LINUX下使用python操作fb0设置画屏

在LINUX下使用python操作fb0设备对帧缓冲设备进行画屏操作.

import os
font_16x8 = {
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	"!":[0x00,0x00,0x00,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x00,0x00,0x10,0x10,0x00,0x00],
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	"$":[0x00,0x00,0x08,0x3C,0x4A,0x4A,0x48,0x38,0x0C,0x0A,0x0A,0x4A,0x4A,0x3C,0x08,0x08],
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	"&":[0x00,0x00,0x00,0x30,0x48,0x48,0x48,0x50,0x6E,0xA4,0x94,0x98,0x89,0x76,0x00,0x00],
	"'":[0x00,0x60,0x20,0x20,0x40,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
	"(":[0x00,0x02,0x04,0x08,0x08,0x10,0x10,0x10,0x10,0x10,0x10,0x08,0x08,0x04,0x02,0x00],
	")":[0x00,0x40,0x20,0x10,0x10,0x08,0x08,0x08,0x08,0x08,0x08,0x10,0x10,0x20,0x40,0x00],
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	",":[0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x60,0x20,0x20,0x40],
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	"y":[0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xE7,0x42,0x24,0x24,0x18,0x18,0x10,0x10,0x60],
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	"|":[0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08],
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}
class Framebuffer:
    def __init__(self, device_path='/dev/fb0', width=320, height=240):
        self.device_path = device_path
        self.width = width
        self.height = height
        self.bits_per_pixel = 16
        self.bytes_per_pixel = self.bits_per_pixel // 8
        self.buffer = bytearray(self.width * self.height * self.bytes_per_pixel)
        self.components = []
    def rgb888_to_rgb565(self, r, g, b):
        r = r >> 3
        g = g >> 2
        b = b >> 3
        return (r << 11) | (g << 5) | b
    def get_index(self, x, y):
        return (y * self.width + x) * self.bytes_per_pixel
    def set_pixel(self, x, y, r, g, b):
        if 0 <= x < self.width and 0 <= y < self.height:
            index = self.get_index(x, y)
            pixel_value = self.rgb888_to_rgb565(r, g, b)
            low_byte = pixel_value & 0xFF
            high_byte = (pixel_value >> 8) & 0xFF
            self.buffer[index] = low_byte
            self.buffer[index + 1] = high_byte
    def fill_rect(self, x, y, width, height, r, g, b):
        for i in range(y, y + height):
            for j in range(x, x + width):
                self.set_pixel(j, i, r, g, b)
    def draw_rect(self, x, y, width, height, r, g, b):
        for i in range(x, x + width):
            self.set_pixel(i, y, r, g, b)
        for i in range(x, x + width):
            self.set_pixel(i, y + height - 1, r, g, b)
        for i in range(y, y + height):
            self.set_pixel(x, i, r, g, b)
        for i in range(y, y + height):
            self.set_pixel(x + width - 1, i, r, g, b)
    def draw_text(self, x, y, text, r, g, b):
        for char in text:
            if char in font_16x8:
                char_data = font_16x8[char]
                for byte_index, byte in enumerate(char_data):
                    for bit_index in range(8):
                        if (byte << bit_index) & 0x80:
                            self.set_pixel(x + bit_index, y + byte_index, r, g, b)
            x += 8
    def clear_screen(self, r=0, g=0, b=0):
        self.fill_rect(0, 0, self.width, self.height, r, g, b)
    def add_component(self, component):
        self.components.append(component)
    def draw_components(self):
        for component in self.components:
            component.draw(self)
    def flush(self):
        try:
            with open(self.device_path, 'wb') as fb:
                fb.write(self.buffer)
        except PermissionError:
            print("Permission denied. Please run the script with sudo.")
        except Exception as e:
            print(f"Error operating the framebuffer device: {e}")
class GUIComponent:
    def __init__(self, x, y, width, height):
        self.x = x
        self.y = y
        self.width = width
        self.height = height
    def draw(self, fb):
        pass
class Label(GUIComponent):
    def __init__(self, x, y, text, text_color):
        super().__init__(x, y, len(text) * 8, 16)
        self.text = text
        self.text_color = text_color
    def draw(self, fb):
        r, g, b = self.text_color
        fb.draw_text(self.x, self.y, self.text, r, g, b)
class Button(GUIComponent):
    def __init__(self, x, y, width, height, text, bg_color, text_color, callback=None):
        super().__init__(x, y, width, height)
        self.text = text
        self.bg_color = bg_color
        self.text_color = text_color
        self.callback = callback
    def draw(self, fb):
        r, g, b = self.bg_color
        fb.fill_rect(self.x, self.y, self.width, self.height, r, g, b)
        r, g, b = self.text_color
        text_x = self.x + (self.width - len(self.text) * 8) // 2
        text_y = self.y + (self.height - 16) // 2
        fb.draw_text(text_x, text_y, self.text, r, g, b)
    def click(self):
        if self.callback:
            self.callback()
class SelectBox(GUIComponent):
    def __init__(self, x, y, width, height, options, selected_index=0):
        super().__init__(x, y, width, height)
        self.options = options
        self.selected_index = selected_index
    def draw(self, fb):
        fb.draw_rect(self.x, self.y, self.width, self.height, 255, 255, 255)
        selected_option = self.options[self.selected_index]
        text_x = self.x + 5
        text_y = self.y + (self.height - 16) // 2
        fb.draw_text(text_x, text_y, selected_option, 255, 255, 255)
    def select_next(self):
        self.selected_index = (self.selected_index + 1) % len(self.options)
    def select_prev(self):
        self.selected_index = (self.selected_index - 1) % len(self.options)
class InputBox(GUIComponent):
    def __init__(self, x, y, width, height, text="", max_length=10):
        super().__init__(x, y, width, height)
        self.text = text
        self.max_length = max_length
    def draw(self, fb):
        fb.draw_rect(self.x, self.y, self.width, self.height, 255, 255, 255)
        text_x = self.x + 5
        text_y = self.y + (self.height - 16) // 2
        fb.draw_text(text_x, text_y, self.text, 255, 255, 255)
    def add_char(self, char):
        if len(self.text) < self.max_length:
            self.text += char
    def remove_char(self):
        if self.text:
            self.text = self.text[:-1]
if __name__ == "__main__":
    fb = Framebuffer()
    fb.clear_screen()
    label = Label(10, 10, "Hello, GUI!", (255, 255, 255))
    button = Button(50, 50, 100, 30, "Click me", (255, 0, 0), (255, 255, 255))
    select_box = SelectBox(50, 100, 100, 30, ["Option 1", "Option 2", "Option 3"])
    input_box = InputBox(50, 150, 150, 30)
    fb.add_component(label)
    fb.add_component(button)
    fb.add_component(select_box)
    fb.add_component(input_box)
    fb.draw_components()
    fb.flush()

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