add paint::getFontBounds()

src/core/SkPaint.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPaint.h"
 #include "SkAnnotation.h"
 #include "SkAutoKern.h"
@@ skipping 1219 matching lines @@
     while (iter.next(&iterPath, NULL)) {
         matrix.postTranslate(pos[i].fX - prevPos.fX, pos[i].fY - prevPos.fY);
         if (iterPath) {
             path->addPath(*iterPath, matrix);
         }
         prevPos = pos[i];
         i++;
     }
 }
 
+SkRect SkPaint::getFontBounds() const {
+    SkMatrix m;
+    m.setScale(fTextSize * fTextScaleX, fTextSize);
+    m.postSkew(fTextSkewX, 0);
+
+    SkTypeface* typeface = this->getTypeface();
+    if (NULL == typeface) {
+        typeface = SkTypeface::GetDefaultTypeface();
+    }
+
+    SkRect bounds;
+    m.mapRect(&bounds, typeface->getBounds());
+    return bounds;
+}
+
 static void add_flattenable(SkDescriptor* desc, uint32_t tag,
                             SkWriteBuffer* buffer) {
     buffer->writeToMemory(desc->addEntry(tag, buffer->bytesWritten(), NULL));
 }
 
 // SkFontHost can override this choice in FilterRec()
 static SkMask::Format computeMaskFormat(const SkPaint& paint) {
     uint32_t flags = paint.getFlags();
 
     // Antialiasing being disabled trumps all other settings.
@@ skipping 1119 matching lines @@
 }
 
 uint32_t SkPaint::getHash() const {
     // We're going to hash 10 pointers and 7 32-bit values, finishing up with fBitfields,
     // so fBitfields should be 10 pointers and 6 32-bit values from the start.
     SK_COMPILE_ASSERT(offsetof(SkPaint, fBitfields) == 10 * sizeof(void*) + 6 * sizeof(uint32_t),
                       SkPaint_notPackedTightly);
     return SkChecksum::Murmur3(reinterpret_cast<const uint32_t*>(this),
                                offsetof(SkPaint, fBitfields) + sizeof(fBitfields));
 }