LVGL fix memory allocation of flush buffers (#21256)

CHANGELOG.md

@@ -18,6 +18,7 @@ All notable changes to this project will be documented in this file.
 - HASPmota `align` attribute and expand PNG cache
 - LVGL restore `lv_palette` functions
 - IPv6 support in safeboot
+- LVGL fix memory allocation of flush buffers
 
 ### Removed
 - LVGL disabled vector graphics

lib/lib_display/Display_Renderer-gemu-1.0/src/renderer.h

@@ -28,7 +28,7 @@
 // b. textcolor,textbgcolor => public;
 
 typedef struct LVGL_PARAMS {
-  uint16_t fluslines;
+  uint16_t flushlines;
   union {
     uint8_t data;
     struct {

lib/lib_display/UDisplay/uDisplay.cpp

@@ -142,7 +142,7 @@ uDisplay::uDisplay(char *lp) : Renderer(800, 600) {
   epc_full_cnt = 0;
   lut_num = 0;
   lvgl_param.data = 0;
-  lvgl_param.fluslines = 40;
+  lvgl_param.flushlines = 40;
   rot_t[0] = 0;
   rot_t[1] = 1;
   rot_t[2] = 2;
@@ -590,7 +590,7 @@ uDisplay::uDisplay(char *lp) : Renderer(800, 600) {
             lut3time = next_val(&lp1);
             break;
           case 'B':
-            lvgl_param.fluslines = next_val(&lp1);
+            lvgl_param.flushlines = next_val(&lp1);
             lvgl_param.data = next_val(&lp1);
             break;
           case 'M':

lib/lib_display/Xlatb_RA8876-gemu-1.0/RA8876.cpp

@@ -493,7 +493,7 @@ void RA8876::DisplayInit(int8_t p,int8_t size,int8_t rot,int8_t font) {
 
 bool RA8876::initDisplay() {
 
-  lvgl_param.fluslines = 10;
+  lvgl_param.flushlines = 10;
 
   SPI.beginTransaction(m_spiSettings);
 

lib/libesp32_eink/epdiy/src/epd4in7.cpp

@@ -63,7 +63,7 @@ int32_t Epd47::Init(void) {
   hl = epd_hl_init(WAVEFORM);
   epd47_buffer = epd_hl_get_framebuffer(&hl);
   framebuffer = epd47_buffer;
-  lvgl_param.fluslines = 10;
+  lvgl_param.flushlines = 10;
   return 0;
 }
 

tasmota/tasmota_xdrv_driver/xdrv_54_lvgl.ino

@@ -33,11 +33,10 @@
 struct LVGL_Glue {
   lv_display_t *lv_display = nullptr;
   lv_indev_t *lv_indev = nullptr;
-  lv_color_t *lv_pixel_buf = nullptr;
+  void *lv_pixel_buf = nullptr;
-  lv_color_t *lv_pixel_buf2 = nullptr;
+  void *lv_pixel_buf2 = nullptr;
   Ticker tick;
   File * screenshot = nullptr;
-  bool first_frame = true;  // Tracks if a call to `lv_flush_callback` needs to wait for DMA transfer to complete
 };
 LVGL_Glue * lvgl_glue;
 
@@ -70,10 +69,6 @@ void lv_flush_callback(lv_display_t *disp, const lv_area_t *area, uint8_t *color
     // save pixels to file
     int32_t btw = (width * height * LV_COLOR_DEPTH + 7) / 8;
     while (btw > 0) {
-#if (LV_COLOR_DEPTH == 16) && (LV_COLOR_16_SWAP == 1)
-      uint16_t * pix = (uint16_t*) color_p;
-      for (uint32_t i = 0; i < btw / 2; i++) (pix[i] = pix[i] << 8 | pix[i] >> 8);
-#endif
       if (btw > 0) {    // if we had a previous error (ex disk full) don't try to write anymore
         int32_t ret = lvgl_glue->screenshot->write((const uint8_t*) color_p, btw);
         if (ret >= 0) {
@@ -87,13 +82,6 @@ void lv_flush_callback(lv_display_t *disp, const lv_area_t *area, uint8_t *color
     return; // ok
   }
 
