aboutsummaryrefslogtreecommitdiffhomepage
path: root/src/core/SkBBoxRecord.cpp
blob: 366808703f6a97ef74987fde48a4a7d7f1bac818 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285

/*
 * 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::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::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::MakeFromIRect(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, 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 = SkFloatToScalar(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::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::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);
    }
}

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 max glyph height
        SkScalar pad = (metrics.fTop - metrics.fBottom);
        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;
    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::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) {
    if (picture.width() > 0 && picture.height() > 0 &&
        this->transformBounds(SkRect::MakeWH(picture.width(), picture.height()), NULL)) {
        INHERITED::drawPicture(picture);
    }
}

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;
            }
        }
    }

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

    return false;
}