SkBBoxRecord.cpp revision 1cc07d940fcd10f52bf8228c272707f0f5df0b44 
1
2/*
3 * Copyright 2012 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8
9#include "SkBBoxRecord.h"
10
11void SkBBoxRecord::drawOval(const SkRect& rect, const SkPaint& paint) {
12    if (this->transformBounds(rect, &paint)) {
13        INHERITED::drawOval(rect, paint);
14    }
15}
16
17void SkBBoxRecord::drawRRect(const SkRRect& rrect, const SkPaint& paint) {
18    if (this->transformBounds(rrect.rect(), &paint)) {
19        INHERITED::drawRRect(rrect, paint);
20    }
21}
22
23void SkBBoxRecord::drawRect(const SkRect& rect, const SkPaint& paint) {
24    if (this->transformBounds(rect, &paint)) {
25        INHERITED::drawRect(rect, paint);
26    }
27}
28
29void SkBBoxRecord::drawPath(const SkPath& path, const SkPaint& paint) {
30    if (path.isInverseFillType()) {
31        // If path is inverse filled, use the current clip bounds as the
32        // path's device-space bounding box.
33        SkIRect clipBounds;
34        if (this->getClipDeviceBounds(&clipBounds)) {
35            this->handleBBox(SkRect::MakeFromIRect(clipBounds));
36            INHERITED::drawPath(path, paint);
37        }
38    } else if (this->transformBounds(path.getBounds(), &paint)) {
39        INHERITED::drawPath(path, paint);
40    }
41}
42
43void SkBBoxRecord::drawPoints(PointMode mode, size_t count, const SkPoint pts[],
44                              const SkPaint& paint) {
45    SkRect bbox;
46    bbox.set(pts, count);
47    // Small min width value, just to ensure hairline point bounding boxes aren't empty.
48    // Even though we know hairline primitives are drawn one pixel wide, we do not use a
49    // minimum of 1 because the playback scale factor is unknown at record time. Later
50    // outsets will take care of adding additional padding for antialiasing and rounding out
51    // to integer device coordinates, guaranteeing that the rasterized pixels will be included
52    // in the computed bounds.
53    // Note: The device coordinate outset in SkBBoxHierarchyRecord::handleBBox is currently
54    // done in the recording coordinate space, which is wrong.
55    // http://code.google.com/p/skia/issues/detail?id=1021
56    static const SkScalar kMinWidth = SkFloatToScalar(0.01f);
57    SkScalar halfStrokeWidth = SkMaxScalar(paint.getStrokeWidth(), kMinWidth) / 2;
58    bbox.outset(halfStrokeWidth, halfStrokeWidth);
59    if (this->transformBounds(bbox, &paint)) {
60        INHERITED::drawPoints(mode, count, pts, paint);
61    }
62}
63
64void SkBBoxRecord::drawPaint(const SkPaint& paint) {
65    SkRect bbox;
66    if (this->getClipBounds(&bbox)) {
67        if (this->transformBounds(bbox, &paint)) {
68            INHERITED::drawPaint(paint);
69        }
70    }
71}
72
73void SkBBoxRecord::clear(SkColor color) {
74    SkISize size = this->getDeviceSize();
75    SkRect bbox = {0, 0, SkIntToScalar(size.width()), SkIntToScalar(size.height())};
76    this->handleBBox(bbox);
77    INHERITED::clear(color);
78}
79
80void SkBBoxRecord::drawText(const void* text, size_t byteLength, SkScalar x, SkScalar y,
81                            const SkPaint& paint) {
82    SkRect bbox;
83    paint.measureText(text, byteLength, &bbox);
84    SkPaint::FontMetrics metrics;
85    paint.getFontMetrics(&metrics);
86
87    // Vertical and aligned text need to be offset
88    if (paint.isVerticalText()) {
89        SkScalar h = bbox.fBottom - bbox.fTop;
90        if (paint.getTextAlign() == SkPaint::kCenter_Align) {
91            bbox.fTop    -= h / 2;
92            bbox.fBottom -= h / 2;
93        }
94        // Pad top and bottom with max extents from FontMetrics
95        bbox.fBottom += metrics.fBottom;
96        bbox.fTop += metrics.fTop;
97    } else {
98        SkScalar w = bbox.fRight - bbox.fLeft;
99        if (paint.getTextAlign() == SkPaint::kCenter_Align) {
100            bbox.fLeft  -= w / 2;
101            bbox.fRight -= w / 2;
102        } else if (paint.getTextAlign() == SkPaint::kRight_Align) {
103            bbox.fLeft  -= w;
104            bbox.fRight -= w;
105        }
106        // Set vertical bounds to max extents from font metrics
107        bbox.fTop = metrics.fTop;
108        bbox.fBottom = metrics.fBottom;
109    }
110
111    // Pad horizontal bounds on each side by half of max vertical extents (this is sort of
112    // arbitrary, but seems to produce reasonable results, if there were a way of getting max
113    // glyph X-extents to pad by, that may be better here, but FontMetrics fXMin and fXMax seem
114    // incorrect on most platforms (too small in Linux, never even set in Windows).
