/// <summary>
/// Internal method for creating Image from Bitmap.
/// </summary>
/// <param name="bitmap">
/// A <see cref="Drawing.Bitmap"/> to be converted into an <see cref="Image"/> instance.
/// </param>
/// <param name="criteria">
/// A <see cref="MediaCodecCriteria"/> that specify image conversion criteria.
/// </param>
/// <returns>
/// It returns a <see cref="Image"/> instance that's equivalent to <paramref name="bitmap"/>.
/// </returns>
/// <exception cref="ArgumentNullException">
/// Exception thrown if <paramref name="bitmap"/> or <see cref="criteria"/> is null.
/// </exception>
internal static Image LoadFromBitmap(Bitmap bitmap, ImageCodecCriteria criteria)
{
if (bitmap == null)
{
throw new ArgumentNullException("bitmap");
}
if (criteria == null)
{
throw new ArgumentNullException("criteria");
}
PixelLayout pType, pConvType;
// Allocate image raster
ConvertPixelFormat(bitmap, out pType);
// Check for hardware/software support
if (pType.IsSupportedInternalFormat() == false)
{
if (criteria.IsSet(ImageCodecCriteria.SoftwareSupport) && ((bool)criteria[ImageCodecCriteria.SoftwareSupport]))
{
// Pixel type not directly supported by hardware... try to guess suitable software conversion
throw new NotImplementedException(String.Format("pixel type {0} is not supported by hardware neither software", pType));
}
else
{
throw new InvalidOperationException(String.Format("pixel type {0} is not supported by hardware", pType));
}
}
else
{
pConvType = pType;
}
Image image = new Image(pType, (uint)bitmap.Width, (uint)bitmap.Height);
switch (bitmap.PixelFormat)
{
case System.Drawing.Imaging.PixelFormat.Format1bppIndexed:
case System.Drawing.Imaging.PixelFormat.Format4bppIndexed:
case System.Drawing.Imaging.PixelFormat.Format8bppIndexed:
if (Khronos.Platform.RunningMono)
{
// Bug 676362 - Bitmap Clone does not format return image to requested PixelFormat
// https://bugzilla.novell.com/show_bug.cgi?id=676362
//
// ATM no mono version has resolved the bug; current workaround is performing image
// sampling pixel by pixel, using internal conversion routines, even if it is very slow
LoadBitmapByPixel(bitmap, image);
}
else
{
LoadBitmapByClone(bitmap, image);
}
break;
default:
LoadBitmapByLockBits(bitmap, image);
break;
}
return(image);
}
/// <summary>
/// Load media from stream.
/// </summary>
/// <param name="stream">
/// A <see cref="Stream"/> where the media data is stored.
/// </param>
/// <param name="criteria">
/// A <see cref="MediaCodecCriteria"/> that specify parameters for loading an media stream.
/// </param>
/// <returns>
/// An <see cref="Image"/> holding the media data.
/// </returns>
/// <exception cref="ArgumentNullException">
/// Exception thrown if <paramref name="stream"/> or <paramref name="criteria"/> is null.
/// </exception>
public Image Load(Stream stream, ImageCodecCriteria criteria)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
if (criteria == null)
{
throw new ArgumentNullException("criteria");
}
using (System.Drawing.Bitmap iBitmap = new System.Drawing.Bitmap(stream)) {
Image image;
PixelLayout pType, pConvType;
// Allocate image raster
ConvertPixelFormat(iBitmap, out pType);
// Check for hardware/software support
if (pType.IsSupportedInternalFormat() == false)
{
if (criteria.IsSet(ImageCodecCriteria.SoftwareSupport) && (bool)criteria[ImageCodecCriteria.SoftwareSupport])
{
// Pixel type not directly supported by hardware... try to guess suitable software conversion
pConvType = Pixel.GuessBestSupportedConvertion(pType);
if (pConvType == PixelLayout.None)
{
throw new InvalidOperationException("pixel type " + pType.ToString() + " is not supported by hardware neither software");
}
}
else
{
throw new InvalidOperationException("pixel type " + pType.ToString() + " is not supported by hardware");
}
}
else
{
pConvType = pType;
}
image = new Image();
image.Create(pType, (uint)iBitmap.Width, (uint)iBitmap.Height);
switch (iBitmap.PixelFormat)
{
case System.Drawing.Imaging.PixelFormat.Format1bppIndexed:
case System.Drawing.Imaging.PixelFormat.Format4bppIndexed:
case System.Drawing.Imaging.PixelFormat.Format8bppIndexed:
if (Platform.RunningMono)
{
// Bug 676362 - Bitmap Clone does not format return image to requested PixelFormat
// https://bugzilla.novell.com/show_bug.cgi?id=676362
//
// ATM no mono version has resolved the bug; current workaround is performing image
// sampling pixel by pixel, using internal conversion routines, even if it is very slow
LoadBitmapByPixel(iBitmap, image);
}
else
{
LoadBitmapByClone(iBitmap, image);
}
break;
default:
LoadBitmapByLockBits(iBitmap, image);
break;
}
// ConvertItemType image to supported format, if necessary
if ((pConvType != PixelLayout.None) && (pConvType != pType))
{
image = image.Convert(pConvType);
}
return(image);
}
}
