BitmapFactory.ios.js

// The MIT License (MIT)
// 
// Copyright (c) Marcel Joachim Kloubert <marcel.kloubert@gmx.net>
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

var BitmapFactoryCommons = require('./BitmapFactory.commons');
var ImageSource = require('image-source');
var TypeUtils = require("utils/types");

// default options
var defaultOptions;
function getDefaultOpts() {
    return defaultOptions;
}
exports.getDefaultOpts = getDefaultOpts;
function setDefaultOpts(opts) {
    defaultOptions = opts;
}
exports.setDefaultOpts = setDefaultOpts;

function iOSImage(uiImage, opts) {
    if (!(this instanceof iOSImage)) {
        return new iOSImage(uiImage, opts);
    }

    this._isDisposed = false;
    this._nativeObject = uiImage;
    this._options = opts;
}
exports.BitmapClass = iOSImage;

// [iOS INTERNAL] __CGImage
Object.defineProperty(iOSImage.prototype, '__CGImage', {
    get: function() { return this._nativeObject.CGImage; }
});

// [iOS INTERNAL] __doAutoRelease
Object.defineProperty(iOSImage.prototype, '__doAutoRelease', {
    get: function() {
        var autoRelease = true;

        var opts = this._options || {};
        if (!TypeUtils.isNullOrUndefined(opts.ios)) {
            if (!TypeUtils.isNullOrUndefined(opts.ios.autoRelease)) {
                autoRelease = !!opts.ios.autoRelease;
            }
        }

        return autoRelease;
    }
});

// [iOS INTERNAL] __onImageContext()
iOSImage.prototype.__onImageContext = function(action, tag) {
    var oldImg = this._nativeObject;
    
    UIGraphicsBeginImageContext(CGSizeMake(oldImg.size.width, oldImg.size.height));
    var newImage;
    var result;
    try {
        var context = UIGraphicsGetCurrentContext();

        oldImg.drawInRect(CGRectMake(0, 0,
                                     oldImg.size.width, oldImg.size.height));

        result = action(context, tag, oldImg);

        newImage = UIGraphicsGetImageFromCurrentImageContext();
    }
    finally {
        UIGraphicsEndImageContext();
    }

    this._nativeObject = newImage;

    // free memory of old image
    try {
        var cImg = oldImg.CGImage;
        try {
            if (!TypeUtils.isNullOrUndefined(cImg)) {
                if (!this.__doAutoRelease) {
                    CGImageRelease(oldImg.CGImage);  // invoke manually
                }
            }
        }
        finally {
            cImg = null;
        }
    }
    finally {
        oldImg = null;
    }

    return result;
};

// [iOS INTERNAL] __toIOSColor()
iOSImage.prototype.__toIOSColor = function(color) {
    if (TypeUtils.isNullOrUndefined(color)) {
        return null;
    }
    
    return {
        a: color.a / 255.0,
        r: color.r / 255.0,
        g: color.g / 255.0,
        b: color.b / 255.0
    };
};

// [INTERNAL] _clone()
iOSImage.prototype._clone = function() {
    return new iOSImage(UIImage.imageWithData(UIImagePNGRepresentation(this._nativeObject)));
};

// [INTERNAL] _crop()
iOSImage.prototype._crop = function(leftTop, size) {
    return this.__onImageContext(function(context, tag, oldImage) {
        var rect = CGRectMake(leftTop.x, leftTop.y,
                              size.width, size.height);

        var imageRef = CGImageCreateWithImageInRect(oldImage.CGImage, rect);
        return UIImage(imageRef);
    });
};

// _dispose()
iOSImage.prototype._dispose = function(action, tag) {
    var nObj = this._nativeObject;
    try {
        if (!TypeUtils.isNullOrUndefined(nObj)) {
            var cImg = nObj.CGImage;
            try {
                if (!TypeUtils.isNullOrUndefined(cImg)) {
                    if (!this.__doAutoRelease) {
                        CGImageRelease(cImg);
                    }
                }
            }
            finally {
                cImg = null;
            }
        }
    }
    finally {
        this._nativeObject = null;
        nObj = null;
    }
};

