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finish first draft of add_maybe_clipped

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This commit is contained in:
Corey O'Connor 2013-05-20 23:41:25 -07:00
parent 73415951e0
commit 48137d0a80
1 changed files with 14 additions and 31 deletions
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45
src/Graphics/Vty/Span.hs
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@ -1,11 +1,9 @@
{-# LANGUAGE MultiWayIf #-}
-- Copyright Corey O'Connor
{-# LANGUAGE TemplateHaskell #-}
-- Copyright 2009-2010 Corey O'Connor
{-# LANGUAGE BangPatterns #-}
{-# LANGUAGE ExistentialQuantification #-}
{-# LANGUAGE NamedFieldPuns #-}
{-# LANGUAGE GADTs #-}
{-# LANGUAGE ExistentialQuantification #-}
{-# LANGUAGE ScopedTypeVariables #-}
-- The ops to define the content for an output region.
module Graphics.Vty.Span
@ -281,6 +279,19 @@ add_maybe_clipped BGFill {output_width, output_height} = do
let output_width' = min (output_width - s.^skip_columns) s.^remaining_columns
output_height' = min (output_height - s.^skip_rows ) s.^remaining_rows
add_unclipped (BGFill output_width' output_height')
add_maybe_clipped CropRight {cropped_image, output_width} = do
remaining_columns .= output_width
add_maybe_clipped cropped_image
add_maybe_clipped CropLeft {cropped_image, left_skip} = do
skip_columns += left_skip
add_maybe_clipped cropped_image
add_maybe_clipped CropBottom {cropped_image, output_height} = do
remaining_rows .= output_height
add_maybe_clipped cropped_image
add_maybe_clipped CropTop {cropped_image, top_skip} = do
skip_rows += top_skip
add_maybe_clipped cropped_image
add_maybe_clipped_join name skip remaining offset i0_dim i0 i1 size = do
state <- get
when (state^.remaining == 0) $ fail $ name ++ " with remaining == 0"
@ -328,34 +339,6 @@ add_unclipped_text txt = do
used_display_columns = wcswidth $ TL.unpack txt
use row_offset >>= snoc_op op
-- | Add a background fill of the given column width to the row display operations.
--
-- This has a fast path for background characters that are a single column and a single byte.
-- Otherwise this has to compute the width of the background character and replicate a sequence of
-- bytes to fill in the required width.
snoc_bg_fill :: MRowOps s -> Background -> Int -> Int -> ST s ()
snoc_bg_fill _row_ops _bg 0 _row
= return ()
snoc_bg_fill mrow_ops (Background c back_attr) fill_length row
= do
snoc_op mrow_ops row $ AttributeChange back_attr
-- By all likelyhood the background character will be an ASCII character. Which is a single
-- byte in utf8. Optimize for this special case.
utf8_bs <- if c <= (toEnum 255 :: Char)
then
let !(c_byte :: Word8) = BInt.c2w c
in unsafeIOToST $ do
BInt.create fill_length
$ \ptr -> mapM_ (\i -> pokeByteOff ptr i c_byte)
[0 .. (fill_length - 1)]
else
let !(c_bytes :: [Word8]) = encode [c]
in unsafeIOToST $ do
BInt.create (fill_length * length c_bytes)
$ \ptr -> mapM_ (\(i,b) -> pokeByteOff ptr i b)
$ zip [0 .. (fill_length - 1)] (cycle c_bytes)
snoc_op mrow_ops row $ TextSpan fill_length fill_length (UTF8.fromRep utf8_bs)
-- | snocs the operation to the operations for the given row.
snoc_op :: SpanOp -> Int -> BlitM s ()
snoc_op !op !row = do