TWI313563B - A display mixer and the method thereof - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen display mixing system and method, and more particularly to a screen display mixing system and method for mixing multi-layer data such as a video layer and a graphics layer. [Prior Art] Digital video broadcasting (Digital Vide〇Br〇adcasting; dvb) is a digital service architecture for the market. In the DVB standard, the motion picture compression standard (Moving Picture Expem Gr〇up_2; MPEG-2) is selected as the audio information. And the encoding compression method of video. The compressed MPEG-2 bit stream packet forms a traverse stream gamma (10) price deletion; TS) 'Multiple conversion of multiple transmission streams, which can be performed by different media such as satellite, cable TV and wireless TV Passing the wheel. ...the MPEG2 bit stream is decoded into (4) sent to the TV signal encoder. Before the code display is displayed, it is usually necessary to display the operation interface with the screen.

Screen Display; OSD), Polyester North Review _; cursor, background, graphical user interface (GUI), subtitles, etc. are pre-mixed to form a picture - and then send the TV signal encoder according to the field scan rate Display. The hierarchical model is defined in the face standard (me job _

Mode", which shows the different data layers by display hierarchy. The (10) is a schematic diagram of the hierarchical mode in which the plane is displayed in the technique *. Referring to Fig. i, the display hierarchy generally includes a background layer η, a video layer 12, a layer i3, a 〇sdm layer, a subtitle layer 15, a vernier layer 16, and the like. The background layer u is often referred to as a monochrome background. The video layer u is usually a video stream generated by the video decoder and can be coupled to the hybrid system via the hardware 1313563. The GUI layer 13 often includes windows, function tables, and the like. The subtitle layer 15 refers to related information decoded from a Packetized Elementary Stream (PES) in a transport stream, such as subtitles, palette contents, and the like. OSD (On Screen Display) is usually used for hardware settings, adjustment of information display, etc. The cursor layer 16 is a hardware cursor, controls the position of the cursor, and the like. Generally, the background layer, the GUI layer, the OSD layer, the subtitle layer, the cursor layer, and the like are all pixel formats of the RGB domain, and the video layer is a pixel format of the YUV domain, such as the YUV 4:2:2 format, so the mixing process The background layer, GUI layer, OSD layer, subtitle layer, and cursor layer need to be converted from RGB to YUV format first. The main function of the hybrid system is to convert and mix the RGB to YUV format of the hierarchical mode, and finally output a mixed picture to the TV encoder. The prior art generally converts the RGB format to the YUV format for each layer of the GUI layer, the OSD layer, and the subtitle layer, and respectively mixes them with the video layer. For example, the GUI layer is first converted from RGB format to YUV format, and mixed with the video layer into a second layer; then the OSD layer is converted from RGB format to YUV format, and then mixed with the second layer obtained by mixing the front layer. And the third layer is obtained; the background layer is converted from RGB format to YUV format, and then mixed with the third layer obtained by the previous mixing to obtain the fourth layer; ...; finally, the cursor format is RGB format to YUV format. The conversion is then mixed with the previously mixed layer to obtain the final layer. The operation of converting the RGB format to the YUV format is performed, and after multiple mixing, the final mixed image can be output to the television signal encoding system. In the prior art, for each layer of RGB to YUV format conversion, such a conversion mode 1313563 group is provided, but the RGB to YUV format conversion module consumes a relatively large hardware area, which inevitably results in the hardware area of the entire system cannot be reduced. Accordingly, the cost cannot be reduced. SUMMARY OF THE INVENTION It is an object of the present invention to overcome the deficiencies of the prior art and to provide an improved screen display mixing system that reduces the hardware area of the system and reduces the overall cost of the system.

One aspect of the present invention provides a screen display mixing system including: a screen coordinate scanning device that scans a screen to generate a current scanning pixel in the form of a coordinate scanning stream; a first rectangular window device that determines a current scanning based on the coordinate scanning stream The pixel is located in one of the plurality of windows including the graphic window and the cursor window, and selectively selects a data layer including the graphic layer and the cursor layer to form a temporary layer of the RGB domain; and the first rectangular window The device determines, according to the coordinate scanning stream, that the current scanning pixel is located in a video window; and the buffering device receives the transmitted graphic layer material and the second moment from the first rectangular window device according to the window in which the current scanning pixel is located. The guard window device receives the transmitted video layer data; y

