CN104537039B - A kind of image display method and its system - Google Patents
A kind of image display method and its system Download PDFInfo
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- CN104537039B CN104537039B CN201410811865.6A CN201410811865A CN104537039B CN 104537039 B CN104537039 B CN 104537039B CN 201410811865 A CN201410811865 A CN 201410811865A CN 104537039 B CN104537039 B CN 104537039B
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Abstract
The invention discloses a kind of image display method and its system, which includes：Be respectively created for store fade in image, the storage region of fade out image and mixed image, these storage regions are denoted as first area, second area and Mixed Zone；The transparency of each pixel of the image that fades out faded in image and second area in first area is repeatedly modified, is executed in each modification based on selected step-length；Fade in image and the image that fades out mix and the mixed image that will be mixed to get is stored into the Mixed Zone for modified every time, then the mixed image that this time is mixed to get is shown.The embodiment of the present invention can be adapted for various browsers, versatile, and can be realized the image display effect of delicate and smooth being fade-in fade-out.
Description
Technical field
The present invention relates to multimedia display field more particularly to a kind of image display methods and its system.
Background technique
Being fade-in fade-out for image is a kind of common Multimedia, and many multimedia making platforms, which all provide, generates image
Special display effect of being fade-in fade-out function, that more commonly used is Authorware and Flash.
Authorware is that one kind can process a variety of projects, including text, figure, sound, animation, video etc.
Platform.Made using Authorware image be fade-in fade-out effect when, need first with Photoshop make masking-out,
The Gradient Tool of Authorware is recycled to be handled.It is also a powerful more compared to Authorware, Flash
Media production platform, and make image be fade-in fade-out effect when be more easier, do not need by third party software, own
Manufacturing process can be realized in a figure layer.
In the effect of being fade-in fade-out for many times needing to realize image in webpage, the dynamic of web page contents can be realized in this way
State switching, makes webpage more characteristic.The figure that the effect of being fade-in fade-out of image uses browser included mostly is realized in webpage
Shape interface is realized.But since there are the browsers of compatibility issue, some customizations can not achieve the effect.For different customizations
Browsing area needs to be developed respectively, therefore can waste the time of a large amount of developers, and reduce development efficiency.
In summary various occasions realize the method that image is fade-in fade-out, and substantially exist problem following aspects：One
It is that function is simple, the made display effect of being fade-in fade-out come out is also limited.Second is that not having versatility, each platform for making
Can only self-dependent limited means production be applied to the image special effect of or one or two of other occasion itself.Third is that dynamic effect is not
Smoothness, on the one hand since effect of being fade-in fade-out needs a large amount of data to support, on the other hand since above-mentioned image is fade-in fade-out
Implementation method is all based on certain multimedia platform, and these multimedia platforms not only occupy a large amount of system resources, and do not have
Standby figure acceleration function.
To sum up, need it is a kind of with acceleration function and implementation method that the stronger image of versatility is fade-in fade-out, to solve
The above problem.
Summary of the invention
The first technical problem to be solved by the present invention is to provide a kind of with acceleration function and the stronger image of versatility
The implementation method being fade-in fade-out.
In order to solve the above-mentioned technical problems, the present invention provides a kind of image display methods, including：It is respectively created for depositing
Storage fade in image, the storage region of fade out image and mixed image, by these storage regions be denoted as first area, second area and
Mixed Zone；To the transparency of each pixel for fading in the image that fades out in image and second area in first area into
Row repeatedly modification, is executed in each modification based on selected step-length；Fade in image and the image that fades out for modified every time
Mix and store the mixed image being mixed to get into the Mixed Zone, the combination chart that then this time is mixed to get
As being shown.
Preferably, above-mentioned image display method is realized based on DirectFB engine.
Preferably, before the transparency to each pixel is modified, the Lock letter of DirectFB engine is utilized
Several storage regions to where the pixel lock.
