diff --git a/.gitignore b/.gitignore
new file mode 100644
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,1 @@
+.stack-work
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,169 @@
+# This is the complex Travis configuration, which is intended for use
+# on open source libraries which need compatibility across multiple GHC
+# versions, must work with cabal-install, and should be
+# cross-platform. For more information and other options, see:
+#
+# https://docs.haskellstack.org/en/stable/travis_ci/
+#
+# Copy these contents into the root directory of your Github project in a file
+# named .travis.yml
+
+# Use new container infrastructure to enable caching
+sudo: false
+
+# Do not choose a language; we provide our own build tools.
+language: generic
+
+# Caching so the next build will be fast too.
+cache:
+ directories:
+ - $HOME/.ghc
+ - $HOME/.cabal
+ - $HOME/.stack
+
+# The different configurations we want to test. We have BUILD=cabal which uses
+# cabal-install, and BUILD=stack which uses Stack. More documentation on each
+# of those below.
+#
+# We set the compiler values here to tell Travis to use a different
+# cache file per set of arguments.
+#
+# If you need to have different apt packages for each combination in the
+# matrix, you can use a line such as:
+# addons: {apt: {packages: [libfcgi-dev,libgmp-dev]}}
+matrix:
+ include:
+ # We grab the appropriate GHC and cabal-install versions from hvr's PPA. See:
+ # https://github.com/hvr/multi-ghc-travis
+ addons: {apt: {packages: [cabal-install-1.18,ghc-7.8.4,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
+ - env: BUILD=cabal GHCVER=7.10.3 CABALVER=1.22 HAPPYVER=1.19.5 ALEXVER=3.1.7
+ compiler: ": #GHC 7.10.3"
+ addons: {apt: {packages: [cabal-install-1.22,ghc-7.10.3,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
+ - env: BUILD=cabal GHCVER=8.0.2 CABALVER=1.24 HAPPYVER=1.19.5 ALEXVER=3.1.7
+ compiler: ": #GHC 8.0.2"
+ addons: {apt: {packages: [cabal-install-1.24,ghc-8.0.2,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
+
+ # Build with the newest GHC and cabal-install. This is an accepted failure,
+ # see below.
+ - env: BUILD=cabal GHCVER=head CABALVER=head HAPPYVER=1.19.5 ALEXVER=3.1.7
+ compiler: ": #GHC HEAD"
+ addons: {apt: {packages: [cabal-install-head,ghc-head,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
+
+ # The Stack builds. We can pass in arbitrary Stack arguments via the ARGS
+ # variable, such as using --stack-yaml to point to a different file.
+ - env: BUILD=stack ARGS=""
+ compiler: ": #stack default"
+ addons: {apt: {packages: [libgmp-dev]}}
+
+ - env: BUILD=stack ARGS="--resolver lts-7"
+ compiler: ": #stack 8.0.1"
+ addons: {apt: {packages: [libgmp-dev]}}
+
+ - env: BUILD=stack ARGS="--resolver lts-8"
+ compiler: ": #stack 8.0.2"
+ addons: {apt: {packages: [libgmp-dev]}}
+
+ # Nightly builds are allowed to fail
+ - env: BUILD=stack ARGS="--resolver nightly"
+ compiler: ": #stack nightly"
+ addons: {apt: {packages: [libgmp-dev]}}
+
+ # Build on macOS in addition to Linux
+ - env: BUILD=stack ARGS=""
+ compiler: ": #stack default osx"
+ os: osx
+
+ - env: BUILD=stack ARGS="--resolver lts-7"
+ compiler: ": #stack 8.0.1 osx"
+ os: osx
+
+ - env: BUILD=stack ARGS="--resolver lts-8"
+ compiler: ": #stack 8.0.2 osx"
