src/core/SkBBoxRecord.cpp - skia - Git at Google


 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include "SkBBoxRecord.h"
 #include "SkPatchUtils.h"

 SkBBoxRecord::~SkBBoxRecord() {
     fSaveStack.deleteAll();
 }

 void SkBBoxRecord::drawOval(const SkRect& rect, const SkPaint& paint) {
     if (this->transformBounds(rect, &paint)) {
         INHERITED::drawOval(rect, paint);
     }
 }

 void SkBBoxRecord::drawRRect(const SkRRect& rrect, const SkPaint& paint) {
     if (this->transformBounds(rrect.rect(), &paint)) {
         INHERITED::drawRRect(rrect, paint);
     }
 }

 void SkBBoxRecord::drawRect(const SkRect& rect, const SkPaint& paint) {
     if (this->transformBounds(rect, &paint)) {
         INHERITED::drawRect(rect, paint);
     }
 }

 void SkBBoxRecord::onDrawDRRect(const SkRRect& outer, const SkRRect& inner,
                                 const SkPaint& paint) {
     if (this->transformBounds(outer.rect(), &paint)) {
         this->INHERITED::onDrawDRRect(outer, inner, paint);
     }
 }

 void SkBBoxRecord::drawPath(const SkPath& path, const SkPaint& paint) {
     if (path.isInverseFillType()) {
         // If path is inverse filled, use the current clip bounds as the
         // path's device-space bounding box.
         SkIRect clipBounds;
         if (this->getClipDeviceBounds(&clipBounds)) {
             this->handleBBox(SkRect::Make(clipBounds));
             INHERITED::drawPath(path, paint);
         }
     } else if (this->transformBounds(path.getBounds(), &paint)) {
         INHERITED::drawPath(path, paint);
     }
 }

 void SkBBoxRecord::drawPoints(PointMode mode, size_t count, const SkPoint pts[],
                               const SkPaint& paint) {
     SkRect bbox;
     bbox.set(pts, SkToInt(count));
     // Small min width value, just to ensure hairline point bounding boxes aren't empty.
     // Even though we know hairline primitives are drawn one pixel wide, we do not use a
     // minimum of 1 because the playback scale factor is unknown at record time. Later
     // outsets will take care of adding additional padding for antialiasing and rounding out
     // to integer device coordinates, guaranteeing that the rasterized pixels will be included
     // in the computed bounds.
     // Note: The device coordinate outset in SkBBoxHierarchyRecord::handleBBox is currently
     // done in the recording coordinate space, which is wrong.
     // http://code.google.com/p/skia/issues/detail?id=1021
     static const SkScalar kMinWidth = 0.01f;
     SkScalar halfStrokeWidth = SkMaxScalar(paint.getStrokeWidth(), kMinWidth) / 2;
     bbox.outset(halfStrokeWidth, halfStrokeWidth);
     if (this->transformBounds(bbox, &paint)) {
         INHERITED::drawPoints(mode, count, pts, paint);
     }
 }

 void SkBBoxRecord::drawPaint(const SkPaint& paint) {
     SkRect bbox;
     if (this->getClipBounds(&bbox)) {
         if (this->transformBounds(bbox, &paint)) {
             INHERITED::drawPaint(paint);
         }
     }
 }

 void SkBBoxRecord::clear(SkColor color) {
     SkISize size = this->getDeviceSize();
     SkRect bbox = {0, 0, SkIntToScalar(size.width()), SkIntToScalar(size.height())};
     this->handleBBox(bbox);
     INHERITED::clear(color);
 }

 void SkBBoxRecord::onDrawText(const void* text, size_t byteLength, SkScalar x, SkScalar y,
                               const SkPaint& paint) {
     SkRect bbox;
     paint.measureText(text, byteLength, &bbox);
     SkPaint::FontMetrics metrics;
     paint.getFontMetrics(&metrics);

