forked from hkc/cc-stuff
74 lines
1.9 KiB
Lua
74 lines
1.9 KiB
Lua
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local colors_list = {
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colors.white,
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colors.orange,
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colors.magenta,
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colors.lightBlue,
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colors.yellow,
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colors.lime,
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colors.pink,
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colors.gray,
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colors.lightGray,
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colors.cyan,
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colors.purple,
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colors.blue,
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colors.brown,
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colors.green,
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colors.red,
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colors.black
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}
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local function load(path)
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local image = { w = 0, h = 0, scale = 1.0, palette = {}, lines = {} }
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local fp, err = io.open(path, "rb")
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if not fp then return nil, err end
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local magic = fp:read(4)
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if magic ~= "CCPI" then
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return nil, "Invalid header: expected CCPI got " .. magic
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end
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image.w, image.h = string.byte(fp:read(1)), string.byte(fp:read(1))
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for i = 1, 16 do
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image.palette[i] = bit32.lshift(string.byte(fp:read(1)), 16)
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image.palette[i] = bit32.bor(image.palette[i], bit32.lshift(string.byte(fp:read(1)), 8))
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image.palette[i] = bit32.bor(image.palette[i], string.byte(fp:read(1)))
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end
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for y = 1, image.h do
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local line = { s = "", bg = "", fg = "" }
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for x = 1, image.w do
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line.s = line.s .. fp:read(1)
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local color = string.byte(fp:read(1))
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line.bg = line.bg .. string.format("%x", bit32.band(0xF, color))
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line.fg = line.fg .. string.format("%x", bit32.band(0xF, bit32.rshift(color, 4)))
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end
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table.insert(image.lines, line)
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end
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fp:close()
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return image
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end
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local function draw(img, ox, oy, monitor)
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local t = monitor or term.current()
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ox = ox or 1
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oy = oy or 1
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for i = 1, 16 do
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t.setPaletteColor(colors_list[i], img.palette[i])
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end
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for y = 1, img.h do
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t.setCursorPos(ox, oy + y - 1)
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t.blit(img.lines[y].s, img.lines[y].fg, img.lines[y].bg)
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end
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end
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return {
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load = load,
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draw = draw
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}
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