// [INTERNAL] _drawLine()
iOSImage.prototype._drawLine = function(start, end, color, strokeWidth) {
    color = this.__toIOSColor(color);

    this.__onImageContext(function(context, tag, oldImage) {
        CGContextSetRGBStrokeColor(context,
                                   color.r, color.g, color.b, color.a);

        CGContextSetLineWidth(context, strokeWidth || 1.0);

        CGContextMoveToPoint(context, start.x, start.y);
        CGContextAddLineToPoint(context,
                                end.x, end.y);

        CGContextStrokePath(context);
    });
};

// [INTERNAL] _drawOval()
iOSImage.prototype._drawOval = function(size, leftTop, color, fillColor) {
    color = this.__toIOSColor(color);
    fillColor = this.__toIOSColor(fillColor);

    this.__onImageContext(function(context, tag, oldImage) {
        CGContextSetRGBStrokeColor(context,
                                   color.r, color.g, color.b, color.a);

        var rect = CGRectMake(leftTop.x, leftTop.y,
                              size.width, size.height);

        if (null !== fillColor) {
            CGContextSetRGBFillColor(context,
                                     fillColor.r, fillColor.g, fillColor.b, fillColor.a);

            CGContextFillEllipseInRect(context, rect);
        }
        
        CGContextStrokeEllipseInRect(context, rect);
    });
};

// [INTERNAL] _drawArc()
iOSImage.prototype._drawArc = function(size, leftTop, startAngle, endAngle, color, fillColor) {
    color = this.__toIOSColor(color);
    fillColor = this.__toIOSColor(fillColor);

    // Angles come in degrees, convert to radians for iOS
    var iosStartAngle = startAngle*(Math.PI/180.0);
    // We get a sweep angle, add to start angle to get iOS end angle
    var iosEndAngle = iosStartAngle + endAngle*(Math.PI/180.0);

    this.__onImageContext(function(context, tag, oldImage) {
        CGContextSetRGBStrokeColor(context,
                                   color.r, color.g, color.b, color.a);

        var radius = Math.min(size.width, size.height)*0.5

        if (null !== fillColor) {
            CGContextSetRGBFillColor(context,
                                     fillColor.r, fillColor.g, fillColor.b, fillColor.a);

        }
        CGContextMoveToPoint(context, (size.width*0.5)+leftTop.x, (size.height*0.5)+leftTop.y);
        CGContextAddArc(context, (size.width*0.5)+leftTop.x, (size.height*0.5)+leftTop.y, radius, iosStartAngle, iosEndAngle, 0);
        if (null !== fillColor) {
          CGContextFillPath(context);
        }
    });
};

// [INTERNAL] _drawRect()
iOSImage.prototype._drawRect = function(size, leftTop, color, fillColor) {
    color = this.__toIOSColor(color);
    fillColor = this.__toIOSColor(fillColor);

    this.__onImageContext(function(context, tag, oldImage) {
        CGContextSetRGBStrokeColor(context,
                                   color.r, color.g, color.b, color.a);

        var rect = CGRectMake(leftTop.x, leftTop.y,
                              size.width, size.height);

        if (null !== fillColor) {
            CGContextSetRGBFillColor(context,
                                     fillColor.r, fillColor.g, fillColor.b, fillColor.a);

            CGContextFillRect(context, rect);
        }
        
        CGContextStrokeRect(context, rect);
    });
};

