CN107422974B - Handwriting display method and system, storage medium and device based on dual systems - Google Patents

Abstract

The invention relates to a dual-system-based handwriting display method and system, a storage medium and a device. The method includes the following steps: after detecting a touch event, a transparent writing layer of the first system and a writing software of the second system Execute the handwriting drawing operation on the writing interface; read the current display image of the first system from the display buffer area, draw the current display image on the pre-established original image layer, and draw the handwriting on the transparent writing layer Perform color fusion and superposition with the current display image on the original image layer, and update the content after the color fusion and superposition to the display buffer area of the first system as the display screen of the first system; The screen is displayed, and the handwriting on the writing interface is displayed synchronously in the second system.

Description

Handwriting display method and system, storage medium and device based on dual systems

technical field

The present invention relates to the technical field of touch screens, in particular to a dual-system-based handwriting display method and system, storage medium and device.

Background technique

A dual-system display device refers to an electronic device that includes two complete sets of operating systems. For example, the operating system of the dual-system display device may be composed of a main Android system plus other Android systems, or a main Android system plus a Windows system. Generally, the main Android system is called the first system, and the other system is called the second system. .

At present, in a dual-system display device, when displaying the signal of the second system, the display signal of the second system needs to be physically connected to the first system for display through an HDMI (High Definition Multimedia Interface) cable. Output: After the first system receives the signal from the second system, HDMI decodes and displays it, and a frame of the second system needs to undergo HMDI encoding, transmission, and HDMI decoding before it can be presented to the user.

In order to reduce the transmission delay, one way is to create a transparent writing layer in the first system, and write simultaneously in the first system and the second system. However, in this solution, the handwriting of the first system easily scratches the windows and buttons of non-writing applications on the transparent writing layer of the first system, as shown in FIG. 1 .

To sum up, the traditional dual-system-based writing method has poor writing effect.

SUMMARY OF THE INVENTION

Based on this, it is necessary to provide a dual-system-based handwriting display method and system, a storage medium, and a device for the problem of poor writing effect in the traditional dual-system-based writing method.

A dual-system-based handwriting display method, comprising the following steps:

After the touch event is detected, the handwriting drawing operation is performed on the transparent writing layer of the first system and the writing interface of the writing software of the second system respectively;

The current display image of the first system is read from the display buffer area, and the current display image is drawn on the pre-established original image layer, and the handwriting on the transparent writing layer and the original image layer are drawn. The currently displayed image is subjected to color fusion and superposition, and the content after the color fusion and superposition is updated to the display buffer of the first system as a display screen of the first system;

The display screen is displayed in the first system, and the handwriting on the writing interface is synchronously displayed in the second system.

A dual-system-based handwriting display system, comprising:

a first drawing module, configured to perform handwriting drawing operations on the transparent writing layer of the first system and the writing interface of the writing software of the second system respectively after detecting the touch event;

The second drawing module is configured to read the current display image of the first system from the display buffer area, draw the current display image on the pre-established original image layer, and draw the handwriting on the transparent writing layer and the The current display image on the original image layer is subjected to color fusion and superposition, and the content after the color fusion and superposition is updated to the display buffer area of the first system as a display screen of the first system;

The display module is used for displaying the display screen in the first system, and synchronously displaying the handwriting on the writing interface in the second system.

A computer-readable storage medium on which a computer program is stored, when the program is executed by a processor, implements a dual-system-based handwriting display method.

A computer device includes a memory, a processor, and a computer program stored in the memory and running on the processor, and the processor implements a dual-system-based handwriting display method when executing the program.

The above-mentioned dual-system-based handwriting display method and system, storage medium and device, by establishing a transparent writing layer and an original image layer in the first system, the handwriting is drawn on the transparent writing layer, and the currently displayed image on the transparent writing layer is simultaneously displayed. It is drawn on the original image layer, and then the handwriting on the transparent writing layer and the currently displayed image on the original image layer are fused and superimposed as the display screen of the first system, and finally displayed in the two systems synchronously, thus avoiding the handwriting. Scratched windows and buttons in the display image to improve the display.

