//// 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;using GCDRAW = GrapeCity.Documents.Drawing;
namespace DsImagingWeb.Demos{    // This sample demonstrates composing two images using a few    // of the many available blending modes.    // The base image is a photo of a white orchid on a dark background.    // The blended image is a simple spectrum (thumbnail shown in the bottom right corner).    // See the AllBlendingModes sample for a demo of all available blending modes.    public class BlendingModes    {        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-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 / 2;                int h = pixelSize.Height / 2;                using (var sizedBmp = origBmp.Resize(w, h, InterpolationMode.Cubic))                using (var sizedSpectrumBmp = spectrumBmp.Resize(w, h))                {                    // Resized original image:                    bmp.BitBlt(sizedBmp, 0, 0);
                    // Blending mode Color:                    bmp.BitBlt(sizedBmp, w, 0);                    bmp.CompositeAndBlend(sizedSpectrumBmp, w, 0, CompositeMode.SourceOver, BlendMode.Color);
                    // Blending mode SoftLight:                    bmp.BitBlt(sizedBmp, 0, h);                    bmp.CompositeAndBlend(sizedSpectrumBmp, 0, h, CompositeMode.SourceOver, BlendMode.SoftLight);
                    // Blending mode Hue:                    bmp.BitBlt(sizedBmp, w, h);                    bmp.CompositeAndBlend(sizedSpectrumBmp, w, h, CompositeMode.SourceOver, BlendMode.Hue);                }                // Show a thumbnail of the blend source in the bottom right corner:                using (var spectrumThumbnail = spectrumBmp.Resize(w / 4, h / 4))                    bmp.BitBlt(spectrumThumbnail, pixelSize.Width - spectrumThumbnail.PixelWidth, pixelSize.Height - spectrumThumbnail.PixelHeight);                // Add borders between the quadrants, and captions for each:                var lineh = 2;                using (var g = bmp.CreateGraphics(null))                {                    var foreColor = Color.Yellow;                    var backColor = Color.Blue;                    var font = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", "FreeMono.ttf"));                    g.DrawLine(w, 0, w, h * 2, new GCDRAW.Pen(Color.Gray, lineh * 2));                    g.DrawLine(0, h, w * 2, h, new GCDRAW.Pen(Color.Gray, lineh * 2));                    var tf = new TextFormat() { Font = font, FontSize = 18, ForeColor = foreColor, BackColor = backColor, FontBold = true };                    var th = g.MeasureString("QWERTY", tf).Height;                    g.DrawString(" Original image ", tf, new PointF(0, h - th + lineh));                    g.DrawString(" BlendMode.Color ", tf, new PointF(w + lineh, h - th + lineh));                    g.DrawString(" BlendMode.SoftLight ", tf, new PointF(0, h * 2 + lineh - th + lineh));                    g.DrawString(" BlendMode.Hue ", tf, new PointF(w + lineh, h * 2 + lineh - th + lineh));                }            }            return bmp;        }    }}