【micropython】esp32 framebuf通过pixel的形式在墨水屏上展示中文

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前言

micropython使用framebuf库来实现中文展示

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一、hzk字库

不过多叙述，自行查找
资源的话，可以上网找，一找一大把

二、使用步骤

1.引入相应的驱动

可以使用墨水屏、oled，原则上，使用framebuf这个的都可以

使用的是CircuitPython下的framebuf库，可以旋转，比较方便
cframebuf库如下

cframebuf.py

// An highlighted block
# SPDX-FileCopyrightText: <text> 2018 Kattni Rembor, Melissa LeBlanc-Williams
# and Tony DiCola, for Adafruit Industries.
# Original file created by Damien P. George </text>
#
# SPDX-License-Identifier: MIT

"""
`adafruit_framebuf`
====================================================
CircuitPython pure-python framebuf module, based on the micropython framebuf module.
Implementation Notes
--------------------
**Hardware:**
* `Adafruit SSD1306 OLED displays <https://www.adafruit.com/?q=ssd1306>`_
**Software and Dependencies:**
* Adafruit CircuitPython firmware for the supported boards:
  https://github.com/adafruit/circuitpython/releases
"""

__version__ = "0.0.0-auto.0"
__repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_framebuf.git"

import os
import struct

# Framebuf format constants:
MVLSB = 0  # Single bit displays (like SSD1306 OLED)
RGB565 = 1  # 16-bit color displays
GS4_HMSB = 2  # Unimplemented!
MHMSB = 3  # Single bit displays like the Sharp Memory
RGB888 = 4  # Neopixels and Dotstars


class MHMSBFormat:
    """MHMSBFormat"""

    @staticmethod
    def set_pixel(framebuf, x, y, color):
        """Set a given pixel to a color."""
        index = (y * framebuf.stride + x) // 8
        offset = 7 - x & 0x07
        framebuf.buf[index] = (framebuf.buf[index] & ~(0x01 << offset)) | (
                (color != 0) << offset
        )

    @staticmethod
    def get_pixel(framebuf, x, y):
        """Get the color of a given pixel"""
        index = (y * framebuf.stride + x) // 8
        offset = 7 - x & 0x07
        return (framebuf.buf[index] >> offset) & 0x01

    @staticmethod
    def fill(framebuf, color):
        """completely fill/clear the buffer with a color"""
        if color:
            fill = 0xFF
        else:
            fill = 0x00
        for i in range(len(framebuf.buf)):  # pylint: disable=consider-using-enumerate
            framebuf.buf[i] = fill

    @staticmethod
    def fill_rect(framebuf, x, y, width, height, color):
        """Draw a rectangle at the given location, size and color. The ``fill_rect`` method draws
        both the outline and interior."""
        # pylint: disable=too-many-arguments
        for _x in range(x, x + width):
            offset = 7 - _x & 0x07
            for _y in range(y, y + height):
                index = (_y * framebuf.stride + _x) // 8
                framebuf.buf[index] = (framebuf.buf[index] & ~(0x01 << offset)) | (
                        (color != 0) << offset
                )


class MVLSBFormat:
    """MVLSBFormat"""

    @staticmethod
    def set_pixel(framebuf, x, y, color):
        """Set a given pixel to a color."""
        index = (y >> 3) * framebuf.stride + x
        offset = y & 0x07
        framebuf.buf[index] = (framebuf.buf[index] & ~(0x01 << offset)) | (
                (color != 0) << offset
        )

    @staticmethod
    def get_pixel(framebuf, x, y):
        """Get the color of a given pixel"""
        index = (y >> 3) * framebuf.stride + x
        offset = y & 0x07
        return (framebuf.buf[index] >> offset) & 0x01

    @staticmethod
    def fill(framebuf, color):
        """completely fill/clear the buffer with a color"""
        if color:
            fill = 0xFF
        else:
            fill = 0x00
        for i in range(len(framebuf.buf)):  # pylint: disable=consider-using-enumerate
            framebuf.buf[i] = fill

    @staticmethod
    def fill_rect(framebuf, x, y, width, height, color):
        """Draw a rectangle at the given location, size and color. The ``fill_rect`` method draws
        both the outline and interior."""
        # pylint: disable=too-many-arguments
        while height > 0:
            index = (y >> 3) * framebuf.stride + x
            offset = y & 0x07
            for w_w in range(width):
                framebuf.buf[index + w_w] = (
                                                    framebuf.buf[index + w_w] & ~(0x01 << offset)
                                            ) | ((color != 0) << offset)
            y += 1
            height -= 1


class RGB888Format:
    """RGB888Format"""

    @staticmethod
    def set_pixel(framebuf, x, y, color):
        """Set a given pixel to a color."""
        index = (y * framebuf.stride + x) * 3
        if isinstance(color, tuple):
            framebuf.buf[index: index + 3] = bytes(color)
        else:
            framebuf.buf[index: index + 3] = bytes(
                ((color >> 16) & 255, (color >> 8) & 255, color & 255)
            )

    @staticmethod
    def get_pixel(framebuf, x, y):
        """Get the color of a given pixel"""
        index = (y * framebuf.stride + x) * 3
        return (
                (framebuf.buf[index] << 16)
                | (framebuf.buf[index + 1] << 8)
                | framebuf.buf[index + 2]
        )

    @staticmethod
    def fill(framebuf, color):
        """completely fill/clear the buffer with a color"""
        fill = (color >> 16) & 255, (color >> 8) & 255, color & 255
        for i in range(0, len(framebuf.buf), 3):
            framebuf.buf[i: i + 3] = bytes(fill)

    @staticmethod
    def fill_rect(framebuf, x, y, width, height, color):
        """Draw a rectangle at the given location, size and color. The ``fill_rect`` method draws
        both the outline and interior."""
        # pylint: disable=too-many-arguments
        fill = (color >> 16) & 255, (color >> 8) & 255, color & 255
        for _x in range(x, x + width):
            for _y in range(y, y + height):
                index = (_y * framebuf.stride + _x) * 3
                framebuf.buf[index: index + 3] = bytes(fill)


class FrameBuffer:
    """FrameBuffer object.
    :param buf: An object with a buffer protocol which must be large enough to contain every
                pixel defined by the width, height and format of the FrameBuffer.
    :param width: The width of the FrameBuffer in pixel
    :param height: The height of the FrameBuffer in pixel
    :param buf_format: Specifies the type of pixel used in the FrameBuffer; permissible values
                        are listed under Constants below. These set the number of bits used to
                        encode a color value and the layout of these bits in ``buf``. Where a
                        color value c is passed to a method, c is  a small integer with an encoding
                        that is dependent on the format of the FrameBuffer.
    :param stride: The number of pixels between each horizontal line of pixels in the
                   FrameBuffer. This defaults to ``width`` but may need adjustments when
                   implementing a FrameBuffer within another larger FrameBuffer or screen. The
                   ``buf`` size must accommodate an increased step size.
    """

    def __init__(self, buf, width, height, buf_format=MVLSB, stride=None):
        # pylint: disable=too-many-arguments
        self.buf = buf
        self.width = width
        self.height = height
        self.stride = stride
        self._font = None
        if self.stride is None:
            self.stride = width
        if buf_format == MVLSB:
            self.format = MVLSBFormat()
        elif buf_format == MHMSB: