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image_view.test.js
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"use strict";
var mapnik = require('../');
var assert = require('assert');
var fs = require('fs');
describe('mapnik.ImageView ', function() {
it('should throw with invalid usage', function() {
// no 'new' keyword
assert.throws(function() { mapnik.ImageView(1, 1); });
assert.throws(function() { new mapnik.ImageView(); });
});
it('should be initialized properly', function() {
var im = new mapnik.Image(256, 256);
var view = im.view(0, 0, 256, 256);
assert.equal(view.isSolidSync(), true);
var pixel = view.getPixel(0, 0, {get_color:true});
assert.equal(pixel.r, 0);
assert.equal(pixel.g, 0);
assert.equal(pixel.b, 0);
assert.equal(pixel.a, 0);
im = new mapnik.Image(256, 256);
im.fill(new mapnik.Color(2, 2, 2, 2));
view = im.view(0, 0, 256, 256);
assert.equal(view.isSolidSync(), true);
pixel = view.getPixel(0, 0, {get_color:true});
assert.equal(pixel.r, 2);
assert.equal(pixel.g, 2);
assert.equal(pixel.b, 2);
assert.equal(pixel.a, 2);
assert.equal(view.getPixel(99999999, 9999999), undefined);
});
it('isSolid for view should return blue with view being offset', function(done) {
var im = new mapnik.Image(256, 256);
im.fill(new mapnik.Color('blue'));
im.setPixel(0,0,new mapnik.Color('green'));
var view = im.view(1, 1, 255, 255);
assert.equal(view.isSolid(), true);
assert.equal(view.isSolidSync(), true);
view.isSolid(function(err,solid,pixel) {
assert.equal(solid, true);
assert.equal(pixel, 4294901760);
done();
});
});
it('isSolid async works if true', function(done) {
var im = new mapnik.Image(256, 256);
var view = im.view(0, 0, 256, 256);
assert.equal(view.isSolidSync(), true);
view.isSolid(function(err,solid,pixel) {
assert.equal(solid, true);
assert.equal(pixel, 0);
done();
});
});
it('isSolid async works if true and white', function(done) {
var im = new mapnik.Image(256, 256);
var color = new mapnik.Color('white');
im.fill(color);
var view = im.view(0, 0, 256, 256);
assert.equal(view.isSolidSync(), true);
view.isSolid(function(err,solid,pixel) {
assert.equal(solid, true);
assert.equal(pixel, 4294967295);
done();
});
});
it('isSolid async works if false', function(done) {
var im = new mapnik.Image.open('./test/support/a.png');
var view = im.view(0, 0, im.width(), im.height());
assert.equal(view.isSolid(), false);
assert.throws(function() { view.isSolid(null); });
assert.equal(view.isSolidSync(), false);
view.isSolid(function(err,solid,pixel) {
assert.equal(solid, false);
assert.equal(pixel, undefined);
done();
});
});
it('isSolid should fail with bad parameters', function(done) {
var im = new mapnik.Image(0,0);
var view = im.view(0,0,0,0);
assert.throws(function() { view.isSolidSync(); });
view.isSolid(function(err,solid,pixel) {
assert.throws(function() { if (err) throw err; });
done();
});
});
it('getPixel should fail with bad parameters', function() {
var im = new mapnik.Image(4,4,{type: mapnik.imageType.rgba8});
im.fill(1);
var view = im.view(0,0,4,4);
assert.throws(function() { view.getPixel(); });
assert.throws(function() { view.getPixel(1); });
assert.throws(function() { view.getPixel(1,'2'); });
assert.throws(function() { view.getPixel('1',2); });
assert.throws(function() { view.getPixel(1,2, null); });
assert.throws(function() { view.getPixel(1,2, {get_color:1}); });
});
it('getPixel supports rgba8', function() {
var im = new mapnik.Image(4,4,{type: mapnik.imageType.rgba8});
im.fill(1);
var view = im.view(0,0,4,4);
assert.equal(view.getPixel(0,0), 1);
});
it('getPixel supports gray8', function() {
var im = new mapnik.Image(4,4,{type: mapnik.imageType.gray8});
im.fill(1);
var view = im.view(0,0,4,4);
assert.equal(view.getPixel(0,0), 1);
});
it('getPixel supports gray8s', function() {
var im = new mapnik.Image(4,4,{type: mapnik.imageType.gray8s});
im.fill(1);
var view = im.view(0,0,4,4);
assert.equal(view.getPixel(0,0), 1);
});
it('getPixel supports gray16', function() {
var im = new mapnik.Image(4,4,{type: mapnik.imageType.gray16});
im.fill(1);
var view = im.view(0,0,4,4);
assert.equal(view.getPixel(0,0), 1);
});
it('getPixel supports gray16s', function() {
var im = new mapnik.Image(4,4,{type: mapnik.imageType.gray16s});
im.fill(1);
var view = im.view(0,0,4,4);
assert.equal(view.getPixel(0,0), 1);
