Add SkPictureRecord subclass that computes bounding boxes.
Review URL: https://codereview.appspot.com/6506082 git-svn-id: http://skia.googlecode.com/svn/trunk@5423 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
rileya@google.com
parent
f06df1bb9a
commit
e0201a4448
@ -15,6 +15,8 @@
|
||||
'<(skia_src_path)/core/SkAlphaRuns.cpp',
|
||||
'<(skia_src_path)/core/SkAntiRun.h',
|
||||
'<(skia_src_path)/core/SkBBoxHierarchy.h',
|
||||
'<(skia_src_path)/core/SkBBoxRecord.cpp',
|
||||
'<(skia_src_path)/core/SkBBoxRecord.h',
|
||||
'<(skia_src_path)/core/SkBitmap.cpp',
|
||||
'<(skia_src_path)/core/SkBitmapHeap.cpp',
|
||||
'<(skia_src_path)/core/SkBitmapHeap.h',
|
||||
|
||||
253
src/core/SkBBoxRecord.cpp
Normal file
253
src/core/SkBBoxRecord.cpp
Normal file
@ -0,0 +1,253 @@
|
||||
|
||||
/*
|
||||
* 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"
|
||||
|
||||
void SkBBoxRecord::drawRect(const SkRect& rect, const SkPaint& paint) {
|
||||
if (this->transformBounds(rect, &paint)) {
|
||||
INHERITED::drawRect(rect, paint);
|
||||
}
|
||||
}
|
||||
|
||||
void SkBBoxRecord::drawPath(const SkPath& path, const SkPaint& paint) {
|
||||
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, count);
|
||||
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, size.width(), size.height()};
|
||||
this->handleBBox(bbox);
|
||||
INHERITED::clear(color);
|
||||
}
|
||||
|
||||
void SkBBoxRecord::drawText(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::drawText(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::drawBitmapRect(const SkBitmap& bitmap, const SkIRect* src,
|
||||
const SkRect& dst, const SkPaint* paint) {
|
||||
if (this->transformBounds(dst, paint)) {
|
||||
INHERITED::drawBitmapRect(bitmap, src, dst, paint);
|
||||
}
|
||||
}
|
||||
|
||||
void SkBBoxRecord::drawBitmapMatrix(const SkBitmap& bitmap, const SkMatrix& mat,
|
||||
const SkPaint* paint) {
|
||||
SkMatrix m = mat;
|
||||
SkRect bbox = {0, 0, bitmap.width(), 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);
|
||||
}
|
||||
}
|
||||
|
||||
void SkBBoxRecord::drawPosText(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;
|
||||
bbox.fLeft += pad;
|
||||
bbox.fRight -= pad;
|
||||
|
||||
if (this->transformBounds(bbox, &paint)) {
|
||||
INHERITED::drawPosText(text, byteLength, pos, paint);
|
||||
}
|
||||
}
|
||||
|
||||
void SkBBoxRecord::drawPosTextH(const void* text, size_t byteLength, const SkScalar xpos[],
|
||||
SkScalar constY, const SkPaint& paint) {
|
||||
SkRect bbox;
|
||||
size_t numChars = paint.countText(text, byteLength);
|
||||
if (numChars > 0) {
|
||||
bbox.fLeft = xpos[0];
|
||||
bbox.fRight = xpos[numChars - 1];
|
||||
// if we had a guarantee that these will be monotonically increasing, this could be sped up
|
||||
for (size_t i = 1; i < numChars; ++i) {
|
||||
if (xpos[i] < bbox.fLeft) {
|
||||
bbox.fLeft = xpos[i];
|
||||
}
|
||||
if (xpos[i] > bbox.fRight) {
|
||||
bbox.fRight = xpos[i];
|
||||
}
|
||||
}
|
||||
SkPaint::FontMetrics metrics;
|
||||
paint.getFontMetrics(&metrics);
|
||||
|
||||
// pad horizontally by half max glyph height
|
||||
SkScalar pad = (metrics.fTop - metrics.fBottom) / 2;
|
||||
bbox.fLeft += pad;
|
||||
bbox.fRight -= pad;
|
||||
|
||||
bbox.fTop = metrics.fTop + constY;
|
||||
bbox.fBottom = metrics.fBottom + constY;
|
||||
if (!this->transformBounds(bbox, &paint)) {
|
||||
return;
|
||||
}
|
||||
}
|
||||
INHERITED::drawPosTextH(text, byteLength, xpos, constY, paint);
|
||||
}
|
||||
|
||||
void SkBBoxRecord::drawSprite(const SkBitmap& bitmap, int left, int top,
|
||||
const SkPaint* paint) {
|
||||
SkRect bbox = {left, top, left + bitmap.width(), top + bitmap.height()};
|
||||
this->handleBBox(bbox); // directly call handleBBox, matrix is ignored
|
||||
INHERITED::drawBitmap(bitmap, left, top, paint);
|
||||
}
|
||||
|
||||
void SkBBoxRecord::drawTextOnPath(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::drawTextOnPath(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::drawPicture(SkPicture& picture) {
|
||||
SkRect bbox = {0, 0, picture.width(), picture.height()};
|
||||
if (this->transformBounds(bbox, NULL)) {
|
||||
INHERITED::drawPicture(picture);
|
||||
}
|
||||
}
|
||||
|
||||
bool SkBBoxRecord::transformBounds(const SkRect& bounds, const SkPaint* paint) {
|
||||
SkRect outBounds = bounds;
|
||||
|
||||
if (paint) {
|
||||
// account for stroking, path effects, shadows, etc
|
||||
if (paint->canComputeFastBounds()) {
|
||||
SkRect temp;
|
||||
outBounds = paint->computeFastBounds(bounds, &temp);
|
||||
} else {
|
||||
// set bounds to current clip
|
||||
if (!this->getClipBounds(&outBounds)) {
|
||||
// current clip is empty
|
||||
return false;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
SkRect clip;
|
||||
|
||||
if (this->getClipBounds(&clip) && outBounds.intersect(clip)) {
|
||||
this->getTotalMatrix().mapRect(&outBounds);
|
||||
this->handleBBox(outBounds);
|
||||
return true;
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
76
src/core/SkBBoxRecord.h
Normal file
76
src/core/SkBBoxRecord.h
Normal file
@ -0,0 +1,76 @@
|
||||
|
||||
/*
|
||||
* Copyright 2012 Google Inc.
