JP2005275036A - Display data compositing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display data compositing device which can improve the system performance by compositing only the updated part. <P>SOLUTION: This device has an image memory 302, an updating detector 304, a detector 306 to find continuously updating areas, and a compositing means 307. The update detector 304 detects if there is updating, and the detector 306 detects continuously updating areas. Thus, the compositing means 307 can composite only the area which is the sum of the continuously update areas of the image data. Accordingly, it can carry out required compositing, without increasing the load on the hardware which performs memory transfer and compositing, even when partly updating the image data. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is a technique for displaying data obtained by combining a plurality of screens on a display screen typified by a CRT or a liquid crystal, and more specifically, combining image data of a plurality of image layers on a physical memory. The present invention relates to a display data synthesizing apparatus that transfers synthesized data created in this way as display data to a display screen.

  Conventionally, in an information processing terminal such as a computer, a device or system having a display means such as a CRT or a liquid crystal has a plurality of image layers, and the image data corresponding to the plurality of image layers is synthesized and created. By transferring the composite data as display data to the display means, display on the screen is performed. The plurality of image layers may be expressed as a screen layer, a display plane, an image frame, or the like, and a single screen (image) to be displayed on the display device can be generated by superimposing them. For example, an image layer that displays display contents that change at high speed, such as a moving image or a display screen during a game, and an image layer that displays display contents that are fixed for a certain time and do not change, represented by character information, When these two image layers are superimposed and displayed, the composite data created by periodically synthesizing the image data on each image layer is transferred to the display means as display data. The screen is displayed by redisplaying.

  However, since the composition processing of a plurality of image layers is generally realized by arithmetic processing and memory copy processing in units of corresponding pixels on the coordinates displayed on the display means, The hardware processing load such as a CPU and the memory bus occupation ratio tend to increase in proportion to the number of pixels to be configured and the frequency of synthesis.

  As a result, in a device or system with poor hardware performance, the system performance deteriorates if display data for one large screen is frequently combined. In addition, in devices and systems that require battery operation, such as portable devices, continuous operation time decreases due to the power consumption of hardware that performs processing represented by the CPU by frequently repeating large-capacity synthesis processing. To do.

  In order to solve this problem, there is a technique that performs a synthesis process only when image data to be synthesized is updated (see, for example, Patent Document 1). FIG. 5 shows a conventional display data synthesizing method described in Patent Document 1.

  In FIG. 5, reference numeral 101 denotes an image layer memory, which is a memory area having a plurality of image layers (110 (1) to 110 (N)) and a composite layer 120 created by combining them. Reference numeral 102 denotes a display monitor, which is a display device such as a CRT or a liquid crystal that displays a composite layer. Reference numeral 103 denotes an image supply unit that supplies a composite layer 120 created by combining a plurality of image layers (110 (1) to 110 (N)) included in the image layer memory 101 to the display monitor 102. . A frame update flag 104 identifies whether or not each image layer is updated. A drawing control circuit 105 sets the frame update flag 104 while monitoring the update state of the image layer memory 101. Reference numerals 110 (1) to 110 (N) denote image layers, which are image data on each image layer stored in the image layer memory 101. Reference numeral 120 denotes a composite layer, which is composite layer data (composite data) created by combining image data of the image layers 110 (1) to 110 (N). For example, as shown in FIG. 7, the image data (601 and 602) of two image layers are synthesized to create synthesized data 603, and this synthesized data is displayed on the display screen.

With the above configuration, when the drawing control circuit 105 detects that the image layers 110 (1) to 110 (N) included in the image layer memory 101 are updated, the frame update flag 104 is set, and the image supply unit 103 is set. When the frame update flag 104 indicates that there is an update, the image data of the image layers 110 (1) to 110 (N) is synthesized, stored as synthesized data in the synthesized layer 120 and supplied to the display monitor 102, When the frame update flag 104 indicates no update, the synthesized data already stored in the synthesis layer 120 is supplied to the display monitor 102 without performing the synthesis operation.
JP 2002-182632 A

  However, in the conventional configuration, since the update region of the image layer is local and it is not necessary to perform a compositing operation for all the pixels constituting the screen layer, the compositing operation is performed, so the compositing operation is performed. There has been a problem that the amount of memory transfer and the amount of arithmetic processing accompanying the operation become unnecessarily large.

  This problem will be described with reference to the drawings. FIG. 6 is a diagram schematically showing an example of display data in a general computer system including the conventional technology and display means such as a CRT. In this example, the synthesis of two image layers will be described for simplification of description.

