Remove dependency to Image

@@ -16,8 +16,6 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
-library pdf;
-
 /// http://www.mactech.com/articles/mactech/Vol.15/15.09/PDFIntro/index.html
 /// https://brendanzagaeski.appspot.com/0004.html
 /// http://blog.idrsolutions.com/?s=%22Make+your+own+PDF+file%22
@@ -29,15 +27,19 @@ library pdf;
 /// https://www.w3.org/TR/SVG/paths.html#PathDataGeneralInformation
 /// https://www.pdf-online.com/osa/validate.aspx
 
+library pdf;
+
 import 'dart:convert';
 import 'dart:io';
 import 'dart:typed_data';
-import 'package:vector_math/vector_math_64.dart';
-import 'package:image/image.dart';
+
+import 'package:meta/meta.dart';
 import 'package:ttf_parser/ttf_parser.dart';
+import 'package:vector_math/vector_math_64.dart';
 
-part 'src/ascii85.dart';
+part 'src/annotation.dart';
 part 'src/array.dart';
+part 'src/ascii85.dart';
 part 'src/border.dart';
 part 'src/catalog.dart';
 part 'src/color.dart';
@@ -45,6 +47,8 @@ part 'src/document.dart';
 part 'src/font.dart';
 part 'src/font_descriptor.dart';
 part 'src/formxobject.dart';
+part 'src/graphics.dart';
+part 'src/image.dart';
 part 'src/info.dart';
 part 'src/object.dart';
 part 'src/object_stream.dart';
@@ -55,11 +59,9 @@ part 'src/page_format.dart';
 part 'src/page_list.dart';
 part 'src/point.dart';
 part 'src/polygon.dart';
-part 'src/annotation.dart';
-part 'src/graphics.dart';
-part 'src/image.dart';
 part 'src/rect.dart';
 part 'src/stream.dart';
 part 'src/ttffont.dart';
 part 'src/xobject.dart';
 part 'src/xref.dart';
+

@@ -19,10 +19,22 @@
 part of pdf;
 
 class PDFImage extends PDFXObject {
-  final Image _img;
+  /// RGBA Image Data
+  final Uint8List image;
+
+  /// Image width
+  final int width;
+
+  /// Image height
+  final int height;
+
+  /// Image has alpha channel
+  final bool alpha;
+
   String _name;
 
-  final bool _alphaChannel;
+  /// Process alphaChannel only
+  final bool alphaChannel;
 
   /// Creates a new <code>PDFImage</code> instance.
   ///
@@ -32,63 +44,62 @@ class PDFImage extends PDFXObject {
   /// @param w an <code>int</code> value
   /// @param h an <code>int</code> value
   /// @param obs an <code>ImageObserver</code> value
-  PDFImage(PDFDocument pdfDocument, this._img, [this._alphaChannel = false]) : super(pdfDocument, "/Image", isBinary: true) {
+  PDFImage(PDFDocument pdfDocument,
+      {@required this.image,
+      @required this.width,
+      @required this.height,
+      this.alpha = true,
+      this.alphaChannel = false})
+      : assert(alphaChannel == false || alpha == true),
+        assert(width != null),
+        assert(height != null),
+        super(pdfDocument, "/Image", isBinary: true) {
     _name = "/Image$objser";
-    params["/Width"] = PDFStream.string(_img.width.toString());
-    params["/Height"] = PDFStream.string(_img.height.toString());
+    params["/Width"] = PDFStream.string(width.toString());
+    params["/Height"] = PDFStream.string(height.toString());
     params["/BitsPerComponent"] = PDFStream.intNum(8);
     params['/Name'] = PDFStream.string(_name);
 
-    if (_alphaChannel == false && _img.numChannels == 4) {
-      var _sMask = new PDFImage(pdfDocument, this._img, true);
+    if (alphaChannel == false && alpha) {
+      var _sMask = new PDFImage(pdfDocument,
+          image: image, width: width, height: height, alpha: alpha, alphaChannel: true);
       params["/SMask"] = PDFStream.string("${_sMask.objser} 0 R");
     }
 
-    if (_alphaChannel) {
+    if (alphaChannel) {
       params["/ColorSpace"] = PDFStream.string("/DeviceGray");
     } else {
       params["/ColorSpace"] = PDFStream.string("/DeviceRGB");
     }
+  }
 
+  @override
+  void prepare() {
     // write the pixels to the stream
     // print("Processing image ${img.width}x${img.height} pixels");
 
-    int w = _img.width;
-    int h = _img.height;
+    int w = width;
+    int h = height;
     int s = w * h;
 
