Quicktime File Format (2012-08-14).pdf

Media Data Atom TypesText MediaDisplay flagsA 32-bit integer containing flags that describe how the text should be drawn. The following flags aredefined.Don’t auto scaleControls text scaling. If this flag is set to 1, the text media handler reflows the text instead ofscaling when the track is scaled. This flag’s value is 0x0002.Use movie background colorControls background color. If this flag is set to 1, the text media handler ignores the backgroundcolor field in the text sample description and uses the movie’s background color instead. Thisflag’s value is 0x0008.Scroll inControls text scrolling. If this flag is set to 1, the text media handler scrolls the text until the lastof the text is in view. This flag’s value is 0x0020.Scroll outControls text scrolling. If this flag is set to 1, the text media handler scrolls the text until the lastof the text is gone. This flag’s value is 0x0040.Horizontal scrollControls text scrolling. If this flag is set to 1, the text media handler scrolls the text horizontally;otherwise, it scrolls the text vertically. This flag’s value is 0x0080.Reverse scrollControls text scrolling. If this flag is set to 1, the text media handler scrolls down (if scrollingvertically) or backward (if scrolling horizontally; note that horizontal scrolling also depends upontext justification). This flag’s value is 0x0100.Continuous scrollControls text scrolling. If this flag is set to 1, the text media handler displays new samples byscrolling out the old ones. This flag’s value is 0x0200.Drop shadowControls drop shadow. If this flag is set to 1, the text media handler displays the text with a dropshadow. This flag’s value is 0x1000.Anti-aliasControls anti-aliasing. If this flag is set to 1, the text media handler uses anti-aliasing when drawingtext. This flag’s value is 0x2000.Key text2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.194