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https://github.com/koreader/koreader
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031df2ffee
So an image file can have a cover in coverbrowser's display. It also allows for an alternative viewer (ImageViewer widget) when holding on file / View full size cover.
59 lines
1.4 KiB
Lua
59 lines
1.4 KiB
Lua
local Document = require("document/document")
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local DrawContext = require("ffi/drawcontext")
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local pic = nil
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local PicDocument = Document:new{
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_document = false,
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is_pic = true,
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dc_null = DrawContext.new()
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}
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function PicDocument:init()
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if not pic then pic = require("ffi/pic") end
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local ok
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ok, self._document = pcall(pic.openDocument, self.file)
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if not ok then
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error("Failed to open jpeg image")
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end
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self.info.has_pages = true
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self.info.configurable = false
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self:_readMetadata()
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end
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function PicDocument:getUsedBBox(pageno)
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return { x0 = 0, y0 = 0, x1 = self._document.width, y1 = self._document.height }
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end
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function PicDocument:getProps()
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local _, _, docname = self.file:find(".*/(.*)")
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docname = docname or self.file
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return {
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title = docname:match("(.*)%."),
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}
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end
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function PicDocument:getCoverPageImage()
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local f = io.open(self.file, "rb")
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if f then
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local data = f:read("*all")
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f:close()
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local Mupdf = require("ffi/mupdf")
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local ok, image = pcall(Mupdf.renderImage, data, data:len())
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if ok then
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return image
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end
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end
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return nil
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end
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function PicDocument:register(registry)
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registry:addProvider("jpeg", "image/jpeg", self)
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registry:addProvider("jpg", "image/jpeg", self)
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registry:addProvider("png", "image/png", self)
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registry:addProvider("gif", "image/gif", self)
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end
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return PicDocument
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