mirror of https://github.com/koreader/koreader
major overhaul of the code structure, more OO like
HW
13 years ago
parent
f93538256a
commit
affc3b231a
@ -0,0 +1,7 @@
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blitbuffer.paintBorder = function (bb, x, y, w, h, bw, c)
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bb:paintRect(x, y, w, bw, c)
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bb:paintRect(x, y+h-bw, w, bw, c)
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bb:paintRect(x, y+bw, bw, h - 2*bw, c)
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bb:paintRect(x+w-bw, y+bw, bw, h - 2*bw, c)
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end
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@ -0,0 +1,359 @@
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require "keys"
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require "settings"
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PDFReader = {
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-- "constants":
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ZOOM_BY_VALUE = 0,
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ZOOM_FIT_TO_PAGE = -1,
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ZOOM_FIT_TO_PAGE_WIDTH = -2,
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ZOOM_FIT_TO_PAGE_HEIGHT = -3,
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ZOOM_FIT_TO_CONTENT = -4,
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ZOOM_FIT_TO_CONTENT_WIDTH = -5,
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ZOOM_FIT_TO_CONTENT_HEIGHT = -6,
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GAMMA_NO_GAMMA = 1.0,
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-- framebuffer update policy state:
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rcount = 5,
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rcountmax = 5,
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-- zoom state:
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globalzoom = 1.0,
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globalzoommode = -1, -- ZOOM_FIT_TO_PAGE
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-- gamma setting:
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globalgamma = 1.0, -- GAMMA_NO_GAMMA
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-- size of current page for current zoom level in pixels
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fullwidth = 0,
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fullheight = 0,
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offset_x = 0,
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offset_y = 0,
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-- set panning distance
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shift_x = 100,
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shift_y = 50,
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pan_by_page = false, -- using shift_[xy] or width/height
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-- keep track of input state:
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shiftmode = false, -- shift pressed
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altmode = false, -- alt pressed
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-- the pdf document:
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doc = nil,
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-- the document's setting store:
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settings = nil,
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-- we will use this one often, so keep it "static":
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nulldc = pdf.newDC(),
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-- tile cache configuration:
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cache_max_memsize = 1024*1024*5, -- 5MB tile cache
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cache_item_max_pixels = 1024*1024*2, -- max. size of rendered tiles
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cache_max_ttl = 20, -- time to live
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-- tile cache state:
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cache_current_memsize = 0,
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cache = {},
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}
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-- guarantee that we have enough memory in cache
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function PDFReader:cacheclaim(size)
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if(size > self.cache_max_memsize) then
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-- we're not allowed to claim this much at all
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error("too much memory claimed")
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return false
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end
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while self.cache_current_memsize + size > self.cache_max_memsize do
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-- repeat this until we have enough free memory
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for k, _ in pairs(self.cache) do
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if self.cache[k].ttl > 0 then
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-- reduce ttl
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self.cache[k].ttl = self.cache[k].ttl - 1
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else
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-- cache slot is at end of life, so kick it out
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self.cache_current_memsize = self.cache_current_memsize - self.cache[k].size
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self.cache[k] = nil
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end
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end
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end
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self.cache_current_memsize = self.cache_current_memsize + size
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return true
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end
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function PDFReader:draworcache(no, zoom, offset_x, offset_y, width, height, gamma)
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-- hash draw state
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local hash = self:cachehash(no, zoom, offset_x, offset_y, width, height, gamma)
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if self.cache[hash] == nil then
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-- not in cache, so prepare cache slot...
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self:cacheclaim(width * height / 2);
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self.cache[hash] = {
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ttl = self.cache_max_ttl,
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size = width * height / 2,
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bb = Blitbuffer.new(width, height)
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}
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-- and draw the page
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local page = self.doc:openPage(no)
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local dc = self:setzoom(page, hash)
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page:draw(dc, self.cache[hash].bb, 0, 0)
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page:close()
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else
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-- we have the page in our cache,
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-- so give it more ttl.
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self.cache[hash].ttl = self.cache_max_ttl
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end
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return hash
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end
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-- calculate a hash for our current state
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function PDFReader:cachehash(no, zoom, offset_x, offset_y, width, height, gamma)
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-- TODO (?): make this a "real" hash...
