CN107479897B - A kind of vector graphics interface Zoom method used on video monitoring equipment - Google Patents
A kind of vector graphics interface Zoom method used on video monitoring equipment Download PDFInfo
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- CN107479897B CN107479897B CN201710730718.XA CN201710730718A CN107479897B CN 107479897 B CN107479897 B CN 107479897B CN 201710730718 A CN201710730718 A CN 201710730718A CN 107479897 B CN107479897 B CN 107479897B
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
- G06F9/451—Execution arrangements for user interfaces
Abstract
The invention provides a kind of vector graphics interface Zoom method used on video monitoring equipment, including the step such as FrameBuffer dynamic initializations, the message informing of dynamic adjustment and response, the dynamic adjustment of word size.The vector graphics interface drawn by this method can carry out stepless zooming by adjusting parameter to the interface size of output, so as to accomplish display effect of the graphical interfaces without deformation indifference under low resolution and high-resolution, whole figure interface can keep indeformable after it have switched resolution ratio, the effect of vector scaling is reached, and can be good at solving the problems, such as the problem of size customizes difficult and resolution ratio compatibility in UI designs.
Description
Technical field
The present invention relates to embedded video monitoring system technical field, and in particular to a kind of arrow used on video monitoring equipment
Measure graphical interfaces Zoom method.
Background technology
Nowadays, the technology of field of video monitoring has just been brought up to now by 960P in fast development, the definition of camera
More than 10,000,000, the performance of equipment master chip there has also been qualitative leap, but the graphical interfaces of embedded monitoring equipment is always
All without great change, user wishes can there is more preferable usage experience on the premise of the main functionality of video monitoring is ensured,
More attractive operation interface more directly perceived is wished to, embedded video monitoring system equipment typically has to the efficiency of memory space and program
Compare harsh requirement, graphical interfaces application program should not take excessive Flash spaces, should not also take during operation
More CPU and internal memory.
For the consideration to cost and equipment performance, what present most video monitoring equipment developers used is all fixed
The graphical interfaces of pixel, i.e., fixed in the pixel value of different resolution interface menu, or limited contracting is carried out to window
Put, main cause is that dot matrix character has been used in terms of the display of word, and dot matrix character has the advantages of display efficiency is high, but its picture
Plain value is fixed, because word font size can not adjust, menu of being lived to window can cause to show after scaling it is uncoordinated, therefore in height
Output resolution ratio under interface menu can seem very small, and menu seems excessive under low resolution, very unsightly, operates
It is also inconvenient to come.
Publication No. CN102298500A Chinese patent application discloses " a kind of adaptive screen zooming adjusting method ",
This method is by calling the api function of current operation system, to increase operating system PPI numbers (PixelsPerInch) to reduce
The Pixel Dimensions of graphic user interface content element, and by calling the graphic plotting function of current operation system, screen is shown
Show region sectional drawing and reduce display size.This method can be according to the physical size of screen, resolution ratio, paropion spacing, and people
Self-demand is adaptively adjusted, and to meet ergonomics demand, improves man-machine interaction efficiency.But this method is general
Mobile phone is only applicable to, the graphical interfaces for fixation element in video monitoring equipment is unconformable.
Publication No. CN102662616A Chinese patent application disclose " a kind of screen graph for mobile terminal from
Adaptive method and system ", the information parameter that this method is applied by obtaining facility information parameter and Widget, and by figure from
Adaptive algorithm mechanism changes the graphical display parameter of former Widget applications, has reached the adaptive purpose of figure, so that should
More flexible in the terminal of different resolution and different operating system it can be used with program.But this method still can not
Solve, in the case where pixel value is fixed, word font size can not adjust, window live can cause to show after menu scaling it is uncoordinated,
Interface menu can seem small under height output resolution ratio, and menu seems the defects of excessive under low resolution.
The content of the invention
In view of the shortcomings of the prior art, the invention provides a kind of vector that can be freely scaled on video monitoring equipment
The Zoom method of graphical interfaces, stepless zooming can be carried out to the interface size of output, so as to accomplish in low resolution and high score
Display effect of the graphical interfaces without deformation indifference under resolution.
