/usr/share/doc/libopenexr6/examples/generalInterfaceTiledExamples.cpp is in libopenexr-dev 1.6.1-4.1.
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//
// Copyright (c) 2002, 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.
//
///////////////////////////////////////////////////////////////////////////
//-----------------------------------------------------------------------------
//
// Code examples that show how class TiledInputFile and
// class TiledOutputFile can be used to read and write
// OpenEXR image files with an arbitrary set of channels.
//
//-----------------------------------------------------------------------------
#include <ImfTiledOutputFile.h>
#include <ImfTiledInputFile.h>
#include <ImfChannelList.h>
#include <ImfStringAttribute.h>
#include <ImfMatrixAttribute.h>
#include <ImfArray.h>
#include <drawImage.h>
#include <iostream>
using namespace std;
using namespace Imf;
using namespace Imath;
void
writeTiled1 (const char fileName[],
Array2D<GZ> &pixels,
int width, int height,
int tileWidth, int tileHeight)
{
Header header (width, height);
header.channels().insert ("G", Channel (HALF));
header.channels().insert ("Z", Channel (FLOAT));
header.setTileDescription
(TileDescription (tileWidth, tileHeight, ONE_LEVEL));
TiledOutputFile out (fileName, header);
FrameBuffer frameBuffer;
frameBuffer.insert ("G", // name
Slice (HALF, // type
(char *) &pixels[0][0].g, // base
sizeof (pixels[0][0]) * 1, // xStride
sizeof (pixels[0][0]) * width)); // yStride
frameBuffer.insert ("Z", // name
Slice (FLOAT, // type
(char *) &pixels[0][0].z, // base
sizeof (pixels[0][0]) * 1, // xStride
sizeof (pixels[0][0]) * width)); // yStride
out.setFrameBuffer (frameBuffer);
out.writeTiles (0, out.numXTiles() - 1, 0, out.numYTiles() - 1);
}
void
readTiled1 (const char fileName[],
Array2D<GZ> &pixels,
int &width, int &height)
{
TiledInputFile in (fileName);
Box2i dw = in.header().dataWindow();
width = dw.max.x - dw.min.x + 1;
height = dw.max.y - dw.min.y + 1;
int dx = dw.min.x;
int dy = dw.min.y;
pixels.resizeErase (height, width);
FrameBuffer frameBuffer;
frameBuffer.insert ("G", // name
Slice (HALF, // type
(char *) &pixels[-dy][-dx].g, // base
sizeof (pixels[0][0]) * 1, // xStride
sizeof (pixels[0][0]) * width)); // yStride
frameBuffer.insert ("Z", // name
Slice (FLOAT, // type
(char *) &pixels[-dy][-dx].z, // base
sizeof (pixels[0][0]) * 1, // xStride
sizeof (pixels[0][0]) * width)); // yStride
in.setFrameBuffer (frameBuffer);
in.readTiles (0, in.numXTiles() - 1, 0, in.numYTiles() - 1);
}
void
generalInterfaceTiledExamples ()
{
cout << "\nGZ (green, depth) tiled files\n" << endl;
cout << "drawing image" << endl;
int w = 800;
int h = 600;
Array2D<GZ> pixels (h, w);
drawImage6 (pixels, w, h);
cout << "writing file" << endl;
writeTiled1 ("tiledgz1.exr", pixels, w, h, 64, 64);
cout << "reading file" << endl;
readTiled1 ("tiledgz1.exr", pixels, w, h);
}
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