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require "cache"
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require "ui/geometry"
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require "ui/device"
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require "ui/reader/readerconfig"
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KoptInterface = {}
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function KoptInterface:waitForContext(kc)
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-- if koptcontext is being processed in background thread
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-- the isPreCache will return 1.
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while kc and kc:isPreCache() == 1 do
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DEBUG("waiting for background rendering")
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util.usleep(100000)
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end
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end
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-- get reflow context
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function KoptInterface:getKOPTContext(doc, pageno, bbox)
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-- Now koptcontext keeps track of its dst bitmap reflowed by libk2pdfopt.
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-- So there is no need to check background context when creating new context.
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local kc = KOPTContext.new()
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local screen_size = Screen:getSize()
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kc:setTrim(doc.configurable.trim_page)
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kc:setWrap(doc.configurable.text_wrap)
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kc:setIndent(doc.configurable.detect_indent)
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kc:setRotate(doc.configurable.screen_rotation)
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kc:setColumns(doc.configurable.max_columns)
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kc:setDeviceDim(screen_size.w, screen_size.h)
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kc:setDeviceDPI(doc.screen_dpi)
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kc:setStraighten(doc.configurable.auto_straighten)
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kc:setJustification(doc.configurable.justification)
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kc:setZoom(doc.configurable.font_size)
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kc:setMargin(doc.configurable.page_margin)
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kc:setQuality(doc.configurable.quality)
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kc:setContrast(doc.configurable.contrast)
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kc:setDefectSize(doc.configurable.defect_size)
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kc:setLineSpacing(doc.configurable.line_spacing)
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kc:setWordSpacing(doc.configurable.word_spacing)
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kc:setBBox(bbox.x0, bbox.y0, bbox.x1, bbox.y1)
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return kc
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end
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function KoptInterface:getContextHash(doc, pageno, bbox)
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local screen_size = Screen:getSize()
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local screen_size_hash = screen_size.w.."|"..screen_size.h
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local bbox_hash = bbox.x0.."|"..bbox.y0.."|"..bbox.x1.."|"..bbox.y1
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return doc.file.."|"..pageno.."|"..doc.configurable:hash("|").."|"..bbox_hash.."|"..screen_size_hash
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end
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function KoptInterface:logReflowDuration(pageno, dur)
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local file = io.open("reflowlog.txt", "a+")
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if file then
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if file:seek("end") == 0 then -- write the header only once
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file:write("PAGE\tDUR\n")
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end
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file:write(string.format("%s\t%s\n", pageno, dur))
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file:close()
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end
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end
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function KoptInterface:getAutoBBox(doc, pageno)
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local bbox = {
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x0 = 0, y0 = 0,
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x1 = 0, y1 = 0,
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}
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local context_hash = self:getContextHash(doc, pageno, bbox)
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local hash = "autobbox|"..context_hash
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local cached = Cache:check(hash)
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if not cached then
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local page = doc._document:openPage(pageno)
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local kc = self:getKOPTContext(doc, pageno, bbox)
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bbox.x0, bbox.y0, bbox.x1, bbox.y1 = page:getAutoBBox(kc)
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DEBUG("Auto detected bbox", bbox)
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page:close()
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Cache:insert(hash, CacheItem:new{ bbox = bbox })
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return bbox
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else
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return cached.bbox
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end
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end
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-- get reflowed page dimension from a cached context. wait for background thread
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-- if necessary.
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function KoptInterface:getReflowedDim(kctx)
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self:waitForContext(kctx)
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return kctx:getPageDim()
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end
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-- get cached koptcontext for centain page. if context doesn't exist in cache make
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-- new context and reflow the src page immediatly.
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function KoptInterface:getCachedContext(doc, pageno)
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local bbox = doc:getPageBBox(pageno)
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local context_hash = self:getContextHash(doc, pageno, bbox)
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local kctx_hash = "kctx|"..context_hash
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local cached = Cache:check(kctx_hash)
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if not cached then
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-- If kctx is not cached, create one and get reflowed bmp in foreground.