The conversion device converts the temporary layer data field of the RGB domain to the YUV domain; 仃 RGB pin ha mixing device 1 temporary UV layer of the YUV domain for alpha blending. In another aspect of the present invention, a method for displaying a screen is provided. The 1313563 includes the following steps: 1. The display area of each layer of data that should be displayed on the screen is in the first rectangular view. a graphics window corresponding to the graphics layer data and a cursor window corresponding to the cursor layer I, a video window corresponding to the video layer = in the second rectangular window device and defining a window position coordinate for each window; Silk 'and the obtained current scan material is sent to the first rectangular window device and the second rectangular window device in the open/form of the coordinate scanning stream; the current scanning pixel is compared with the window position coordinates of the respective windows to determine The window in which the current scanning pixel is located; according to the window in which the current scanning pixel is located, the data of each layer is sent to the 4 buffer device, wherein the graphic layer data and the cursor layer data are selected one by one before being sent to the reading buffer device. Forming a temporary layer; 判断 When judging that the data of the reading buffer device is temporary layer data, performing rGB format on the temporary layer data to γυν Conversion formula; layers of video and data information via the temporary layer after the format conversion carried out in the YUV color domain Alpha blending. [Embodiment] ^In MpEG-2 decoding 'Generally, the Gm layer, the sputum layer, and the subtitle layer are all stored in a random dynamic random access memory (SDRAM) in a scattered form. In order to simplify the hierarchical mode in the DVB standard, scattered content such as layer, layer and subtitle layer can be pre-mixed before being sent to the screen display mixing system (hereinafter referred to as the hybrid system) to form a full-screen graphics layer and stored in the SDRAM. +. In an embodiment of the present invention, 9 1313563 can pre-amble the scattered content in the SDRAM such as the GUI layer, the OSD layer, and the subtitle layer through the 2D module engine to form a full-screen graphics layer. In a preferred embodiment, the graphics layer can be allowed to support a number of small bit-wide pixel formats, thereby reducing the bandwidth requirements to some extent. After pre-mixing, the original hybrid model is simplified into 4 layers. As shown in Figure 2, the background layer u, the graphics layer 17, the video layer 12 and the vernier layer 16, respectively, thus providing the first to simplify the design of the hybrid system. A simplified model.

The figure is a schematic diagram of the system engine structure of the hybrid system of one embodiment of the present invention. The system engine includes a screen coordinate scanning device 31, a first rectangular window device 33, a second rectangular window device 34, a read buffer device 35, a conversion break 36, and an ALPHA spread device 37. The screen coordinate scanning device scans the entire screen and emits a coordinate scanning stream to the first rectangular window device 33 and the second rectangular window device 34. The first rectangular window means 33 and the second rectangle 34 use the window mechanism ' to judge the current scan based on the coordinate scan stream: which window is located. The read buffer device 35 is loaded according to the first rectangular window. No. =: moment t: The judgment result of the window device 34 is read. At that time, the screen is provided with 36 pairs: 7 The data sent by the device is defined as a temporary layer. The conversion table 36 performs an alpha blending operation on the temporary layer data by rgb to the ALPHA hybrid device. #Video Pixels and Temporary Layer Pixels Figure 4 shows the screen coordinate scanning device. The screen can usually be defined as an H-shaped schematic. The entire upper corner defines the horse as shown in Figure 4, and the left is light. The origin (〇, 〇)' is the positive axis of the X-axis to the right and the 1313563 of the y-axis downward. The "window" in the window mechanism refers to the area in which such a screen sits. In one embodiment of the present invention V, the field of the morning surface, it may be specified by the position coordinates of the upper left corner and the lower right second:: For example, the display area "2 corresponding to the video layer" is determined by only two position coordinates (Xvl, Yvl) and (χν2, γν2): two =: display area, the background window can be two position coordinates (Xbl'Ybl) And (Xb2, Yb2) to determine and so on.

