/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%                            EEEEE  X   X  RRRR                               %
%                            E       X X   R   R                              %
%                            EEE      X    RRRR                               %
%                            E       X X   R R                                %
%                            EEEEE  X   X  R  R                               %
%                                                                             %
%                                                                             %
%            Read/Write High Dynamic-Range (HDR) Image File Format            %
%                                                                             %
%                              Software Design                                %
%                                   Cristy                                    %
%                                 April 2007                                  %
%                                                                             %
%                                                                             %
%  Copyright 1999-2017 ImageMagick Studio LLC, a non-profit organization      %
%  dedicated to making software imaging solutions freely available.           %
%                                                                             %
%  You may not use this file except in compliance with the License.  You may  %
%  obtain a copy of the License at                                            %
%                                                                             %
%    http://www.imagemagick.org/script/license.php                            %
%                                                                             %
%  Unless required by applicable law or agreed to in writing, software        %
%  distributed under the License is distributed on an "AS IS" BASIS,          %
%  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
%  See the License for the specific language governing permissions and        %
%  limitations under the License.                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
*/

/*
  Include declarations.
*/
#include "magick/studio.h"
#include "magick/blob.h"
#include "magick/blob-private.h"
#include "magick/cache.h"
#include "magick/exception.h"
#include "magick/exception-private.h"
#include "magick/image.h"
#include "magick/image-private.h"
#include "magick/list.h"
#include "magick/magick.h"
#include "magick/memory_.h"
#include "magick/option.h"
#include "magick/pixel-accessor.h"
#include "magick/property.h"
#include "magick/quantum-private.h"
#include "magick/static.h"
#include "magick/string_.h"
#include "magick/module.h"
#include "magick/resource_.h"
#include "magick/utility.h"
#if defined(MAGICKCORE_OPENEXR_DELEGATE)
#include <ImfCRgbaFile.h>

/*
  Typedef declaractions.
*/
typedef struct _ExrWindow
{
  int
    max_x,
    max_y,
    min_x,
    min_y;
} ExrWindow;

/*
  Forward declarations.
*/
static MagickBooleanType
  WriteEXRImage(const ImageInfo *,Image *);
#endif

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   I s E X R                                                                 %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  IsEXR() returns MagickTrue if the image format type, identified by the
%  magick string, is EXR.
%
%  The format of the IsEXR method is:
%
%      MagickBooleanType IsEXR(const unsigned char *magick,const size_t length)
%
%  A description of each parameter follows:
%
%    o magick: compare image format pattern against these bytes.
%
%    o length: Specifies the length of the magick string.
%
*/
static MagickBooleanType IsEXR(const unsigned char *magick,const size_t length)
{
  if (length < 4)
    return(MagickFalse);
  if (memcmp(magick,"\166\057\061\001",4) == 0)
    return(MagickTrue);
  return(MagickFalse);
}

#if defined(MAGICKCORE_OPENEXR_DELEGATE)
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   R e a d E X R I m a g e                                                   %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  ReadEXRImage reads an image in the high dynamic-range (HDR) file format
%  developed by Industrial Light & Magic.  It allocates the memory necessary
%  for the new Image structure and returns a pointer to the new image.
%
%  The format of the ReadEXRImage method is:
%
%      Image *ReadEXRImage(const ImageInfo *image_info,ExceptionInfo *exception)
%
%  A description of each parameter follows:
%
%    o image_info: the image info.
%
%    o exception: return any errors or warnings in this structure.
%
*/
static Image *ReadEXRImage(const ImageInfo *image_info,ExceptionInfo *exception)
{
  ExrWindow
    data_window,
    display_window;

  const ImfHeader
    *hdr_info;

  Image
    *image;

  ImageInfo
    *read_info;

  ImfInputFile
    *file;

  ImfRgba
    *scanline;

  MagickBooleanType
    status;

  register ssize_t
    x;

  register PixelPacket
    *q;

  ssize_t
    columns,
    y;