+ os: osx
+
+ - env: BUILD=stack ARGS="--resolver nightly"
+ compiler: ": #stack nightly osx"
+ os: osx
+
+ allow_failures:
+ - env: BUILD=cabal GHCVER=head CABALVER=head HAPPYVER=1.19.5 ALEXVER=3.1.7
+ - env: BUILD=stack ARGS="--resolver nightly"
+
+before_install:
+# Using compiler above sets CC to an invalid value, so unset it
+- unset CC
+
+# We want to always allow newer versions of packages when building on GHC HEAD
+- CABALARGS=""
+- if [ "x$GHCVER" = "xhead" ]; then CABALARGS=--allow-newer; fi
+
+# Download and unpack the stack executable
+- export PATH=/opt/ghc/$GHCVER/bin:/opt/cabal/$CABALVER/bin:$HOME/.local/bin:/opt/alex/$ALEXVER/bin:/opt/happy/$HAPPYVER/bin:$HOME/.cabal/bin:$PATH
+- mkdir -p ~/.local/bin
+- |
+ if [ `uname` = "Darwin" ]
+ then
+ travis_retry curl --insecure -L https://www.stackage.org/stack/osx-x86_64 | tar xz --strip-components=1 --include '*/stack' -C ~/.local/bin
+ else
+ travis_retry curl -L https://www.stackage.org/stack/linux-x86_64 | tar xz --wildcards --strip-components=1 -C ~/.local/bin '*/stack'
+ fi
+
+ # Use the more reliable S3 mirror of Hackage
+ mkdir -p $HOME/.cabal
+ echo 'remote-repo: hackage.haskell.org:http://hackage.fpcomplete.com/' > $HOME/.cabal/config
+ echo 'remote-repo-cache: $HOME/.cabal/packages' >> $HOME/.cabal/config
+
+ if [ "$CABALVER" != "1.16" ]
+ then
+ echo 'jobs: $ncpus' >> $HOME/.cabal/config
+ fi
+
+install:
+- echo "$(ghc --version) [$(ghc --print-project-git-commit-id 2> /dev/null || echo '?')]"
+- if [ -f configure.ac ]; then autoreconf -i; fi
+- |
+ set -ex
+ case "$BUILD" in
+ stack)
+ stack --no-terminal --install-ghc $ARGS test --bench --only-dependencies
+ ;;
+ cabal)
+ cabal --version
+ travis_retry cabal update
+
+ # Get the list of packages from the stack.yaml file
+ PACKAGES=$(stack --install-ghc query locals | grep '^ *path' | sed 's@^ *path:@@')
+
+ cabal install --only-dependencies --enable-tests --enable-benchmarks --force-reinstalls --ghc-options=-O0 --reorder-goals --max-backjumps=-1 $CABALARGS $PACKAGES
+ ;;
+ esac
+ set +ex
+
+script:
+- |
+ set -ex
+ case "$BUILD" in
+ stack)
+ stack --no-terminal $ARGS test --bench --no-run-benchmarks --haddock --no-haddock-deps
+ ;;
+ cabal)
+ cabal install --enable-tests --enable-benchmarks --force-reinstalls --ghc-options=-O0 --reorder-goals --max-backjumps=-1 $CABALARGS $PACKAGES
+
+ ORIGDIR=$(pwd)
+ for dir in $PACKAGES
+ do
+ cd $dir
+ cabal check || [ "$CABALVER" == "1.16" ]
+ cabal sdist
+ PKGVER=$(cabal info . | awk '{print $2;exit}')
+ SRC_TGZ=$PKGVER.tar.gz
+ cd dist
+ tar zxfv "$SRC_TGZ"
+ cd "$PKGVER"
+ cabal configure --enable-tests
+ cabal build
+ cd $ORIGDIR
+ done
+ ;;
+ esac
+ set +ex
diff --git a/LICENSE b/LICENSE
new file mode 100644
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+ GNU GENERAL PUBLIC LICENSE
+ Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc.
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+ Preamble
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+.
diff --git a/README.md b/README.md
new file mode 100644
--- /dev/null
+++ b/README.md
@@ -0,0 +1,40 @@
+Haskell OpenEXR Library
+=======================
+
+This library can write colored images which use floating point values into
+OpenEXR (v2) high-dynamic-range file format.
