import java.awt.Graphics2D;
import java.awt.font.FontRenderContext;
import java.awt.font.GlyphVector;
+import java.awt.geom.Rectangle2D;
import java.util.LinkedList;
import java.util.List;
import com.ibm.icu.lang.UScriptRun;
import android.graphics.Paint_Delegate.FontInfo;
+import android.graphics.RectF;;
/**
* Render the text by breaking it into various scripts and using the right font for each script.
}
}
- /* package */ Graphics2D graphics;
- /* package */ Paint_Delegate paint;
- /* package */ char[] text;
+ private Graphics2D graphics;
+ private Paint_Delegate paint;
+ private char[] text;
+ // Bounds of the text drawn so far.
+ private RectF bounds;
/**
* @param graphics May be null.
* @param x The x-coordinate of the left edge of where the text should be drawn on the given
* graphics.
* @param y The y-coordinate at which to draw the text on the given graphics.
- * @return The x-coordinate of the right edge of the drawn text. In other words,
- * x + the width of the text.
+ * @return A rectangle specifying the bounds of the text drawn.
*/
- /* package */ float renderText(int start, int limit, boolean isRtl, float advances[],
+ /* package */ RectF renderText(int start, int limit, boolean isRtl, float advances[],
int advancesIndex, boolean draw, float x, float y) {
// We break the text into scripts and then select font based on it and then render each of
// the script runs.
+ bounds = new RectF(x, y, x, y);
for (ScriptRun run : getScriptRuns(text, start, limit, isRtl, paint.getFonts())) {
int flag = Font.LAYOUT_NO_LIMIT_CONTEXT | Font.LAYOUT_NO_START_CONTEXT;
flag |= isRtl ? Font.LAYOUT_RIGHT_TO_LEFT : Font.LAYOUT_LEFT_TO_RIGHT;
- x = renderScript(run.start, run.limit, run.font, flag, advances, advancesIndex, draw,
- x, y);
+ renderScript(run.start, run.limit, run.font, flag, advances, advancesIndex, draw);
advancesIndex += run.limit - run.start;
}
- return x;
+ return bounds;
}
/**
- * Render a script run. Use the preferred font to render as much as possible. This also
- * implements a fallback mechanism to render characters that cannot be drawn using the
- * preferred font.
- *
- * @return x + width of the text drawn.
+ * Render a script run to the right of the bounds passed. Use the preferred font to render as
+ * much as possible. This also implements a fallback mechanism to render characters that cannot
+ * be drawn using the preferred font.
*/
- private float renderScript(int start, int limit, FontInfo preferredFont, int flag,
- float advances[], int advancesIndex, boolean draw, float x, float y) {
+ private void renderScript(int start, int limit, FontInfo preferredFont, int flag,
+ float advances[], int advancesIndex, boolean draw) {
List<FontInfo> fonts = paint.getFonts();
if (fonts == null || preferredFont == null) {
- return x;
+ return;
}
while (start < limit) {
boolean foundFont = false;
int canDisplayUpTo = preferredFont.mFont.canDisplayUpTo(text, start, limit);
if (canDisplayUpTo == -1) {
- return render(start, limit, preferredFont, flag, advances, advancesIndex, draw,
- x, y);
+ // We can draw all characters in the text.
+ render(start, limit, preferredFont, flag, advances, advancesIndex, draw);
+ return;
} else if (canDisplayUpTo > start) { // can draw something
- x = render(start, canDisplayUpTo, preferredFont, flag, advances, advancesIndex,
- draw, x, y);
+ render(start, canDisplayUpTo, preferredFont, flag, advances, advancesIndex, draw);
advancesIndex += canDisplayUpTo - start;
start = canDisplayUpTo;
}
+ // The current character cannot be drawn with the preferred font. Cycle through all the
+ // fonts to check which one can draw it.
int charCount = Character.isHighSurrogate(text[start]) ? 2 : 1;
for (FontInfo font : fonts) {
canDisplayUpTo = font.mFont.canDisplayUpTo(text, start, start + charCount);
if (canDisplayUpTo == -1) {
- x = render(start, start+charCount, font, flag, advances, advancesIndex, draw,
- x, y);
+ render(start, start+charCount, font, flag, advances, advancesIndex, draw);
start += charCount;
advancesIndex += charCount;
foundFont = true;
// probably appear as a box or a blank space. We could, probably, use some
// heuristics and break the character into the base character and diacritics and
// then draw it, but it's probably not worth the effort.
