CN107368430B - Method and device for reducing video memory - Google Patents
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Abstract
The embodiment of the invention provides a method and a device for reducing display memory, relates to the technical field of data storage, and solves the problem that when the existing display equipment displays a bitmap, the storage mode of each pixel in the decoded bitmap is ARGB _888 due to the fact that decoding is carried out in an ARGB _8888 decoding mode8, there is a problem of wasting a storage space. The specific scheme is as follows: determining attributes of the image; if the attribute representation image of the image does not contain transparency and is a gray image, storing the image in a video memory by adopting a first storage mode, wherein each pixel point in the image occupies 2 in the first storage modemBit storage mode; otherwise, storing the image in a display memory by adopting a second storage mode, wherein each pixel point in the image occupies 2 in the second storage modenBit storage mode; wherein n is greater than m.
Description
Technical Field
The invention relates to the technical field of data storage, in particular to a method and a device for reducing video memory.
Background
In the prior art, there are 4 common storage modes after bitmap decoding, which are ARGB _ 4444: that is, a is 4, R is 4, G is 4, B is 4, and thus a pixel occupies 4+4+4+ 16 bits, that is, 2 bytes of memory; ARGB _ 8888: that is, a is 8, R is 8, G is 8, and B is 8, then one pixel occupies 8+8+8+ 32 bits, that is, 4 bytes of memory; RGB _ 565: that is, R is 5, G is 6, B is 5, and there is no transparency, so that one pixel occupies 5+6+5, i.e., 16 bits, that is, 2 bytes of memory; ALPHA _ 8: only transparency and no color exist, one pixel occupies 8 bits, namely 1 byte of memory. Therefore, the ARGB _8888 storage mode is the most memory occupied. The higher the median number of the storage mode is, the more color information can be stored, and the more vivid the image is.
Wherein, the storage mode of ARGB _4444 is abandoned by the android system of the high version; the storage of ALPHA _8 is also abandoned since it cannot store color information; the storage mode of ARGB _8888 is the default storage mode of the android system after bitmap decoding.
Specifically, when the existing display device using the android system displays a bitmap, first, an encoded bitmap (i.e., a bitmap to be displayed) is obtained from a disk, then the encoded bitmap is decoded in an ARGB _8888 decoding manner, and the decoded bitmap is stored in a display memory according to an ARGB _8888 storage manner. And finally, when the display screen displays the bitmap, reading a digital signal corresponding to the bitmap to be displayed from the display memory, converting the digital signal into an analog signal and outputting the analog signal to the display screen.
However, in the prior art, all bitmaps are decoded by using the ARGB _8888 decoding method, that is, each pixel in the decoded bitmap is stored in the ARGB _8888 decoding method, that is, each pixel in the decoded bitmap occupies 4 bytes. When the method is applied to an ink screen to display a bitmap, because the ink screen displays a gray image, if the storage mode of each pixel in all decoded bitmaps is ARGB _8888, the problem of wasting storage space exists.
Disclosure of Invention
The embodiment of the invention provides a method and a device for reducing display memory, which solve the problem that when the existing display equipment displays a bitmap, because decoding is carried out by adopting an ARGB _8888 decoding mode, the storage mode of each pixel in the decoded bitmap is also ARGB _8888, and the storage space is wasted.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect, a method for reducing video memory is provided, including:
determining attributes of the image; the attribute of the image is used for representing whether the image contains transparency and is a gray level image;
if the attribute of the image represents that the image does not contain transparency and is a gray image, storing the image in a video memory by adopting a first storage mode, wherein each pixel point in the image occupies 2mBit storage mode;
otherwise, storing the image in a display memory by adopting a second storage mode, wherein each pixel point in the image occupies 2 in the second storage modenBit storage mode; wherein n is greater than m.
