CN114330245A - OFD document processing method and device - Google Patents
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- CN114330245A CN114330245A CN202111369926.4A CN202111369926A CN114330245A CN 114330245 A CN114330245 A CN 114330245A CN 202111369926 A CN202111369926 A CN 202111369926A CN 114330245 A CN114330245 A CN 114330245A
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Abstract
The invention provides a processing method of an OFD document, which comprises the following steps: a. judging whether the OFD document executes page layout or page rendering based on whether the page needs to be displayed, if not, executing the page layout and executing the step b, and if so, executing the page rendering and executing the step c; b. analyzing and loading the visible area page elements in the OFD document corresponding to the page layout, judging whether to execute page rendering or not based on whether the page needs to be displayed or not, and if so, executing incremental loading; c. and analyzing and rendering all page elements in the OFD document. According to the invention, loading on demand is adopted, so that the loading speed and the user experience are greatly improved, and meanwhile, local rendering and rendering on demand are adopted, so that the rendering speed is greatly improved, and the memory is saved. The invention has strong functions, strong practicability and great commercial value.
Description
Technical Field
The invention belongs to the field of OFD document processing, and particularly relates to a method and a device for processing an OFD document.
Background
The OFD is the standard of electronic official document exchange and storage format in China. The OFD format document processing software is used as a core component of the electronic document, provides technical support for business links of formation, storage, signature, exchange, verification, annotation, reading, filing and the like of the electronic document for a user, guarantees authenticity, integrity, usability and safety of the electronic document, and ensures long-term storage and certificate value of the document. The OFD format has the advantages that: 1 property right belongs to an independent property right; 2, portability: the file is small and the compressibility ratio is large. The test shows that the generated file size is smaller than the PDF; 3 has openness: the door is easy to enter, and the door is more open for users; 4, having expansibility: an extensible entrance and a user-defined index are reserved, and a non-contact reference mechanism is set to provide support for characterization; 5, the presenting effect is irrelevant to the equipment, and the layout is fixed and does not run when reading, printing or printing on various equipment; 6, the application is wide: technical support of format documents is required for electronic commerce, electronic official business, information publishing, file exchange, file management and the like.
The OFD adopts a mode of 'container + document' to describe and store data, the container is a virtual storage system, various data description files are aggregated, and a corresponding access interface and a data compression method are provided, and the most important point of the OFD file is that the bottom layer is constructed by xml, so that plate fixation and file stabilization are realized. Since the implementation is realized by xml, the suffix of the OFD file can be changed into zip, the OFD itself is a compressed file, and the file name is not part of the file but part of the file system. The file name is only a mapping mark of the file in the file system, the file does not contain the file name, and the file structure can be seen after decompression.
At present, there is no technical solution capable of solving the above technical problems, and specifically, there is no method and apparatus for processing an OFD document.
Disclosure of Invention
In view of the technical defects in the prior art, an object of the present invention is to provide a method and an apparatus for processing an OFD document, according to an aspect of the present invention, a method for processing an OFD document is provided, which includes the following steps:
a. judging whether the OFD document executes page layout or page rendering based on whether the page needs to be displayed, if not, executing the page layout and executing the step b, and if so, executing the page rendering and executing the step c;
b. analyzing and loading the visible area page elements in the OFD document corresponding to the page layout, judging whether to execute page rendering or not based on whether the page needs to be displayed or not, and if so, executing incremental loading;
c. and analyzing and rendering all page elements in the OFD document.
Preferably, before the step a, the method comprises the steps of:
and decompressing the OFD document to an internal memory to form a byte stream.
Preferably, in the step b, the incremental loading at least includes:
and loading and rendering other page elements except the page elements of the visible area in the OFD document corresponding to the page layout.
Preferably, when the picture parsing in the page element of the visual area is executed in the step b, at least the parsing in the format of bmp, jpg, png, gif, tif is supported by using the stb _ image header file.
Preferably, in the step c, a cairo is adopted to render pictures, paths and texts of the OFD.
