java.nio.IntBuffer#wrap ( )源码实例Demo

public static Buffer getPixels(final Bitmap pBitmap, final PixelFormat pPixelFormat, final ByteOrder pByteOrder) {
	final int[] pixelsARGB_8888 = GLHelper.getPixelsARGB_8888(pBitmap);

	switch(pPixelFormat) {
		case RGB_565:
			return ShortBuffer.wrap(GLHelper.convertARGB_8888toRGB_565(pixelsARGB_8888, pByteOrder)); // TODO Is ShortBuffer or IntBuffer faster?
		case RGBA_8888:
			// HACK =(
			final ByteOrder reverseByteOrder = (pByteOrder == ByteOrder.LITTLE_ENDIAN) ? ByteOrder.BIG_ENDIAN : ByteOrder.LITTLE_ENDIAN;
			return IntBuffer.wrap(GLHelper.convertARGB_8888toRGBA_8888(pixelsARGB_8888, reverseByteOrder));
		case RGBA_4444:
			return ShortBuffer.wrap(GLHelper.convertARGB_8888toRGBA_4444(pixelsARGB_8888, pByteOrder)); // TODO Is ShortBuffer or IntBuffer faster?
		case A_8:
			return ByteBuffer.wrap(GLHelper.convertARGB_8888toA_8(pixelsARGB_8888));
		default:
			throw new IllegalArgumentException("Unexpected " + PixelFormat.class.getSimpleName() + ": '" + pPixelFormat + "'.");
	}
}
 

private Bitmap createBitmapFromGLSurface(int w, int h, GL10 gl) {

        int bitmapBuffer[] = new int[w * h];
        int bitmapSource[] = new int[w * h];
        IntBuffer intBuffer = IntBuffer.wrap(bitmapBuffer);
        intBuffer.position(0);

        try {
            gl.glReadPixels(0, 0, w, h, GL10.GL_RGBA, GL10.GL_UNSIGNED_BYTE, intBuffer);
            int offset1, offset2, texturePixel, blue, red, pixel;
            for (int i = 0; i < h; i++) {
                offset1 = i * w;
                offset2 = (h - i - 1) * w;
                for (int j = 0; j < w; j++) {
                    texturePixel = bitmapBuffer[offset1 + j];
                    blue = (texturePixel >> 16) & 0xff;
                    red = (texturePixel << 16) & 0x00ff0000;
                    pixel = (texturePixel & 0xff00ff00) | red | blue;
                    bitmapSource[offset2 + j] = pixel;
                }
            }
        } catch (GLException e) {
            Log.e("CreateBitmap", "createBitmapFromGLSurface: " + e.getMessage(), e);
            return null;
        }

        return Bitmap.createBitmap(bitmapSource, w, h, Bitmap.Config.ARGB_8888);
    }
 

/**
 * Return an IntBuffer that accesses the major version number.
 * This is used to create a Monitor object for this value.
 *
 * @return IntBuffer - a ByteBuffer that accesses the major version number
 *                     in the instrumentation buffer header.
 */
public IntBuffer majorVersionBuffer() {
    int[] holder = new int[1];
    holder[0] = getMajorVersion();
    IntBuffer ib = IntBuffer.wrap(holder);
    ib.limit(1);
    return ib;
  }
 

/**
 * Return an IntBuffer that accesses the major version number.
 * This is used to create a Monitor object for this value.
 *
 * @return IntBuffer - a ByteBuffer that accesses the major version number
 *                     in the instrumentation buffer header.
 */
public IntBuffer majorVersionBuffer() {
    int[] holder = new int[1];
    holder[0] = getMajorVersion();
    IntBuffer ib = IntBuffer.wrap(holder);
    ib.limit(1);
    return ib;
  }
 

public static Bitmap createBitmapFromGLSurface(int x, int y, int w, int h, int glHeight)
        throws OutOfMemoryError {
    int bitmapBuffer[] = new int[w * h];
    int bitmapSource[] = new int[w * h];
    IntBuffer intBuffer = IntBuffer.wrap(bitmapBuffer);
    intBuffer.position(0);