In a second aspect, an apparatus for reducing video memory is provided, including:
a determining module for determining an attribute of the image; the attribute of the image is used for representing whether the image contains transparency or not and whether the image contains the transparency or not is a gray image;
a storage module, configured to store the image in a video memory in a first storage manner if the attribute of the image determined by the determination module indicates that the image does not include transparency and is a grayscale image, where the first storage manner is that each of the imagesPixel point occupying 2mBit storage mode;
the storage module is further configured to store the image in a video memory in a second storage manner if the attribute of the image determined by the determination module represents that the image contains transparency and/or is not a grayscale image, where the second storage manner is that each pixel point in the image occupies 2nBit storage mode; wherein n is greater than m.
According to the method and the device for reducing the video memory, provided by the embodiment of the invention, by determining the attribute of the image, if the attribute representation image of the image does not contain transparency and is a gray image, the image is stored in the video memory in a first storage mode; otherwise, the image is stored in the display memory by adopting a second storage mode. The second storage mode occupies larger bits than the first storage mode. Compared with the prior art, the method and the device can dynamically select the corresponding storage mode according to the attributes of different images. And a large number of experiments prove that the difference of subjective display effects is small when the bitmap stored in the storage mode corresponding to the image attribute is displayed. Therefore, compared with the prior art in which the partial images are stored in the second storage mode for all attributes, the storage space of the video memory can be effectively reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a method for reducing video memory according to an embodiment of the present invention;
fig. 2 is a diagram of an apparatus for reducing video memory according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The main execution body of the method for reducing the video memory provided by the present invention is a device for reducing the video memory, and the device may be an electronic device including a display screen for executing the method, such as a computer, a mobile phone, a tablet computer, a display, an electronic book, and the like having a display function, or may be a hardware module and/or a software module that can be applied to the electronic device, and may include a Central Processing Unit (CPU) in the electronic device, for example. It should be noted that the display screen may be a color screen or an ink screen.
It should be noted that in the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
For the convenience of clearly describing the technical solutions of the embodiments of the present invention, in the embodiments of the present invention, the words "first", "second", and the like are used to distinguish the same items or similar items with basically the same functions or actions, and those skilled in the art can understand that the words "first", "second", and the like do not limit the quantity and execution order.
In the embodiments of the present invention, "of", "corresponding" and "corresponding" may be mixed, and it should be noted that the intended meaning is consistent when the difference is not emphasized.
An embodiment of the present invention provides a method for reducing video memory, as shown in fig. 1, the method specifically includes the following steps:
101. attributes of the image are determined.
The attributes of the image are used for representing whether the image contains transparency or not and whether the image is a gray level image or not.
Alternatively, the image may be in two forms, specifically as follows:
in a first form: a decoded image.
Illustratively, before determining the attributes of the image, the encoded image is first decoded in an existing decoding manner, that is, the encoded image is decoded in an ARGB _8888 decoding manner, and each pixel in the decoded image is represented in the form of ARGB _ 8888.
Optionally, if the image in step 101 is a decoded image, the image is an image in an ARGB color mode, and the determining of the attribute of the image in step 101 is specifically implemented by the following method:
and determining the attribute of the image according to the ARGB color mode of the image.
Specifically, when the value of the a channel in each pixel of the image is 255, the characterization image does not include transparency. When the pixel values of the three components of RGB are equal, the image is determined to be a grayscale image. Correspondingly, when the value of the a channel of a certain pixel in the image is not 255, the characterization image contains transparency. When the pixel values of the three RGB components of a certain pixel in an image are not equal, it is determined that the image is not a grayscale image.
It should be noted that any method for determining whether an image includes transparency and is a grayscale image according to the ARGB information is within the scope of the present invention.
In a second form: the image before decoding.
For example, if the image in step 101 is an image before decoding, the image in step 101 is an encoded image. The images at this time are images of various storage formats, such as PNG, JPG, and PCX, and so on.
Optionally, if the image in step 101 is an image before encoding, determining the attribute of the image according to the following two ways, specifically as follows:
a. and determining whether the image contains transparency and is a gray image according to the extension of the image.
