//// 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 GrapeCity.Documents.Drawing;using GrapeCity.Documents.Text;using GrapeCity.Documents.Imaging;using GCTEXT = GrapeCity.Documents.Text;
namespace DsImagingWeb.Demos{    // This sample shows how to enlarge a loaded image    // using different interpolation modes.    public class EnlargeImage    {        public GcBitmap GenerateImage(Size pixelSize, float dpi, bool opaque, string[] sampleParams = null)        {            var origImagePath = Path.Combine("Resources", "Stock", "woman-window-small.jpg");            // Create and clear the target bitmap:            var targetBmp = new GcBitmap(pixelSize.Width, pixelSize.Height, opaque, dpi, dpi);            targetBmp.Clear(Color.Transparent);
            const int fontSize = 16, fpad = 4, xpad = 4, ypad = 3;            TextFormat tf = new TextFormat            {                Font = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", "FreeSerif.ttf")),                FontSize = fontSize,            };            using (var origBmp = new GcBitmap())            {                using (var stm = new FileStream(origImagePath, FileMode.Open, FileAccess.Read, FileShare.Read, 4096, FileOptions.RandomAccess))                    origBmp.Load(stm);
                // Make sure opaqueness of the original bitmap matches the target:                origBmp.Opaque = targetBmp.Opaque;
                // Draw the original with the original size:                targetBmp.BitBlt(origBmp, 0, 0);                using (var g = targetBmp.CreateGraphics(null))                    g.DrawString($"⟵ Original image ({origBmp.Width} by {origBmp.Height} pixels)", tf, new PointF(origBmp.Width + fpad, fpad));                int dy = (int)origBmp.Height + ypad;
                // Enlarge image so that we can have 4 enlarged tiled images preserving aspect ratio:                var f = Math.Min(                    (targetBmp.Width - xpad) / origBmp.Width / 2,                    (targetBmp.Height - ypad - dy) / origBmp.Height / 2);                int twidth = (int)(origBmp.Width * f);                int theight = (int)(origBmp.Height * f);
                // Enlarge and draw 4 copies using the 4 available interpolation modes:                using (var bmp = origBmp.Resize(twidth, theight, InterpolationMode.NearestNeighbor))                    targetBmp.BitBlt(bmp, 0, dy);                drawCaption("InterpolationMode.NearestNeighbor", 0, dy);
                using (var bmp = origBmp.Resize(twidth, theight, InterpolationMode.Linear))                    targetBmp.BitBlt(bmp, 0, dy + theight + ypad);                drawCaption("InterpolationMode.Linear", 0, dy + theight + ypad);
                using (var bmp = origBmp.Resize(twidth, theight, InterpolationMode.Cubic))                    targetBmp.BitBlt(bmp, twidth + xpad, dy);                drawCaption("InterpolationMode.Cubic", twidth + xpad, dy);
                using (var bmp = origBmp.Resize(twidth, theight, InterpolationMode.Downscale))                    targetBmp.BitBlt(bmp, twidth + xpad, dy + theight + ypad);                drawCaption("InterpolationMode.Downscale", twidth + xpad, dy + theight + ypad);                //                void drawCaption(string caption, float x, float y)                {                    using (var g = targetBmp.CreateGraphics(null))                        g.DrawString(caption, tf, new RectangleF(x + fpad, y + theight - fontSize - fpad * 2, twidth - fpad * 2, fontSize + fpad * 2));                }            }            return targetBmp;        }    }}