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add graphics pixel comparison tests

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- added an automatic check for expected vs actual with the images already shown in the report - used a 1px tolerance for now for each of the pixels checked
This commit is contained in:
ell
2023-11-16 23:28:50 +00:00
parent 37961f92d6
commit d1307584e5
6 changed files with 122 additions and 83 deletions
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testing/classes/TestMethod.lua
+49 -3
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@@ -260,11 +260,57 @@ TestMethod = {
end,
-- @method - TestMethod:exportImg()
-- @desc - used to export actual test img results to compare to the expected
-- @method - TestMethod:compareImg()
-- @desc - compares a given image to the 'expected' version, with a tolerance of
-- 1px in any direction, and then saves it as the 'actual' version for
-- report viewing
-- @param {table} imgdata - imgdata to save as a png
-- @return {nil}
exportImg = function(self, imgdata)
compareImg = function(self, imgdata)
local expected = love.image.newImageData(
'tempoutput/expected/love.test.graphics.' .. self.method .. '-' ..
tostring(self.imgs) .. '.png'
)
local iw = imgdata:getWidth()-2
local ih = imgdata:getHeight()-2
for ix=2,iw do
for iy=2,ih do
local ir, ig, ib, ia = imgdata:getPixel(ix, iy)
local tolerance = {
{expected:getPixel(ix, iy)},
{expected:getPixel(ix+1, iy+1)},
{expected:getPixel(ix+1, iy)},
{expected:getPixel(ix+1, iy-1)},
{expected:getPixel(ix, iy+1)},
{expected:getPixel(ix, iy-1)},
{expected:getPixel(ix-1, iy+1)},
{expected:getPixel(ix-1, iy)},
{expected:getPixel(ix-1, iy-1)}
}
local has_match_r = false
local has_match_g = false
local has_match_b = false
local has_match_a = false
for t=1,9 do
if ir == tolerance[t][1] then has_match_r = true; end
if ig == tolerance[t][2] then has_match_g = true; end
if ib == tolerance[t][3] then has_match_b = true; end
if ia == tolerance[t][4] then has_match_a = true; end
end
local matching = has_match_r and has_match_g and has_match_b and has_match_a
local ymatch = ''
local nmatch = ''
if has_match_r then ymatch = ymatch .. 'r' else nmatch = nmatch .. 'r' end
if has_match_g then ymatch = ymatch .. 'g' else nmatch = nmatch .. 'g' end
if has_match_b then ymatch = ymatch .. 'b' else nmatch = nmatch .. 'b' end
if has_match_a then ymatch = ymatch .. 'a' else nmatch = nmatch .. 'a' end
local pixel = tostring(ir)..','..tostring(ig)..','..tostring(ib)..','..tostring(ia)
self:assertEquals(true, matching, 'compare image pixel (' .. pixel .. ') at ' ..
tostring(ix) .. ',' .. tostring(iy) .. ', matching = ' .. ymatch ..
', not matching = ' .. nmatch .. ' (' .. self.method .. ')'
)
end
end
local path = 'tempoutput/actual/love.test.graphics.' ..
self.method .. '-' .. tostring(self.imgs) .. '.png'
imgdata:encode('png', path)