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--[[ Lua Draw Text function
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2017 William Wilgus
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
]]
-- draw text onto image if width/height are supplied text is centered
if not rb.lcd_framebuffer then rb.splash(rb.HZ, "No Support!") return nil end
do
-- Internal Constants
local rocklib_image = getmetatable(rb.lcd_framebuffer())
local _LCD = rb.lcd_framebuffer()
local LCD_W, LCD_H = rb.LCD_WIDTH, rb.LCD_HEIGHT
local BSAND = 8 -- blits color to dst if src <> 0
local _NIL = nil -- nil placeholder
local _clear = rocklib_image.clear
local _copy = rocklib_image.copy
local _newimg = rb.new_image
return function(img, x, y, width, height, font, color, text)
font = font or rb.FONT_UI
local opts = {x = 0, y = 0, width = LCD_W - 1, height = LCD_H - 1,
font = font, drawmode = 3, fg_pattern = 0x1, bg_pattern = 0}
if rb.LCD_DEPTH == 2 then -- invert 2-bit screens
--vp.drawmode = bit.bxor(vp.drawmode, 4)
opts.fg_pattern = 3 - opts.fg_pattern
opts.bg_pattern = 3 - opts.bg_pattern
end
rb.set_viewport(opts)
local res, w, h = rb.font_getstringsize(text, font)
if not width then
width = 0
else
width = (width - w) / 2
end
if not height then
height = 0
else
height = (height - h) / 2
end
-- make a copy of the current screen for later
--local screen_img = _newimg(LCD_W, LCD_H)
local screen_img = _newimg(LCD_W, h * 2)
_copy(screen_img, _LCD)
-- check if the screen buffer is supplied image if so set img to the copy
if img == _LCD then
img = screen_img
end
-- we will be printing the text to the screen then blitting into img
--rb.lcd_clear_display()
_clear(_LCD, opts.bg_pattern or 0, 1, 1, LCD_W, h * 2)
if w > LCD_W then -- text is too long for the screen do it in chunks
local l = 1
local resp, wp, hp
local lenr = text:len()
while lenr > 1 do
l = lenr
resp, wp, hp = rb.font_getstringsize(text:sub(1, l), font)
while wp >= LCD_W and l > 1 do
l = l - 1
resp, wp, hp = rb.font_getstringsize(text:sub( 1, l), font)
end
rb.lcd_putsxy(0, 0, text:sub(1, l))
text = text:sub(l)
if x + width > img:width() or y + height > img:height() then
break
end
-- using the mask we made blit color into img
_copy(img, _LCD, x + width, y + height, _NIL, _NIL, _NIL, _NIL, false, BSAND, color)
x = x + wp
--rb.lcd_clear_display()
_clear(_LCD, opts.bg_pattern or 0, 1, 1, LCD_W, h * 2)
lenr = text:len()
end
else --w <= LCD_W
rb.lcd_putsxy(0, 0, text)
-- using the mask we made blit color into img
_copy(img, _LCD, x + width, y + height, _NIL, _NIL, _NIL, _NIL, false, BSAND, color)
end
_copy(_LCD, screen_img) -- restore screen
rb.set_viewport() -- set viewport default
return res, w, h
end
end
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