enable proper buffered output from hwpixel

This got pretty ugly. Relied on some strange assumptions and special conditions to know when to use ```getOffsetColor``` in various ways. Seems to work however. May cause incompatibility with color sequences from HyperDisplay

Author: Owen L - SFE

src/HyperDisplay_SSD1309.cpp

@@ -1,6 +1,7 @@
 #include "HyperDisplay_SSD1309.h"
 
-
+const SSD1309_Bite_t ON = { 0x01 };
+const SSD1309_Bite_t OFF = { 0x00 };
 
 SSD1309::SSD1309(uint16_t xSize, uint16_t ySize, SSD1309_Intfc_t interface) : hyperdisplay(xSize, ySize)
 {
@@ -37,8 +38,29 @@ color_t 	getOffsetColor(color_t base, uint32_t numPixels);	// (required by hyper
 */
 color_t 	SSD1309::getOffsetColor(color_t base, uint32_t numPixels)
 {	
+	// For the SSD1309 this function will depend on the current window if it is available
+	wind_info_t* pwindow = pCurrentWindow;
+	if(pwindow != NULL){
+		SSD1309_Bite_t* mirror = (SSD1309_Bite_t*)pwindow->data;
+		if(mirror != NULL){
+			// Assume left->right top->bottom for full window width
+			uint8_t window_width = (pwindow->xMax - pwindow->xMin + 1);
+			uint8_t x = numPixels % window_width;
+			uint8_t y = numPixels / window_width;
+			uint8_t temp = (*(mirror + ((window_width * (y/8)) + x))).bite;
+			if(temp & (0x01 << (y % 8))){
+				return (color_t)0x01;
+			}else{
+				return (color_t)0x00;
+			}
+		}else{
+			return base; // Also be dumb when there is no mirror data
+		}
+	}else{
+		// When little information available fall back to 'dumb' implementation
+		return base;
+	}
 	return base;
-	// return (color_t)(((SSD1309_Bite_t*)base + numPixels/8));
 }
 
 SSD1309_Status_t		SSD1309::refreshDisplay( void )
@@ -142,6 +164,14 @@ void SSD1309::hwpixel(hd_hw_extent_t x0, hd_hw_extent_t y0, color_t data, hd_col
 	startColorOffset = getNewColorOffset(colorCycleLength, startColorOffset, 0);	// This line is needed to condition the user's input start color offset because it could be greater than the cycle length
 	color_t value = getOffsetColor(data, startColorOffset);
 
+	// If value is either 0 or 1 then interpret it as a direct value...
+	if((uint32_t)data == 0x00){
+		value = (color_t)&OFF;
+	}
+	if((uint32_t)data == 0x01){
+		value = (color_t)&ON;
+	}
+
 	SSD1309_Bite_t user = *((SSD1309_Bite_t*)value);
 	if(user.b0){									// Check if the user's bit is set or not (this implies that the user should always set bit 0 of a 'bite' to the pixel value they want)
 		// Need to set the pixel high	
@@ -213,7 +243,8 @@ void SSD1309::swpixel( hd_extent_t x0, hd_extent_t y0, color_t data, hd_colors_t
 	if(colorCycleLength == 0){ return; }
 
 	startColorOffset = getNewColorOffset(colorCycleLength, startColorOffset, 0);	// This line is needed to condition the user's input start color offset because it could be greater than the cycle length
-	color_t value = getOffsetColor(data, startColorOffset);
+	// color_t value = getOffsetColor(data, startColorOffset);
+	color_t value = data; 																												// have to skip color sequences in buffered writing mode
 
 	hd_hw_extent_t x0w = (hd_hw_extent_t)x0;	// Cast to hw extent type to be sure of integer values
 	hd_hw_extent_t y0w = (hd_hw_extent_t)y0;