/** * @file canvas_i.h * GUI: internal Canvas API */ #pragma once #include "canvas.h" #include #include /** Canvas structure */ struct Canvas { u8g2_t fb; CanvasOrientation orientation; uint8_t offset_x; uint8_t offset_y; uint8_t width; uint8_t height; CompressIcon* compress_icon; }; /** Allocate memory and initialize canvas * * @return Canvas instance */ Canvas* canvas_init(); /** Free canvas memory * * @param canvas Canvas instance */ void canvas_free(Canvas* canvas); /** Get canvas buffer. * * @param canvas Canvas instance * * @return pointer to buffer */ uint8_t* canvas_get_buffer(Canvas* canvas); /** Get canvas buffer size. * * @param canvas Canvas instance * * @return size of canvas in bytes */ size_t canvas_get_buffer_size(const Canvas* canvas); /** Set drawing region relative to real screen buffer * * @param canvas Canvas instance * @param offset_x x coordinate offset * @param offset_y y coordinate offset * @param width width * @param height height */ void canvas_frame_set( Canvas* canvas, uint8_t offset_x, uint8_t offset_y, uint8_t width, uint8_t height); /** Set canvas orientation * * @param canvas Canvas instance * @param orientation CanvasOrientation */ void canvas_set_orientation(Canvas* canvas, CanvasOrientation orientation); /** Get canvas orientation * * @param canvas Canvas instance * * @return CanvasOrientation */ CanvasOrientation canvas_get_orientation(const Canvas* canvas);