122 lines
4.1 KiB
Haxe
122 lines
4.1 KiB
Haxe
/*
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* format - Haxe File Formats
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*
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* BMP File Format
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* Copyright (C) 2007-2009 Robert Sköld
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*
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* Copyright (c) 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 iron.format.bmp;
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import iron.format.bmp.Data;
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class Reader {
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var input : haxe.io.Input;
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public function new( i ) {
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input = i;
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}
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/**
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* Only supports uncompressed 24bpp bitmaps (the most common format).
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*
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* The returned bytes in `Data.pixels` will be in BGR order, and with padding (if present).
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*
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* @see https://msdn.microsoft.com/en-us/library/windows/desktop/dd318229(v=vs.85).aspx
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* @see https://en.wikipedia.org/wiki/BMP_file_format#Bitmap_file_header
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*/
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public function read() : format.bmp.Data {
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// Read Header
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for (b in ["B".code, "M".code]) {
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if (input.readByte() != b) throw "Invalid header";
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}
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var fileSize = input.readInt32();
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input.readInt32(); // Reserved
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var offset = input.readInt32();
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// Read InfoHeader
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var infoHeaderSize = input.readInt32(); // InfoHeader size
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if (infoHeaderSize != 40) {
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throw 'Info headers with size $infoHeaderSize not supported.';
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}
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var width = input.readInt32(); // Image width (actual, not padded)
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var height = input.readInt32(); // Image height
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var numPlanes = input.readInt16(); // Number of planes
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var bits = input.readInt16(); // Bits per pixel
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var compression = input.readInt32(); // Compression type
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var dataLength = input.readInt32(); // Image data size (includes padding!)
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input.readInt32(); // Horizontal resolution
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input.readInt32(); // Vertical resolution
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var colorsUsed = input.readInt32(); // Colors used (0 when uncompressed)
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input.readInt32(); // Important colors (0 when uncompressed)
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// If there's no compression, the dataLength may be 0
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if ( compression == 0 && dataLength == 0 ) dataLength = fileSize - offset;
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var bytesRead = 54; // total read above
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var colorTable : haxe.io.Bytes = null;
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if ( bits <= 8 ) {
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if ( colorsUsed == 0 ) {
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colorsUsed = Tools.getNumColorsForBitDepth(bits);
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}
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var colorTableLength = 4 * colorsUsed;
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colorTable = haxe.io.Bytes.alloc( colorTableLength );
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input.readFullBytes( colorTable, 0, colorTableLength );
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bytesRead += colorTableLength;
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}
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input.read( offset - bytesRead );
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var p = haxe.io.Bytes.alloc( dataLength );
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// Read Raster Data
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var paddedStride = Tools.computePaddedStride(width, bits);
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var topToBottom = false;
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if ( height < 0 ) { // if bitmap is stored top to bottom
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topToBottom = true;
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height = -height;
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}
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input.readFullBytes(p, 0, dataLength);
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return {
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header: {
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width: width,
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height: height,
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paddedStride: paddedStride,
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topToBottom: topToBottom,
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bpp: bits,
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dataLength: dataLength,
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compression: compression
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},
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pixels: p,
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colorTable: colorTable
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}
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}
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} |