CN108733673B - Cross-domain picture export method and export device, electronic equipment and storage medium - Google Patents
Cross-domain picture export method and export device, electronic equipment and storage medium Download PDFInfo
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- CN108733673B CN108733673B CN201710244336.6A CN201710244336A CN108733673B CN 108733673 B CN108733673 B CN 108733673B CN 201710244336 A CN201710244336 A CN 201710244336A CN 108733673 B CN108733673 B CN 108733673B
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Abstract
The disclosure relates to a cross-domain picture exporting method and device, electronic equipment and a computer readable storage medium, which are applied to canvas export of cross-domain pictures. The derivation method comprises the following steps: converting the original picture into a target format and storing the target format in a script file form to a content distribution network server; loading a script file in the content distribution network server and creating an embedded image according to the script file; and drawing the embedded image to a preset region of a canvas and exporting a visual region corresponding to the preset region of the canvas as a target picture. The present disclosure may solve the export problem of the canvas when loading the cross-domain picture.
Description
Technical Field
The present disclosure relates to the field of computer technologies, and in particular, to a method and an apparatus for exporting a cross-domain picture, an electronic device, and a computer-readable storage medium.
Background
Canvas technology is one of the elements in the standard universal markup language HTML5 standard for web pages, which provides the ability to render vector graphics on the client side, primarily the web page side. The method can load a plurality of bitmaps and draw the bitmaps to the screen area of the canvas, and also provides an Application Programming Interface (API) of the TODataURL for calling, so that the drawing content of the screen area of the current canvas is saved as a bitmap format file.
At present, a large number of rich text pictures with large volumes are contained in internet sites, and in order to ensure that the pictures can be accessed quickly and save storage cost, site developers and administrators can store the pictures in Content Delivery Network (CDN) servers in different domains of the sites. After the canvas loads pictures of different domains for drawing, the following errors are prompted when the toDataURL is called to save the pictures: the imported canvas male not be exported; the meaning of its expression is: this action violates the homologous policy and the functional flow is interrupted. Therefore, when the canvas loads pictures in different domains and calls the toDataURL to export the pictures, the pictures can be reported by mistake and cannot be exported normally.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
An object of the present disclosure is to provide a method and an apparatus for deriving a cross-domain picture, an electronic device, and a computer-readable storage medium, which overcome one or more of the problems due to the limitations and disadvantages of the related art, at least to some extent.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows, or in part will be obvious from the description, or may be learned by practice of the disclosure.
According to one aspect of the disclosure, a method for exporting a cross-domain picture is provided, which is applied to a canvas to export the cross-domain picture; the derivation method comprises the following steps:
converting the original picture into a target format and storing the target format in a script file form to a content distribution network server;
loading a script file in the content distribution network server and creating an embedded image according to the script file;
and drawing the embedded image to a preset region of a canvas and exporting a visual region corresponding to the preset region of the canvas as a target picture.
In an exemplary embodiment of the present disclosure, the storing to the content distribution network server in the form of a script file includes:
inputting the target format into a script file in a mode of key values;
and storing the script file to the content distribution network server.
In an exemplary embodiment of the present disclosure, the entering the target format into the script file by using a key value includes:
and storing in a hash table mode.
In an exemplary embodiment of the present disclosure, the loading the script file in the content distribution network server includes:
judging whether the loading task fails according to the error event; and/or the presence of a gas in the gas,
and judging whether the loading task is completed or not according to the loading time.
In an exemplary embodiment of the present disclosure, the creating an embedded image according to the script file includes:
and acquiring necessary data through keys according to the script file to create the embedded image.
In an exemplary embodiment of the present disclosure, the exporting, as the target picture, the visual area corresponding to the predetermined area of the canvas includes:
and exporting the visual area corresponding to the preset area of the canvas as a target picture by using a mode of a TODataURL.
In an exemplary embodiment of the present disclosure, the target format includes a Base64 format, the script file includes a JavaScript script file, and the target picture includes a bitmap picture.
According to one aspect of the present disclosure, there is provided a device for exporting a cross-domain picture, which is applied to a canvas to export the cross-domain picture; the derivation means includes:
the picture conversion module is used for converting the original picture into a target format and storing the target format to the content distribution network server in the form of a script file;
the image creating module is used for loading the script file in the content distribution network server and creating an embedded image according to the script file;
and the picture export module is used for drawing the embedded image to a preset region of a canvas and exporting a visible region corresponding to the preset region of the canvas as a target picture.
In an exemplary embodiment of the present disclosure, the picture conversion module includes:
the picture conversion unit is used for converting the original picture into a target format;
the data processing unit is used for inputting the target format into a script file in a mode of key values;
and the data uploading unit is used for storing the script file to the content distribution network server.