115    SkScalar pad = (metrics.fBottom - metrics.fTop) / 2;
116    bbox.fLeft  -= pad;
117    bbox.fRight += pad;
118
119    bbox.fLeft += x;
120    bbox.fRight += x;
121    bbox.fTop += y;
122    bbox.fBottom += y;
123    if (this->transformBounds(bbox, &paint)) {
124        INHERITED::drawText(text, byteLength, x, y, paint);
125    }
126}
127
128void SkBBoxRecord::drawBitmap(const SkBitmap& bitmap, SkScalar left, SkScalar top,
129                              const SkPaint* paint) {
130    SkRect bbox = {left, top, left + bitmap.width(), top + bitmap.height()};
131    if (this->transformBounds(bbox, paint)) {
132        INHERITED::drawBitmap(bitmap, left, top, paint);
133    }
134}
135
136void SkBBoxRecord::drawBitmapRectToRect(const SkBitmap& bitmap, const SkRect* src,
137                                  const SkRect& dst, const SkPaint* paint) {
138    if (this->transformBounds(dst, paint)) {
139        INHERITED::drawBitmapRectToRect(bitmap, src, dst, paint);
140    }
141}
142
143void SkBBoxRecord::drawBitmapMatrix(const SkBitmap& bitmap, const SkMatrix& mat,
144                                    const SkPaint* paint) {
145    SkMatrix m = mat;
146    SkRect bbox = {0, 0, SkIntToScalar(bitmap.width()), SkIntToScalar(bitmap.height())};
147    m.mapRect(&bbox);
148    if (this->transformBounds(bbox, paint)) {
149        INHERITED::drawBitmapMatrix(bitmap, mat, paint);
150    }
151}
152
153void SkBBoxRecord::drawBitmapNine(const SkBitmap& bitmap, const SkIRect& center,
154                                  const SkRect& dst, const SkPaint* paint) {
155    if (this->transformBounds(dst, paint)) {
156        INHERITED::drawBitmapNine(bitmap, center, dst, paint);
157    }
158}
159
160void SkBBoxRecord::drawPosText(const void* text, size_t byteLength,
161                               const SkPoint pos[], const SkPaint& paint) {
162    SkRect bbox;
163    bbox.set(pos, paint.countText(text, byteLength));
164    SkPaint::FontMetrics metrics;
165    paint.getFontMetrics(&metrics);
166    bbox.fTop += metrics.fTop;
167    bbox.fBottom += metrics.fBottom;
168
169    // pad on left and right by half of max vertical glyph extents
170    SkScalar pad = (metrics.fTop - metrics.fBottom) / 2;
171    bbox.fLeft += pad;
172    bbox.fRight -= pad;
173
174    if (this->transformBounds(bbox, &paint)) {
175        INHERITED::drawPosText(text, byteLength, pos, paint);
176    }
177}
178
179void SkBBoxRecord::drawPosTextH(const void* text, size_t byteLength, const SkScalar xpos[],
180                                SkScalar constY, const SkPaint& paint) {
181    SkRect bbox;
182    size_t numChars = paint.countText(text, byteLength);
183    if (numChars > 0) {
184        bbox.fLeft  = xpos[0];
185        bbox.fRight = xpos[numChars - 1];
186        // if we had a guarantee that these will be monotonically increasing, this could be sped up
187        for (size_t i = 1; i < numChars; ++i) {
188            if (xpos[i] < bbox.fLeft) {
189                bbox.fLeft = xpos[i];
190            }
191            if (xpos[i] > bbox.fRight) {
192                bbox.fRight = xpos[i];
193            }
194        }
195        SkPaint::FontMetrics metrics;
196        paint.getFontMetrics(&metrics);
197
198        // pad horizontally by max glyph height
