CN102148021B - Display method and display device of vector font characters - Google Patents
Display method and display device of vector font characters Download PDFInfo
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Abstract
The invention discloses a display method of vector font characters, which comprises the steps of obtaining characters to be displayed and foreground color and background color of the characters to be displayed; calculating all display colors corresponding to the gray values in the gray level of a vector font engine according to the foreground color and background color of the characters to be displayed and saving the congruent relationship of the gray values and the calculated display colors; and obtaining a gray level bitmap of the characters to be displayed, obtaining and displaying the display colors corresponding to the saved gray values according to the gray value of each display point in the gray level bitmap. The embodiment of the invention also provides a display device of vector font characters. By adopting the method for calculating the display colors corresponding to the gray values in the gray level and saving the relationship of the gray values and the display colors in the technical scheme, the display speed of the vector font characters is increased.
Description
Technical field
The present invention relates to the character display technique field, be specifically related to a kind of display packing and display device of vector font library character.
Background technology
The character demonstration generally is divided into raster font and vector fonts; Each font is described through mathematic curve in the vector fonts; It has comprised the borderline key point of font; The derivative information of line etc., the render engine of font is played up through carrying out the certain mathematical computing through reading these mathematical vector then.The advantage of vector fonts is font physical size convergent-divergent and indeformable, variable color arbitrarily.Therefore, vector fonts has obtained very general application in present display device.
At present the display packing of vector font library character is, the vector font library engine calculates the gray scale dot matrix bitmap of character, and the bright of each display dot in the gray scale dot matrix bitmap secretly represent with gray scale, i.e. the gray-scale value of display dot.During the actual displayed character; Need be by foreground color and background color; Described foreground color is for wanting the characters displayed color; Described background color is the color that the backdrop display curtain of viewing area wanted in character, simultaneously according to the gray scale of display dot, the grey level of vector font library engine, confirms the Show Color of display dot.The different employed grey levels of vector font library engine are different, generally are 2 integral number powers, and as 16,64,128,256, the grey level of vector font library engine is a fixed value during operation in the compile time configuration usually.
For example application program need draw bold character " in ", the vector font library engine be responsible for from the black matrix character library, finding " in " the font description data, and calculate " in " gray scale dot matrix bitmap, with reference to figure 1, be under 16 grades of gray scales " in " gray scale dot matrix bitmap.Application program is drawn according to background color, foreground color after getting access to this dot matrix bitmap again.Suppose that current display dot gray-scale value is n, grey level is T, and foreground color is fg, and background color is bg.To each display dot, transparent fusion formula was calculated below the color of actual displayed was pressed: color=(n*fg+ (T-n) * bg)/T; Size like character is 24 pixels, and a character generally has 24*24=576 display dot, calculates by top formula; The procedure for displaying of each character has multiplication 2*24*24=1152 time; 1*24*24=576 division, the 1*24*24=576 sub-addition, visible calculated amount is big.The mistake intensive of vector font library engine has reduced the display speed of vector font library character.
Summary of the invention
The embodiment of the invention provides the display packing the present invention that can accelerate vector font library character display speed that the display device of vector font library character also is provided.
A kind of display packing of vector font library character comprises:
Obtain current characters displayed and current foreground color and the background color of wanting characters displayed wanted;
According to current foreground color and the background color of wanting characters displayed, all pairing Show Color of gray-scale value in the grey level of compute vectors character library engine, preserve gray-scale value and the Show Color that calculated between corresponding relation;
Obtain the current gray scale dot matrix bitmap of wanting characters displayed, obtain the Show Color of having preserved corresponding and show with this gray-scale value according to the gray-scale value of each display dot in the said gray scale dot matrix bitmap;
In the grey level of said compute vectors character library engine, also comprise after the step of all pairing Show Colors of gray-scale value:
Last employed background color of gray-scale value and the foreground color of calculating of record;
Said obtain the current step of wanting foreground color that characters displayed and current wants characters displayed and background color after, also comprise:
Judge that the current foreground color of characters displayed of wanting compares with background color with the foreground color that is write down with background color, whether have any one variation has taken place,
If; Then carry out said according to current foreground color and the background color of wanting characters displayed; All pairing Show Color of gray-scale value in the grey level of compute vectors character library engine, preserve gray-scale value and the Show Color that calculated between the step of corresponding relation;
If not, then carry out the said current gray scale dot matrix bitmap of wanting characters displayed that obtains, obtain Show Color of having preserved corresponding and the step that shows with this gray-scale value according to the gray-scale value of each display dot in the said gray scale dot matrix bitmap.
