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With BD-J positioned as the advanced programming method for Blu-ray, it can, of course, at minimum mimic the menu functionality of HDMV Full-screen and popup menus, as described in the HDMV part of this chapter, can also be achieved using BD-J However, the way these menus are implemented in BD-J differs very much, and provides additional capabilities First of all, the way that graphics are used is very different BD-J menus do not follow the page model that HDMV uses Instead, BD-J provides a minimum graphics buffer of 455MB for Profile 1 or 615MB for Profile 2 players, as noted in Table 617 All graphical elements to be used by the BD-J menus are decoded into the image and audio buffer3 This means that a decoded image can be used multiple times without taking up additional space This model benefits more advanced animations Graphical elements can be moved across the screen as much as the author would like them to, and the animations can even be dynamically created by the Java code, without impacting the graphics buffer
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3Smart applications can also manage the loading and unloading of images as needed to deal with the buffer restrictions, if necessary
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Blu-ray supports three image formats JPEG, PNG, and GIF The JPEG format is commonly used for a variety of Internet applications as the files are small in size However, the disadvantage of the JPEG format is that it does not support transparencies When multiple graphical objects are overlapping and must be composited together before being displayed, transparency information is necessary For such a case, the Portable Network Graphics (PNG) format is typically used as it supports alpha blending The third graphics format supported by Blu-ray is GIF but, in reality it is not used very often as it only supports one transparency color As a result, JPEG and PNG are most commonly used in real-life Blu-ray applications, with the former best used for background and opaque images with no mattes, and the latter used for matted or transparent graphics
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For compositing images, there are different graphics drawing methods available for BD-J Depending on the application scenario, an image can be drawn to the screen in different ways First, there is source mode (SRC), which takes an image the way it is and renders it to the screen, which is also called direct draw This mode does not take other graphical images into account which may be overlapped Instead, source mode simply renders the image that is on top without blending any overlapped graphical areas If the image is semi-transparent it will render as such and allow the background video plane to be seen through the image But, other rendered graphic elements on the graphics plane will not be blended Figure 616 is an example of source mode, where the rectangle cannot be seen through the ellipse Figure 616 Graphics Drawing in Source Mode
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The second graphics-drawing mode is called source-over mode (SRC_OVER) This mode takes transparency values into account when compositing overlapped graphical areas This method is typically used for graphics animations, and takes multiple overlaid images and blends them together Where graphics are semi-transparent, this mode shows the background video through the transparent areas of the rendered images Figure 617 is an example of the source-over (SRC_OVER) drawing mode, where both the rectangle and the background video can be seen through the ellipse Figure 617 Graphics Drawing in Source-over Mode
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The reason for having both modes is to allow for different creative scenarios However, there is a slight performance hit when using the source-over mode Since the images have to be composited together, additional processing power is required inside the player As a result, the source-over drawing speed is slower than using source mode and this should be considered during any application development
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