+
+Supported features:
+
+- scanline format
+- compression (ZIPS, ZIP)
+- pixel format (RGB float32)
+
+
+
+Usage
+-----
+
+Modify project's `stack.yaml` by adding path to `openexr-write` package.
+
+```
+packages:
+- '.'
+- path/openexr-write
+```
+
+An image can be written by calling `writeFile` function. For example,
+following code stores a compressed image consisting of one red pixel.
+
+```
+module Main where
+
+import qualified Data.Vector as V
+import qualified Graphics.OpenEXR as EXR
+
+
+main :: IO ()
+main = do
+ let image = EXR.ImageRGBF 1 1 (V.fromList [EXR.PixelRGBF 1.0 0.0 0.0])
+ EXR.writeFile "image.exr" image EXR.ZipCompression
+```
diff --git a/Setup.hs b/Setup.hs
new file mode 100644
--- /dev/null
+++ b/Setup.hs
@@ -0,0 +1,2 @@
+import Distribution.Simple
+main = defaultMain
diff --git a/openexr-write.cabal b/openexr-write.cabal
new file mode 100644
--- /dev/null
+++ b/openexr-write.cabal
@@ -0,0 +1,51 @@
+name: openexr-write
+version: 0.1.0.0
+synopsis: Library to write images in OpenEXR HDR file format.
+description: OpenEXR allows to store pixels as floating point numbers and thus can capture high dynamic range.
+homepage: https://github.com/pavolzetor/openexr-write#readme
+license: GPL-3
+license-file: LICENSE
+author: Pavol Klacansky
+maintainer: pavol@klacansky.com
+copyright: 2017 Pavol Klacansky
+category: Graphics
+build-type: Simple
+extra-source-files: .gitignore
+ .travis.yml
+ README.md
+ stack.yaml
+ test/generate.cpp
+ test/images/red_1x1_no_compression.exr
+ test/images/red_1x1_zips_compression.exr
+ test/images/red_1x1_zip_compression.exr
+cabal-version: >=1.10
+
+library
+ hs-source-dirs: src
+ exposed-modules: Graphics.OpenEXR
+ build-depends: base >= 4.8 && < 5
+ , binary
+ , bytestring
+ , data-binary-ieee754
+ , deepseq
+ , split
+ , vector
+ , vector-split
+ , zlib
+ default-language: Haskell2010
+
+test-suite spec
+ type: exitcode-stdio-1.0
+ hs-source-dirs: test
+ main-is: Spec.hs
+ build-depends: base >= 4.7 && < 5
+ , bytestring
+ , directory
+ , hspec
+ , openexr-write
+ , vector
+ default-language: Haskell2010
+
+source-repository head
+ type: git
+ location: https://github.com/pavolzetor/openexr-write
diff --git a/src/Graphics/OpenEXR.hs b/src/Graphics/OpenEXR.hs
new file mode 100644
--- /dev/null
+++ b/src/Graphics/OpenEXR.hs
@@ -0,0 +1,268 @@
+{-# LANGUAGE DeriveAnyClass, DeriveGeneric, FlexibleContexts, OverloadedStrings #-}
+
+
+-------------------------------------------------------------------------------
+-- |
+-- Module : Graphics.OpenEXR
+-- Copyright : (c) 2017 Pavol Klacansky
+-- License : GPL-3
+--
+-- Maintainer : pavol@klacansky.com
+-- Stability : experimental
+-- Portability : portable
+--
+-- Library for writting OpenEXR images which support high dynamic range. These
+-- images are common in computer graphics, especially ray tracing, and can be
+-- used to delay quantization to the post-processing stage.
+--
+--
+-- An example of writting 1x1 ZIP compressed image consisting of a red pixel.
