mirror of
https://github.com/kepler155c/opus
synced 2024-11-16 05:34:49 +00:00
415 lines
9.1 KiB
Lua
415 lines
9.1 KiB
Lua
local class = require('class')
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local Region = require('ui.region')
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local Util = require('util')
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local _rep = string.rep
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local _sub = string.sub
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local _gsub = string.gsub
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local colors = _G.colors
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local Canvas = class()
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Canvas.colorPalette = { }
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Canvas.darkPalette = { }
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Canvas.grayscalePalette = { }
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for n = 1, 16 do
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Canvas.colorPalette[2 ^ (n - 1)] = _sub("0123456789abcdef", n, n)
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Canvas.grayscalePalette[2 ^ (n - 1)] = _sub("088888878877787f", n, n)
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Canvas.darkPalette[2 ^ (n - 1)] = _sub("8777777f77fff77f", n, n)
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end
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--[[
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A canvas can have more lines than canvas.height in order to scroll
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]]
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function Canvas:init(args)
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self.x = 1
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self.y = 1
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self.layers = { }
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Util.merge(self, args)
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self.ex = self.x + self.width - 1
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self.ey = self.y + self.height - 1
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if not self.palette then
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if self.isColor then
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self.palette = Canvas.colorPalette
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else
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self.palette = Canvas.grayscalePalette
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end
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end
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self.lines = { }
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for i = 1, self.height do
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self.lines[i] = { }
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end
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end
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function Canvas:move(x, y)
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self.x, self.y = x, y
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self.ex = self.x + self.width - 1
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self.ey = self.y + self.height - 1
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end
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function Canvas:resize(w, h)
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for i = #self.lines, h do
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self.lines[i] = { }
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self:clearLine(i)
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end
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while #self.lines > h do
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table.remove(self.lines, #self.lines)
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end
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if w < self.width then
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for i = 1, h do
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self.lines[i].text = _sub(self.lines[i].text, 1, w)
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self.lines[i].fg = _sub(self.lines[i].fg, 1, w)
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self.lines[i].bg = _sub(self.lines[i].bg, 1, w)
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end
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elseif w > self.width then
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local d = w - self.width
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local text = _rep(' ', d)
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local fg = _rep(self.palette[self.fg or colors.white], d)
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local bg = _rep(self.palette[self.bg or colors.black], d)
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for i = 1, h do
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self.lines[i].text = self.lines[i].text .. text
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self.lines[i].fg = self.lines[i].fg .. fg
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self.lines[i].bg = self.lines[i].bg .. bg
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end
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end
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self.ex = self.x + w - 1
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self.ey = self.y + h - 1
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self.width = w
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self.height = h
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end
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function Canvas:copy()
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local b = Canvas({
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x = self.x,
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y = self.y,
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width = self.width,
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height = self.height,
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isColor = self.isColor,
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})
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for i = 1, #self.lines do
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b.lines[i].text = self.lines[i].text
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b.lines[i].fg = self.lines[i].fg
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b.lines[i].bg = self.lines[i].bg
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end
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return b
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end
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function Canvas:addLayer(layer)
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local canvas = Canvas({
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x = layer.x,
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y = layer.y,
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width = layer.width,
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height = layer.height,
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isColor = self.isColor,
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})
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canvas.parent = self
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table.insert(self.layers, canvas)
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return canvas
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end
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function Canvas:removeLayer()
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for k, layer in pairs(self.parent.layers) do
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if layer == self then
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self:setVisible(false)
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table.remove(self.parent.layers, k)
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break
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end
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end
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end
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function Canvas:setVisible(visible)
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self.visible = visible
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if not visible and self.parent then
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self.parent:dirty()
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-- TODO: set parent's lines to dirty for each line in self
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end
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end
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-- Push a layer to the top
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function Canvas:raise()
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if self.parent then
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local layers = self.parent.layers or { }
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for k, v in pairs(layers) do
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if v == self then
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table.insert(layers, table.remove(layers, k))
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break
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end
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end
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end
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end
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function Canvas:write(x, y, text, bg, fg)
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if bg then
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bg = _rep(self.palette[bg], #text)
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end
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if fg then
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fg = _rep(self.palette[fg], #text)
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end
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self:blit(x, y, text, bg, fg)
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end
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function Canvas:blit(x, y, text, bg, fg)
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if y > 0 and y <= #self.lines and x <= self.width then
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local width = #text
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-- fix ffs
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if x < 1 then
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text = _sub(text, 2 - x)
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if bg then
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bg = _sub(bg, 2 - x)
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end
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if fg then
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fg = _sub(fg, 2 - x)
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end
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width = width + x - 1
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x = 1
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end
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if x + width - 1 > self.width then
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text = _sub(text, 1, self.width - x + 1)
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if bg then
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bg = _sub(bg, 1, self.width - x + 1)
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end
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if fg then
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fg = _sub(fg, 1, self.width - x + 1)
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end
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width = #text
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end
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if width > 0 then
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local function replace(sstr, pos, rstr)
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if pos == 1 and width == self.width then
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return rstr
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elseif pos == 1 then
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return rstr .. _sub(sstr, pos+width)
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elseif pos + width > self.width then
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return _sub(sstr, 1, pos-1) .. rstr
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end
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return _sub(sstr, 1, pos-1) .. rstr .. _sub(sstr, pos+width)
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end
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local line = self.lines[y]
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if line then
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line.dirty = true
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line.text = replace(line.text, x, text, width)
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if fg then
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line.fg = replace(line.fg, x, fg, width)
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end
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if bg then
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line.bg = replace(line.bg, x, bg, width)
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end
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end