-    Uint8List out = new Uint8List(_alphaChannel ? s : s * 3);
+    Uint8List out = new Uint8List(alphaChannel ? s : s * 3);
 
-    if (_alphaChannel) {
+    if (alphaChannel) {
       for (int i = 0; i < s; i++) {
-        final p = _img.data[i];
-        final int alpha = (p >> 24) & 0xff;
-
-        out[i] = alpha;
+        out[i] = image[i * 4 + 3];
       }
     } else {
       for (int i = 0; i < s; i++) {
-        final p = _img.data[i];
-        final int blue = (p >> 16) & 0xff;
-        final int green = (p >> 8) & 0xff;
-        final int red = p & 0xff;
-
-        out[i * 3] = red;
-        out[i * 3 + 1] = green;
-        out[i * 3 + 2] = blue;
+        out[i * 3] = image[i * 4];
+        out[i * 3 + 1] = image[i * 4 + 1];
+        out[i * 3 + 2] = image[i * 4 + 2];
       }
     }
 
     buf.putBytes(out);
-  }
 
-  /// Get the value of width.
-  /// @return value of width.
-  int get width => _img.width;
-
-  /// Get the value of height.
-  /// @return value of height.
-  int get height => _img.height;
+    super.prepare();
+  }
 
   /// Get the name
   ///

@@ -57,6 +57,7 @@ class PDFObject {
   }
 
   /// Prepare the object to be written to the stream
+  @mustCallSuper
   void prepare() {}
 
   /// The write method should call this before writing anything to the

@@ -31,7 +31,8 @@ class PDFObjectStream extends PDFObject {
   /// <p>By default, the stream will be compressed.
   /// @param type type for the stream
   /// @see PDFImage
-  PDFObjectStream(PDFDocument pdfDocument, {String type, this.isBinary = false}) : super(pdfDocument, type);
+  PDFObjectStream(PDFDocument pdfDocument, {String type, this.isBinary = false})
+      : super(pdfDocument, type);
 
   Uint8List _data;
 
@@ -40,7 +41,7 @@ class PDFObjectStream extends PDFObject {
     super.prepare();
 
     if (pdfDocument.deflate) {
-      var z = new ZLibCodec(level: ZLibOption.MAX_LEVEL);
+      var z = new ZLibCodec(level: ZLibOption.maxLevel);
       _data = z.encode(buf.output());
       params["/Filter"] = PDFStream.string("/FlateDecode");
     } else if (isBinary) {

@@ -5,7 +5,6 @@ homepage: https://github.com/davbfr/dart_pdf
 version: 1.0.0
 
 dependencies:
-  image: "^1.1.29"
   ttf_parser: "^1.0.0"
   vector_math:
 

 import 'dart:io';
 import 'dart:math';
 
-import 'package:image/image.dart';
 import 'package:pdf/pdf.dart';
 import 'package:test/test.dart';
 import 'package:vector_math/vector_math_64.dart';
 
-
 void main() {
   test('Pdf', () {
-    Image img = new Image(10, 10);
-    img.fill(0x12345678);
+//    Image img = new Image(10, 10);
+//    img.fill(0x12345678);
 
     var pdf = new PDFDocument(deflate: false);
     var i = pdf.info;
@@ -29,7 +27,8 @@ void main() {
     g.restoreContext();
     var font1 = new PDFFont(pdf);
 
-    var font2 = new PDFTTFFont(pdf, new File("../assets/Nunito-Regular.ttf").readAsBytesSync());
+    var font2 =
+        new PDFTTFFont(pdf, new File("../assets/Nunito-Regular.ttf").readAsBytesSync());
     var s = "Hello World!";
     var r = font2.stringBounds(s);
     const FS = 20.0;
@@ -47,7 +46,8 @@ void main() {
     g.drawRect(300.0, 150.0, 50.0, 50.0);
     g.fillPath();
     g.setColor(new PDFColor(0.0, 0.5, 0.0));
-    var image = new PDFImage(pdf, img);
+//    var image = new PDFImage(pdf,
+//        image: img.data.buffer.asUint8List(), width: img.width, height: img.height);
     for (var i = 10.0; i < 90.0; i += 5.0) {
       g.saveContext();
       var tm = new Matrix4.identity();
@@ -55,7 +55,7 @@ void main() {
       tm.translate(300.0, -100.0);
       g.setTransform(tm);
       g.drawString(font1, 12.0, "Hello $i", 20.0, 100.0);
-      g.drawImage(image, 100.0, 100.0, 80.0);
+//      g.drawImage(image, 100.0, 100.0, 80.0);
       g.restoreContext();
     }