@rangertechnologies/ngnxt
Version:
This library was used for creating dymanic UI based on the input JSON/data
75 lines • 11.6 kB
JavaScript
/*
* Hermite resize - fast image resize/resample using Hermite filter.
* https://github.com/viliusle/Hermite-resize
*/
export function resizeCanvas(canvas, width, height) {
const width_source = canvas.width;
const height_source = canvas.height;
width = Math.round(width);
height = Math.round(height);
const ratio_w = width_source / width;
const ratio_h = height_source / height;
const ratio_w_half = Math.ceil(ratio_w / 2);
const ratio_h_half = Math.ceil(ratio_h / 2);
const ctx = canvas.getContext('2d');
if (ctx) {
const img = ctx.getImageData(0, 0, width_source, height_source);
const img2 = ctx.createImageData(width, height);
const data = img.data;
const data2 = img2.data;
for (let j = 0; j < height; j++) {
for (let i = 0; i < width; i++) {
const x2 = (i + j * width) * 4;
const center_y = j * ratio_h;
let weight = 0;
let weights = 0;
let weights_alpha = 0;
let gx_r = 0;
let gx_g = 0;
let gx_b = 0;
let gx_a = 0;
const xx_start = Math.floor(i * ratio_w);
const yy_start = Math.floor(j * ratio_h);
let xx_stop = Math.ceil((i + 1) * ratio_w);
let 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 (let yy = yy_start; yy < yy_stop; yy++) {
const dy = Math.abs(center_y - yy) / ratio_h_half;
const center_x = i * ratio_w;
const w0 = dy * dy; //pre-calc part of w
for (let xx = xx_start; xx < xx_stop; xx++) {
const dx = Math.abs(center_x - xx) / ratio_w_half;
const w = Math.sqrt(w0 + dx * dx);
if (w >= 1) {
//pixel too far
continue;
}
//hermite filter
weight = 2 * w * w * w - 3 * w * w + 1;
const 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"]}