In an exemplary embodiment of the present disclosure, a storage manner of the data processing unit includes:
and storing in a hash table mode.
In an exemplary embodiment of the present disclosure, the image creation module includes:
a data loading unit, configured to load a script file in the content distribution network server;
the data judging unit is used for judging whether the loading task fails according to the error event and/or judging whether the loading task is completed according to the loading time;
and the image creating unit is used for creating an embedded image according to the script file.
In an exemplary embodiment of the present disclosure, the picture derivation module includes:
the picture drawing unit is used for drawing the embedded image to a preset region of a canvas;
the picture export unit is used for exporting the visual area corresponding to the canvas preset area as a target picture in a TODataURL mode;
the visible area is an area in which the embedded image is drawn in the preset area of the canvas.
In an exemplary embodiment of the present disclosure, the target format includes a Base64 format, the script file includes a JavaScript script file, and the target picture includes a bitmap picture.
According to an aspect of the present disclosure, there is provided an electronic device including:
a processor; and
a memory for storing executable instructions of the processor;
wherein the processor is configured to execute the above-mentioned cross-domain picture derivation method via execution of the executable instructions.
According to an aspect of the present disclosure, there is provided a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above-mentioned cross-domain picture derivation method.
The export method and export device for the cross-domain picture provided by the exemplary embodiment of the disclosure can convert an original picture into a target format to input a script file and store the script file in the CDN server, and when a canvas loads the cross-domain picture, the script file is actually loaded, and then a new embedded image is created by the script file and drawn to a predetermined region of the canvas, thereby ensuring that the canvas can export the picture normally when the canvas loads the cross-domain picture. On one hand, the cross-domain picture export method is simple in configuration and low in cost; on the other hand, the picture to be loaded is stored in the CDN server in a domain different from the site where the canvas is located, so that the load of the site server side is not increased, and the method has good adaptability to the site with large user access flow.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.
Fig. 1 schematically shows a flow chart of steps of a cross-domain picture derivation method in an exemplary embodiment of the present disclosure;
fig. 2 schematically illustrates a flow diagram of a cross-domain picture derivation method in an exemplary embodiment of the present disclosure;
fig. 3 schematically shows a system architecture diagram of a cross-domain picture derivation method in an exemplary embodiment of the present disclosure;
FIG. 4 schematically illustrates an example diagram of raw picture conversion to Base64 data in an example embodiment of the disclosure;
fig. 5 schematically shows a schematic block diagram of an apparatus for deriving a cross-domain picture in an exemplary embodiment of the present disclosure;
fig. 6 schematically illustrates a block diagram of an electronic device in an exemplary embodiment of the present disclosure.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.
The disclosed exemplary embodiment provides a cross-domain picture export method, which is used for solving the export problem of canvas loading cross-domain pictures; as shown in fig. 1, the derivation method may include:
s1, converting the original picture into a target format and storing the target format in a form of a script file to a Content Delivery Network (CDN) server;
s2, loading a script file in the CDN server and creating an embedded image according to the script file;
and S3, drawing the embedded image to a predetermined region of a canvas and exporting a visual region corresponding to the predetermined region of the canvas as a target picture.
According to the method for exporting the cross-domain picture, the original picture can be converted into the target format to be input into the script file and stored in the CDN server, the script file is actually loaded when the canvas loads the cross-domain picture, and then the new embedded image is created through the script file and drawn to the preset region of the canvas, so that the picture can be normally exported when the canvas loads the cross-domain picture. On one hand, the cross-domain picture export method is simple in configuration and low in cost; on the other hand, the picture to be loaded is stored in the CDN server in a domain different from the site where the canvas is located, so that the load of the site server side is not increased, and the method has good adaptability to the site with large user access flow.
The method for deriving a cross-domain picture in the present exemplary embodiment is described in detail below with reference to fig. 2 and 3.
In step S1, the original picture is converted into a target format and stored to a content delivery network CDN server in the form of a script file.
In this example embodiment, the Format of the original picture may include a plurality of Image File formats suitable for the internet, such as PNG (Portable Network Graphics), JPEG (Joint Photographic Expert Group), TIFF (Tagged Image File Format), and GIF (Graphics Interchange Format). The target format may include the Base64 text format, which is essentially an encoding scheme that may be used to transmit 8Bit byte codes over a network.
Specifically, the step S1 may include:
s11, converting the original picture into a target format;
wherein the target format may be, for example, the Base64 text format; since the direct data source of Base64 is a binary sequence, it is necessary here to convert the original pictures into a binary sequence first and then convert the binary sequence into Base64 coding. In addition, this step may use tools (e.g., Nodejs, station leader tool or client tool, etc.) to implement the conversion of the picture format.
