247 lines
6.5 KiB
Lua
247 lines
6.5 KiB
Lua
--[[
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Copyright (c) 2005-2006, Niels Martin Hansen, Rodrigo Braz Monteiro
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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* Neither the name of the Aegisub Group nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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]]
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-- Make a shallow copy of a table
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function table.copy(oldtab)
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local newtab = {}
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for key, val in pairs(oldtab) do
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newtab[key] = val
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end
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return newtab
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end
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-- Compability
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copy_line = table.copy
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-- Make a deep copy of a table
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-- This will do infinite recursion if there's any circular references. (Eg. if you try to copy _G)
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function table.copy_deep(srctab)
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-- Table to hold subtables already copied, to avoid circular references causing infinite recursion
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local circular = {}
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local function do_copy(oldtab)
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local newtab = {}
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for key, val in pairs(newtab) do
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if type(val) == "table" then
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if not circular[val] then
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circular[val] = do_copy(val)
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end
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newtab[key] = circular[val]
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else
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newtab[key] = val
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end
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end
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end
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return do_copy(srctab)
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end
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-- Generates ASS hexadecimal string from R,G,B integer components, in &HBBGGRR& format
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function ass_color(r,g,b)
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return string.format("&H%02X%02X%02X&",b,g,r)
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end
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-- Format an alpha-string for \Xa style overrides
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function ass_alpha(a)
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return string.format("&H%02X&", a)
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end
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-- Format an ABGR string for use in style definitions (these don't end with & either)
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function ass_style_color(r,g,b,a)
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return string.format("&H%02X%02X%02X%02X",a,b,g,r)
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end
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-- Extract colour components of an ASS colour
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function extract_color(s)
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local a, b, g, r
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-- Try a style first
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a, b, g, r = s:match("&H(%x%x)(%x%x)(%x%x)(%x%x)")
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if a then
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return tonumber(r, 16), tonumber(g, 16), tonumber(b, 16), tonumber(a, 16)
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end
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-- Then a colour override
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b, g, r = s:match("&H(%x%x)(%x%x)(%x%x)&")
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if b then
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return tonumber(r, 16), tonumber(g, 16), tonumber(b, 16), 0
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end
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-- Then an alpha override
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a = s:match("&H(%x%x)&")
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if a then
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return 0, 0, 0, tonumber(a, 16)
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end
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-- Ok how about HTML format then?
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r, g, b, a = s:match("#(%x%x)(%x%x)?(%x%x)?(%x%x)?")
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if r then
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return tonumber(r or 0, 16), tonumber(g or 0, 16), tonumber(b or 0, 16), tonumber(a or 0, 16)
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end
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-- Failed...
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return nil
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end
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-- Create an alpha override code from a style definition colour code
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function alpha_from_style(scolor)
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local r, g, b, a = extract_color(scolor)
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return ass_alpha(a or 0)
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end
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-- Create an colour override code from a style definition colour code
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function color_from_style(scolor)
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local r, g, b = extract_color(scolor)
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return ass_color(r or 0, g or 0, b or 0)
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end
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-- Converts HSV (Hue, Saturation, Value) to RGB
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function HSV_to_RGB(H,S,V)
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local r,g,b = 0,0,0
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-- Saturation is zero, make grey
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if S == 0 then
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r = V*255
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if r < 0 then
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r = 0
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end
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if r > 255 then
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r = 255
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end
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g = r
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b = r
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-- Else, calculate color
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else
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-- Calculate subvalues
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H = H % 360 -- Put H in range [0,360)
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local Hi = math.floor(H/60)
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local f = H/60.0 - Hi
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local p = V*(1-S)
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local q = V*(1-f*S)
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local t = V*(1-(1-f)*S)
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-- Do math based on hue index
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if Hi == 0 then
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r = V*255.0
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g = t*255.0
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b = p*255.0
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elseif Hi == 1 then
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r = q*255.0
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g = V*255.0
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b = p*255.0
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elseif Hi == 2 then
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r = p*255.0
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g = V*255.0
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b = t*255.0
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elseif Hi == 3 then
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r = p*255.0
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g = q*255.0
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b = V*255.0
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elseif Hi == 4 then
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r = t*255.0
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g = p*255.0
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b = V*255.0
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elseif Hi == 5 then
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r = V*255.0
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g = p*255.0
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b = q*255.0
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else
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aegisub.debug.out(2, "RGB_to_HSV: Hi got an unexpected value: %d\n\n", Hi)
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end
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end
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r = math.floor(r)
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g = math.floor(g)
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b = math.floor(b)
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return r,g,b
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end
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-- Removes spaces at the start and end of string
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function string.trim(s)
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return (string.gsub(s, "^%s*(.-)%s*$", "%1"))
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end
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-- Get the "head" and "tail" of a string, treating it as a sequence of words separated by one or more space-characters
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function string.headtail(s)
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local a, b, head, tail = string.find(s, "(.-)%s+(.*)")
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if a then
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return head, tail
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else
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return s, ""
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end
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end
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-- Iterator function for headtail
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function string.words(s)
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local t = s
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local function wordloop()
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if t == "" then
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return nil
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end
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local head, tail = string.headtail(t)
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t = tail
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return head
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end
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return wordloop, nil, nil
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end
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-- Clamp a number value to a range
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function clamp(val, min, max)
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if val < min then
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return min
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elseif val > max then
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return max
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else
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return val
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end
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end
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-- Interpolate between two numbers
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function interpolate(pct, min, max)
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if pct <= 0 then
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return min
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elseif pct >= 1 then
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return max
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else
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return pct * (max - min) + min
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end
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end
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-- Interpolate between two colour values, given in either style definition or style override format
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-- Return in style override format
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function interpolate_color(pct, first, last)
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local r1, g1, b1 = extract_color(first)
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local r2, g2, b2 = extract_color(last)
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local r, g, b = interpolate(pct, r1, r2), interpolate(pct, g1, g2), interpolate(pct, b1, b2)
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return ass_color(r, g, b)
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end
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-- Interpolate between two alpha values, given either in style override or as part as a style definition colour
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-- Return in style override format
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function interpolate_alpha(pct, first, last)
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local r1, g1, b1, a1 = extract_color(first)
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local r2, g2, b2, a2 = extract_color(last)
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return ass_alpha(interpolate(pct, a1, a2))
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end
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