  Reference numerals 201 and 211 denote image layer image data corresponding to the size of one display screen of the display unit. The image data 201 and 211 are composed of small rectangular sets called pixels, such as 202, 203, 204, 212, 213, and 214.

  Reference numeral 221 denotes composite data, which is composed of the result of combining (calculating) the pixels of the image data 201 and 211 having the same display unit coordinates. Specifically, the pixel 222 is the result of combining 202 and 212, the pixel 223 is the result of combining 203 and 213, and the pixel 224 is the result of combining 204 and 214.

  When each pixel in the composite data 221 is determined by only the calculation result between the pixels on the image data 201 and 211 that are the same in the coordinates of the display means, only a part of the image data 201 or 211 is updated. In this case, in the conventional configuration, since all the pixels included in the image data 201 and 211 are combined, it is necessary to execute only the combining processing related to the updated pixel again. Load increases.

  In the conventional configuration, as represented by a computer game, in a system in which local image data is frequently updated in a short time by a user operation or the like, the frame update flag 104 is always updated. It is set and the synthesis process is continuously performed. In a general computer system, update of image data is data writing to physical memory, and composition processing is data reading from physical memory and data transfer to hardware for performing composition processing. Writing to and reading from the memory will occur frequently. For this reason, in a system in which the transfer performance of a memory bus connected to a physical memory, such as a cellular phone, is poor, there is a problem that the performance of the system deteriorates.

  The present invention solves the above-mentioned conventional problems, and it is possible to realize improvement in system performance by synthesizing a physically continuous area including an updated portion at a predetermined time. An object of the present invention is to provide a display data synthesizing device capable of performing the above.

  In order to solve the above-described conventional problems, the present invention is an apparatus that transfers display data to a display device that displays display data on a screen, and two or more images that can be displayed on the screen of the display device. Image data storage means for storing image data for layers, drawing means for drawing image data in the image data storage means, and update detection means for detecting update of each image data stored in the image data storage means And, when the update detection unit detects an update for one or more image data, a continuous update region detection unit that detects a respective continuous update region in each image layer in which the update is detected; The continuous update area is a continuous area in a physical address including all update areas in the image data in which update is detected, and the continuous update area is an image of the display device. A synthesis unit that synthesizes the synthesis region of the two or more pieces of image data, with a synthesis region corresponding to a region that is a union on the coordinates of And a synthesized data transfer means for transferring the synthesized data as display data to the display device.

  With this configuration, when the update of each image data is partial, only the area corresponding to the union is combined to suppress the memory transfer amount associated with the combining operation and the hardware processing load for combining. be able to.

  Further, according to the present invention, the composition unit further includes the continuous image data of N screens, with a continuous region in a physical address including all the one or more composition regions in each image data as a continuous composition region. A synthesis region is synthesized.

  With this configuration, a continuous area including all the update areas can be synthesized, and the data read process from the physical memory in which each screen data is stored can be performed once during the synthesis process. The CPU processing load can be reduced by using a DMA transfer method that does not require the.

  In addition, the present invention further instructs the update detection unit to detect the update of each image data stored in the image data storage unit at a predetermined time. Periodic synthesizing means is provided for instructing the synthetic data transfer means to transfer the synthetic data obtained by the instruction.

  With this configuration, even when image data updates frequently occur in a short time, by detecting a continuous area in a physical address that includes all image data updates performed during a predetermined time, It is possible to reduce hardware for performing synthesis processing and memory read load.

  Furthermore, the present invention further provides a composition during drawing that prohibits transfer of composite data to the composite data transfer means when the drawing means is drawing on any image data included in the image data storage means. Data transfer inhibiting means is provided.

  With this configuration, it is possible to prevent the synthesis process from being performed during the drawing process.

  According to the display data synthesizing device of the present invention, when the update of each image data is partial, only the area corresponding to the union of the areas when each image data update area is displayed on the screen of the display means. By performing the synthesis process, it is possible to suppress the processing load of the hardware that performs the synthesis.

  In addition, even when image data updates frequently occur in a short time, a composition process is performed by detecting a continuous area in a physical address including all image data updates performed during a predetermined time. Can be performed without frequent occurrences of hardware and memory, and the load on hardware and memory can be reduced.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram showing an example of the configuration of a display data synthesizing apparatus according to an embodiment of the present invention.