Preferably, in the step c, the partial rendering is performed by:
and when the page is enlarged and the enlarged area of the page is larger than the area of the canvas area, only rendering the page in the visible area of the canvas area, wherein for the page in the visible area, acquiring a corresponding sub-picture from the original picture according to the drawable proportion of the page, and scaling the sub-picture by using opencv.
Preferably, in the step c, a FreeType is used to render the non-system font.
Preferably, after the step c, the method further comprises:
d. and processing the searching, selecting and copying of characters in the page elements by adopting the same thread as the page rendering.
According to another aspect of the present invention, there is provided a processing apparatus for an OFD document, which employs the processing method, including:
the first judging device: judging whether the OFD document executes page layout or page rendering based on whether the page needs to be displayed;
a first processing device: analyzing and loading the visible area page elements in the OFD document corresponding to the page layout, and judging whether to execute page rendering again based on whether the page needs to be displayed;
a second processing device: and analyzing and rendering all page elements in the OFD document.
Preferably, the method further comprises the following steps:
a third processing device: and processing the searching, selecting and copying of characters in the page elements by adopting the same thread as the page rendering.
The invention provides a method for realizing service page processing based on an xpath technology, which judges whether an OFD document executes page layout or page rendering based on whether the page needs to be displayed, if not, executes the page layout and executes a step b, and if so, executes the page rendering and executes a step c; analyzing and loading the visible area page elements in the OFD document corresponding to the page layout, judging whether to execute page rendering or not based on whether the page needs to be displayed or not, and if so, executing incremental loading; and analyzing and rendering all page elements in the OFD document. The OFD protocol is based on an xml protocol structure, is based on memory efficient analysis, analyzes page content according to the using scene increment, needs to load page size in page layout, only analyzes partial content, is high in speed, needs to analyze all the content of the page when the page is rendered, needs to acquire the size of each document when the document is opened, but only renders a few pages of a visible area, and adopts loading according to needs, so that the loading speed and the user experience are greatly improved. The invention simultaneously adopts local rendering and rendering according to requirements, thereby greatly improving the rendering speed and saving the memory. The invention has simple structure, convenient use and extremely high commercial value.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic flow chart showing a specific flow of a method for processing an OFD document according to an embodiment of the present invention;
fig. 2 is a detailed flowchart illustrating a processing method of an OFD document according to a first embodiment of the present invention; and
fig. 3 shows a module connection diagram of an OFD document processing apparatus according to another embodiment of the present invention.
Detailed Description
In order to better clearly show the technical solution of the present invention, the present invention is further described with reference to the accompanying drawings, it is to be understood that the specific embodiments described herein are only for illustrating the present invention and are not to be construed as limiting the present invention, and all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention are within the protection scope of the present invention without creative efforts.
Fig. 1 shows a specific flowchart of a method for processing an OFD document according to a specific embodiment of the present invention, and those skilled in the art understand that an OFD document can be understood as a zip packet in practice, and decompress the entire document into a memory, and if necessary, directly read from the memory, and the present invention provides a method for processing an OFD document based on an OFD basic principle, which greatly improves a loading speed and user experience, and includes the following steps:
firstly, the method enters step S101, whether the OFD document executes page layout or page rendering is judged based on whether the page needs to be displayed, if the page does not need to be displayed, the page layout is executed and step S102 is executed, if the page needs to be displayed, the page rendering is executed and step S103 is executed, after the OFD document is loaded, the page layout is carried out, the layout can be completed only by knowing the size of all the pages, and the size of each page can be known only by analyzing each page element.
Furthermore, the OFD document has a plurality of pages, the size of each page needs to be loaded and analyzed according to the needs, but the number of pages which can be displayed is really the same, so that most of the pages only load and analyze the size of the page, time consumption is low, and all contents are loaded to a small number of pages for rendering, but the time consumption is high, and the viewing speed of the multi-page complex page is greatly improved through the scheme.
