diff --git a/cmd/showcase/main.mbt b/cmd/showcase/main.mbt
index 3d74e03..773523e 100644
--- a/cmd/showcase/main.mbt
+++ b/cmd/showcase/main.mbt
@@ -59,9 +59,49 @@ fn main {
if !ok {
abort("showcase: PNG round trip failed")
}
- // Emit the status as a PPM comment *after* the magic number, so stdout
+ // Analysis self-check on a controlled flat tile: salt-and-pepper noise
+ // then a median filter, which on a uniform field provably restores almost
+ // every pixel. Confirms the noise + median + phash APIs compose; the
+ // perceptual-hash distances (clean vs noisy vs denoised) are reported as a
+ // diagnostic. (The median is deliberately not run on the detailed showcase
+ // image itself, where it would also reshape genuine edges.)
+ let tile = @pixelforge.Image::new(32, 32)
+ tile.fill_rect(0, 0, 32, 32, b'\x80', b'\x80', b'\x80', b'\xFF')
+ let clean_hash = tile.average_hash()
+ let noisy = tile.add_salt_pepper(2026UL, 0.08)
+ let denoised = noisy.median()
+ let noisy_diff = pixel_diff(tile, noisy)
+ let denoised_diff = pixel_diff(tile, denoised)
+ if denoised_diff >= noisy_diff {
+ abort("showcase: median denoise did not reduce the pixel difference")
+ }
+ let noisy_dist = @pixelforge.hamming_distance(
+ clean_hash,
+ noisy.average_hash(),
+ )
+ let denoised_dist = @pixelforge.hamming_distance(
+ clean_hash,
+ denoised.average_hash(),
+ )
+ // Emit the status as PPM comments *after* the magic number, so stdout
// stays a strictly valid PPM stream.
- print_ppm(final_img, "# PNG round trip: OK (\{png.length()} bytes)")
+ print_ppm(
+ final_img,
+ "# PNG round trip: OK (\{png.length()} bytes); denoise diff \{noisy_diff}->\{denoised_diff}; phash noisy=\{noisy_dist} denoised=\{denoised_dist}",
+ )
+}
+
+///|
+/// Counts channels that differ between two same-size images (a coarse
+/// distance used only for the showcase self-check).
+fn pixel_diff(a : @pixelforge.Image, b : @pixelforge.Image) -> Int {
+ let mut diff = 0
+ for i in 0..<(a.width * a.height * 4) {
+ if a.data[i].to_int() != b.data[i].to_int() {
+ diff = diff + 1
+ }
+ }
+ diff
}
///|
diff --git a/web/bindings.mbt b/web/bindings.mbt
index c89994a..8e92692 100644
--- a/web/bindings.mbt
+++ b/web/bindings.mbt
@@ -34,3 +34,15 @@ pub fn encode_png(
}
out
}
+
+///|
+/// 256-bin luma histogram of an RGBA buffer, for the playground's live
+/// histogram panel. Returns a `FixedArray[Int]` (a plain JS array of 256
+/// numbers on the js backend).
+pub fn luma_histogram(
+ data : FixedArray[Byte],
+ width : Int,
+ height : Int,
+) -> FixedArray[Int] {
+ @pixelforge.Image::from_bytes(width, height, data).histogram_luma()
+}
diff --git a/web/dist/web.js b/web/dist/web.js
index 266dde7..69b4232 100644
--- a/web/dist/web.js
+++ b/web/dist/web.js
@@ -203,6 +203,48 @@ function _M0MP270717lee10pixelforge5Image14flip__vertical(self) {
}
return out;
}
+function _M0MP270717lee10pixelforge5Image8map__rgb(self, transform) {
+ const out = _M0MP270717lee10pixelforge5Image4copy(self);
+ const n = Math.imul(self.width, self.height) | 0;
+ let _tmp = 0;
+ while (true) {
+ const p = _tmp;
+ if (p < n) {
+ const base = Math.imul(p, 4) | 0;
+ const _tmp$2 = self.data;
+ $bound_check(_tmp$2, base);
+ const r = _tmp$2[base];
+ const _tmp$3 = self.data;
+ const _tmp$4 = base + 1 | 0;
+ $bound_check(_tmp$3, _tmp$4);
+ const g = _tmp$3[_tmp$4];
+ const _tmp$5 = self.data;
+ const _tmp$6 = base + 2 | 0;
+ $bound_check(_tmp$5, _tmp$6);
+ const b = _tmp$5[_tmp$6];
+ const _bind = transform(r, g, b);
+ const _nr = _bind._0;
+ const _ng = _bind._1;
+ const _nb = _bind._2;
+ const _tmp$7 = out.data;
+ $bound_check(_tmp$7, base);
+ _tmp$7[base] = _nr < 0 ? 0 : _nr > 255 ? 255 : _nr & 255;
+ const _tmp$8 = out.data;
+ const _tmp$9 = base + 1 | 0;
+ $bound_check(_tmp$8, _tmp$9);
+ _tmp$8[_tmp$9] = _ng < 0 ? 0 : _ng > 255 ? 255 : _ng & 255;
+ const _tmp$10 = out.data;
+ const _tmp$11 = base + 2 | 0;
+ $bound_check(_tmp$10, _tmp$11);
+ _tmp$10[_tmp$11] = _nb < 0 ? 0 : _nb > 255 ? 255 : _nb & 255;
+ _tmp = p + 1 | 0;
+ continue;
+ } else {
+ break;
+ }
+ }
+ return out;
+}
function _M0FP270717lee10pixelforge8push__u8(buf, v) {
