Ejemplo n.º 1
0
 public void Load(Stream stream)
 {
     // Read the first 4 bytes from the stream to determine
     // what kind of image we are loading.
     byte[] magic = new byte [4];
     stream.Read(magic, 0, 4);
     if (magic[0] == (byte)'B' && magic[1] == (byte)'M')
     {
         // Windows bitmap image.
         BmpReader.Load(stream, this);
     }
     else if (magic[0] == 0 && magic[1] == 0 &&
              magic[2] == 1 && magic[3] == 0)
     {
         // Windows icon image.
         IconReader.Load(stream, this, false);
     }
     else if (magic[0] == 0 && magic[1] == 0 &&
              magic[2] == 2 && magic[3] == 0)
     {
         // Windows cursor image (same as icon, with hotspots).
         IconReader.Load(stream, this, true);
     }
     else if (magic[0] == 137 && magic[1] == 80 &&
              magic[2] == 78 && magic[3] == 71)
     {
         // PNG image.
         PngReader.Load(stream, this);
     }
     else if (magic[0] == (byte)'G' && magic[1] == (byte)'I' &&
              magic[2] == (byte)'F' && magic[3] == (byte)'8')
     {
         // GIF image.
         GifReader.Load(stream, this);
     }
     else if (magic[0] == (byte)0xFF && magic[1] == (byte)0xD8)
     {
         // JPEG or EXIF image.
         JpegReader.Load(stream, this, magic, 4);
     }
     else
     {
         // Don't know how to load this kind of file.
         throw new FormatException();
     }
 }
Ejemplo n.º 2
0
        // Load a Windows icon image from the specified stream.  The first
        // 4 bytes have already been read and discarded.  If "hotspots" is
        // "true", then the image is actually a Windows cursor with hotspots.
        public static void Load(Stream stream, Image image, bool hotspots)
        {
            byte[]      buffer = new byte [1024];
            int         offset = 4;
            int         numImages, index;
            int         width, height, bpp;
            PixelFormat format;
            Frame       frame;

            int[] palette;
            int   paletteCount;
            int   paletteIndex;

            // Read the number of images in the file.
            if (stream.Read(buffer, 0, 2) != 2)
            {
                throw new FormatException();
            }
            numImages = Utils.ReadUInt16(buffer, 0);
            offset   += 2;

            // Read the resource directory.
            int[] offsetList = new int [numImages];
            int[] hotspotX   = null;
            int[] hotspotY   = null;
            if (hotspots)
            {
                hotspotX = new int[numImages];
                hotspotY = new int[numImages];
            }
            for (index = 0; index < numImages; ++index)
            {
                if (stream.Read(buffer, 0, 16) != 16)
                {
                    throw new FormatException();
                }
                offset += 16;
                if (hotspots)
                {
                    hotspotX[index] = Utils.ReadUInt16(buffer, 4);
                    hotspotY[index] = Utils.ReadUInt16(buffer, 6);
                }
                offsetList[index] = Utils.ReadInt32(buffer, 12);
            }

            // Read the contents of the images in the stream.
            for (index = 0; index < numImages; ++index)
            {
                // Seek to the start of the image.
                Utils.Seek(stream, offset, offsetList[index]);
                offset = offsetList[index];

                // Read the DIB header.
                if (stream.Read(buffer, 0, 40) != 40)
                {
                    throw new FormatException();
                }
                offset += 40;
                width   = Utils.ReadUInt16(buffer, 4);
                // The DIB height is the mask and the bitmap.
                height = Utils.ReadUInt16(buffer, 8) / 2;
                bpp    = Utils.ReadUInt16(buffer, 14);
                if (bpp == 1)
                {
                    format = PixelFormat.Format1bppIndexed;
                }
                else if (bpp == 4)
                {
                    format = PixelFormat.Format4bppIndexed;
                }
                else if (bpp == 8)
                {
                    format = PixelFormat.Format8bppIndexed;
                }
                else if (bpp == 24)
                {
                    format = PixelFormat.Format24bppRgb;
                }
                else if (bpp == 32)
                {
                    format = PixelFormat.Format32bppArgb;
                }
                else
                {
                    throw new FormatException();
                }

                // Create a new frame for this icon.
                frame = new Frame(image, width, height, format);
                image.AddFrame(frame);
                if (hotspots)
                {
                    frame.HotspotX = hotspotX[index];
                    frame.HotspotY = hotspotY[index];
                }

                // Copy some of the format information up to the image.
                if (frame.Width > image.Width)
                {
                    image.Width = frame.Width;
                }
                if (frame.Height > image.Height)
                {
                    image.Height = frame.Height;
                }
                if (image.NumFrames == 1)
                {
                    image.PixelFormat = format;
                }

                // If indexed, get the palette.
                if ((frame.pixelFormat & PixelFormat.Indexed) != 0)
                {
                    paletteCount =
                        (1 << Utils.FormatToBitCount(frame.pixelFormat));
                    if (stream.Read(buffer, 0, paletteCount * 4)
                        != paletteCount * 4)
                    {
                        throw new FormatException();
                    }
                    offset += paletteCount * 4;
                    palette = new int [paletteCount];
                    for (paletteIndex = 0; paletteIndex < paletteCount;
                         ++paletteIndex)
                    {
                        palette[paletteIndex] = Utils.ReadBGR
                                                    (buffer, paletteIndex * 4);
                    }
                    frame.Palette = palette;
                }

                // Read the main part of the icon or cursor.
                BmpReader.LoadBitmapData(stream, frame, false, true);
                offset += frame.Height * frame.Stride;

                // Read the mask.
                BmpReader.LoadBitmapData(stream, frame, true, true);
                offset += frame.Height * frame.MaskStride;

                // Invert the mask, because we want 1 to mean "active".
                InvertMask(frame);
            }

            // Set the appropriate load format.
            if (hotspots)
            {
                image.LoadFormat = Image.Cursor;
            }
            else
            {
                image.LoadFormat = Image.Icon;
            }
        }