Preferably, fade in the step of image is mixed with the image that fades out by modified every time：It first will modification
Then the image that fades out afterwards fades in image and mixes with the background as background by modified.
Preferably, image will be faded in using the Blit function of DirectFB engine and the image that fades out mixes.
Preferably, by every time it is modified fade in image and fade out image mixed the step of before, further include by
The transparency blending flag bit of Mixed Zone is provided with valid value.
Preferably, above-mentioned selected step-length is to carry out to the transparency for each pixel for fading in image and the image that fades out
The changing value of transparency when modification, the respectively independent choosing in 0~255 range according to the requirement for the display effect being fade-in fade-out
It is fixed.
Preferably, mixed image is shown using the Flip function of DirectFB engine.
On the other hand, a kind of image display system is additionally provided, including：Creation module is respectively created light for storing
Enter image, the storage region of fade out image and mixed image, these storage regions are denoted as first area, second area and mixing
Region；Module is revised, to each pixel for fading in the image that fades out in image and second area in first area
Transparency is repeatedly modified, and is executed in each modification based on selected step-length；Display module, will be modified every time
Fade in image and the image that fades out mix and store the mixed image being mixed to get into the Mixed Zone, then to this
The secondary mixed image being mixed to get is shown.
Compared with prior art, one or more embodiments in above scheme can have following advantage or beneficial to effect
Fruit：
Method used in the embodiment of the present invention can be realized the figure of delicate and smooth or the effect of being fade-in fade-out of text,
Moreover, because being to be realized based on the programming on bottom layer in the library DirectFB, therefore can be drawn suitable for various based on DirectFB
The extension of the bottom layer image effect for the browser held up can also act on other image special effects based on DirectFB engine and compile
Journey, it is versatile.
Other features and advantages of the present invention will be illustrated in the following description, and partly becomes from specification
It is clear that understand through the implementation of the invention.The objectives and other advantages of the invention can be by wanting in specification, right
Specifically noted structure is sought in book and attached drawing to be achieved and obtained.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example and is used together to explain the present invention, be not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is the flow diagram according to the image display method of the embodiment of the present application；
Fig. 2 is the schematic diagram of several image layers according to used in the image display method of the embodiment of the present application；
Fig. 3 is the flow diagram according to the transparency blending of the embodiment of the present application；
Fig. 4 is the structural schematic diagram according to the image display system of the embodiment of the present application.
Specific embodiment
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and examples, how to apply to the present invention whereby
Technological means solves technical problem, and the realization process for reaching technical effect can fully understand and implement.It needs to illustrate
As long as not constituting conflict, each feature in each embodiment and each embodiment in the present invention can be combined with each other,
It is within the scope of the present invention to be formed by technical solution.
It should be noted that the image display method of the embodiment of the present invention is based on the library DirectFB and by Alpha
The transparency value in channel is adjusted to realize.Although using such method, those skilled in the art can be with
Take according to actual needs other multimedia making platforms be also it is feasible, the selection of other platforms also belongs to essence of the invention
Mind and protection scope.In order to be best understood from the present invention, the statement of correlation involved in this paper is explained below.
DirectFB is to be concisely and efficiently architecture and hardware by the having for Convergence company exploitation of Germany
The library of figure acceleration function.It is the new graphics standard built on Framebuffer, Hardware graphics acceleration is provided, to defeated
Enter equipment to be handled and be abstracted, integrated windows system supports translucent window (surface) and multilayer (layer) display.
DirectFB can have preferable support to the GUI of embedded system.
The channel Alpha usually records the transparence information in image with the length of a byte.In general, can use
256 (0~255) grade gray scales define transparent, opaque and translucent area, wherein black expression all-transparent, white to indicate opaque, ash
Indicate translucent.In memory, the transparency value in the channel Alpha can occupy the memory space of a byte, such as 24
The true color system of position, a pixel data need to occupy the memory space of 4 bytes, and three bytes store RGB data respectively,
Another byte is used to store the transparency value in the channel Alpha.The formation of various image special effect effects can pass through tune
The transparency value in the channel Alpha is saved to realize.
