зеркало из https://github.com/mozilla/moz-skia.git
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
Родитель
f06df1bb9a
Коммит
e0201a4448
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@ -15,6 +15,8 @@
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'<(skia_src_path)/core/SkAlphaRuns.cpp',
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'<(skia_src_path)/core/SkAntiRun.h',
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'<(skia_src_path)/core/SkBBoxHierarchy.h',
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'<(skia_src_path)/core/SkBBoxRecord.cpp',
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'<(skia_src_path)/core/SkBBoxRecord.h',
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'<(skia_src_path)/core/SkBitmap.cpp',
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'<(skia_src_path)/core/SkBitmapHeap.cpp',
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'<(skia_src_path)/core/SkBitmapHeap.h',
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@ -0,0 +1,253 @@
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/*
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* Copyright 2012 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SkBBoxRecord.h"
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void SkBBoxRecord::drawRect(const SkRect& rect, const SkPaint& paint) {
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if (this->transformBounds(rect, &paint)) {
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INHERITED::drawRect(rect, paint);
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}
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}
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void SkBBoxRecord::drawPath(const SkPath& path, const SkPaint& paint) {
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if (this->transformBounds(path.getBounds(), &paint)) {
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INHERITED::drawPath(path, paint);
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}
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}
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void SkBBoxRecord::drawPoints(PointMode mode, size_t count, const SkPoint pts[],
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const SkPaint& paint) {
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SkRect bbox;
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bbox.set(pts, count);
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if (this->transformBounds(bbox, &paint)) {
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INHERITED::drawPoints(mode, count, pts, paint);
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}
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}
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void SkBBoxRecord::drawPaint(const SkPaint& paint) {
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SkRect bbox;
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if (this->getClipBounds(&bbox)) {
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if (this->transformBounds(bbox, &paint)) {
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INHERITED::drawPaint(paint);
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}
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}
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}
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void SkBBoxRecord::clear(SkColor color) {
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SkISize size = this->getDeviceSize();
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SkRect bbox = {0, 0, size.width(), size.height()};
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this->handleBBox(bbox);
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INHERITED::clear(color);
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}
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void SkBBoxRecord::drawText(const void* text, size_t byteLength, SkScalar x, SkScalar y,
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const SkPaint& paint) {
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SkRect bbox;
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paint.measureText(text, byteLength, &bbox);
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SkPaint::FontMetrics metrics;
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paint.getFontMetrics(&metrics);
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// Vertical and aligned text need to be offset
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if (paint.isVerticalText()) {
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SkScalar h = bbox.fBottom - bbox.fTop;
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if (paint.getTextAlign() == SkPaint::kCenter_Align) {
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bbox.fTop -= h / 2;
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bbox.fBottom -= h / 2;
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}
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// Pad top and bottom with max extents from FontMetrics
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bbox.fBottom += metrics.fBottom;
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bbox.fTop += metrics.fTop;
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} else {
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SkScalar w = bbox.fRight - bbox.fLeft;
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if (paint.getTextAlign() == SkPaint::kCenter_Align) {
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bbox.fLeft -= w / 2;
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bbox.fRight -= w / 2;
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} else if (paint.getTextAlign() == SkPaint::kRight_Align) {
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bbox.fLeft -= w;
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bbox.fRight -= w;
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}
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// Set vertical bounds to max extents from font metrics
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bbox.fTop = metrics.fTop;
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bbox.fBottom = metrics.fBottom;
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}
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// Pad horizontal bounds on each side by half of max vertical extents (this is sort of
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// arbitrary, but seems to produce reasonable results, if there were a way of getting max
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// glyph X-extents to pad by, that may be better here, but FontMetrics fXMin and fXMax seem
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// incorrect on most platforms (too small in Linux, never even set in Windows).
