Example #1
0
        /// <summary>
        /// 对gif动画添加水印
        /// </summary>
        /// <param name="gifFilePath">原gif动画的路径</param>
        /// <param name="text">水印文字</param>
        /// <param name="textForceColor">水印文字的颜色,因为gif不是真彩色图片,所以在显示的时候,该颜色可能有所误差,但基本上可以确定颜色范围</param>
        /// <param name="font">字体</param>
        /// <param name="x">水印位置横坐标</param>
        /// <param name="y">水印位置纵坐标</param>
        /// <param name="outputPath">输出路径</param>
        public static void WaterMark(string gifFilePath, SizeMode sizeMode, string text, Color textForceColor, Font font, float x, float y, string outputPath)
        {
            if (!File.Exists(gifFilePath))
            {
                throw new IOException(string.Format("文件{0}不存在!", gifFilePath));
            }
            using (Bitmap ora_Img = new Bitmap(gifFilePath))
            {
                if (ora_Img.RawFormat.Guid != ImageFormat.Gif.Guid)
                {
                    throw new IOException(string.Format("文件{0}!", gifFilePath));
                }
            }
            GifImage gifImage = GifDecoder.Decode(gifFilePath);

            if (sizeMode == SizeMode.Large)
            {
                ThinkDisposalMethod(gifImage);
            }
            Color textColor  = textForceColor;
            int   frameCount = 0;

            foreach (GifFrame f in gifImage.Frames)
            {
                if ((sizeMode == SizeMode.Normal && frameCount++ == 0) || sizeMode == SizeMode.Large)
                {
                    Graphics g = Graphics.FromImage(f.Image);
                    g.DrawString(text, font, new SolidBrush(textColor), new PointF(x, y));
                    g.Dispose();
                    bool      hasTextColor = false;
                    Color32[] colors       = PaletteHelper.GetColor32s(f.LocalColorTable);
                    foreach (Color32 c in colors)
                    {
                        if (c.ARGB == textColor.ToArgb())
                        {
                            hasTextColor = true;
                            break;
                        }
                    }
                    if (!hasTextColor)
                    {
                        if (f.Palette.Length < 256)
                        {
                            int       newSize   = f.Palette.Length * 2;
                            Color32[] newColors = new Color32[newSize];
                            newColors[f.Palette.Length] = new Color32(textColor.ToArgb());
                            Array.Copy(colors, newColors, colors.Length);
                            byte[] lct   = new byte[newColors.Length * 3];
                            int    index = 0;
                            foreach (Color32 c in newColors)
                            {
                                lct[index++] = c.Red;
                                lct[index++] = c.Green;
                                lct[index++] = c.Blue;
                            }
                            f.LocalColorTable         = lct;
                            f.ImageDescriptor.LctFlag = true;
                            f.ImageDescriptor.LctSize = newSize;
                            f.ColorDepth = f.ColorDepth + 1;
                        }
                        else
                        {
                            OcTreeQuantizer q          = new OcTreeQuantizer(8);
                            Color32[]       cs         = q.Quantizer(f.Image);
                            byte[]          lct        = new byte[cs.Length * 3];
                            int             index      = 0;
                            int             colorCount = 0;
                            foreach (Color32 c in cs)
                            {
                                lct[index++] = c.Red;
                                lct[index++] = c.Green;
                                lct[index++] = c.Blue;
                                if (c.ARGB == f.BgColor.ARGB)
                                {
                                    f.GraphicExtension.TranIndex = (byte)colorCount;
                                }
                                colorCount++;
                            }
                            Quantizer(f.Image, cs);
                            f.LocalColorTable         = lct;
                            f.ImageDescriptor.LctFlag = true;
                            f.ImageDescriptor.LctSize = 256;
                            f.ColorDepth = 8;
                        }
                    }
                }
            }
            GifEncoder.Encode(gifImage, outputPath);
        }
Example #2
0
        /// <summary>
        /// Gif动画单色化
        /// </summary>
        /// <param name="gifFilePath">原动画路径</param>
        /// <param name="outputPath">单色后动画路径</param>
        public static void Monochrome(string gifFilePath, string outputPath)
        {
            if (!File.Exists(gifFilePath))
            {
                throw new IOException(string.Format("文件{0}不存在!", gifFilePath));
            }
            using (Bitmap ora_Img = new Bitmap(gifFilePath))
            {
                if (ora_Img.RawFormat.Guid != ImageFormat.Gif.Guid)
                {
                    throw new IOException(string.Format("文件{0}!", gifFilePath));
                }
            }
            GifImage gifImage   = GifDecoder.Decode(gifFilePath);
            int      transIndex = gifImage.LogicalScreenDescriptor.BgColorIndex;
            int      c1         = (255 << 24) | (158 << 16) | (128 << 8) | 128;
            int      c2         = (255 << 24) | (0 << 16) | (0 << 8) | 0;
            int      c3         = (255 << 24) | (255 << 16) | (255 << 8) | 255;
            int      c4         = (255 << 24) | (0 << 16) | (0 << 8) | 0;

            int[]  palette = new int[] { c1, c2, c3, c4 };
            byte[] buffer  = new byte[12] {
                128, 128, 128, 0, 0, 0, 255, 255, 255, 0, 0, 0
            };
            gifImage.GlobalColorTable = buffer;
            gifImage.LogicalScreenDescriptor.BgColorIndex         = 0;
            gifImage.LogicalScreenDescriptor.GlobalColorTableSize = 4;
            gifImage.LogicalScreenDescriptor.GlobalColorTableFlag = true;
            int index = 0;

            foreach (GifFrame f in gifImage.Frames)
            {
                Color32[] act = PaletteHelper.GetColor32s(f.LocalColorTable);
                f.LocalColorTable = buffer;
                Color      bgC     = act[(transIndex / 3)].Color;
                byte       bgGray  = (byte)(bgC.R * 0.3 + bgC.G * 0.59 + bgC.B * 0.11);
                BitmapData bmpData = f.Image.LockBits(new Rectangle(0, 0, f.Image.Width, f.Image.Height), ImageLockMode.ReadWrite, f.Image.PixelFormat);
                unsafe
                {
                    int *p = (int *)bmpData.Scan0.ToPointer();
                    for (int i = 0; i < f.Image.Width * f.Image.Height; i++)
                    {
                        if (p[i] == 0)
                        {
                            p[i] = c1;
                        }
                        else
                        {
                            Color c    = Color.FromArgb(p[i]);
                            int   gray = (byte)(c.R * 0.3 + c.G * 0.59 + c.B * 0.11);
                            if (gray > bgGray)
                            {
                                if (bgGray > 128)
                                {
                                    p[i] = c2;
                                }
                                else
                                {
                                    p[i] = c3;
                                }
                            }
                            else if (gray < bgGray)
                            {
                                if (bgGray > 128)
                                {
                                    p[i] = c3;
                                }
                                else
                                {
                                    p[i] = c2;
                                }
                            }
                            else
                            {
                                p[i] = c1;
                            }
                        }
                    }
                }
                f.Image.UnlockBits(bmpData);
                f.GraphicExtension.TranIndex = 0;
                f.ColorDepth = 2;
                f.ImageDescriptor.LctFlag = false;
                index++;
            }
            GifEncoder.Encode(gifImage, outputPath);
        }