A kind of display device of vector font library character comprises:
Acquiring unit is used to obtain current characters displayed and current foreground color and the background color of wanting characters displayed wanted;
Calculating storaging unit is used for all pairing Show Colors of gray-scale value of grey level of compute vectors character library engine, preserve gray-scale value and the Show Color that calculated between corresponding relation;
Display unit is used for the gray scale dot matrix bitmap of wanting characters displayed according to current, obtains the Show Color of having preserved corresponding with this gray-scale value and shows according to the gray-scale value of each display dot in the said gray scale dot matrix bitmap;
Record cell is used for after all pairing Show Colors of gray-scale value of the grey level of said calculating storaging unit compute vectors character library engine, last employed background color of gray-scale value and the foreground color of calculating of record;
Judging unit; Be used for said acquiring unit obtain current want foreground color that characters displayed and current wants characters displayed and background color after; Judge that the current foreground color of characters displayed of wanting compares with background color with the foreground color that is write down with background color, whether have any one variation has taken place;
Said calculating storaging unit; Also being used for going out the current foreground color of characters displayed of wanting in said judgment unit judges compares with background color with the foreground color that is write down with background color; There is any one when variation has taken place; According to current foreground color and the background color of wanting characters displayed, all pairing Show Color of gray-scale value in the grey level of compute vectors character library engine, preserve gray-scale value and the Show Color that calculated between corresponding relation;
Said display unit; Also being used for going out the current foreground color of characters displayed of wanting in said judgment unit judges compares with background color with the foreground color that is write down with background color; There is not any one when variation has taken place; Obtain the current gray scale dot matrix bitmap of wanting characters displayed, obtain Show Color of having preserved corresponding and the step that shows with this gray-scale value according to the gray-scale value of each display dot in the said gray scale dot matrix bitmap.
The embodiment of the invention adopts obtains current characters displayed and current foreground color and the background color of wanting characters displayed wanted; According to current foreground color and the background color of wanting characters displayed, all pairing Show Color of gray-scale value in the grey level of compute vectors character library engine, preserve gray-scale value and the Show Color that calculated between corresponding relation; Obtain the current gray scale dot matrix bitmap of wanting characters displayed, obtain the Show Color of having preserved corresponding and the method that shows according to the gray-scale value of each display dot in the said gray scale dot matrix bitmap and carry out vector character and show with this gray-scale value.In technical scheme of the present invention and the prior art during character display each display dot all carry out a color calculation respectively and compare, reduced the calculated amount of vector font library engine, accelerated the display speed of vector font library character.
Description of drawings
Fig. 1 is under 16 grades of gray scales, " in " the gray scale dot matrix bitmap of word;
Fig. 2 is the embodiment synoptic diagram of the display packing in the embodiment of the invention;
Fig. 3 is a synoptic diagram of choosing background color in the embodiment of the invention;
Fig. 4 is the embodiment synoptic diagram of the display device in the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of display packing of vector font library character, is used to improve the display speed of vector font library character.The embodiment of the invention also provides the display device of corresponding vector font library character.Below be elaborated respectively.
Embodiment one,
See also Fig. 2, the embodiment of display packing comprises in the embodiment of the invention
101, obtain current characters displayed and current foreground color and the background color of wanting characters displayed wanted;
In showing the vector character process, the vector font library engine gets access to current characters displayed and the current color of wanting characters displayed wanted that application program is sent, and this is current, and to want the color of characters displayed be foreground color.Simultaneously, the vector font library engine color color as a setting that gets access to the current regional center point of wanting the target location that character display will show.
Consult Fig. 3, with " in " word is example, the target location that shows according to character, the size of character gray scale dot matrix bitmap, the color of choosing character viewing area central point 3 on the background is color as a setting.
Usually; The viewing area of single character is very little; Even background color that should each point of zone is incomplete same, also can be more similar, the character Show Color that the color of getting central point is calculated as unified background color with by actual color in the background; Each point is carried out independently transparent fusion calculate final display effect sensuously, differentiate to come out at naked eyes.Therefore, this mode of choosing is rational.
102, according to current foreground color and the background color of wanting characters displayed, all pairing Show Color of gray-scale value in the grey level of compute vectors character library engine, preserve gray-scale value and the Show Color that calculated between corresponding relation;
The current foreground color of characters displayed of wanting is made as fg; The current background color of characters displayed of wanting is made as bg; The grey level of vector font library engine is a fixed value, and establishing this fixed value is T, and gray-scale values all in the grey level under the vector font library engine are made as i; I is more than or equal to 0 integer less than T, and the expression formula of all pairing Show Colors of gray-scale value is in the vector font library engine grey level:
text_colors[i]=(i*fg+(T–i)*bg)/T;
Show Color all gray-scale values in the vector font library engine grey level are corresponding through this expression formula all calculates, and preserves the corresponding relation of all gray-scale values and the Show Color that is calculated.