The transparency value in the channel Alpha is adjusted as unit of pixel, so if to realize the multistage of transparency
It adjusts, calculation amount is still very considerable.The embodiment of the present invention modifies to transparency value using the library DirectFB, and
Since DirectFB has the function of Hardware graphics acceleration, can be adjusted based on hardware, it is achieved that effect of being fade-in fade-out
It is more smooth.
First embodiment
Fig. 1 is the flow diagram according to the image display method of the embodiment of the present application.It is described in detail below with reference to Fig. 1
Each step of this method.
Step S110, be respectively created for store fade in image, the storage region of fade out image and mixed image, by these
Storage region is denoted as first area, second area and Mixed Zone.
In DirectFB, the abstract window for temporarily storing a variety of operation objects is known as surface, i.e. image
Layer.It can be simply interpreted as holding the container of image or text.The overwhelming majority operation of DirectFB is in image layer
It completes.Pixel data in image layer is actually stored in memory, the memory either video card memory, can also
To be the memory of system, this is the performance that DirectFB has flexibility.
Under normal circumstances, the figure layer in image layer be not finally can directly show on the screen, if
User wants for the content of editor to be shown on screen, need one be located at top layer dedicated for display picture or video figure
As layer, it is referred to as primary surface, i.e. master image layer in DirectFB.
It should be noted that in DirectFB, master image layer also corresponds to one piece of region of memory in system, but and its
Unlike his image layer, the corresponding region of master image layer is one piece of specific region, and the content for writing this block memory can be automatic
It is shown on screen.User can not directly operate this block memory, but can be by by content copy to be shown to master image
The display of image on the screen is realized in layer.The same with other image layers, the corresponding region of memory of master image layer can also be
Before use, set in directfbrc file by user.Directfbrc is the configuration file of DirectFB, can be with
It is read on startup by all DirectFB application programs.
So in fact, this step is for creating three storage regions.Specifically, the storage region for fading in image is first
Region is named as image surface, i.e. picture image layer, and the storage region for the image that fades out is second area, is ordered
Entitled sub surface, i.e. bottom layer image layer.
Since when finally mixed, DirectFB is directly to mix to data stored in memory, so being
The picture for ensuring to show on screen does not mutate, and needing will by the picture image layer for fading in image in current primary image layer
The content (fade out image) of the position occupied is backed up.
The process of backup is, it is first determined the coordinate and region parameter that the image that fades out is displayed on the screen.With master image
The layer upper left corner is coordinate origin (0,0), and the coordinate for the image that obtains fading out according to the parameter that web page code is passed to determines to include cross
The parameter values such as coordinate, ordinate, the width of figure and height, are denoted as (x, y, width, height).Then it uses
Stretchblit function saves this block region duplication into bottom layer image layer.The calling form of stretchblit function
It is as follows：
sub->stretchblit(sub,primary,(x,y,width,height),NULL)；
Finally, it is also necessary to create the important Mixed Zone for being used to store mixed image, be named as mix
Surface, i.e. mixed image layer, all operations when carrying out Alpha mixing all carry out in this image layer, intermediate data
All stored through this image layer.Mixed image layer plays an important role in image blend, will be described hereinafter.
Fig. 2 is the schematic diagram of several image layers according to used in the image display method of the embodiment of the present application, from Fig. 2
In can clearly find out the content that each image layer i.e. storage region is stored.Wherein, 21 expressions is picture image layer, 22 tables
What is shown is bottom layer image layer, and 23 expressions are mixed image layers, and 20 expressions are master image layers.In mixed process, picture image
What is stored in layer is to fade in image, and what is stored in bottom layer image layer is the image that fades out.