  /*
    Open image.
  */
  assert(image_info != (const ImageInfo *) NULL);
  assert(image_info->signature == MagickSignature);
  if (image_info->debug != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
      image_info->filename);
  assert(exception != (ExceptionInfo *) NULL);
  assert(exception->signature == MagickSignature);
  image=AcquireImage(image_info);
  status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
  if (status == MagickFalse)
    {
      image=DestroyImageList(image);
      return((Image *) NULL);
    }
  read_info=CloneImageInfo(image_info);
  if (IsPathAccessible(read_info->filename) == MagickFalse)
    {
      (void) AcquireUniqueFilename(read_info->filename);
      (void) ImageToFile(image,read_info->filename,exception);
    }
  file=ImfOpenInputFile(read_info->filename);
  if (file == (ImfInputFile *) NULL)
    {
      ThrowFileException(exception,BlobError,"UnableToOpenBlob",
        ImfErrorMessage());
      if (LocaleCompare(image_info->filename,read_info->filename) != 0)
        (void) RelinquishUniqueFileResource(read_info->filename);
      read_info=DestroyImageInfo(read_info);
      return((Image *) NULL);
    }
  hdr_info=ImfInputHeader(file);
  ImfHeaderDisplayWindow(hdr_info,&display_window.min_x,&display_window.min_y,
    &display_window.max_x,&display_window.max_y);
  image->columns=display_window.max_x-display_window.min_x+1UL;
  image->rows=display_window.max_y-display_window.min_y+1UL;
  image->matte=MagickTrue;
  SetImageColorspace(image,RGBColorspace);
  image->gamma=1.0;
  if (image_info->ping != MagickFalse)
    {
      (void) ImfCloseInputFile(file);
      if (LocaleCompare(image_info->filename,read_info->filename) != 0)
        (void) RelinquishUniqueFileResource(read_info->filename);
      read_info=DestroyImageInfo(read_info);
      (void) CloseBlob(image);
      return(GetFirstImageInList(image));
    }
  status=SetImageExtent(image,image->columns,image->rows);
  if (status == MagickFalse)
    {
      InheritException(exception,&image->exception);
      return(DestroyImageList(image));
    }
  ImfHeaderDataWindow(hdr_info,&data_window.min_x,&data_window.min_y,
    &data_window.max_x,&data_window.max_y);
  columns=(ssize_t) data_window.max_x-data_window.min_x+1UL;
  if ((display_window.min_x > data_window.max_x) ||
      (display_window.min_x+(int) image->columns <= data_window.min_x))
    scanline=(ImfRgba *) NULL;
  else
    {
      scanline=(ImfRgba *) AcquireQuantumMemory(columns,sizeof(*scanline));
      if (scanline == (ImfRgba *) NULL)
        {
          (void) ImfCloseInputFile(file);
          if (LocaleCompare(image_info->filename,read_info->filename) != 0)
            (void) RelinquishUniqueFileResource(read_info->filename);
          read_info=DestroyImageInfo(read_info);
          ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
        }
    }
  for (y=0; y < (ssize_t) image->rows; y++)
  {
    int
      yy;

    q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
    if (q == (PixelPacket *) NULL)
      break;
    yy=display_window.min_y+y;
    if ((yy < data_window.min_y) || (yy > data_window.max_y) ||
        (scanline == (ImfRgba *) NULL))
    {
      for (x=0; x < (ssize_t) image->columns; x++)
      {
        SetPixelRed(q,image->background_color.red);
        SetPixelGreen(q,image->background_color.green);
        SetPixelBlue(q,image->background_color.blue);
        SetPixelOpacity(q,image->background_color.opacity);
        q++;
      }
      continue;
    }
    ResetMagickMemory(scanline,0,columns*sizeof(*scanline));
    ImfInputSetFrameBuffer(file,scanline-data_window.min_x-columns*yy,1,
      columns);
    ImfInputReadPixels(file,yy,yy);
    for (x=0; x < (ssize_t) image->columns; x++)
    {
      int
        xx;

      xx=display_window.min_x+((int) x-data_window.min_x);
      if ((xx < 0) || (display_window.min_x+(int) x > data_window.max_x))
        {
          SetPixelRed(q,image->background_color.red);
          SetPixelGreen(q,image->background_color.green);
          SetPixelBlue(q,image->background_color.blue);
          SetPixelOpacity(q,image->background_color.opacity);
        }
      else
        {
          SetPixelRed(q,ClampToQuantum((MagickRealType) QuantumRange*
            ImfHalfToFloat(scanline[xx].r)));
          SetPixelGreen(q,ClampToQuantum((MagickRealType) QuantumRange*
            ImfHalfToFloat(scanline[xx].g)));
          SetPixelBlue(q,ClampToQuantum((MagickRealType) QuantumRange*
            ImfHalfToFloat(scanline[xx].b)));
          SetPixelAlpha(q,ClampToQuantum((MagickRealType) QuantumRange*
            ImfHalfToFloat(scanline[xx].a)));
        }
      q++;
    }
    if (SyncAuthenticPixels(image,exception) == MagickFalse)
      break;
  }
  scanline=(ImfRgba *) RelinquishMagickMemory(scanline);
  (void) ImfCloseInputFile(file);
  if (LocaleCompare(image_info->filename,read_info->filename) != 0)
    (void) RelinquishUniqueFileResource(read_info->filename);
  read_info=DestroyImageInfo(read_info);
  (void) CloseBlob(image);
  return(GetFirstImageInList(image));
}
#endif