Description of drawings

1 is a schematic diagram of a window and a button of a handwriting scratching non-writing application according to one embodiment;

2 is a flowchart of a dual-system-based handwriting display method according to an embodiment;

FIG. 3 is a schematic diagram of display content of a first system according to an embodiment;

FIG. 4 is a schematic diagram of display content of a second system according to an embodiment;

FIG. 5 is a schematic diagram of the final display content after the display content of the first system and the display content of the second system are superimposed according to an embodiment;

6 is a schematic diagram of a handwriting drawing result of the second system according to one embodiment;

7 is a schematic diagram of a handwriting drawing result of a transparent layer writing layer according to an embodiment;

8 is a schematic diagram of a first layer and a second layer performing color fusion and superposition to form the display content of the first system according to an embodiment;

9 is a schematic diagram of display content after the first system and the second system are superimposed and displayed according to an embodiment;

FIG. 10 is a schematic structural diagram of a dual-system-based handwriting display system according to an embodiment.

Detailed ways

The technical solutions of the present invention will be described below with reference to the accompanying drawings.

First, the principle of handwriting drawing based on the dual system will be explained. In order to reduce the transmission delay, one way is to create a transparent writing layer in the first system, and write simultaneously in the first system and the second system. In this solution, when the writing software of the second system is started, a start instruction is sent to the first system through the second system, and the transparent writing layer is started in the first system according to the start instruction; according to the detected touch event, on the transparent writing layer Execute the handwriting drawing operation to obtain the first handwriting, and display the first handwriting on the transparent writing layer; perform the handwriting drawing operation on the writing interface of the writing software according to the touch event, obtain the second handwriting, and display the second handwriting on the first handwriting. On the writing layer of the second system; after detecting the end of the touch event, if the handwriting drawing operation on the writing software is completed, the first handwriting is erased.

In one embodiment, the first system may be an operating system such as an Android system, an IOS system, or a Windows system, and the second system may also be one of the foregoing systems. In a typical embodiment, the first system and the second system may both be Android systems. The writing software of the second system is the writing software installed in the second system. When handwriting is drawn by the writing software of the second system, the handwriting display process needs to go through HMDI encoding, transmission and HDMI decoding before it can be displayed. In order to speed up the display of handwriting, when the writing software of the second system is started, a start-up instruction can be sent to the first system through the second system, and a transparent writing layer is started in the first system. Since the writing software of the second system is activated first and the transparent writing layer is activated later, the transparent writing layer will cover the writing software of the second system. Moreover, since the first system starts the transparent writing layer, that is, its background is transparent, the user cannot perceive the existence of the transparent writing layer of the first system, nor the starting process.

The above solution has a problem, that is, the handwriting of the first system is easy to scratch the windows and buttons of non-writing applications on the transparent writing layer of the first system, as shown in Figure 1, the white thin line in the figure is handwriting, it can be seen that The first "0" and "05" in the number "00" and the part where the handwriting line intersects are both incomplete. In order to solve the above problems, the present invention provides a dual-system-based handwriting display method, as shown in FIG. 2 , which may include the following steps:

S1, after detecting the touch event, perform handwriting drawing operations on the transparent writing layer of the first system and the writing interface of the writing software of the second system respectively;

In one embodiment, there may be one or more icons on the transparent writing layer of the first system, for example, a timer icon, and the display layer screen is shown in FIG. 3 . In another embodiment, the writing interface of the writing software of the second system is shown in FIG. 4 , including a writing area, and several icons may be set on the writing interface for performing related non-writing operations. Functions include, but are not limited to, one or more of interactive operations with menus, toolbars, and/or palettes, undo handwriting operations, cancel undo operations, and screenshot operations. The final display content after superimposing the display content of the first system and the display content of the second system corresponding to the above two embodiments is shown in FIG. 5 .

In this step, a touch event initiation instruction issued by the system may be detected, and if detected, it is determined that a touch event occurs. Taking the Android system as an example, when the ACTION_DOWN instruction issued by the system is detected, it can be determined that a touch event occurs, and then the handwriting drawing operation is performed in the first system and the second system respectively.