+--
+-- > module Main where
+-- >
+-- > import qualified Data.Vector as V
+-- > import qualified Graphics.OpenEXR as EXR
+-- >
+-- >
+-- > main :: IO ()
+-- > main = do
+-- > let image = EXR.ImageRGBF 1 1 (V.fromList [EXR.PixelRGBF 1.0 0.0 0.0])
+-- > EXR.writeFile "image.exr" image EXR.ZipCompression
+-------------------------------------------------------------------------------
+
+
+
+
+module Graphics.OpenEXR
+ ( Image(..)
+ , PixelRGBF(..)
+ , CompressionType(..)
+ , writeFile
+ ) where
+
+
+
+
+import Prelude hiding (writeFile)
+
+import Codec.Compression.Zlib (compress)
+import Control.DeepSeq (NFData)
+import Data.Binary (Binary, get, put)
+import Data.Binary.IEEE754 (putFloat32le)
+import Data.Binary.Put (Put, putLazyByteString, putWord8, putWord32le, putWord64le, runPut)
+import qualified Data.ByteString.Lazy as BL
+import Data.List.Split (chunksOf)
+import qualified Data.Vector as V
+import qualified Data.Vector.Split as V -- TODO: implement internally (trivial) to reduce dependency if we want this module as separate package
+import Data.Word (Word8, Word32)
+import GHC.Generics (Generic)
+
+
+
+
+data Image = ImageRGBF
+ { imageWidth :: !Int
+ , imageHeight :: !Int
+ , imageData :: V.Vector PixelRGBF -- ^ Stored in row-major layout
+ } deriving (Generic, NFData, Show)
+
+
+data PixelRGBF = PixelRGBF !Float !Float !Float
+ deriving (Generic, NFData, Show)
+
+
+data CompressionType = NoCompression -- ^ No compression applied
+ | ZipsCompression -- ^ DEFLATE lossless compression applied per scanline
+ | ZipCompression -- ^ DEFLATE lossless compression applied per 16 scanlines
+
+
+data Attribute = Attribute BL.ByteString AttributeType
+
+
+data AttributeType = Box2i (Word32, Word32, Word32, Word32)
+ | Chlist [Channel]
+ | Compression CompressionType
+ | Float Float
+ | LineOrder LineOrderType
+ | V2f (Float, Float)
+
+
+data Channel = Channel
+ { name :: BL.ByteString
+ , pixelType :: PixelType
+ , pLinear :: Word8
+ , reserved :: (Word8, Word8, Word8)
+ , xSampling :: Word32
+ , ySampling :: Word32
+ }
+
+
+data PixelType = PixelUint | PixelHalf | PixelFloat
+ deriving Enum
+
+
+data LineOrderType = IncreasingY | DecreasingY | RandomY
+ deriving Enum
+
+
+
+
+instance Binary Attribute where
+ get = undefined
+ put (Attribute n t) = putLazyByteString (BL.snoc n 0) >> put t
+
+
+instance Binary AttributeType where
+ get = undefined
+ put a@(Box2i (x, y, z, w)) = putLazyByteString "box2i\0" >> putWord32le (attrSize a) >> putWord32le x >> putWord32le y >> putWord32le z >> putWord32le w
+ put a@(Chlist xs) = putLazyByteString "chlist\0" >> putWord32le (attrSize a) >> mapM_ put xs >> put '\0'
+ put a@(Compression x) = putLazyByteString "compression\0" >> putWord32le (attrSize a) >> put x
+ put a@(Float x) = putLazyByteString "float\0" >> putWord32le (attrSize a) >> putFloat32le x
+ put a@(LineOrder x) = putLazyByteString "lineOrder\0" >> putWord32le (attrSize a) >> put x