103, last employed background color of gray-scale value and the foreground color of calculating of record;
Last calculating employed background color of gray-scale value and foreground color in 102 steps are noted.
Whether 104, the current foreground color of characters displayed of wanting of judgement is compared with background color with the foreground color that is write down with background color, have any one variation has taken place,
The employed background color of last calculating gray-scale value that writes down in the current foreground color of wanting characters displayed that gets access in 101 steps and background color and 103 steps is compared with foreground color, judged whether that any one variation has taken place.
105, obtain the current gray scale dot matrix bitmap of wanting characters displayed, obtain the Show Color of having preserved corresponding and show with this gray-scale value according to the gray-scale value of each display dot in the said gray scale dot matrix bitmap.
The concrete workflow of present embodiment can be, and is current when wanting characters displayed to be first character, carries out in the above-mentioned steps in order: 101,102,103 and 105,
101, obtaining first wants characters displayed and first to want the foreground color and the background color of characters displayed;
102, want the foreground color and the background color of characters displayed according to first, all pairing Show Color of gray-scale value in the grey level of compute vectors character library engine, preserve gray-scale value and the Show Color that calculated between corresponding relation;
103, last employed background color of gray-scale value and the foreground color of calculating of record;
105, obtain the gray scale dot matrix bitmap that first wants characters displayed, obtain the Show Color of having preserved corresponding and show with this gray-scale value according to the gray-scale value of each display dot in the said gray scale dot matrix bitmap.
If no longer show also execution in step 103 not of other characters after above-mentioned procedure for displaying finishes.
The concrete workflow of present embodiment does, current when wanting non-first character of characters displayed, execution in step has two kinds of situation: first kind of situation for carry out in order 101,104 and 105, the second kind of situation for carrying out 101,104,102,103 and 105 in order;
The specific descriptions of first kind of situation are:
101, obtain current characters displayed and current foreground color and the background color of wanting characters displayed wanted;
Whether 104, the current foreground color of characters displayed of wanting of judgement is compared with background color with the foreground color that is write down with background color, have any one variation has taken place,
Have no one to change if the current foreground color of wanting characters displayed is compared with background color with the foreground color that is write down with background color, then execution in step 105,
105, obtain the current gray scale dot matrix bitmap of wanting characters displayed, obtain the Show Color of having preserved corresponding and show with this gray-scale value according to the gray-scale value of each display dot in the said gray scale dot matrix bitmap.
The specific descriptions of second kind of situation are:
101, obtain current characters displayed and current foreground color and the background color of wanting characters displayed wanted;
Whether 104, the current foreground color of characters displayed of wanting of judgement is compared with background color with the foreground color that is write down with background color, have any one variation has taken place,
Wherein variation has taken place in any one if the current foreground color of wanting characters displayed has been compared with background color with background color and the foreground color that is write down, and then execution in step 102, then execution in step 103 and 105;
102, according to current foreground color and the background color of wanting characters displayed, all pairing Show Color of gray-scale value in the grey level of compute vectors character library engine, preserve gray-scale value and the Show Color that calculated between corresponding relation;
103, last employed background color of gray-scale value and the foreground color of calculating of record;
105, obtain the current gray scale dot matrix bitmap of wanting characters displayed, obtain the Show Color of having preserved corresponding and show with this gray-scale value according to the gray-scale value of each display dot in the said gray scale dot matrix bitmap.
If no longer show also execution in step 103 not of other characters after above-mentioned procedure for displaying finishes.
For ease of understanding, with a concrete application scenarios vector character character library display packing of describing in the foregoing description is described in detail below, concrete:
If the grey level T of character library character engine is 16, background color and foreground color are constant, are respectively bg and fg, and the calculating of the Show Color that then all gray-scale values in the vector font library engine grey level are corresponding can be represented in order to minor function:
Text_colors wherein [T] has comprised the pairing Show Color of all gray-scale values; From functional expression, can read; When grey level T is 16; The current procedure for displaying of characters displayed of wanting only needs the vector font library engine to carry out 2*16=32 multiplying; 1*16=16 division arithmetic and the computing of 1*16=16 sub-addition are at last according to the corresponding relation of gray-scale value and Show Color, according to the direct Show Color that just can obtain correspondence of gray-scale value of display dot in the current gray scale dot matrix bitmap of wanting character display.If but by wanting display packing of the prior art, to each display dot, transparent fusion formula was calculated below the color of actual displayed was pressed:
Color=(n*fg+ (T-n) * bg)/T; Size like word is 24 pixels, and a character generally has 24*24=576 display dot, calculates by top formula, and each character has multiplication 2*24*24=1152 time, 1*24*24=576 division, 1*24*24=576 sub-addition.It is thus clear that the display packing of the vector font library character that the embodiment of the invention provides has been accelerated the display speed of character greatly, has shortened the stand-by period.Especially used background color and the foreground color of the last calculating of record avoided wanting recomputating of character display at the back, further reduced operand.Particularly application program generally can only not show a character, and general scene then is to use identical foreground color to show a character string.In this case; Foreground color is constant; If background color also is identical in the character string display zone, then to whole character string, only with calculating once; The Show Color that only need from the corresponding relation of the gray-scale value preserved and Show Color, obtain display dot during each the demonstration gets final product, and has improved the display speed of character more.
