Add frame buffer for scaled picture

lib/obp60task/OBP60Extensions.cpp

@@ -60,10 +60,15 @@ GxEPD2_BW<GxEPD2_420_SE0420NQ04, GxEPD2_420_SE0420NQ04::HEIGHT> & getdisplay(){r
 // panel device + offscreen shadow framebuffer
 static LGFX panelDisplay;
 static LGFXCanvas shadowDisplay(&panelDisplay);
+static LGFXCanvas scaleDisplay(&panelDisplay);
 static bool shadowDisplayInitialized = false;
+static bool scaleDisplayInitialized = false;
+static uint16_t scaleDisplayWidth = 0;
+static uint16_t scaleDisplayHeight = 0;
 
 LGFXCanvas & getdisplay(){return shadowDisplay;}
 LGFX & getpaneldisplay(){return panelDisplay;}
+LGFXCanvas & getscaleddisplay(){return scaleDisplay;}
 
 bool initDisplayShadowBuffer(){
     if (shadowDisplayInitialized) return true;
@@ -81,6 +86,29 @@ bool initDisplayShadowBuffer(){
     shadowDisplayInitialized = true;
     return true;
 }
+
+bool initDisplayScaleBuffer(uint16_t width, uint16_t height){
+    if (scaleDisplayInitialized && scaleDisplayWidth == width && scaleDisplayHeight == height) {
+        return true;
+    }
+
+    scaleDisplay.deleteSprite();
+    scaleDisplay.setPsram(true);
+    scaleDisplay.setColorDepth(16);
+    scaleDisplay.setTextDatum(textdatum_t::baseline_left);
+
+    if (scaleDisplay.createSprite(width, height) == nullptr) {
+        scaleDisplayInitialized = false;
+        scaleDisplayWidth = 0;
+        scaleDisplayHeight = 0;
+        return false;
+    }
+
+    scaleDisplayWidth = width;
+    scaleDisplayHeight = height;
+    scaleDisplayInitialized = true;
+    return true;
+}
 #endif
 
 // Horter I2C moduls

lib/obp60task/OBP60Extensions.h

@@ -423,7 +423,9 @@ private:
 
 LGFXCanvas & getdisplay();
 LGFX & getpaneldisplay();
+LGFXCanvas & getscaleddisplay();
 bool initDisplayShadowBuffer();
+bool initDisplayScaleBuffer(uint16_t width, uint16_t height);
 #endif
 
 // Page display return values
@@ -568,12 +570,10 @@ inline void displayNextPage() {
         const uint16_t drawX = static_cast<uint16_t>((dstW - targetW) / 2U);
         const uint16_t drawY = static_cast<uint16_t>((dstH - targetH) / 2U);
 
-        dst.startWrite();
         const uint16_t borderColor = src.readPixel(0, 0);
-        if (drawX > 0) {
+        if (initDisplayScaleBuffer(dstW, dstH)) {
-            dst.fillRect(0, drawY, drawX, targetH, borderColor);
+            LGFXCanvas &scaled = getscaleddisplay();
-            dst.fillRect(drawX + targetW, drawY, dstW - (drawX + targetW), targetH, borderColor);
+            scaled.fillScreen(borderColor);
-        }
 
             for (uint16_t y = 0; y < targetH; ++y) {
                 const uint32_t syfp = (targetH > 1)
@@ -597,13 +597,17 @@ inline void displayNextPage() {
                     const uint16_t color = src.readPixel(sx0, sy0);
                     #endif
 
-                dst.drawPixel(drawX + x, drawY + y, color);
+                    scaled.drawPixel(drawX + x, drawY + y, color);
                 }
                 if ((y & 0x0F) == 0) {
                     yield();
                 }
             }
-        dst.endWrite();
+
+            scaled.pushSprite(0, 0);
+        } else {
+            src.pushSprite(drawX, drawY);
+        }
         #endif
     }
     #else