S2, read the current display image of the first system from the display buffer area, draw the current display image on the pre-established original image layer, and combine the handwriting on the transparent writing layer with the original image layer Perform color fusion and superposition on the currently displayed image on the screen, and update the content after the color fusion and superposition to the display buffer area of the first system as the display screen of the first system;

When drawing handwriting in the first system, in order to avoid scratching buttons and windows of other applications, a layered drawing method can be adopted in the first system: the first layer is the original image layer, which is used to draw buttons of other applications and the current display image of the window in the display buffer area, the current display image may include the icon on the transparent writing layer of the first system and the image of the window. The second layer is a transparent writing layer for drawing handwriting. In one embodiment, when the writing software of the second system is started, a software start command may be sent to the first system through the second system; the writing software of the first system may be started in response to the software start command; The software creates an original image layer and a transparent writing layer in the first system.

Each time you draw, first read the currently displayed image in the display buffer area as the first layer, and use the currently drawn handwriting as the second layer; after the current display image of the first layer and the handwriting of the second layer are color fused and superimposed. The obtained content is updated to the display buffer area of the first system, and is collectively used as the display content of the first system.

S3: Display the handwriting on the transparent writing layer and the currently displayed image on the transparent writing layer, and display the handwriting on the writing interface on the writing interface.

In one embodiment, the size of the display buffer area is the display resolution size of the system, the display refresh rate of the display device can be displayed, and according to the display refresh rate, the display image is directly read from the display buffer area, and the first system This display screen is displayed.

Further, in one embodiment, before displaying, a handwriting color setting instruction can be sent to the first system through the second system, and the handwriting color setting instruction can carry the current display color of the handwriting of the second system. The handwriting color setting dictates the handwriting color on the transparent writing layer. Further, the first system can also render the handwriting on the transparent writing layer according to the current display color; the rendered handwriting and the currently displayed image on the original image layer are subjected to color fusion and superposition as the Display content on transparent writing layer. The process of setting the handwriting color can also be performed when the writing software of the second system is started, that is, when it is detected that the writing software of the second system is started, a handwriting color setting instruction is sent to the first system through the second system. In this way, the first system and the second system can keep handwriting color synchronized.

Further, in another embodiment, before displaying, a handwriting line setting instruction can also be sent to the first system through the second system, and the handwriting line setting instruction can carry the currently displayed line type of the handwriting of the second system, including but Not limited to one or more of line thickness, line style (solid or dashed), line endpoints (no endpoints, endpoints at the beginning of the line or endpoints at the end of the line, and/or endpoint type, etc.). Further, the first system can set the line type of the handwriting on the transparent writing layer according to the currently displayed line type; the set handwriting and the currently displayed image on the original image layer are subjected to color fusion and superposition as the Describe the display content on the transparent writing layer. The process of setting the handwriting lines can also be performed when the writing software of the second system is started, that is, when it is detected that the writing software of the second system is started, a handwriting line setting instruction is sent to the first system through the second system. In this way, the first system and the second system can be kept in sync with the stroke type.

For ease of understanding, reference is made to FIGS. 6 to 9 . FIG. 6 is a schematic diagram of handwriting on the writing interface of the second system. After detecting the writing software start-up instruction, the second system can send a start-up command to the first system to start the transparent writing layer of the first system. After the second system starts to draw, the first system performs synchronous drawing on the transparent writing layer, as shown in FIG. 7 . At the same time, the first system can read the currently displayed image on the transparent writing layer from the display buffer area, and draw it on the original image layer, and the first layer and the second layer are fused and superimposed to form the display content of the first system, As shown in Figure 8. Finally, the result after the display content of the first system ( FIG. 8 ) and the display content of the second system ( FIG. 6 ) are superimposed and displayed is shown in FIG. 9 . It can be seen that by adopting the method of layered drawing in the first system, the handwriting of the first system is at the lower layer of the display content of the icon and the window, and the icon and the window will not be scratched.

In a further embodiment, when the second system finishes handwriting drawing, a handwriting drawing termination command can be sent to the first system through the second system; the handwriting drawing operation of the first system is stopped in response to the handwriting drawing termination command, and the handwriting on the transparent writing layer. In practical applications, it can be determined whether the touch event ends by detecting the touch event end instruction. When the touch event ending instruction is detected, it can be determined that the touch event has ended, and then a handwriting drawing termination command is sent to the first system; otherwise, it is determined that the touch event has not ended. Taking the Android system as an example, the ACTION_UP event can be detected, and if detected, it can be determined that the touch event has ended, otherwise, it can be determined that the touch event has not ended.