     // Vertical and aligned text need to be offset
     if (paint.isVerticalText()) {
         SkScalar h = bbox.fBottom - bbox.fTop;
         if (paint.getTextAlign() == SkPaint::kCenter_Align) {
             bbox.fTop    -= h / 2;
             bbox.fBottom -= h / 2;
         }
         // Pad top and bottom with max extents from FontMetrics
         bbox.fBottom += metrics.fBottom;
         bbox.fTop += metrics.fTop;
     } else {
         SkScalar w = bbox.fRight - bbox.fLeft;
         if (paint.getTextAlign() == SkPaint::kCenter_Align) {
             bbox.fLeft  -= w / 2;
             bbox.fRight -= w / 2;
         } else if (paint.getTextAlign() == SkPaint::kRight_Align) {
             bbox.fLeft  -= w;
             bbox.fRight -= w;
         }
         // Set vertical bounds to max extents from font metrics
         bbox.fTop = metrics.fTop;
         bbox.fBottom = metrics.fBottom;
     }

     // Pad horizontal bounds on each side by half of max vertical extents (this is sort of
     // arbitrary, but seems to produce reasonable results, if there were a way of getting max
     // glyph X-extents to pad by, that may be better here, but FontMetrics fXMin and fXMax seem
     // incorrect on most platforms (too small in Linux, never even set in Windows).
     SkScalar pad = (metrics.fBottom - metrics.fTop) / 2;
     bbox.fLeft  -= pad;
     bbox.fRight += pad;

     bbox.fLeft += x;
     bbox.fRight += x;
     bbox.fTop += y;
     bbox.fBottom += y;
     if (this->transformBounds(bbox, &paint)) {
         INHERITED::onDrawText(text, byteLength, x, y, paint);
     }
 }

 void SkBBoxRecord::drawBitmap(const SkBitmap& bitmap, SkScalar left, SkScalar top,
                               const SkPaint* paint) {
     SkRect bbox = {left, top, left + bitmap.width(), top + bitmap.height()};
     if (this->transformBounds(bbox, paint)) {
         INHERITED::drawBitmap(bitmap, left, top, paint);
     }
 }

 void SkBBoxRecord::drawBitmapRectToRect(const SkBitmap& bitmap, const SkRect* src,
                                         const SkRect& dst, const SkPaint* paint,
                                         DrawBitmapRectFlags flags) {
     if (this->transformBounds(dst, paint)) {
         INHERITED::drawBitmapRectToRect(bitmap, src, dst, paint, flags);
     }
 }

 void SkBBoxRecord::drawBitmapMatrix(const SkBitmap& bitmap, const SkMatrix& mat,
                                     const SkPaint* paint) {
     SkMatrix m = mat;
     SkRect bbox = {0, 0, SkIntToScalar(bitmap.width()), SkIntToScalar(bitmap.height())};
     m.mapRect(&bbox);
     if (this->transformBounds(bbox, paint)) {
         INHERITED::drawBitmapMatrix(bitmap, mat, paint);
     }
 }

 void SkBBoxRecord::drawBitmapNine(const SkBitmap& bitmap, const SkIRect& center,
                                   const SkRect& dst, const SkPaint* paint) {
     if (this->transformBounds(dst, paint)) {
         INHERITED::drawBitmapNine(bitmap, center, dst, paint);
     }
 }

 // Hack to work-around https://code.google.com/p/chromium/issues/detail?id=373785
 // This logic assums that 'pad' is enough to add to the left and right to account for
 // big glyphs. For the font in question (a logo font) the glyphs is much wider than just
 // the pointsize (approx 3x wider).
 // As a temp work-around, we scale-up pad.
 // A more correct fix might be to add fontmetrics.fMaxX, but we don't have that value in hand
 // at the moment, and (possibly) the value in the font may not be accurate (but who knows).
 //
 static SkScalar hack_373785_amend_pad(SkScalar pad) {
     return pad * 4;
 }

 void SkBBoxRecord::onDrawPosText(const void* text, size_t byteLength, const SkPoint pos[],
                                  const SkPaint& paint) {
     SkRect bbox;
     bbox.set(pos, paint.countText(text, byteLength));
     SkPaint::FontMetrics metrics;
     paint.getFontMetrics(&metrics);
     bbox.fTop += metrics.fTop;
     bbox.fBottom += metrics.fBottom;