+ put a@(V2f (x, y)) = putLazyByteString "v2f\0" >> putWord32le (attrSize a) >> putFloat32le x >> putFloat32le y
+
+
+instance Binary Channel where
+ get = undefined
+ put x = do
+ putLazyByteString (BL.snoc (name x) 0)
+ put (pixelType x)
+ put (pLinear x)
+ put (reserved x)
+ putWord32le (xSampling x)
+ putWord32le (ySampling x)
+
+
+instance Binary PixelType where
+ get = undefined
+ put = putWord32le . fromIntegral . fromEnum
+
+
+instance Enum CompressionType where
+ fromEnum NoCompression = 0
+ fromEnum ZipsCompression = 2
+ fromEnum ZipCompression = 3
+ toEnum _ = undefined
+
+
+instance Binary CompressionType where
+ get = undefined
+ put = putWord8 . fromIntegral . fromEnum
+
+
+instance Binary LineOrderType where
+ get = undefined
+ put = putWord8 . fromIntegral . fromEnum
+
+
+
+
+-- | Write an 'Image' using a 'CompressionType' to an OpenEXR formatted file
+writeFile :: FilePath -> Image -> CompressionType -> IO ()
+writeFile filepath img compression = BL.writeFile filepath (header `BL.append` offTable `BL.append` (BL.concat cs))
+ where header = runPut (magicNumber >> versionField >> mapM_ put attributes >> put '\0')
+ offTable = runPut (offsetTable (fromIntegral $ BL.length header) ((fromIntegral . BL.length) <$> cs))
+ cs = runPut <$> chunks img compression
+ attributes = [ Attribute "channels" channels
+ , Attribute "compression" (Compression compression)
+ , Attribute "dataWindow" (Box2i (0, 0, w, h))
+ , Attribute "displayWindow" (Box2i (0, 0, w, h))
+ , Attribute "lineOrder" (LineOrder IncreasingY)
+ , Attribute "pixelAspectRatio" (Float 1)
+ , Attribute "screenWindowCenter" (V2f (0, 0))
+ , Attribute "screenWindowWidth" (Float 1)]
+ channels = Chlist [ Channel "B" PixelFloat 0 (0, 0, 0) 1 1
+ , Channel "G" PixelFloat 0 (0, 0, 0) 1 1
+ , Channel "R" PixelFloat 0 (0, 0, 0) 1 1
+ ]
+ w = fromIntegral (imageWidth img) - 1
+ h = fromIntegral (imageHeight img) - 1
+
+
+
+
+attrSize :: AttributeType -> Word32
+attrSize (Box2i _) = 16
+attrSize (Chlist xs) = fromIntegral ((sum . map (\x -> (BL.length . name $ x) + 1 + 4 + 1 + 3 + 4 + 4) $ xs) + 1)
+attrSize (Compression _) = 1
+attrSize (Float _) = 4
+attrSize (LineOrder _) = 1
+attrSize (V2f _) = 8
+
+
+
+
+magicNumber :: Put
+magicNumber = mapM_ putWord8 [0x76, 0x2F, 0x31, 0x01]
+
+
+
+
+versionField :: Put
+versionField = mapM_ putWord8 [0x02, 0x00, 0x00, 0x00]
+
+
+
+
+-- TODO: use some generic version of length
+-- TODO: partial function (init)
+offsetTable :: Integral a => a -> [a] -> Put
+offsetTable offset chunksLengths = mapM_ (\x -> putWord64le (fromIntegral (offset + 8*nChunks + x))) . scanl (+) 0 . init $ chunksLengths
+ where nChunks = fromIntegral $ length chunksLengths
+
+
+
+
+scanlinesPerChunk :: Num a => CompressionType -> a
+scanlinesPerChunk ZipCompression = 16
+scanlinesPerChunk _ = 1
+
+
+
+
+transform :: CompressionType -> (BL.ByteString -> BL.ByteString)
