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Portable Network Graphic  |  1990-09-25  |  14.6 KB  |  551x719  |  1-bit (2 colors)
   ocr: OFFSCHEEN GRAPHICS ENYIRONMENTS With Color QuckDraw, pixel images are transterred using data from TheGDevice to determine the destination color intormation. Consequently, whenever copying to an oftscreen pixel map with characteristics differing from TheGDevice- -usually the main screen-it is necessary to create an appropriate oftscreen Glevice and set it as the curent Glevice before the copy. I an oftscreen pixel map is only copied from, then no oftscreen Glevice is needed, since Color QuickDraw obtains the source color information from the source pixel map. When creating an ottscreen GDevice, ...