Sponsor heart: render sponsor.png with a moving shimmer highlight

- Bundle the GhostCloud sponsor.png as drawable-nodpi/foxsponsor_heart.png
- Draw the artwork and sweep a glossy highlight band across it, masked to
  the heart shape via the bitmap alpha (DST_IN), so it shimmers again

TMessagesProj/src/main/java/tw/nekomimi/nekogram/helpers/ShimmerHeartDrawable.java

@@ -1,24 +1,31 @@
 package tw.nekomimi.nekogram.helpers;
 
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
 import android.graphics.Canvas;
 import android.graphics.ColorFilter;
+import android.graphics.LinearGradient;
+import android.graphics.Matrix;
 import android.graphics.Paint;
-import android.graphics.Path;
 import android.graphics.PixelFormat;
-import android.graphics.RadialGradient;
+import android.graphics.PorterDuff;
+import android.graphics.PorterDuffXfermode;
 import android.graphics.Rect;
+import android.graphics.RectF;
 import android.graphics.Shader;
 import android.graphics.drawable.Drawable;
 
 import androidx.annotation.NonNull;
 
 import org.telegram.messenger.AndroidUtilities;
+import org.telegram.messenger.ApplicationLoader;
+import org.telegram.messenger.R;
 
 /**
- * A soft, airbrushed 3D heart badge matching the GhostCloud "sponsor.png":
- * violet in the upper-left, blue through the centre, warm orange/coral on the
- * right and bottom, all blended smoothly with a gentle glossy highlight. The
- * colour blobs drift slightly so the badge subtly shimmers.
+ * Sponsor badge that renders the GhostCloud "sponsor.png" heart and overlays a
+ * moving glossy highlight ("shimmer") that is clipped to the artwork's shape
+ * via its alpha channel, so it looks like light sweeping across the heart.
  *
  * It self-invalidates each frame, so when attached to a view via
  * {@code setRightDrawable(...)} / {@code setRightDrawable2(...)} the host keeps
@@ -27,15 +34,18 @@ import org.telegram.messenger.AndroidUtilities;
  */
 public class ShimmerHeartDrawable extends Drawable {
 
-    private final Paint basePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
-    private final Paint blobPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
-    private final Paint highlightPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
-    private final Path heart = new Path();
+    private static Bitmap sharedBitmap;
 
-    private int lastWidth = -1;
-    private int lastHeight = -1;
+    private final Paint bitmapPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);
+    private final Paint shinePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
+    private final Paint maskPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);
+    private final Matrix shineMatrix = new Matrix();
 
-    private static final long CYCLE_MS = 5200L;
+    private final Bitmap bitmap;
+    private LinearGradient shineGradient;
+    private int shineWidth;
+
+    private static final long CYCLE_MS = 2600L;
     private final int size;
 
     public ShimmerHeartDrawable() {
@@ -44,98 +54,70 @@ public class ShimmerHeartDrawable extends Drawable {
 
     public ShimmerHeartDrawable(int sizePx) {
         this.size = sizePx;
-        basePaint.setStyle(Paint.Style.FILL);
-        blobPaint.setStyle(Paint.Style.FILL);
-        highlightPaint.setStyle(Paint.Style.FILL);
+        bitmap = loadBitmap();
+        // The moving highlight is drawn only where the artwork is opaque.
+        maskPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));
     }
 
-    private void buildHeart(Rect b) {
-        heart.reset();
-        float w = b.width();
-        float h = b.height();
-        float l = b.left;
-        float t = b.top;
-        float cx = l + w / 2f;
-        heart.moveTo(cx, t + h * 0.30f);
-        heart.cubicTo(l + w * 0.40f, t + h * 0.05f, l + w * 0.02f, t + h * 0.18f, l + w * 0.10f, t + h * 0.45f);
-        heart.cubicTo(l + w * 0.17f, t + h * 0.66f, l + w * 0.40f, t + h * 0.80f, cx, t + h * 0.97f);
-        heart.cubicTo(l + w * 0.60f, t + h * 0.80f, l + w * 0.83f, t + h * 0.66f, l + w * 0.90f, t + h * 0.45f);
-        heart.cubicTo(l + w * 0.98f, t + h * 0.18f, l + w * 0.60f, t + h * 0.05f, cx, t + h * 0.30f);
-        heart.close();
+    private static Bitmap loadBitmap() {
+        if (sharedBitmap == null || sharedBitmap.isRecycled()) {
+            try {
+                Context ctx = ApplicationLoader.applicationContext;
+                BitmapFactory.Options opts = new BitmapFactory.Options();
+                opts.inScaled = false;
+                sharedBitmap = BitmapFactory.decodeResource(ctx.getResources(), R.drawable.foxsponsor_heart, opts);
+            } catch (Throwable ignore) {
+            }
+        }
+        return sharedBitmap;
     }
 
