CN105047181A - Method and device for displaying characters - Google Patents

Abstract

The embodiment of the present invention discloses a method and device for displaying characters, which obtains encoding information of characters to be displayed, wherein the encoding information includes Unicode encoding; determines whether the characters to be displayed are in pre-stored encoding information according to the encoding information; if so, directly obtains contour information of the characters to be displayed from the pre-stored encoding information, draws character graphics according to the contour information and displays the characters to be displayed, thereby comprehensively improving the display speed of vector fonts, effectively improving the system operation speed, and improving the user experience; and can save system resources, effectively save power, and provide longer battery life.

Description

A method and device for displaying characters

technical field

Embodiments of the present invention relate to the technical field of mobile terminals, and in particular to a method and device for displaying characters.

Background technique

With the development and application of embedded systems, the use of high-quality fonts in embedded systems has become an industry trend. Efficiently displaying beautiful and generous fonts has become the current market demand, especially for communication devices that are closely related to people's lives middle.

Dot-matrix fonts divide each character into 16×16 or 24×24 dots, and then use the virtual reality of each dot to represent the outline of the character. Bitmap fonts are also called bitmap fonts, in which each glyph is represented by a set of two-dimensional pixel information. The advantage of dot matrix fonts is that the display speed is fast, unlike vector fonts that require complex calculations. However, due to the limitations of the dot matrix font itself, it is difficult to scale the dot matrix font, and the specific dot matrix font can only be clearly displayed in the corresponding font size, otherwise the text will only be forcibly enlarged and the font will be distorted, resulting in a mosaic jagged edge . Each glyph in a vector font (Vectorfont) is described by a mathematical curve, which contains key points on the glyph boundary, derivative information of the connection, etc., and the rendering engine of the font reads these mathematical vectors, and then performs certain mathematics operation for rendering. The advantage of this type of font is that the actual size of the font can be scaled arbitrarily without deformation or color change, and operations such as rotation and tilting of the font can be realized, which facilitates the realization of "what you see and what you get". Vector fonts mainly include Type1, TrueType, OpenType and other categories. However, when vector fonts generate fonts, font description information needs to be extracted to obtain fonts through a large number of calculations through mathematical models. First, for dot matrix fonts, the display speed is very slow.

The current method is the conventional method of vector fonts. First extract the outline information of the character, then calculate the font of the character, and then output it to the screen; this method will affect the efficiency of the display, and the useful character information is not prepared in advance, such as Talk about the width and height information of characters; if you want to use it to read from the font library, it is very time-consuming; another example: every time a character is drawn, it reads the relevant information through the file system to the font library; and through the file It is very slow for the system to read character information; greatly reducing efficiency.

Contents of the invention

The purpose of the embodiments of the present invention is to provide a method and device for displaying characters, aiming at solving the problem of how to improve the display speed of vector fonts.

To achieve this purpose, the embodiments of the present invention adopt the following technical solutions:

A method of displaying characters, the method comprising:

Obtain encoding information of characters to be displayed, where the encoding information includes Unicode encoding;

determining whether the character to be displayed is in pre-stored encoding information according to the encoding information;

If so, directly obtain the outline information of the character to be displayed from the pre-stored coding information, draw a character graphic according to the outline information, and display the character to be displayed.

Preferably, the determining whether the character to be displayed is in the pre-stored encoding information according to the encoding information includes:

According to the Unicode encoding of the character to be displayed, it is determined whether the Unicode encoding of the character to be displayed is in the pre-stored Unicode encoding, and whether the font size of the character to be displayed is within the range of the pre-stored font size.

Preferably, the directly obtaining the outline information of the character to be displayed from the pre-stored coding information, drawing a character graphic according to the outline information and displaying the character to be displayed includes:

If it is determined that the Unicode code of the character to be displayed is in the pre-stored Unicode code, and the font size of the character to be displayed is also within the range of the font size stored in advance, drawing a character graphic through GDI and displaying the character to be displayed.

Preferably, before or after obtaining the encoding information of the characters to be displayed, the method further includes:

Pre-store the Unicode encoding of commonly used characters and the outline information of commonly used characters.

Preferably, the method also includes:

The width information of the font is stored in advance.