+transform ZipsCompression = compress . preZip
+transform ZipCompression = compress . preZip
+transform _ = id
+
+
+
+
+chunks :: Image -> CompressionType -> [Put]
+chunks (ImageRGBF width height px) c = uncurry f <$> zip [0,yStride..] (chunksOf yStride cs)
+ where cs = V.chunksOf width px
+ yStride = scanlinesPerChunk c
+ f y xs = do
+ let d = runPut . mapM_ scanline $ xs
+ transformed = transform c d
+ result = if BL.length d <= BL.length transformed then d else transformed
+ putWord32le (fromIntegral y)
+ putWord32le (fromIntegral (BL.length result))
+ putLazyByteString result
+
+
+
+
+scanline :: V.Vector PixelRGBF -> Put
+scanline xs = do
+ mapM_ (\(PixelRGBF _ _ b) -> putFloat32le b) xs
+ mapM_ (\(PixelRGBF _ g _) -> putFloat32le g) xs
+ mapM_ (\(PixelRGBF r _ _) -> putFloat32le r) xs
+
+
+
+
+-- TODO: potentially optimize by not creating the temporary copy and instead use strided access
+-- TODO: converting to lists may be inefficient, but lazyness should take care of it
+preZip :: BL.ByteString -> BL.ByteString
+preZip d = BL.pack (x:zipWith predictor (x:xs ++ ys) (xs ++ ys))
+ where (x:xs, ys) = deinterleave (BL.unpack d)
+ predictor p x = fromIntegral x - fromIntegral p + (128 + 256)
+
+
+
+
+deinterleave :: [a] -> ([a], [a])
+deinterleave [x] = ([x], [])
+deinterleave [x,y] = ([x], [y])
+deinterleave (x:y:xs) = let (as, bs) = deinterleave xs in (x:as, y:bs)
diff --git a/stack.yaml b/stack.yaml
new file mode 100644
--- /dev/null
+++ b/stack.yaml
@@ -0,0 +1,66 @@
+# This file was automatically generated by 'stack init'
+#
+# Some commonly used options have been documented as comments in this file.
+# For advanced use and comprehensive documentation of the format, please see:
+# http://docs.haskellstack.org/en/stable/yaml_configuration/
+
+# Resolver to choose a 'specific' stackage snapshot or a compiler version.
+# A snapshot resolver dictates the compiler version and the set of packages
+# to be used for project dependencies. For example:
+#
+# resolver: lts-3.5
+# resolver: nightly-2015-09-21
+# resolver: ghc-7.10.2
+# resolver: ghcjs-0.1.0_ghc-7.10.2
+# resolver:
+# name: custom-snapshot
+# location: "./custom-snapshot.yaml"
+resolver: lts-8.21
+
+# User packages to be built.
+# Various formats can be used as shown in the example below.
+#
+# packages:
+# - some-directory
+# - https://example.com/foo/bar/baz-0.0.2.tar.gz
+# - location:
+# git: https://github.com/commercialhaskell/stack.git
+# commit: e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+# - location: https://github.com/commercialhaskell/stack/commit/e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+# extra-dep: true
+# subdirs:
+# - auto-update
+# - wai
+#
+# A package marked 'extra-dep: true' will only be built if demanded by a
+# non-dependency (i.e. a user package), and its test suites and benchmarks
+# will not be run. This is useful for tweaking upstream packages.
+packages:
+- '.'
