1
2/*
3 * Copyright 2008 The Android Open Source Project
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
10#include "SkPageFlipper.h"
11
12SkPageFlipper::SkPageFlipper() {
13    fWidth = 0;
14    fHeight = 0;
15    fDirty0 = &fDirty0Storage;
16    fDirty1 = &fDirty1Storage;
17
18    fDirty0->setEmpty();
19    fDirty1->setEmpty();
20}
21
22SkPageFlipper::SkPageFlipper(int width, int height) {
23    fWidth = width;
24    fHeight = height;
25    fDirty0 = &fDirty0Storage;
26    fDirty1 = &fDirty1Storage;
27
28    fDirty0->setRect(0, 0, width, height);
29    fDirty1->setEmpty();
30}
31
32void SkPageFlipper::resize(int width, int height) {
33    fWidth = width;
34    fHeight = height;
35
36    // this is the opposite of the constructors
37    fDirty1->setRect(0, 0, width, height);
38    fDirty0->setEmpty();
39}
40
41void SkPageFlipper::inval() {
42    fDirty1->setRect(0, 0, fWidth, fHeight);
43}
44
45void SkPageFlipper::inval(const SkIRect& rect) {
46    SkIRect r;
47    r.set(0, 0, fWidth, fHeight);
48    if (r.intersect(rect)) {
49        fDirty1->op(r, SkRegion::kUnion_Op);
50    }
51}
52
53void SkPageFlipper::inval(const SkRegion& rgn) {
54    SkRegion r;
55    r.setRect(0, 0, fWidth, fHeight);
56    if (r.op(rgn, SkRegion::kIntersect_Op)) {
57        fDirty1->op(r, SkRegion::kUnion_Op);
58    }
59}
60
61void SkPageFlipper::inval(const SkRect& rect, bool antialias) {
62    SkIRect r;
63    rect.round(&r);
64    if (antialias) {
65        r.inset(-1, -1);
66    }
67    this->inval(r);
68}
69
70const SkRegion& SkPageFlipper::update(SkRegion* copyBits) {
71    // Copy over anything new from page0 that isn't dirty in page1
72    copyBits->op(*fDirty0, *fDirty1, SkRegion::kDifference_Op);
73    SkTSwap<SkRegion*>(fDirty0, fDirty1);
74    fDirty1->setEmpty();
75    return *fDirty0;
76}
77