Readme

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 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 bytes);
• BitmapFont readFont(String fnt, Image page);
• Image readJpg(List bytes);
• Image readPng(List bytes);
• Image readTga(List bytes);
• Image remapColors(Image src, {int red: RED, int green: GREEN, int blue: BLUE, int alpha: ALPHA});
• Image smooth(Image src, num w);
• List writeJpg(Image image, {int quality: 100});
• List writePng(Image image, {int level: 6});
• List writeTga(Image image);