Adafruit_GFX_Buffer

This library combines an Adafruit_GFX based display object and a GFXcanvas16 object into one. This lets the display have a framebuffer thus allowing for more efficient use of SPI calls when drawing lots of things.

Syntax is as follows

Adafruit_GFX_Buffer<ADAFRUIT_DISPLAY_CLASS>(DISPLAY_WIDTH, DISPLAY_HEIGHT, DISPLAY_CONSTRUCTOR);

Not much has to be changed to make use of the framebuffer, here's an example for an ST7735 based display. Here is the normal initializaition:

#include <Adafruit_GFX.h>
#include <Adafruit_ST7735.h>

Adafruit_ST7735 display = Adafruit_ST7735(&SPI, 35, 34, 33);

Here is the framebuffer initialization:

#include <Adafruit_GFX_Buffer.h>
#include <Adafruit_GFX.h>
#include <Adafruit_ST7735.h>

Adafruit_GFX_Buffer<Adafruit_ST7735> display = Adafruit_GFX_Buffer<Adafruit_ST7735>(80, 160,  Adafruit_ST7735(&SPI, 35, 34, 33)  );

When you are ready to send the framebuffer to your display you simply call the display function like this:

display.display();

See examples for more.