Further, before the step S101, the method includes the steps of: the OFD document is decompressed to an internal memory to form a byte stream, the OFD document is a zip packet, the xml file in the OFD document can be analyzed after the OFD document is unpacked, the xml file is analyzed to the internal memory to form the byte stream, the speed and the stability are greatly improved, if the speed of reading and writing the file is greatly reduced when the OFD document is decompressed to a hard disk, the hard disk decompressed by the file has authority problems, if the OFD document is placed in a low authority area, the OFD document is easily killed, deleted and damaged by other programs, and the decompression to the internal memory is most suitable in performance and stability.
Then, step S102 is entered, the visible area page elements in the OFD document corresponding to the page layout are analyzed and loaded, and whether page rendering is to be performed is determined again based on whether the page needs to be displayed, if so, incremental loading is performed, where the incremental loading at least includes loading and rendering other page elements except the visible area page elements in the OFD document corresponding to the page layout, the document is loaded in the canvas area layout, and the page rendering may load the document, where the former only loads part of the elements, and the latter continuously needs to load all, and the client only loads part and needs to render the rest part when the screen is laid out, so as to implement incremental loading. The OFD protocol is based on an xml protocol structure, is based on memory efficient analysis, analyzes page content according to the using scene increment, needs to load page size in page layout, only analyzes partial content, is high in speed, needs to analyze all the content of the page when the page is rendered, needs to acquire the size of each document when the document is opened, but only renders a few pages of a visible area, and adopts loading according to needs, so that the loading speed and the user experience are greatly improved.
Further, when the picture analysis in the page element of the visible area is executed in the step S102, the stb _ image header file is used to at least support the analysis of the bmp, jpg, png, gif, tif formats.
Finally, step S103 is entered, all page elements in the OFD document are parsed and rendered, in step S103, pictures, paths, and texts of the OFD are rendered by Cairo, which is a free function library for providing vector graphic drawings, and Cairo provides drawings for 2D in multiple contexts, and further, hardware acceleration function can be used.
Further, in the step S103, the partial rendering is performed by: when a page is enlarged and the enlarged area of the page is larger than the area of a canvas area, only rendering the page in the visible area of the canvas area, wherein for the page in the visible area, a corresponding sub-picture is obtained from an original picture according to the ratio of the page to be drawn, the sub-picture is scaled according to the ratio by opencv, regarding local rendering, if the whole enlarged large page is rendered, a large memory is needed and all objects on the page are needed to be drawn, the larger the scaling ratio is, the more the memory is consumed, if the local rendering is used, only the memory corresponding to the size of the visible area of a screen is needed no matter the scaling ratio is large, and only rendering the objects in the visible area during rendering the objects, other objects do not need to be rendered, and the memory and the time are greatly saved. More specifically, when viewing a document using a high zoom ratio, the canvas area of the program window can only display a partial area of one or a few pages; when the page in the canvas area is rendered, only the displayable area of the page in the canvas area is rendered, so that the rendering speed is greatly improved, and the memory rendering cost is reduced.
Further, when a page is enlarged and the enlarged area of the page is larger than the area of the canvas area, in order to improve the rendering speed and reduce the memory overhead, only the page in the visible area of the canvas area is rendered, which relates to coordinate conversion, ofd each rendering object needs to judge whether the rendering object is in the visible area and does not render in the visible area, for the picture in the visible area, according to the drawing proportion of the picture, the corresponding sub-picture is obtained from the original picture, the sub-picture is scaled according to the opencv proportion, the memory can be saved, the performance can be improved, the rendering quality can be improved, the scaling quality is improved by adopting the opencv when the picture is scaled, and the quality of the picture after the document is enlarged or reduced can be ensured to be undistorted.