A device for displaying characters, the device comprising:

An acquisition module, configured to acquire encoding information of characters to be displayed, where the encoding information includes Unicode encoding;

A determination module, configured to determine whether the character to be displayed is in the pre-stored encoding information according to the encoding information;

The display module is configured to directly obtain the outline information of the character to be displayed from the pre-stored coding information, draw a character graphic according to the outline information, and display the character to be displayed if so.

Preferably, the determination module includes:

The determining unit is configured to determine whether the Unicode encoding of the character to be displayed is in the pre-stored Unicode encoding and whether the font size of the character to be displayed is within the range of the pre-stored font size according to the Unicode encoding of the character to be displayed.

Preferably, the display module includes:

The display unit is used to draw a character graphic through GDI and display the Unicode code of the character to be displayed if it is determined that the Unicode code of the character to be displayed is in the pre-stored Unicode code, and the font size of the character to be displayed is also within the range of the font size stored in advance. Describes the characters to be displayed.

Preferably, the device also includes:

The first storage module is used for pre-storing Unicode codes of common characters and outline information of common characters.

Preferably, the device also includes:

The second storage module is used for pre-storing the width information of the font.

In the embodiment of the present invention, by acquiring the encoding information of the character to be displayed, the encoding information includes Unicode encoding; determining whether the character to be displayed is in the pre-stored encoding information according to the encoding information; if so, directly from the pre-stored encoding Obtain the outline information of the character to be displayed in the information, draw character graphics according to the outline information and display the character to be displayed, thereby comprehensively improving the display speed of the vector font, effectively improving the system operating speed, and improving user experience; and saving System resources, effectively saving power and providing longer battery life.

Description of drawings

FIG. 1 is a schematic flowchart of a first embodiment of a method for displaying characters in an embodiment of the present invention;

FIG. 2 is a schematic flowchart of a second embodiment of a method for displaying characters according to an embodiment of the present invention;

FIG. 3 is a schematic flowchart of a third embodiment of a method for displaying characters according to an embodiment of the present invention;

4 is a schematic diagram of functional modules of a device for displaying characters according to an embodiment of the present invention;

Fig. 5 is a schematic diagram of functional modules of a determination module according to an embodiment of the present invention;

6 is a schematic diagram of functional modules of a display module according to an embodiment of the present invention;

7 is a schematic diagram of functional modules of a device for displaying characters according to an embodiment of the present invention;

Fig. 8 is a schematic diagram of functional modules of the device for displaying characters according to an embodiment of the present invention.

Detailed ways

The embodiments of the present invention will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the embodiments of the present invention, rather than to limit the embodiments of the present invention. In addition, it should be noted that, for the convenience of description, the drawings only show some but not all structures related to the embodiments of the present invention.

Embodiment one

Referring to the drawings, FIG. 1 is a schematic flowchart of a first embodiment of a method for displaying characters according to an embodiment of the present invention.

In Embodiment 1, the method for displaying characters includes:

Step 101, acquiring encoding information of characters to be displayed, said encoding information including Unicode encoding;

Step 102, determining whether the character to be displayed is in the pre-stored encoding information according to the encoding information;

Preferably, the determining whether the character to be displayed is in the pre-stored encoding information according to the encoding information includes:

According to the Unicode encoding of the character to be displayed, it is determined whether the Unicode encoding of the character to be displayed is in the pre-stored Unicode encoding, and whether the font size of the character to be displayed is within the range of the pre-stored font size.

Specifically, in many embedded devices, such as learning machines and dictionary machines, there are a lot of uncommon characters and characters to be displayed. Making a relatively complete font library has about 40,000 to 50,000 Chinese characters or characters, resulting in the entire font library The file is very large, generally more than 15M; due to the limitation of the memory size of the system, the font file cannot be loaded into the memory at one time. The traditional method is to read to obtain Chinese characters or character outline information and then calculate the font to display Chinese characters. If we use PC-side tools to extract the outline information of commonly used Chinese characters and common symbols to save the file, and load this file into the memory at one time when the system is loaded, directly operating the memory is many times faster than reading font files. For example, extract the outline information of commonly used Chinese characters GBK2312 codes and common symbols (about 7000 in total), and the saved file size is about 1.6M. In the memory, the storage form of the commonly used Chinese characters GBK2312 codes is stored in the form of Unicode codes , for the GBK2312 encoding of each Chinese character, there is a Unicode encoding corresponding to it.