To realize above-mentioned technical proposal, the invention provides a kind of vector graphics interface used on video monitoring equipment
Zoom method, specifically comprise the following steps：
Step 1, FrameBuffer dynamic initializations：
Step 11, GUI outputs are closed, disable plotting equipment, solution removes the FrameBuffer virtual memorys mapped, closes
The filec descriptor accessed FrameBuffer is closed, discharges the backup buffer of drawing；
Step 12, the parameter by ioctl () system call interfaces modification FrameBuffer；
Step 13, GUI output modules are reinitialized, reopen FrameBuffer, called by ioctl () system
FrameBuffer hardware parameter is obtained, FrameBuffer is mapped to virtual address space and basis again
Resolution ratio new FrameBuffer creates drawing backup buffer again；
Step 14, GUI outputs are opened, redraw whole FrameBuffer, restore original image；
Step 2, the message informing of dynamic adjustment and response：
Step 21, adjustment message informing；Pass through graphical interface system immediately after the completion of FrameBuffer dynamic initializations
In all windows and control of the message transmission interface into graphical interfaces send the message of a resolution sizes change；
Step 22, the response to message informing；After each object receives message, according to the characteristic of itself come adjust automatically from
Body interface size, wherein, if GUI top level management object UiManager, then it receives message at first, and UiManager can be right
The related factor of vector scaling is recalculated, and the size at the direct adjustment member window of meeting and interface, other objects
The zoom factor newly calculated with reference to UiManager adjusts itself interface size；
Step 3, the adjustment of the dynamic of word size：
The generation of step 31, type matrix；Using FreeType analytics engines, according to given unicode, font size, font category
Property automatically generates the type matrix of needs；
The caching of step 32, type matrix；Using L2 cache and Hash table is used in combination, is realized pair by using Read-Write Locks
Multithreading efficiently concurrently accesses, and first order caching caching is specific type matrix address, is realized using Hash table, Hash table
Key values generate as follows：
UINT32 Key=FontAttr<<24|FontSize<<16|Unicode
Wherein, whether FontAttr is font attribute, include whether as italic, be runic, FontAttr=IsBold |
(IsItalic<<1)；IsBold and IsItalic fields are bool types, and FontSize is font size size, span for [1,
255], Unicode is that the Unicode of corresponding word is encoded；
Show that the type matrix is not parsed when the Key for finding to access is not present in Hash table, call immediately
The type matrix parsing generation type matrix of FreeType engines, and apply for necessary internal memory to store type matrix, then using the Key of access as Kazakhstan
The Key of uncommon table, with apllied internal memory it is first be that value is inserted into Hash table, each type matrix uses independent reference count,
For identifying the number that the type matrix is currently being used this moment, and the capacity of largest buffered is set in type matrix caching, works as caching
Capacity be more than limit capacity after, type matrix cache module can discharge currently without the type matrix used automatically, and by its
Buffer address removes from Hash table；
Step 33, the adjustment of word size；Generate type matrix caching after, graphical interfaces when adjusting itself size according to
The word zoom factor that UiManager is provided adjusts the size of word.
Preferably, in the step 22, after each object receives message, according to the characteristic of itself come adjust automatically itself boundary
The method of face size is as follows：The type of message that resolution sizes change is specially RSEvent::DesktopSizeChanged, should
Message is distributed by event distribution system, and when the event is delivered to specific object, the desktopEvent () of the object is empty
Interface can be triggered, if the Properties of Objects is desirable to adapt to the resolution ratio of screen automatically when resolution ratio changes,
It can be by realizing interrelated logic in desktopEvent () virtual interface, such as calls the resize () interface of itself to change
Size, if the effect of certain object and characteristic determine that the change of it and resolution ratio is not related, it does not have to appoint the event
Where reason is without realizing the virtual interface.
Preferably, in the step 22, the computational methods of zoom factor are as follows：When UiManager objects
DesktopEvent () interface receives RSEvent at it::It is triggered during DesktopSizeChanged events, then calls
InitSysMetrics () interface, the interface is used for recalculating zoom factor, and reconfigures virtual-screen region, the overall situation
Viewing area, global style, all correlation module desktop resolution ratios are finally notified to change in a manner of asynchronous multicast, and
The current resolution ratio of screen is obtained by desktopSize () interface.