Further, regarding the coordinate transformation in the foregoing, the OFD page mainly includes text objects, picture objects, path objects, and the like, the positions of these objects are not kept in the document as they are seen on the screen, the positions after partial rendering are more difficult to calculate, and much of them stores relative positions and a transformation matrix, by which the objects can be translated, scaled, and rotated, and we carefully need to construct an additional matrix for translation and scaling during partial rendering. For example: the method comprises the following steps that a room is arranged, a table is arranged in the room, a pen is arranged on the table, the position of the pen can be described, the position of the table is at the position of AA in the room, the position of the pen is at the position of BB of the table, the position of CC of the pen in the room can be calculated by the AA by the BB, the CC is obtained by the AA in the mode of matrix conversion, and the AA is equivalent to a transformation matrix. Drawing an operation object: the object described here is a structure in which text, pictures, and paths that we see on the screen are stored in the OFD file, for example, a piece of text is stored by a text object, and a picture is stored by a picture object. The scale in which the picture can be drawn: after the picture is enlarged, only a part of the picture can be displayed in a visible area of a screen, and a part of the picture needs to be obtained from an element picture according to a proportion for zooming, wherein an original picture is stored in an OFD resource folder, and characters are stored in a page file and described by xml.
Further, in step S103, a non-system font is rendered by using the FreeType, and a non-system font is rendered by using the FreeType for the text, so that text display compatibility is improved.
Fig. 2 shows a detailed flowchart of a processing method of an OFD document according to a first embodiment of the present invention, and specifically includes the following steps:
those skilled in the art understand that the steps S201 to S202 may refer to the foregoing steps S101 to S103, and after the step S203, the method further includes S204, processing the search, selection and copy of the text in the page element by using the same thread as the page rendering.
Furthermore, the invention combines rendering with searching, selecting and copying to carry out efficient and safe processing, for the rendering, a rendering thread is used for page rendering, the area occupied by the characters is related to the fonts, the fonts are just needed during rendering, and the positions of the characters are calculated after the characters are rendered for the first time.
Furthermore, the invention uses the rendering thread to search page by page, records all matched character positions in the page, matches the position of the search string in the character object, draws the matched search content on the page after drawing the page in the visible area, obtains the position of the search content matched on the page through the position of the search content matched on the page to render, and only the page has a character area after rendering. Through the steps, the whole searching function is efficiently and safely solved, the characters in the page are analyzed during page rendering and searching, but the page rendering and the searching do not need to be synchronously locked in the same thread, and the performance and the safety are greatly improved.
Further, for selection, all pages capable of being selected are rendered pages, character areas on the pages are calculated, multithreading safety problems do not need to be considered during selection, when a full selection mode is entered, after the pages behind the visible area are rendered, the character selection areas are drawn, and after the pages are rendered, the character areas are calculated.
Further, for copying, the characters in the region are acquired according to the selected region, the regions capable of being selected are rendered, and of course, the character region is also calculated, and the selected characters can be directly acquired. And when the full selection is performed, the characters in all the pages are obtained, and the characters in all the pages are loaded through the rendering thread, so that the main thread is not consumed, and the rendering safety is ensured.
Fig. 3 shows a module connection diagram of an OFD document processing apparatus according to another embodiment of the present invention, and the present invention further provides an OFD document processing apparatus using the processing method, including the first determining apparatus 1: based on whether the page needs to be displayed, whether the OFD document performs page layout or page rendering is determined, the operation principle of the first determining apparatus 1 may refer to the step S101, which is not described herein again.
Further, the processing apparatus further comprises a first processing apparatus 2: analyzing and loading the page elements of the visible area in the OFD document corresponding to the page layout, and determining whether to perform page rendering again based on whether the page needs to be displayed, where the working principle of the first processing device 2 may refer to the step S102, which is not described herein again.
Further, the processing apparatus further comprises a second processing apparatus 3: analyzing and rendering all page elements in the OFD document, the working principle of the second processing device 3 may refer to the step S103, which is not described herein again.
Further, the processing apparatus further comprises a third processing apparatus 4: the same thread as the page rendering is used to process the search, selection and copy of the characters in the page element, and the working principle of the third processing device 4 may refer to the step S204, which is not described herein again.
It should be noted that the specific implementation of each of the above device embodiments is the same as the specific implementation of the corresponding method embodiment, and is not described herein again.