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SkScalar pad = (metrics.fBottom - metrics.fTop) / 2;
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bbox.fLeft -= pad;
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bbox.fRight += pad;
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bbox.fLeft += x;
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bbox.fRight += x;
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bbox.fTop += y;
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bbox.fBottom += y;
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if (this->transformBounds(bbox, &paint)) {
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INHERITED::drawText(text, byteLength, x, y, paint);
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}
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}
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void SkBBoxRecord::drawBitmap(const SkBitmap& bitmap, SkScalar left, SkScalar top,
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const SkPaint* paint) {
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SkRect bbox = {left, top, left + bitmap.width(), top + bitmap.height()};
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if (this->transformBounds(bbox, paint)) {
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INHERITED::drawBitmap(bitmap, left, top, paint);
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}
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}
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void SkBBoxRecord::drawBitmapRect(const SkBitmap& bitmap, const SkIRect* src,
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const SkRect& dst, const SkPaint* paint) {
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if (this->transformBounds(dst, paint)) {
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INHERITED::drawBitmapRect(bitmap, src, dst, paint);
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}
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}
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void SkBBoxRecord::drawBitmapMatrix(const SkBitmap& bitmap, const SkMatrix& mat,
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const SkPaint* paint) {
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SkMatrix m = mat;
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SkRect bbox = {0, 0, bitmap.width(), bitmap.height()};
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m.mapRect(&bbox);
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if (this->transformBounds(bbox, paint)) {
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INHERITED::drawBitmapMatrix(bitmap, mat, paint);
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}
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}
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void SkBBoxRecord::drawBitmapNine(const SkBitmap& bitmap, const SkIRect& center,
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const SkRect& dst, const SkPaint* paint) {
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if (this->transformBounds(dst, paint)) {
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INHERITED::drawBitmapNine(bitmap, center, dst, paint);
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}
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}
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void SkBBoxRecord::drawPosText(const void* text, size_t byteLength,
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const SkPoint pos[], const SkPaint& paint) {
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SkRect bbox;
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bbox.set(pos, paint.countText(text, byteLength));
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SkPaint::FontMetrics metrics;
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paint.getFontMetrics(&metrics);
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bbox.fTop += metrics.fTop;
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bbox.fBottom += metrics.fBottom;
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// pad on left and right by half of max vertical glyph extents
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SkScalar pad = (metrics.fTop - metrics.fBottom) / 2;
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bbox.fLeft += pad;
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bbox.fRight -= pad;
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if (this->transformBounds(bbox, &paint)) {
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INHERITED::drawPosText(text, byteLength, pos, paint);
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}
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}
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void SkBBoxRecord::drawPosTextH(const void* text, size_t byteLength, const SkScalar xpos[],
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SkScalar constY, const SkPaint& paint) {
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SkRect bbox;
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size_t numChars = paint.countText(text, byteLength);
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if (numChars > 0) {
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bbox.fLeft = xpos[0];
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bbox.fRight = xpos[numChars - 1];
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// if we had a guarantee that these will be monotonically increasing, this could be sped up
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for (size_t i = 1; i < numChars; ++i) {
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if (xpos[i] < bbox.fLeft) {
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bbox.fLeft = xpos[i];
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}
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if (xpos[i] > bbox.fRight) {
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bbox.fRight = xpos[i];
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}
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}
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SkPaint::FontMetrics metrics;
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paint.getFontMetrics(&metrics);
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// pad horizontally by half max glyph height
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SkScalar pad = (metrics.fTop - metrics.fBottom) / 2;
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bbox.fLeft += pad;
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bbox.fRight -= pad;
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bbox.fTop = metrics.fTop + constY;
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bbox.fBottom = metrics.fBottom + constY;
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if (!this->transformBounds(bbox, &paint)) {
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return;
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}
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}
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INHERITED::drawPosTextH(text, byteLength, xpos, constY, paint);
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}
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void SkBBoxRecord::drawSprite(const SkBitmap& bitmap, int left, int top,
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const SkPaint* paint) {
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SkRect bbox = {left, top, left + bitmap.width(), top + bitmap.height()};
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this->handleBBox(bbox); // directly call handleBBox, matrix is ignored
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INHERITED::drawBitmap(bitmap, left, top, paint);
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}
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void SkBBoxRecord::drawTextOnPath(const void* text, size_t byteLength,
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const SkPath& path, const SkMatrix* matrix,
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const SkPaint& paint) {
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SkRect bbox = path.getBounds();
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SkPaint::FontMetrics metrics;
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paint.getFontMetrics(&metrics);
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// pad out all sides by the max glyph height above baseline
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SkScalar pad = metrics.fTop;
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bbox.fLeft += pad;
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bbox.fRight -= pad;
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bbox.fTop += pad;
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bbox.fBottom -= pad;
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if (this->transformBounds(bbox, &paint)) {
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INHERITED::drawTextOnPath(text, byteLength, path, matrix, paint);
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}
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}
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void SkBBoxRecord::drawVertices(VertexMode mode, int vertexCount,
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const SkPoint vertices[], const SkPoint texs[],