Illustratively, the extension of the image described above indicates a storage format of the image. And if the extension name of the image is gray, judging that the image does not contain transparency and is a gray image.
Alternatively, the first and second electrodes may be,
b. and determining whether the image contains transparency and is a gray image according to the attribute field in the file header of the image.
For example, the attribute field in the file header of the image is a field of a file type in the file header (i.e., a filetype corresponding field), and indicates the type of the image. If the field is gray, it indicates that the image does not include transparency and is a gray image.
It should be noted that, the above-mentioned method for determining whether an image includes transparency and is a grayscale image according to the extension of the image and the attribute field in the file header is only an example, and any method for determining whether an image includes transparency and is a grayscale image according to the information stored in the image is within the scope of the present invention.
And 102a, if the attribute representation image of the image does not contain transparency and is a gray image, storing the image in a video memory by adopting a first storage mode.
Wherein, the first storage mode is that each pixel point in the image occupies 2mBit storage mode.
102b, otherwise, storing the image in a video memory by adopting a second storage mode. That is, if the attribute representation image of the image includes transparency and/or is not a grayscale image, the image is stored in the video memory in the second storage mode.
Wherein, the second storage mode is that each pixel point in the image occupies 2nBit storage mode; and n is greater than m.
Optionally, the first storage manner is RGB _565, that is, one pixel occupies 16 bits and 2 bytes of memory space. The second storage manner is ARGB _8888, that is, one pixel occupies 32 bits and 4 bytes of memory space (in this application, video memory space).
Optionally, based on the introduction of step 101, if the image in step 102(102a, 102b) is a decoded image and the storage manner of the decoded image is ARGB _8888, when the attribute representation image of the image includes a transparent image and/or is not a grayscale image, the storage manner of the image is kept unchanged, that is, the image is stored in the video memory by using the second storage manner. If the attribute of the image indicates that the image does not contain transparency and is a gray image, the storage mode of the image is changed from the original second storage mode to the first storage mode, namely the storage mode of the image is changed from the original ARGB _8888 to RGB _ 565.
Optionally, based on the introduction of step 101, if the image in step 102(102a, 102b) is an image before decoding, when it is determined that the attribute representation image of the image does not include transparency and is a grayscale image, the storing of the image in step 102a in the video memory in the first storage manner specifically includes:
102a1, decoding the image in a decoding mode adapted to the first storage mode, and storing the decoded image in the video memory in the first storage mode.
Correspondingly, based on the introduction of step 101, if the image in step 102(102a, 102b) is an image before decoding, when it is determined that the attribute characterization image of the image includes transparency and/or is not a grayscale image, the step 102a stores the image in the video memory in the second storage manner, which specifically includes:
102b1, decoding the image in a decoding mode suitable for the second storage mode, and storing the decoded image in the video memory in the second storage mode.
Illustratively, the decoding method adapted to the first storage method is to configure the inprefredconfig parameter in the decoding algorithm as the first storage method, that is, configure the inprefredconfig parameter in the decoding algorithm as RGB _ 565; the decoding method adapted to the second storage method is to configure the inprefreconfig parameter in the decoding algorithm as the second storage method, that is, configure the inprefreconfig parameter in the decoding algorithm as ARGB _ 8888. After the inprefredconfig parameter is set, the decoded image is stored in a storage mode corresponding to the inprefredconfig parameter.
Although the conventional android system discards the storage method of ARGB _4444, the other systems do not discard the storage method of ARGB _ 4444. Therefore, for other systems except for the android system, the method provided by the scheme can further include that whether the image is a gray image or not is represented by the attribute of the image. If the image is a gray image, storing the image by adopting an ARGB _4444 storage mode; otherwise, the image is stored in the ARGB _8888 storage mode. Further, when the image is determined to be a gray image, the attribute of the image may also represent whether the image includes transparency. If yes, keeping the storage mode of ARGB _4444 unchanged; if not, the image is stored in a storage mode of RGB _ 565. It should be further noted that the method for determining whether an image is a grayscale image and whether the image includes transparency is the same as the determination method in the solution provided in the present application, and details are not repeated here.