: Preface, "The top left corner of a glory screen began to scan until the curtains 2, ,,. bundle. Odd lines are scanned while the broom field is counted, and even lines are scanned for the even broom map %. The screen coordinate scanning device stably emits a coordinate scanning stream based on the scanning timing of the video scanning. A horizontal counter and a vertical counter (not shown) are provided in the screen scanning device. The horizontal counter counts the screen horizontally and the vertical counter counts the screen vertically. Here, a screen scan area of 64 〇 * 48 为 is taken as an example for explanation. When the hybrid system counts in frame mode (Frame M〇de), the horizontal counter counts from 〇 to 639 each time it is accumulated and is vertical. Tens are incremented from 0 to 479 each time. When the hybrid system uses the Field Mode to count, the entire screen is divided into odd and even fields. First, the odd scan field is counted, and the even scan field is counted. When counting an odd scan field, the count of the horizontal-decimal device is incremented from 〇 to 639, the vertical count is from 〇 to Μ 8 female-under-accumulated 2; when the even-numbered sweeping cat field is counted, the counter of the horizontal counter 攸Each time 0 to 639 is incremented by 1, the vertical count is incremented by 2 from 1 to 479. Figure 5 is a block diagram showing the structure of a hybrid system in accordance with one embodiment of the present invention. The control register 4 receives the command signal from the cpu (not shown) and controls the operation of the system. The operational state machine of the control register 40 can be seen in Fig. 6, including four states: a start state 61, an intervening state 63, an operational state 65, and an error processing state 67. When the hybrid system starts working, the control register is first written by the CPU, and the start register (not shown) is assigned a value of 1, and the hybrid system enters the idle state from the start state 61. In the case of the 63, the hybrid system detects the sync signal vSync, reloads the shadow register (not shown), and enters the working state. 65' The system engine starts the mixing operation. When the hybrid system has finished loading the data of the frame at that time, it receives the signal that DMA_finish is i, and enters the error state t 67. In this state, all input data will be put in the first in first out = method (Fim In, First _ ; Yangshuo) Do a clearing operation to prevent the data remaining on the top-frame due to errors, thus isolating the influence of each frame from each other' to achieve the purpose of reconnaissance errors. The error handling state 67 automatically returns to the idle state 63 after 5 cycles. Referring to FIG. 5 and FIG. 6 simultaneously, one of the first rectangular window devices 33 according to the present invention can perform multiple-selection selection on the background layer, the (10) layer, the (10) two-screen:, the cursor layer, and the like. According to the foregoing description, in the embodiment of the present invention, the scattered content such as the layer, the SD layer and the subtitle layer can be pre-mixed in the heart system to form a coexistence. Back to the graphics layer of the wall in the SDRAM, 鸠中. Therefore, the first rectangular viewing pair of the background layer, the graphic layer and the vernier layer are three-selected: the second connecting window device 33 and the second moment are: the first-rectangular 1 4 knife is equipped with a visual (four) breaking device 70 for each of the layers ( As shown in Fig. 7, in this embodiment, the sister #换J 5 tongue § brother 'is configurable to the graphics layer - a graphics layer window „ 12 1313563, for the vernier layer can be configured with a vernier layer window judging device. Before, a display window corresponding to each layer of data of the graphic layer and the cursor layer is respectively provided with a window, which can be respectively referred to as a graphic window 331 and a cursor window 332. Each of the windows includes the above-mentioned window determining device. As shown in FIG. 2, the graphic The window is determined by two position coordinates (Xgl, Ygl) and (Xg2, Yg2); the cursor window is determined by two position coordinates (Xcl, Ycl) and (Xc2, Yc2). The position coordinates of the graphics window and the cursor window are The window judging device is input at the beginning of each frame image. Fig. 7 is a schematic view showing the structure of the window judging device. In Fig. 7, each of the window judging devices is provided with a window position coordinate register 7〇1 and a window comparing device 702. The window position coordinate register 7〇1 can store the position coordinates of the definition window, such as the two position coordinates of the graphic window 331 (Xgl, Ygl) and (Xg2, Yg2). The two position coordinates of the cursor window 332 (Xcl, Ycl) And (Xc2, Yc2). Please refer to both Fig. 5 and Fig. 7. In Fig. 5, the second rectangular window device 33 can judge the video layer data, similar to the principle of the first rectangular window device 34, wherein The video window 341 includes a video layer window judging device 7 (as shown in Fig. 7.) The video window 341 can be determined by two position coordinates (Χν1, Υν1) and (Xv2, Yv2), and as shown in Fig. 7. The video layer window determining device 70 is also provided with a window position seat (χν2, γν2), which is input to the window position coordinate register 701 of the window determining device at the beginning of each frame image. The coordinate scanning stream sent by the glory coordinate scanning device 31 Parallelly through the video layer window judging device, the graphic layer window judging device, and the cursor layer window, the 13 1313563 breaking device is determined. Each of the window judging devices in the + ^ ^ ^ 7 is compared to the coordinate scanning & and each window Location seat For example, the video layer visual function judging device compares the coordinate scanning stream with the position coordinates (ΧνΙ, ΥνΙ) and (Xv2, yv2) (1) of the window of the horizon, and judges the scanning pixels at that time. No is located in the video window. If you want to scan the pixel (X, Y) at that time, meet the drop condition, fall into two of you - the upper two coordinates (Xvl, Yvl) and (Χν2, Υν2) Between

Xvl < X ^ χν2 ;

Υνί ^ γ < γν2 Then the scanned pixels fall into the window.