});
it('getPixel supports gray32', function() {
var im = new mapnik.Image(4,4,{type: mapnik.imageType.gray32});
im.fill(1);
var view = im.view(0,0,4,4);
assert.equal(view.getPixel(0,0), 1);
});
it('getPixel supports gray32s', function() {
var im = new mapnik.Image(4,4,{type: mapnik.imageType.gray32s});
im.fill(1);
var view = im.view(0,0,4,4);
assert.equal(view.getPixel(0,0), 1);
});
it('getPixel supports gray32f', function() {
var im = new mapnik.Image(4,4,{type: mapnik.imageType.gray32f});
im.fill(1);
var view = im.view(0,0,4,4);
assert.equal(view.getPixel(0,0), 1);
});
it('getPixel supports gray64', function() {
var im = new mapnik.Image(4,4,{type: mapnik.imageType.gray64});
im.fill(1);
var view = im.view(0,0,4,4);
assert.equal(view.getPixel(0,0), 1);
});
it('getPixel supports gray64s', function() {
var im = new mapnik.Image(4,4,{type: mapnik.imageType.gray64s});
im.fill(1);
var view = im.view(0,0,4,4);
assert.equal(view.getPixel(0,0), 1);
});
it('getPixel supports gray64f', function() {
var im = new mapnik.Image(4,4,{type: mapnik.imageType.gray64f});
im.fill(1);
var view = im.view(0,0,4,4);
assert.equal(view.getPixel(0,0), 1);
});
it('should throw with invalid encoding', function(done) {
var im = new mapnik.Image(256, 256);
var view = im.view(0,0,256,256);
assert.throws(function() { view.encodeSync('foo'); });
assert.throws(function() { view.encodeSync(1); });
assert.throws(function() { view.encodeSync('png', null); });
assert.throws(function() { view.encodeSync('png', {palette:null}); });
assert.throws(function() { view.encodeSync('png', {palette:{}}); });
assert.throws(function() { view.encode('png', {palette:{}}, function(err, result) {}); });
assert.throws(function() { view.encode('png', {palette:null}, function(err, result) {}); });
assert.throws(function() { view.encode('png', null, function(err, result) {}); });
assert.throws(function() { view.encode(1, {}, function(err, result) {}); });
assert.throws(function() { view.encode('png', {}, null); });
view.encode('foo', {}, function(err, result) {
assert.throws(function() { if (err) throw err; });
done();
});
});
it('should encode with a pallete', function(done) {
var im = new mapnik.Image(256, 256);
var view = im.view(0,0,256,256);
var pal = new mapnik.Palette(new Buffer('\xff\x09\x93\xFF\x01\x02\x03\x04','ascii'));
assert.ok(view.encodeSync('png', {palette:pal}));
view.encode('png', {palette:pal}, function(err, result) {
if (err) throw err;
assert.ok(result);
done();
});
});
it('should be able to save an ImageView', function(done) {
var im = new mapnik.Image(256, 256);
var view = im.view(0,0,256,256);
var pal = new mapnik.Palette(new Buffer('\xff\x09\x93\xFF\x01\x02\x03\x04','ascii'));
var expected = './test/tmp/mapnik-image-view-saved.png';
view.save(expected);
assert.ok(fs.existsSync(expected));
done();
});
it('should throw with invalid formats', function() {
var im = new mapnik.Image(256, 256);
var view = im.view(0,0,256,256);
assert.throws(function() { view.save('foo','foo'); });
assert.throws(function() { view.save(); });
assert.throws(function() { view.save('file.png', null); });
assert.throws(function() { view.save('foo'); });
assert.throws(function() { view.save('foo','foo'); });
assert.throws(function() { view.save(); });
assert.throws(function() { view.save('file.png', null); });
assert.throws(function() { view.save('foo'); });
assert.throws(function() { view.saveSync(); });
assert.throws(function() { view.saveSync('foo','foo'); });
assert.throws(function() { view.saveSync('file.png', null); });
assert.throws(function() { view.saveSync('foo'); });
assert.throws(function() { view.save(function(err) {}); });
assert.throws(function() { view.save('file.png', null, function(err) {}); });
assert.throws(function() { view.save('foo', function(err) {}); });
});
if (mapnik.supports.webp) {
it('should support webp encoding', function(done) {
var im = new mapnik.Image(256,256);
im.fill(new mapnik.Color('green'));
im.encode('webp',function(err,buf1) { // jshint ignore:line
if (err) throw err;
var v = im.view(0,0,256,256);
v.encode('webp', function(err,buf2) { // jshint ignore:line
if (err) throw err;
// disabled because this is not stable across mapnik versions or webp versions
//assert.equal(buf1.length,buf2.length);
done();
});
});
});
}
});