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[DRAFT] Using original alpha for masking #5

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[DRAFT] Using original alpha for masking #5

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985764e
using original alpha for masking
uuuulala Feb 19, 2025
93ee455
keep alpha 0-255 range
uuuulala Feb 19, 2025
162ce97
no blur on texture edges
uuuulala Feb 19, 2025
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4 changes: 2 additions & 2 deletions src/app/hero/liquid-frag.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -140,8 +140,8 @@ void main() {
float thin_strip_2_width = cycle_width * thin_strip_2_ratio;


opacity = smoothstep(1., 1. - 1e-4 - u_edgeBlur, edge);
opacity *= get_img_frame_alpha(img_uv, 1e-2);
opacity = img.a;
opacity *= get_img_frame_alpha(img_uv, 0.);


float noise = snoise(uv - t);
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28 changes: 14 additions & 14 deletions src/app/hero/parse-logo-image.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -69,25 +69,28 @@ export function parseLogoImage(file: File): Promise<{ imageData: ImageData; pngB
var g = data[idx4 + 1];
var b = data[idx4 + 2];
var a = data[idx4 + 3];
if ((r === 255 && g === 255 && b === 255 && a === 255) || a === 0) {
shapeMask[y * width + x] = false;
} else {
shapeMask[y * width + x] = true;

// keep original value
shapeMask[y * width + x] = a;

// or #ffffff transparent
if (r === 255 && g === 255 && b === 255) {
shapeMask[y * width + x] = 0;
}
}
}

function inside(x: number, y: number) {
if (x < 0 || x >= width || y < 0 || y >= height) return false;
return shapeMask[y * width + x];
return shapeMask[y * width + x] > 0;
}

// 2) Identify boundary (pixels that have at least one non-shape neighbor)
var boundaryMask = new Array(width * height).fill(false);
for (var y = 0; y < height; y++) {
for (var x = 0; x < width; x++) {
var idx = y * width + x;
if (!shapeMask[idx]) continue;
if (shapeMask[idx] > 0) continue;
var isBoundary = false;
for (var ny = y - 1; ny <= y + 1 && !isBoundary; ny++) {
for (var nx = x - 1; nx <= x + 1 && !isBoundary; nx++) {
Expand All @@ -110,15 +113,15 @@ export function parseLogoImage(file: File): Promise<{ imageData: ImageData; pngB

function getU(x: number, y: number, arr: Float32Array) {
if (x < 0 || x >= width || y < 0 || y >= height) return 0;
if (!shapeMask[y * width + x]) return 0;
if (shapeMask[y * width + x] === 0) return 0;
return arr[y * width + x];
}

for (var iter = 0; iter < ITERATIONS; iter++) {
for (var y = 0; y < height; y++) {
for (var x = 0; x < width; x++) {
var idx = y * width + x;
if (!shapeMask[idx] || boundaryMask[idx]) {
if (shapeMask[idx] === 0 || boundaryMask[idx]) {
newU[idx] = 0;
continue;
}
Expand All @@ -144,20 +147,17 @@ export function parseLogoImage(file: File): Promise<{ imageData: ImageData; pngB
for (var x = 0; x < width; x++) {
var idx = y * width + x;
var px = idx * 4;
if (!shapeMask[idx]) {
outImg.data[px] = 255;
outImg.data[px + 1] = 255;
outImg.data[px + 2] = 255;
outImg.data[px + 3] = 255;
if (shapeMask[idx] === 0) {

} else {
const raw = u[idx] / maxVal;
const remapped = Math.pow(raw, alpha);
const gray = 255 * (1 - remapped);
outImg.data[px] = gray;
outImg.data[px + 1] = gray;
outImg.data[px + 2] = gray;
outImg.data[px + 3] = 255;
}
outImg.data[px + 3] = shapeMask[idx];
}
}
ctx.putImageData(outImg, 0, 0);
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