PNG文件输出[发布预备]

小传子 · 发表于 2008-6-14 05:05:10

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#==============================================================================
# PNG文件输出
# 用法：bitmap.save2png(filename)
# BY:轮回者
#==============================================================================
class Bitmap
# 是否自动颠倒上下？
# false时输出图像上下会颠倒,但并不能节省很多时间
SWITCH_UP2DOWN = true
# 存入PNG文件
def save2png(filename)
file = File.open(filename,"wb")
file.write(make_png_header)
file.write(make_png_ihdr)
file.write(make_png_idat)
file.write(make_png_iend)
file.close
end
# PNG文件头数据块
def make_png_header
return [0x89,0x50,0x4e,0x47,0x0d,0x0a,0x1a,0x0a].pack("C*")
end
# PNG文件情报头数据块(IHDR)
def make_png_ihdr
ih_size = [13].pack("N")
ih_sign = "IHDR"
ih_width = [width].pack("N")
ih_height = [height].pack("N")
ih_bit_depth = [8].pack("C")
ih_color_type = [6].pack("C")
ih_compression_method = [0].pack("C")
ih_filter_method = [0].pack("C")
ih_interlace_method = [0].pack("C")
string = ih_sign + ih_width + ih_height + ih_bit_depth + ih_color_type +
ih_compression_method + ih_filter_method + ih_interlace_method
ih_crc = [Zlib.crc32(string)].pack("N")
return ih_size + string + ih_crc
end
# PNG图像数据(IDAT)
def make_png_idat
header = "\x49\x44\x41\x54"
data = SWITCH_UP2DOWN ? make_png_data : make_png_data2
data = Zlib::Deflate.deflate(data, 8)
crc = [Zlib.crc32(header + data)].pack("N")
size = [data.length].pack("N")
return size + header + data + crc
end
# PNG图像数据(点阵);自动颠倒上下
def make_png_data
data = get_data.unpack('x2aX2aX2ax2a'*height*width).to_s
len = width * 4
for y in 0...height
break if 2*y >= height - 1
nth1 = y * len
nth2 = (height - 1 - y) * len
tStr = data[nth1,len]
data[nth1, len] = data[nth2, len]
data[nth2, len] = tStr
end
for y in 0...height
nth = (height - 1 - y) * width * 4
data.insert(nth,"\000")
end
return data
end
# PNG图像数据(点阵);不自动颠倒上下
def make_png_data2
data = get_data.unpack('x2aX2aX2ax2a'*height*width).to_s
for y in 0...height
nth = (height - 1 - y) * width * 4
data.insert(nth,"\000")
end
return data
end
# PNG文件尾数据块(IEND)
def make_png_iend
ie_size = [0].pack("N")
ie_sign = "IEND"
ie_crc = [Zlib.crc32(ie_sign)].pack("N")
return ie_size + ie_sign + ie_crc
end
# 获取数据
def get_data
data = "rgba" * width * height
RtlMoveMemory_pi.call(data, address, data.length)
return data
end
end
#==============================================================================
# Bitmap类修改尝试
#==============================================================================
class Bitmap
# 取得点（x，y）的颜色(Color)
def get_pixel_plus(x, y)
data = "rgba"
nth = ((height - 1 - y) * width + x) * data.length
RtlMoveMemory_pi.call(data, address + nth, data.length)
clr_ary = data.unpack('c*')
return Color.new(clr_ary[2],clr_ary[1],clr_ary[0],clr_ary[3])
end
# 设定点（x，y）的颜色为 color(Color)
def set_pixel_plus(x, y, color)
data = [color.blue,color.green,color.red,color.alpha].pack('c*')
nth = ((height - 1 - y) * width + x) * data.length
RtlMoveMemory_ip.call(address + nth, data, data.length)
return self
end
end
#==============================================================================
# 快速存储Bitmap的Marshal（修改版）By 柳之一
#==============================================================================
class Font
def marshal_dump;end
def marshal_load(obj);end
end
class Bitmap
attr_accessor :address
# 初始化传送到内存的API函数
RtlMoveMemory_pi = Win32API.new('kernel32', 'RtlMoveMemory', 'pii', 'i')
RtlMoveMemory_ip = Win32API.new('kernel32', 'RtlMoveMemory', 'ipi', 'i')
# 保存
def _dump(limit)
data = "rgba" * width * height
RtlMoveMemory_pi.call(data, address, data.length)
[width, height, Zlib::Deflate.deflate(data)].pack("LLa*") # 压缩
end
# 读取
def self._load(str)
w, h, zdata = str.unpack("LLa*"); b = new(w, h)
RtlMoveMemory_ip.call(b.address, Zlib::Inflate.inflate(zdata), w * h * 4); b
end
# [[[bitmap.object_id * 2 + 16] + 8] + 16] == 数据的开头
#
def address
@address = ini_address if @address.nil?
return @address
end
def ini_address
buffer, ad = "xxxx", object_id * 2 + 16
RtlMoveMemory_pi.call(buffer, ad, 4); ad = buffer.unpack("L")[0] + 8
RtlMoveMemory_pi.call(buffer, ad, 4); ad = buffer.unpack("L")[0] + 16
RtlMoveMemory_pi.call(buffer, ad, 4); ad = buffer.unpack("L")[0]
return ad
end
end
#==============================================================================
# 回收站～
#==============================================================================
=begin
class Color_Plus
# 初始化实例变量
attr_accessor :red
attr_accessor :green
attr_accessor :blue
attr_accessor :alpha
# 初始化
def initialize(red, green, blue, alpha=255)
@red = red
@green = green
@blue = blue
@alpha = alpha
end
# 设定所有属性
def set(red, green, blue, alpha=255)
@red = red
@green = green
@blue = blue
@alpha = alpha
end
end
=end

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用到了某柳的东西,感觉轮子这个还是不错的{/hx}

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