raphaelj/repa-devil

Image library based on the DevIL open source image library for the repa array library.

repa-devil's Issues

Build failure with GHC 7.8

Subset of the output:

Unpacking to repa-devil-0.3.2.3/
Resolving dependencies...
Configuring repa-devil-0.3.2.3...
Building repa-devil-0.3.2.3...
Preprocessing library repa-devil-0.3.2.3...
[1 of 1] Compiling Data.Array.Repa.IO.DevIL ( dist/build/Data/Array/Repa/IO/DevIL.hs, dist/build/Data/Array/Repa/IO/DevIL.o )

Data/Array/Repa/IO/DevIL.hsc:92:40:
    Not in scope: type constructor or class ‘Applicative’

Data/Array/Repa/IO/DevIL.hsc:180:24: Not in scope: ‘<$>’

Data/Array/Repa/IO/DevIL.hsc:212:31: Not in scope: ‘<$>’

Data/Array/Repa/IO/DevIL.hsc:217:17: Not in scope: ‘<$>’

Data/Array/Repa/IO/DevIL.hsc:220:18: Not in scope: ‘<$>’

Data/Array/Repa/IO/DevIL.hsc:223:17: Not in scope: ‘<$>’

Data/Array/Repa/IO/DevIL.hsc:226:18: Not in scope: ‘<$>’

Data/Array/Repa/IO/DevIL.hsc:229:18: Not in scope: ‘<$>’

Data/Array/Repa/IO/DevIL.hsc:232:18: Not in scope: ‘<$>’

Data/Array/Repa/IO/DevIL.hsc:247:27: Not in scope: ‘<$>’

Data/Array/Repa/IO/DevIL.hsc:261:15: Not in scope: ‘<$>’

Data/Array/Repa/IO/DevIL.hsc:266:15: Not in scope: ‘<$>’

Data/Array/Repa/IO/DevIL.hsc:271:15: Not in scope: ‘<$>’

Data/Array/Repa/IO/DevIL.hsc:276:15: Not in scope: ‘<$>’

Data/Array/Repa/IO/DevIL.hsc:281:15: Not in scope: ‘<$>’

transformers-0.5

I know this package is deprecated, but I have some old code that uses it that I want to keep working.

My code (and repa-devil) compiles and works correctly with cabal new-install -w ghc-8.6.1 --allow-newer=transformers, so I suspect the dependency bound can simply be lifted, suggest transformers >= 0.2 && < 0.6

It could be fixed by a metadata revision on Hackage (no need to upload a whole new version).

Support of multichannel images

Hi! Would it be possible to read and save multichannel images using DevIL or ResIL (http://resil.sourceforge.net/) Haskell binding? I want to read .exr images, which has over a 100 of channels.

Thank you.

Either TGA open or saving appears not work correctly

If I open a greyscale tga and then write it back out without doing anything, the image is not nearly then same. The pixels are interleaved in some odd way, and it doesn't look anything like the original

Support for transformers 0.4

This is needed for GHC 7.10 support.

Dimensions in Image constructors

This question relates to the dimensions in the five constructors:

RGBA (Array F DIM3 Word8)    
RGB (Array F DIM3 Word8)     
BGRA (Array F DIM3 Word8)    
BGR (Array F DIM3 Word8)     
Grey (Array F DIM2 Word8)    

Only the Grey constructor has a two dimensional array type parameter DIM2, the rest take a three dimensional array DIM3. Here are the sources for repa-examples:
https://github.com/DDCSF/repa/tree/master/repa-examples

Many of the repa examples operate on two dimensional arrays, for example:

blur :: Monad m => Int -> Array U DIM2 Double -> m (Array U DIM2 Double)
gradientX_sep :: Array DIM2 Float -> Array DIM2 Float
blurSepX :: Array U DIM2 Float -> IO (Array U DIM2 Float)
solveLaplace
        :: Monad m
        => Int                        -- ^ Number of iterations to use.
        -> Array U DIM2 Double        -- ^ Boundary value mask.
        -> Array U DIM2 Double        -- ^ Boundary values.
        -> Array U DIM2 Double        -- ^ Initial state.
        -> m (Array U DIM2 Double)

• blur https://github.com/DDCSF/repa/blob/master/repa-examples/examples/Blur/src-repa/Main.hs#L71
• laplace https://github.com/DDCSF/repa/blob/master/repa-examples/examples/Laplace/src-repa/SolverStencil.hs#L12
• sobel https://github.com/DDCSF/repa/blob/master/repa-examples/examples/Sobel/src-repa/SolverSeparated.hs#L12
• canny https://github.com/DDCSF/repa/blob/master/repa-examples/examples/Canny/src-repa/Main.hs#L32

And so on... Does this mean that all the repa examples can only operate on DIM2 greyscale images? Or does this imply a separation between the use of repa dimensions in devil-repa (colour images are DIM3) and repa-examples (images are DIM2).

linking on Windows

When I tried to compile a Haskell package importing repa-devil on Windows it gave linking errors complaining about undefined references to IL functions such as:

 Linking dist\build\test\test.exe ...
 dist\build\shapes\test-tmp\Main.o:fake:(.text+0x71900): undefined reference to `ilInit'
 dist\build\shapes\test-tmp\Main.o:fake:(.text+0x71910): undefined reference to `ilOriginFunc'

I was able to fix it by replacing all foreign import ccall calling conventions by stdcall, eg.

 foreign import ccall unsafe "ilInit" ilInitC :: IO ()

by

 foreign import stdcall unsafe "ilInit" ilInitC :: IO ()

After reinstalling such a modified repa-devil I can read and write PNG images etc.

This is my setup:

• Windows7 64 bit
• Haskell Platform (comes with MinGW)
• install MSys and MSysDTK as described in http://blog.johantibell.com/2011/01/setting-up-haskell-development.html
• install nasm using its Windows installer
• install zlib, libpng, libjpeg-turbo and then devil from source

A small Haskell program which triggers the error:

module Main where

import Data.Array.Repa.IO.DevIL

main = runIL $ do
  (RGB im) <- readImage "blah.png"
  return ()