Preferably, in the step 21, by indirectly calling desktopEvent () virtual interface of each object to realize
All windows and control into graphical interfaces send the message of a resolution sizes change.
Preferably, in step 12, FrameBuffer parameter is changed by ioctl () system call interfaces includes modification
The width of new resolution ratio, height and color format afterwards.
A kind of vector graphics interface Zoom method beneficial effect used on video monitoring equipment provided by the invention exists
In：This method changes FrameBuffer parameter by ioctl () system call interfaces, and can be to arrow by UiManager
The related factor of amount scaling is recalculated, and then calls FreeType engines parsing generation type matrix, and graphical interfaces is adjusting
It is big that the word that pixel value is fixed during itself size also can voluntarily adapt to adjustment according to the word zoom factor that UiManager is provided
It is small, the stepless zooming of interface size is realized, ensures that graphical interfaces is without deformation indifference under low resolution and high-resolution
Display effect, whole figure interface can keep indeformable after it have switched resolution ratio, reach the effect of vector scaling.
Brief description of the drawings
Fig. 1 is the flow chart of the present invention；
Fig. 2 is the code block in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Whole description, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Ability
All other embodiment that domain ordinary person is obtained under the premise of creative work is not made, belong to the protection of the present invention
Scope.
Embodiment：A kind of vector graphics interface Zoom method used on video monitoring equipment.
Shown in reference picture 1, a kind of vector graphics interface Zoom method used on video monitoring equipment, specifically include as
Lower step：
Step 1, FrameBuffer dynamic initializations：
FrameBuffer is the figure shows frame buffer of built-in Linux video monitoring equipment, and FrameBuffer's divides
Resolution directly determines GUI output resolution ratio, and equipment can be switched to another kind by user by a kind of resolution ratio in practical application,
GUI is required to adapt to new resolution ratio automatically during this, reaches this function as follows in the present embodiment：
Step 11, GUI outputs are closed, disable plotting equipment, solution removes the FrameBuffer virtual memorys mapped, closes
The filec descriptor accessed FrameBuffer is closed, discharges the backup buffer of drawing；
Step 12, the parameter by ioctl () system call interfaces modification FrameBuffer, pass through ioctl () system
Calling interface modification FrameBuffer parameter specifically includes width, height and color format of new resolution ratio etc. after modification；
Step 13, GUI output modules are reinitialized, reopen FrameBuffer, called by ioctl () system
FrameBuffer hardware parameter (resolution ratio for wherein including FrameBuffer) is obtained, again reflects FrameBuffer
It is mapped to virtual address space and drawing backup buffer is created according to resolution ratio new FrameBuffer again；
Step 14, GUI outputs are opened, redraw whole FrameBuffer, restore original image；
This is arrived, FrameBuffer dynamic initializations are completed, and graphic interface completes pair in the case where process is not restarted
The adaptation of resolution adjustment；
Step 2, the message informing of dynamic adjustment and response：
After the adjustment of step 1, graphical interfaces has been operated under new resolution ratio, but every in graphical interfaces
Individual window, control are all also in original pixels size, in order to reach the effect of vector scaling, each element in graphical interfaces
Need to carry out size adjustment, realized in the present embodiment using following scheme：
Step 21, adjustment message informing, can pass through graphical interfaces system immediately after the completion of FrameBuffer dynamic initializations
All windows and control in message transmission interface graphical interfaces in system send the message of a resolution sizes change, specifically
It is by indirectly calling desktopEvent () virtual interface of each object to realize all windows and control into graphical interfaces
Part sends the message of a resolution sizes change；
Step 22, the response to message informing；, can root after each object receives message (desktopEvent () is called)
The size of itself interface or some other relevant issues are adjusted according to the characteristic of itself, and its detailed process is as follows：Differentiate
The type of message that rate size changes is specially RSEvent::DesktopSizeChanged, the message are entered by event distribution system
Row distribution, when the event is delivered to specific object, desktopEvent () virtual interface of the object can be triggered, if should
Properties of Objects is desirable to adapt to the resolution ratio of screen automatically when resolution ratio changes, then it can pass through desktopEvent
