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Add example code to generate TGA logo 

The tiny logo is a 12×12 TGA image.
The huge logo is a 1200×1200 TGA image.
This commit is contained in:
Nils Dagsson Moskopp 2023-08-27 15:10:31 +02:00
parent e9862f5f24
commit 5bf0e79c6f
Signed by untrusted user who does not match committer: erle
GPG Key ID: A3BC671C35191080
1 changed files with 51 additions and 0 deletions
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dofile("init.lua")
local colormap = {
{ 0, 0, 0 }, -- black
{ 255, 255, 255 }, -- white
{ 255, 0, 0 }, -- red
{ 0, 255, 0 }, -- green
{ 0, 0, 255 }, -- blue
}
local _ = { 0 }
local W = { 1 }
local R = { 2 }
local G = { 3 }
local B = { 4 }
local pixels_tiny = {
{ W, W, W, W, W, W, W, W, W, W, W, W, },
{ W, _, _, _, _, _, _, _, _, _, _, W, },
{ W, _, _, _, _, _, _, B, _, B, _, W, },
{ W, _, _, _, _, _, _, B, B, B, _, W, },
{ W, _, _, _, G, G, G, B, _, B, _, W, },
{ W, _, _, _, G, _, G, B, B, B, _, W, },
{ W, _, _, R, G, _, _, _, _, _, _, W, },
{ W, _, _, R, G, G, G, _, _, _, _, W, },
{ W, _, _, R, _, _, _, _, _, _, _, W, },
{ W, _, R, R, R, _, _, _, _, _, _, W, },
{ W, _, _, _, _, _, _, _, _, _, _, W, },
{ W, W, W, W, W, W, W, W, W, W, W, W, },
}
local pixels_huge = {}
local size_tiny = #pixels_tiny
local size_huge = 1200
local scale = size_huge / size_tiny
for x_huge = 1,size_huge,1 do
local x_tiny = math.ceil( x_huge / scale )
for z_huge = 1,size_huge,1 do
local z_tiny = math.ceil( z_huge / scale )
if nil == pixels_huge[z_huge] then
pixels_huge[z_huge] = {}
end
pixels_huge[z_huge][x_huge] = pixels_tiny[z_tiny][x_tiny]
end
end
tga_encoder.image(pixels_tiny):save("logo_tiny.tga", {colormap=colormap})
tga_encoder.image(pixels_huge):save("logo_huge.tga", {colormap=colormap})