// [INTERNAL] _getPoint()
iOSImage.prototype._getPoint = function(coordinates) {
    var pixelData = CGDataProviderCopyData(CGImageGetDataProvider(this.__CGImage));
    var data = CFDataGetBytePtr(pixelData);

    var pixelInfo = ((this.width * coordinates.y) + coordinates.x) * 4;

    var r = data[pixelInfo];
    var g = data[pixelInfo + 1];
    var b = data[pixelInfo + 2];
    var a = data[pixelInfo + 3];

    return (a << 24) | (r << 16) | (g << 8) | b;
};

// [INTERNAL] _insert()
iOSImage.prototype._insert = function(other, leftTop) {
    var bmp = asBitmapObject(other);
    if (false === bmp) {
        throw "NO valid bitmap!";
    }

    this.__onImageContext(function(context, tag, oldImage) {
        var left = leftTop.x;
        var top = leftTop.y;
        var width = Math.min(bmp.width,
                             oldImage.size.width - left);
        var height = Math.min(bmp.height,
                              oldImage.size.height - top);

        bmp._nativeObject
           .drawInRect(CGRectMake(leftTop.x, leftTop.y,
                                  width, height));
    });
};

// [INTERNAL] _resize()
iOSImage.prototype._resize = function(newSize) {
    var oldImg = this._nativeObject;

    try {
        var ns = CGSizeMake(newSize.width, newSize.height);
        UIGraphicsBeginImageContextWithOptions(ns, false, 0.0);

        oldImg.drawInRect(CGRectMake(0, 0,
                                     ns.width, ns.height));

        return new iOSImage(UIGraphicsGetImageFromCurrentImageContext());
    }
    finally {
         UIGraphicsEndImageContext();
    }
};

// [INTERNAL] _rotate()
iOSImage.prototype._rotate = function(degrees) {
    radians = degrees * Math.PI / 180.0;

    var oldImg = this._nativeObject;

    try {
        UIGraphicsBeginImageContext(oldImg.size);

        var context = UIGraphicsGetCurrentContext();

        CGContextRotateCTM(context, radians);

        oldImg.drawAtPoint(CGPointMake(0, 0));

        return UIGraphicsGetImageFromCurrentImageContext();
    }
    finally {
         UIGraphicsEndImageContext();
    }
};

// [INTERNAL] _setPoint()
iOSImage.prototype._setPoint = function(coordinates, color) {
    color = this.__toIOSColor(color);

    this.__onImageContext(function(context) {
        CGContextSetRGBFillColor(context, color.r, color.g, color.b, color.a);
        
        CGContextFillRect(context, CGRectMake(coordinates.x, coordinates.y,
                                              1, 1));
    });
};

// [INTERNAL] _toObject()
iOSImage.prototype._toObject = function(format, quality) {
    var img = this._nativeObject;

    var imageData = false;
    var mime;
    switch (format) {
        case 1:
            imageData = UIImagePNGRepresentation(img);
            mime = 'image/png';
            break;

        case 2:
            imageData = UIImageJPEGRepresentation(img, quality / 100.0);
            mime = 'image/jpeg';
            break;
    }

    if (false === imageData) {
        throw "Format '" + format + "' is NOT supported!";
    }

    if (TypeUtils.isNullOrUndefined(imageData)) {
        throw "Output image could not be created by iOS!";
    }

    var bitmapData = {};

    var base64 = imageData.base64EncodedStringWithOptions(null);
    
    // base64
    Object.defineProperty(bitmapData, 'base64', {
        get: function() { return base64; }
    });