Please also refer to Figure 5 and 箆8m wall L. The second rectangular window device 34 is provided with a video FIF0342 for receiving video data from the video decommissioner. When the video layer window determining means determines that the scanning pixel falls within the video window 341, the video layer window determining means generates the video window valid signal xy_in a video and sends the signal to the read buffering means 35. Accordingly, the read buffer device 35 loads the video pixels from the video FIF 0342.

The first rectangular window device 33 is provided with a graphic FIF 334 and a graphic DMA (Direct Memory Access) 333. Graphics The DMA333 can transfer graphics data from external memory and store it in the graphic FIF0334. The external memory can be SDRAM or the like. When the graphics layer IA judging means judges that the scanning pixel falls within the graphics window 3 31, the graphics layer window determining means generates the graphics window valid signal xy_in a graphic and sends the signal to the read buffering means 35. Accordingly, the read buffer device 35 loads the graphics pixels from the graphic FIF0334. The cursor data and background data are built into the system engine of the hybrid system. 14 1313563 In an embodiment of the present invention, the read buffer device 35 includes a small-capacity Zhao and a background data for the data to be marked, and the data and background information are stored in the left side of the money. The back of the scratchpad = Γ can be adjusted to change the color of the background. When the cursor layer: the layer scan pixel falls into the cursor window at the time, the cursor number, ,, 2 generates the cursor window valid signal xyJn-curs0r, and the k ring reaches the reading scale to the station. 儿竹擎 internal model Jr The read buffer device 35 loads the cursor data from the system inner wheel, and loads the cursor data. For example, the read buffer device 35 loads the background data from the internal module of the system engine from the wire to the gums. In the system definition of one embodiment of the present invention, the primary fills in the background when the data is not published. The background layer 9 does not have a tooth chamber, and the layer is not equipped with a special window to determine the position. σ is in the form of a helmet, a cursor and a video window, and a 录德杏兹X North θ,,,, At present, Shi Tiansu falls into the #厅, window, and selects the background layer input. In other embodiments of the present invention, the first-rectangular window device can select one of the graphic layer and the vernier layer into the pole-and-go layer. Background Processing in a window device. When the second rectangular window is installed, the video layer window in the device is "the front coordinate scanning pixel does not fall in the video layer window, and it is considered that the pixel "background window" is selected at the time. The background layer is rounded. Figure 8 is the internal structure of the read buffer device and the surrounding intersection = map. The read buffer device 35 has a load-input temporary storage 351 and a turn-out register 353, and the sub-set protocol parsing device 355 coordinates the reading and transmission of the input register and the feed. The input register 351 can temporarily store the signals received from the front device of the rectangle and the device of the second rectangular window 34, such as the §fi window effective signal χ丨 id • y — V ae 〇 the cursor window is valid Signal xyjn-cu legs, etc. For the graphic FIF 〇 334 and the video yang 342, when the data that needs to be output is already placed in the FIFO on the 15 1313563 FIFO, waiting for the lower module to read, the graphic waiting signal G_fifo_lasting of the graphic FIF0334 is high. Or the video waiting signal V-fifo_lasting of the video FIF0342 is high. If the protocol parsing means 335 receives both the graphics window valid signal xy_in_graphic and the valid graphics wait signal G_fifo_lasting, a pattern readable signal G_fifo_reading corresponding to the graphics FIFO is issued, and the data on the graphics FIFO is taken. If the protocol parser 335 receives the video window valid signal xy_in_video and the video wait signal V_fifo_lasting simultaneously, a graphic readable signal V_fifo_reading corresponding to the graphics FIFO is issued, and the data on the video FIFO is taken. The read buffer unit 35 is simultaneously connected to the conversion unit 36 and the ALPHA mixing unit 37. The conversion device 36 can convert the data in the RGB format to the YUV format. In an embodiment of the present invention, when the data in the read buffer device is a temporary layer, that is, a background layer, a graphics layer, and a cursor layer, the data is first sent to the conversion device 36, converted from the RGB format to the YUV format, and then sent. Into the ALPHA mixing device 37. When the data in the buffer unit 35 is the video layer, the data is sent directly to the ALPHA mixing unit 37. The ALPHA mixing device 37 performs an ALPHA mixing operation on the video pixels and the temporary layer pixels on the current coordinates. It can usually be calculated by the following formula: dst = A * src 1 + ( 1 - A) * src2 = A * ( src 1 - src2) + src2 In the formula, src 1 and src2 represent the layers participating in the mixing, respectively, assuming src 1 is Above src2, where A is the ALPHA value, indicating "opacity", 16 1313563 = value range is Hi value is 0, it means completely transparent; when taken, it means completely opaque. For the ALPHA hybrid π ά 1 1,, - & * icon), used to adjust hLPHA: for the picture band ... J such as 'for a pixel point ' srcl 》 ” v layer 'sire 4 video layer ' When the video layer data is on the graphics layer = ρηα value adjusting device sets the ALPHA value to q, the video layer completely covers the graphics layer after the pixel point δ. ...the ninth figure is a camping display hybrid diagram according to an embodiment of the present invention. According to the ninth figure, the hybrid method of the present invention includes the following steps: a red step 90" setting a plurality of windows and positioning each window Two more windows, including video window, graphic window and cursor window. , ν9G2. Scan the screen and send the coordinate scan to the first and the shape: window device. In this embodiment, the screen coordinates are scanned; and the scanned pixels are scanned into a shape of a coordinate = rectangular window device and a second rectangular window device. - The scanning pixels at the time of the step are compared with the window position coordinates of the windows in the above-mentioned first-rectangular window device port:: window device to confirm the window: the window in which it is located. In this embodiment, the first-rectangular view-! and the second-divided window device respectively form a layer of the window, the first-rectangular window, and the second:::::: Temporary layer, second rectangular window description = scan pixel is compared with the video window to determine whether the pixel is currently located in the video window. Step 904. According to the window where the pixel is scanned at the time, the transmission is completed to read 17 1313563. In this embodiment, if the current scanning pixel is in the graphics window, the rectangular window device transmits the graphic data from the image opening "IF0" to the reading buffer, and if the scanning pixel is in the video window, the second rectangular window device transmits the image in the fIF0. Expected to read the buffer device; if the current j cursor window is scanned, the cursor data is read directly from the system engine to the read position. If the current scan pixel does not fall within the defined coordinate window, the background data is read in the system engine. Go to the reading buffer. Step 905 ·• Determine whether the data in the read buffer device is a temporary layer. When it is judged that the data in the read buffer device is a temporary layer, that is, =, graphic or cursor data, step 9()6;;, however, when it is judged that the data in the read buffer device is not a temporary layer, Steps will be performed, that is, when the data is judged to be the video layer, the data is directly sent to the ALpHA mixing device. Step 9G6: The data is sent to the conversion device, so that the data is first converted from the GB format to the γυν format, and then sent to the ALpHA mixing device. . v. 907 · ALPHA mixing. In the present embodiment, the temporary layer data of the γυν domain is mixed with the video layer data for ALCHA. In the above, before being stacked in the hybrid system, the graphics layer may be pre-mixed by the scattered content such as the Gui layer, the layer and the subtitle layer to form a graphic layer of the full screen, and stored in the SDRAm. In addition, in step 902, the screen coordinate scanning device stably emits the coordinate scanning stream according to the video::even sweeping field timing, and the coordinate stream scanning is processed in parallel through each rectangular window to determine the scanning pixel at that time. Which window is located. In step 9〇4, the background data of the system engine= is first set by the software in the RGB format, and then from the system engine to the read buffer device. Step 9〇6, background layer, graphics layer and swim 18 1313563 The layer layer shares a RGB color field to the γυν color field conversion device on the hardware path. • FIG. 1 is a flow chart of a screen display mixing method according to another embodiment of the present invention, which is different from the embodiment shown in FIG. 9 in that the background layer is not used as a temporary layer but directly in the system engine by the software. Set to format, you don't need RGB to YUV conversion, you can read the read buffer from the system engine and directly participate in the AlpHA mixing operation. According to Fig. 10, in step 9〇3 of the mixing method of the embodiment, the first rectangular window device selects only one of the graphics, the cursor and the like to form a temporary layer. In another aspect of the embodiment, the foregoing OSD layer, GUI layer and subtitle layer may also be directly sent to the screen display mixing system for processing without premixing, in which case the graphic window will be Includes windows such as SD " windows, GUI windows, and caption windows. As described in the uranium, in one embodiment of the present invention, the zero-lust content in the SDRAMs such as the GUI layer, the OSD layer, and the subtitle layer may be alpha-mixed in advance by the 2d modular system engine to form a full-screen graphics layer. The following is an embodiment of the present invention for performing the mixing described by a 2D module to form a pattern layer. Of course, the premixing can also be accomplished using modules of other conventional forms. Fig. 11 is a block diagram showing the hardware structure of a 2D module according to an embodiment of the present invention. The 2D module uses the data DMA 111 to retrieve data from the SDRAM and send the data to the source buffer. In the figure, the 2D module sets the first source buffer 113 and the second source buffer 114, so that when the data DMA 111 takes data from the SDRAM, it can take two layers of data into the first source buffer at a time.

