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#!./kpdfview
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--[[
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KindlePDFViewer: a reader implementation
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Copyright (C) 2011 Hans-Werner Hilse <hilse@web.de>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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]]--
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require "alt_getopt"
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KEY_PAGEUP = 109 -- nonstandard
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KEY_PAGEDOWN = 124 -- nonstandard
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KEY_BACK = 91 -- nonstandard
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KEY_MENU = 139
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-- DPad:
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KEY_UP = 122 -- nonstandard
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KEY_DOWN = 123 -- nonstandard
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KEY_LEFT = 105
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KEY_RIGHT = 106
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KEY_BTN = 92 -- nonstandard
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-- constants from <linux/input.h>
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EV_KEY = 1
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-- event values
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EVENT_VALUE_KEY_PRESS = 1
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EVENT_VALUE_KEY_REPEAT = 2
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EVENT_VALUE_KEY_RELEASE = 0
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-- option parsing:
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longopts = {
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password = "p",
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goto = "g",
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gamma = "G",
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device = "d",
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help = "h"
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}
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optarg, optind = alt_getopt.get_opts(ARGV, "p:G:hg:d:", longopts)
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if optarg["h"] or ARGV[optind] == nil then
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print("usage: ./reader.lua [OPTION] ... DOCUMENT.PDF")
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print("Read PDFs on your E-Ink reader")
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print("")
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print("-p, --password=PASSWORD set password for reading PDF document")
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print("-g, --goto=page start reading on page")
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print("-G, --gamma=GAMMA set gamma correction")
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print(" (floating point notation, e.g. \"1.5\")")
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print("-d, --device=DEVICE set device specific configuration,")
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print(" currently one of \"kdxg\" (default), \"k3\"")
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print("-h, --help show this usage help")
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print("")
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print("This software is licensed under the GPLv3.")
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print("See http://github.com/hwhw/kindlepdfviewer for more info.")
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return
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end
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rcount = 5
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rcountmax = 5
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globalzoom = -1
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if optarg["d"] == "k3" then
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-- for now, the only difference is the additional input device
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input.open("/dev/input/event0")
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input.open("/dev/input/event1")
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input.open("/dev/input/event2")
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elseif optarg["d"] == "emu" then
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input.open("")
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-- SDL key codes
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KEY_PAGEDOWN = 112
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KEY_PAGEUP = 117
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KEY_BACK = 22 -- backspace
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KEY_MENU = 67 -- F1
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KEY_UP = 111
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KEY_DOWN = 116
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KEY_LEFT = 113
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KEY_RIGHT = 114
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KEY_BTN = 36 -- enter for now
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else
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input.open("/dev/input/event0")
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input.open("/dev/input/event1")
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end
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doc = pdf.openDocument(ARGV[optind], optarg["p"] or "")
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print("pdf has "..doc:getPages().." pages.")
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fb = einkfb.open("/dev/fb0")
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width, height = fb:getSize()
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nulldc = pdf.newDC()
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cache = {
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{ age = 0, no = 0, bb = blitbuffer.new(width, height), dc = pdf.newDC(), page = nil },
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{ age = 0, no = 0, bb = blitbuffer.new(width, height), dc = pdf.newDC(), page = nil },
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{ age = 0, no = 0, bb = blitbuffer.new(width, height), dc = pdf.newDC(), page = nil }
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}
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function freecache()
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for i = 1, #cache do
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if cache[i].page ~= nil then
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print("freeing slot="..i.." oldpage="..cache[i].no)
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cache[i].page:close()
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cache[i].page = nil
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end
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end
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end
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function checkcache(no)
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for i = 1, #cache do
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if cache[i].no == no and cache[i].page ~= nil then
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print("cache hit: slot="..i.." page="..no)
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return i
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end
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end
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print("cache miss")
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return nil
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end
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function cacheslot()
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freeslot = nil
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while freeslot == nil do
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for i = 1, #cache do
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if cache[i].age > 0 then
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print("aging slot="..i)
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cache[i].age = cache[i].age - 1
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else
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if cache[i].page ~= nil then
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print("freeing slot="..i.." oldpage="..cache[i].no)
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cache[i].page:close()
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cache[i].page = nil
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end
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freeslot = i
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end
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end
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end
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print("returning free slot="..freeslot)
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return freeslot
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end
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function draworcache(no)
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local slot = checkcache(no)
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if slot == nil then
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slot = cacheslot()
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cache[slot].no = no
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cache[slot].age = #cache
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cache[slot].page = doc:openPage(no)
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setzoom(slot)
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print("drawing page="..no.." to slot="..slot)
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cache[slot].page:draw(cache[slot].dc, cache[slot].bb, 0, 0)
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end
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return slot
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end
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function setzoom(cacheslot)
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local pwidth, pheight = cache[cacheslot].page:getSize(nulldc)
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-- default zoom: fit to page
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local zoom = width / pwidth
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local offset_x = 0
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local offset_y = (height - (zoom * pheight)) / 2
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if height / pheight < zoom then
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zoom = height / pheight
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offset_x = (width - (zoom * pwidth)) / 2
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offset_y = 0
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end
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cache[cacheslot].dc:setZoom(zoom)
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cache[cacheslot].dc:setOffset(offset_x, offset_y)
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-- set gamma here, we don't have any other good place for this right now:
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if optarg["G"] then
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print("gamma correction: "..optarg["G"])
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cache[cacheslot].dc:setGamma(optarg["G"])
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end
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end
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function show(no)
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local slot = draworcache(no)
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fb:blitFullFrom(cache[slot].bb)
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if rcount == rcountmax then
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print("full refresh")
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rcount = 1
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fb:refresh(0)
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else
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print("partial refresh")
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rcount = rcount + 1
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fb:refresh(1)
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end
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slot_visible = slot;
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end
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function goto(no)
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if no < 1 or no > doc:getPages() then
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return
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end
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pageno = no
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show(no)
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if no < doc:getPages() then
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-- always pre-cache next page
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draworcache(no+1)
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end
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end
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function modify_gamma(offset)
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local slot = slot_visible
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local gamma = cache[slot].dc:getGamma();
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if gamma == -1 then
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gamma = 1
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end
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local no = cache[slot].no
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print("modify_gamma "..no.." slot="..slot.." gamma="..gamma.." offset="..offset)
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gamma = gamma + offset;
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optarg["G"] = gamma; -- for next page
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freecache()
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goto(no)
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end
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function mainloop()
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while 1 do
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local ev = input.waitForEvent()
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if ev.type == EV_KEY and ev.value == EVENT_VALUE_KEY_PRESS then
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local secs, usecs = util.gettime()
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if ev.code == KEY_PAGEUP then
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print(cache)
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goto(pageno + 1)
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print(cache)
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elseif ev.code == KEY_PAGEDOWN then
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print(cache)
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goto(pageno - 1)
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print(cache)
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elseif ev.code == KEY_BACK then
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return
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elseif ev.code == KEY_UP then
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modify_gamma( 0.2 )
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elseif ev.code == KEY_DOWN then
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modify_gamma( -0.2 )
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end
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local nsecs, nusecs = util.gettime()
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local dur = (nsecs - secs) * 1000000 + nusecs - usecs
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print("E: T="..ev.type.." V="..ev.value.." C="..ev.code.." DUR="..dur)
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end
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end
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end
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goto(tonumber(optarg["g"]) or 1)
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mainloop()
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