     // pad on left and right by half of max vertical glyph extents
     SkScalar pad = (metrics.fTop - metrics.fBottom) / 2;
     pad = hack_373785_amend_pad(pad);
     bbox.fLeft += pad;
     bbox.fRight -= pad;

     if (this->transformBounds(bbox, &paint)) {
         INHERITED::onDrawPosText(text, byteLength, pos, paint);
     }
 }

 void SkBBoxRecord::onDrawPosTextH(const void* text, size_t byteLength, const SkScalar xpos[],
                                   SkScalar constY, const SkPaint& paint) {
     size_t numChars = paint.countText(text, byteLength);
     if (numChars == 0) {
         return;
     }

     const SkFlatData* flatPaintData = this->getFlatPaintData(paint);
     WriteTopBot(paint, *flatPaintData);

     SkScalar top = flatPaintData->topBot()[0];
     SkScalar bottom = flatPaintData->topBot()[1];
     SkScalar pad = top - bottom;

     SkRect bbox;
     bbox.fLeft = SK_ScalarMax;
     bbox.fRight = SK_ScalarMin;

     for (size_t i = 0; i < numChars; ++i) {
         if (xpos[i] < bbox.fLeft) {
             bbox.fLeft = xpos[i];
         }
         if (xpos[i] > bbox.fRight) {
             bbox.fRight = xpos[i];
         }
     }

     // pad horizontally by max glyph height
     pad = hack_373785_amend_pad(pad);
     bbox.fLeft  += pad;
     bbox.fRight -= pad;

     bbox.fTop    = top + constY;
     bbox.fBottom = bottom + constY;

     if (!this->transformBounds(bbox, &paint)) {
         return;
     }
     // This is the equivalent of calling:
     //  INHERITED::drawPosTextH(text, byteLength, xpos, constY, paint);
     // but we filled our flat paint beforehand so that we could get font metrics.
     drawPosTextHImpl(text, byteLength, xpos, constY, paint, flatPaintData);
 }

 void SkBBoxRecord::drawSprite(const SkBitmap& bitmap, int left, int top,
                               const SkPaint* paint) {
     SkRect bbox;
     bbox.set(SkIRect::MakeXYWH(left, top, bitmap.width(), bitmap.height()));
     this->handleBBox(bbox); // directly call handleBBox, matrix is ignored
     INHERITED::drawSprite(bitmap, left, top, paint);
 }

 void SkBBoxRecord::onDrawTextOnPath(const void* text, size_t byteLength, const SkPath& path,
                                     const SkMatrix* matrix, const SkPaint& paint) {
     SkRect bbox = path.getBounds();
     SkPaint::FontMetrics metrics;
     paint.getFontMetrics(&metrics);

     // pad out all sides by the max glyph height above baseline
     SkScalar pad = metrics.fTop;
     bbox.fLeft += pad;
     bbox.fRight -= pad;
     bbox.fTop += pad;
     bbox.fBottom -= pad;

     if (this->transformBounds(bbox, &paint)) {
         INHERITED::onDrawTextOnPath(text, byteLength, path, matrix, paint);
     }
 }

 void SkBBoxRecord::drawVertices(VertexMode mode, int vertexCount,
                                 const SkPoint vertices[], const SkPoint texs[],
                                 const SkColor colors[], SkXfermode* xfer,
                                 const uint16_t indices[], int indexCount,
                                 const SkPaint& paint) {
     SkRect bbox;
     bbox.set(vertices, vertexCount);
     if (this->transformBounds(bbox, &paint)) {
         INHERITED::drawVertices(mode, vertexCount, vertices, texs,
                                 colors, xfer, indices, indexCount, paint);
     }
 }

 void SkBBoxRecord::onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
                                const SkPoint texCoords[4], SkXfermode* xmode,
                                const SkPaint& paint) {
     SkRect bbox;
     bbox.set(cubics, SkPatchUtils::kNumCtrlPts);
     if (this->transformBounds(bbox, &paint)) {
         INHERITED::onDrawPatch(cubics, colors, texCoords, xmode, paint);
     }
 }

 void SkBBoxRecord::onDrawPicture(const SkPicture* picture, const SkMatrix* matrix,
                                  const SkPaint* paint) {
     SkRect bounds = SkRect::MakeWH(SkIntToScalar(picture->width()),
                                    SkIntToScalar(picture->height()));
     // todo: wonder if we should allow passing an optional matrix to transformBounds so we don't
     // end up transforming the rect twice.
     if (matrix) {
         matrix->mapRect(&bounds);
     }
     if (this->transformBounds(bounds, paint)) {
         this->INHERITED::onDrawPicture(picture, matrix, paint);
     }
 }

 void SkBBoxRecord::willSave() {
     fSaveStack.push(NULL);
     this->INHERITED::willSave();
 }