It can be seen that the special effect method based on DirectFB by this step, be all directly internal by image layer
Row operation is deposited into, so the effect of being fade-in fade-out for the image made shows speed faster, picture can be more smooth.
Step S120, to each pixel for fading in the image that fades out in image and second area in first area
Transparency is repeatedly modified, and is executed in each modification based on selected step-length.
Firstly, the step-length selected here, refers to the transparency to each pixel for fading in image and the image that fades out
The changing value of transparency when modifying (twice between value).The ununified regulation of the value of specific step-length, main root
According to production effect, that is, the requirement of the display effect being fade-in fade-out determines.In general, can will every time to transparency value into
Changing value when row modification is taken as equal value, i.e., step-length is taken as definite value, and step-length value is not limited to 1.Choosing step-length
The number and the requirement of the fluency to display effect of operand are also contemplated that when numerical value.By right in (0~255) range
The transparency value in the channel Alpha carries out the other adjusting of arbitrary number of level, can produce special effect more abundant of being fade-in fade-out.
In addition importantly, in DirectFB, if to be operated to the single pixel of object, it is necessary to first to depositing
Storage area domain is locked, and otherwise can not be operated.Picture image layer and bottom layer image are locked respectively using Lock function
The storage region of layer, the calling form of Lock function are as follows：
tmp_surface->Lock(tmp_surface,DSLF_WRITE,&address,&pitch)；
Wherein, tmp_surface substitutes into image surface and sub surface respectively, can realize respectively to two
The locking of storage region.
There are also any it should be noted that the numerical value of transparency is adjusted as unit of pixel.Once modified
When, it needs all to modify to the transparency value of each of image layer pixel one by one.Such as assume in picture image layer
The Drawing Object that a width resolution ratio is 800 × 600 is stored, then need to repeat 800 × 600 modifications in primary modification,
It certainly is that basis thinks special efficacy effect to be achieved as previously mentioned, the numerical value of the transparency of each specific pixel is revised as how many
The fluency of fruit and special efficacy comprehensively considers to be arranged.
Step S130, by the modified combination chart for fading in image and the image that fades out carries out mixing and will be mixed to get every time
As storing into the Mixed Zone, then the mixed image that this time is mixed to get is shown.
Important function of the mixed image layer in image blend is embodied in, and the hybrid manipulation for fading in image and the image that fades out is
By carrying out hybrid manipulation with mixed image layer come what is realized respectively, before the mixing for carrying out image, need Mixed Zone
The transparency blending flag bit of (i.e. mixed image layer) is provided with valid value.
Transparency blending flag bit be defined in the library DirectFB one it is macro, it acts as if not mixed to transparency
It closes flag bit to be configured, then can only carry out the hybrid manipulation of three kinds of forms, i.e., it is transparent, translucent and opaque.If wanting (0
~255) transparency is adjusted in the range of, it is necessary to which transparency blending flag bit is provided with valid value.
It should be noted that transparency blending flag bit is defaulted as invalid state in DirectFB, need to be arranged just meeting
It comes into force, and transparency blending flag bit is only effective when doing Alpha mixing, so the state of flag bit does not have other aspects
It influences, without invalid state is set as again after the hybrid manipulation for completing transparency, only need to decide whether to reset as needed
?.The operational order of transparency blending flag bit is as follows：
mix->SetBlittingFlags(mix,flags)；
In above formula, about flag bit flags common operation there are several types of：Alpha mixing is opened, and uses image source
Alpha value when, flags DSBLIT_BLEND_ALPHACHANNEL；Alpha mixing is opened, and uses pixel
When Alpha value, flags DSBLIT_BLEND_COLORALPHA；Alpha flag bit flags is not configured, then not made
It is mixed with Alpha.
The specific mixing step for fading in image and the image that fades out is：By the storage region bottom layer image layer for the image that fades out with
The storage region mixed image layer of mixed image is mixed, and is as a result stored in the storage region of mixed image；Figure will be faded in
The storage region picture image layer of picture is mixed with the storage region mixed image layer of mixed image, is as a result stored in combination chart
In the storage region of picture.