Introduce the embodiment of display device among the present invention below, see also Fig. 4, the display device in the embodiment of the invention comprises:
Acquiring unit 201 is used to obtain current characters displayed and current foreground color and the background color of wanting characters displayed wanted;
Calculating storaging unit 202 is used for all pairing Show Colors of gray-scale value of grey level of compute vectors character library engine, preserve gray-scale value and the Show Color that calculated between corresponding relation;
The display device of the embodiment of the invention also comprises:
Whether judging unit 204 is used to judge that the current foreground color of characters displayed of wanting compares with background color with the foreground color that is write down with background color, have any one variation has taken place.
The course of work of the display device that the embodiment of the invention provides has three kinds of situations, is respectively:
First kind of situation is:
Acquiring unit 201 gets access to current characters displayed and current foreground color and the background color of wanting characters displayed wanted;
All pairing Show Color of gray-scale value in the grey level of calculating storaging unit 202 compute vectors character library engines, and preserve gray-scale value and the Show Color that calculated between corresponding relation;
Last employed background color of gray-scale value and the foreground color of calculating of record cell 203 records;
If first shows that no longer other characters also can not start record cell 203 after wanting the characters displayed procedure for displaying to finish.
Second kind of situation is:
Acquiring unit 201 obtains current characters displayed and current foreground color and the background color of wanting characters displayed wanted;
Whether judging unit 204, the current foreground color of characters displayed of wanting of judgement are compared with background color with the foreground color that is write down with background color, have any one variation has taken place,
Have no one to change if the current foreground color of wanting characters displayed is compared with background color with the foreground color that is write down with background color, then start display unit 205,
The third situation is:
Acquiring unit 201, obtain current characters displayed and current foreground color and the background color of wanting characters displayed wanted;
Whether judging unit 204, the current foreground color of characters displayed of wanting of judgement are compared with background color with the foreground color that is write down with background color, have any one variation has taken place,
Wherein variation has taken place in any one if the current foreground color of wanting characters displayed has been compared with background color with background color and the foreground color that is write down, and then starts calculating storaging unit 202, starts record cell 203 and display unit 205 then;
Calculating storaging unit 202, according to current foreground color and the background color of wanting characters displayed; All pairing Show Color of gray-scale value in the grey level of compute vectors character library engine, preserve gray-scale value and the Show Color that calculated between corresponding relation;
If above-mentioned procedure for displaying shows that no longer other characters also can not start record cell 203 after finishing.
One of ordinary skill in the art will appreciate that all or part of step in the whole bag of tricks of the foregoing description is to instruct relevant hardware to accomplish through program; This program can be stored in the computer-readable recording medium, and storage medium can comprise: ROM, RAM, disk or CD etc.
More than the display packing of the vector font library character that the embodiment of the invention provided and the display device of vector font library character have been carried out detailed introduction; Used concrete example among this paper principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (3)
1. the display packing of a vector font library character is characterized in that, comprising:
Obtain current characters displayed and current foreground color and the background color of wanting characters displayed wanted;
According to current foreground color and the background color of wanting characters displayed, all pairing Show Color of gray-scale value in the grey level of compute vectors character library engine, preserve gray-scale value and the Show Color that calculated between corresponding relation;
Obtain the current gray scale dot matrix bitmap of wanting characters displayed, obtain the Show Color of having preserved corresponding and show with this gray-scale value according to the gray-scale value of each display dot in the said gray scale dot matrix bitmap;
In the grey level of said compute vectors character library engine, also comprise after the step of all pairing Show Colors of gray-scale value:
Last employed background color of gray-scale value and the foreground color of calculating of record;
Said obtain the current step of wanting foreground color that characters displayed and current wants characters displayed and background color after, also comprise:
Judge that the current foreground color of characters displayed of wanting compares with background color with the foreground color that is write down with background color, whether have any one variation has taken place,
If; Then carry out said according to current foreground color and the background color of wanting characters displayed; All pairing Show Color of gray-scale value in the grey level of compute vectors character library engine, preserve gray-scale value and the Show Color that calculated between the step of corresponding relation;
If not, then carry out the said current gray scale dot matrix bitmap of wanting characters displayed that obtains, obtain Show Color of having preserved corresponding and the step that shows with this gray-scale value according to the gray-scale value of each display dot in the said gray scale dot matrix bitmap.