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const SkColor colors[], SkXfermode* xfer,
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const uint16_t indices[], int indexCount,
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const SkPaint& paint) {
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SkRect bbox;
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bbox.set(vertices, vertexCount);
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if (this->transformBounds(bbox, &paint)) {
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INHERITED::drawVertices(mode, vertexCount, vertices, texs,
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colors, xfer, indices, indexCount, paint);
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}
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}
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void SkBBoxRecord::drawPicture(SkPicture& picture) {
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SkRect bbox = {0, 0, picture.width(), picture.height()};
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if (this->transformBounds(bbox, NULL)) {
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INHERITED::drawPicture(picture);
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}
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}
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bool SkBBoxRecord::transformBounds(const SkRect& bounds, const SkPaint* paint) {
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SkRect outBounds = bounds;
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if (paint) {
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// account for stroking, path effects, shadows, etc
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if (paint->canComputeFastBounds()) {
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SkRect temp;
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outBounds = paint->computeFastBounds(bounds, &temp);
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} else {
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// set bounds to current clip
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if (!this->getClipBounds(&outBounds)) {
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// current clip is empty
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return false;
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}
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}
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}
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SkRect clip;
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if (this->getClipBounds(&clip) && outBounds.intersect(clip)) {
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this->getTotalMatrix().mapRect(&outBounds);
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this->handleBBox(outBounds);
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return true;
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}
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return false;
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}
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@ -0,0 +1,76 @@
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/*
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* Copyright 2012 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkBBoxRecord_DEFINED
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#define SkBBoxRecord_DEFINED
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#include "SkPictureRecord.h"
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/**
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* This is an abstract SkPictureRecord subclass that intercepts draw calls and computes an
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* axis-aligned bounding box for each draw that it sees, subclasses implement handleBBox()
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* which will be called every time we get a new bounding box.
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*/
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class SkBBoxRecord : public SkPictureRecord {
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public:
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SkBBoxRecord(uint32_t recordFlags) :INHERITED(recordFlags) { }
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virtual ~SkBBoxRecord() { }
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/**
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* This is called each time we get a bounding box, it will be axis-aligned,
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* in device coordinates, and expanded to include stroking, shadows, etc.
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*/
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virtual void handleBBox(const SkRect& bbox) = 0;
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virtual void drawRect(const SkRect& rect, const SkPaint& paint) SK_OVERRIDE;
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virtual void drawPath(const SkPath& path, const SkPaint& paint) SK_OVERRIDE;
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virtual void drawPoints(PointMode mode, size_t count, const SkPoint pts[],
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const SkPaint& paint) SK_OVERRIDE;
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virtual void drawPaint(const SkPaint& paint) SK_OVERRIDE;
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virtual void clear(SkColor) SK_OVERRIDE;
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virtual void drawText(const void* text, size_t byteLength, SkScalar x, SkScalar y,
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const SkPaint& paint) SK_OVERRIDE;
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virtual void drawBitmap(const SkBitmap& bitmap, SkScalar left, SkScalar top,
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const SkPaint* paint = NULL) SK_OVERRIDE;
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virtual void drawBitmapRect(const SkBitmap& bitmap, const SkIRect* src,
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const SkRect& dst, const SkPaint* paint) SK_OVERRIDE;
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virtual void drawBitmapMatrix(const SkBitmap& bitmap, const SkMatrix& mat,
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const SkPaint* paint) SK_OVERRIDE;
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virtual void drawBitmapNine(const SkBitmap& bitmap, const SkIRect& center,
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const SkRect& dst, const SkPaint* paint) SK_OVERRIDE;
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virtual void drawPosText(const void* text, size_t byteLength,
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const SkPoint pos[], const SkPaint& paint) SK_OVERRIDE;
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virtual void drawPosTextH(const void* text, size_t byteLength,
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const SkScalar xpos[], SkScalar constY,
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const SkPaint& paint) SK_OVERRIDE;
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virtual void drawSprite(const SkBitmap& bitmap, int left, int top,
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const SkPaint* paint) SK_OVERRIDE;
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virtual void drawTextOnPath(const void* text, size_t byteLength,
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const SkPath& path, const SkMatrix* matrix,
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const SkPaint& paint) SK_OVERRIDE;
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virtual void drawVertices(VertexMode mode, int vertexCount,
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const SkPoint vertices[], const SkPoint texs[],
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const SkColor colors[], SkXfermode* xfer,
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const uint16_t indices[], int indexCount,
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const SkPaint& paint) SK_OVERRIDE;
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virtual void drawPicture(SkPicture& picture) SK_OVERRIDE;
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private:
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/**
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* Takes a bounding box in current canvas view space, accounts for stroking and effects, and
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* computes an axis-aligned bounding box in device coordinates, then passes it to handleBBox()
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* returns false if the draw is completely clipped out, and may safely be ignored.
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**/
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bool transformBounds(const SkRect& bounds, const SkPaint* paint);
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typedef SkPictureRecord INHERITED;
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};
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#endif
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