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rgbaInterfaceExamples.cpp

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//
// Copyright (c) 2004, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
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//-----------------------------------------------------------------------------
//
//    Code examples that show how class RgbaInputFile and
//    class RgbaOutputFile can be used to read and write
//    OpenEXR image files with 16-bit floating-point red,
//    green, blue and alpha channels.
//
//-----------------------------------------------------------------------------


#include <ImfRgbaFile.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
writeRgba1 (const char fileName[],
          const Rgba *pixels,
          int width,
          int height)
{
    //
    // Write an RGBA image using class RgbaOutputFile.
    //
    //      - open the file
    //      - describe the memory layout of the pixels
    //      - store the pixels in the file
    //


    RgbaOutputFile file (fileName, width, height, WRITE_RGBA);
    file.setFrameBuffer (pixels, 1, width);
    file.writePixels (height);
}


void
writeRgba2 (const char fileName[],
          const Rgba *pixels,
          int width,
          int height,
          const Box2i &dataWindow)
{
    //
    // Write an RGBA image using class RgbaOutputFile.
    // Don't store the whole image in the file, but
    // crop it according to the given data window.
    //
    //      - open the file
    //      - describe the memory layout of the pixels
    //      - store the pixels in the file
    //

    Box2i displayWindow (V2i (0, 0), V2i (width - 1, height - 1));
    RgbaOutputFile file (fileName, displayWindow, dataWindow, WRITE_RGBA);
    file.setFrameBuffer (pixels, 1, width);
    file.writePixels (dataWindow.max.y - dataWindow.min.y + 1);
}


void
writeRgba3 (const char fileName[],
          const Rgba *pixels,
          int width,
          int height,
          const char comments[],
          const M44f &cameraTransform)
{
    //
    // Write an RGBA image using class RgbaOutputFile.
    // Store two extra attributes in the image header:
    // a string and a 4x4 transformation matrix.
    //
    //      - open the file
    //      - describe the memory layout of the pixels
    //      - store the pixels in the file
    //

    Header header (width, height);
    header.insert ("comments", StringAttribute (comments));
    header.insert ("cameraTransform", M44fAttribute (cameraTransform));

    RgbaOutputFile file (fileName, header, WRITE_RGBA);
    file.setFrameBuffer (pixels, 1, width);
    file.writePixels (height);
}


void
readRgba1 (const char fileName[],
         Array2D<Rgba> &pixels,
         int &width,
         int &height)
{
    //
    // Read an RGBA image using class RgbaInputFile:
    //
    //      - open the file
    //      - allocate memory for the pixels
    //      - describe the memory layout of the pixels
    //      - read the pixels from the file
    //

    RgbaInputFile file (fileName);
    Box2i dw = file.dataWindow();

    width  = dw.max.x - dw.min.x + 1;
    height = dw.max.y - dw.min.y + 1;
    pixels.resizeErase (height, width);

    file.setFrameBuffer (&pixels[0][0] - dw.min.x - dw.min.y * width, 1, width);
    file.readPixels (dw.min.y, dw.max.y);
}


void
readRgba2 (const char fileName[])
{
    //
    // Read an RGBA image using class RgbaInputFile.
    // Read the pixels, 10 scan lines at a time, and
    // store the pixel data in a buffer that is just
    // large enough to hold 10 scan lines worth of data.
    //
    //      - open the file
    //      - allocate memory for the pixels
    //      - for each block of 10 scan lines,
    //        describe the memory layout of the pixels,
    //        read the pixels from the file,
    //        process the pixels and discard them
    //

    RgbaInputFile file (fileName);
    Box2i dw = file.dataWindow();

    int width  = dw.max.x - dw.min.x + 1;
    int height = dw.max.y - dw.min.y + 1;
    Array2D<Rgba> pixels (10, width);

    while (dw.min.y <= dw.max.y)
    {
      file.setFrameBuffer (&pixels[0][0] - dw.min.x - dw.min.y * width,
                       1, width);

      file.readPixels (dw.min.y, min (dw.min.y + 9, dw.max.y));
      // processPixels (pixels)
      
      dw.min.y += 10;
    }
}


void
readHeader (const char fileName[])
{
    //
    // Read an image's header from a file, and if the header
    // contains comments and camera transformation attributes,
    // print the values of those attributes.
    //
    //      - open the file
    //      - get the file header
    //      - look for the attributes
    //

    RgbaInputFile file (fileName);

    const StringAttribute *comments =
      file.header().findTypedAttribute <StringAttribute> ("comments");

    const M44fAttribute *cameraTransform = 
      file.header().findTypedAttribute <M44fAttribute> ("cameraTransform");

    if (comments)
      cout << "comments\n   " << comments->value() << endl;

    if (cameraTransform)
      cout << "cameraTransform\n" << cameraTransform->value() << flush;
}


void
rgbaInterfaceExamples ()
{
    cout << "\nRGBA images\n" << endl;
    cout << "drawing image" << endl;

    int w = 800;
    int h = 600;

    Array2D<Rgba> p (h, w);
    drawImage1 (p, w, h);

    cout << "writing entire image" << endl;

    writeRgba1 ("rgba1.exr", &p[0][0], w, h);

    cout << "writing cropped image" << endl;

    writeRgba2 ("rgba2.exr", &p[0][0], w, h,
              Box2i (V2i (w/6, h/6), V2i (w/2, h/2)));

    cout << "writing image with extra header attributes" << endl;

    writeRgba3 ("rgba3.exr", &p[0][0], w, h,
              "may contain peanuts", M44f());

    cout << "reading rgba file" << endl;

    readRgba1 ("rgba2.exr", p, w, h);

    cout << "reading rgba file into 10-scanline buffer" << endl;

    readRgba2 ("rgba2.exr");

    cout << "reading extra file header attributes" << endl;

    readHeader ("rgba3.exr");
}

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