The algorithms and displays presented herein are not inherently related to any particular computer, virtual machine, or other apparatus. Various general purpose devices may be used with the teachings herein. The required structure for constructing such a device will be apparent from the description above. Moreover, the present invention is not directed to any particular programming language. It is appreciated that a variety of programming languages may be used to implement the teachings of the present invention as described herein, and any descriptions of specific languages are provided above to disclose the best mode of the invention.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some embodiments, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the invention and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Furthermore, those of skill in the art will understand that although some embodiments described herein include some features included in other embodiments, not others, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
The various component embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functionality of some or all of the components in an apparatus according to an embodiment of the invention. The present invention may also be embodied as apparatus or device programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present invention may be stored on computer-readable media or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (10)
1. A processing method of OFD documents is characterized by comprising the following steps:
a. judging whether the OFD document executes page layout or page rendering based on whether the page needs to be displayed, if not, executing the page layout and executing the step b, and if so, executing the page rendering and executing the step c;
b. analyzing and loading the visible area page elements in the OFD document corresponding to the page layout, judging whether to execute page rendering or not based on whether the page needs to be displayed or not, and if so, executing incremental loading;
c. and analyzing and rendering all page elements in the OFD document.
2. The process of claim 1, characterized in that before said step a, it comprises a step i:
and decompressing the OFD document to an internal memory to form a byte stream.
3. The processing method according to claim 1, wherein in the step b, the incremental loading at least comprises:
and loading and rendering other page elements except the page elements of the visible area in the OFD document corresponding to the page layout.
4. The processing method according to claim 1, wherein when performing the picture parsing in the page element of the visual area in the step b, at least the parsing in the format of bmp, jpg, png, gif, tif is supported using a stb _ image header file.
5. The processing method according to claim 1, wherein in the step c, a cairo is adopted to render pictures, paths, and texts of the OFD.
6. The processing method according to claim 1, wherein in step c, the partial rendering is performed by:
and when the page is enlarged and the enlarged area of the page is larger than the area of the canvas area, only rendering the page in the visible area of the canvas area, wherein for the page in the visible area, acquiring a corresponding sub-picture from the original picture according to the drawable proportion of the page, and scaling the sub-picture by using opencv.
7. The processing method according to claim 1, wherein in step c, FreeType is used to render non-system fonts.
8. The process of claim 1, further comprising, after step c:
d. and processing the searching, selecting and copying of characters in the page elements by adopting the same thread as the page rendering.
9. An OFD document processing apparatus that employs the processing method according to any one of claims 1 to 8, characterized by comprising:
first determination device (1): judging whether the OFD document executes page layout or page rendering based on whether the page needs to be displayed;
first treatment device (2): analyzing and loading the visible area page elements in the OFD document corresponding to the page layout, and judging whether to execute page rendering again based on whether the page needs to be displayed;
second treatment device (3): and analyzing and rendering all page elements in the OFD document.
10. The processing apparatus as in claim 9, further comprising:
third treatment device (4): and processing the searching, selecting and copying of characters in the page elements by adopting the same thread as the page rendering.
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| CN202111369926.4A CN114330245A (en) | 2021-11-18 | 2021-11-18 | OFD document processing method and device |
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| CN202111369926.4A CN114330245A (en) | 2021-11-18 | 2021-11-18 | OFD document processing method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115982498A (en) * | 2022-12-26 | 2023-04-18 | 河南翔宇医疗设备股份有限公司 | Component loading method, device and medium |
| CN117521605A (en) * | 2024-01-04 | 2024-02-06 | 北京点聚信息技术有限公司 | Electronic signature method and system for OFD format file |
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| CN111897776A (en) * | 2020-06-22 | 2020-11-06 | 百望股份有限公司 | OFD document processing method, electronic device and computer-readable storage medium |
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| US20150046797A1 (en) * | 2013-08-08 | 2015-02-12 | Peking University Founder Group Co., Ltd. | Document format processing apparatus and document format processing method |
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| CN117521605A (en) * | 2024-01-04 | 2024-02-06 | 北京点聚信息技术有限公司 | Electronic signature method and system for OFD format file |
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Application publication date: 20220412 |