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Add elegantTextHeight text appearance attribute

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This patch adds an elegantTextHeight text appearance attribute and
plumbs it through to the paint. This attribute selects the elegant
variant of fonts (when appropriate, which is typically Arabic and indic
scripts), and also specifies larger vertical metrics, to avoid clipping.

The intent is for this to be the default for quantum themes, but this
patch doesn't change any default behavior, just adds the attribute.

The larger vertical metrics are applied to top and bottom, but should
not affect line spacing in the common case. Also, with the setting,
metrics are no longer dependent on the font, so setting a custom font
will preserve layout and spacing.

Change-Id: If3b7d41f141deff50ca078f479ca90c2aa07829a
This commit is contained in:
Raph Levien
2014-04-14 14:11:02 -07:00
parent 31e052bfc4
commit 53c0077256
5 changed files with 92 additions and 2 deletions
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3
api/current.txt
View File

@@ -10035,6 +10035,7 @@ package android.graphics {
method public android.graphics.Xfermode getXfermode();
method public final boolean isAntiAlias();
method public final boolean isDither();
method public boolean isElegantTextHeight();
method public final boolean isFakeBoldText();
method public final boolean isFilterBitmap();
method public final boolean isLinearText();
@@ -10053,6 +10054,7 @@ package android.graphics {
method public void setColor(int);
method public android.graphics.ColorFilter setColorFilter(android.graphics.ColorFilter);
method public void setDither(boolean);
method public void setElegantTextHeight(boolean);
method public void setFakeBoldText(boolean);
method public void setFilterBitmap(boolean);
method public void setFlags(int);
@@ -34903,6 +34905,7 @@ package android.widget {
method public void setCursorVisible(boolean);
method public void setCustomSelectionActionModeCallback(android.view.ActionMode.Callback);
method public final void setEditableFactory(android.text.Editable.Factory);
method public void setElegantTextHeight(boolean);
method public void setEllipsize(android.text.TextUtils.TruncateAt);
method public void setEms(int);
method public void setError(java.lang.CharSequence);

26
core/java/android/widget/TextView.java
View File

@@ -652,6 +652,7 @@ public class TextView extends View implements ViewTreeObserver.OnPreDrawListener
boolean allCaps = false;
int shadowcolor = 0;
float dx = 0, dy = 0, r = 0;
boolean elegant = false;
final Resources.Theme theme = context.getTheme();
@@ -728,6 +729,10 @@ public class TextView extends View implements ViewTreeObserver.OnPreDrawListener
case com.android.internal.R.styleable.TextAppearance_shadowRadius:
r = appearance.getFloat(attr, 0);
break;
case com.android.internal.R.styleable.TextAppearance_elegantTextHeight:
elegant = appearance.getBoolean(attr, false);
break;
}
}
@@ -1065,6 +1070,10 @@ public class TextView extends View implements ViewTreeObserver.OnPreDrawListener
case com.android.internal.R.styleable.TextView_textAllCaps:
allCaps = a.getBoolean(attr, false);
break;
case com.android.internal.R.styleable.TextView_elegantTextHeight:
elegant = a.getBoolean(attr, false);
break;
}
}
a.recycle();
@@ -1245,6 +1254,7 @@ public class TextView extends View implements ViewTreeObserver.OnPreDrawListener
setHighlightColor(textColorHighlight);
}
setRawTextSize(textSize);
setElegantTextHeight(elegant);
if (allCaps) {
setTransformationMethod(new AllCapsTransformationMethod(getContext()));
@@ -2468,6 +2478,11 @@ public class TextView extends View implements ViewTreeObserver.OnPreDrawListener
setTransformationMethod(new AllCapsTransformationMethod(getContext()));
}
if (appearance.hasValue(com.android.internal.R.styleable.TextAppearance_elegantTextHeight)) {
setElegantTextHeight(appearance.getBoolean(
com.android.internal.R.styleable.TextAppearance_elegantTextHeight, false));
}
appearance.recycle();
}
@@ -2614,6 +2629,17 @@ public class TextView extends View implements ViewTreeObserver.OnPreDrawListener
return mTextPaint.getTypeface();
}
/**
* Set the TextView's elegant height metrics flag. This setting selects font
* variants that have not been compacted to fit Latin-based vertical
* metrics, and also increases top and bottom bounds to provide more space.
*
* @param elegant set the paint's elegant metrics flag.
*/
public void setElegantTextHeight(boolean elegant) {
mTextPaint.setElegantTextHeight(elegant);
}
/**
* Sets the text color for all the states (normal, selected,
* focused) to be this color.