 SkCanvas::SaveLayerStrategy SkBBoxRecord::willSaveLayer(const SkRect* bounds,
                                                         const SkPaint* paint,
                                                         SaveFlags flags) {
     // Image filters can affect the effective bounds of primitives drawn inside saveLayer().
     // Copy the paint so we can compute the modified bounds in transformBounds().
     fSaveStack.push(paint && paint->getImageFilter() ? new SkPaint(*paint) : NULL);
     return this->INHERITED::willSaveLayer(bounds, paint, flags);
 }

 void SkBBoxRecord::willRestore() {
     delete fSaveStack.top();
     fSaveStack.pop();
     this->INHERITED::willRestore();
 }

 bool SkBBoxRecord::transformBounds(const SkRect& bounds, const SkPaint* paint) {
     SkRect outBounds = bounds;
     outBounds.sort();

     if (paint) {
         // account for stroking, path effects, shadows, etc
         if (paint->canComputeFastBounds()) {
             SkRect temp;
             outBounds = paint->computeFastBounds(outBounds, &temp);
         } else {
             // set bounds to current clip
             if (!this->getClipBounds(&outBounds)) {
                 // current clip is empty
                 return false;
             }
         }
     }

     for (int i = fSaveStack.count() - 1; i >= 0; --i) {
         const SkPaint* paint = fSaveStack.getAt(i);
         if (paint && paint->canComputeFastBounds()) {
             SkRect temp;
             outBounds = paint->computeFastBounds(outBounds, &temp);
         }
     }

     if (!outBounds.isEmpty() && !this->quickReject(outBounds)) {
         this->getTotalMatrix().mapRect(&outBounds);
         this->handleBBox(outBounds);
         return true;
     }

     return false;
 }

	/*
	* Copyright 2012 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include "SkBBoxRecord.h"
	#include "SkPatchUtils.h"

	SkBBoxRecord::~SkBBoxRecord() {
	fSaveStack.deleteAll();
	}

	void SkBBoxRecord::drawOval(const SkRect& rect, const SkPaint& paint) {
	if (this->transformBounds(rect, &paint)) {
	INHERITED::drawOval(rect, paint);
	}
	}

	void SkBBoxRecord::drawRRect(const SkRRect& rrect, const SkPaint& paint) {
	if (this->transformBounds(rrect.rect(), &paint)) {
	INHERITED::drawRRect(rrect, paint);
	}
	}

	void SkBBoxRecord::drawRect(const SkRect& rect, const SkPaint& paint) {
	if (this->transformBounds(rect, &paint)) {
	INHERITED::drawRect(rect, paint);
	}
	}

	void SkBBoxRecord::onDrawDRRect(const SkRRect& outer, const SkRRect& inner,
	const SkPaint& paint) {
	if (this->transformBounds(outer.rect(), &paint)) {
	this->INHERITED::onDrawDRRect(outer, inner, paint);
	}
	}

	void SkBBoxRecord::drawPath(const SkPath& path, const SkPaint& paint) {
	if (path.isInverseFillType()) {
	// If path is inverse filled, use the current clip bounds as the
	// path's device-space bounding box.
	SkIRect clipBounds;
	if (this->getClipDeviceBounds(&clipBounds)) {
	this->handleBBox(SkRect::Make(clipBounds));
	INHERITED::drawPath(path, paint);
	}
	} else if (this->transformBounds(path.getBounds(), &paint)) {
	INHERITED::drawPath(path, paint);
	}
	}

