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Do not encode images with illegal colormap indexes

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Nils Dagsson Moskopp 2023-09-22 20:05:27 +02:00
parent 4dd3833f3b
commit bb68ceb38d
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2 changed files with 27 additions and 0 deletions
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15
examples.lua
View File

@ -164,3 +164,18 @@ local pixels = {
{ _, _, _, K, _, _, _ },
}
tga_encoder.image(pixels):save("colormapped_B8G8R8A8.tga", {colormap=colormap})
-- encoding a colormapped image with illegal colormap indexes should error out
local colormap = {
{ 0, 0, 0, 0 },
{ 0, 0, 0, 255 },
}
local status, message = pcall(
function ()
tga_encoder.image(pixels):encode({colormap=colormap})
end
)
assert(
false == status and
"init.lua:36: colormap index 2 not in colormap of size 2" == message
)

12
init.lua
View File

@ -28,6 +28,18 @@ function image:encode_colormap_spec(properties)
colormap_pixel_depth = pixel_depth_by_color_format[
properties.color_format
]
-- ensure that each pixel references a legal colormap entry
for _, row in ipairs(self.pixels) do
for _, pixel in ipairs(row) do
local colormap_index = pixel[1]
if colormap_index >= #colormap then
error(
"colormap index " .. colormap_index ..
" not in colormap of size " .. #colormap
)
end
end
end
end
local colormap_spec =
string.char(0, 0) .. -- first entry index