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return no..'_'..zoom..'_'..offset_x..','..offset_y..'-'..width..'x'..height..'_'..gamma;
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end
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-- blank the cache
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function PDFReader:clearcache()
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self.cache = {}
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end
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-- open a PDF file and its settings store
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function PDFReader:open(filename, password)
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if self.doc ~= nil then
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self.doc:close()
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end
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if self.settings ~= nil then
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self.settings:close()
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end
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self.doc = pdf.openDocument(filename, password or "")
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if self.doc ~= nil then
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self.settings = DocSettings:open(filename)
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self:clearcache()
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end
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end
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-- set viewer state according to zoom state
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function PDFReader:setzoom(page)
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local dc = pdf.newDC()
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local pwidth, pheight = page:getSize(self.nulldc)
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if self.globalzoommode == self.ZOOM_FIT_TO_PAGE then
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self.globalzoom = width / pwidth ----------
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self.offset_x = 0
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self.offset_y = (height - (self.globalzoom * pheight)) / 2
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if height / pheight < self.globalzoom then
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self.globalzoom = height / pheight
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self.offset_x = (width - (self.globalzoom * pwidth)) / 2
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self.offset_y = 0
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end
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elseif self.globalzoommode == self.ZOOM_FIT_TO_PAGE_WIDTH then
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self.globalzoom = width / pwidth
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self.offset_x = 0
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self.offset_y = (height - (globalzoom * pheight)) / 2
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elseif self.globalzoommode == self.ZOOM_FIT_TO_PAGE_HEIGHT then
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self.globalzoom = height / pheight
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self.offset_x = (width - (self.globalzoom * pwidth)) / 2
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self.offset_y = 0
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elseif self.globalzoommode == self.ZOOM_FIT_TO_CONTENT then
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local x0, y0, x1, y1 = page:getUsedBBox()
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self.globalzoom = width / (x1 - x0)
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self.offset_x = -1 * x0 * globalzoom
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self.offset_y = -1 * y0 * self.globalzoom + (height - (self.globalzoom * (y1 - y0))) / 2
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if height / (y1 - y0) < self.globalzoom then
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self.globalzoom = height / (y1 - y0)
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self.offset_x = -1 * x0 * self.globalzoom + (width - (self.globalzoom * (x1 - x0))) / 2
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self.offset_y = -1 * y0 * self.globalzoom
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end
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elseif self.globalzoommode == self.ZOOM_FIT_TO_CONTENT_WIDTH then
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local x0, y0, x1, y1 = page:getUsedBBox()
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self.globalzoom = width / (x1 - x0)
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self.offset_x = -1 * x0 * self.globalzoom
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self.offset_y = -1 * y0 * self.globalzoom + (height - (self.globalzoom * (y1 - y0))) / 2
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elseif self.globalzoommode == self.ZOOM_FIT_TO_CONTENT_HEIGHT then
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local x0, y0, x1, y1 = page:getUsedBBox()
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self.globalzoom = height / (y1 - y0)
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self.offset_x = -1 * x0 * self.globalzoom + (width - (self.globalzoom * (x1 - x0))) / 2
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self.offset_y = -1 * y0 * self.globalzoom
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end
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dc:setZoom(self.globalzoom)
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dc:setOffset(self.offset_x, self.offset_y)
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self.fullwidth, self.fullheight = page:getSize(dc)
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-- set gamma here, we don't have any other good place for this right now:
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if self.globalgamma ~= self.GAMMA_NO_GAMMA then
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print("gamma correction: "..self.globalgamma)
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dc:setGamma(self.globalgamma)
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end
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return dc
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end
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-- render and blit a page
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function PDFReader:show(no)
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local slot
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if self.globalzoommode ~= self.ZOOM_BY_VALUE then
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slot = self:draworcache(no,self.globalzoommode,self.offset_x,self.offset_y,width,height,self.globalgamma)
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else
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slot = self:draworcache(no,self.globalzoom,self.offset_x,self.offset_y,width,height,self.globalgamma)
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end
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fb.bb:blitFullFrom(self.cache[slot].bb)
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if self.rcount == self.rcountmax then
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print("full refresh")
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self.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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self.rcount = self.rcount + 1
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fb:refresh(1)
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end
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self.slot_visible = slot;
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end
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-- change current page and cache next page after rendering
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function PDFReader:goto(no)
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if no < 1 or no > self.doc:getPages() then
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return
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end
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self.pageno = no
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self:show(no)
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if no < self.doc:getPages() then
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if self.globalzoommode ~= self.ZOOM_BY_VALUE then
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-- pre-cache next page
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self:draworcache(no+1,self.globalzoommode,self.offset_x,self.offset_y,width,height,self.globalgamma)
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else
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self:draworcache(no,self.globalzoom,self.offset_x,self.offset_y,width,height,self.globalgamma)
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end
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end
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end
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-- adjust global gamma setting
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function PDFReader:modify_gamma(factor)
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print("modify_gamma, gamma="..self.globalgamma.." factor="..self.factor)
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self.globalgamma = self.globalgamma * self.factor;
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self:goto(self.pageno)
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end
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-- adjust zoom state and trigger re-rendering
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function PDFReader:setglobalzoommode(newzoommode)
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if self.globalzoommode ~= newzoommode then
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self.globalzoommode = newzoommode
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self:goto(self.pageno)
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end
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end
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-- adjust zoom state and trigger re-rendering
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function PDFReader:setglobalzoom(zoom)
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if self.globalzoom ~= zoom then
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self.globalzoommode = self.ZOOM_BY_VALUE
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self.globalzoom = zoom
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self:goto(self.pageno)
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end
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end
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-- wait for input and handle it
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function PDFReader:inputloop()
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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_SHIFT then
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self.shiftmode = true