	void SkBBoxRecord::drawPoints(PointMode mode, size_t count, const SkPoint pts[],
	const SkPaint& paint) {
	SkRect bbox;
	bbox.set(pts, SkToInt(count));
	// Small min width value, just to ensure hairline point bounding boxes aren't empty.
	// Even though we know hairline primitives are drawn one pixel wide, we do not use a
	// minimum of 1 because the playback scale factor is unknown at record time. Later
	// outsets will take care of adding additional padding for antialiasing and rounding out
	// to integer device coordinates, guaranteeing that the rasterized pixels will be included
	// in the computed bounds.
	// Note: The device coordinate outset in SkBBoxHierarchyRecord::handleBBox is currently
	// done in the recording coordinate space, which is wrong.
	// http://code.google.com/p/skia/issues/detail?id=1021
	static const SkScalar kMinWidth = 0.01f;
	SkScalar halfStrokeWidth = SkMaxScalar(paint.getStrokeWidth(), kMinWidth) / 2;
	bbox.outset(halfStrokeWidth, halfStrokeWidth);
	if (this->transformBounds(bbox, &paint)) {
	INHERITED::drawPoints(mode, count, pts, paint);
	}
	}

	void SkBBoxRecord::drawPaint(const SkPaint& paint) {
	SkRect bbox;
	if (this->getClipBounds(&bbox)) {
	if (this->transformBounds(bbox, &paint)) {
	INHERITED::drawPaint(paint);
	}
	}
	}

	void SkBBoxRecord::clear(SkColor color) {
	SkISize size = this->getDeviceSize();
	SkRect bbox = {0, 0, SkIntToScalar(size.width()), SkIntToScalar(size.height())};
	this->handleBBox(bbox);
	INHERITED::clear(color);
	}

	void SkBBoxRecord::onDrawText(const void* text, size_t byteLength, SkScalar x, SkScalar y,
	const SkPaint& paint) {
	SkRect bbox;
	paint.measureText(text, byteLength, &bbox);
	SkPaint::FontMetrics metrics;
	paint.getFontMetrics(&metrics);

	// Vertical and aligned text need to be offset
	if (paint.isVerticalText()) {
	SkScalar h = bbox.fBottom - bbox.fTop;
	if (paint.getTextAlign() == SkPaint::kCenter_Align) {
	bbox.fTop -= h / 2;
	bbox.fBottom -= h / 2;
	}
	// Pad top and bottom with max extents from FontMetrics
	bbox.fBottom += metrics.fBottom;
	bbox.fTop += metrics.fTop;
	} else {
	SkScalar w = bbox.fRight - bbox.fLeft;
	if (paint.getTextAlign() == SkPaint::kCenter_Align) {
	bbox.fLeft -= w / 2;
	bbox.fRight -= w / 2;
	} else if (paint.getTextAlign() == SkPaint::kRight_Align) {
	bbox.fLeft -= w;
	bbox.fRight -= w;
	}
	// Set vertical bounds to max extents from font metrics
	bbox.fTop = metrics.fTop;
	bbox.fBottom = metrics.fBottom;
	}

	// Pad horizontal bounds on each side by half of max vertical extents (this is sort of
	// arbitrary, but seems to produce reasonable results, if there were a way of getting max
	// glyph X-extents to pad by, that may be better here, but FontMetrics fXMin and fXMax seem
	// incorrect on most platforms (too small in Linux, never even set in Windows).
	SkScalar pad = (metrics.fBottom - metrics.fTop) / 2;
	bbox.fLeft -= pad;
	bbox.fRight += pad;

	bbox.fLeft += x;
	bbox.fRight += x;
	bbox.fTop += y;
	bbox.fBottom += y;
	if (this->transformBounds(bbox, &paint)) {
	INHERITED::onDrawText(text, byteLength, x, y, paint);
	}
	}

	void SkBBoxRecord::drawBitmap(const SkBitmap& bitmap, SkScalar left, SkScalar top,
	const SkPaint* paint) {
	SkRect bbox = {left, top, left + bitmap.width(), top + bitmap.height()};
	if (this->transformBounds(bbox, paint)) {
	INHERITED::drawBitmap(bitmap, left, top, paint);
	}
	}

	void SkBBoxRecord::drawBitmapRectToRect(const SkBitmap& bitmap, const SkRect* src,
	const SkRect& dst, const SkPaint* paint,
	DrawBitmapRectFlags flags) {
	if (this->transformBounds(dst, paint)) {
	INHERITED::drawBitmapRectToRect(bitmap, src, dst, paint, flags);
	}
	}