Specifically, if most of the displayed content is English characters, even if it is optimized through the second point above, it still feels a bit slow. For example, in this case (reading English e-books or English dictionaries): screen comparison Large, the font size is relatively small, and most of the characters displayed are English characters or all of them, and the number of characters displayed on one screen reaches thousands; even if the calculation of a single font is fast, but there are too many characters to display, the cumulative display time will change. It's long, here is mainly to consume the time to calculate the font based on the character outline information. If we use the tools on the PC side to set the uppercase and lowercase characters and common symbols of English characters to about 128 (ASCII encoding), mainly save the font information of English characters or symbols with smaller font sizes to a file calculated from the outline information, which is about 2M , when the system is loaded, load this file into the memory at one time. In this case, there is no need to read the outline information of the font, and do not need to calculate the font. It is equivalent to a dot matrix font, and the display speed is faster.

Step 103, if yes, obtain the outline information of the character to be displayed directly from the pre-stored coding information, draw a character graphic according to the outline information, and display the character to be displayed.

Preferably, the directly obtaining the outline information of the character to be displayed from the pre-stored coding information, drawing a character graphic according to the outline information and displaying the character to be displayed includes:

If it is determined that the Unicode code of the character to be displayed is in the pre-stored Unicode code, and the font size of the character to be displayed is also within the range of the font size stored in advance, drawing a character graphic through GDI and displaying the character to be displayed.

Specifically, a. The character width and height information is extracted and stored as a file, and loaded into the memory at one time when the system is started, so that the font information can be obtained less once.

b. Extract the outline information of commonly used characters such as GBK2312 character set and save it as a file, and load it into the memory at one time when the system starts to avoid reading font information. Reading files in the file system is very slow, so it is necessary to improve the speed There is very big help.

c. Convert English characters and common symbols into dot-matrix fonts, save the file format, and load it into the memory at one time when the system is started. The fonts can be displayed through a large number of mathematical calculations, and the display speed is comparable to that of dot-matrix fonts.

In the embodiment of the present invention, by acquiring the encoding information of the character to be displayed, the encoding information includes Unicode encoding; determining whether the character to be displayed is in the pre-stored encoding information according to the encoding information; if so, directly from the pre-stored encoding Obtain the outline information of the character to be displayed in the information, draw character graphics according to the outline information and display the character to be displayed, thereby comprehensively improving the display speed of the vector font, effectively improving the system operating speed, and improving user experience; and saving System resources, effectively saving power and providing longer battery life.

Embodiment two

Referring to FIG. 2 , FIG. 2 is a schematic flowchart of a second embodiment of a method for displaying characters according to an embodiment of the present invention.

On the basis of Embodiment 1, before or after obtaining the encoding information of the characters to be displayed, the method for displaying characters further includes:

Step 104, pre-store the Unicode codes of common characters and the outline information of common characters.

Embodiment three

Referring to FIG. 3 , FIG. 3 is a schematic flowchart of a third embodiment of a method for displaying characters according to an embodiment of the present invention.

On the basis of Embodiment 1, the method for displaying characters further includes:

Step 105, pre-store width information of fonts.

Specifically, when displaying Chinese characters or characters, it is necessary to obtain the width information of each Chinese character or character for pre-typesetting. For example, e-books and the like, the current page is displayed every time it is opened, but at this time the background is quickly obtaining Only by pre-versioning the font width information can we get the current page number and how many pages there are in total. Only in this way can we realize fast page turning. The traditional method is to calculate the width information from the font library based on the Unicode encoding of Chinese characters or characters. In this way, it is too slow to calculate and read information from the font library. The reason is that the reading speed of the file is very slow. up. Therefore, through the processing tool on the PC side, the width information of the font library can be extracted and saved to a file. In order to minimize the file size, the main width information can be extracted according to the needs, such as even numbers from font size 12 to font size 48, which is comprehensive and universal. up. When the system is loaded, the width information file is loaded into the memory, and the memory can be directly read every time the width information is needed, and the speed is greatly improved.

Embodiment four

Referring to FIG. 4 , FIG. 4 is a schematic diagram of functional modules of an apparatus for displaying characters according to an embodiment of the present invention.

