luboslenco
83 lines
2.6 KiB
Haxe
83 lines
2.6 KiB
Haxe
/*
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* format - haXe File Formats
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*
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* Copyright (c) 2008-2009, The haXe Project Contributors
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* All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE HAXE PROJECT CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE HAXE PROJECT CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*/
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package arm.format;
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import arm.format.PngData;
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class PngWriter {
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var o : haxe.io.Output;
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public function new(o) {
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this.o = o;
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o.bigEndian = true;
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}
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public function write( png : PngData ) {
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for( b in [137,80,78,71,13,10,26,10] )
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o.writeByte(b);
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for( c in png )
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switch( c ) {
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case CHeader(h):
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var b = new haxe.io.BytesOutput();
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b.bigEndian = true;
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b.writeInt32(h.width);
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b.writeInt32(h.height);
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b.writeByte(h.colbits);
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b.writeByte(switch( h.color ) {
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case ColGrey(alpha): alpha ? 4 : 0;
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case ColTrue(alpha): alpha ? 6 : 2;
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case ColIndexed: 3;
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});
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b.writeByte(0);
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b.writeByte(0);
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b.writeByte(h.interlaced ? 1 : 0);
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writeChunk("IHDR",b.getBytes());
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case CEnd:
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writeChunk("IEND",haxe.io.Bytes.alloc(0));
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case CData(d):
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writeChunk("IDAT",d);
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case CPalette(b):
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writeChunk("PLTE",b);
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case CUnknown(id,data):
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writeChunk(id,data);
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}
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}
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function writeChunk( id : String, data : haxe.io.Bytes ) {
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o.writeInt32(data.length);
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o.writeString(id);
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o.write(data);
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// compute CRC
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var crc = new haxe.crypto.Crc32();
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for( i in 0...4 )
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crc.byte(id.charCodeAt(i));
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crc.update(data, 0, data.length);
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o.writeInt32(crc.get());
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}
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}
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