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cs440-acg/ext/openexr/OpenEXR_Viewers/exrdisplay/scaleImage.h

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+///////////////////////////////////////////////////////////////////////////
+//
+// Copyright (c) 2004, 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_SCALE_IMAGE_H
+#define INCLUDED_SCALE_IMAGE_H
+
+//----------------------------------------------------------------------------
+//
+//	Image scaling and filtering functions.
+//
+//----------------------------------------------------------------------------
+#include "namespaceAlias.h"
+
+#include <ImfRgba.h>
+#include <ImfArray.h>
+
+
+
+//
+// Scale an image horizontally or vertically, by a factor of
+// approximately f (f is adjusted slightly so that the corners
+// of the display window and the data window fall on integer
+// pixel locations).
+//
+// f		scale factor; must be >= 1.0
+//
+// w, h		width and height of the display window
+//
+// dw, dh	width and height of the data window
+//
+// dx, dy	offset of the data window's upper left
+// 		corner from the display window's upper
+// 		left corner
+//
+// pixels	the image's pixel array
+//
+
+void	scaleX (float f,
+		int &w, int &h,
+		int &dw, int &dh,
+		int &dx, int &dy,
+		IMF::Array<IMF::Rgba> &pixels);
+
+void	scaleY (float f, 
+		int &w, int &h, 
+		int &dw, int &dh,
+		int &dx, int &dy,
+		IMF::Array<IMF::Rgba> &pixels);
+
+//
+// Normalize the pixel values in an image so that the smallest
+// value becomes 0.0 and the largest value becomes 1.0.
+//
+
+void	normalizePixels (int dw, int dh, IMF::Array<IMF::Rgba> &pixels);
+
+
+//
+// Swap the left and right half of and image; then swap the
+// top and bottom half, so that the four corners of the image
+// end up in the center.
+//
+
+void	swapPixels (int dw, int dh, IMF::Array<IMF::Rgba> &pixels);
+
+
+#endif