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93 lines
4.1 KiB
Haskell
93 lines
4.1 KiB
Haskell
{-# LANGUAGE DisambiguateRecordFields #-}
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{-# LANGUAGE NamedFieldPuns #-}
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module VerifyCropSpanGeneration where
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import Verify.Graphics.Vty.DisplayRegion
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import Verify.Graphics.Vty.Image
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import Verify.Graphics.Vty.Picture
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import Verify.Graphics.Vty.Span
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import Graphics.Vty.Debug
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import Graphics.Vty.PictureToSpans
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import Verify
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import qualified Data.Vector as Vector
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crop_op_display_ops :: (Int -> Image -> Image) ->
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Int -> Image -> (DisplayOps, Image)
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crop_op_display_ops crop_op v i =
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let i_out = crop_op v i
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p = pic_for_image i_out
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w = MockWindow (image_width i_out) (image_height i_out)
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in (display_ops_for_pic p (region_for_window w), i_out)
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width_crop_output_columns :: (Int -> Image -> Image) ->
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SingleAttrSingleSpanStack ->
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NonNegative Int ->
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Property
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width_crop_output_columns crop_op s (NonNegative w) = stack_width s > w ==>
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let (ops, i_out) = crop_op_display_ops crop_op w (stack_image s)
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in verify_all_spans_have_width i_out ops w
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height_crop_output_columns :: (Int -> Image -> Image) ->
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SingleAttrSingleSpanStack ->
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NonNegative Int ->
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Property
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height_crop_output_columns crop_op s (NonNegative h) = stack_height s > h ==>
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let (ops, _) = crop_op_display_ops crop_op h (stack_image s)
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in display_ops_rows ops == h
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crop_right_output_columns :: SingleAttrSingleSpanStack -> NonNegative Int -> Property
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crop_right_output_columns = width_crop_output_columns crop_right
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crop_left_output_columns :: SingleAttrSingleSpanStack -> NonNegative Int -> Property
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crop_left_output_columns = width_crop_output_columns crop_left
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crop_top_output_rows :: SingleAttrSingleSpanStack -> NonNegative Int -> Property
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crop_top_output_rows = height_crop_output_columns crop_top
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crop_bottom_output_rows :: SingleAttrSingleSpanStack -> NonNegative Int -> Property
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crop_bottom_output_rows = height_crop_output_columns crop_bottom
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-- TODO: known benign failure.
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crop_right_and_left_rejoined_equivalence :: SingleAttrSingleSpanStack -> Property
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crop_right_and_left_rejoined_equivalence stack = image_width (stack_image stack) `mod` 2 == 0 ==>
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let i = stack_image stack
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-- the right part is made by cropping the image from the left.
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i_r = crop_left (image_width i `div` 2) i
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-- the left part is made by cropping the image from the right
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i_l = crop_right (image_width i `div` 2) i
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i_alt = i_l <|> i_r
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i_ops = display_ops_for_image i
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i_alt_ops = display_ops_for_image i_alt
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in verify_ops_equality i_ops i_alt_ops
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crop_top_and_bottom_rejoined_equivalence :: SingleAttrSingleSpanStack -> Property
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crop_top_and_bottom_rejoined_equivalence stack = image_height (stack_image stack) `mod` 2 == 0 ==>
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let i = stack_image stack
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-- the top part is made by cropping the image from the bottom.
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i_t = crop_bottom (image_height i `div` 2) i
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-- the bottom part is made by cropping the image from the top.
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i_b = crop_top (image_height i `div` 2) i
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i_alt = i_t <-> i_b
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in display_ops_for_image i == display_ops_for_image i_alt
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tests :: IO [Test]
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tests = return
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[ verify "cropping from the bottom produces display operations covering the expected rows"
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crop_bottom_output_rows
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, verify "cropping from the top produces display operations covering the expected rows"
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crop_top_output_rows
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, verify "cropping from the left produces display operations covering the expected columns"
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crop_left_output_columns
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, verify "cropping from the right produces display operations covering the expected columns"
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crop_right_output_columns
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-- TODO: known benign failure.
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-- , verify "the output of a stack is the same as that stack cropped left & right and joined together"
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-- crop_right_and_left_rejoined_equivalence
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, verify "the output of a stack is the same as that stack cropped top & bottom and joined together"
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crop_top_and_bottom_rejoined_equivalence
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]
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