+# Dependency packages to be pulled from upstream that are not in the resolver
+# (e.g., acme-missiles-0.3)
+extra-deps: []
+
+# Override default flag values for local packages and extra-deps
+flags: {}
+
+# Extra package databases containing global packages
+extra-package-dbs: []
+
+# Control whether we use the GHC we find on the path
+# system-ghc: true
+#
+# Require a specific version of stack, using version ranges
+# require-stack-version: -any # Default
+# require-stack-version: ">=1.2"
+#
+# Override the architecture used by stack, especially useful on Windows
+# arch: i386
+# arch: x86_64
+#
+# Extra directories used by stack for building
+# extra-include-dirs: [/path/to/dir]
+# extra-lib-dirs: [/path/to/dir]
+#
+# Allow a newer minor version of GHC than the snapshot specifies
+# compiler-check: newer-minor
diff --git a/test/Spec.hs b/test/Spec.hs
new file mode 100644
--- /dev/null
+++ b/test/Spec.hs
@@ -0,0 +1,34 @@
+-- TODO: maybe add function that returns bytestring
+-- TODO: test against images saved by the official OpenEXR library
+
+import qualified Data.ByteString.Lazy as BL
+import qualified Data.Vector as V
+import System.Directory (removeFile)
+import Test.Hspec
+
+import qualified Graphics.OpenEXR as EXR
+
+
+
+
+main :: IO ()
+main = hspec $ after_ (removeFile "tmp.exr") $ do
+ let image = EXR.ImageRGBF 1 1 (V.fromList [EXR.PixelRGBF 1 0 0])
+ folder = "test/images/"
+
+ describe "OpenEXR.writeFile" $ do
+ it "saves image without compression" $ do
+ EXR.writeFile "tmp.exr" image EXR.NoCompression
+ output <- BL.readFile "tmp.exr"
+ valid <- BL.readFile (folder ++ "red_1x1_no_compression.exr")
+ output `shouldBe` valid
+ it "saves image with ZIPS compression" $ do
+ EXR.writeFile "tmp.exr" image EXR.ZipsCompression
+ output <- BL.readFile "tmp.exr"
+ valid <- BL.readFile (folder ++ "red_1x1_zips_compression.exr")
+ output `shouldBe` valid
+ it "saves image with ZIP compression" $ do
+ EXR.writeFile "tmp.exr" image EXR.ZipCompression
+ output <- BL.readFile "tmp.exr"
+ valid <- BL.readFile (folder ++ "red_1x1_zip_compression.exr")
+ output `shouldBe` valid
diff --git a/test/generate.cpp b/test/generate.cpp
new file mode 100644
--- /dev/null
+++ b/test/generate.cpp
@@ -0,0 +1,44 @@
+/* PURPOSE: generate test files using ILM's OpenEXR library (i.e., the standard) */
+
+
+#include
+#include
+
+
+
+
+static void
+generate(char const *const filepath, Imf::Compression const compression)
+{
+ float const r_pixels[] = {1.0f};
+ float const g_pixels[] = {0.0f};
+ float const b_pixels[] = {0.0f};
+ int const width = 1;
+ int const height = 1;
+
+ Imf::Header header(width, height, 1, Imath::V2f(0, 0), 1, Imf::INCREASING_Y, compression);
+ header.channels().insert("B", Imf::Channel(Imf::FLOAT));
+ header.channels().insert("G", Imf::Channel(Imf::FLOAT));
+ header.channels().insert("R", Imf::Channel(Imf::FLOAT));
+
+ Imf::OutputFile file(filepath, header);
+
+ Imf::FrameBuffer fb;
+ fb.insert("B", Imf::Slice(Imf::FLOAT, (char *)b_pixels, sizeof *b_pixels, sizeof *b_pixels*width));
+ fb.insert("G", Imf::Slice(Imf::FLOAT, (char *)g_pixels, sizeof *g_pixels, sizeof *g_pixels*width));
+ fb.insert("R", Imf::Slice(Imf::FLOAT, (char *)r_pixels, sizeof *r_pixels, sizeof *r_pixels*width));
+
+ file.setFrameBuffer(fb);
+ file.writePixels(height);
+}
+
+
+
+
+int
+main(void)
+{
+ generate("images/red_1x1_no_compression.exr", Imf::NO_COMPRESSION);
+ generate("images/red_1x1_zips_compression.exr", Imf::ZIPS_COMPRESSION);
+ generate("images/red_1x1_zip_compression.exr", Imf::ZIP_COMPRESSION);
+}
diff --git a/test/images/red_1x1_no_compression.exr b/test/images/red_1x1_no_compression.exr
new file mode 100644
Binary files /dev/null and b/test/images/red_1x1_no_compression.exr differ
diff --git a/test/images/red_1x1_zip_compression.exr b/test/images/red_1x1_zip_compression.exr
new file mode 100644
Binary files /dev/null and b/test/images/red_1x1_zip_compression.exr differ
diff --git a/test/images/red_1x1_zips_compression.exr b/test/images/red_1x1_zips_compression.exr
new file mode 100644
Binary files /dev/null and b/test/images/red_1x1_zips_compression.exr differ