image

##Overview

A Dart library to encode and decode various image formats.

The library has no reliance on dart:io, so it can be used for both server and web applications. The image library currently supports the following formats:

  • PNG
  • JPG
  • TGA

##Sample

Load a jpeg, resize it, and save it as a png:

import 'dart:io' as Io;
import 'package:image/image.dart';
void main() {
  // Read a jpeg image from file.
  Image image = readJpg(new Io.File('res/cat-eye04.jpg').readAsBytesSync());

  // Resize the image to a 120x? thumbnail (maintaining the aspect ratio).
  Image thumbnail = copyResize(image, 120);

  // Save the thumbnail as a PNG.
  new Io.File('out/thumbnail-cat-eye04.png')
        ..createSync(recursive: true)
        ..writeAsBytesSync(writePng(thumbnail));
}

##Image Functions - Image brightness(Image src, int brightness); - Image colorOffset(Image src, int red, int green, int blue, int alpha); - Image contrast(Image src, num contrast); - Image convolution(Image src, List<num> filter, num filterDiv, num offset); - Image copyCrop(Image src, int x, int y, int w, int h); - Image copyGaussianBlur(Image src, int radius); - Image copyInto(Image dst, Image src, int dst_x, int dst_y, int src_x, int src_y, int dst_w, int dst_h, int src_w, int src_h); - Image copyResize(Image src, int width, int height = -1); - Image drawChar(Image image, BitmapFont font, int x, int y, String string, {int color: 0xffffffff}); - Image drawLine(Image image, int x1, int y1, int x2, int y2, int color,

                 {bool antialias: false, num thickness: 1});
  • Image drawString(Image image, BitmapFont font, int x, int y, String string, {int color: 0xffffffff});
  • Image dropShadow(Image src, int hshadow, int vshadow, int blur,

               {int shadowColor: 0x000000a0});
    
  • Image edgeDetectQuick(Image src);
  • Image emboss(Image src);
  • Image fill(Image image, int color);
  • Image fillRect(Image src, int x, int y, int w, int h, int color);
  • Image flip(Image src, int mode);
  • Image grayscale(Image src);
  • Image invert(Image src);
  • Image meanRemoval(Image src);
  • Image pixelate(Image src, int blockSize, {int mode: PIXELATE_UPPERLEFT});
  • BitmapFont readFontZip(List<int> bytes);
  • BitmapFont readFont(String fnt, Image page);
  • Image readJpg(List<int> bytes);
  • Image readPng(List<int> bytes);
  • Image readTga(List<int> bytes);
  • Image remapColors(Image src, {int red: RED, int green: GREEN, int blue: BLUE, int alpha: ALPHA});
  • Image smooth(Image src, num w);
  • List<int> writeJpg(Image image, {int quality: 100});
  • List<int> writePng(Image image, {int level: 6});
  • List<int> writeTga(Image image);

Libraries

image

The image library aims to provide server-side programs the ability to load, manipulate, and save various image file formats.