Merge pull request #7 from gilesp1729/master

Allow caller to control when screen is updated

Author: facchinm

src/Arduino_GigaDisplay_GFX.cpp

@@ -40,7 +40,21 @@ void GigaDisplay_GFX::startWrite() {
 
 void GigaDisplay_GFX::endWrite() {
   //refresh_sem.release();
-  _refresh_thd->flags_set(0x1);
+  if (!buffering)
+    _refresh_thd->flags_set(0x1);
+}
+
+// If buffering, defer endWrite calls until endBuffering is called.
+void GigaDisplay_GFX::startBuffering() {
+  buffering = true;
+}
+
+void GigaDisplay_GFX::endBuffering() {
+  if (buffering)
+  {
+    buffering = false;
+    endWrite();
+  }
 }
 
 void GigaDisplay_GFX::drawPixel(int16_t x, int16_t y, uint16_t color) {
@@ -102,6 +116,7 @@ uint16_t GigaDisplay_GFX::getRawPixel(int16_t x, int16_t y) {
 
 void GigaDisplay_GFX::fillScreen(uint16_t color) {
   if (hasBuffer()) {
+	startWrite();	// PR #3
     uint8_t hi = color >> 8, lo = color & 0xFF;
     if (hi == lo) {
       memset(buffer, lo, WIDTH * HEIGHT * 2);
@@ -110,6 +125,7 @@ void GigaDisplay_GFX::fillScreen(uint16_t color) {
       for (i = 0; i < pixels; i++)
         buffer[i] = color;
     }
+    endWrite();		// PR #3
   }
 }
 
@@ -215,19 +231,23 @@ void GigaDisplay_GFX::drawFastHLine(int16_t x, int16_t y, int16_t w,
 
 void GigaDisplay_GFX::drawFastRawVLine(int16_t x, int16_t y, int16_t h,
                                        uint16_t color) {
+  startWrite();
   // x & y already in raw (rotation 0) coordinates, no need to transform.
   uint16_t *buffer_ptr = buffer + y * WIDTH + x;
   for (int16_t i = 0; i < h; i++) {
     (*buffer_ptr) = color;
     buffer_ptr += WIDTH;
   }
+  endWrite();
 }
 
 void GigaDisplay_GFX::drawFastRawHLine(int16_t x, int16_t y, int16_t w,
                                        uint16_t color) {
+  startWrite();
   // x & y already in raw (rotation 0) coordinates, no need to transform.
   uint32_t buffer_index = y * WIDTH + x;
   for (uint32_t i = buffer_index; i < buffer_index + w; i++) {
     buffer[i] = color;
   }
+  endWrite();
 }

src/Arduino_GigaDisplay_GFX.h

@@ -31,6 +31,8 @@ class GigaDisplay_GFX : public Adafruit_GFX {
 
     void startWrite();
     void endWrite();
+    void startBuffering();
+    void endBuffering();
 
     uint16_t color565(uint8_t red, uint8_t green, uint8_t blue) {
       return ((red & 0xF8) << 8) | ((green & 0xFC) << 3) | (blue >> 3);
@@ -45,7 +47,8 @@ class GigaDisplay_GFX : public Adafruit_GFX {
   private:
     Arduino_H7_Video* display;
     void refresh_if_needed();
-    bool need_refresh = false;
+    //bool need_refresh = false;
+    bool buffering = false;
     uint32_t last_refresh = 0;
     rtos::Thread* _refresh_thd;
 };