44
core/jni/android/graphics/Paint.cpp
View File

@@ -357,6 +357,24 @@ public:
obj->setPaintOptionsAndroid(paintOpts);
}
static jboolean isElegantTextHeight(JNIEnv* env, jobject paint) {
NPE_CHECK_RETURN_ZERO(env, paint);
SkPaint* obj = GraphicsJNI::getNativePaint(env, paint);
SkPaintOptionsAndroid paintOpts = obj->getPaintOptionsAndroid();
return paintOpts.getFontVariant() == SkPaintOptionsAndroid::kElegant_Variant;
}
static void setElegantTextHeight(JNIEnv* env, jobject paint, jboolean aa) {
NPE_CHECK_RETURN_VOID(env, paint);
SkPaint* obj = GraphicsJNI::getNativePaint(env, paint);
SkPaintOptionsAndroid::FontVariant variant =
aa ? SkPaintOptionsAndroid::kElegant_Variant :
SkPaintOptionsAndroid::kDefault_Variant;
SkPaintOptionsAndroid paintOpts = obj->getPaintOptionsAndroid();
paintOpts.setFontVariant(variant);
obj->setPaintOptionsAndroid(paintOpts);
}
static jfloat getTextSize(JNIEnv* env, jobject paint) {
NPE_CHECK_RETURN_ZERO(env, paint);
return SkScalarToFloat(GraphicsJNI::getNativePaint(env, paint)->getTextSize());
@@ -401,10 +419,30 @@ public:
return SkScalarToFloat(metrics.fDescent);
}
static SkScalar getMetricsInternal(SkPaint *paint, SkPaint::FontMetrics *metrics) {
const int kElegantTop = 2500;
const int kElegantBottom = -1000;
const int kElegantAscent = 1946;
const int kElegantDescent = -512;
const int kElegantLeading = 0;
SkScalar spacing = paint->getFontMetrics(metrics);
SkPaintOptionsAndroid paintOpts = paint->getPaintOptionsAndroid();
if (paintOpts.getFontVariant() == SkPaintOptionsAndroid::kElegant_Variant) {
SkScalar size = paint->getTextSize();
metrics->fTop = -size * kElegantTop / 2048;
metrics->fBottom = -size * kElegantBottom / 2048;
metrics->fAscent = -size * kElegantAscent / 2048;
metrics->fDescent = -size * kElegantDescent / 2048;
metrics->fLeading = size * kElegantLeading / 2048;
spacing = metrics->fDescent - metrics->fAscent + metrics->fLeading;
}
return spacing;
}
static jfloat getFontMetrics(JNIEnv* env, jobject paint, jobject metricsObj) {
NPE_CHECK_RETURN_ZERO(env, paint);
SkPaint::FontMetrics metrics;
SkScalar spacing = GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
SkScalar spacing = getMetricsInternal(GraphicsJNI::getNativePaint(env, paint), &metrics);
if (metricsObj) {
SkASSERT(env->IsInstanceOf(metricsObj, gFontMetrics_class));
@@ -421,7 +459,7 @@ public:
NPE_CHECK_RETURN_ZERO(env, paint);
SkPaint::FontMetrics metrics;
GraphicsJNI::getNativePaint(env, paint)->getFontMetrics(&metrics);
getMetricsInternal(GraphicsJNI::getNativePaint(env, paint), &metrics);
int ascent = SkScalarRoundToInt(metrics.fAscent);
int descent = SkScalarRoundToInt(metrics.fDescent);
int leading = SkScalarRoundToInt(metrics.fLeading);
@@ -894,6 +932,8 @@ static JNINativeMethod methods[] = {
{"native_getTextAlign","(J)I", (void*) SkPaintGlue::getTextAlign},
{"native_setTextAlign","(JI)V", (void*) SkPaintGlue::setTextAlign},
{"native_setTextLocale","(JLjava/lang/String;)V", (void*) SkPaintGlue::setTextLocale},
{"isElegantTextHeight","()Z", (void*) SkPaintGlue::isElegantTextHeight},
{"setElegantTextHeight","(Z)V", (void*) SkPaintGlue::setElegantTextHeight},
{"getTextSize","()F", (void*) SkPaintGlue::getTextSize},
{"setTextSize","(F)V", (void*) SkPaintGlue::setTextSize},
{"getTextScaleX","()F", (void*) SkPaintGlue::getTextScaleX},

4
core/res/res/values/attrs.xml
View File

@@ -3357,6 +3357,8 @@
<attr name="shadowDy" format="float" />
<!-- Radius of the shadow. -->
<attr name="shadowRadius" format="float" />
<!-- Elegant text height, especially for less compacted complex script text. -->
<attr name="elegantTextHeight" format="boolean" />
</declare-styleable>
<declare-styleable name="TextClock">
<!-- Specifies the formatting pattern used to show the time and/or date
@@ -3648,6 +3650,8 @@
<attr name="textIsSelectable" />
<!-- Present the text in ALL CAPS. This may use a small-caps form when available. -->
<attr name="textAllCaps" />
<!-- Elegant text height, especially for less compacted complex script text. -->
<attr name="elegantTextHeight" />
</declare-styleable>
<declare-styleable name="TextViewAppearance">
<!-- Base text color, typeface, size, and style. -->

17
graphics/java/android/graphics/Paint.java
View File

@@ -500,6 +500,7 @@ public class Paint {
mBidiFlags = BIDI_DEFAULT_LTR;
setTextLocale(Locale.getDefault());
setElegantTextHeight(false);
}
/**
@@ -1220,6 +1221,22 @@ public class Paint {
native_setTextLocale(mNativePaint, locale.toString());
}
/**
* Get the elegant metrics flag.
*
* @return true if elegant metrics are enabled for text drawing.
*/
public native boolean isElegantTextHeight();
/**
* Set the paint's elegant height metrics flag. This setting selects font
* variants that have not been compacted to fit Latin-based vertical
* metrics, and also increases top and bottom bounds to provide more space.
*
* @param elegant set the paint's elegant metrics flag for drawing text.
*/
public native void setElegantTextHeight(boolean elegant);
/**
* Return the paint's text size.
*