113 and a second source buffer 1丨4. The data in the first source buffer 113 and the second source buffer U4 are then entered into the 2Da 丨pha mixing unit 116 for pre-mixing. In an embodiment of the present invention, a format conversion early το 120 may be set between the first source buffer 丨丨3 and the second source buffer 114 and the 2Dalpha mixing unit to support data layers of various pixel formats. This allows the graphics layer to support multiple pixel formats with small memory bit widths, thereby reducing the bandwidth requirements to a certain extent. According to an embodiment of the present invention, as shown in FIG. 5, the format conversion unit 12 includes format converters 121 and 123, which can convert various formats such as RGB565, ARGB3454, ARGB4444, ARGB32, etc. into a unified format. For example, the ARGB32 pixel format. The sample-like 2Dalpha mixing unit can be pre-mixed in a format such as ARGB32. In the embodiment shown in FIG. 11, the palette 122 and the pattern conversion H 121 are disposed in parallel between the __source buffer and the 2Dalpha buffer, and similarly, the palette 122 can be buffered at the first source. And the second source buffer 114, the 2Daipha mixing unit U6 performs some format type pixel format conversion, for example, converting an 8-bit ARGB32 index, an 8-bit AYUV32 index, etc. into an ARGB32 format. It can be understood that the format conversion unit with the 2Dalpha mixing unit can configure other devices to perform conversion of various pixel formats in addition to the format converters 12 and 123 of the present embodiment. The 2Dalpha blending unit performs an ALPHA blending operation on the format converted pixels in the first source buffer and the second source buffer. It can usually be calculated by the following formula:

Dst = A * = A srcl + (1-A) * src2 (srcl - src2 ) + src2 20 1313563 In the formula, src 1 and src2 respectively represent the layers participating in the mixing, here the first source buffer and the second source buffer The formatted pixel layer in the device. Suppose that src 1 is above src2, where A is an alpha value, indicating "opacity", which ranges from 0 to 1. When the value is 0, it means completely transparent. When the value is 1, it means completely opaque. The 2Dalpha blending unit can contain 2D alpha value adjustment logic to adjust the ALPHA value. For example, for a pixel, src 1 is the GUI layer and src2 is the OSD layer. When the OSD layer data is above the GUI layer, the 2Dalpha value adjustment logic sets the ALPHA value to 0, and the pixel is completely covered by the mixed OSD layer. GUI layer. The 2Dalpha mixing unit sends the mixed data to the 2D output FIF0117. The 2D output FIF0117 is connected to the 2D return FIF0112, and the data in the 2D return FIFO is sent back to the SDRAM via the data DMA. When multi-layer mixing is required by using 2D modules, for example, a mixture of three or more layers, the data of the 2D output FIFO can be sent to the SDRAM through the 2D return FIFO 112, and then sent back to the 2D module by the data DMA. The other layers in the SDRAM are mixed so that the multi-layer mixing can be achieved by reusing the 2D module that supports the two-layer ALPHA mixing. The 2D module system engine is controlled by the 2D configuration register 200. The 2D configuration register 200 receives control commands from the CPU and implements control of the 2D module system engine by interrupting the communication mechanism. The working state machine of the 2D configuration register 200 is as shown in FIG. It includes four states: Start 21, Idle 23, Work 25, and Interrupt Service Program 27 Status. In the start state 21, the CPU issues a start command to the 2D configuration register 200 and configures all other 2D registers. Subsequently, the 2D module system engine enters idle 21 1313563 state 23. In the idle state, if the configuration register fan receives the signal that the engine-start register is set to i, the 2D configuration temporarily stores the crying 2〇〇 and will enter the working state to start the 2D module system engine to start working. ^ Module system engine in the state of the state 25, if it receives the interrupt command issued by the cpu, it will enter the interrupt service program (ISR) state 27 to wait. Under the interrupt service program (ISR), the 2D configuration register is connected to the =rne-.stan register, and then returns to the working state, and continues to work. 'If the engine-coffee register is received, it is 0. The signal returns to the idle state 23. Although the present invention has been disclosed above in the preferred embodiment, it is not intended to limit the invention, and any person skilled in the art can make various changes and _ without departing from the scope of the present invention. The scope of protection of the present invention is defined by the scope of the patent application. ', [Simple description of the map]

The accompanying description of the examples, in conjunction with the '''''''''' The same reference numerals are used in the drawings to illustrate the features of the embodiments of the present invention, but the corresponding elements, components or steps of the present invention are not limited thereto, wherein the first figure shows DVB In the technique, the schematic diagram of the hierarchical mode of the three-sided hierarchical mode is shown as a schematic diagram showing a mode of the present invention. A simplified hierarchical diagram showing a mixed system in an example. Fig. 3 is a schematic diagram showing the structure of a screen display engine according to an embodiment of the present invention. ’ 22 1313563 Work = The picture shows the 111th schematic of the (4) curtain coordinate sweeping device in the 3rd line. Figure 5 is a block diagram showing the structure of a display screen hybrid system of an embodiment of the present invention. Figure 6 is a schematic diagram showing the operating state of the hybrid system on the screen shown by 帛5 ffi. Fig. 7 is a view showing the structure of a window judging device in the screen display mixing system of the present invention.

Figure 8 is a schematic diagram showing the internal structure and peripheral interaction signals of a read buffer device in the screen display hybrid system of the present invention. Figure 9 is a flow chart showing an embodiment of the screen display mixing method of the present invention.

Figure 10 is a flow chart showing another embodiment of the screen display mixing method of the present invention. Fig. 11 is a block diagram showing the hardware structure of the 2D module of the embodiment of the present invention. Figure 1 2 is a schematic diagram of the 2D module working state machine shown in Figure 11. [Main component symbol description] 11: Background layer 111 Data DMA 12: Video layer 112 2D return FIFO 13: GUI layer 113 First source buffer 14: OSD layer 114 Second source buffer 15: Subtitle layer 116 2Dalpha mixing unit: Cursor layer 117 23 2D output FIFO 1313563 17 : graphics layer 120. format conversion unit 200: 2D configuration register 121, 123: format converter 21: start state 122. palette 23: idle state 331: graphics window 25: Working state 332: Cursor window 27: Interrupt service program state 333: Graphics DMA 31: Curtain coordinate scanning device 334: Graphics FIFO 33: First rectangular window device 341: Video window 34: Second rectangular window device 342: Video FIFO 35 : read buffer device 351 : input register 36 : conversion device 353 : output register 37 : ALPHA hybrid device 355 : protocol analysis device 40 : control register 701 : window position coordinate register 61 : start state 702 : Window comparison device 63: Idle state 9 (H, 902, 903, 904, 905, 906, 65: Operating states 907, 903,: Step 67: Error handling State (Xbl, Ybl) and (Xb2, Yb2) 70 : window judging device (Xcl, Ycl) and (xc2, Yc2) (Xgl, Ygl) and (Xg2, Yg2) (ΧνΙ, ΥνΙ) and (Xv2, Yv2) : Position coordinates 24

Claims (1)

