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initial project, basic reader working
This commit is contained in:
HW
186
reader.lua
Executable file
186
reader.lua
Executable file
@@ -0,0 +1,186 @@
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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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input.open("/dev/input/event0")
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input.open("/dev/input/event1")
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KEY_PAGE_UP = 109
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KEY_PAGE_DOWN = 124
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KEY_BACK = 91
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KEY_MENU = 139
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-- DPad:
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KEY_UP = 122
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KEY_DOWN = 123
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KEY_LEFT = 105
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KEY_RIGHT = 106
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KEY_BTN = 92
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if ARGV[1] == nil then
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print("needs PDF filename as first argument.")
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end
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if ARGV[2] == nil then
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ARGV[2] = ""
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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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doc = pdf.openDocument(ARGV[1], ARGV[2])
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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 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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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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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 mainloop()
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while 1 do
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local events = input.waitForEvent()
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for _, ev in ipairs(events) do
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if ev.type == 1 and (ev.value == 1 or ev.value == 2) then
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local secs, usecs = util.gettime()
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if ev.code == KEY_PAGE_DOWN 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_PAGE_UP 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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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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end
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goto(1)
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mainloop()
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