    try {
        GLES11.glReadPixels(x, glHeight - h - y, w, h, GL10.GL_RGBA, GL10.GL_UNSIGNED_BYTE, intBuffer);
        int offset1, offset2;
        for (int i = 0; i < h; i++) {
            offset1 = i * w;
            offset2 = (h - i - 1) * w;
            for (int j = 0; j < w; j++) {
                int texturePixel = bitmapBuffer[offset1 + j];
                int blue = (texturePixel >> 16) & 0xff;
                int red = (texturePixel << 16) & 0x00ff0000;
                int pixel = (texturePixel & 0xff00ff00) | red | blue;
                bitmapSource[offset2 + j] = pixel;
            }
        }
    } catch (GLException e) {
        return null;
    }

    return Bitmap.createBitmap(bitmapSource, w, h, Bitmap.Config.ARGB_8888);
}
 

/**
 * Return an IntBuffer that accesses the major version number.
 * This is used to create a Monitor object for this value.
 *
 * @return IntBuffer - a ByteBuffer that accesses the major version number
 *                     in the instrumentation buffer header.
 */
public IntBuffer majorVersionBuffer() {
    int[] holder = new int[1];
    holder[0] = getMajorVersion();
    IntBuffer ib = IntBuffer.wrap(holder);
    ib.limit(1);
    return ib;
  }
 

/**
 * Return an IntBuffer that accesses the minor version number.
 * This is used to create a Monitor object for this value.
 *
 * @return IntBuffer - a ByteBuffer that accesses the minor version number
 *                     in the instrumentation buffer header.
 */
public IntBuffer minorVersionBuffer() {
    int[] holder = new int[1];
    holder[0] = getMinorVersion();
    IntBuffer ib = IntBuffer.wrap(holder);
    ib.limit(1);
    return ib;
}
 

public static void decodeBlockPack(
        IntBuffer src,
        IntFilterFactory filterFactory,
        IntBitPacking packer,
        IntOutputStream dst)
{
    // Fetch length of original array.
    if (!src.hasRemaining()) {
        return;
    }
    final int outLen = (int)src.get() - 1;

    // Fetch and output first int, and set it as delta's initial context.
    final int first = src.get();
    dst.write(first);
    IntFilter filter = filterFactory.newFilter(first);

    // Decompress intermediate blocks.
    final int chunkSize = packer.getBlockSize();
    final int chunkNum = outLen / chunkSize;
    if (chunkNum > 0) {
        packer.decompress(src, dst, filter, chunkNum);
    }

    // Decompress last block.
    final int chunkRemain = outLen % chunkSize;
    if (chunkRemain > 0) {
        int[] last = new int[chunkSize];
        IntBuffer buf = IntBuffer.wrap(last);
        packer.decompress(src, new IntBufferOutputStream(buf),
                filter, 1);
        dst.write(last, 0, chunkRemain);
    }
}
 

public int[] getPixelsARGB_8888(final GLState pGLState, final int pX, final int pY, final int pWidth, final int pHeight) {
	final int[] pixelsRGBA_8888 = new int[pWidth * pHeight];
	final IntBuffer glPixelBuffer = IntBuffer.wrap(pixelsRGBA_8888);
	glPixelBuffer.position(0);

	this.begin(pGLState);
	GLES20.glReadPixels(pX, pY, pWidth, pHeight, this.mPixelFormat.getGLFormat(), this.mPixelFormat.getGLType(), glPixelBuffer);
	this.end(pGLState);

	return GLHelper.convertRGBA_8888toARGB_8888(pixelsRGBA_8888);
}
 

/**
 * Return an IntBuffer that accesses the major version number.
 * This is used to create a Monitor object for this value.
 *
 * @return IntBuffer - a ByteBuffer that accesses the major version number
 *                     in the instrumentation buffer header.
 */
public IntBuffer majorVersionBuffer() {
    int[] holder = new int[1];
    holder[0] = getMajorVersion();
    IntBuffer ib = IntBuffer.wrap(holder);
    ib.limit(1);
    return ib;
  }
 

