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Measure pixel_depth in bits everywhere

This commit is contained in:
Nils Dagsson Moskopp 2022-05-16 01:54:21 +02:00
parent 36ee45ebe3
commit fa23775bf9
Signed by untrusted user who does not match committer: erlehmann
GPG Key ID: A3BC671C35191080
1 changed files with 10 additions and 10 deletions
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20
init.lua
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@ -69,12 +69,12 @@ function image:encode_data(properties)
local colors = properties.colors
local compression = properties.compression
local pixel_depth = properties.pixel_depth
self.pixel_depth = #self.pixels[1][1]
self.pixel_depth = #self.pixels[1][1] * 8
if "BW" == colors and "RAW" == compression and 8 == pixel_depth then
if 1 == self.pixel_depth then
if 8 == self.pixel_depth then
self:encode_data_bw8_to_bw8_raw()
elseif 3 == self.pixel_depth then
elseif 24 == self.pixel_depth then
self:encode_data_r8g8b8_to_bw8_raw()
end
elseif "RGB" == colors and 16 == pixel_depth then
@ -97,7 +97,7 @@ function image:encode_data(properties)
end
function image:encode_data_bw8_to_bw8_raw()
assert(1 == self.pixel_depth)
assert(8 == self.pixel_depth)
local raw_pixels = {}
for _, row in ipairs(self.pixels) do
for _, pixel in ipairs(row) do
@ -109,7 +109,7 @@ function image:encode_data_bw8_to_bw8_raw()
end
function image:encode_data_r8g8b8_to_bw8_raw()
assert(3 == self.pixel_depth)
assert(24 == self.pixel_depth)
local raw_pixels = {}
for _, row in ipairs(self.pixels) do
for _, pixel in ipairs(row) do
@ -131,7 +131,7 @@ function image:encode_data_r8g8b8_to_bw8_raw()
end
function image:encode_data_a1r5g5b5_raw()
assert(3 == self.pixel_depth)
assert(24 == self.pixel_depth)
local raw_pixels = {}
-- Sample depth rescaling is done according to the algorithm presented in:
-- <https://www.w3.org/TR/2003/REC-PNG-20031110/#13Sample-depth-rescaling>
@ -151,7 +151,7 @@ function image:encode_data_a1r5g5b5_raw()
end
function image:encode_data_a1r5g5b5_rle()
assert(3 == self.pixel_depth)
assert(24 == self.pixel_depth)
local colorword = nil
local previous_r = nil
local previous_g = nil
@ -241,7 +241,7 @@ function image:encode_data_a1r5g5b5_rle()
end
function image:encode_data_r8g8b8_raw()
assert(3 == self.pixel_depth)
assert(24 == self.pixel_depth)
local raw_pixels = {}
for _, row in ipairs(self.pixels) do
for _, pixel in ipairs(row) do
@ -253,7 +253,7 @@ function image:encode_data_r8g8b8_raw()
end
function image:encode_data_r8g8b8_rle()
assert(3 == self.pixel_depth)
assert(24 == self.pixel_depth)
local previous_r = nil
local previous_g = nil
local previous_b = nil
@ -330,7 +330,7 @@ function image:encode_data_r8g8b8_rle()
end
function image:encode_data_r8g8b8a8_raw()
assert(4 == self.pixel_depth)
assert(32 == self.pixel_depth)
local raw_pixels = {}
for _, row in ipairs(self.pixels) do
for _, pixel in ipairs(row) do