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local kc = self:getKOPTContext(doc, pageno, bbox)
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local page = doc._document:openPage(pageno)
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-- reflow page
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--local secs, usecs = util.gettime()
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page:reflow(kc, 0)
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page:close()
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--local nsecs, nusecs = util.gettime()
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--local dur = nsecs - secs + (nusecs - usecs) / 1000000
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--DEBUG("Reflow duration:", dur)
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--self:logReflowDuration(pageno, dur)
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local fullwidth, fullheight = kc:getPageDim()
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DEBUG("reflowed page", pageno, "fullwidth:", fullwidth, "fullheight:", fullheight)
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Cache:insert(kctx_hash, CacheItem:new{ kctx = kc })
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return kc
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else
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return cached.kctx
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end
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end
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-- get reflowed page dimensions
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function KoptInterface:getPageDimensions(doc, pageno, zoom, rotation)
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local kctx = self:getCachedContext(doc, pageno)
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local fullwidth, fullheight = self:getReflowedDim(kctx)
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return Geom:new{ w = fullwidth, h = fullheight }
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end
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-- inherited from common document interface
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-- render reflowed page into tile cache.
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function KoptInterface:renderPage(doc, pageno, rect, zoom, rotation, render_mode)
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doc.render_mode = render_mode
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local bbox = doc:getPageBBox(pageno)
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local context_hash = self:getContextHash(doc, pageno, bbox)
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local renderpg_hash = "renderpg|"..context_hash
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local cached = Cache:check(renderpg_hash)
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if not cached then
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-- do the real reflowing if kctx is not been cached yet
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local kctx = self:getCachedContext(doc, pageno)
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local fullwidth, fullheight = self:getReflowedDim(kctx)
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if not Cache:willAccept(fullwidth * fullheight / 2) then
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-- whole page won't fit into cache
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error("aborting, since we don't have enough cache for this page")
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end
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local page = doc._document:openPage(pageno)
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-- prepare cache item with contained blitbuffer
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local tile = CacheItem:new{
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size = fullwidth * fullheight / 2 + 64, -- estimation
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excerpt = Geom:new{ w = fullwidth, h = fullheight },
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pageno = pageno,
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bb = Blitbuffer.new(fullwidth, fullheight)
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}
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page:rfdraw(kctx, tile.bb)
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page:close()
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-- free dst bitmap in kctx as soon as we draw the bitmap to blitbuffer
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kctx:free()
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Cache:insert(renderpg_hash, tile)
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return tile
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else
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return cached
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end
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end
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-- inherited from common document interface
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-- render reflowed page into cache in background thread. this method returns immediatly
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-- leaving the precache flag on in context. subsequent usage of this context should
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-- wait for the precache flag off by calling self:waitForContext(kctx)
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function KoptInterface:hintPage(doc, pageno, zoom, rotation, gamma, render_mode)
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local bbox = doc:getPageBBox(pageno)
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local context_hash = self:getContextHash(doc, pageno, bbox)
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local kctx_hash = "kctx|"..context_hash
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local cached = Cache:check(kctx_hash)
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if not cached then
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local kc = self:getKOPTContext(doc, pageno, bbox)
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local page = doc._document:openPage(pageno)
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DEBUG("hinting page", pageno, "in background")
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-- reflow will return immediately and running in background thread
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kc:setPreCache()
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page:reflow(kc, 0)
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page:close()
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Cache:insert(kctx_hash, CacheItem:new{ kctx = kc })
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end
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end
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-- inherited from common document interface
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-- draw cached tile pixels into target blitbuffer
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function KoptInterface:drawPage(doc, target, x, y, rect, pageno, zoom, rotation, render_mode)
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local tile = self:renderPage(doc, pageno, rect, zoom, rotation, render_mode)
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--DEBUG("now painting", tile, rect)
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target:blitFrom(tile.bb,
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x, y,
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rect.x - tile.excerpt.x,
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rect.y - tile.excerpt.y,
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rect.w, rect.h)
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end
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