp, 255, 0, 0, GifDisposalMethod.DoNotDispose, 16);            }            // Dispose bitmaps used to create GIF frames:            foreach (var bmp in bmps.Distinct())                bmp.Dispose();
            ms.Seek(0, SeekOrigin.Begin);            return ms;        }    }}