-  if (!lvgl_glue->first_frame) {
-      //renderer->dmaWait();  // Wait for prior DMA transfer to complete
-      //disrendererplay->endWrite(); // End transaction from any prior call
-  } else {
-      lvgl_glue->first_frame = false;
-  }
-
   uint32_t pixels_len = width * height;
   uint32_t chrono_start = millis();
   renderer->setAddrWindow(area->x1, area->y1, area->x1+width, area->y1+height);
@@ -407,16 +395,16 @@ void start_lvgl(const char * uconfig) {
   bool status_ok = true;
   size_t lvgl_buffer_size;
   do {
-    //lvgl_buffer_size = LV_HOR_RES_MAX * LV_BUFFER_ROWS;
+    uint32_t flushlines = renderer->lvgl_pars()->flushlines;
-    uint32_t flushlines = renderer->lvgl_pars()->fluslines;
     if (0 == flushlines) flushlines = LV_BUFFER_ROWS;
 
     lvgl_buffer_size = renderer->width() * flushlines;
     if (renderer->lvgl_pars()->use_dma) {
       lvgl_buffer_size /= 2;
       if (lvgl_buffer_size < 1000000) {
-        AddLog(LOG_LEVEL_ERROR, "LVG: Allocating buffer2 %i bytes in main memory (flushlines %i)", lvgl_buffer_size * sizeof(lv_color_t), flushlines);
+        // allocate preferably in internal memory which is faster than PSRAM
-        lvgl_glue->lv_pixel_buf2 = new lv_color_t[lvgl_buffer_size];
+        AddLog(LOG_LEVEL_DEBUG, "LVG: Allocating buffer2 %i bytes in main memory (flushlines %i)", (lvgl_buffer_size * (LV_COLOR_DEPTH / 8)) / 1024, flushlines);
+        lvgl_glue->lv_pixel_buf2 = heap_caps_malloc_prefer(lvgl_buffer_size * (LV_COLOR_DEPTH / 8), 2, MALLOC_CAP_8BIT | MALLOC_CAP_INTERNAL, MALLOC_CAP_8BIT);
       }
       if (!lvgl_glue->lv_pixel_buf2) {
         status_ok = false;
@@ -424,8 +412,9 @@ void start_lvgl(const char * uconfig) {
       }
     }
 
-    AddLog(LOG_LEVEL_ERROR, "LVG: Allocating buffer1 %i KB in main memory (flushlines %i)", (lvgl_buffer_size * sizeof(lv_color_t)) / 1024, flushlines);
+    // allocate preferably in internal memory which is faster than PSRAM
-    lvgl_glue->lv_pixel_buf = new lv_color_t[lvgl_buffer_size];
+    AddLog(LOG_LEVEL_DEBUG, "LVG: Allocating buffer1 %i KB in main memory (flushlines %i)", (lvgl_buffer_size * (LV_COLOR_DEPTH / 8)) / 1024, flushlines);
+    lvgl_glue->lv_pixel_buf = heap_caps_malloc_prefer(lvgl_buffer_size * (LV_COLOR_DEPTH / 8), 2, MALLOC_CAP_8BIT | MALLOC_CAP_INTERNAL, MALLOC_CAP_8BIT);
     if (!lvgl_glue->lv_pixel_buf) {
       status_ok = false;
       break;
@@ -434,11 +423,11 @@ void start_lvgl(const char * uconfig) {
 
   if (!status_ok) {
     if (lvgl_glue->lv_pixel_buf) {
-      delete[] lvgl_glue->lv_pixel_buf;
+      free(lvgl_glue->lv_pixel_buf);
       lvgl_glue->lv_pixel_buf = NULL;
     }
     if (lvgl_glue->lv_pixel_buf2) {
-      delete[] lvgl_glue->lv_pixel_buf2;
+      free(lvgl_glue->lv_pixel_buf2);
       lvgl_glue->lv_pixel_buf2 = NULL;
     }
     delete lvgl_glue;
@@ -450,7 +439,7 @@ void start_lvgl(const char * uconfig) {
   // Initialize LvGL display driver
   lvgl_glue->lv_display = lv_display_create(renderer->width(), renderer->height());
   lv_display_set_flush_cb(lvgl_glue->lv_display, lv_flush_callback);
-  lv_display_set_buffers(lvgl_glue->lv_display, lvgl_glue->lv_pixel_buf, lvgl_glue->lv_pixel_buf2, lvgl_buffer_size, LV_DISPLAY_RENDER_MODE_PARTIAL);
+  lv_display_set_buffers(lvgl_glue->lv_display, lvgl_glue->lv_pixel_buf, lvgl_glue->lv_pixel_buf2, lvgl_buffer_size * (LV_COLOR_DEPTH / 8), LV_DISPLAY_RENDER_MODE_PARTIAL);
 
   // Initialize LvGL input device (touchscreen already started)
   lvgl_glue->lv_indev = lv_indev_create();