//// This code is part of Document Solutions for Imaging demos.// Copyright (c) MESCIUS inc. All rights reserved.//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 demonstrates composing two images using the available blending modes.    // The sample uses the same approach as the BlendingModes sample,    // but instead of showing a few of the available modes that produce    // a nice looking result, demonstrates all of them in smaller scale.    // The base and the blended images used as the same as in the BlendingModes sample.    // See also BlendImages_0 and BlendText samples.    public class AllBlendingModes    {        public GcBitmap GenerateImage(Size pixelSize, float dpi, bool opaque, string[] sampleParams = null)        {            var bmp = new GcBitmap(pixelSize.Width, pixelSize.Height, opaque, dpi, dpi);            using (var origBmp = new GcBitmap())            using (var spectrumBmp = new GcBitmap())            {                // Load a sample photo:                var imagePath = Path.Combine("Resources", "ImagesBis", "orchid.jpg");                using (var stm = new FileStream(imagePath, FileMode.Open, FileAccess.Read, FileShare.Read, 4096, FileOptions.RandomAccess))                    origBmp.Load(stm);
                // Blending source:                var spectrumPath = Path.Combine("Resources", "ImagesBis", "spectrum-pastel-500x500.png");                using (var stm = new FileStream(spectrumPath, FileMode.Open, FileAccess.Read, FileShare.Read, 4096, FileOptions.RandomAccess))                    spectrumBmp.Load(stm);
                origBmp.Opaque = spectrumBmp.Opaque = opaque;
                // Resize the original photo so we can place 4 samples of it                // on the resulting bitmap:                int w = pixelSize.Width / 4;                int h = pixelSize.Height / 4;                using (var g = bmp.CreateGraphics())                {                    // Prepare for captions:                    var tl = g.CreateTextLayout();                    tl.DefaultFormat.Font = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", "FreeMono.ttf"));                    tl.DefaultFormat.FontSize = 12;                    tl.ParagraphAlignment = ParagraphAlignment.Center;                    tl.TextAlignment = TextAlignment.Center;                    tl.MaxWidth = w;                    tl.MaxHeight = h;                    tl.MarginTop = h - g.MeasureString("QWERTY", tl.DefaultFormat).Height * 1.4f;                    // Render all 16 blending modes in a 4x4 grid:                    using (var sizedBmp = origBmp.Resize(w, h, InterpolationMode.Cubic))                    using (var sizedSpectrumBmp = spectrumBmp.Resize(w, h))                    {                        for (int row = 0; row < 4; ++row)                            for (int col = 0; col < 4; ++col)                            {                                // Sample:                                var blendMode = (BlendMode)(row * 4 + col);                                int x = w * col, y = h * row;                                bmp.BitBlt(sizedBmp, x, y);                                bmp.CompositeAndBlend(sizedSpectrumBmp, x, y, CompositeMode.SourceOver, blendMode);                                // Caption:                                tl.Clear();                                tl.Append(blendMode.ToString());                                tl.PerformLayout(true);                                var rc = tl.ContentRectangle;                                rc.Offset(x, y);                                rc.Inflate(4, 2);                                g.FillRectangle(rc, Color.White);                                g.DrawTextLayout(tl, new PointF(x, y));                            }                    }                }            }            return bmp;        }    }}