Disabled external gits
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///////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2004, Industrial Light & Magic, a division of Lucas
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// Digital Ltd. LLC
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Industrial Light & Magic nor the names of
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// its contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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///////////////////////////////////////////////////////////////////////////
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//-----------------------------------------------------------------------------
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//
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// Code examples that show how to add preview images
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// (also known as thumbnais) to OpenEXR image files.
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//
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//-----------------------------------------------------------------------------
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#include <ImfRgbaFile.h>
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#include <ImfArray.h>
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#include <ImfPreviewImage.h>
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#include "ImathFun.h"
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#include "drawImage.h"
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#include <iostream>
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#include <algorithm>
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#include "namespaceAlias.h"
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using namespace IMF;
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using namespace std;
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using namespace IMATH_NAMESPACE;
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unsigned char
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gamma (float x)
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{
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//
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// Convert a floating-point pixel value to an 8-bit gamma-2.2
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// preview pixel. (This routine is a simplified version of
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// how the exrdisplay program transforms floating-point pixel
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// values in order to display them on the screen.)
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//
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x = pow (5.5555f * max (0.f, x), 0.4545f) * 84.66f;
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return (unsigned char) clamp (x, 0.f, 255.f);
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}
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void
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makePreviewImage (const Array2D <Rgba> &pixels,
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int width,
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int height,
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Array2D <PreviewRgba> &previewPixels,
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int &previewWidth,
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int &previewHeight)
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{
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const int N = 8;
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previewWidth = width / N;
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previewHeight = height / N;
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previewPixels.resizeErase (previewHeight, previewWidth);
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for (int y = 0; y < previewHeight; ++y)
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{
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for (int x = 0; x < previewWidth; ++x)
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{
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const Rgba &inPixel = pixels[y * N][x * N];
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PreviewRgba &outPixel = previewPixels[y][x];
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outPixel.r = gamma (inPixel.r);
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outPixel.g = gamma (inPixel.g);
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outPixel.b = gamma (inPixel.b);
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outPixel.a = int (clamp (inPixel.a * 255.f, 0.f, 255.f) + 0.5f);
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}
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}
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}
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void
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writeRgbaWithPreview1 (const char fileName[],
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const Array2D <Rgba> &pixels,
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int width,
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int height)
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{
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//
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// Write an image file with a preview image, version 1:
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//
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// - generate the preview image by subsampling the main image
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// - generate a file header
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// - add the preview image to the file header
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// - open the file (this stores the header with the
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// preview image in the file)
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// - describe the memory layout of the main image's pixels
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// - store the main image's pixels in the file
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//
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Array2D <PreviewRgba> previewPixels;
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int previewWidth;
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int previewHeight;
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makePreviewImage (pixels, width, height,
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previewPixels, previewWidth, previewHeight);
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Header header (width, height);
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header.setPreviewImage
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(PreviewImage (previewWidth, previewHeight, &previewPixels[0][0]));
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RgbaOutputFile file (fileName, header, WRITE_RGBA);
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file.setFrameBuffer (&pixels[0][0], 1, width);
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file.writePixels (height);
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}
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void
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writeRgbaWithPreview2 (const char fileName[],
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int width,
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int height)
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{
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//
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// Write an image file with a preview image, version 2:
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//
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// - generate a file header
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// - add a dummy preview image to the file header
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// - open the file (this stores the header with the dummy
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// preview image in the file)
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// - render the main image's pixels one scan line at a time,
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// and store each scan line in the file before rendering
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// the next scan line
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// - generate the preview image on the fly, while the main
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// image is being rendered
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// - once the main image has been rendered, store the preview
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// image in the file, overwriting the dummy preview
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//
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Array <Rgba> pixels (width);
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const int N = 8;
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int previewWidth = width / N;
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int previewHeight = height / N;
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Array2D <PreviewRgba> previewPixels (previewHeight, previewWidth);
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Header header (width, height);
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header.setPreviewImage (PreviewImage (previewWidth, previewHeight));
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RgbaOutputFile file (fileName, header, WRITE_RGBA);
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file.setFrameBuffer (pixels, 1, 0);
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for (int y = 0; y < height; ++y)
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{
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drawImage7 (pixels, width, height, y);
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file.writePixels (1);
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if (y % N == 0)
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{
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for (int x = 0; x < width; x += N)
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{
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const Rgba &inPixel = pixels[x];
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PreviewRgba &outPixel = previewPixels[y / N][x / N];
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outPixel.r = gamma (inPixel.r);
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outPixel.g = gamma (inPixel.g);
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outPixel.b = gamma (inPixel.b);
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outPixel.a = int (clamp (inPixel.a * 255.f, 0.f, 255.f) + 0.5f);
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}
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}
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}
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file.updatePreviewImage (&previewPixels[0][0]);
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}
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void
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previewImageExamples ()
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{
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cout << "\nfiles with preview images\n" << endl;
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cout << "drawing image then writing file" << endl;
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int w = 800;
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int h = 600;
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Array2D<Rgba> p (h, w);
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drawImage1 (p, w, h);
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writeRgbaWithPreview1 ("rgbaWithPreview1.exr", p, w, h);
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cout << "drawing image while writing file" << endl;
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writeRgbaWithPreview2 ("rgbaWithPreview2.exr", w, h);
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cout << endl;
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}
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