In a further embodiment, when the second system exits the whiteboard writing software, an exit command may be sent to the first system through the second system; the original image layer of the first system is closed in response to the exit command.

In the above-mentioned dual-system-based handwriting display method, by establishing a transparent writing layer and an original image layer in the first system, the handwriting is drawn on the transparent writing layer, and the currently displayed image on the transparent writing layer is drawn on the original image layer at the same time, Finally, the handwriting on the transparent writing layer and the currently displayed image are displayed on the transparent writing layer, and the handwriting on the writing interface is displayed on the writing interface, thereby preventing the handwriting from scratching the windows and buttons in the displayed image, Improved display.

As shown in Figure 10, the present invention also provides a dual-system-based handwriting display system, which may include:

The first drawing module 10 is configured to perform handwriting drawing operations on the transparent writing layer of the first system and the writing interface of the writing software of the second system respectively after the touch event is detected;

In one embodiment, the transparent writing layer of the first system is transparent except for the side buttons, and there may be one or more icons on the transparent writing layer of the first system, for example, a timer icon, The display hierarchy screen is shown in Figure 3. In another embodiment, the writing interface of the writing software of the second system is shown in FIG. 4 , including a writing area, and several icons may be set on the writing interface for performing related non-writing operations. Functions include, but are not limited to, one or more of interactive operations with menus, toolbars, and/or palettes, undo handwriting operations, cancel undo operations, and screenshot operations. The final display content after superimposing the display content of the first system and the display content of the second system corresponding to the above two embodiments is shown in FIG. 5 .

In this module, the touch event start command issued by the system can be detected, and if detected, it is determined that a touch event occurs. Taking the Android system as an example, when the ACTION_DOWN instruction issued by the system is detected, it can be determined that a touch event occurs, and then the handwriting drawing operation is performed in the first system and the second system respectively.

The second drawing module 20 is configured to read the current display image of the first system from the display buffer area, draw the current display image on the pre-established original image layer, and draw the handwriting on the transparent writing layer Perform color fusion and superposition with the current display image on the original image layer, and update the content after the color fusion and superposition to the display buffer area of the first system, as the display screen of the first system;

When drawing handwriting in the first system, in order to avoid scratching buttons and windows of other applications, a layered drawing method can be adopted in the first system: the first layer is the original image layer, which is used to draw buttons of other applications and the current display image of the window in the display buffer area, the current display image may include the icon on the transparent writing layer of the first system and the image of the window. The second layer is a transparent writing layer for drawing handwriting. In one embodiment, when the writing software of the second system is started, a software start command may be sent to the first system through the second system; the writing software of the first system may be started in response to the software start command; The software creates an original image layer and a transparent writing layer in the first system.

Each time you draw, first read the currently displayed image in the display buffer area as the first layer, and use the currently drawn handwriting as the second layer; after the current display image of the first layer and the handwriting of the second layer are color fused and superimposed. The obtained content is updated to the display buffer area of the first system, and is collectively used as the display content of the first system.

The display module 30 is configured to display the handwriting on the transparent writing layer and the currently displayed image on the transparent writing layer, and display the handwriting on the writing interface on the writing interface.

In one embodiment, the size of the display buffer area is the display resolution size of the system, the display refresh rate of the display device can be displayed, and according to the display refresh rate, the display image is directly read from the display buffer area, and the first system This display screen is displayed.

Further, in one embodiment, before displaying, a handwriting color setting instruction can be sent to the first system through the second system, and the handwriting color setting instruction can carry the current display color of the handwriting of the second system. The handwriting color setting dictates the handwriting color on the transparent writing layer. Further, the first system can also render the handwriting on the transparent writing layer according to the current display color; the rendered handwriting and the currently displayed image on the original image layer are subjected to color fusion and superposition as the Display content on transparent writing layer. The process of setting the handwriting color can also be performed when the writing software of the second system is started, that is, when it is detected that the writing software of the second system is started, a handwriting color setting instruction is sent to the first system through the second system. In this way, the first system and the second system can keep handwriting color synchronized.