-    /** A soft circular blob of one colour fading to transparent. */
-    private void drawBlob(Canvas canvas, float cx, float cy, float r, int color) {
-        blobPaint.setShader(new RadialGradient(
-                cx, cy, Math.max(1f, r),
-                new int[]{color, color & 0x00FFFFFF},
-                new float[]{0f, 1f},
-                Shader.TileMode.CLAMP));
-        canvas.drawRect(getBounds(), blobPaint);
-    }
-
-    @Override
-    protected void onBoundsChange(@NonNull Rect bounds) {
-        super.onBoundsChange(bounds);
-        buildHeart(bounds);
-        lastWidth = bounds.width();
-        lastHeight = bounds.height();
+    private void buildShine(int w) {
+        // A bright diagonal band, narrow relative to the badge width.
+        shineWidth = Math.max(1, (int) (w * 0.55f));
+        shineGradient = new LinearGradient(
+                0, 0, shineWidth, 0,
+                new int[]{0x00FFFFFF, 0x00FFFFFF, 0x99FFFFFF, 0x00FFFFFF, 0x00FFFFFF},
+                new float[]{0f, 0.35f, 0.5f, 0.65f, 1f},
+                Shader.TileMode.CLAMP);
+        shinePaint.setShader(shineGradient);
     }
 
     @Override
     public void draw(@NonNull Canvas canvas) {
         Rect b = getBounds();
-        if (b.width() == 0 || b.height() == 0) {
+        if (b.width() == 0 || b.height() == 0 || bitmap == null) {
             return;
         }
-        if (lastWidth != b.width() || lastHeight != b.height()) {
-            buildHeart(b);
-            lastWidth = b.width();
-            lastHeight = b.height();
+        if (shineGradient == null || shineWidth != (int) (b.width() * 0.55f)) {
+            buildShine(b.width());
         }
 
-        float w = b.width();
-        float h = b.height();
-        float l = b.left;
-        float t = b.top;
+        RectF dst = new RectF(b);
 
-        // Subtle drift so the colours softly shimmer.
+        // Layer so the shimmer can be masked against the artwork alpha.
+        int sc = canvas.saveLayer(dst, null);
+
+        // 1) the heart artwork
+        canvas.drawBitmap(bitmap, null, dst, bitmapPaint);
+
+        // 2) moving highlight band, swept diagonally
         float phase = (System.currentTimeMillis() % CYCLE_MS) / (float) CYCLE_MS;
-        double a = phase * 2 * Math.PI;
-        float dx = (float) Math.cos(a) * w * 0.05f;
-        float dy = (float) Math.sin(a) * h * 0.05f;
+        float travel = b.width() + shineWidth;
+        float x = b.left - shineWidth + phase * travel;
+        shineMatrix.reset();
+        // slight diagonal slant
+        shineMatrix.postRotate(20f, 0, 0);
+        shineMatrix.postTranslate(x, b.top);
+        shineGradient.setLocalMatrix(shineMatrix);
 
-        int save = canvas.save();
-        canvas.clipPath(heart);
+        int ssc = canvas.saveLayer(dst, null);
+        canvas.drawRect(dst, shinePaint);
+        // keep the highlight only where the artwork is opaque
+        canvas.drawBitmap(bitmap, null, dst, maskPaint);
+        canvas.restoreToCount(ssc);
 
-        // Light lavender base so blends stay airy.
-        basePaint.setShader(null);
-        basePaint.setColor(0xFFB9A8F0);
-        canvas.drawRect(b, basePaint);
-
-        // Soft overlapping colour blobs (airbrushed look).
-        // Violet — upper-left.
-        drawBlob(canvas, l + w * (0.30f) + dx, t + h * (0.28f) + dy, w * 0.62f, 0xFF7A2FE0);
-        // Blue — centre-left.
-        drawBlob(canvas, l + w * (0.40f) - dx, t + h * (0.55f) + dy, w * 0.55f, 0xFF4F6BFF);
-        // Cyan/blue glow — centre.
-        drawBlob(canvas, l + w * (0.52f) + dy, t + h * (0.45f) - dx, w * 0.42f, 0xCC59B7FF);
-        // Warm orange — right.
-        drawBlob(canvas, l + w * (0.82f) - dx, t + h * (0.40f) - dy, w * 0.60f, 0xFFFF9A3D);
-        // Coral/pink — bottom-right.
-        drawBlob(canvas, l + w * (0.70f) + dx, t + h * (0.80f) + dy, w * 0.55f, 0xFFFF7E5A);
-        // Deep violet — bottom-left corner for contrast.
-        drawBlob(canvas, l + w * (0.22f) + dx, t + h * (0.82f) - dy, w * 0.45f, 0xCC6A2BC8);
-
-        // Gentle glossy highlight, upper-centre.
-        highlightPaint.setShader(new RadialGradient(
-                l + w * 0.45f + dx, t + h * 0.30f + dy, w * 0.40f,
-                new int[]{0x80FFFFFF, 0x00FFFFFF},
-                new float[]{0f, 1f},
-                Shader.TileMode.CLAMP));
-        canvas.drawRect(b, highlightPaint);
-
-        canvas.restoreToCount(save);
+        canvas.restoreToCount(sc);
 
         invalidateSelf();
     }
@@ -152,12 +134,12 @@ public class ShimmerHeartDrawable extends Drawable {
 
     @Override
     public void setAlpha(int alpha) {
-        basePaint.setAlpha(alpha);
+        bitmapPaint.setAlpha(alpha);
     }
 
     @Override
     public void setColorFilter(ColorFilter colorFilter) {
-        basePaint.setColorFilter(colorFilter);
+        bitmapPaint.setColorFilter(colorFilter);
     }
 
     @Override