Merge pull request #552 from espressif/feat/lvgl_port_touch_scale

feat(lvgl_port): Add scaling feature for touch

Author: espzav

components/esp_lvgl_port/CHANGELOG.md

@@ -1,5 +1,10 @@
 # Changelog
 
+## 2.6.0
+
+### Features
+- Scaling feature in touch
+
 ## 2.5.0
 
 ### Features (Functional change for button v4 users)

components/esp_lvgl_port/README.md

@@ -108,6 +108,9 @@ Add touch input to the LVGL. It can be called more times for adding more touch i
     lvgl_port_remove_touch(touch_handle);
 ```
 
+> [!NOTE]
+> If the screen has another resolution than the touch resolution, you can use scaling by add `.scale.x` or `.scale.y` into `lvgl_port_touch_cfg_t` configuration structure.
+
 ### Add buttons input
 
 Add buttons input to the LVGL. It can be called more times for adding more buttons inputs for different displays. This feature is available only when the component `espressif/button` was added into the project.

components/esp_lvgl_port/include/esp_lvgl_port_touch.h

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2024-2025 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -32,8 +32,12 @@ extern "C" {
  * @brief Configuration touch structure
  */
 typedef struct {
-    lv_display_t *disp;    /*!< LVGL display handle (returned from lvgl_port_add_disp) */
-    esp_lcd_touch_handle_t   handle;   /*!< LCD touch IO handle */
+    lv_display_t           *disp;    /*!< LVGL display handle (returned from lvgl_port_add_disp) */
+    esp_lcd_touch_handle_t handle;   /*!< LCD touch IO handle */
+    struct {
+        float x;
+        float y;
+    } scale;                        /*!< Touch scale */
 } lvgl_port_touch_cfg_t;
 
 /**

components/esp_lvgl_port/src/lvgl8/esp_lvgl_port_touch.c

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2024-2025 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -19,6 +19,10 @@ static const char *TAG = "LVGL";
 typedef struct {
     esp_lcd_touch_handle_t   handle;     /* LCD touch IO handle */
     lv_indev_drv_t           indev_drv;  /* LVGL input device driver */
+    struct {
+        float x;
+        float y;
+    } scale;                            /* Touch scale */
 } lvgl_port_touch_ctx_t;
 
 /*******************************************************************************
@@ -44,6 +48,8 @@ lv_indev_t *lvgl_port_add_touch(const lvgl_port_touch_cfg_t *touch_cfg)
         return NULL;
     }
     touch_ctx->handle = touch_cfg->handle;
+    touch_ctx->scale.x = (touch_cfg->scale.x ? touch_cfg->scale.x : 1);
+    touch_ctx->scale.y = (touch_cfg->scale.y ? touch_cfg->scale.y : 1);
 
     /* Register a touchpad input device */
     lv_indev_drv_init(&touch_ctx->indev_drv);
@@ -92,8 +98,8 @@ static void lvgl_port_touchpad_read(lv_indev_drv_t *indev_drv, lv_indev_data_t *
     bool touchpad_pressed = esp_lcd_touch_get_coordinates(touch_ctx->handle, touchpad_x, touchpad_y, NULL, &touchpad_cnt, 1);
 
     if (touchpad_pressed && touchpad_cnt > 0) {
-        data->point.x = touchpad_x[0];
-        data->point.y = touchpad_y[0];
+        data->point.x = touch_ctx->scale.x * touchpad_x[0];
+        data->point.y = touch_ctx->scale.y * touchpad_y[0];
         data->state = LV_INDEV_STATE_PRESSED;
     } else {
         data->state = LV_INDEV_STATE_RELEASED;

components/esp_lvgl_port/src/lvgl9/esp_lvgl_port_touch.c

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2024-2025 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -19,6 +19,10 @@ static const char *TAG = "LVGL";
 typedef struct {
     esp_lcd_touch_handle_t  handle;     /* LCD touch IO handle */
     lv_indev_t              *indev;     /* LVGL input device driver */
+    struct {
+        float x;
+        float y;
+    } scale;                            /* Touch scale */
 } lvgl_port_touch_ctx_t;
 
 /*******************************************************************************
@@ -47,6 +51,8 @@ lv_indev_t *lvgl_port_add_touch(const lvgl_port_touch_cfg_t *touch_cfg)
         return NULL;
     }
     touch_ctx->handle = touch_cfg->handle;
+    touch_ctx->scale.x = (touch_cfg->scale.x ? touch_cfg->scale.x : 1);
+    touch_ctx->scale.y = (touch_cfg->scale.y ? touch_cfg->scale.y : 1);
 
     if (touch_ctx->handle->config.int_gpio_num != GPIO_NUM_NC) {
         /* Register touch interrupt callback */
@@ -122,8 +128,8 @@ static void lvgl_port_touchpad_read(lv_indev_t *indev_drv, lv_indev_data_t *data
     bool touchpad_pressed = esp_lcd_touch_get_coordinates(touch_ctx->handle, touchpad_x, touchpad_y, NULL, &touchpad_cnt, 1);
 
     if (touchpad_pressed && touchpad_cnt > 0) {
-        data->point.x = touchpad_x[0];
-        data->point.y = touchpad_y[0];
+        data->point.x = touch_ctx->scale.x * touchpad_x[0];
+        data->point.y = touch_ctx->scale.y * touchpad_y[0];
         data->state = LV_INDEV_STATE_PRESSED;
     } else {
         data->state = LV_INDEV_STATE_RELEASED;