  In FIG. 1, a display unit 301 is a display unit such as a CRT or a liquid crystal, and receives transferred display data and displays the received display data on a screen.

  Image data 320 (1) to 320 (N) is image data on N (N is an integer of 2 or more) image layers each having a size corresponding to one screen of the display unit 301. The composite data 340 is data obtained by combining the image data 320 (1) to 320 (N), and is constituted by a result of combining (calculating) pixels having the same coordinates of the display unit 301. FIG. 2 shows an example of these data. Note that i is an integer of 2 or more and N or less. In the continuous update area 305 (i) (pointing to the hatched rectangle in the figure) included in the image data 320 (i), the image data 320 (i) stored in the image data storage unit 302 is updated by the drawing unit 303. In this case, it is a continuous area in the physical address including all the update areas. The composite area 330 (i) is an area determined from the continuous update areas 305 (1) to 305 (N) of all the image layers, and the composite areas 330 (1) to 330 on the N image layers. (N) is synthesized to create synthesized data 340. The area 341 in the synthesized data 340 corresponds to the area re-synthesized by being updated.

  The image data storage means 302 is a storage area for storing 320 (1) to 320 (N), which is image data of N image layers, and the composite data 340. Generally, it is a physical memory such as a RAM, which is secured on a memory device.

  The receiving unit 310 instructs the drawing unit 303 to draw image data when the data to be displayed is updated and the screen needs to be updated.

  The drawing unit 303 updates the image data stored in the image data storage unit 302 by drawing the update target data in the image data storage unit 302. That is, writing to the physical memory is performed.

  The update detection unit 304 is a unit that detects an update of the image data 320 (1) to 320 (N) stored in the image data storage unit 302. The update of the image data is determined as having been updated when there is unsynthesized image data by the drawing means 303 drawing the image data after the combined data is displayed as display data on the display means 301.

  The continuous update region detection unit 306 is a unit that detects the respective continuous update regions 305 (1) to 305 (N) of the image data 320 (1) to 320 (N) in the image data storage unit 302. As the information of the continuous update areas 305 (1) to 305 (N), the offset information having the smallest physical address and the size of the continuous update areas 305 (1) to 305 (N) (counted from the offset information) Determine the value required to include all display data). Note that the information in the continuous update areas 305 (1) to 305 (N) is not limited to this, and may be a start physical address and an end physical address.

  The synthesizing unit 307 determines the synthesis areas 330 (1) to 330 (N) determined from the continuous update areas 305 (1) to 305 (N), and the synthesis area 330 (1) on the N image layers. ˜330 (N) are combined and stored in the image data storage unit 302. The details of the composite area determination process are shown in FIG. 3 and will be described later.

  The composite data transfer unit 350 is a unit that transfers the composite data 340 to the display unit 301 as display data.

  The periodic update unit 308 instructs the update detection unit 304 to detect the update of the image data stored in the image data storage unit 302 at predetermined time intervals. When the detection result is received from the update detection unit 304 and there is an update, the synthesis unit 307 is instructed to synthesize the synthesis areas 330 (1) to 330 (N), and the synthesis data transfer unit 350 is instructed to transfer the synthesis data 340. .

  The drawing composition inhibiting unit 309 performs control so that the composition unit 307 does not perform composition processing while the drawing unit 303 is drawing in the image data storage unit 302. More specifically, when the drawing start is notified from the drawing unit 303, the drawing-in-combination suppressing unit 309 instructs the combining unit 307 to prohibit the combining. Further, when the drawing unit 303 is notified of the end of drawing, the combining unit 307 is instructed to cancel the prohibition of combining. As a result, the synthesizing unit 307 does not perform the actual synthesizing process even if the synthesizing is instructed from the period updating unit 308 while the synthesis is prohibited. That is, only when the image data is updated and the composition is not prohibited, the composition processing by the composition unit 307 is performed.

  As described above, when the image data is updated and the composite data needs to be redisplayed, the drawing unit 303 redraws the image data 320 (1) to 320 (N) in the image data storage unit 302. By detecting the update at predetermined time intervals, when there is an update, the combining unit 307 combines only the data stored in the combining areas 330 (1) to 330 (N) to generate the combined data 340. , And the composite data transfer means 350 transfers it to the display means 301, so that the display means 301 redisplays the screen.

  The display unit 301 may be built in the same device as the display data synthesizing device, or may be configured to display an image by connecting an external display device.

