jessikitty/mikunyan
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

DXTC Native Decoding Support

Browse Source
This commit is contained in:
Ishotihadus
2018-05-27 02:45:23 +09:00
parent 4b577b0644
commit a7f748bbb5
5 changed files with 139 additions and 112 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/mikunyan/decoders/dxtc_block_decoder.rb
-89
View File
@@ -1,89 +0,0 @@
require 'bin_utils'
require 'fiddle'
module Mikunyan
module DecodeHelper
# Module for decoding DXTC block
module DxtcBlockDecoder
def self.decode_dxt1_block(bin)
c0 = BinUtils.get_int16_le(bin, 0)
c1 = BinUtils.get_int16_le(bin, 2)
color = [get_rgb565a(c0), get_rgb565a(c1), nil, nil]
if c0 > c1
color[2] = [(color[0][0] * 2 + color[1][0]) / 3, (color[0][1] * 2 + color[1][1]) / 3, (color[0][2] * 2 + color[1][2]) / 3, 255]
color[3] = [(color[0][0] + color[1][0] * 2) / 3, (color[0][1] + color[1][1] * 2) / 3, (color[0][2] + color[1][2] * 2) / 3, 255]
else
color[2] = [(color[0][0] + color[1][0]) / 2, (color[0][1] + color[1][1]) / 2, (color[0][2] + color[1][2]) / 2, 255]
color[3] = [0, 0, 0, 0]
end
color.map!{|e| e.pack('C4')}
code = BinUtils.get_int32_le(bin, 4)
mem = String.new(capacity: 64)
16.times do
mem << color[code & 3]
code >>= 2
end
mem
end
def self.decode_dxt5_block(bin)
alpha_list, alpha_code = decode_dxt5_alpha(bin)
color_list, color_code = decode_dxtc_rgb(bin)
mem = String.new(capacity: 64)
16.times do
mem << color_list[color_code & 3]
mem << alpha_list[alpha_code & 7]
color_code >>= 2
alpha_code >>= 3
end
mem
end
def self.decode_dxtc_rgb(bin)
c0 = BinUtils.get_int16_le(bin, 8)
c1 = BinUtils.get_int16_le(bin, 10)
color = [get_rgb565(c0), get_rgb565(c1), nil, nil]
if c0 > c1
color[2] = (0...3).map{|i| (color[0][i] * 2 + color[1][i]) / 3}
color[3] = (0...3).map{|i| (color[0][i] + color[1][i] * 2) / 3}
else
color[2] = (0...3).map{|i| (color[0][i] + color[1][i]) / 2}
color[3] = [0, 0, 0]
end
color.map!{|e| e.pack('C3')}
code = BinUtils.get_int32_le(bin, 12)
[color, code]
end
def self.decode_dxt5_alpha(bin)
a0 = BinUtils.get_int8(bin, 0)
a1 = BinUtils.get_int8(bin, 1)
alpha = [a0, a1, nil, nil, nil, nil, nil, nil]
if a0 > a1
alpha[2, 6] = (1..6).map{|n| (a0 * (7-n) + a1 * n) / 7}
else
alpha[2, 4] = (1..4).map{|n| (a0 * (5-n) + a1 * n) / 5}
alpha[6] = 0
alpha[7] = 255
end
alpha.pack('C8')
code = BinUtils.get_int64_le(bin) >> 16
[alpha, code]
end
def self.get_rgb565(c)
r = (c & 0xf800) >> 8
g = (c & 0x07e0) >> 3
b = (c & 0x001f) << 3
[r | r >> 5, g | g >> 6, b | b >> 5]
end
def self.get_rgb565a(c)
r = (c & 0xf800) >> 8
g = (c & 0x07e0) >> 3
b = (c & 0x001f) << 3
[r | r >> 5, g | g >> 6, b | b >> 5, 255]
end
end
end
end
lib/mikunyan/decoders/image_decoder.rb
+2 -21
View File
@@ -1,7 +1,6 @@
begin; require 'oily_png'; rescue LoadError; require 'chunky_png'; end
require 'bin_utils'
require 'mikunyan/decoders/native'
require 'mikunyan/decoders/dxtc_block_decoder'
module Mikunyan
# Class for image decoding tools
@@ -353,16 +352,7 @@ module Mikunyan
# @param [String] bin binary to decode
# @return [ChunkyPNG::Image] decoded image
def self.decode_dxt1(width, height, bin)
bw = (width + 3) / 4
bh = (height + 3) / 4
ret = ChunkyPNG::Image.new(bh * 4, bw * 4)
bh.times do |by|
bw.times do |bx|
block = DecodeHelper::DxtcBlockDecoder::decode_dxt1_block(bin.byteslice((bx + by * bw) * 8, 8))
ret.replace!(ChunkyPNG::Image.from_rgba_stream(4, 4, block), bx * 4, by * 4)
end
end
ret.crop(0, 0, height, width).flip
ChunkyPNG::Image.from_rgba_stream(width, height, DecodeHelper.decode_dxt1(bin, width, height))
end
# Decode image from DXT5 compressed binary
@@ -371,16 +361,7 @@ module Mikunyan
# @param [String] bin binary to decode
# @return [ChunkyPNG::Image] decoded image
def self.decode_dxt5(width, height, bin)
bw = (width + 3) / 4
bh = (height + 3) / 4
ret = ChunkyPNG::Image.new(bh * 4, bw * 4)
bh.times do |by|
bw.times do |bx|
block = DecodeHelper::DxtcBlockDecoder::decode_dxt5_block(bin.byteslice((bx + by * bw) * 16, 16))
ret.replace!(ChunkyPNG::Image.from_rgba_stream(4, 4, block), bx * 4, by * 4)
end
end
ret.crop(0, 0, height, width).flip
ChunkyPNG::Image.from_rgba_stream(width, height, DecodeHelper.decode_dxt5(bin, width, height))
end
# Decode image from ETC1 compressed binary