Interrelated logic is realized in () virtual interface, such as calls the resize () interface of itself to change size, if the effect of certain object
Determine that the change of it and resolution ratio is not related with characteristic, then it does not have to make the event any processing without realizing the virtual connection
Mouthful；
Wherein, if GUI top level management object UiManager, then it receives message at first, and UiManager can be to arrow
The related factor of amount scaling is recalculated, and the size at the direct adjustment member window of meeting and interface, other objects ginsengs
Examine the zoom factor that UiManager is newly calculated and adjust itself interface size；The computational methods of zoom factor are as follows：
Shown in code block in reference picture 2, desktopEvent () interface of UiManager objects receives at it
RSEvent::It is triggered during DesktopSizeChanged events, then calls initSysMetrics () interface, the interface
For recalculating zoom factor, (wherein mXRatio, mYRatio, mFontPixRatio are respectively horizontal direction, Vertical Square
To, text pixel value zoom factor), and virtual-screen region, global viewing area, global style are reconfigured, finally with different
The mode of step multicast notifies all correlation module desktop resolution ratios to change；RsApp is GUI system sentence in Fig. 2 code blocks
Handle, the current resolution ratio of screen (above resolution ratio has switched completion) can be obtained by its desktopSize () interface,
MHdmiScale, mHdmiXOffset, mHdmiYOffset are that user can be joined by the scaling of graphic interface dynamic configuration
Consider, its span is [0,1000], and when mHdmiScale values are 1000, interface is paved with whole screen, and interface is big when being 0
Small is 0；
Step 3, the adjustment of the dynamic of word size：
After step 2, graphical interfaces has just reached the effect of vector scaling on the whole, but the size of word is also
Shown by original pixel, this can cause interface text importing very uncoordinated, therefore word is also required to energy vector scaling, word
Vector scaling be difficult point in this several technical schemes, display word is an operation for consuming very much performance, is usually embedded
What formula equipment used is all dot matrix word library, and the type matrix of dot matrix word library previously generates, and need not parse during use can be straight
Connect for rendering text, substantial amounts of CPU can be saved, but this also determines the problem of dot-matrix font scales without law vector, even if can
To amplify type matrix as display effect is bad is abandoned by operations such as interpolation, type matrix interpolation amplification is also required in addition
Substantial amounts of CPU is consumed, it is inadvisable, found by numerous studies, graphical interfaces has used most embedded monitoring products all
The vector font library not used, there is no ready-made type matrix, it is necessary to can just obtain type matrix after parsing in vector font library, parsing arrow
Amount type matrix can use substantial amounts of floating-point operation, and the consumption to CPU is far longer than dot matrix word library, therefore word is introduced in the present embodiment
Mould caching management module, concrete technical scheme are described as follows：
The generation of step 31, type matrix, the generation of type matrix by means of present wide variety of FreeType analytics engines, its energy
According to the type matrix of given unicode, font size, font attribute come required for；
The caching of step 32, type matrix, this design are the keys of Properties Control, due to vector type matrix parsing very
CPU is consumed, reduces the analytic frequency of type matrix with regard to the consumption to CPU can be reduced, a word need to only solve when using first in principle
Analysis, is just buffered, L2 cache is employed in the present embodiment and Hash table has been used in combination before performance is ensured immediately
Put to save the consumption to internal memory on the whole, then multithreading is efficiently concurrently visited to realize by using Read-Write Locks
Ask, wherein first order caching caching is specific type matrix address, is realized using Hash table, Hash table Key values are as follows
Generation：
UINT32Key=FontAttr<<24|FontSize<<16|Unicode
Wherein, whether FontAttr is font attribute, include whether as italic, be runic, FontAttr=IsBold |
(IsItalic<<1)；IsBold and IsItalic fields are bool types, and FontSize is font size size, span for [1,
255], Unicode is that the Unicode of corresponding word is encoded；
Type matrix caching provides unique interface for obtaining type matrix, the i.e. table when the Key for finding to access is not present in Hash table
The bright type matrix is not parsed, calls the type matrix parsing generation type matrix of FreeType engines immediately, and applies for that necessary internal memory comes
Type matrix is stored, then the Key using the Key of access as Hash table, such as first Chinese character " one " in Unicode codings, its