According to the method and the device for reducing the video memory, provided by the embodiment of the invention, by determining the attribute of the image, if the attribute representation image of the image does not contain transparency and is a gray image, the image is stored in the video memory in a first storage mode; otherwise, the image is stored in a second storage mode. The second storage mode occupies larger bits than the first storage mode. Compared with the prior art, the method and the device can dynamically select the corresponding storage mode according to the attributes of different images. And a large number of experiments prove that when the bitmap stored by the storage mode corresponding to the image attribute is displayed, the difference between the subjective display effect and the display effect of the bitmap stored by the second storage mode for the images with all the attributes in the prior art is very small. Therefore, compared with the prior art in which the partial images are stored in the second storage mode for all attributes, the storage space of the video memory can be effectively reduced.
The present invention provides a device for reducing memory, such as the schematic structural diagram of a device for reducing memory shown in fig. 2, the device includes: a determining module 21 and a storing module 22, wherein:
a determining module 21 for determining an attribute of the image; the attributes of the image are used to characterize whether the image contains transparency and is a grayscale image.
A storage module 22, configured to store the image in a video memory in a first storage manner if the determining module 21 determines that the attribute representation image of the image does not include transparency and is a grayscale image, where the first storage manner is that each pixel in the image occupies 2mBit storage mode.
The storage module 22 is further configured to, if the attribute characterization image of the image determined by the determining module 21 includes transparency and/or is not a grayscale image, store the image in the video memory in a second storage manner, where the second storage manner is that each pixel in the image occupies 2nBit storage mode; wherein n is greater than m.
Optionally, the determining module 21 is configured to:
and determining whether the image contains transparency and is a gray image according to the extension of the image.
Alternatively, the first and second electrodes may be,
and determining whether the image contains transparency and is a gray image according to the attribute field in the file header of the image.
Optionally, the storage module 22 is configured to:
decoding the image which is determined by the determining module 21 and does not contain transparency and is a gray level image in a decoding mode adaptive to the first storage mode, and storing the decoded image in a video memory by adopting the first storage mode; and decoding the image which is determined by the determining module 21 and contains the transparency and/or is not the gray level image in a decoding mode which is adaptive to the second storage mode, and storing the decoded image in the video memory in the second storage mode.
Optionally, the determining module 21 is configured to determine an attribute of the image according to an ARGB color mode of the image.
Optionally, the first storage manner is RGB _565, and the second storage manner is ARGB _ 8888.
According to the method and the device for reducing the video memory, provided by the embodiment of the invention, by determining the attribute of the image, if the attribute representation image of the image does not contain transparency and is a gray image, the image is stored in the video memory in a first storage mode; otherwise, the image is stored in a second storage mode. The second storage mode occupies larger bits than the first storage mode. Compared with the prior art, the method and the device can dynamically select the corresponding storage mode according to the attributes of different images. And a large number of experiments prove that when the bitmap stored by the storage mode corresponding to the image attribute is displayed, the difference between the subjective display effect and the display effect of the bitmap stored by the second storage mode for the images with all the attributes in the prior art is very small. Therefore, compared with the prior art in which the partial images are stored in the second storage mode for all attributes, the storage space of the video memory can be effectively reduced.
It should be noted that, in a specific implementation process, each step executed by the method for reducing video memory shown in fig. 1 may be implemented by a processor in a hardware form executing a computer execution instruction in a software form stored in a memory, and is not described herein again to avoid repetition. The program corresponding to the action executed by the method for reducing the video memory can be stored in the memory implemented by the method for reducing the video memory in a software form, so that the processor can call and execute the operation corresponding to each unit.
The memory above may include volatile memory (volatile memory), such as random-access memory (RAM); a non-volatile memory (non-volatile memory) such as a read-only memory (ROM), a flash memory (flash memory), a hard disk (HDD) or a solid-state drive (SSD); combinations of the above categories of memory may also be included.