Further, in another embodiment, before displaying, a handwriting line setting instruction can also be sent to the first system through the second system, and the handwriting line setting instruction can carry the currently displayed line type of the handwriting of the second system, including but Not limited to one or more of line thickness, line style (solid or dashed), line endpoints (no endpoints, endpoints at the beginning of the line or endpoints at the end of the line, and/or endpoint type, etc.). Further, the first system can set the line type of the handwriting on the transparent writing layer according to the currently displayed line type; the set handwriting and the currently displayed image on the original image layer are subjected to color fusion and superposition as the Describe the display content on the transparent writing layer. The process of setting the handwriting lines can also be performed when the writing software of the second system is started, that is, when it is detected that the writing software of the second system is started, a handwriting line setting instruction is sent to the first system through the second system. In this way, the first system and the second system can be kept in sync with the stroke type.

For ease of understanding, reference is made to FIGS. 6 to 9 . FIG. 6 is a schematic diagram of handwriting on the writing interface of the second system. After detecting the writing software start-up instruction, the second system can send a start-up command to the first system to start the transparent writing layer of the first system. After the second system starts to draw, the first system performs synchronous drawing on the transparent writing layer, as shown in FIG. 7 . At the same time, the first system can read the currently displayed image on the transparent writing layer from the display buffer area, and draw it on the original image layer, and the first layer and the second layer are fused and superimposed to form the display content of the first system, As shown in Figure 8. Finally, the result after the display content of the first system ( FIG. 8 ) and the display content of the second system ( FIG. 6 ) are superimposed and displayed is shown in FIG. 9 . It can be seen that by adopting the method of layered drawing in the first system, the handwriting of the first system is at the lower layer of the display content of the icon and the window, and the icon and the window will not be scratched.

In a further embodiment, when the second system finishes handwriting drawing, a handwriting drawing termination command can be sent to the first system through the second system; the handwriting drawing operation of the first system is stopped in response to the handwriting drawing termination command, and the handwriting on the transparent writing layer. In practical applications, it can be determined whether the touch event ends by detecting the touch event end instruction. When the touch event ending instruction is detected, it can be determined that the touch event has ended, and then a handwriting drawing termination command is sent to the first system; otherwise, it is determined that the touch event has not ended. Taking the Android system as an example, the ACTION_UP event can be detected, and if detected, it can be determined that the touch event has ended, otherwise, it can be determined that the touch event has not ended.

In a further embodiment, when the second system exits the whiteboard writing software, an exit command may be sent to the first system through the second system; the original image layer of the first system is closed in response to the exit command.

In the above-mentioned dual-system-based handwriting display system, by establishing a transparent writing layer and an original image layer in the first system, the handwriting is drawn on the transparent writing layer, and the currently displayed image on the transparent writing layer is drawn on the original image layer at the same time, Finally, the handwriting on the transparent writing layer and the currently displayed image are displayed on the transparent writing layer, and the handwriting on the writing interface is displayed on the writing interface, thereby preventing the handwriting from scratching the windows and buttons in the displayed image, Improved display.

The dual-system-based handwriting display system of the present invention corresponds to the dual-system-based handwriting display method of the present invention, and the technical features and beneficial effects described in the embodiments of the dual-system-based handwriting display method are all applicable In the embodiment of the dual system based handwriting display system, it is hereby stated.

Further, the present invention also provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, implements the dual-system-based handwriting display method in any of the foregoing embodiments.

The embodiments of the method executed by the computer-readable storage medium are the same as the other embodiments of the above-mentioned dual-system-based handwriting display method, which will not be repeated here.

Further, the present invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and running on the processor, the processor implementing the program based on any of the above embodiments when the processor executes the program. A dual-system handwriting display method.

The embodiments of the method executed by the processor of the computer device are the same as the other embodiments of the above-mentioned dual-system-based handwriting display method, which will not be repeated here.

The logic and/or steps represented in flowcharts or otherwise described herein, for example, may be considered an ordered listing of executable instructions for implementing the logical functions, may be embodied in any computer-readable medium, For use with, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other system that can fetch instructions from and execute instructions from an instruction execution system, apparatus, or apparatus) or equipment. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport the program for use by or in connection with an instruction execution system, apparatus, or apparatus.

More specific examples (non-exhaustive list) of computer readable media include the following: electrical connections with one or more wiring (electronic devices), portable computer disk cartridges (magnetic devices), random access memory (RAM), Read Only Memory (ROM), Erasable Editable Read Only Memory (EPROM or Flash Memory), Fiber Optic Devices, and Portable Compact Disc Read Only Memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program may be printed, as the paper or other medium may be optically scanned, for example, followed by editing, interpretation, or other suitable medium as necessary process to obtain the program electronically and then store it in computer memory.

