TGADecoder.as

リビジョン 233, 6.3 kB (コミッタ: rch850, コミット時期: 3 年前)
Supported parent-children relationship of .mqo file. Rewrote license notices (MIT). Interactivity (in progress).

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1	/**
2	* TGADecoder.as
3	*
4	* @see http://snippets.libspark.org/
5	* @see http://snippets.libspark.org/trac/wiki/rch850/Metasequoia
6	*
7	* Copyright (c) 2008 rch850
8	*
9	* Permission is hereby granted, free of charge, to any person obtaining a copy
10	* of this software and associated documentation files (the "Software"), to deal
11	* in the Software without restriction, including without limitation the rights
12	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
13	* copies of the Software, and to permit persons to whom the Software is
14	* furnished to do so, subject to the following conditions:
15	*
16	* The above copyright notice and this permission notice shall be included in
17	* all copies or substantial portions of the Software.
18	*
19	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
22	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
24	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
25	* THE SOFTWARE.
26	*/
27
28	package org.libspark.pv3d.decoders {
29	import flash.display.BitmapData;
30	import flash.utils.ByteArray;
31	import flash.utils.Endian;
32
33	public class TGADecoder {
34	//___________________________________________________________ const
35
36	// constant value for _imageType
37	private const TYPE_NONE:uint = 0x00;
38	private const TYPE_INDEX_COLOR:uint = 0x01;
39	private const TYPE_FULL_COLOR:uint = 0x02;
40	private const TYPE_RLE_BIT:uint = 0x08;
41
42	private const DIR_RIGHT_UP:int = 0;
43	private const DIR_LEFT_UP:int = 1;
44	private const DIR_RIGHT_DOWN:int = 2;
45	private const DIR_LEFT_DOWN:int = 3;
46
47	//___________________________________________________________ vars
48
49	private var _bitmap:BitmapData;
50	public function get bitmap():BitmapData {
51	return _bitmap;
52	}
53
54	private var _idLength:int; // byte
55	private var _colorMapType:int; // byte
56	private var _imageType:int; // byte
57	private var _colorMapIndex:int; // short
58	private var _colorMapLength:int; // short
59	private var _colorMapSize:int; // byte
60	private var _originX:int; // short
61	private var _originY:int; // short
62	private var _width:int; // short
63	public function get width():int {
64	return _width;
65	}
66	private var _height:int; // short
67	public function get height():int {
68	return _height;
69	}
70	private var _bitDepth:int; // byte
71	private var _descriptor:int; // byte
72	public function get pixelDirection():int {
73	// descriptor:
74	// 4th bit: 0 = left to right, 1 = right to left
75	// 5th bit: 0 = bottom up, 1 = top down
76	return (_descriptor >> 4) & 3;
77	}
78
79	/**
80	* Construct TGA file from ByteArray.
81	*/
82	public function TGADecoder(bytes:ByteArray) {
83	bytes.position = 0;
84	bytes.endian = Endian.LITTLE_ENDIAN;
85
86	_idLength = bytes.readByte();
87	_colorMapType = bytes.readByte();
88	_imageType = bytes.readByte();
89	_colorMapIndex = bytes.readShort();
90	_colorMapLength = bytes.readShort();
91	_colorMapSize = bytes.readByte()
92	_originX = bytes.readShort();
93	_originY = bytes.readShort();
94	_width = bytes.readShort();
95	_height = bytes.readShort();
96	_bitDepth = bytes.readByte();
97	_descriptor = bytes.readByte();
98
99	_bitmap = new BitmapData(_width, _height);
100
101	// ignore unsupported formats.
102	if ((_imageType & TYPE_FULL_COLOR) == 0
103	\|\| (_imageType & TYPE_RLE_BIT) != 0) {
104	throw new Error("Unsupported tga format.");
105	}
106
107	_bitmap.lock();
108	try {
109	if (_bitDepth == 32) {
110	loadBitmap32(bytes);
111	} else if (_bitDepth == 24) {
112	loadBitmap24(bytes);
113	}
114	} finally {
115	_bitmap.unlock();
116	}
117	}
118
119	/**
120	* Load 32 bpp bitmap.
121	*/
122	private function loadBitmap32(bytes:ByteArray):void {
123	var x:int, y:int;
124	switch (pixelDirection) {
125	case DIR_RIGHT_UP:
126	for (y = _bitmap.height - 1; y >= 0; --y) {
127	for (x = 0; x < _bitmap.width; ++x) {
128	_bitmap.setPixel32(x, y, bytes.readUnsignedInt());
129	}
130	}
131	break;
132	case DIR_LEFT_UP:
133	for (y = _bitmap.height - 1; y >= 0; --y) {
134	for (x = _bitmap.width - 1; x >= 0; --x) {
135	_bitmap.setPixel32(x, y, bytes.readUnsignedInt());
136	}
137	}
138	break;
139	case DIR_RIGHT_DOWN:
140	for (y = 0; y < _bitmap.height; ++y) {
141	for (x = 0; x < _bitmap.width; ++x) {
142	_bitmap.setPixel32(x, y, bytes.readUnsignedInt());
143	}
144	}
145	break;
146	case DIR_LEFT_DOWN:
147	for (y = 0; y < _bitmap.height; ++y) {
148	for (x = _bitmap.width - 1; x >= 0; --x) {
149	_bitmap.setPixel32(x, y, bytes.readUnsignedInt());
150	}
151	}
152	break;
153	}
154	}
155
156	/**
157	* Load 24 bpp bitmap.
158	*/
159	private function loadBitmap24(bytes:ByteArray):void {
160	var x:int, y:int;
161	var r:uint, g:uint, b:uint;
162	switch (pixelDirection) {
163	case DIR_RIGHT_UP:
164	for (y = _bitmap.height - 1; y >= 0; --y) {
165	for (x = 0; x < _bitmap.width; ++x) {
166	b = bytes.readUnsignedByte();
167	g = bytes.readUnsignedByte();
168	r = bytes.readUnsignedByte();
169	_bitmap.setPixel32(x, y, 0xFF000000 \| (r << 16) \| (g << 8) \| b);
170	}
171	}
172	break;
173	case DIR_LEFT_UP:
174	for (y = _bitmap.height - 1; y >= 0; --y) {
175	for (x = _bitmap.width - 1; x >= 0; --x) {
176	b = bytes.readUnsignedByte();
177	g = bytes.readUnsignedByte();
178	r = bytes.readUnsignedByte();
179	_bitmap.setPixel32(x, y, 0xFF000000 \| (r << 16) \| (g << 8) \| b);
180	}
181	}
182	break;
183	case DIR_RIGHT_DOWN:
184	for (y = 0; y < _bitmap.height; ++y) {
185	for (x = 0; x < _bitmap.width; ++x) {
186	b = bytes.readUnsignedByte();
187	g = bytes.readUnsignedByte();
188	r = bytes.readUnsignedByte();
189	_bitmap.setPixel32(x, y, 0xFF000000 \| (r << 16) \| (g << 8) \| b);
190	}
191	}
192	break;
193	case DIR_LEFT_DOWN:
194	for (y = 0; y < _bitmap.height; ++y) {
195	for (x = _bitmap.width - 1; x >= 0; --x) {
196	b = bytes.readUnsignedByte();
197	g = bytes.readUnsignedByte();
198	r = bytes.readUnsignedByte();
199	_bitmap.setPixel32(x, y, 0xFF000000 \| (r << 16) \| (g << 8) \| b);
200	}
201	}
202	break;
203	}
204	}
205	}
206	}

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root/as3/Metasequoia/src/org/libspark/pv3d/decoders/TGADecoder.as

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