Unicode is encoded to 0x4E00, it is assumed that we think the type matrix of No. 18 bold Italics of acquisition, then FontSize=18, FontAttr=1
|(1<<1), i.e. FontAttr=3, therefore the Hash table Key values of bold Italic " one " word ultimately produced are：
Key=(0x3<<24)|(18<<16)|0x4E00；(Key=0x03124e00) just can be by this behind,
Key values (0x3124e00) get the type matrix；Apllied internal memory is inserted into Hash table for value firstly, each type matrix
There is independent reference count, for identifying the number that the type matrix is currently being used this moment, type matrix caching can set largest buffered
Capacity, after the capacity of caching has been more than the capacity limited, type matrix cache module can discharge currently without being used automatically
Type matrix, and its buffer address is removed from Hash table；
Step 33, there is type matrix caching, graphical interfaces can also provide when adjusting itself size into according to UiManager
Word zoom factor adjust the size of word, to this whole figure interface can keep indeformable after it have switched resolution ratio,
The effect of vector scaling is reached.
Described above is presently preferred embodiments of the present invention, but the present invention should not be limited to the embodiment and accompanying drawing institute is public
The content opened, so every do not depart from the lower equivalent or modification completed of spirit disclosed in this invention, both fall within protection of the present invention
Scope.
Claims (5)
1. a kind of vector graphics interface Zoom method used on video monitoring equipment, it is characterised in that specifically include following
Step：
Step 1, FrameBuffer dynamic initializations：
Step 11, GUI outputs are closed, disable plotting equipment, solution removes the FrameBuffer virtual memorys mapped, closing pair
The filec descriptor that FrameBuffer is accessed, discharge the backup buffer of drawing；
Step 12, the parameter by ioctl () system call interfaces modification FrameBuffer；
Step 13, GUI output modules are reinitialized, reopen FrameBuffer, called and obtained by ioctl () system
FrameBuffer hardware parameter, FrameBuffer is mapped to virtual address space and new according to FrameBuffer again
Resolution ratio create drawing backup buffer again；
Step 14, GUI outputs are opened, redraw whole FrameBuffer, restore original image；
Step 2, the message informing of dynamic adjustment and response：
Step 21, adjustment message informing；Immediately by graphical interface system after the completion of FrameBuffer dynamic initializations
All windows and control of the message transmission interface into graphical interfaces send the message of a resolution sizes change；
Step 22, the response to message informing；After each object receives message, according to the characteristic of itself come adjust automatically itself boundary
Face size, wherein, if GUI top level management object UiManager, then it receives message at first, and UiManager can be to vector
The related factor of scaling is recalculated, and the size at the direct adjustment member window of meeting and interface, other objects references
The zoom factor that UiManager is newly calculated adjusts itself interface size；
Step 3, the adjustment of the dynamic of word size：
The generation of step 31, type matrix；Using FreeType analytics engines, according to given unicode, font size, font attribute from
The type matrix that dynamic generation needs；
The caching of step 32, type matrix；Using L2 cache and Hash table is used in combination, is realized by using Read-Write Locks to multi-thread
Journey efficiently concurrently accesses, and first order caching caching is specific type matrix address, is realized using Hash table, Hash table Key values
Generate as follows：
UINT32 Key=FontAttr<<24|FontSize<<16|Unicode
Wherein, whether FontAttr is font attribute, include whether as italic, be runic, FontAttr=IsBold |
(IsItalic<<1)；IsBold and IsItalic fields are bool types, and FontSize is font size size, span for [1,
255], Unicode is that the Unicode of corresponding word is encoded；
Show that the type matrix is not parsed when the Key for finding to access is not present in Hash table, call FreeType immediately
The type matrix parsing generation type matrix of engine, and apply for necessary internal memory to store type matrix, then using the Key of access as Hash table
Key, with apllied internal memory it is first be inserted into Hash table for value, each type matrix uses independent reference count, for marking
Know the number that the type matrix is currently being used this moment, and the capacity of largest buffered is set in type matrix caching, when the capacity of caching
After being more than the capacity limited, type matrix cache module can discharge currently without the type matrix used automatically, and be cached ground
Location removes from Hash table；
Step 33, the adjustment of word size；After generating type matrix caching, graphical interfaces is when adjusting itself size according to UiManager
The word zoom factor of offer adjusts the size of word.