	void SkBBoxRecord::drawBitmapMatrix(const SkBitmap& bitmap, const SkMatrix& mat,
	const SkPaint* paint) {
	SkMatrix m = mat;
	SkRect bbox = {0, 0, SkIntToScalar(bitmap.width()), SkIntToScalar(bitmap.height())};
	m.mapRect(&bbox);
	if (this->transformBounds(bbox, paint)) {
	INHERITED::drawBitmapMatrix(bitmap, mat, paint);
	}
	}

	void SkBBoxRecord::drawBitmapNine(const SkBitmap& bitmap, const SkIRect& center,
	const SkRect& dst, const SkPaint* paint) {
	if (this->transformBounds(dst, paint)) {
	INHERITED::drawBitmapNine(bitmap, center, dst, paint);
	}
	}

	// Hack to work-around https://code.google.com/p/chromium/issues/detail?id=373785
	// This logic assums that 'pad' is enough to add to the left and right to account for
	// big glyphs. For the font in question (a logo font) the glyphs is much wider than just
	// the pointsize (approx 3x wider).
	// As a temp work-around, we scale-up pad.
	// A more correct fix might be to add fontmetrics.fMaxX, but we don't have that value in hand
	// at the moment, and (possibly) the value in the font may not be accurate (but who knows).
	//
	static SkScalar hack_373785_amend_pad(SkScalar pad) {
	return pad * 4;
	}

	void SkBBoxRecord::onDrawPosText(const void* text, size_t byteLength, const SkPoint pos[],
	const SkPaint& paint) {
	SkRect bbox;
	bbox.set(pos, paint.countText(text, byteLength));
	SkPaint::FontMetrics metrics;
	paint.getFontMetrics(&metrics);
	bbox.fTop += metrics.fTop;
	bbox.fBottom += metrics.fBottom;

	// pad on left and right by half of max vertical glyph extents
	SkScalar pad = (metrics.fTop - metrics.fBottom) / 2;
	pad = hack_373785_amend_pad(pad);
	bbox.fLeft += pad;
	bbox.fRight -= pad;

	if (this->transformBounds(bbox, &paint)) {
	INHERITED::onDrawPosText(text, byteLength, pos, paint);
	}
	}

	void SkBBoxRecord::onDrawPosTextH(const void* text, size_t byteLength, const SkScalar xpos[],
	SkScalar constY, const SkPaint& paint) {
	size_t numChars = paint.countText(text, byteLength);
	if (numChars == 0) {
	return;
	}

	const SkFlatData* flatPaintData = this->getFlatPaintData(paint);
	WriteTopBot(paint, *flatPaintData);

	SkScalar top = flatPaintData->topBot()[0];
	SkScalar bottom = flatPaintData->topBot()[1];
	SkScalar pad = top - bottom;

	SkRect bbox;
	bbox.fLeft = SK_ScalarMax;
	bbox.fRight = SK_ScalarMin;

	for (size_t i = 0; i < numChars; ++i) {
	if (xpos[i] < bbox.fLeft) {
	bbox.fLeft = xpos[i];
	}
	if (xpos[i] > bbox.fRight) {
	bbox.fRight = xpos[i];
	}
	}

	// pad horizontally by max glyph height
	pad = hack_373785_amend_pad(pad);
	bbox.fLeft += pad;
	bbox.fRight -= pad;

	bbox.fTop = top + constY;
	bbox.fBottom = bottom + constY;

	if (!this->transformBounds(bbox, &paint)) {
	return;
	}
	// This is the equivalent of calling:
	// INHERITED::drawPosTextH(text, byteLength, xpos, constY, paint);
	// but we filled our flat paint beforehand so that we could get font metrics.
	drawPosTextHImpl(text, byteLength, xpos, constY, paint, flatPaintData);
	}

	void SkBBoxRecord::drawSprite(const SkBitmap& bitmap, int left, int top,
	const SkPaint* paint) {
	SkRect bbox;
	bbox.set(SkIRect::MakeXYWH(left, top, bitmap.width(), bitmap.height()));
	this->handleBBox(bbox); // directly call handleBBox, matrix is ignored
	INHERITED::drawSprite(bitmap, left, top, paint);
	}

	void SkBBoxRecord::onDrawTextOnPath(const void* text, size_t byteLength, const SkPath& path,
	const SkMatrix* matrix, const SkPaint& paint) {
	SkRect bbox = path.getBounds();
	SkPaint::FontMetrics metrics;
	paint.getFontMetrics(&metrics);

