/*! load an EXR file from disk */
Ref<Image> loadExr(const FileName& filename)
{
Imf::RgbaInputFile file (filename.c_str());
Imath::Box2i dw = file.dataWindow();
ssize_t width = dw.max.x - dw.min.x + 1;
ssize_t height = dw.max.y - dw.min.y + 1;
Imf::Array2D<Imf::Rgba> pixels(height, width);
file.setFrameBuffer (&pixels[0][0] - dw.min.x - dw.min.y * width, 1, width);
file.readPixels (dw.min.y, dw.max.y);
Ref<Image> img = new Image3f(width,height,filename);
if (file.lineOrder() == Imf::INCREASING_Y) {
for (ssize_t y=0; y<height; y++) {
for (ssize_t x=0; x<width; x++) {
Imf::Rgba c = pixels[y][x];
img->set(x,y,Color4(c.r,c.g,c.b,c.a));
}
}
}
else {
for (ssize_t y=0; y<height; y++) {
for (ssize_t x=0; x<width; x++) {
Imf::Rgba c = pixels[y][x];
img->set(x,height-y-1,Color4(c.r,c.g,c.b,c.a));
}
}
}
return img;
}
////////////////////////////////////////////////////////////////////////////
// Take a file name/location and load an OpenEXR
// Load the image into the "texture" texture object and pass back the texture sizes
//
bool LoadOpenEXRImage(char *fileName, GLint textureName, GLuint &texWidth, GLuint &texHeight)
{
// The OpenEXR uses exception handling to report errors or failures
// Do all work in a try block to catch any thrown exceptions.
try
{
Imf::Array2D<Imf::Rgba> pixels;
Imf::RgbaInputFile file (fileName);
Imath::Box2i dw = file.dataWindow();
texWidth = dw.max.x - dw.min.x + 1;
texHeight = dw.max.y - dw.min.y + 1;
pixels.resizeErase (texHeight, texWidth);
file.setFrameBuffer (&pixels[0][0] - dw.min.x - dw.min.y * texWidth, 1, texWidth);
file.readPixels (dw.min.y, dw.max.y);
GLfloat* texels = (GLfloat*)malloc(texWidth * texHeight * 3 * sizeof(GLfloat));
GLfloat* pTex = texels;
// Copy OpenEXR into local buffer for loading into a texture
for (unsigned int v = 0; v < texHeight; v++)
{
for (unsigned int u = 0; u < texWidth; u++)
{
Imf::Rgba texel = pixels[texHeight - v - 1][u];
pTex[0] = texel.r;
pTex[1] = texel.g;
pTex[2] = texel.b;
pTex += 3;
}
}
// Bind texture, load image, set tex state
glBindTexture(GL_TEXTURE_2D, textureName);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB16F, texWidth, texHeight, 0, GL_RGB, GL_FLOAT, texels);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
free(texels);
}
catch(Iex::BaseExc & e)
{
std::cerr << e.what() << std::endl;
//
// Handle exception.
//
}
return true;
}
void make_preview(Imf::RgbaInputFile &in,
float exposure,
int previewWidth,
int previewHeight,
Imf::Array2D <Imf::PreviewRgba> &previewPixels)
{
//
// Read image
//
Box2i dw = in.dataWindow();
int w = dw.max.x - dw.min.x + 1;
int h = dw.max.y - dw.min.y + 1;
Array2D <Rgba> pixels (h, w);
in.setFrameBuffer (&pixels[0][0] - dw.min.y * w - dw.min.x, 1, w);
in.readPixels (dw.min.y, dw.max.y);
//
// Make a preview image
//
previewPixels.resizeErase (previewHeight, previewWidth);
float fx = (previewWidth > 0)? (float (w - 1) / (previewWidth - 1)): 1;
float fy = (previewHeight > 0)? (float (h - 1) / (previewHeight - 1)): 1;
float m = Math<float>::pow (2.f, clamp (exposure + 2.47393f, -20.f, 20.f));
for (int y = 0; y < previewHeight; ++y)
{
for (int x = 0; x < previewWidth; ++x)
{
PreviewRgba &preview = previewPixels[y][x];
const Rgba &pixel = pixels[int (y * fy + .5f)][int (x * fx + .5f)];
preview.r = gamma (pixel.r, m);
preview.g = gamma (pixel.g, m);
preview.b = gamma (pixel.b, m);
preview.a = int (clamp (pixel.a * 255.f, 0.f, 255.f) + .5f);
}
}
}
int
main (int argc, char * argv[])
{
int status = 0;
try
{
clo::parser parser;
parser.parse (argc, argv);
const clo::options & options = parser.get_options ();
const vector<string> & nonopts = parser.get_non_options ();
if (nonopts.size () != 4)
{
clo::option_error e ("illegal syntax.");
throw e;
}
const std::string & exrA = nonopts[0];
const std::string & op = nonopts[1];
const std::string & exrB = nonopts[2];
const std::string & exrC = nonopts[3];
if (op != "over" && op != "in" && op != "out")
{
clo::option_error e ("unknown operation");
throw e;
}
//
// Open A and B for reading.