2. the vector graphics interface Zoom method according to claim 1 used on video monitoring equipment, its feature exist
In in the step 22, after each object receives message, according to the characteristic of itself come the method for adjust automatically itself interface size
It is as follows：The type of message that resolution sizes change is specially RSEvent::DesktopSizeChanged, the message is by event point
Hair system is distributed, and when the event is delivered to specific object, desktopEvent () virtual interface of the object can be touched
Hair, if the Properties of Objects is desirable to adapt to the resolution ratio of screen automatically when resolution ratio changes, it can pass through
Interrelated logic is realized in desktopEvent () virtual interface, calls the resize () interface of itself to change size, if certain is right
The effect of elephant and characteristic determine that the change of it and resolution ratio is not related, then it does not have to make the event any processing without reality
The now virtual interface.
3. the vector graphics interface Zoom method according to claim 1 or 2 used on video monitoring equipment, its feature
It is, in the step 22, the computational methods of zoom factor are as follows：
When desktopEvent () interface of UiManager objects receives RSEvent at it::DesktopSizeChanged things
It is triggered during part, then calls initSysMetrics () interface, the interface is used for recalculating zoom factor, and matches somebody with somebody again
Virtual-screen region, global viewing area, global style are put, all correlation module desktops are finally notified in a manner of asynchronous multicast
Resolution ratio has changed, and obtains the current resolution ratio of screen by desktopSize () interface.
4. the vector graphics interface Zoom method according to claim 3 used on video monitoring equipment, its feature exist
In：In the step 21, by indirectly calling desktopEvent () virtual interface of each object to realize into graphical interfaces
All windows and control send the message of resolution sizes change.
5. the vector graphics interface Zoom method according to claim 1 used on video monitoring equipment, its feature exist
In：In step 12, FrameBuffer parameter is changed by ioctl () system call interfaces includes new resolution ratio after changing
Wide, high and color format.
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| CN109857357B (en) * | 2019-02-27 | 2022-02-01 | 乐写科技深圳有限公司 | Multi-platform equal-proportion self-adaptive track playing method |
| CN110781652B (en) * | 2019-09-27 | 2022-05-03 | 成都四方伟业软件股份有限公司 | Method and device for drawing particles and light effects on columnar chart |
| CN116501435B (en) * | 2023-06-28 | 2023-09-12 | 北京尽微致广信息技术有限公司 | Layout processing method and device and computer storage medium |
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| CN101271389A (en) * | 2008-04-08 | 2008-09-24 | 江苏科技大学 | Built-in intelligent information processing method for Tibetan |
| CN103885709A (en) * | 2011-09-30 | 2014-06-25 | 北京奇虎科技有限公司 | Webpage resizing and browsing method for portable mobile terminal |
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| FI20035250A (en) * | 2003-12-31 | 2005-07-01 | Nokia Corp | Organizing font scaling |
| WO2016045729A1 (en) * | 2014-09-25 | 2016-03-31 | Huawei Technologies Co.,Ltd. | A server for providing a graphical user interface to a client and a client |
| US10249073B2 (en) * | 2015-07-21 | 2019-04-02 | Intel Corporation | Distributed frame buffer and API for scalable parallel rendering |
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| CN101271389A (en) * | 2008-04-08 | 2008-09-24 | 江苏科技大学 | Built-in intelligent information processing method for Tibetan |
| CN103885709A (en) * | 2011-09-30 | 2014-06-25 | 北京奇虎科技有限公司 | Webpage resizing and browsing method for portable mobile terminal |
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