In Embodiment 4, the device for displaying characters includes:

An acquisition module 401, configured to acquire encoding information of characters to be displayed, where the encoding information includes Unicode encoding;

A determination module 402, configured to determine whether the character to be displayed is in the pre-stored encoding information according to the encoding information;

Preferably, refer to FIG. 5 , which is a schematic diagram of functional modules of the determination module 402 according to the embodiment of the present invention. The determining module 402 includes:

The determining unit 501 is configured to determine whether the Unicode encoding of the character to be displayed is in the pre-stored Unicode encoding and whether the font size of the character to be displayed is within the pre-stored font size range according to the Unicode encoding of the character to be displayed .

Specifically, in many embedded devices, such as learning machines and dictionary machines, there are a lot of uncommon characters and characters to be displayed. Making a relatively complete font library has about 40,000 to 50,000 Chinese characters or characters, resulting in the entire font library The file is very large, generally more than 15M; due to the limitation of the memory size of the system, the font file cannot be loaded into the memory at one time. The traditional method is to read to obtain Chinese characters or character outline information and then calculate the font to display Chinese characters. If we use PC-side tools to extract the outline information of commonly used Chinese characters and common symbols to save the file, and load this file into the memory at one time when the system is loaded, directly operating the memory is many times faster than reading font files. For example, the outline information of commonly used Chinese characters GBK2312 encoding and commonly used symbols (about 7000 in total) is extracted, and the saved file size is about 1.6M.

Specifically, if most of the displayed content is English characters, even if it is optimized through the second point above, it still feels a bit slow. For example, in this case (reading English e-books or English dictionaries): screen comparison Large, the font size is relatively small, and most of the characters displayed are English characters or all of them, and the number of characters displayed on one screen reaches thousands; even if the calculation of a single font is fast, but there are too many characters to display, the cumulative display time will change. It's long, here is mainly to consume the time to calculate the font based on the character outline information. If we use the tools on the PC side to set the uppercase and lowercase characters and common symbols of English characters to about 128 (ASCII encoding), mainly save the font information of English characters or symbols with smaller font sizes to a file calculated from the outline information, which is about 2M , when the system is loaded, load this file into the memory at one time. In this case, there is no need to read the outline information of the font, and do not need to calculate the font. It is equivalent to a dot matrix font, and the display speed is faster.

The display module 403 is configured to, if yes, obtain the outline information of the character to be displayed directly from the pre-stored coding information, draw a character graphic according to the outline information, and display the character to be displayed.

Preferably, refer to FIG. 6 , which is a schematic diagram of functional modules of the display module 403 according to an embodiment of the present invention. The display module 403 includes:

The display unit 601 is configured to draw a character graphic through GDI if it is determined that the Unicode encoding of the character to be displayed is in the pre-stored Unicode encoding, and the font size of the character to be displayed is also within the range of the pre-stored font size, and display The character to be displayed.

Specifically, a. The character width and height information is extracted and stored as a file, and loaded into the memory at one time when the system is started, so that the font information can be obtained less once.

b. Extract the outline information of commonly used characters such as GBK2312 character set and save it as a file, and load it into the memory at one time when the system starts to avoid reading font information. Reading files in the file system is very slow, so it is necessary to improve the speed There is very big help.

c. Convert English characters and common symbols into dot-matrix fonts, save the file format, and load it into the memory at one time when the system is started. The fonts can be displayed through a large number of mathematical calculations, and the display speed is comparable to that of dot-matrix fonts.

In the embodiment of the present invention, by acquiring the encoding information of the character to be displayed, the encoding information includes Unicode encoding; determining whether the character to be displayed is in the pre-stored encoding information according to the encoding information; if so, directly from the pre-stored encoding Obtain the outline information of the character to be displayed in the information, draw character graphics according to the outline information and display the character to be displayed, thereby comprehensively improving the display speed of the vector font, effectively improving the system operating speed, and improving user experience; and saving System resources, effectively saving power and providing longer battery life.

Embodiment five

Referring to FIG. 7 , FIG. 7 is a schematic diagram of functional modules of an apparatus for displaying characters according to an embodiment of the present invention.

