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