lvgl9: fix rotation for Giga display shield

Author: facchinm

libraries/Arduino_H7_Video/src/Arduino_H7_Video.cpp

@@ -105,7 +105,7 @@ int Arduino_H7_Video::begin() {
     lv_display_t *display;
     if(_rotated) {
       display = lv_display_create(height(), width());
-      lv_display_set_rotation(display, LV_DISPLAY_ROTATION_270);
+      lv_display_set_rotation(display, LV_DISPLAY_ROTATION_90);
       //display->sw_rotate = 1;
     } else {
       display = lv_display_create(width(), height());
@@ -194,28 +194,38 @@ void Arduino_H7_Video::set(int x, int y, uint8_t r, uint8_t g, uint8_t b) {
 #endif
 
 #if __has_include("lvgl.h")
-static uint8_t* dst = nullptr;
+static uint8_t* rotated_buf = nullptr;
 void lvgl_displayFlushing(lv_display_t * disp, const lv_area_t * area, unsigned char * px_map) {
-    uint32_t width      = lv_area_get_width(area);
-    uint32_t height     = lv_area_get_height(area);
-    uint32_t offsetPos  = (area->x1 + (dsi_getDisplayXSize() * area->y1)) * sizeof(uint16_t);
+    uint32_t w     = lv_area_get_width(area);
+    uint32_t h     = lv_area_get_height(area);
+    lv_area_t* area_in_use = (lv_area_t *)area;
 
     // TODO: find a smart way to tackle sw rotation
-/*
-    if (lv_display_get_rotation(disp) != LV_DISPLAY_ROTATION_0) {
-      if (dst != nullptr) {
-        free(dst);
-      }
-      dst = (uint8_t*)malloc(width * height * 2);
-      lv_draw_sw_rotate(px_map, dst, height, width,
-          height * 2,
-          width * 2,
-          lv_display_get_rotation(disp), LV_COLOR_FORMAT_RGB565);
-      px_map = dst;
+    lv_display_rotation_t rotation = lv_display_get_rotation(disp);
+    lv_area_t rotated_area;
+    if (rotation != LV_DISPLAY_ROTATION_0) {
+        rotated_buf = (uint8_t*)realloc(rotated_buf, w * h * 4);
+        lv_color_format_t cf = lv_display_get_color_format(disp);
+        lv_draw_sw_rotate(px_map, rotated_buf,
+                          w, h, lv_draw_buf_width_to_stride(w, cf),
+                          lv_draw_buf_width_to_stride(h, cf),
+                          LV_DISPLAY_ROTATION_270, cf);
+        rotated_area.x1 = area->y1;
+        rotated_area.y2 = lv_display_get_horizontal_resolution(disp) - area->x1 - 1;
+        //rotated_area.y2 = dsi_getDisplayYSize() - area->x1 - 1;
+        rotated_area.x2 = rotated_area.x1 + h - 1;
+        rotated_area.y1 = rotated_area.y2 - w + 1;
+
+        area_in_use = &rotated_area;
+        px_map = rotated_buf;
+        auto temp = w;
+        w = h;
+        h = temp;
     }
-*/
 
-    dsi_lcdDrawImage((void *) px_map, (void *)(dsi_getActiveFrameBuffer() + offsetPos), width, height, DMA2D_INPUT_RGB565);
+    uint32_t offsetPos  = (area_in_use->x1 + (dsi_getDisplayXSize() * area_in_use->y1)) * sizeof(uint16_t);
+
+    dsi_lcdDrawImage((void *) px_map, (void *)(dsi_getActiveFrameBuffer() + offsetPos), w, h, DMA2D_INPUT_RGB565);
     lv_display_flush_ready(disp);         /* Indicate you are ready with the flushing*/
 }
 #endif