Internal structure is implemented as pointer to array of pointers to data because dynamic array is in fact pointer to array data. This is native way to express two dimensional array in pascal. Some mass operation as filling rectangular region could be optimized using Move and FillChar functions. But some graphic operation could be further optimized by not doing coordinate calculations for every pixel and rather do pixel pointer shifting by simple memory pointer addition. TColor32 = type Cardinal TColor32Component = ( ccBlue, ccGreen, ccRed, ccAlpha ) TColor32Entry = packed record case Integer of 0 : ( B, G, R, A : Byte ) 1 : ( ARGB : TColor32 ) 2 : ( Planes : array of Byte ) 3 : ( Components : array of Byte ) end Bitmap structureīitmap class should provide direct pixel access given by X, Y coordinate. We can use simple integer pixels which would be faster on 32-bit platform: Here you can found some known ways to define pixel type. Pixel type can be written in various ways to define its size and internal channel structure.
#Bitmap pixel sorter how to#
This articles shows how to achieve a custom bitmap structure that is then copied to a TBitmap to render it on the screen.
Support for bit-level pixel size and addressing.Abstract program constructions as property, static and virtual methods, dynamic two dimensional arrays.Facility for automatic image updating and redrawing (notifications and mass operation optimization).You can also use existing Graphics libraries.ĭirect pixel access in libraries is generally slowed-down by more factors: To achieve best drawing speed it can be useful to use specialized bitmap structures and routines.
But most of available graphic routines have some overhead given by universality, platform independence and safety. Standard graphical LCL components provides Canvas object for common drawing.
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