71 lines
2.1 KiB
Haxe
71 lines
2.1 KiB
Haxe
package;
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import kiss.ByteStream;
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import flash.display.BitmapData;
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import flixel.util.FlxColor;
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class Bmp {
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static function checkHeader(bytes:ByteStream) {
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// 42 4D
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if (bytes.readByte() != 66 || bytes.readByte() != 77)
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throw 'Bad bmp header!';
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}
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public static function loadBitmapData(bmpFile:String) {
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var stream = ByteStream.fromFile(bmpFile);
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checkHeader(stream);
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var fileSize = stream.readUInt32();
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var fileReserved = stream.readUInt32();
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var fileOffBits = stream.readUInt32();
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var imgSize = stream.readUInt32();
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var imgWidth = stream.readInt32();
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var imgHeight = stream.readInt32();
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var planes = stream.readUInt16();
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var bitsPerPixel = stream.readUInt16();
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var compression = stream.readUInt32();
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var sizeImage = stream.readUInt32();
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var xPixelsPerMeter = stream.readInt32();
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var yPixelsPerMeter = stream.readInt32();
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var colorsUsed = stream.readUInt32();
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var colorsImportant = stream.readUInt32();
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var colors:Array<FlxColor> = [];
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for (c in 0...colorsUsed) {
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var blue = stream.readByte();
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var green = stream.readByte();
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var red = stream.readByte();
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var _ = stream.readByte();
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colors.push(FlxColor.fromRGB(red, green, blue));
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}
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// BMPs can be encoded upside-down when the height is negative
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var realHeight:Int = cast Math.abs(imgHeight);
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var data = new BitmapData(imgWidth, realHeight);
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var y = if (imgHeight > 0) 0 else realHeight - 1;
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var dy = if (imgHeight > 0) 1 else -1;
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var rowPadding:Int = cast (sizeImage - (realHeight * imgWidth)) / realHeight;
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for (_ in 0... realHeight) {
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for (x in 0... imgWidth) {
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var colorIdx = stream.readByte();
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data.setPixel(x, realHeight-1-y, colors[colorIdx]);
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}
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for (_ in 0... rowPadding) {
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stream.readByte();
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}
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y += dy;
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}
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return data;
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}
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} |