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end
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end
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end
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function Canvas:writeLine(y, text, fg, bg)
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if y > 0 and y <= #self.lines then
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self.lines[y].dirty = true
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self.lines[y].text = text
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self.lines[y].fg = fg
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self.lines[y].bg = bg
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end
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end
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function Canvas:clearLine(y, bg, fg)
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fg = _rep(self.palette[fg or colors.white], self.width)
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bg = _rep(self.palette[bg or colors.black], self.width)
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self:writeLine(y, _rep(' ', self.width), fg, bg)
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end
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function Canvas:clear(bg, fg)
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local text = _rep(' ', self.width)
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fg = _rep(self.palette[fg or colors.white], self.width)
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bg = _rep(self.palette[bg or colors.black], self.width)
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for i = 1, #self.lines do
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self:writeLine(i, text, fg, bg)
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end
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end
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function Canvas:isDirty()
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for i = 1, #self.lines do
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if self.lines[i].dirty then
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return true
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end
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end
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end
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function Canvas:dirty()
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for i = 1, #self.lines do
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self.lines[i].dirty = true
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end
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if self.layers then
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for _, canvas in pairs(self.layers) do
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canvas:dirty()
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end
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end
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end
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function Canvas:clean()
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for i = 1, #self.lines do
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self.lines[i].dirty = nil
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end
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end
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function Canvas:applyPalette(palette)
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local lookup = { }
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for n = 1, 16 do
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lookup[self.palette[2 ^ (n - 1)]] = palette[2 ^ (n - 1)]
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end
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for _, l in pairs(self.lines) do
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l.fg = _gsub(l.fg, '%w', lookup)
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l.bg = _gsub(l.bg, '%w', lookup)
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l.dirty = true
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end
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self.palette = palette
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end
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function Canvas:render(device)
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local offset = { x = 0, y = 0 }
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local parent = self.parent
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while parent do
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offset.x = offset.x + parent.x - 1
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offset.y = offset.y + parent.y - 1
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parent = parent.parent
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end
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if #self.layers > 0 then
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self:__renderLayers(device, offset)
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else
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self:__blitRect(device, nil, {
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x = self.x + offset.x,
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y = self.y + offset.y
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})
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self:clean()
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end
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end
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-- regions are comprised of absolute values that coorespond to the output device.
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-- canvases have coordinates relative to their parent.
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-- canvas layer's stacking order is determined by the position within the array.
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-- layers in the beginning of the array are overlayed by layers further down in
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-- the array.
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function Canvas:__renderLayers(device, offset)
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if #self.layers > 0 then
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self.regions = self.regions or Region.new(self.x, self.y, self.ex, self.ey)
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for i = 1, #self.layers do
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local canvas = self.layers[i]
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if canvas.visible then
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-- punch out this area from the parent's canvas
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self:__punch(canvas, offset)
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-- get the area to render for this layer
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canvas.regions = Region.new(
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canvas.x + offset.x,
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canvas.y + offset.y,
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canvas.ex + offset.x,
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canvas.ey + offset.y)
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-- punch out any layers that overlap this one
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for j = i + 1, #self.layers do
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if self.layers[j].visible then
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canvas:__punch(self.layers[j], offset)
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end
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end
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if #canvas.regions.region > 0 then
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canvas:__renderLayers(device, {
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x = canvas.x + offset.x - 1,
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y = canvas.y + offset.y - 1,
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})
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end
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canvas.regions = nil
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end
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end
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self:__blitClipped(device, offset)
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self.regions = nil
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elseif self.regions and #self.regions.region > 0 then
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self:__blitClipped(device, offset)
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self.regions = nil
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else
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self:__blitRect(device, nil, {
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x = self.x + offset.x,
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y = self.y + offset.y
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})
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self.regions = nil
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end
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self:clean()
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end
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function Canvas:__blitClipped(device, offset)
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for _,region in ipairs(self.regions.region) do
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self:__blitRect(device,
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{ x = region[1] - offset.x,
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y = region[2] - offset.y,
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ex = region[3] - offset.x,
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ey = region[4] - offset.y},
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{ x = region[1], y = region[2] })
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end
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end
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function Canvas:__punch(rect, offset)
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self.regions:subRect(
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rect.x + offset.x,
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rect.y + offset.y,
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rect.ex + offset.x,
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rect.ey + offset.y)
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end
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function Canvas:__blitRect(device, src, tgt)
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src = src or { x = 1, y = 1, ex = self.ex - self.x + 1, ey = self.ey - self.y + 1 }
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tgt = tgt or self
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--[[
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-- for visualizing updates on the screen
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local drew
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for i = 0, src.ey - src.y do
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local line = self.lines[src.y + i + (self.offy or 0)]
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if line and line.dirty then
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drew = true
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local t, fg, bg = line.text, line.fg, line.bg
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if src.x > 1 or src.ex < self.ex then
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t = _sub(t, src.x, src.ex)
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fg = _rep(1, src.ex-src.x + 1)
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bg = _rep(2, src.ex-src.x + 1)
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end
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device.setCursorPos(tgt.x, tgt.y + i)
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device.blit(t, fg, bg)
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end
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end
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if drew then
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os.sleep(.3)
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end
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]]
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for i = 0, src.ey - src.y do
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local line = self.lines[src.y + i + (self.offy or 0)]
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if line and line.dirty then
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local t, fg, bg = line.text, line.fg, line.bg
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if src.x > 1 or src.ex < self.ex then
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t = _sub(t, src.x, src.ex)
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fg = _sub(fg, src.x, src.ex)
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bg = _sub(bg, src.x, src.ex)
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end
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device.setCursorPos(tgt.x, tgt.y + i)
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device.blit(t, fg, bg)
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end
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end
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end
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return Canvas
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