  The functional blocks such as the drawing unit 303, the update detection unit 304, the continuous update area detection unit 306, the synthesis unit 307, the image data storage unit 302, and the composite data transfer unit 350 may be realized as an LSI that is an integrated circuit. Good. In this case, it may be individually made into one chip, or may be made into one chip so as to include a part or all of it. Further, if integrated circuit technology comes out to replace LSI's as a result of the advancement of semiconductor technology or a derivative other technology, it is naturally also possible to carry out function block integration using this technology. Biotechnology can be applied.

  In addition, when image data writing to the image data storage unit 302 can be processed in a short time, such as when the screen size is small and the writing speed to the physical memory is fast, it is not necessary to suppress the synthesis, so drawing is in progress. The synthesis inhibiting unit 309 may not be provided. In addition, the period update unit 308 performs update detection every predetermined time. However, at the timing when the drawing unit 303 redraws and updates the image data, the synthesis unit 307 is instructed to perform synthesis, and the combined data The transfer unit 350 may be instructed to transfer the composite data 340.

  Next, the details of the synthesis area determination process in the synthesis unit 307 will be described with reference to FIG.

  FIG. 3 is a diagram schematically showing an example of display data in a general computer system including the present invention and display means such as a CRT as in FIG. In this example, for simplification of description, the synthesis with two image layers is illustrated, but the same can be considered with N image layers.

  Reference numerals 401 and 421 denote image layer image data corresponding to the size of one display screen of the display unit 301, respectively. Similar to the image data 201 in FIG. 6, the image data 401 and 421 are composed of a set of small rectangles called pixels. Here, it is assumed that information of all the pixels constituting the image data 401 and 421 is sequentially stored in the horizontal direction starting from the upper left in the physical memory (image data storage unit 302).

  The case where the areas updated by the drawing unit 303 are the area 402 in the image data 401 and the area 422 in the image data 421 will be specifically described as an example.

  The continuous update area detection unit 306 detects a continuous update area of the image data 401. The continuous update area is an area continuous on the physical memory including the entire update area 402, and corresponds to the area 403 in FIG. Similarly, an area 423 in FIG. 3 that is a continuous area on the physical memory including the entire update area 422 of the image data 421 is detected as a continuous update area of the image data 421.

  The synthesizing unit 307 determines the synthesizing regions 404 and 424 on the image data 401 and 421 as the union region when the continuous update regions 403 and 423 are mapped to the coordinate axes of the same display unit. Here, the synthesis areas 404 and 424 are areas including the continuous update areas 403 and 423, respectively.

  As shown in FIG. 3B, the synthesizing unit 307 may determine continuous synthesis areas 405 and 425, which are continuous areas on the physical memory, as synthesis areas.

  Note that the synthesis areas 404 and 424 and the continuous synthesis areas 405 and 425 may be larger areas including themselves.

  In FIG. 3, for the sake of simplification of description, the composition of the image data of the two image layers is described. However, in the composition of N (N is an integer of 2 or more), the composition unit 307 is similar to FIG. 3. The synthesis area may be determined from the union of continuous areas including the update area on the N screens by a technique.

  FIG. 4 is a flowchart showing the image data combining operation of the display data combining apparatus according to the present embodiment. The operation of the display data synthesizing apparatus can be divided into three processes: a drawing process in the image data storage unit 302, a process for creating synthesized data from the image data, and a process for transferring the synthesized data to the display unit. Only the image data combining operation and the combined data transfer process to the display means will be described. Regarding the drawing process in the other image data storage unit 302, it is assumed that the drawing unit 303 separately performs drawing in the image data storage unit 302 in accordance with an instruction from the receiving unit 310.

  First, when the period updating unit 308 determines that a predetermined time has come, the process of the flowchart is started.

  In step S501, the periodic update unit 308 instructs the update detection unit 304 to detect the update, and the update detection unit 304 determines whether or not the image data 320 (1) to 320 (N) is updated in the image data storage unit 302. Detect and notify the period update means 308 of the detection result. In step S <b> 502, when the image data 320 (1) to 320 (N) is updated based on the received detection result (step S <b> 502 is Yes), the cycle update unit 308 instructs the synthesis unit 307 to perform synthesis processing. On the other hand, when there is no update (step S502 is No), the flowchart is ended.

