ngx-image-cropper-upgraded
Version:
An image cropper for Angular upgraded by Spymannn
116 lines • 12.9 kB
JavaScript
/**
* @fileoverview added by tsickle
* Generated from: lib/utils/resize.utils.ts
* @suppress {checkTypes,constantProperty,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
*/
/*
* Hermite resize - fast image resize/resample using Hermite filter.
* https://github.com/viliusle/Hermite-resize
*/
/**
* @param {?} canvas
* @param {?} width
* @param {?} height
* @return {?}
*/
export function resizeCanvas(canvas, width, height) {
/** @type {?} */
var width_source = canvas.width;
/** @type {?} */
var height_source = canvas.height;
width = Math.round(width);
height = Math.round(height);
/** @type {?} */
var ratio_w = width_source / width;
/** @type {?} */
var ratio_h = height_source / height;
/** @type {?} */
var ratio_w_half = Math.ceil(ratio_w / 2);
/** @type {?} */
var ratio_h_half = Math.ceil(ratio_h / 2);
/** @type {?} */
var ctx = canvas.getContext('2d');
if (ctx) {
/** @type {?} */
var img = ctx.getImageData(0, 0, width_source, height_source);
/** @type {?} */
var img2 = ctx.createImageData(width, height);
/** @type {?} */
var data = img.data;
/** @type {?} */
var data2 = img2.data;
for (var j = 0; j < height; j++) {
for (var i = 0; i < width; i++) {
/** @type {?} */
var x2 = (i + j * width) * 4;
/** @type {?} */
var center_y = j * ratio_h;
/** @type {?} */
var weight = 0;
/** @type {?} */
var weights = 0;
/** @type {?} */
var weights_alpha = 0;
/** @type {?} */
var gx_r = 0;
/** @type {?} */
var gx_g = 0;
/** @type {?} */
var gx_b = 0;
/** @type {?} */
var gx_a = 0;
/** @type {?} */
var xx_start = Math.floor(i * ratio_w);
/** @type {?} */
var yy_start = Math.floor(j * ratio_h);
/** @type {?} */
var xx_stop = Math.ceil((i + 1) * ratio_w);
/** @type {?} */
var yy_stop = Math.ceil((j + 1) * ratio_h);
xx_stop = Math.min(xx_stop, width_source);
yy_stop = Math.min(yy_stop, height_source);
for (var yy = yy_start; yy < yy_stop; yy++) {
/** @type {?} */
var dy = Math.abs(center_y - yy) / ratio_h_half;
/** @type {?} */
var center_x = i * ratio_w;
/** @type {?} */
var w0 = dy * dy;
for (var xx = xx_start; xx < xx_stop; xx++) {
/** @type {?} */
var dx = Math.abs(center_x - xx) / ratio_w_half;
/** @type {?} */
var w = Math.sqrt(w0 + dx * dx);
if (w >= 1) {
//pixel too far
continue;
}
//hermite filter
weight = 2 * w * w * w - 3 * w * w + 1;
/** @type {?} */
var pos_x = 4 * (xx + yy * width_source);
//alpha
gx_a += weight * data[pos_x + 3];
weights_alpha += weight;
//colors
if (data[pos_x + 3] < 255)
weight = weight * data[pos_x + 3] / 250;
gx_r += weight * data[pos_x];
gx_g += weight * data[pos_x + 1];
gx_b += weight * data[pos_x + 2];
weights += weight;
}
}
data2[x2] = gx_r / weights;
data2[x2 + 1] = gx_g / weights;
data2[x2 + 2] = gx_b / weights;
data2[x2 + 3] = gx_a / weights_alpha;
}
}
canvas.width = width;
canvas.height = height;
//draw
ctx.putImageData(img2, 0, 0);
}
}
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j < height; j++) {\n            for (let i = 0; i < width; i++) {\n                const x2 = (i + j * width) * 4;\n                const center_y = j * ratio_h;\n                let weight = 0;\n                let weights = 0;\n                let weights_alpha = 0;\n                let gx_r = 0;\n                let gx_g = 0;\n                let gx_b = 0;\n                let gx_a = 0;\n\n                const xx_start = Math.floor(i * ratio_w);\n                const yy_start = Math.floor(j * ratio_h);\n                let xx_stop = Math.ceil((i + 1) * ratio_w);\n                let yy_stop = Math.ceil((j + 1) * ratio_h);\n                xx_stop = Math.min(xx_stop, width_source);\n                yy_stop = Math.min(yy_stop, height_source);\n\n                for (let yy = yy_start; yy < yy_stop; yy++) {\n                    const dy = Math.abs(center_y - yy) / ratio_h_half;\n                    const center_x = i * ratio_w;\n                    const w0 = dy * dy; //pre-calc part of w\n                    for (let xx = xx_start; xx < xx_stop; xx++) {\n                        const dx = Math.abs(center_x - xx) / ratio_w_half;\n                        const w = Math.sqrt(w0 + dx * dx);\n                        if (w >= 1) {\n                            //pixel too far\n                            continue;\n                        }\n                        //hermite filter\n                        weight = 2 * w * w * w - 3 * w * w + 1;\n                        const pos_x = 4 * (xx + yy * width_source);\n                        //alpha\n                        gx_a += weight * data[pos_x + 3];\n                        weights_alpha += weight;\n                        //colors\n                        if (data[pos_x + 3] < 255)\n                            weight = weight * data[pos_x + 3] / 250;\n                        gx_r += weight * data[pos_x];\n                        gx_g += weight * data[pos_x + 1];\n                        gx_b += weight * data[pos_x + 2];\n                        weights += weight;\n                    }\n                }\n                data2[x2] = gx_r / weights;\n                data2[x2 + 1] = gx_g / weights;\n                data2[x2 + 2] = gx_b / weights;\n                data2[x2 + 3] = gx_a / weights_alpha;\n            }\n        }\n\n\n        canvas.width = width;\n        canvas.height = height;\n\n        //draw\n        ctx.putImageData(img2, 0, 0);\n    }\n}\n"]}