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cs440-acg/ext/openexr/OpenEXR_Viewers/playexr/ImageBuffers.h

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+///////////////////////////////////////////////////////////////////////////
+//
+// Copyright (c) 2006, Industrial Light & Magic, a division of Lucas
+// Digital Ltd. LLC
+// 
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+// *       Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// *       Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// *       Neither the name of Industrial Light & Magic nor the names of
+// its contributors may be used to endorse or promote products derived
+// from this software without specific prior written permission. 
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+///////////////////////////////////////////////////////////////////////////
+
+#ifndef INCLUDED_IMAGE_BUFFERS_H
+#define INCLUDED_IMAGE_BUFFERS_H
+
+//-----------------------------------------------------------------------------
+//
+//	class ImageBuffers
+//
+//	This class implements a ring buffer for a fixed number frames
+//	of an image sequence.  The playExr program uses this ring buffer
+//	to transport images from the file reading thread to the display
+//	thread.  For each frame, the ImageBuffer contains:
+//
+//	* buffers for the pixels in the frame's thee channels,
+//	  either R, G, B or Y, RY, BY
+//
+//	* An Imf::FrameBuffer object that describes the layout of
+//	  the pixel buffers.  This is used by the file reading thread.
+//
+//	The ImageBuffer also stores the data window of the frames in
+//	the image sequence, and a flag that indicates if the frames
+//	contain RGB or luminance/chroma (Y, RY, BY) data.
+//
+//	Two semaphores indicate which frames in the ring buffer are
+//	empty and how many are full.  The file reading thread fills
+//	frames and the display thread empties them.
+//
+//	The file reading thread executes a loop that looks like this:
+//
+//		int i = 0;
+//
+//		while (true)
+//		{
+//		    emptyBuffersSemaphore.wait();
+//		    read next frame from a file, store it in buffer i;
+//		    fullBuffersSemaphore.post();
+//		    i = (i + 1) % numBuffers();
+//		}
+//
+//	The corresponding loop in the display thread looks like this:
+//
+//		int i = 0;
+//
+//		while (true)
+//		{
+//		    fullBuffersSemaphore.wait();
+//		    display the image in buffer i;
+//		    emptyBuffersSemaphore.post();
+//		    i = (i + 1) % numBuffers();
+//		}
+//
+//-----------------------------------------------------------------------------
+
+#include <ImfFrameBuffer.h>
+#include <ImathBox.h>
+#include <IlmThreadSemaphore.h>
+
+
+class ImageBuffers
+{
+  public:
+
+    ImageBuffers ();
+
+    //----------------------------------------------------------
+    // Flag that indicates if we are playing forward or backward
+    //----------------------------------------------------------
+
+    bool 			forward;
+
+    //-----------------------------------------------------------------------
+    // Flag that indicates if the frames contain RGB or luminance/chroma data
+    //-----------------------------------------------------------------------
+
+    bool 			rgbMode;
+
+    //------------------------------------
+    // Number of frames in the ring buffer
+    //------------------------------------
+
+    int				numBuffers ();
+
+    //------------------------------------------------
+    // Access to the Imf::FrameBuffers
+    // i must be in the range from 0 to numBuffers()-1
+    //------------------------------------------------
+
+    OPENEXR_IMF_NAMESPACE::FrameBuffer & frameBuffer (int i);
+
+
+    //------------------------------------------------
+    // Access to the pixel buffers
+    // i must be in the range from 0 to numBuffers()-1
+    // channel must be in the range from 0 to 2
+    //------------------------------------------------
+
+    char * &			pixels (int i, int channel);
+
+
+    //-----------------------------------------------------------
+    // Access to frame numbers that correspond the pixel buffers.
+    // i must be in the range from 0 to numBuffers()-1
+    //-----------------------------------------------------------
+
+    int &			frameNumber (int i);
+
+
+    //---------------------------
+    // Data window for all frames
+    //---------------------------
+
+    IMATH_NAMESPACE::Box2i		dataWindow;
+
+
+    //-----------
+    // Semaphores
+    //-----------
+
+    ILMTHREAD_NAMESPACE::Semaphore	emptyBuffersSemaphore;
+    ILMTHREAD_NAMESPACE::Semaphore	fullBuffersSemaphore;
+    ILMTHREAD_NAMESPACE::Semaphore	exitSemaphore1;
+    ILMTHREAD_NAMESPACE::Semaphore	exitSemaphore2;
+	 
+  private:
+
+    static const int NUM_BUFFERS = 3;
+
+    OPENEXR_IMF_NAMESPACE::FrameBuffer	_frameBuffers[NUM_BUFFERS];
+    char *			_pixels[NUM_BUFFERS][3];
+    int				_frameNumbers[NUM_BUFFERS];
+};
+
+
+#endif