It is especially noted that above-mentioned mixed process is required with strict sequence, to guarantee bottom after mixing
For tomographic image layer under, picture image layer, i.e., then again will be modified first using the modified image that fades out as background upper
Fade in image to mix with the background.Reach the image that picture image layer is stored to fade in, the image that bottom layer image layer is stored is light
Effect out.
The hybrid manipulation for fading in image and the image that fades out is completed by Blit function, and the calling form of Blit function is as follows：
mix->Blit(mix,sub,&src_rect,dest_rect.x,dest_rect.y)；
mix->Blit(mix,image,&src_rect,dest_rect.x,dest_rect.y)；
Further, effect of being preferably fade-in fade-out is realized, the setting of the numerical value of transparency can follow following one
As principle：
Firstly, since what is stored in picture image layer is to fade in image, so needing to make the transparent degree in its channel Alpha
Value is gradually increased to 255 since 0, is just able to achieve and fades in effect.Likewise, what is stored in bottom layer image layer is the image that fades out,
So the transparency value for making its channel Alpha is needed to gradually decrease to 0 since 255, it is just able to achieve effect of fading out.
Secondly, the variation of the transparency value in the channel Alpha of picture image layer and bottom layer image layer is independent from each other.
In other words, the two is changed without synchronizing.Such as the transparency value of picture image layer is changed to by 40 steps from 0
255, and the transparency value of bottom layer image layer changes to 0 from 255 by 50 steps, this is all allowed.
The mixed once of image with the storage region for the image that fades out is faded in every completion, it is necessary to correspondingly execute mixed once
The display of image.
It should be noted that master image layer does not need to be configured transparency blending flag bit herein.Because fading in
When image is mixed with the image that fades out, mixed image layer is to be mixed for stored picture image layer with bottom layer image layer
Intermediate data when conjunction, so needing to be configured the transparency blending flag bit of mixed image layer.And for master image
Layer, after having been completed the hybrid manipulation of picture image layer and bottom layer image layer, the image stored in mixed image layer is
With this feature of being fade-in fade-out, so make the fade effect of image more smooth to reduce operand, mixed image layer with
Master image layer is without being mixed.Since transparency blending flag bit is that default is invalid, so calling directly Flip function will
Mixed image layer is mixed with master image layer, is actually only equivalent to carry out simple translation, so that it may be realized mixed
Close the display of image.The calling form of Flip function is as follows：
primary->Flip(primary,NULL,0)；
It is primary shown in Fig. 3 completely according to the process signal mixed the step of the embodiment of the present application to transparency
Figure.In Fig. 3, bottom layer image layer is first mixed with mixed image layer, and mixing resultant is stored in mixed image layer, is then drawn
Face image layer is mixed with mixed image layer again, and mixing resultant is still stored in mixed image layer, and the mixing of two steps is all
Lightness mixing, so what is called is Blit function, it can be seen from the figure that storing in mixed image layer after the mixing of two steps
It is the image for realizing effect of being fade-in fade-out.As long as the content in mixed image layer is directly next moved to master image layer
It is shown, Flip function is called to complete.
Due to only opening transparency blending flag bit in the mixed process for fading in image and the image that fades out, fade in realization
While effect of fading out, operand is reduced, makes generated effect that there is better dynamic characteristic, while reducing hardware and setting
Standby expense.
The method of the embodiment of the present application is suitable for the bottom layer image effect of the various browsers based on DirectFB engine
Extension can also act on other image special effect programmings based on DirectFB engine.
Second embodiment
Fig. 4 is to illustrate this reality below with reference to Fig. 4 according to the structural schematic diagram of the image display system of the embodiment of the present application
Apply each section composition of example.
Specifically in Fig. 4, the creation module 41 of the present embodiment executes the operation of the step S110 of first embodiment, revises mould
Block 42 executes the operation of the step S120 of first embodiment, and display module 43 executes the operation of the step S130 of first embodiment.