    // mime
    Object.defineProperty(bitmapData, 'mime', {
        get: function() { return mime; }
    });

    return bitmapData;
}

// _writeText()
iOSImage.prototype._writeText = function(txt, leftTop, font) {
    var antiAlias;
    var fontColor;
    var fontSize;
    var fontName;
    if (null !== font) {
        fontColor = font.color;
        fontSize = font.size;
        fontName = font.name;
    }

    fontColor = this.normalizeColor(fontColor);
    fontColor = this.__toIOSColor(fontColor);

    if (TypeUtils.isNullOrUndefined(antiAlias)) {
        antiAlias = true;
    }

    var settings = NSMutableAttributedString.alloc().initWithString(txt);
    var settingsRange = NSMakeRange(0, settings.length);

    if (null !== fontColor) {
        var iosFontColor = UIColor.alloc()
                                  .initWithRedGreenBlueAlpha(fontColor.r, fontColor.g, fontColor.b,
                                                             fontColor.a);

        settings.addAttributeValueRange(NSForegroundColorAttributeName,
                                        iosFontColor,
                                        settingsRange);
    }

    if (TypeUtils.isNullOrUndefined(fontSize)) {
        fontSize = 10;
    }

    var iosFont;
    if (!TypeUtils.isNullOrUndefined(fontName)) {
        fontName = ('' + fontName).trim();
        if ('' !== fontName) {
            iosFont = UIFont.fontWithNameSize(fontName, fontSize);
        }
    }

    if (TypeUtils.isNullOrUndefined(iosFont)) {
        iosFont = UIFont.systemFontOfSize(fontSize);
    }

    settings.addAttributeValueRange(NSFontAttributeName, iosFont,
                                    settingsRange);
    
    this.__onImageContext(function(context, tag, oldImage) {
        if (antiAlias) {
            CGContextSetAllowsAntialiasing(context, true);
            CGContextSetShouldAntialias(context, true);
        }

        var rect = CGRectMake(leftTop.x, leftTop.y,
                              oldImage.size.width, oldImage.size.height);

        settings.drawInRect(CGRectIntegral(rect));
    });
};

// height
Object.defineProperty(iOSImage.prototype, 'height', {
    get: function() { return this._nativeObject.size.height; }
});

// isDisposed
Object.defineProperty(iOSImage.prototype, 'isDisposed', {
    get: function() { return this._isDisposed; }
});

// nativeObject
Object.defineProperty(iOSImage.prototype, 'nativeObject', {
    get: function() { return this._nativeObject; }
});

// width
Object.defineProperty(iOSImage.prototype, 'width', {
    get: function() { return this._nativeObject.size.width; }
});

// setup common methods and properties
BitmapFactoryCommons.setupBitmapClass(iOSImage);


function asBitmapObject(v) {
    var bmp = BitmapFactoryCommons.tryGetBitmapObject(iOSImage, v);
    if (false !== bmp) {
        return bmp;
    }

    var opts = defaultOptions;
    if (!opts) {
        opts = {};
    }

    if (typeof v === "string") {
        var data = NSData.alloc()
                         .initWithBase64Encoding(v);

        var img = UIImage.imageWithData(data);
        return new iOSImage(img, opts);
    }
    else if (v instanceof UIImage) {
        return new iOSImage(v, opts);
    }
    else if (v instanceof ImageSource.ImageSource) {
        return new iOSImage(v.ios, opts);
    }

    return false;
}
exports.asBitmapObject = asBitmapObject;
iOSImage.asBitmap = asBitmapObject;

function createBitmap(width, height, opts) {
    var img = new interop.Reference();

    UIGraphicsBeginImageContextWithOptions(CGSizeMake(width, height), false, 0.0);
    img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    if (TypeUtils.isNullOrUndefined(img)) {
        throw "Could not create UIImage!";
    }

    return new iOSImage(img, opts);
}
exports.createBitmap = createBitmap;

function makeBitmapMutable(uiImg, opts) {
    if (uiImg instanceof ImageSource.ImageSource) {
        return new makeBitmapMutable(uiImg.ios, opts);
    }

    if (uiImg instanceof iOSImage) {
        return new makeBitmapMutable(uiImg.nativeObject, opts);
    }

    if (!(uiImg instanceof UIImage)) {
        throw "No valid image object!";
    }

    return UIImage.imageWithData(UIImagePNGRepresentation(uiImg));
}
exports.makeBitmapMutable = makeBitmapMutable;