//
// The images must have the same data and display window,
// but this requirement should be relaxed.
//
Imf::RgbaInputFile inA (exrA.c_str ());
Imf::RgbaInputFile inB (exrB.c_str ());
Imath::Box2i dataWinA = inA.dataWindow ();
Imath::Box2i dataWinB = inB.dataWindow ();
if ((dataWinA.min.x != dataWinB.min.x) ||
(dataWinA.min.y != dataWinB.min.y) ||
(dataWinA.max.x != dataWinB.max.x) ||
(dataWinA.max.y != dataWinB.max.y))
{
THROW (Iex::BaseExc, "both images must have the same data window");
}
Imath::Box2i dpyWinA = inA.displayWindow ();
Imath::Box2i dpyWinB = inB.displayWindow ();
if ((dpyWinA.min.x != dpyWinB.min.x) ||
(dpyWinA.min.y != dpyWinB.min.y) ||
(dpyWinA.max.x != dpyWinB.max.x) ||
(dpyWinA.max.y != dpyWinB.max.y))
{
THROW (Iex::BaseExc, "both images must have the same display "
<< "window");
}
//
// Open C for writing, preserving the data window and display
// window of the original images.
//
Imf::RgbaOutputFile outC (exrC.c_str (), dpyWinA, dataWinA,
Imf::WRITE_RGBA);
//
// Read A and B.
//
Imath::V2i dim (dataWinA.max.x - dataWinA.min.x + 1,
dataWinA.max.y - dataWinA.min.y + 1);
int dx = dataWinA.min.x;
int dy = dataWinA.min.y;
Imf::Array<Imf::Rgba> imgA (dim.x * dim.y);
Imf::Array<Imf::Rgba> imgB (dim.x * dim.y);
inA.setFrameBuffer (imgA - dx - dy * dim.x, 1, dim.x);
inA.readPixels (dataWinA.min.y, dataWinA.max.y);
inB.setFrameBuffer (imgB - dx - dy * dim.x, 1, dim.x);
inB.readPixels (dataWinB.min.y, dataWinB.max.y);
//
// Do the comp, overwrite image B with the result.
//
if (op == "over")
Comp::over (dim, imgA, imgB, imgB);
else if (op == "in")
Comp::in (dim, imgA, imgB, imgB);
else
Comp::out (dim, imgA, imgB, imgB);
//
// Write comp'ed image.
//
outC.setFrameBuffer (imgB - dx - dy * dim.x, 1, dim.x);
outC.writePixels (dim.y);
}
catch (clo::autoexcept & e)
{
switch (e.get_autothrow_id ())
{
case clo::autothrow_help:
cout << "Usage: exrcomp [options] <a.exr> <over|in|out> "
<< "<b.exr> <output.exr>" << endl;
cout << e.what ();
break;
case clo::autothrow_version:
cout << "exrcomp version 1.0" << endl;
break;
default:
cerr << "Internal error (illegal autothrow)" << endl;
cerr << e.what () << endl;
status = 1;
}
}
catch (clo::option_error & e)
{
cerr << "exrcomp: " << e.what () << endl;
cerr << "Use -h for help." << endl;
status = 1;
}
catch (exception & e)
{
cerr << "exrcomp: " << e.what () << endl;
status = 1;
}
catch (...)
{
cerr << "exrcomp: caught unhandled exception" << endl;
status = 1;
}
return status;
}
