74 lines
3 KiB
C
74 lines
3 KiB
C
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/* Copyright 2021 Jonathan Rascher
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* Common interface for an OLED pet (animated critter that reacts to typing).
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* Please link exactly one accompanying .c file to implement these functions.
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*/
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#pragma once
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#include <stdbool.h>
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#include <stdint.h>
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#include "bcat_oled.h"
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/* Opaque token representing a single frame of the OLED pet animation.
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* Different pet implementations have different valid state values, but the
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* zero value must always represent the default state of the pet at startup.
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*/
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typedef uint16_t oled_pet_state_t;
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/* Returns the number of bytes used to represent the animation frame (in
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* oled_write_raw_P format). Note that every state the pet supports is expected
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* to have the same frame size.
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*/
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uint16_t oled_pet_frame_bytes(void);
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/* Returns the number of lines of the OLED occupied by the animation. Note that
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* every state the pet supports is expected to have the same frame size. The
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* returned value does not include the one line of padding that render_oled_pet
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* uses to account for "jumping".
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*/
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uint8_t oled_pet_frame_lines(void);
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/* Returns whether or not the OLED pet should "jump" when the spacebar is
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* pressed. (The render_oled_pet implementation shifts the animation frame up
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* one line when this happens.)
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*/
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bool oled_pet_can_jump(void);
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/* Returns the delay before the next animation frame should be displayed. */
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uint16_t oled_pet_update_millis(const oled_keyboard_state_t *keyboard_state);
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/* Returns the state of the pet to be animated on the next animation tick. */
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oled_pet_state_t oled_pet_next_state(oled_pet_state_t state, const oled_keyboard_state_t *keyboard_state);
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/* Called after the OLED pet is rendered during each OLED task invocation.
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* Receives the same keyboard state as render_oled_pet. The redraw param
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* indicates whether or not an OLED frame was just redrawn, allowing a specific
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* pet implementation to draw custom things atop its animation frames.
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*
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* When this function is called, the cursor will be in an unspecified location,
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* not necessarily the top-left corner of the OLED pet.
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*/
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void oled_pet_post_render(uint8_t col, uint8_t line, const oled_keyboard_state_t *keyboard_state, bool redraw);
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/* Returns a PROGMEM pointer to the specified frame buffer for the specified
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* state. The animation frame has length given by oled_pet_frame_bytes and is
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* formatted as expected by oled_write_raw_P.
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*/
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const char *oled_pet_frame(oled_pet_state_t state);
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