Heap Requirements for Graphics Objects

Memory Requirements for Graphics Applications

MPLAB XC16 CompilerMPLAB XC32 Compiler
Graphics ComponentFlashRAMHeapFlashRAMHeap
Primitive Layer32856608868530
Graphics Object Layer
Overhead		21243220 per
Style
Scheme		54002828 per
Style
Scheme
Button1131388 per
Instance		27481244 per
Instance
Check Box100828 per
Instance		2320436 per
Instance
Radio Button11141426 per
Instance		26322044 per
Instance
Slider/Scroll Bar23522032 per
Instance		57202444 per
Instance
Static Text792822 per
Instance		18841236 per
Instance
Progress Bar10721224 per
Instance		24521632 per
Instance
Group Box960824 per
Instance		21241236 per
Instance
Window807224 per
Instance		1996440 per
Instance
List Box2094628 per
Instance		25801244 per
Instance
Edit Box1008226 per
Instance		2332440 per
Instance
Meter25204240 per
Instance		67884068 per
Instance
Box1092832 per
Instance		32281240 per
Instance

All memory requirements are in bytes.

Calculating the Required Heap Size

Most of the graphical components require some amount of memory set aside for the heap. Just how much is needed is determined by adding the memory requirements of each component module in the created routine. The overhead of the Graphics Object Layer is always included along with the requirements of each instance of the objects used.

 Example

For a PIC32 application which utilizesone style scheme and has one screen, which contains:

  • Six button objects
  • One dial object
  • Two Meter objects

and requires the following memory (in bytes):

FlashRAMHeap
Graphics Object Layer Overhead54002828
Button Objects (6X)274812266= 44 bytes/Button X 6 Buttons
Dial Object (1X)32281240
Meter Object (2X)678840136= 68 bytes/Meter X 2 Meters
466 Bytes needed for heap