It is no longer developed in details herein.
Those skilled in the art should be understood that each module of the above invention or each step can use general calculating
Device realizes that they can be concentrated on a single computing device, or be distributed in network constituted by multiple computing devices
On, optionally, they can be realized with the program code that computing device can perform, it is thus possible to be stored in storage
It is performed by computing device in device, perhaps they are fabricated to each integrated circuit modules or will be more in them
A module or step are fabricated to single integrated circuit module to realize.In this way, the present invention is not limited to any specific hardware and
Software combines.
While it is disclosed that embodiment content as above but described only to facilitate understanding the present invention and adopting
Embodiment is not intended to limit the invention.Any those skilled in the art to which this invention pertains are not departing from this
Under the premise of the disclosed spirit and scope of invention, any modification and change can be made in the implementing form and in details,
But scope of patent protection of the invention, still should be subject to the scope of the claims as defined in the appended claims.
Claims (4)
1. a kind of image display method, the method is realized based on DirectFB engine, including：
Be respectively created for store fade in image, the storage region of fade out image and mixed image, these storage regions are denoted as
First area, second area and Mixed Zone；
The transparency of each pixel for fading in the image that fades out in image and second area in first area is carried out more
Secondary modification is executed in each modification based on selected step-length；Wherein, it modifies in the transparency to each pixel
Before, the storage region where the pixel is locked using the Lock function of DirectFB engine；
Using DirectFB engine Blit function by every time it is modified fade in image and fade out image carry out mix and will mix
It closes obtained mixed image to store into the Mixed Zone, this time is mixed to get using the Flip function of DirectFB engine
Mixed image shown；Wherein, by every time it is modified fade in image and fade out image mixed the step of before,
It further include that the transparency blending flag bit of Mixed Zone is provided with valid value；
Wherein, the specific mixing step for fading in image and the image that fades out is：
The storage region for the image that fades out is mixed with the storage region of mixed image, is as a result stored in the storage of mixed image
In region；
The storage region for fading in image is mixed with the storage region of the mixed image, is as a result stored in the combination chart
In the storage region of picture.
2. display methods according to claim 1, which is characterized in that fading in image and the figure that fades out for modified every time
In as the step of being mixed：
First using the modified image that fades out as background, then fades in image by modified and mixed with the background.
3. display methods according to claim 1, which is characterized in that the selected step-length is image and to fade out to fading in
The changing value of transparency when the transparency of each pixel of image is modified, according to the display effect being fade-in fade-out
It is required that respectively independent selected in 0~255 range.
4. a kind of image display system, the system is realized based on DirectFB engine, including：
Creation module, be respectively created for store fade in image, the storage region of fade out image and mixed image, these are deposited
Storage area domain is denoted as first area, second area and Mixed Zone；
Module is revised, to the saturating of each pixel for fading in the image that fades out in image and second area in first area
Lightness is repeatedly modified, and is executed in each modification based on selected step-length；Wherein, the revision module is to each
Before the transparency of pixel is modified, using the Lock function of DirectFB engine to the storage region where the pixel
It is locked；
Display module fades in image and image progress of fading out for modified every time using the Blit function of DirectFB engine
It mixes and stores the mixed image being mixed to get into the Mixed Zone, using the Flip function of DirectFB engine to this
The secondary mixed image being mixed to get is shown；Wherein, the display module fades in image and fades out by modified every time
It further include that the transparency blending flag bit of Mixed Zone is provided with valid value before image is mixed；
Wherein, the display module is mixed especially by by the storage region of the storage region for the image that fades out and mixed image
It closes, is as a result stored in the storage region of mixed image；The memory block of the storage region and the mixed image of image will be faded in
Domain is mixed, and the mixing realized and fade in image with the image that fades out as a result is stored in the storage region of the mixed image.
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