The processor in the above-provided apparatus may be one processor or may be a collective term for a plurality of processing elements. For example, the processor may be a central processing unit (CPU; other general purpose processors, Digital Signal Processor (DSP), Application Specific Integrated Circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, etc.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be physically included alone, or two or more units may be integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the modules described above may refer to the corresponding process in the foregoing method embodiments, and is not described herein again.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for reducing video memory is characterized by comprising the following steps:
determining attributes of the image; the attribute of the image is used for representing whether the image contains transparency and is a gray level image;
if the attribute of the image represents that the image does not contain transparency and is a gray image, storing the image in a video memory by adopting a first storage mode, wherein each pixel point in the image occupies 2mBit storage mode;
otherwise, storing the image in a display memory by adopting a second storage mode, wherein each pixel point in the image occupies 2 in the second storage modenBit storage mode; wherein n is greater than m.
2. The method of claim 1, wherein determining attributes of the image comprises:
determining whether the image contains transparency and is a gray image according to the extension of the image;
alternatively, the first and second electrodes may be,
and determining whether the image contains transparency and is a gray image according to the attribute field in the file header of the image.
3. The method according to claim 2, wherein the storing the image in a video memory in a first storage manner comprises:
decoding the image in a decoding mode adaptive to the first storage mode, and storing the decoded image in a video memory in the first storage mode;
the storing the image in a display memory by adopting a second storage mode comprises:
and decoding the image in a decoding mode adaptive to the second storage mode, and storing the decoded image in a video memory in the second storage mode.
4. The method of claim 1, wherein the image is an image in ARGB color mode, and wherein determining attributes of the image comprises:
and determining the attribute of the image according to the ARGB color mode of the image.
5. The method of any of claims 1-4, wherein the first storage mode is RGB _565 and the second storage mode is ARGB _ 8888.
6. An apparatus for reducing video memory, comprising:
a determining module for determining an attribute of the image; the attribute of the image is used for representing whether the image contains transparency and is a gray level image;
a storage module, configured to store the image in a video memory in a first storage manner if the attribute of the image determined by the determination module indicates that the image does not include transparency and is a grayscale image, where the first storage manner is that each pixel in the image occupies 2mBit storage mode;
the storage module is further configured to store the image in a video memory in a second storage manner if the attribute of the image determined by the determination module represents that the image contains transparency and/or is not a grayscale image, where the second storage manner is that each pixel point in the image occupies 2nBit storage mode; wherein n is greater than m.
7. The apparatus of claim 6, wherein the determining module is configured to:
determining whether the image contains transparency and is a gray image according to the extension of the image;
alternatively, the first and second electrodes may be,
and determining whether the image contains transparency and is a gray image according to the attribute field in the file header of the image.
8. The apparatus of claim 7, wherein the storage module is configured to:
decoding the image which is determined by the determining module and does not contain transparency and is a gray level image in a decoding mode adaptive to the first storage mode, and storing the decoded image in a video memory by adopting the first storage mode;
and decoding the image which is determined by the determining module and contains the transparency and/or is not the gray level image in a decoding mode which is adaptive to the second storage mode, and storing the decoded image in a video memory by adopting the second storage mode.
9. The apparatus of claim 6, wherein the image is an ARGB color mode image, and wherein the determination module is configured to:
and determining the attribute of the image according to the ARGB color mode of the image.
10. The apparatus according to any of claims 6-9, wherein the first storage means is RGB _565 and the second storage means is ARGB _ 8888.
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Address after: 266071 Shandong city of Qingdao province Jiangxi City Road No. 11 Patentee after: Qingdao Hisense Mobile Communication Technology Co.,Ltd. Address before: 266071 Shandong city of Qingdao province Jiangxi City Road No. 11 Patentee before: HISENSE MOBILE COMMUNICATIONS TECHNOLOGY Co.,Ltd. |