mirror of
https://github.com/koreader/koreader
synced 2024-11-10 01:10:34 +00:00
114 lines
3.8 KiB
Lua
114 lines
3.8 KiB
Lua
require "cache"
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require "ui/geometry"
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require "ui/screen"
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require "ui/device"
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require "ui/reader/readerconfig"
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KoptInterface = {}
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-- get reflow context
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function KoptInterface:getKOPTContext(doc, pageno)
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local kc = KOPTContext.new()
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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(doc.screen_size.w, doc.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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local bbox = doc:getUsedBBox(pageno)
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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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-- calculates page dimensions
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function KoptInterface:getPageDimensions(doc, pageno, zoom, rotation)
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-- check cached page size
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local hash = "kctx|"..doc.file.."|"..pageno.."|"..doc.configurable:hash('|')
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local cached = Cache:check(hash)
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if not cached then
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local kc = self:getKOPTContext(doc, pageno)
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local page = doc._document:openPage(pageno)
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-- reflow page
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page:reflow(kc, 0)
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page:close()
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local fullwidth, fullheight = kc:getPageDim()
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DEBUG("page::reflowPage:", "fullwidth:", fullwidth, "fullheight:", fullheight)
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local page_size = Geom:new{ w = fullwidth, h = fullheight }
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-- cache reflowed page size and kc
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Cache:insert(hash, CacheItem:new{ kctx = kc })
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return page_size
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end
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--DEBUG("Found cached koptcontex on page", pageno, cached)
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local fullwidth, fullheight = cached.kctx:getPageDim()
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local page_size = Geom:new{ w = fullwidth, h = fullheight }
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return page_size
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end
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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 hash = "renderpg|"..doc.file.."|"..pageno.."|"..doc.configurable:hash('|')
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local page_size = self:getPageDimensions(doc, pageno, zoom, rotation)
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-- this will be the size we actually render
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local size = page_size
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-- we prefer to render the full page, if it fits into cache
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if not Cache:willAccept(size.w * size.h / 2) then
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-- whole page won't fit into cache
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DEBUG("rendering only part of the page")
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-- TODO: figure out how to better segment the page
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if not rect then
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DEBUG("aborting, since we do not have a specification for that part")
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-- required part not given, so abort
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return
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end
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-- only render required part
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hash = "renderpg|"..doc.file.."|"..pageno.."|"..doc.configurable:hash('|').."|"..tostring(rect)
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size = rect
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end
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local cached = Cache:check(hash)
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if cached then return cached end
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-- prepare cache item with contained blitbuffer
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local tile = CacheItem:new{
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size = size.w * size.h / 2 + 64, -- estimation
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excerpt = size,
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pageno = pageno,
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bb = Blitbuffer.new(size.w, size.h)
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}
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-- draw to blitbuffer
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local kc_hash = "kctx|"..doc.file.."|"..pageno.."|"..doc.configurable:hash('|')
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local page = doc._document:openPage(pageno)
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local cached = Cache:check(kc_hash)
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if cached then
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page:rfdraw(cached.kctx, tile.bb)
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page:close()
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DEBUG("cached hash", hash)
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if not Cache:check(hash) then
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Cache:insert(hash, tile)
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end
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return tile
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end
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DEBUG("Error: cannot render page before reflowing.")
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end
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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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