|
||||
*
|
||||
* Use of this source code is governed by a BSD-style license that can be
|
||||
* found in the LICENSE file.
|
||||
*/
|
||||
|
||||
#ifndef SkBBoxRecord_DEFINED
|
||||
#define SkBBoxRecord_DEFINED
|
||||
|
||||
#include "SkPictureRecord.h"
|
||||
|
||||
/**
|
||||
* This is an abstract SkPictureRecord subclass that intercepts draw calls and computes an
|
||||
* axis-aligned bounding box for each draw that it sees, subclasses implement handleBBox()
|
||||
* which will be called every time we get a new bounding box.
|
||||
*/
|
||||
class SkBBoxRecord : public SkPictureRecord {
|
||||
public:
|
||||
|
||||
SkBBoxRecord(uint32_t recordFlags) :INHERITED(recordFlags) { }
|
||||
virtual ~SkBBoxRecord() { }
|
||||
|
||||
/**
|
||||
* This is called each time we get a bounding box, it will be axis-aligned,
|
||||
* in device coordinates, and expanded to include stroking, shadows, etc.
|
||||
*/
|
||||
virtual void handleBBox(const SkRect& bbox) = 0;
|
||||
|
||||
virtual void drawRect(const SkRect& rect, const SkPaint& paint) SK_OVERRIDE;
|
||||
virtual void drawPath(const SkPath& path, const SkPaint& paint) SK_OVERRIDE;
|
||||
virtual void drawPoints(PointMode mode, size_t count, const SkPoint pts[],
|
||||
const SkPaint& paint) SK_OVERRIDE;
|
||||
virtual void drawPaint(const SkPaint& paint) SK_OVERRIDE;
|
||||
virtual void clear(SkColor) SK_OVERRIDE;
|
||||
virtual void drawText(const void* text, size_t byteLength, SkScalar x, SkScalar y,
|
||||
const SkPaint& paint) SK_OVERRIDE;
|
||||
virtual void drawBitmap(const SkBitmap& bitmap, SkScalar left, SkScalar top,
|
||||
const SkPaint* paint = NULL) SK_OVERRIDE;
|
||||
virtual void drawBitmapRect(const SkBitmap& bitmap, const SkIRect* src,
|
||||
const SkRect& dst, const SkPaint* paint) SK_OVERRIDE;
|
||||
virtual void drawBitmapMatrix(const SkBitmap& bitmap, const SkMatrix& mat,
|
||||
const SkPaint* paint) SK_OVERRIDE;
|
||||
virtual void drawBitmapNine(const SkBitmap& bitmap, const SkIRect& center,
|
||||
const SkRect& dst, const SkPaint* paint) SK_OVERRIDE;
|
||||
virtual void drawPosText(const void* text, size_t byteLength,
|
||||
const SkPoint pos[], const SkPaint& paint) SK_OVERRIDE;
|
||||
virtual void drawPosTextH(const void* text, size_t byteLength,
|
||||
const SkScalar xpos[], SkScalar constY,
|
||||
const SkPaint& paint) SK_OVERRIDE;
|
||||
virtual void drawSprite(const SkBitmap& bitmap, int left, int top,
|
||||
const SkPaint* paint) SK_OVERRIDE;
|
||||
virtual void drawTextOnPath(const void* text, size_t byteLength,
|
||||
const SkPath& path, const SkMatrix* matrix,
|
||||
const SkPaint& paint) SK_OVERRIDE;
|
||||
virtual void 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) SK_OVERRIDE;
|
||||
virtual void drawPicture(SkPicture& picture) SK_OVERRIDE;
|
||||
|
||||
private:
|
||||
/**
|
||||
* Takes a bounding box in current canvas view space, accounts for stroking and effects, and
|
||||
* computes an axis-aligned bounding box in device coordinates, then passes it to handleBBox()
|
||||
* returns false if the draw is completely clipped out, and may safely be ignored.
|
||||
**/
|
||||
bool transformBounds(const SkRect& bounds, const SkPaint* paint);
|
||||
|
||||
typedef SkPictureRecord INHERITED;
|
||||
};
|
||||
|
||||
#endif
|
||||
|
||||
Loading…
Reference in New Issue
Block a user