Exemple #1
0
		/// <summary>Construct a canvas with the specified bitmap to draw into.</summary>
		/// <remarks>
		/// Construct a canvas with the specified bitmap to draw into. The bitmap
		/// must be mutable.
		/// <p>The initial target density of the canvas is the same as the given
		/// bitmap's density.
		/// </remarks>
		/// <param name="bitmap">Specifies a mutable bitmap for the canvas to draw into.</param>
		public Canvas(android.graphics.Bitmap bitmap)
		{
			if (!bitmap.isMutable())
			{
				throw new System.InvalidOperationException("Immutable bitmap passed to Canvas constructor"
					);
			}
			throwIfRecycled(bitmap);
			mNativeCanvas = initRaster(bitmap.nativeInstance);
			mBitmap = bitmap;
			mDensity = bitmap.mDensity;
		}
Exemple #2
0
		/// <summary>
		/// Returns an immutable bitmap from subset of the source bitmap,
		/// transformed by the optional matrix.
		/// </summary>
		/// <remarks>
		/// Returns an immutable bitmap from subset of the source bitmap,
		/// transformed by the optional matrix.  It is
		/// initialized with the same density as the original bitmap.
		/// </remarks>
		/// <param name="source">The bitmap we are subsetting</param>
		/// <param name="x">The x coordinate of the first pixel in source</param>
		/// <param name="y">The y coordinate of the first pixel in source</param>
		/// <param name="width">The number of pixels in each row</param>
		/// <param name="height">The number of rows</param>
		/// <param name="m">Optional matrix to be applied to the pixels</param>
		/// <param name="filter">
		/// true if the source should be filtered.
		/// Only applies if the matrix contains more than just
		/// translation.
		/// </param>
		/// <returns>A bitmap that represents the specified subset of source</returns>
		/// <exception cref="System.ArgumentException">
		/// if the x, y, width, height values are
		/// outside of the dimensions of the source bitmap.
		/// </exception>
		public static android.graphics.Bitmap createBitmap(android.graphics.Bitmap source
			, int x, int y, int width, int height, android.graphics.Matrix m, bool filter)
		{
			checkXYSign(x, y);
			checkWidthHeight(width, height);
			if (x + width > source.getWidth())
			{
				throw new System.ArgumentException("x + width must be <= bitmap.width()");
			}
			if (y + height > source.getHeight())
			{
				throw new System.ArgumentException("y + height must be <= bitmap.height()");
			}
			// check if we can just return our argument unchanged
			if (!source.isMutable() && x == 0 && y == 0 && width == source.getWidth() && height
				 == source.getHeight() && (m == null || m.isIdentity()))
			{
				return source;
			}
			int neww = width;
			int newh = height;
			android.graphics.Canvas canvas = new android.graphics.Canvas();
			android.graphics.Bitmap bitmap;
			android.graphics.Paint paint;
			android.graphics.Rect srcR = new android.graphics.Rect(x, y, x + width, y + height
				);
			android.graphics.RectF dstR = new android.graphics.RectF(0, 0, width, height);
			android.graphics.Bitmap.Config newConfig = android.graphics.Bitmap.Config.ARGB_8888;
			android.graphics.Bitmap.Config config = source.getConfig();
			// GIF files generate null configs, assume ARGB_8888
			if (config != null)
			{
				switch (config)
				{
					case android.graphics.Bitmap.Config.RGB_565:
					{
						newConfig = android.graphics.Bitmap.Config.RGB_565;
						break;
					}

					case android.graphics.Bitmap.Config.ALPHA_8:
					{
						newConfig = android.graphics.Bitmap.Config.ALPHA_8;
						break;
					}

					case android.graphics.Bitmap.Config.ARGB_4444:
					case android.graphics.Bitmap.Config.ARGB_8888:
					default:
					{
						//noinspection deprecation
						newConfig = android.graphics.Bitmap.Config.ARGB_8888;
						break;
					}
				}
			}
			if (m == null || m.isIdentity())
			{
				bitmap = createBitmap(neww, newh, newConfig, source.hasAlpha());
				paint = null;
			}
			else
			{
				// not needed
				bool transformed = !m.rectStaysRect();
				android.graphics.RectF deviceR = new android.graphics.RectF();
				m.mapRect(deviceR, dstR);
				neww = Sharpen.Util.Round(deviceR.width());
				newh = Sharpen.Util.Round(deviceR.height());
				bitmap = createBitmap(neww, newh, transformed ? android.graphics.Bitmap.Config.ARGB_8888
					 : newConfig, transformed || source.hasAlpha());
				canvas.translate(-deviceR.left, -deviceR.top);
				canvas.concat(m);
				paint = new android.graphics.Paint();
				paint.setFilterBitmap(filter);
				if (transformed)
				{
					paint.setAntiAlias(true);
				}
			}
			// The new bitmap was created from a known bitmap source so assume that
			// they use the same density
			bitmap.mDensity = source.mDensity;
			canvas.setBitmap(bitmap);
			canvas.drawBitmap(source, srcR, dstR, paint);
			canvas.setBitmap(null);
			return bitmap;
		}
Exemple #3
0
		/// <summary>Specify a bitmap for the canvas to draw into.</summary>
		/// <remarks>
		/// Specify a bitmap for the canvas to draw into.  As a side-effect, also
		/// updates the canvas's target density to match that of the bitmap.
		/// </remarks>
		/// <param name="bitmap">Specifies a mutable bitmap for the canvas to draw into.</param>
		/// <seealso cref="setDensity(int)">setDensity(int)</seealso>
		/// <seealso cref="getDensity()">getDensity()</seealso>
		public virtual void setBitmap(android.graphics.Bitmap bitmap)
		{
			if (isHardwareAccelerated())
			{
				throw new java.lang.RuntimeException("Can't set a bitmap device on a GL canvas");
			}
			android.graphics.Bitmap.NativeBitmap pointer = null;
			if (bitmap != null)
			{
				if (!bitmap.isMutable())
				{
					throw new System.InvalidOperationException();
				}
				throwIfRecycled(bitmap);
				mDensity = bitmap.mDensity;
				pointer = bitmap.nativeInstance;
			}
			native_setBitmap(mNativeCanvas, pointer);
			mBitmap = bitmap;
		}