87b8ea4949
- Add BlurredTextSpan: draws the real glyphs through a BlurMaskFilter into a cached offscreen bitmap, so the blur works on both software and hardware-accelerated views - formatOwnPhone() now returns this span in Blur mode instead of replacing digits with bullets - SettingsActivity header builds the subtitle with a SpannableStringBuilder so the span is preserved
109 lines
3.6 KiB
Java
109 lines
3.6 KiB
Java
package tw.nekomimi.nekogram.helpers;
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import android.graphics.Bitmap;
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import android.graphics.BlurMaskFilter;
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import android.graphics.Canvas;
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import android.graphics.Paint;
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import android.text.style.ReplacementSpan;
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import androidx.annotation.NonNull;
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import androidx.annotation.Nullable;
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import org.telegram.messenger.AndroidUtilities;
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/**
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* Renders a piece of text genuinely blurred (Gaussian-style), instead of just
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* masking the characters. The real glyphs are drawn into an offscreen software
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* bitmap with a {@link BlurMaskFilter} applied and then blitted onto the target
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* canvas, so it works the same on both software and hardware-accelerated views.
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*/
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public class BlurredTextSpan extends ReplacementSpan {
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private final String text;
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private final float blurRadius;
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private Bitmap cache;
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private int cacheWidth;
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private int cacheHeight;
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private float cacheTextSize;
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private int cacheColor;
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private float cacheBaseline;
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private int cachePad;
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public BlurredTextSpan(String text) {
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this(text, AndroidUtilities.dp(3.5f));
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}
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public BlurredTextSpan(String text, float blurRadius) {
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this.text = text == null ? "" : text;
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this.blurRadius = Math.max(0.5f, blurRadius);
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}
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@Override
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public int getSize(@NonNull Paint paint, CharSequence charSequence, int start, int end, @Nullable Paint.FontMetricsInt fm) {
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if (fm != null) {
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Paint.FontMetricsInt pfm = paint.getFontMetricsInt();
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fm.ascent = pfm.ascent;
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fm.descent = pfm.descent;
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fm.top = pfm.top;
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fm.bottom = pfm.bottom;
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fm.leading = pfm.leading;
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}
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return (int) Math.ceil(paint.measureText(text));
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}
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@Override
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public void draw(@NonNull Canvas canvas, CharSequence charSequence, int start, int end, float x, int top, int y, int bottom, @NonNull Paint paint) {
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ensureCache(paint);
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if (cache == null) {
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return;
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}
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canvas.drawBitmap(cache, x - cachePad, y - cacheBaseline, null);
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}
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private void ensureCache(Paint paint) {
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final float textSize = paint.getTextSize();
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final int color = paint.getColor();
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final int width = (int) Math.ceil(paint.measureText(text));
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if (width <= 0) {
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cache = null;
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return;
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}
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// padding so the blur isn't clipped at the edges
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final int pad = (int) Math.ceil(blurRadius * 2.5f);
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Paint.FontMetricsInt fm = paint.getFontMetricsInt();
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final int textHeight = fm.descent - fm.ascent;
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final int w = width + pad * 2;
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final int h = textHeight + pad * 2;
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if (cache != null && cacheWidth == w && cacheHeight == h
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&& cacheTextSize == textSize && cacheColor == color) {
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return;
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}
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if (cache != null) {
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cache.recycle();
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}
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try {
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cache = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
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} catch (Throwable e) {
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cache = null;
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return;
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}
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cacheWidth = w;
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cacheHeight = h;
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cacheTextSize = textSize;
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cacheColor = color;
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cachePad = pad;
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// baseline offset inside the cache bitmap, relative to the text top
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cacheBaseline = pad - fm.ascent;
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Canvas c = new Canvas(cache);
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Paint p = new Paint(Paint.ANTI_ALIAS_FLAG);
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p.setTextSize(textSize);
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p.setColor(color);
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p.setTypeface(paint.getTypeface());
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p.setMaskFilter(new BlurMaskFilter(blurRadius, BlurMaskFilter.Blur.NORMAL));
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c.drawText(text, pad, cacheBaseline, p);
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}
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}
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