199        SkScalar pad = (metrics.fTop - metrics.fBottom);
200        bbox.fLeft  += pad;
201        bbox.fRight -= pad;
202
203        bbox.fTop    = metrics.fTop + constY;
204        bbox.fBottom = metrics.fBottom + constY;
205        if (!this->transformBounds(bbox, &paint)) {
206            return;
207        }
208    }
209    INHERITED::drawPosTextH(text, byteLength, xpos, constY, paint);
210}
211
212void SkBBoxRecord::drawSprite(const SkBitmap& bitmap, int left, int top,
213                              const SkPaint* paint) {
214    SkRect bbox;
215    bbox.set(SkIRect::MakeXYWH(left, top, bitmap.width(), bitmap.height()));
216    this->handleBBox(bbox); // directly call handleBBox, matrix is ignored
217    INHERITED::drawSprite(bitmap, left, top, paint);
218}
219
220void SkBBoxRecord::drawTextOnPath(const void* text, size_t byteLength,
221                                  const SkPath& path, const SkMatrix* matrix,
222                                  const SkPaint& paint) {
223    SkRect bbox = path.getBounds();
224    SkPaint::FontMetrics metrics;
225    paint.getFontMetrics(&metrics);
226
227    // pad out all sides by the max glyph height above baseline
228    SkScalar pad = metrics.fTop;
229    bbox.fLeft += pad;
230    bbox.fRight -= pad;
231    bbox.fTop += pad;
232    bbox.fBottom -= pad;
233
234    if (this->transformBounds(bbox, &paint)) {
235        INHERITED::drawTextOnPath(text, byteLength, path, matrix, paint);
236    }
237}
238
239void SkBBoxRecord::drawVertices(VertexMode mode, int vertexCount,
240                                const SkPoint vertices[], const SkPoint texs[],
241                                const SkColor colors[], SkXfermode* xfer,
242                                const uint16_t indices[], int indexCount,
243                                const SkPaint& paint) {
244    SkRect bbox;
245    bbox.set(vertices, vertexCount);
246    if (this->transformBounds(bbox, &paint)) {
247        INHERITED::drawVertices(mode, vertexCount, vertices, texs,
248                                colors, xfer, indices, indexCount, paint);
249    }
250}
251
252void SkBBoxRecord::drawPicture(SkPicture& picture) {
253    if (picture.width() > 0 && picture.height() > 0 &&
254        this->transformBounds(SkRect::MakeWH(picture.width(), picture.height()), NULL)) {
255        INHERITED::drawPicture(picture);
256    }
257}
258
259bool SkBBoxRecord::transformBounds(const SkRect& bounds, const SkPaint* paint) {
260    SkRect outBounds = bounds;
261    outBounds.sort();
262
263    if (paint) {
264        // account for stroking, path effects, shadows, etc
265        if (paint->canComputeFastBounds()) {
266            SkRect temp;
267            outBounds = paint->computeFastBounds(outBounds, &temp);
268        } else {
269            // set bounds to current clip
270            if (!this->getClipBounds(&outBounds)) {
271                // current clip is empty
272                return false;
273            }
274        }
275    }
276
277    if (!outBounds.isEmpty() && !this->quickReject(outBounds)) {
278        this->getTotalMatrix().mapRect(&outBounds);
279        this->handleBBox(outBounds);
280        return true;
281    }
282
283    return false;
284}
285