2. the display packing of vector font library character according to claim 1 is characterized in that, the step of the pairing Show Color of any gray-scale value in the grey level of said compute vectors character library engine in all gray-scale values is specially:
text_colors[i]=(i*fg+(T-i)*bg)/T;
Wherein i is more than or equal to 0 integer less than T; Expression each gray-scale value in the grey level, text_colors [i] are the Show Color of gray-scale value when being i, and bg is the current background color of wanting characters displayed; Fg is the current foreground color of wanting characters displayed, and T is a grey level.
3. the display device of a vector font library character is characterized in that, comprising:
Acquiring unit is used to obtain current characters displayed and current foreground color and the background color of wanting characters displayed wanted;
Calculating storaging unit is used for all pairing Show Colors of gray-scale value of grey level of compute vectors character library engine, preserve gray-scale value and the Show Color that calculated between corresponding relation;
Display unit is used for the gray scale dot matrix bitmap of wanting characters displayed according to current, obtains the Show Color of having preserved corresponding with this gray-scale value and shows according to the gray-scale value of each display dot in the said gray scale dot matrix bitmap;
Record cell is used for after all pairing Show Colors of gray-scale value of the grey level of said calculating storaging unit compute vectors character library engine, last employed background color of gray-scale value and the foreground color of calculating of record;
Judging unit; Be used for said acquiring unit obtain current want foreground color that characters displayed and current wants characters displayed and background color after; Judge that the current foreground color of characters displayed of wanting compares with background color with the foreground color that is write down with background color, whether have any one variation has taken place;
Said calculating storaging unit; Also being used for going out the current foreground color of characters displayed of wanting in said judgment unit judges compares with background color with the foreground color that is write down with background color; There is any one when variation has taken place; According to current foreground color and the background color of wanting characters displayed, all pairing Show Color of gray-scale value in the grey level of compute vectors character library engine, preserve gray-scale value and the Show Color that calculated between corresponding relation;
Said display unit; Also being used for going out the current foreground color of characters displayed of wanting in said judgment unit judges compares with background color with the foreground color that is write down with background color; There is not any one when variation has taken place; Obtain the current gray scale dot matrix bitmap of wanting characters displayed, obtain Show Color of having preserved corresponding and the step that shows with this gray-scale value according to the gray-scale value of each display dot in the said gray scale dot matrix bitmap.
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| CN201110069021A CN102148021B (en) | 2011-03-22 | 2011-03-22 | Display method and display device of vector font characters |
| HK12100078.1A HK1159837A1 (en) | 2011-03-22 | 2012-01-05 | A display method and display device for vector font library character |
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| CN101562005A (en) * | 2008-04-15 | 2009-10-21 | 三菱电机株式会社 | Character display apparatus |
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| CN101908216A (en) * | 2010-07-20 | 2010-12-08 | 中兴通讯股份有限公司 | Method and device for realizing vector fonts |
| CN101930725A (en) * | 2009-12-09 | 2010-12-29 | 杭州华三通信技术有限公司 | Method and device for displaying character |
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| JP2006163651A (en) * | 2004-12-03 | 2006-06-22 | Sony Computer Entertainment Inc | Display device, control method of display device, program and font data |
| JP2010175638A (en) * | 2009-01-27 | 2010-08-12 | Mitsubishi Electric Corp | Display device and method for display in display device |
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| CN101904169A (en) * | 2008-02-14 | 2010-12-01 | 松下电器产业株式会社 | Reproduction device, integrated circuit, reproduction method, program, and computer-readable recording medium |
| CN101562005A (en) * | 2008-04-15 | 2009-10-21 | 三菱电机株式会社 | Character display apparatus |
| CN101635004A (en) * | 2009-08-18 | 2010-01-27 | 中兴通讯股份有限公司 | Color matching method and color matching device based on terminal |
| CN101930725A (en) * | 2009-12-09 | 2010-12-29 | 杭州华三通信技术有限公司 | Method and device for displaying character |
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| CN102148021A (en) | 2011-08-10 |
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