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Signed-off-by: npub1ux8n2yfs8qfvgd75s7kyhar2mztac355v6vmrz4juc9l3msw4pgstums9e <e18f3511303812c437d487ac4bf46ad897dc46946699b18ab2e60bf8ee0ea851@sprout-oss.stage.blox.sqprod.co> Co-authored-by: npub1ux8n2yfs8qfvgd75s7kyhar2mztac355v6vmrz4juc9l3msw4pgstums9e <e18f3511303812c437d487ac4bf46ad897dc46946699b18ab2e60bf8ee0ea851@sprout-oss.stage.blox.sqprod.co>
56 lines
3.0 KiB
Markdown
56 lines
3.0 KiB
Markdown
# Android Bitmap media fixtures
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These 3 x 2 fixtures were produced by Android 16 (API 36) `Bitmap.compress`, not by a generic image encoder.
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## Regeneration
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1. Compile and run the following program on an API 36 emulator:
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```java
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import android.graphics.Bitmap;
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import android.graphics.Color;
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import android.graphics.ColorSpace;
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import java.io.FileOutputStream;
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public final class Main {
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private static void write(Bitmap bitmap, Bitmap.CompressFormat format, String stem)
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throws Exception {
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String extension = format == Bitmap.CompressFormat.PNG ? "png" : "jpg";
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try (FileOutputStream output =
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new FileOutputStream("/data/local/tmp/" + stem + "." + extension)) {
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if (!bitmap.compress(format, 100, output)) {
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throw new IllegalStateException("Bitmap.compress failed for " + stem);
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}
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}
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}
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public static void main(String[] args) throws Exception {
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Bitmap srgb = Bitmap.createBitmap(3, 2, Bitmap.Config.ARGB_8888);
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srgb.setPixels(new int[] {
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Color.argb(255, 255, 0, 0), Color.argb(255, 0, 255, 0),
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Color.argb(255, 0, 0, 255), Color.argb(128, 255, 255, 0),
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Color.argb(64, 0, 255, 255), Color.argb(0, 255, 0, 255),
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}, 0, 3, 0, 0, 3, 2);
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write(srgb, Bitmap.CompressFormat.PNG, "bitmap-srgb");
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write(srgb, Bitmap.CompressFormat.JPEG, "bitmap-srgb");
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Bitmap displayP3 = Bitmap.createBitmap(
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3, 2, Bitmap.Config.RGBA_F16, true,
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ColorSpace.get(ColorSpace.Named.DISPLAY_P3));
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displayP3.eraseColor(Color.pack(
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1.0f, 0.0f, 0.0f, 1.0f,
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ColorSpace.get(ColorSpace.Named.DISPLAY_P3)));
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write(displayP3, Bitmap.CompressFormat.PNG, "bitmap-display-p3");
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write(displayP3, Bitmap.CompressFormat.JPEG, "bitmap-display-p3");
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}
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}
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```
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2. Pull the four files from `/data/local/tmp/` into this directory. Copy all four into `mobile/android/app/src/test/resources/fixtures/android/`, and copy `bitmap-display-p3.png` and `bitmap-srgb.png` into `mobile/android/app/src/androidTest/resources/fixtures/android/`.
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3. Run `cmp` on every copied fixture to confirm it is byte-identical.
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4. Run the app's `AndroidImageProcessor.decodeSrgbBitmap` and `encodeAndScrub` path for both source color spaces and both formats on the API 36 emulator. Save the four outputs under `sanitized/` with the `-sanitized` suffix.
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5. Run `cargo test -p buzz-media android_` to verify the relay accepts every sanitized fixture while rejecting the three unsanitized fixtures that contain forbidden metadata.
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6. Run `cd mobile/android && ./gradlew app:testDebugUnitTest app:connectedDebugAndroidTest` with an API 36 emulator to verify structural scrubbing and the Display-P3 to sRGB conversion for sanitized PNG and JPEG output.
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Regenerate both the encoded inputs and sanitized outputs whenever Android `Bitmap.compress` behavior or `AndroidMediaSanitizer` changes. Do not update only the sanitized files, because the tests cover the exact encoder-to-sanitizer boundary.
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