/**
 * Return an IntBuffer that accesses the minor version number.
 * This is used to create a Monitor object for this value.
 *
 * @return IntBuffer - a ByteBuffer that accesses the minor version number
 *                     in the instrumentation buffer header.
 */
public IntBuffer minorVersionBuffer() {
    int[] holder = new int[1];
    holder[0] = getMinorVersion();
    IntBuffer ib = IntBuffer.wrap(holder);
    ib.limit(1);
    return ib;
}
 

/**
 * Return an IntBuffer that accesses the minor version number.
 * This is used to create a Monitor object for this value.
 *
 * @return IntBuffer - a ByteBuffer that accesses the minor version number
 *                     in the instrumentation buffer header.
 */
public IntBuffer minorVersionBuffer() {
    int[] holder = new int[1];
    holder[0] = getMinorVersion();
    IntBuffer ib = IntBuffer.wrap(holder);
    ib.limit(1);
    return ib;
}
 

@Override
public void accept(ImageBuffer buffer) {
	final int imagewidth = buffer.bitmap.getWidth(),
			  imageheight = buffer.bitmap.getHeight(),
			  imagesize = imagewidth * imageheight + imagewidth * 4;
	
	// Change the buffer dimensions
	if (buffer.image == null || buffer.image.array().length < imagesize) {
		buffer.image = IntBuffer.wrap(new int[imagesize]);
	}
	
	buffer.imagewidth = imagewidth;
	buffer.imageheight = imageheight;
	buffer.bitmap.copyPixelsToBuffer(buffer.image);
}
 

/**
 * Return an IntBuffer that accesses the major version number. This is used to create a Monitor object for this value.
 *
 * @return IntBuffer - a ByteBuffer that accesses the major version number in the instrumentation buffer header.
 */
public IntBuffer majorVersionBuffer() {
	int[] holder = new int[1];
	holder[0] = getMajorVersion();
	IntBuffer ib = IntBuffer.wrap(holder);
	ib.limit(1);
	return ib;
}
 

/**
 * Return an IntBuffer that accesses the minor version number.
 * This is used to create a Monitor object for this value.
 *
 * @return IntBuffer - a ByteBuffer that accesses the minor version number
 *                     in the instrumentation buffer header.
 */
public IntBuffer minorVersionBuffer() {
    int[] holder = new int[1];
    holder[0] = getMinorVersion();
    IntBuffer ib = IntBuffer.wrap(holder);
    ib.limit(1);
    return ib;
}
 

@Test
public void methodOfNioBufferWithCovariantTypes_afterDesugarInvocationOfIntBufferMethod(
    @RuntimeMethodHandle(className = "NioBufferInvocations", memberName = "getIntBufferPosition")
        MethodHandle after)
    throws Throwable {
  IntBuffer buffer = IntBuffer.wrap(new int[] {10, 20, 30});
  int expectedPos = 2;

  IntBuffer result = (IntBuffer) after.invoke(buffer, expectedPos);
  assertThat(result.position()).isEqualTo(expectedPos);
}
 

/**
 * Return an IntBuffer that accesses the major version number.
 * This is used to create a Monitor object for this value.
 *
 * @return IntBuffer - a ByteBuffer that accesses the major version number
 *                     in the instrumentation buffer header.
 */
public IntBuffer majorVersionBuffer() {
    int[] holder = new int[1];
    holder[0] = getMajorVersion();
    IntBuffer ib = IntBuffer.wrap(holder);
    ib.limit(1);
    return ib;
  }
 

