circuitpython/shared-module/adafruit_pixelbuf/PixelBuf.h

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/*
* This file is part of the CircuitPython project, https://github.com/adafruit/circuitpython
*
* The MIT License (MIT)
*
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* Copyright (c) 2018 Rose Hooper
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
Add adafruit_pixelmap.PixelMap .. a fast helper for animations. It is similar to and inspired by the PixelMap helper in Adafruit LED Animation library, but with an extremely fast 'paste' method for setting a series of pixels. This is a common operation for many animations, and can give a substantial speed improvement. It's named `adafruit_pixelmap` so that we can package a compatible version in pure Python for systems that can't fit it in C in flash, or for Blinka. This is a proof of concept and can make a very fast comet animation: ```python import time import adafruit_pixelbuf import adafruti_pixelmap import board import neopixel from supervisor import ticks_ms from adafruit_led_animation.animation.solid import Solid from adafruit_led_animation import color pixel_pin = board.GP0 pixel_num = 96 pixels = neopixel.NeoPixel(pixel_pin, pixel_num, brightness=1, auto_write=False, pixel_order="RGB") evens = adafruit_pixelmap.PixelMap(pixels, tuple(range(0, pixel_num, 2))) odd_indices = tuple((i, i+2) for i in range(1, pixel_num, 4)) print(odd_indices) odds = adafruit_pixelbuf.PixelMap(pixels, odd_indices) assert len(odds) == len(odd_indices) comet_length = 16 comet1 = [color.calculate_intensity(color.GREEN, ((1+i) / comet_length) ** 2.4) for i in range(comet_length)] comet2 = [color.calculate_intensity(color.PURPLE, ((1+i) / comet_length) ** 2.4) for i in range(comet_length)] pos1 = 0 pos2 = 96//4 while True: evens.paste(comet1, pos1, wrap=True, reverse=False, others=0) pos1 = (pos1 + 1) % len(evens) odds.paste(comet2, pos2, wrap=True, reverse=True, others=0) pos2 = (pos2 - 1) % len(odds) pixels.show() m = ticks_ms() if m % 2000 > 1000: time.sleep(.02) ```
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#pragma once
#include "py/obj.h"
#include "py/objarray.h"
typedef struct {
uint8_t r;
uint8_t g;
uint8_t b;
uint8_t w;
} pixelbuf_rgbw_t;
typedef struct {
uint8_t bpp;
pixelbuf_rgbw_t byteorder;
bool has_white;
bool is_dotstar;
mp_obj_t order_string;
} pixelbuf_byteorder_details_t;
typedef struct {
mp_obj_base_t base;
size_t pixel_count;
uint16_t bytes_per_pixel;
uint16_t scaled_brightness;
pixelbuf_byteorder_details_t byteorder;
mp_float_t brightness;
mp_obj_t transmit_buffer_obj;
// The post_brightness_buffer is offset into the buffer allocated in transmit_buffer_obj to
// account for any header.
uint8_t *post_brightness_buffer;
uint8_t *pre_brightness_buffer;
bool auto_write;
} pixelbuf_pixelbuf_obj_t;
#define PIXEL_R 0
#define PIXEL_G 1
#define PIXEL_B 2
#define PIXEL_W 3
#define DOTSTAR_LED_START 0b11100000
#define DOTSTAR_LED_START_FULL_BRIGHT 0xFF