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elseif ev.code == KEY_ALT then
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self.altmode = true
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elseif ev.code == KEY_PGFWD then
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if self.shiftmode then
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self:setglobalzoom(self.globalzoom*1.2)
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elseif altmode then
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self:setglobalzoom(self.globalzoom*1.1)
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else
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self:goto(self.pageno + 1)
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end
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elseif ev.code == KEY_PGBCK then
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if self.shiftmode then
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self:setglobalzoom(self.globalzoom*0.8)
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elseif altmode then
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self:setglobalzoom(self.globalzoom*0.9)
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else
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self:goto(self.pageno - 1)
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end
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elseif ev.code == KEY_BACK then
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settings.savesetting("last_page", self.pageno)
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settings:close()
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return
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elseif ev.code == KEY_VPLUS then
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self:modify_gamma( 1.25 )
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elseif ev.code == KEY_VMINUS then
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self:modify_gamma( 0.8 )
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elseif ev.code == KEY_A then
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if self.shiftmode then
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self:setglobalzoommode(self.ZOOM_FIT_TO_CONTENT)
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else
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self:setglobalzoommode(self.ZOOM_FIT_TO_PAGE)
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end
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elseif ev.code == KEY_S then
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if self.shiftmode then
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self:setglobalzoommode(self.ZOOM_FIT_TO_CONTENT_WIDTH)
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else
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self:setglobalzoommode(self.ZOOM_FIT_TO_PAGE_WIDTH)
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end
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elseif ev.code == KEY_D then
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if self.shiftmode then
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self:setglobalzoommode(self.ZOOM_FIT_TO_CONTENT_HEIGHT)
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else
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self:setglobalzoommode(self.ZOOM_FIT_TO_PAGE_HEIGHT)
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end
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end
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if self.globalzoommode == self.ZOOM_BY_VALUE then
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local x
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local y
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if self.shiftmode then -- shift always moves in small steps
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x = self.shift_x / 2
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y = self.shift_y / 2
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elseif self.altmode then
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x = self.shift_x / 5
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y = self.shift_y / 5
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elseif self.pan_by_page then
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x = self.width - 5; -- small overlap when moving by page
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y = self.height - 5;
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else
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x = self.shift_x
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y = self.shift_y
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end
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print("offset "..self.offset_x.."*"..self.offset_x.." shift "..x.."*"..y.." globalzoom="..self.globalzoom)
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if ev.code == KEY_FW_LEFT then
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self.offset_x = self.offset_x + x
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self:goto(self.pageno)
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elseif ev.code == KEY_FW_RIGHT then
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self.offset_x = self.offset_x - x
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self:goto(self.pageno)
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elseif ev.code == KEY_FW_UP then
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self.offset_y = self.offset_y + y
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self:goto(self.pageno)
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elseif ev.code == KEY_FW_DOWN then
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self.offset_y = self.offset_y - y
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self:goto(self.pageno)
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elseif ev.code == KEY_FW_PRESS then
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if self.shiftmode then
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self.offset_x = 0
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self.offset_y = 0
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self:goto(pageno)
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else
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self.pan_by_page = not self.pan_by_page
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end
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end
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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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elseif ev.type == EV_KEY and ev.value == EVENT_VALUE_KEY_RELEASE and ev.code == KEY_SHIFT then
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self.shiftmode = false
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elseif ev.type == EV_KEY and ev.value == EVENT_VALUE_KEY_RELEASE and ev.code == KEY_ALT then
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self.altmode = false
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end
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end
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end
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@ -1,50 +0,0 @@
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--[[
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a cache for rendered tiles
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]]--
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cache_max_memsize = 1024*1024*5 -- 5MB tile cache
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cache_current_memsize = 0
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cache = {}
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cache_max_age = 20
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function cacheclaim(size)
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if(size > cache_max_memsize) then
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error("too much memory claimed")
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return false
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end
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repeat
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for k, _ in pairs(cache) do
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if cache[k].age > 0 then
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print("aging slot="..k)
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cache[k].age = cache[k].age - 1
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else
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cache_current_memsize = cache_current_memsize - cache[k].size
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cache[k] = nil
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end
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end
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until cache_current_memsize + size <= cache_max_memsize
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cache_current_memsize = cache_current_memsize + size
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print("cleaned cache to fit new tile (size="..size..")")
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return true
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end
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function draworcache(no, zoom, offset_x, offset_y, width, height, gamma)
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local hash = cachehash(no, zoom, offset_x, offset_y, width, height, gamma)
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if cache[hash] == nil then
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cacheclaim(width * height / 2);
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cache[hash] = {
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age = cache_max_age,
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size = width * height / 2,
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bb = blitbuffer.new(width, height)
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}
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print("drawing page="..no.." to slot="..hash)
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local page = doc:openPage(no)
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local dc = setzoom(page, hash)
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page:draw(dc, cache[hash].bb, 0, 0)
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page:close()
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end
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return hash
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end
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function cachehash(no, zoom, offset_x, offset_y, width, height, gamma)
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return no..'_'..zoom..'_'..offset_x..','..offset_y..'-'..width..'x'..height..'_'..gamma;
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end
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function clearcache()
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cache = {}
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end
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