/**
 * Return an IntBuffer that accesses the minor version number.
 * This is used to create a Monitor object for this value.
 *
 * @return IntBuffer - a ByteBuffer that accesses the minor version number
 *                     in the instrumentation buffer header.
 */
public IntBuffer minorVersionBuffer() {
    int[] holder = new int[1];
    holder[0] = getMinorVersion();
    IntBuffer ib = IntBuffer.wrap(holder);
    ib.limit(1);
    return ib;
}
 

CursorImageData(BufferedImage[] bi, int delay, int hsX, int hsY, int curType) {
    // cursor type
    // 0 - Undefined (an array of images inside an ICO)
    // 1 - ICO
    // 2 - CUR
    IntBuffer singleCursor = null;
    ArrayList<IntBuffer> cursors = new ArrayList<IntBuffer>();
    int bwidth = 0;
    int bheight = 0;
    boolean multIcons = false;

    // make the cursor image
    for (int i = 0; i < bi.length; i++) {
        BufferedImage img = bi[i];
        bwidth = img.getWidth();
        bheight = img.getHeight();
        if (curType == 1) {
            hsX = 0;
            hsY = bheight - 1;
        } else if (curType == 2) {
            if (hsY == 0) {
                // make sure we flip if 0
                hsY = bheight - 1;
            }
        } else {
            // We force to choose 32x32 icon from
            // the array of icons in that ICO file.
            if (bwidth != 32 && bheight != 32) {
                multIcons = true;
                continue;
            } else {
                if (img.getType() != 2) {
                    continue;
                } else {
                    // force hotspot
                    hsY = bheight - 1;
                }
            }
        }

        // We flip our image because .ICO and .CUR will always be reversed.
        AffineTransform trans = AffineTransform.getScaleInstance(1, -1);
        trans.translate(0, -img.getHeight(null));
        AffineTransformOp op = new AffineTransformOp(trans, AffineTransformOp.TYPE_BILINEAR);
        img = op.filter(img, null);

        singleCursor = BufferUtils.createIntBuffer(img.getWidth() * img.getHeight());
        DataBufferInt dataIntBuf = (DataBufferInt) img.getData().getDataBuffer();
        singleCursor = IntBuffer.wrap(dataIntBuf.getData());
        cursors.add(singleCursor);
    }

    int count;
    if (multIcons) {
        bwidth = 32;
        bheight = 32;
        count = 1;
    } else {
        count = cursors.size();
    }
    // put the image in the IntBuffer
    data = BufferUtils.createIntBuffer(bwidth * bheight);
    imgDelay = BufferUtils.createIntBuffer(bi.length);
    for (int i = 0; i < count; i++) {
        data.put(cursors.get(i));
        if (delay > 0) {
            imgDelay.put(delay);
        }
    }
    width = bwidth;
    height = bheight;
    xHotSpot = hsX;
    yHotSpot = hsY;
    numImages = count;
    data.rewind();
    if (imgDelay != null) {
        imgDelay.rewind();
    }
}
 

@Override
	public void drawFrame() {
		if(frameBuffer == null) {
			if(getWidth() != 0 && getHeight() != 0) {
				initFBO();
			} else {
				return;
			}
		}

		GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, frameBuffer[0]);
		
		super.drawFrame();
		
		int[] pixels = new int[getWidth()*getHeight()];
		IntBuffer intBuffer = IntBuffer.wrap(pixels);
		intBuffer.position(0);
		GLES20.glReadPixels(0, 0, getWidth(), getHeight(), GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, intBuffer);

		GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, 0);
		
		for(int i = 0; i < pixels.length; i++) {
			pixels[i] = (pixels[i] & (0xFF00FF00)) | ((pixels[i] >> 16) & 0x000000FF) | ((pixels[i] << 16) & 0x00FF0000); //swap red and blue to translate back to bitmap rgb style
		}
		
		Bitmap image = Bitmap.createBitmap(pixels, getWidth(), getHeight(), Bitmap.Config.ARGB_8888);
		callback.bitmapCreated(image);
	}