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   R e g i s t e r E X R I m a g e                                           %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  RegisterEXRImage() adds properties for the EXR image format
%  to the list of supported formats.  The properties include the image format
%  tag, a method to read and/or write the format, whether the format
%  supports the saving of more than one frame to the same file or blob,
%  whether the format supports native in-memory I/O, and a brief
%  description of the format.
%
%  The format of the RegisterEXRImage method is:
%
%      size_t RegisterEXRImage(void)
%
*/
ModuleExport size_t RegisterEXRImage(void)
{
  MagickInfo
    *entry;

  entry=SetMagickInfo("EXR");
#if defined(MAGICKCORE_OPENEXR_DELEGATE)
  entry->decoder=(DecodeImageHandler *) ReadEXRImage;
  entry->encoder=(EncodeImageHandler *) WriteEXRImage;
#endif
  entry->magick=(IsImageFormatHandler *) IsEXR;
  entry->adjoin=MagickFalse;
  entry->description=ConstantString("High Dynamic-range (HDR)");
  entry->blob_support=MagickFalse;
  entry->module=ConstantString("EXR");
  (void) RegisterMagickInfo(entry);
  return(MagickImageCoderSignature);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   U n r e g i s t e r E X R I m a g e                                       %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  UnregisterEXRImage() removes format registrations made by the
%  EXR module from the list of supported formats.
%
%  The format of the UnregisterEXRImage method is:
%
%      UnregisterEXRImage(void)
%
*/
ModuleExport void UnregisterEXRImage(void)
{
  (void) UnregisterMagickInfo("EXR");
}

#if defined(MAGICKCORE_OPENEXR_DELEGATE)
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   W r i t e E X R I m a g e                                                 %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  WriteEXRImage() writes an image to a file the in the high dynamic-range
%  (HDR) file format developed by Industrial Light & Magic.
%
%  The format of the WriteEXRImage method is:
%
%      MagickBooleanType WriteEXRImage(const ImageInfo *image_info,Image *image)
%
%  A description of each parameter follows.
%
%    o image_info: the image info.
%
%    o image:  The image.
%
*/
static MagickBooleanType WriteEXRImage(const ImageInfo *image_info,Image *image)
{
  const char
    *sampling_factor,
    *value;

  ImageInfo
    *write_info;

  ImfHalf
    half_quantum;

  ImfHeader
    *hdr_info;

  ImfOutputFile
    *file;

  ImfRgba
    *scanline;

  int
    channels,
    compression,
    factors[3];

  MagickBooleanType
    status;

  register const PixelPacket
    *p;

  register ssize_t
    x;

  ssize_t
    y;