S12, inputting the target format into a script file in a mode of key values;
the storage mode of the target format in the script file can adopt a variable statement Hash table storage mode; the script file may be, for example, a JavaScript script file, and the JavaScript script file is JavaScript code encoded at Base 64. For example, the name of picture 1 corresponds to the Base64 data of picture 1, the name of picture 2 corresponds to the Base64 data of picture 2, and the name of picture N corresponds to the Base64 data of picture N.
It should be noted that: the JavaScript script file needs to expose a global variable entry for the canvas to access.
And S13, storing the script file to the CDN server of the content delivery network.
And the script file is stored in the CDN server and returns the request content to the user according to the request of the browser end.
For example, picture resources of the internet site www.a.com are all saved under the domain name of the internet site www.b.com, while the canvas itself belongs under the domain name of the internet site www.a.com; when the picture in the canvas is loaded, as shown in fig. 4, the original picture to be loaded is converted into a code in Base64 format by using a Nodejs tool, and the code in Base64 is recorded into a JavaScript script file in a storage manner of a hash table and uploaded to a CDN server.
In step S2, a script file in the CDN server is loaded and an embedded image is created according to the script file.
In this exemplary embodiment, when the canvas site loads, for example, a JavaScript script file in the CDN server, whether the loading task fails may be determined according to an error event (i.e., an error event); and, whether the loading task is completed can be judged according to the loading time (i.e. onload time). On the basis, corresponding picture data can be obtained by a key according to the requirement aiming at the JavaScript file which is successfully loaded, and then an embedded image is created; wherein the embedded Image may be created by an Image object of HTML.
Com loads a JavaScript file in a CDN server, and when an onerror event is not prompted and onload time meets the requirement, the JavaScript file is loaded successfully; at the moment, corresponding picture data are obtained through keys according to needs, and an embedded Image is created according to the obtained picture data by utilizing the Image function of the HTML.
In step S3, the embedded image is drawn to a predetermined region of the canvas and a visual region corresponding to the predetermined region of the canvas is exported as a target picture.
In this example embodiment, the visible area corresponding to the canvas predetermined area refers to an area in which the embedded image is drawn in the canvas predetermined area, and the target picture may include a bitmap picture. The drawing of the embedded image to the preset region of the canvas can be realized by a drawImage function of the canvas, and the derivation of the target picture can be realized by a TODataURL function of the canvas.
For example, the created embedded image is drawn into a predetermined area of the canvas using the drawImage function of the canvas, and the viewable area is exported as a bitmap picture using the toDataURL function of the canvas.
Based on the steps S1 to S3, the cross-domain picture can be exported by using the canvas. The exporting method comprises the steps of original picture-data code-target picture, firstly, converting the picture into the data code, and then redrawing the picture according to the data code to realize the export of the picture, thereby solving the problem that the cross-domain picture loaded by canvas in the prior art can not be exported normally.
The exemplary embodiment of the present disclosure further provides a device 10 for exporting a cross-domain picture, which is applied to a canvas to export the cross-domain picture; as shown in fig. 5, the deriving means 10 may include:
the picture conversion module 11 is used for converting the original picture into a target format and storing the target format in the form of a script file to the content distribution network server;
an image creating module 12, configured to load a script file in the content distribution network server and create an embedded image according to the script file;
and the picture export module 13 is configured to draw the embedded image to a predetermined region of a canvas and export a visible region corresponding to the predetermined region of the canvas as a target picture.
The export device of the cross-domain picture provided by the exemplary embodiment of the disclosure can convert an original picture into a target format to input a script file and store the script file in the CDN server, and when a canvas loads the cross-domain picture, the script file is actually loaded, and then a new embedded image is created by using the script file and drawn to a predetermined region of the canvas, thereby ensuring that the canvas can export the picture normally when the canvas loads the cross-domain picture. On one hand, the cross-domain picture export method is simple in configuration and low in cost; on the other hand, the picture to be loaded is stored in the CDN server in a domain different from the site where the canvas is located, so that the load of the site server side is not increased, and the method has good adaptability to the site with large user access flow.
In this example embodiment, the target format may include a Base64 format, the script file may include a JavaScript script file, and the target picture may include a bitmap picture.
The cross-domain picture derivation apparatus according to the present exemplary embodiment will be described in detail below.
The picture conversion module 11 may include:
a picture conversion unit for converting an original picture into a target format such as Base64 format;
the data processing unit is used for inputting the target format into a script file such as a JavaScript script file in a mode of key values; the data processing unit can store data in a hash table mode;
and the data uploading unit is used for storing the script file to the CDN server.
The image creation module 12 may include:
the data loading unit is used for loading script files such as JavaScript script files in the CDN server;
the data judging unit is used for judging whether the loading task fails according to an error event (namely an onerror event) and/or judging whether the loading task is completed according to loading time (namely onload time);
the image creating unit is used for creating an embedded image according to the script file, such as a JavaScript script file; wherein the embedded Image may be created by an Image object of HTML.
