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Kelly Martin authored
* app/undo.c: Fixed another use of array of gpointer in place of a proper struct, this time in undo_(push|pop)_channel_mod. * base/base-types.h * base/tile-manager.h * base/tile-manager-private.h * base/tile-manager.c: added PixelDataHandle as an abstraction on top of tiles. PixelDataHandles either return a pointer into the tile data, or create a temporary buffer so the calling function can access data from disparate tiles using a single buffer. This is a step in reducing the dependence of core image functions being aware of tiles as well as a step toward having a single abstraction for pixel data. * app/image_map.c: changed to use read_pixel_data_1 * app/pixel-region.c: changed to use the read_pixel_data and write_pixel_data where practical.
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