It should be understood that various parts of the present invention may be implemented in hardware, software, firmware or a combination thereof. In the above-described embodiments, various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented by any one or a combination of the following techniques known in the art: Discrete logic circuits, application specific integrated circuits with suitable combinational logic gates, Programmable Gate Arrays (PGA), Field Programmable Gate Arrays (FPGA), etc.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims (10)

1. a handwriting display method based on dual systems, is characterized in that, comprises the following steps: After detecting the touch event of the first system or the second system, the handwriting drawing operation is performed on the transparent writing layer of the first system and the writing interface of the writing software of the second system respectively; The current display image of the first system is read from the display buffer area, and the current display image is drawn on the pre-established original image layer, and the handwriting on the transparent writing layer and the original image layer are drawn. The currently displayed image is subjected to color fusion and superposition, and the content after the color fusion and superposition is updated to the display buffer of the first system as a display screen of the first system; The display screen is displayed in the first system, and the handwriting on the writing interface is synchronously displayed in the second system. 2. The method for displaying handwriting based on dual systems according to claim 1, wherein the step of displaying the display screen in the first system comprises: Get the display refresh rate of the display device; Reading the display image from the display buffer area according to the display refresh rate; The display screen is displayed in the first system. 3. handwriting display method based on dual system according to claim 1, is characterized in that, also comprises the following steps: When the second system ends the handwriting drawing, sending a handwriting drawing termination command to the first system through the second system; Stop the handwriting drawing operation of the first system in response to the handwriting drawing termination command, and clear the handwriting on the transparent writing layer. 4. handwriting display method based on dual system according to claim 1, is characterized in that, also comprises the following steps: When the second system exits the whiteboard writing software, sending an exit command to the first system through the second system; The original image layer of the first system is closed in response to the exit command. 5. The handwriting display method based on dual system according to claim 1, is characterized in that, also comprises the following steps: When the writing software of the second system is started, send a software start command to the first system through the second system; Start the writing software of the first system in response to the software start command; The original image layer and the transparent writing layer are newly created in the first system through the writing software of the first system. 6. The dual-system-based handwriting display method according to any one of claims 1 to 5, wherein color fusion is performed on the handwriting on the transparent writing layer and the currently displayed image on the original image layer The steps of stacking include: Send a handwriting color setting instruction to the first system through the second system, where the handwriting color setting instruction carries the current display color of the handwriting on the writing interface; rendering the handwriting on the transparent writing layer according to the current display color; Perform color fusion and superposition on the rendered handwriting and the currently displayed image on the original image layer. 7 . The method for displaying handwriting based on dual systems according to claim 6 , wherein the step of performing color fusion and superimposition on the handwriting on the transparent writing layer and the currently displayed image on the original image layer further comprises: 8 . : Send a handwriting line setting instruction to the first system through the second system, where the handwriting line setting instruction carries the currently displayed line type of the handwriting on the writing interface; Setting the line type of the handwriting on the transparent writing layer according to the currently displayed line type; Perform color fusion and superposition on the set handwriting and the currently displayed image on the original image layer. 8. A handwriting display system based on dual systems, characterized in that, comprising: a first drawing module, configured to perform handwriting drawing operations on the transparent writing layer of the first system and the writing interface of the writing software of the second system respectively after detecting the touch event of the first system or the second system; The second drawing module is configured to read the current display image of the first system from the display buffer area, draw the current display image on the pre-established original image layer, and draw the handwriting on the transparent writing layer and the The current display image on the original image layer is subjected to color fusion and superposition, and the content after the color fusion and superposition is updated to the display buffer area of the first system as a display screen of the first system; The display module is used for displaying the display screen in the first system, and synchronously displaying the handwriting on the writing interface in the second system. 9 . A computer-readable storage medium on which a computer program is stored, wherein when the program is executed by a processor, the dual-system-based handwriting display method according to any one of claims 1 to 7 is implemented. 10 . 10. A computer device comprising a memory, a processor and a computer program stored on the memory and running on the processor, wherein the processor implements any one of claims 1 to 7 when executing the program The dual-system-based handwriting display method.

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