_M0MPC15array5Array4pushGyE(buf, (((v % 256 | 0) + 256 | 0) % 256 | 0) & 255);
}
@@ -494,48 +536,6 @@ function _M0MP270717lee10pixelforge5Image15otsu__threshold(self) {
}
return best_t;
}
-function _M0MP270717lee10pixelforge5Image8map__rgb(self, transform) {
- const out = _M0MP270717lee10pixelforge5Image4copy(self);
- const n = Math.imul(self.width, self.height) | 0;
- let _tmp = 0;
- while (true) {
- const p = _tmp;
- if (p < n) {
- const base = Math.imul(p, 4) | 0;
- const _tmp$2 = self.data;
- $bound_check(_tmp$2, base);
- const r = _tmp$2[base];
- const _tmp$3 = self.data;
- const _tmp$4 = base + 1 | 0;
- $bound_check(_tmp$3, _tmp$4);
- const g = _tmp$3[_tmp$4];
- const _tmp$5 = self.data;
- const _tmp$6 = base + 2 | 0;
- $bound_check(_tmp$5, _tmp$6);
- const b = _tmp$5[_tmp$6];
- const _bind = transform(r, g, b);
- const _nr = _bind._0;
- const _ng = _bind._1;
- const _nb = _bind._2;
- const _tmp$7 = out.data;
- $bound_check(_tmp$7, base);
- _tmp$7[base] = _nr < 0 ? 0 : _nr > 255 ? 255 : _nr & 255;
- const _tmp$8 = out.data;
- const _tmp$9 = base + 1 | 0;
- $bound_check(_tmp$8, _tmp$9);
- _tmp$8[_tmp$9] = _ng < 0 ? 0 : _ng > 255 ? 255 : _ng & 255;
- const _tmp$10 = out.data;
- const _tmp$11 = base + 2 | 0;
- $bound_check(_tmp$10, _tmp$11);
- _tmp$10[_tmp$11] = _nb < 0 ? 0 : _nb > 255 ? 255 : _nb & 255;
- _tmp = p + 1 | 0;
- continue;
- } else {
- break;
- }
- }
- return out;
-}
function _M0MP270717lee10pixelforge5Image4otsu(self) {
const t = _M0MP270717lee10pixelforge5Image15otsu__threshold(self);
return _M0MP270717lee10pixelforge5Image8map__rgb(self, (r, g, b) => {
@@ -550,6 +550,9 @@ function _M0MP270717lee10pixelforge5Image11from__bytes(width, height, data) {
}
return new _M0TP270717lee10pixelforge5Image(width, height, data);
}
+function _M0MP270717lee10pixelforge5Image15histogram__luma(self) {
+ return _M0MP270717lee10pixelforge5Image15luma__histogram(self);
+}
function _M0MP270717lee10pixelforge5Image5gamma(self, value) {
const g = value <= 0 ? 1 : value;
const inv = 1 / g;
@@ -647,11 +650,11 @@ function _M0MP270717lee10pixelforge5Image6invert(self) {
function _M0MP270717lee10pixelforge5Image10brightness(self, delta) {
return _M0MP270717lee10pixelforge5Image8map__rgb(self, (r, g, b) => ({ _0: r + delta | 0, _1: g + delta | 0, _2: b + delta | 0 }));
}
-function _M0MP270717lee10pixelforge5Image8contrastN5applyS561(factor, c) {
+function _M0MP270717lee10pixelforge5Image8contrastN5applyS630(factor, c) {
return _M0MPC16double6Double7to__int((c + 0 - 128) * factor + 128);
}
function _M0MP270717lee10pixelforge5Image8contrast(self, factor) {
- return _M0MP270717lee10pixelforge5Image8map__rgb(self, (r, g, b) => ({ _0: _M0MP270717lee10pixelforge5Image8contrastN5applyS561(factor, r), _1: _M0MP270717lee10pixelforge5Image8contrastN5applyS561(factor, g), _2: _M0MP270717lee10pixelforge5Image8contrastN5applyS561(factor, b) }));
+ return _M0MP270717lee10pixelforge5Image8map__rgb(self, (r, g, b) => ({ _0: _M0MP270717lee10pixelforge5Image8contrastN5applyS630(factor, r), _1: _M0MP270717lee10pixelforge5Image8contrastN5applyS630(factor, g), _2: _M0MP270717lee10pixelforge5Image8contrastN5applyS630(factor, b) }));
}
function _M0MP270717lee10pixelforge5Image5sepia(self) {
return _M0MP270717lee10pixelforge5Image8map__rgb(self, (r, g, b) => {
@@ -1653,4 +1656,7 @@ function _M0FP370717lee10pixelforge3web11encode__png(data, width, height) {
}
return out;
}
-export { _M0FP370717lee10pixelforge3web13apply__filter as apply_filter, _M0FP370717lee10pixelforge3web11encode__png as encode_png }
+function _M0FP370717lee10pixelforge3web15luma__histogram(data, width, height) {
+ return _M0MP270717lee10pixelforge5Image15histogram__luma(_M0MP270717lee10pixelforge5Image11from__bytes(width, height, data));
+}
+export { _M0FP370717lee10pixelforge3web13apply__filter as apply_filter, _M0FP370717lee10pixelforge3web11encode__png as encode_png, _M0FP370717lee10pixelforge3web15luma__histogram as luma_histogram }
diff --git a/web/index.html b/web/index.html
index 15a27b6..3c6492c 100644
--- a/web/index.html
+++ b/web/index.html
@@ -125,6 +125,11 @@ 性能
+
+