/// <summary>Decode an input stream into a bitmap.</summary>
/// <remarks>
/// Decode an input stream into a bitmap. If the input stream is null, or
/// cannot be used to decode a bitmap, the function returns null.
/// The stream's position will be where ever it was after the encoded data
/// was read.
/// </remarks>
/// <param name="is">
/// The input stream that holds the raw data to be decoded into a
/// bitmap.
/// </param>
/// <param name="outPadding">
/// If not null, return the padding rect for the bitmap if
/// it exists, otherwise set padding to [-1,-1,-1,-1]. If
/// no bitmap is returned (null) then padding is
/// unchanged.
/// </param>
/// <param name="opts">
/// null-ok; Options that control downsampling and whether the
/// image should be completely decoded, or just is size returned.
/// </param>
/// <returns>
/// The decoded bitmap, or null if the image data could not be
/// decoded, or, if opts is non-null, if opts requested only the
/// size be returned (in opts.outWidth and opts.outHeight)
/// </returns>
public static android.graphics.Bitmap decodeStream(java.io.InputStream @is, android.graphics.Rect
outPadding, android.graphics.BitmapFactory.Options opts)
{
// we don't throw in this case, thus allowing the caller to only check
// the cache, and not force the image to be decoded.
if (@is == null)
{
return(null);
}
// we need mark/reset to work properly
if ([email protected]())
{
@is = new java.io.BufferedInputStream(@is, 16 * 1024);
}
// so we can call reset() if a given codec gives up after reading up to
// this many bytes. FIXME: need to find out from the codecs what this
// value should be.
@is.mark(1024);
android.graphics.Bitmap bm;
if (@is is android.content.res.AssetManager.AssetInputStream)
{
bm = nativeDecodeAsset(((android.content.res.AssetManager.AssetInputStream)@is).mAsset
, outPadding, opts);
}
else
{
// pass some temp storage down to the native code. 1024 is made up,
// but should be large enough to avoid too many small calls back
// into is.read(...) This number is not related to the value passed
// to mark(...) above.
byte[] tempStorage = null;
if (opts != null)
{
tempStorage = opts.inTempStorage;
}
if (tempStorage == null)
{
tempStorage = new byte[16 * 1024];
}
bm = nativeDecodeStream(@is, tempStorage, outPadding, opts);
}
if (bm == null && opts != null && opts.inBitmap != null)
{
throw new System.ArgumentException("Problem decoding into existing bitmap");
}
return(finishDecode(bm, outPadding, opts));
}
/// <summary>Decode an input stream into a bitmap.</summary>
/// <remarks>
/// Decode an input stream into a bitmap. If the input stream is null, or
/// cannot be used to decode a bitmap, the function returns null.
/// The stream's position will be where ever it was after the encoded data
/// was read.
/// </remarks>
/// <param name="is">
/// The input stream that holds the raw data to be decoded into a
/// bitmap.
/// </param>
/// <param name="outPadding">
/// If not null, return the padding rect for the bitmap if
/// it exists, otherwise set padding to [-1,-1,-1,-1]. If
/// no bitmap is returned (null) then padding is
/// unchanged.
/// </param>
/// <param name="opts">
/// null-ok; Options that control downsampling and whether the
/// image should be completely decoded, or just is size returned.
/// </param>
/// <returns>
/// The decoded bitmap, or null if the image data could not be
/// decoded, or, if opts is non-null, if opts requested only the
/// size be returned (in opts.outWidth and opts.outHeight)
/// </returns>
public static android.graphics.Bitmap decodeStream(java.io.InputStream @is, android.graphics.Rect
outPadding, android.graphics.BitmapFactory.Options opts)
{
// we don't throw in this case, thus allowing the caller to only check
// the cache, and not force the image to be decoded.
if (@is == null)
{
return null;
}
// we need mark/reset to work properly
if ([email protected]())
{
@is = new java.io.BufferedInputStream(@is, 16 * 1024);
}
// so we can call reset() if a given codec gives up after reading up to
// this many bytes. FIXME: need to find out from the codecs what this
// value should be.
@is.mark(1024);
android.graphics.Bitmap bm;
if (@is is android.content.res.AssetManager.AssetInputStream)
{
bm = nativeDecodeAsset(((android.content.res.AssetManager.AssetInputStream)@is).mAsset
, outPadding, opts);
}
else
{
// pass some temp storage down to the native code. 1024 is made up,
// but should be large enough to avoid too many small calls back
// into is.read(...) This number is not related to the value passed
// to mark(...) above.
byte[] tempStorage = null;
if (opts != null)
{
tempStorage = opts.inTempStorage;
}
if (tempStorage == null)
{
tempStorage = new byte[16 * 1024];
}
bm = nativeDecodeStream(@is, tempStorage, outPadding, opts);
}
if (bm == null && opts != null && opts.inBitmap != null)
{
throw new System.ArgumentException("Problem decoding into existing bitmap");
}
return finishDecode(bm, outPadding, opts);
}