The picture derivation module 13 may include:
the picture drawing unit is used for drawing the embedded image to a preset region of a canvas;
a picture export unit, configured to export a visual area corresponding to the canvas predetermined area as a target picture, for example, a bitmap picture, in a toDataURL manner; the visible area is an area in which the embedded image is drawn in the preset area of the canvas.
It should be noted that: the specific details of each module unit in the device 10 for deriving a cross-domain picture have been described in detail in the corresponding method for deriving a cross-domain picture, and are not described herein again.
It should be noted that although in the above detailed description several modules or units of the device for action execution are mentioned, such a division is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit, according to embodiments of the present disclosure. Conversely, the features and functions of one module or unit described above may be further divided into embodiments by a plurality of modules or units.
Moreover, although the steps of the methods of the present disclosure are depicted in the drawings in a particular order, this does not require or imply that the steps must be performed in this particular order, or that all of the depicted steps must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions, etc.
Also presented in this example embodiment is a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described method of deriving a cross-domain picture.
A computer readable storage medium may include a propagated data signal with readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable storage medium may transmit, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied in a computer readable storage medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
The present exemplary embodiment also proposes an electronic device, and as shown in fig. 6, the electronic device 100 includes: the processing component 101, which may further include one or more processors, and memory resources, represented by memory 102, for storing instructions, such as application programs, that are executable by the processing component 101. The application programs stored in memory 102 may include one or more modules that each correspond to a set of instructions. Furthermore, the processing component 101 is configured to execute instructions to perform the above-described cross-domain picture derivation method.
The electronic device 100 may further include: a power component configured to power manage the performing electronic device 100; a wired or wireless network interface 103 configured to connect the electronic device 100 to a network; and an input/output (I/O) interface 104. The electronic device 100 may operate based on an operating system stored in the memory 102, such as Windows Server, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM, or the like.
Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein may be implemented by software, or by software in combination with necessary hardware. Therefore, the technical solution according to the embodiments of the present disclosure may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a usb disk, a removable hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which may be a personal computer, a server, a mobile terminal, or a network device, etc.) to execute the method according to the embodiments of the present disclosure.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
Claims (8)
1. A cross-domain picture export method is applied to canvas export cross-domain pictures; the derivation method is characterized by comprising the following steps:
converting an original picture into a Base64 format, inputting the Base64 format into a script file in a key value mode, and storing the script file to a content distribution network server in a form of the script file; wherein the script file comprises a JavaScript script file encoded in the Base64 format;
loading a script file in the content distribution network server and acquiring necessary data through a key according to the script file so as to create an embedded Image according to the picture data by using an Image function of HTML;
and drawing the embedded image to a preset region of the canvas by using a drawImage function of the canvas, and exporting a visual region corresponding to the preset region of the canvas as a target picture by using a TODataURL function of the canvas.
2. The exporting method according to claim 1, wherein the storing to the content distribution network server in the form of the script file comprises:
inputting the target format into a script file in a mode of key values;
and storing the script file to the content distribution network server.
3. The exporting method according to claim 2, wherein the keyed entry of the Base64 format into a script file comprises:
and storing in a hash table mode.
4. The exporting method according to claim 1, wherein the loading the script file in the content distribution network server comprises:
judging whether the loading task fails according to the error event; and/or the presence of a gas in the gas,
and judging whether the loading task is completed or not according to the loading time.
5. The derivation method according to any of claims 1 to 4, wherein the target picture comprises a bitmap picture.
6. A cross-domain picture exporting device is applied to canvas to export a cross-domain picture; characterized in that said deriving means comprises:
the picture conversion module is used for converting the original picture into a Base64 format, inputting the Base64 format into a script file in a key value mode, and storing the script file to a content distribution network server in a form of the script file; wherein the script file comprises a JavaScript script file encoded in the Base64 format;
the Image creating module is used for loading a script file in the content distribution network server and acquiring picture data through a key according to the script file so as to create an embedded Image according to the picture data by utilizing an Image function of HTML (hypertext markup language);
and the picture export module is used for drawing the embedded image to a preset region of the canvas by using a drawImage function of the canvas, and exporting a visual region corresponding to the preset region of the canvas as a target picture by using a TODataURL function of the canvas.
7. An electronic device, comprising:
a processor; and
a memory for storing executable instructions of the processor;
wherein the processor is configured to perform the cross-domain picture derivation method of any one of claims 1-5 via execution of the executable instructions.
8. A computer-readable storage medium, on which a computer program is stored, wherein the computer program, when executed by a processor, implements the method for deriving a cross-domain picture according to any one of claims 1 to 5.
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