- x = render(start, start + charCount, preferredFont, flag, advances, advancesIndex,
- draw, x, y);
+ render(start, start + charCount, preferredFont, flag, advances, advancesIndex,
+ draw);
start += charCount;
advancesIndex += charCount;
}
}
- return x;
}
/**
- * Render the text with the given font.
+ * Render the text with the given font to the right of the bounds passed.
*/
- private float render(int start, int limit, FontInfo font, int flag, float advances[],
- int advancesIndex, boolean draw, float x, float y) {
+ private void render(int start, int limit, FontInfo font, int flag, float advances[],
+ int advancesIndex, boolean draw) {
- float totalAdvance = 0;
// Since the metrics don't have anti-aliasing set, we create a new FontRenderContext with
// the anti-aliasing set.
FontRenderContext f = font.mMetrics.getFontRenderContext();
int adv_idx = advancesIndex + ci[i];
advances[adv_idx] += adv;
}
- totalAdvance += adv;
}
if (draw && graphics != null) {
- graphics.drawGlyphVector(gv, x, y);
+ graphics.drawGlyphVector(gv, bounds.right, bounds.bottom);
}
- return x + totalAdvance;
+ Rectangle2D awtBounds = gv.getVisualBounds();
+ RectF visualBounds = awtRectToAndroidRect(awtBounds, bounds.right, bounds.bottom);
+ // If the width of the bounds is zero, no text has been drawn yet. Hence, use the
+ // coordinates from the bounds as an offset only.
+ if (Math.abs(bounds.right - bounds.left) == 0) {
+ bounds = visualBounds;
+ } else {
+ bounds.union(visualBounds);
+ }
+ }
+
+ private RectF awtRectToAndroidRect(Rectangle2D awtRec, float offsetX, float offsetY) {
+ float left = (float) awtRec.getX();
+ float top = (float) awtRec.getY();
+ float right = (float) (left + awtRec.getWidth());
+ float bottom = (float) (top + awtRec.getHeight());
+ RectF androidRect = new RectF(left, top, right, bottom);
+ androidRect.offset(offsetX, offsetY);
+ return androidRect;
}
// --- Static helper methods ---
return 0;
}
- return delegate.measureText(text, index, count, isRtl(bidiFlags));
+ RectF bounds = delegate.measureText(text, index, count, isRtl(bidiFlags));
+ return bounds.right - bounds.left;
}
@LayoutlibDelegate
}
// measure from start to end
- float res = delegate.measureText(text, start, end - start + 1, isRtl(bidiFlags));
+ RectF bounds = delegate.measureText(text, start, end - start + 1, isRtl(bidiFlags));
+ float res = bounds.right - bounds.left;
if (measuredWidth != null) {
measuredWidth[measureIndex] = res;
boolean isRtl = isRtl(flags);
int limit = index + count;
- return new BidiRenderer(null, delegate, text).renderText(
+ RectF bounds = new BidiRenderer(null, delegate, text).renderText(
index, limit, isRtl, advances, advancesIndex, false, 0, 0);
+ return bounds.right - bounds.left;
}
@LayoutlibDelegate
if (delegate == null || delegate.mFonts == null || delegate.mFonts.size() == 0) {
return;
}
- int w = (int) delegate.measureText(text, index, count, isRtl(bidiFlags));
- int h= delegate.getFonts().get(0).mMetrics.getHeight();
- bounds.set(0, 0, w, h);
+ delegate.measureText(text, index, count, isRtl(bidiFlags)).roundOut(bounds);
}
@LayoutlibDelegate
}
}
- /*package*/ float measureText(char[] text, int index, int count, boolean isRtl) {
+ /*package*/ RectF measureText(char[] text, int index, int count, boolean isRtl) {
return new BidiRenderer(null, this, text).renderText(
index, index + count, isRtl, null, 0, false, 0, 0);
}
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