Python实现生成bmp图像的方法

之前使用过c、java、go语言实现过生成纯色bmp图片的功能。

现在由python语言完成该功能。

from array import array

class bmp:
    """ bmp data structure """

    def __init__(self, w=1080, h=1920, color = 0xffffff):
        self.w = w
        self.h = h
        self.gen_bmp_header()
        self.paint_bgcolor(color)

    def calc_data_size (self):
        if((self.w*3)%4 == 0):
            self.datasize = self.w * 3 * self.h
        else:
            self.datasize = (((self.w * 3) // 4 + 1) * 4) * self.h

        self.filesize = self.datasize + 54

    def conv2byte(self, l, num, len):
        tmp = num
        for i in range(len):
            l.append(tmp & 0x000000ff)
            tmp >>= 8

    def gen_bmp_header (self):
        self.calc_data_size();
        self.bmp_header = [0x42, 0x4d]
        self.conv2byte(self.bmp_header, self.filesize, 4) #file size
        self.conv2byte(self.bmp_header, 0, 2)
        self.conv2byte(self.bmp_header, 0, 2)
        self.conv2byte(self.bmp_header, 54, 4) #rgb data offset
        self.conv2byte(self.bmp_header, 40, 4) #info block size
        self.conv2byte(self.bmp_header, self.w, 4)
        self.conv2byte(self.bmp_header, self.h, 4)
        self.conv2byte(self.bmp_header, 1, 2)
        self.conv2byte(self.bmp_header, 24, 2) #888
        self.conv2byte(self.bmp_header, 0, 4)  #no compression
        self.conv2byte(self.bmp_header, self.datasize, 4) #rgb data size
        self.conv2byte(self.bmp_header, 0, 4)
        self.conv2byte(self.bmp_header, 0, 4)
        self.conv2byte(self.bmp_header, 0, 4)
        self.conv2byte(self.bmp_header, 0, 4)

    def print_bmp_header (self):
        length = len(self.bmp_header)
        for i in range(length):
            print("{:0>2x}".format(self.bmp_header[i]), end=' ')
            if i%16 == 15:
                print('')
        print('')

    def paint_bgcolor(self, color=0xffffff):
        self.rgbdata = []
        for r in range(self.h):
            self.rgbdatarow = []
            for c in range(self.w):
                self.rgbdatarow.append(color)
            self.rgbdata.append(self.rgbdatarow)

    def paint_line(self, x1, y1, x2, y2, color):
        k = (y2 - y1) / (x2 - x1)
        for x in range(x1, x2+1):
            y = int(k * (x - x1) + y1)
            self.rgbdata[y][x] = color

    def paint_rect(self, x1, y1, w, h, color):
        for x in range(x1, x1+w):
            for y in range(y1, y1+h):
                self.rgbdata[y][x] = color

    def paint_point(self, x, y, color=0x000000):
        self.rgbdata[y][x] = color

    def save_image(self, name="save.bmp"):
        f = open(name, 'wb')

        #write bmp header
        f.write(array('b', self.bmp_header).tobytes())

        #write rgb data
        zerobytes = self.datasize // self.h - self.w * 3

        for r in range(self.h):
            l = []
            for i in range(len(self.rgbdata[r])):
                p = self.rgbdata[r][i]
                l.append(p & 0x0000ff)
                p >>= 8
                l.append(p & 0x0000ff)
                p >>= 8
                l.append(p & 0x0000ff)

            f.write(array('b', l).tobytes())

            for i in range(zerobytes):
                f.write(bytes([0x00]))

        #close file
        f.close()

if __name__ == '__main__':


    image = bmp(35, 35)

    for i in range(35):
        image.paint_point(i, i, 0xff0000)

    image.save_image("save1.bmp")
    import os
    os.system("save1.bmp")

到此这篇关于python实现生成bmp图像的方法的文章就介绍到这了,更多相关python生成bmp图像内容请搜索以前的文章或继续浏览下面的相关文章希望大家以后多多支持！