1313563 Private Day Correction Replacement Page Cold Rolling 45»利Special 1. A screen display mixing system, including: • A screen coordinate scanning device that scans the screen to produce scanning pixels that are formed as a standard scanning stream a first rectangular window device, determining a window in which the scanning pixel is located according to the coordinate scanning stream, and forming a temporary layer of an RGB domain, wherein the visual function is a plurality of windows including a graphic layer window and a cursor window One of the plurality, and the temporary layer is one of a plurality of materials including a background layer, a graphics layer, and a vernier layer; the first rectangular window device determines that the scanning pixel is located in a video according to the coordinate scanning stream a first reading buffer device, respectively receiving the judgment node I of the first rectangular window device and the second rectangular window device, (4) taking the window where the scanning pixel is located; and a converting device, performing the temporary layer data of the RGB domain Format conversion from rgb domain to YUV domain; and an alpha blending device for temporary layer data and a view of a Yuv domain Alpha layer data were mixed. 2. The screen display hybrid system as described in the patent application scope, wherein the graphic layer is displayed in a form of a user interface layer and a subtitle of a graphical user interface layer stored in a random state in a random state. After the layer is pre-alpha blended, it is stored again in the synchronous dynamic random access memory (0 25 1313563). If the patent application scope " the staff described the camp display hybrid system,", the graphics layer supports small The pixel format of the bit width. The image display hybrid system, the layer of the image, the layer of the image, and the layer of the cursor share a conversion device on a hardware path, the conversion is performed. The device performs the format conversion from the rgb domain to the Yuv domain. 5. The screen display hybrid system described in the scope of the patent application, the 帛-rectangular window skirt is further provided with a graphic first-in first-out unit and a memory access. The graphic direct memory access is taken from the external memory %-graphic data' and stored in the _-shaped first-in first-out unit. 6. As shown in the patent scope 帛! (4) display hybrid system, the window is judged: Don't set One of the window determining means, the view, the 2 window position coordinate register and the - window comparison loading window position coordinate temporary storage 11 storing the position coordinates of the window, in the 'comparison device: the coordinate scanning stream and the window The position coordinate is compared with X to determine whether the suppression pixel falls within an input window to determine the farming position. 7. - A screen display mixing method, which includes the following steps. Setting a plurality of windows and defining a window position coordinate for each window , in the display area corresponding to each layer of data displayed on the screen, the first rectangular window device is provided with a graphic window corresponding to a graphic layer data and a cursor window corresponding to the cursor layer data of 26 1313563, and in the __ second The rectangular window device sets a video window corresponding to a video layer data; sighs, and displays the scanned pixels in the form of a coordinate scanning stream 4 to the first rectangular window device and the second rectangular window device; Comparing the scan pixel with the window position coordinate of each window to determine a window in which the scan pixel is located; according to the window in which the scan pixel is located, Each layer of data is sent to a read buffer device, wherein the graphic layer data and (4) the layer data are first selected before being sent to the read buffer device to form a temporary layer; when determining the read buffer device When the data is a temporary layer of data, the temporary layer data is converted into an RGB format to a γυν format; the video layer data and the temporary layer data that has been format converted are alpha-blended in the YUV color field. The camp display mixing method according to Item 7 of the patent scope, wherein 'when the scanning pixel is located in the graphic view f, the first rectangular window device transmits the graphic data from the graphic unit to the read buffer device: The scanning pixel is in the video view f, the third (four) window device 'missing the video first-in first-out order (the middle-passing video information to the read buffer device) ^ when the scanning pixel is in the cursor, t is connected to the read cursor The data is read to the reading buffer, and the other is to read the background data to the reading buffer device. 9: Applying the screen display mixing method described in item 7 of the patent, wherein the 1-screen coordinate scanning device stably emits coordinate scans according to the odd and even scans of the video 27 1313563 η sequence, and the ^r- 4» 4 ^, the flat tractor's coordinate scanning stream is processed in parallel through each window device, so that the main age mountain is η 士垣1 to break out the window in which the known pixel is located. 10. The camping display mixing method as described in claim 7 wherein the data of the layer is first set by the software to the Rgb format and then read to the read buffer device. I. 11. The screen display mixing method of claim 7, wherein the 'background layer, the graphics layer and the vernier layer share a conversion device from the RGB domain to the YUV domain. I2. The screen display mixing method described in item 7 of the patent application scope is as follows: 'the background layer is directly set to the YUV format by the software, and is not part of the ej temple layer, because the reading buffer device is read. After that, directly participate in ALPHA > Kunhe operation. I3. The screen display mixing party according to item 7 of the patent application scope, wherein the graphic layer is composed of a graphic user interface layer, a screen display operation interface layer and a subtitle layer. 28 1313563 VII. Designation of Representative Representatives (1) The representative representative of the case is (2), the case is escorted to the younger brother (3) Figure 31: Screen coordinate scanning device ^ 儿间早明· 33: First rectangle Window device 34: second rectangular window device 3 5 : read buffer device field clothing set 36: conversion device 37: ALPHA hybrid device 8. The chemical formula of the case if there is a chemical formula in this case ·· May not reveal the most