  In step S503, the synthesizing unit 307 inquires the continuous update area detecting unit 306, and acquires the continuous update areas 305 (1) to 305 (N) in the image data storage unit 302 detected by the continuous update area detecting unit 306. In step S504, the period update unit 308 determines whether or not drawing is currently being performed in the drawing unit 303. If drawing is not in progress (No in step S504), the process proceeds to step S505 to continue the processing. On the other hand, when drawing is in progress (step S504: Yes), the flowchart ends. Whether or not drawing is in progress is determined based on a notification from the drawing-in-combination inhibiting unit 309.

  In step S505, the combining unit 307 is a region included in the image data 320 (1) to 320 (N) based on the continuous update regions 305 (1) to 305 (N) acquired from the continuous update region detection unit 306. The synthesis areas 330 (1) to 330 (N) are determined, and the synthesis data 340 is updated by performing a synthesis process on these.

  Finally, in step S506, the composite data transfer unit 350 transfers the composite data 340 to the display unit 301 as display data.

  Note that the processing of the above flowchart is executed at every time determined by the period update unit 308, but the drawing unit 303 may be executed when the drawing processing to the image data storage unit 302 is completed.

  According to such a configuration, even when the update of the image data 320 (1) to 320 (N) is partial, the continuous update region detection unit 306 continues the continuous update region 305 (1) at the physical address including the update region. ) To 305 (N), the synthesizing unit 307 further detects the synthesis areas 320 (1) to 320 (N) corresponding to the union, and only the synthesis areas 320 (1) to 320 (N) are detected. Since it is possible to perform the combining process, it is possible to suppress the memory transfer amount accompanying the combining operation and the processing load on the hardware for performing the combining.

  Further, according to such a configuration, since a continuous area including all the update areas can be synthesized, the data reading process from the physical memory in which each screen data is stored can be performed once during the synthesis process. Therefore, the CPU processing load can be reduced by using a DMA transfer method that does not require CPU processing.

  Furthermore, according to such a configuration, even when screen data updates frequently occur in a short time, a continuous update area on a physical address including all screen data updates performed during a predetermined time is detected. By doing so, it is possible to reduce the hardware for performing the synthesis process and the memory read load.

  Although the present embodiment has been described as an example in which both the period update unit 308 and the drawing-in-combination suppression unit 309 are mounted, they may not be mounted or may be mounted independently.

  In the present embodiment, the information detected by the continuous update region detection means 306 is the X coordinate and Y coordinate of the pixel that is the starting point (X increases in the right direction and Y in the downward direction with the upper left corner of the screen as the origin). If the coordinate value that can be detected by the continuous update area detection unit 306 is used as it is, the summation unit 307 can use the coordinate information that can be detected by the synthesis unit 307 as it is. This is more effective because the combined areas 330 (1) to 330 (N) to be a set can be detected.

  In the present embodiment, the updated area is a rectangle of 402, 422, but the continuous update area is also used in cases other than a rectangle or when the updated figure is divided into a plurality of parts on the coordinate axis. If the detection means 306 is implemented as a means for detecting a continuous area at a physical address including them, it can also be applied to non-rectangular drawing data or drawing data divided on coordinate axes, It is valid.

  In the present embodiment, as the continuous update area including the updated areas 402 and 422, the synthesis area is detected in the minimum continuous update area and the synthesis unit 307 is implemented. 422, it may be implemented as starting from any pixel that is efficient on the system and ending at any pixel or size (for example, a well-defined value or size as a physical address).

  The functional blocks such as the drawing unit 303, the update detection unit 304, the continuous update area detection unit 306, the synthesis unit 307, the image data storage unit 302, and the composite data transfer unit 350 may be realized as an LSI that is an integrated circuit. Good. In this case, it may be individually made into one chip, or may be made into one chip so as to include a part or all of it. Further, if integrated circuit technology comes out to replace LSI's as a result of the advancement of semiconductor technology or a derivative other technology, it is naturally also possible to carry out function block integration using this technology. Biotechnology can be applied.

  The display data synthesizing apparatus according to the present invention detects a continuous update area continuously in a physical address including the synthesized data even if the synthesized data is partially updated, and then only synthesizes the synthesized area corresponding to the union. Therefore, it is possible to reduce the memory transfer amount associated with the synthesis operation and the processing load on the hardware that performs the synthesis, such as devices and systems with low hardware performance such as mobile phones and PDAs. Also useful. Moreover, if it is a processing apparatus with a display, it can be used also with various household appliances, information processing apparatus, industrial equipment, and the like.

