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include/liblvgl/draw/lv_draw_layer.h

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+/**
+ * @file lv_draw_layer.h
+ *
+ */
+
+#ifndef LV_DRAW_LAYER_H
+#define LV_DRAW_LAYER_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+#include "liblvgl/lv_conf_internal.h"
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+struct _lv_draw_ctx_t;
+struct _lv_draw_layer_ctx_t;
+
+typedef enum {
+    LV_DRAW_LAYER_FLAG_NONE,
+    LV_DRAW_LAYER_FLAG_HAS_ALPHA,
+    LV_DRAW_LAYER_FLAG_CAN_SUBDIVIDE,
+} lv_draw_layer_flags_t;
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+
+/**
+ * Create a new layer context. It is used to start and independent rendering session
+ * with the current draw_ctx
+ * @param draw_ctx      pointer to the current draw context
+ * @param layer_area    the coordinates of the layer
+ * @param flags         OR-ed flags from @lv_draw_layer_flags_t
+ * @return              pointer to the layer context, or NULL on error
+ */
+struct _lv_draw_layer_ctx_t * lv_draw_layer_create(struct _lv_draw_ctx_t * draw_ctx, const lv_area_t * layer_area,
+                                                   lv_draw_layer_flags_t flags);
+
+/**
+ * Adjust the layer_ctx and/or draw_ctx based on the `layer_ctx->area_act`.
+ * It's called only if flags has `LV_DRAW_LAYER_FLAG_CAN_SUBDIVIDE`
+ * @param draw_ctx      pointer to the current draw context
+ * @param layer_ctx     pointer to a layer context
+ * @param flags         OR-ed flags from @lv_draw_layer_flags_t
+ */
+void lv_draw_layer_adjust(struct _lv_draw_ctx_t * draw_ctx, struct _lv_draw_layer_ctx_t * layer_ctx,
+                          lv_draw_layer_flags_t flags);
+
+/**
+ * Blend a rendered layer to `layer_ctx->area_act`
+ * @param draw_ctx      pointer to the current draw context
+ * @param layer_ctx     pointer to a layer context
+ * @param draw_dsc      pointer to an image draw descriptor
+ */
+void lv_draw_layer_blend(struct _lv_draw_ctx_t * draw_ctx, struct _lv_draw_layer_ctx_t * layer_ctx,
+                         lv_draw_img_dsc_t * draw_dsc);
+
+/**
+ * Destroy a layer context.
+ * @param draw_ctx      pointer to the current draw context
+ * @param layer_ctx     pointer to a layer context
+ */
+void lv_draw_layer_destroy(struct _lv_draw_ctx_t * draw_ctx, struct _lv_draw_layer_ctx_t * layer_ctx);
+
+/**********************
+ *      MACROS
+ **********************/
+
+#ifdef __cplusplus
+} /*extern "C"*/
+#endif
+
+#endif /*LV_DRAW_LAYER_H*/