	// pad out all sides by the max glyph height above baseline
	SkScalar pad = metrics.fTop;
	bbox.fLeft += pad;
	bbox.fRight -= pad;
	bbox.fTop += pad;
	bbox.fBottom -= pad;

	if (this->transformBounds(bbox, &paint)) {
	INHERITED::onDrawTextOnPath(text, byteLength, path, matrix, paint);
	}
	}

	void SkBBoxRecord::drawVertices(VertexMode mode, int vertexCount,
	const SkPoint vertices[], const SkPoint texs[],
	const SkColor colors[], SkXfermode* xfer,
	const uint16_t indices[], int indexCount,
	const SkPaint& paint) {
	SkRect bbox;
	bbox.set(vertices, vertexCount);
	if (this->transformBounds(bbox, &paint)) {
	INHERITED::drawVertices(mode, vertexCount, vertices, texs,
	colors, xfer, indices, indexCount, paint);
	}
	}

	void SkBBoxRecord::onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
	const SkPoint texCoords[4], SkXfermode* xmode,
	const SkPaint& paint) {
	SkRect bbox;
	bbox.set(cubics, SkPatchUtils::kNumCtrlPts);
	if (this->transformBounds(bbox, &paint)) {
	INHERITED::onDrawPatch(cubics, colors, texCoords, xmode, paint);
	}
	}

	void SkBBoxRecord::onDrawPicture(const SkPicture* picture, const SkMatrix* matrix,
	const SkPaint* paint) {
	SkRect bounds = SkRect::MakeWH(SkIntToScalar(picture->width()),
	SkIntToScalar(picture->height()));
	// todo: wonder if we should allow passing an optional matrix to transformBounds so we don't
	// end up transforming the rect twice.
	if (matrix) {
	matrix->mapRect(&bounds);
	}
	if (this->transformBounds(bounds, paint)) {
	this->INHERITED::onDrawPicture(picture, matrix, paint);
	}
	}

	void SkBBoxRecord::willSave() {
	fSaveStack.push(NULL);
	this->INHERITED::willSave();
	}

	SkCanvas::SaveLayerStrategy SkBBoxRecord::willSaveLayer(const SkRect* bounds,
	const SkPaint* paint,
	SaveFlags flags) {
	// Image filters can affect the effective bounds of primitives drawn inside saveLayer().
	// Copy the paint so we can compute the modified bounds in transformBounds().
	fSaveStack.push(paint && paint->getImageFilter() ? new SkPaint(*paint) : NULL);
	return this->INHERITED::willSaveLayer(bounds, paint, flags);
	}

	void SkBBoxRecord::willRestore() {
	delete fSaveStack.top();
	fSaveStack.pop();
	this->INHERITED::willRestore();
	}

	bool SkBBoxRecord::transformBounds(const SkRect& bounds, const SkPaint* paint) {
	SkRect outBounds = bounds;
	outBounds.sort();

	if (paint) {
	// account for stroking, path effects, shadows, etc
	if (paint->canComputeFastBounds()) {
	SkRect temp;
	outBounds = paint->computeFastBounds(outBounds, &temp);
	} else {
	// set bounds to current clip
	if (!this->getClipBounds(&outBounds)) {
	// current clip is empty
	return false;
	}
	}
	}

	for (int i = fSaveStack.count() - 1; i >= 0; --i) {
	const SkPaint* paint = fSaveStack.getAt(i);
	if (paint && paint->canComputeFastBounds()) {
	SkRect temp;
	outBounds = paint->computeFastBounds(outBounds, &temp);
	}
	}

	if (!outBounds.isEmpty() && !this->quickReject(outBounds)) {
	this->getTotalMatrix().mapRect(&outBounds);
	this->handleBBox(outBounds);
	return true;
	}

	return false;
	}