https://wikiti.brandonw.net/index.php?action=history&feed=atom&title=84PCSE%3ABCALLs%3A54A0 2026-05-21T08:33:18Z Revision history for this page on the wiki MediaWiki 1.23.5 https://wikiti.brandonw.net/index.php?title=84PCSE:BCALLs:54A0&diff=10196&oldid=prev 2013-10-20T17:33:12Z

<p>UnHighlightRect</p> <p><b>New page</b></p><div>[[Category:84PCSE:BCALLs:By Name|UnHighlightRect]] [[Category:84PCSE:BCALLs:By Name:Drawing|UnHighlightRect]] [[Category:84PCSE:BCALLs:By Address|54A0 - UnHighlightRect]]<br /> == Synopsis ==<br /> '''Unofficial Name:''' UnHighlightRect<br /> <br /> '''BCALL Address:''' 54A0h<br /> <br /> Un-highlight a rectangular area of the LCD by changing non-black pixels to white.<br /> <br /> === Inputs ===<br /> * HL = X coordinate of left edge<br /> * DE = X coordinate of right edge (must be greater than or equal to HL and at most 319)<br /> * B = Y coordinate of top edge (from top of screen)<br /> * C = Y coordinate of bottom edge (must be greater than or equal to B and at most 239)<br /> <br /> === Outputs ===<br /> '''None'''<br /> <br /> === Destroys ===<br /> * AF<br /> <br /> == Comments ==<br /> The rectangle is drawn only to the LCD, never to the graph buffer.<br /> <br /> This is designed to reverse the effect of [[84PCSE:BCALLs:54A3|HighlightRect]]. For each pixel in the rectangle, if its most significant byte is zero (i.e., the color is either black, blue, or blue plus a very small amount of green), the pixel will be set to black. Otherwise it will be set to white. (The fact that blue pixels are treated as black may be a mistake on TI's part, but in any case, it is clear that this routine isn't intended to be used for anything other than black-and-white text.)<br /> <br /> The dimensions of the highlighted area are (HL-DE+1) × (C-B+1). The routine doesn't check that the provided coordinates are valid.<br /> <br /> The interrupt state (IFF) is preserved.<br /> <br /> == See also ==<br /> [[84PCSE:BCALLs:54A3|HighlightRect]]</div>

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