t3du - New Image nodes: Draw Sub Image and Write Image

leenkx/Sources/iron/format/bmp/Reader.hx

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+/*
+ * format - Haxe File Formats
+ *
+ *  BMP File Format
+ *  Copyright (C) 2007-2009 Robert Sköld
+ *
+ * Copyright (c) 2009, The Haxe Project Contributors
+ * All rights reserved.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   - Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *   - Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE HAXE PROJECT CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE HAXE PROJECT CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ */
+
+package iron.format.bmp;
+
+import iron.format.bmp.Data;
+
+
+class Reader {
+
+	var input : haxe.io.Input;
+
+	public function new( i ) {
+		input = i;
+	}
+
+	/** 
+	 * Only supports uncompressed 24bpp bitmaps (the most common format).
+	 * 
+	 * The returned bytes in `Data.pixels` will be in BGR order, and with padding (if present).
+	 * 
+	 * @see https://msdn.microsoft.com/en-us/library/windows/desktop/dd318229(v=vs.85).aspx
+	 * @see https://en.wikipedia.org/wiki/BMP_file_format#Bitmap_file_header
+	 */
+	public function read() : format.bmp.Data {
+		// Read Header
+		for (b in ["B".code, "M".code]) {
+			if (input.readByte() != b) throw "Invalid header";
+		}
+	
+		var fileSize = input.readInt32();
+		input.readInt32();							// Reserved
+		var offset = input.readInt32();
+
+		// Read InfoHeader
+		var infoHeaderSize = input.readInt32();		// InfoHeader size
+		if (infoHeaderSize != 40) {
+			throw 'Info headers with size $infoHeaderSize not supported.';
+		}
+		var width = input.readInt32();				// Image width (actual, not padded)
+		var height = input.readInt32();				// Image height
+		var numPlanes = input.readInt16();			// Number of planes
+		var bits = input.readInt16();				// Bits per pixel
+		var compression = input.readInt32();		// Compression type
+		var dataLength = input.readInt32();			// Image data size (includes padding!)
+		input.readInt32();							// Horizontal resolution
+		input.readInt32();							// Vertical resolution
+		var colorsUsed = input.readInt32();			// Colors used (0 when uncompressed)
+		input.readInt32();							// Important colors (0 when uncompressed)
+
+		// If there's no compression, the dataLength may be 0
+		if ( compression == 0 && dataLength == 0 ) dataLength = fileSize - offset;
+
+		var bytesRead = 54; // total read above
+		
+		var colorTable : haxe.io.Bytes = null;
+		if ( bits <= 8 ) {
+			if ( colorsUsed == 0 ) {
+				colorsUsed = Tools.getNumColorsForBitDepth(bits);
+			}
+			var colorTableLength = 4 * colorsUsed;
+			colorTable = haxe.io.Bytes.alloc( colorTableLength );
+			input.readFullBytes( colorTable, 0, colorTableLength );
+			bytesRead += colorTableLength;
+		}
+
+		input.read( offset - bytesRead );
+		
+		var p = haxe.io.Bytes.alloc( dataLength );	
+		
+		// Read Raster Data
+		var paddedStride = Tools.computePaddedStride(width, bits);
+		var topToBottom = false;
+		if ( height < 0 ) { // if bitmap is stored top to bottom
+			topToBottom = true;
+			height = -height;
+		}
+    
+		input.readFullBytes(p, 0, dataLength);
+			
+		return {
+			header: {
+				width: width,
+				height: height,
+				paddedStride: paddedStride,
+				topToBottom: topToBottom,
+				bpp: bits,
+				dataLength: dataLength,
+				compression: compression
+			},
+			pixels: p,
+			colorTable: colorTable
+		}
+	}
+}