On the basis of embodiment four, the method also includes:

The first storage module 404 is used for pre-storing Unicode codes of common characters and outline information of common characters.

Embodiment six

Referring to FIG. 8 , FIG. 8 is a schematic diagram of functional modules of an apparatus for displaying characters according to an embodiment of the present invention.

On the basis of embodiment four, the method also includes:

The second storage module 405 is used for storing the width information of the font in advance.

Specifically, when displaying Chinese characters or characters, it is necessary to obtain the width information of each Chinese character or character for pre-typesetting. For example, e-books and the like, the current page is displayed every time it is opened, but at this time the background is quickly obtaining Only by pre-versioning the font width information can we get the current page number and how many pages there are in total. Only in this way can we realize fast page turning. The traditional method is to calculate the width information from the font library based on the Unicode encoding of Chinese characters or characters. In this way, it is too slow to calculate and read information from the font library. The reason is that the reading speed of the file is very slow. up. Therefore, through the processing tool on the PC side, the width information of the font library can be extracted and saved to a file. In order to minimize the file size, the main width information can be extracted according to the needs, such as even numbers from font size 12 to font size 48, which is comprehensive and universal. up. When the system is loaded, the width information file is loaded into the memory, and the memory can be directly read every time the width information is needed, and the speed is greatly improved.

The above describes the technical principles of the embodiments of the present invention in conjunction with specific embodiments. These descriptions are only for explaining the principles of the embodiments of the present invention, and cannot be construed as limiting the protection scope of the embodiments of the present invention in any way. Based on the explanations herein, those skilled in the art can think of other specific implementation manners of the embodiments of the present invention without creative work, and these manners will fall within the protection scope of the embodiments of the present invention.

Claims (10)

1. show a method for character, it is characterized in that, described method comprises:

Obtain the coded message of character to be shown, described coded message comprises Unicode coding;

Described character to be shown is determined whether in the coded message prestored according to described coded message;

If so, then obtaining the profile information of described character to be shown the direct coded message from prestoring, drawing character graphics according to described profile information and showing described character to be shown.

2. method according to claim 1, is characterized in that, describedly determines described character to be shown whether in the coded message prestored according to described coded message, comprising:

Unicode according to described character to be shown encodes, and determines that the Unicode coding of described character to be shown is whether in the Unicode coding prestored, and whether the font size of described character to be shown is in the size range prestored.

3. method according to claim 1, is characterized in that, the described profile information directly obtaining described character to be shown from the coded message prestored, and draws character graphics and shows described character to be shown, comprising according to described profile information:

If determine, the Unicode of described character to be shown is coded in the Unicode coding prestored, and the font size of described character to be shown is also in the size range prestored, then draw character graphics by GDI, and shows described character to be shown.

4. the method according to claims 1 to 3 any one, is characterized in that, described method obtain character to be shown coded message before or afterwards, also comprise:

Prestore the Unicode coding of conventional characters and the profile information of conventional characters.

5. the method according to claims 1 to 3 any one, is characterized in that, described method also comprises:

Prestore the width information of character library.

6. show a device for character, it is characterized in that, described device comprises:

Acquisition module, for obtaining the coded message of character to be shown, described coded message comprises Unicode coding;

Determination module, for determining described character to be shown whether in the coded message prestored according to described coded message;

Display module, for if so, then obtaining the profile information of described character to be shown the direct coded message from prestoring, drawing character graphics according to described profile information and showing described character to be shown.

7. device according to claim 6, is characterized in that, described determination module, comprising:

Determining unit, encodes for the Unicode according to described character to be shown, determines that the Unicode coding of described character to be shown is whether in the Unicode coding prestored, and whether the font size of described character to be shown is in the size range prestored.

8. device according to claim 6, is characterized in that, described display module, comprising:

Display unit, if for determining that the Unicode of described character to be shown is coded in the Unicode coding prestored, and the font size of described character to be shown is also in the size range prestored, then draw character graphics by GDI, and show described character to be shown.

9. the device according to claim 6 to 8 any one, is characterized in that, described device also comprises:

First memory module, for prestoring Unicode coding and the profile information of conventional characters of conventional characters.

10. the device according to claim 6 to 8 any one, is characterized in that, described method also comprises:

Second memory module, for prestoring the width information of character library.