  /*
    Open output image file.
  */
  assert(image_info != (const ImageInfo *) NULL);
  assert(image_info->signature == MagickSignature);
  assert(image != (Image *) NULL);
  assert(image->signature == MagickSignature);
  if (image->debug != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
  status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
  if (status == MagickFalse)
    return(status);
  (void) SetImageColorspace(image,RGBColorspace);
  write_info=CloneImageInfo(image_info);
  (void) AcquireUniqueFilename(write_info->filename);
  hdr_info=ImfNewHeader();
  ImfHeaderSetDataWindow(hdr_info,0,0,(int) image->columns-1,(int)
    image->rows-1);
  ImfHeaderSetDisplayWindow(hdr_info,0,0,(int) image->columns-1,(int)
    image->rows-1);
  compression=IMF_NO_COMPRESSION;
  if (write_info->compression == ZipSCompression)
    compression=IMF_ZIPS_COMPRESSION;
  if (write_info->compression == ZipCompression)
    compression=IMF_ZIP_COMPRESSION;
  if (write_info->compression == PizCompression)
    compression=IMF_PIZ_COMPRESSION;
  if (write_info->compression == Pxr24Compression)
    compression=IMF_PXR24_COMPRESSION;
#if defined(B44Compression)
  if (write_info->compression == B44Compression)
    compression=IMF_B44_COMPRESSION;
#endif
#if defined(B44ACompression)
  if (write_info->compression == B44ACompression)
    compression=IMF_B44A_COMPRESSION;
#endif
  channels=0;
  value=GetImageOption(image_info,"exr:color-type");
  if (value != (const char *) NULL)
    {
      if (LocaleCompare(value,"RGB") == 0)
        channels=IMF_WRITE_RGB;
      else if (LocaleCompare(value,"RGBA") == 0)
        channels=IMF_WRITE_RGBA;
      else if (LocaleCompare(value,"YC") == 0)
        channels=IMF_WRITE_YC;
      else if (LocaleCompare(value,"YCA") == 0)
        channels=IMF_WRITE_YCA;
      else if (LocaleCompare(value,"Y") == 0)
        channels=IMF_WRITE_Y;
      else if (LocaleCompare(value,"YA") == 0)
        channels=IMF_WRITE_YA;
      else if (LocaleCompare(value,"R") == 0)
        channels=IMF_WRITE_R;
      else if (LocaleCompare(value,"G") == 0)
        channels=IMF_WRITE_G;
      else if (LocaleCompare(value,"B") == 0)
        channels=IMF_WRITE_B;
      else if (LocaleCompare(value,"A") == 0)
        channels=IMF_WRITE_A;
      else
        (void) ThrowMagickException(&image->exception,GetMagickModule(),
          CoderWarning,"ignoring invalid defined exr:color-type","=%s",value);
   }
  sampling_factor=(const char *) NULL;
  factors[0]=0;
  if (image_info->sampling_factor != (char *) NULL)
    sampling_factor=image_info->sampling_factor;
  if (sampling_factor != NULL)
    {
      /*
        Sampling factors, valid values are 1x1 or 2x2.
      */
      if (sscanf(sampling_factor,"%d:%d:%d",factors,factors+1,factors+2) == 3)
        {
          if ((factors[0] == factors[1]) && (factors[1] == factors[2]))
            factors[0]=1;
          else
            if ((factors[0] == (2*factors[1])) && (factors[2] == 0))
              factors[0]=2;
        }
      else
        if (sscanf(sampling_factor,"%dx%d",factors,factors+1) == 2)
          {
            if (factors[0] != factors[1])
              factors[0]=0;
          }
      if ((factors[0] != 1) && (factors[0] != 2))
        (void) ThrowMagickException(&image->exception,GetMagickModule(),
          CoderWarning,"ignoring sampling-factor","=%s",sampling_factor);
      else if (channels != 0)
        {
          /*
            Cross check given color type and subsampling.
          */
          factors[1]=((channels == IMF_WRITE_YCA) ||
            (channels == IMF_WRITE_YC)) ? 2 : 1;
          if (factors[0] != factors[1])
            (void) ThrowMagickException(&image->exception,GetMagickModule(),
              CoderWarning,"sampling-factor and color type mismatch","=%s",
              sampling_factor);
        }
    }
  if (channels == 0)
    {
      /*
        If no color type given, select it now.
      */
      if (factors[0] == 2)
        channels=image->matte ? IMF_WRITE_YCA : IMF_WRITE_YC;
      else
        channels=image->matte ? IMF_WRITE_RGBA : IMF_WRITE_RGB;
    }
  ImfHeaderSetCompression(hdr_info,compression);
  ImfHeaderSetLineOrder(hdr_info,IMF_INCREASING_Y);
  file=ImfOpenOutputFile(write_info->filename,hdr_info,channels);
  ImfDeleteHeader(hdr_info);
  if (file == (ImfOutputFile *) NULL)
    {
      (void) RelinquishUniqueFileResource(write_info->filename);
      write_info=DestroyImageInfo(write_info);
      ThrowFileException(&image->exception,BlobError,"UnableToOpenBlob",
        ImfErrorMessage());
      return(MagickFalse);
    }
  scanline=(ImfRgba *) AcquireQuantumMemory(image->columns,sizeof(*scanline));
  if (scanline == (ImfRgba *) NULL)
    {
      (void) ImfCloseOutputFile(file);
      (void) RelinquishUniqueFileResource(write_info->filename);
      write_info=DestroyImageInfo(write_info);
      ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
    }
  ResetMagickMemory(scanline,0,image->columns*sizeof(*scanline));
  for (y=0; y < (ssize_t) image->rows; y++)
  {
    p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
    if (p == (const PixelPacket *) NULL)
      break;
    for (x=0; x < (ssize_t) image->columns; x++)
    {
      ImfFloatToHalf(QuantumScale*GetPixelRed(p),&half_quantum);
      scanline[x].r=half_quantum;
      ImfFloatToHalf(QuantumScale*GetPixelGreen(p),&half_quantum);
      scanline[x].g=half_quantum;
      ImfFloatToHalf(QuantumScale*GetPixelBlue(p),&half_quantum);
      scanline[x].b=half_quantum;
      if (image->matte == MagickFalse)
        ImfFloatToHalf(1.0,&half_quantum);
      else
        ImfFloatToHalf(1.0-QuantumScale*GetPixelOpacity(p),&half_quantum);
      scanline[x].a=half_quantum;
      p++;
    }
    ImfOutputSetFrameBuffer(file,scanline-(y*image->columns),1,image->columns);
    ImfOutputWritePixels(file,1);
  }
  (void) ImfCloseOutputFile(file);
  scanline=(ImfRgba *) RelinquishMagickMemory(scanline);
  (void) FileToImage(image,write_info->filename);
  (void) RelinquishUniqueFileResource(write_info->filename);
  write_info=DestroyImageInfo(write_info);
  (void) CloseBlob(image);
  return(MagickTrue);
}
#endif
