gfx/skia/trunk/src/core/SkBitmap_scroll.cpp@129ffea94266
gfx/skia/trunk/src/core/SkBitmap_scroll.cpp
Sat, 03 Jan 2015 20:18:00 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Sat, 03 Jan 2015 20:18:00 +0100
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
- permissions
- -rw-r--r--
Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.
2 /*
3 * Copyright 2011 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 #include "SkBitmap.h"
9 #include "SkRegion.h"
11 bool SkBitmap::scrollRect(const SkIRect* subset, int dx, int dy,
12 SkRegion* inval) const
13 {
14 if (this->isImmutable() || kUnknown_SkColorType == this->colorType()) {
15 return false;
16 }
18 if (NULL != subset) {
19 SkBitmap tmp;
21 return this->extractSubset(&tmp, *subset) &&
22 // now call again with no rectangle
23 tmp.scrollRect(NULL, dx, dy, inval);
24 }
26 int shift = this->bytesPerPixel() >> 1;
27 int width = this->width();
28 int height = this->height();
30 // check if there's nothing to do
31 if ((dx | dy) == 0 || width <= 0 || height <= 0) {
32 if (NULL != inval) {
33 inval->setEmpty();
34 }
35 return true;
36 }
38 // compute the inval region now, before we see if there are any pixels
39 if (NULL != inval) {
40 SkIRect r;
42 r.set(0, 0, width, height);
43 // initial the region with the entire bounds
44 inval->setRect(r);
45 // do the "scroll"
46 r.offset(dx, dy);
48 // check if we scrolled completely away
49 if (!SkIRect::Intersects(r, inval->getBounds())) {
50 // inval has already been updated...
51 return true;
52 }
54 // compute the dirty area
55 inval->op(r, SkRegion::kDifference_Op);
56 }
58 SkAutoLockPixels alp(*this);
59 // if we have no pixels, just return (inval is already updated)
60 // don't call readyToDraw(), since we don't require a colortable per se
61 if (this->getPixels() == NULL) {
62 return true;
63 }
65 char* dst = (char*)this->getPixels();
66 const char* src = dst;
67 int rowBytes = (int)this->rowBytes(); // need rowBytes to be signed
69 if (dy <= 0) {
70 src -= dy * rowBytes;
71 height += dy;
72 } else {
73 dst += dy * rowBytes;
74 height -= dy;
75 // now jump src/dst to the last scanline
76 src += (height - 1) * rowBytes;
77 dst += (height - 1) * rowBytes;
78 // now invert rowbytes so we copy backwards in the loop
79 rowBytes = -rowBytes;
80 }
82 if (dx <= 0) {
83 src -= dx << shift;
84 width += dx;
85 } else {
86 dst += dx << shift;
87 width -= dx;
88 }
90 // If the X-translation would push it completely beyond the region,
91 // then there's nothing to draw.
92 if (width <= 0) {
93 return true;
94 }
96 width <<= shift; // now width is the number of bytes to move per line
97 while (--height >= 0) {
98 memmove(dst, src, width);
99 dst += rowBytes;
100 src += rowBytes;
101 }
103 this->notifyPixelsChanged();
104 return true;
105 }