The block diagram which shows an example of a structure of the display data synthesizing | combining apparatus in embodiment of this invention. The figure which shows an example of the data which the image data storage means in embodiment of this invention hold | maintains The figure which shows an example which modeled the synthetic | combination area | region determination process in embodiment of this invention The flowchart which showed the synthetic | combination process of the display data synthetic | combination apparatus in embodiment of this invention, and the transfer process to the display means of synthetic | combination data The block diagram which shows an example of a structure in the conventional display data synthesizing | combining apparatus. The figure which shows an example which modeled the image data and the synthesis process in the conventional display data synthesis apparatus The figure which shows an example which modeled the display data in the display means of the conventional display data synthesizer

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Image layer memory 102 Display monitor 103 Image supply unit 104 Frame update flag 105 Drawing control circuit 110 (1) -110 (N) Image layer 120 Composite layer 201, 211 Image data 202-204, 212-214 Pixel 221 Composite data 222 224 synthesized pixels 301 display means 302 image data storage means 303 drawing means 304 update detection means 305 (1) to 305 (N) continuous update area 306 continuous update area detection means 307 synthesis means 308 period update means 309 composition during drawing Suppressing means 310 Receiving means 320 (1) to 320 (N) Image data 330 (1) to 330 (N) Composite area 340 Composite data 350 Composite data transfer means 401, 421 Image data 402, 422 Update Frequency 403,423 continuous update region 404,424 synthetic region 405,425 continuous synthesis area

Claims (7)

A device that transfers the display data to a display device that displays display data on a screen,
Image data storage means for storing image data for two or more image layers that can be displayed on the screen of the display device;
Drawing means for drawing image data in the image data storage means;
Update detection means for detecting an update of each image data stored in the image data storage means;
When the update detection unit detects an update for one or more image data, a continuous update region detection unit that detects each continuous update region in each image layer in which the update is detected;
The continuous update area is a continuous area in the physical address including all update areas in the image data in which the update is detected,
The composition in which the continuous update area is equivalent to an area that is a union on the coordinates of the screen of the display device, and the composition area of the two or more pieces of image data is synthesized using a continuous area in a physical address as a composition area. Means,
A display data synthesizing apparatus comprising: synthesized data transfer means for transferring the synthesized data synthesized by the synthesizing means to the display device as display data. The synthesizing unit synthesizes the continuous synthesis area of the screen data for N screens, with a continuous area in a physical address including all the one or more synthesis areas in each image data as a continuous synthesis area. The display data synthesizing device according to claim 1. The update detection unit is instructed to detect the update of each image data stored in the image data storage unit every predetermined time, and when there is an update, the composite data obtained by instructing the combination unit is obtained. 2. The display data synthesizing apparatus according to claim 1, further comprising period synthesis means for instructing the synthesis data transfer means to transfer. 2. The composition-in-drawing-inhibiting unit for prohibiting the compositing process in the composing unit when the image-drawing unit is drawing in any image data included in the image data storage unit. The display data synthesizing device described in 1. The continuous update region detection means is determined for each image data from one or more pixel sets drawn by the drawing means between the time when the combined data transfer means last transferred the combined data and the present time. Means for detecting a continuous region in a physical address including a start pixel and an end pixel,
The start pixel has the smallest X coordinate among the pixels included in the image data in the pixel set and having the smallest Y coordinate of the coordinate information indicating the position displayed on the screen of the display device. Pixel,
The end pixel is a predetermined pixel that starts from a physical address of the start pixel in the image data storage means and is stored at a physical address that includes all pixels included in image data in the pixel set. The display data synthesizing device according to claim 1. The continuous update region detecting means includes a sum of a pixel set having a Y coordinate smaller than the start pixel and a pixel set having an X coordinate equal to or less than the X coordinate of the start pixel among pixels having the same Y coordinate as the start pixel. 6. The display data synthesizing apparatus according to claim 5, wherein the continuous update area is detected based on coordinate information of a predetermined pixel included in the set and coordinate information of the end pixel. The continuous update region detecting means includes a sum of a pixel set having a Y coordinate smaller than the start pixel and a pixel set having an X coordinate equal to or less than the X coordinate of the start pixel among pixels having the same Y coordinate as the start pixel. Detecting the continuous update region on the basis of an arbitrary width and height including coordinate information of a predetermined pixel included in the set and coordinate information of the end pixel counted from the coordinate information of the predetermined pixel. 6. The display data synthesizing device according to claim 5, wherein

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