gfx/skia/trunk/src/core/SkBitmap_scroll.cpp@129ffea94266 (annotated)
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.
| michael@0 | 1 | |
| michael@0 | 2 | /* |
| michael@0 | 3 | * Copyright 2011 Google Inc. |
| michael@0 | 4 | * |
| michael@0 | 5 | * Use of this source code is governed by a BSD-style license that can be |
| michael@0 | 6 | * found in the LICENSE file. |
| michael@0 | 7 | */ |
| michael@0 | 8 | #include "SkBitmap.h" |
| michael@0 | 9 | #include "SkRegion.h" |
| michael@0 | 10 | |
| michael@0 | 11 | bool SkBitmap::scrollRect(const SkIRect* subset, int dx, int dy, |
| michael@0 | 12 | SkRegion* inval) const |
| michael@0 | 13 | { |
| michael@0 | 14 | if (this->isImmutable() || kUnknown_SkColorType == this->colorType()) { |
| michael@0 | 15 | return false; |
| michael@0 | 16 | } |
| michael@0 | 17 | |
| michael@0 | 18 | if (NULL != subset) { |
| michael@0 | 19 | SkBitmap tmp; |
| michael@0 | 20 | |
| michael@0 | 21 | return this->extractSubset(&tmp, *subset) && |
| michael@0 | 22 | // now call again with no rectangle |
| michael@0 | 23 | tmp.scrollRect(NULL, dx, dy, inval); |
| michael@0 | 24 | } |
| michael@0 | 25 | |
| michael@0 | 26 | int shift = this->bytesPerPixel() >> 1; |
| michael@0 | 27 | int width = this->width(); |
| michael@0 | 28 | int height = this->height(); |
| michael@0 | 29 | |
| michael@0 | 30 | // check if there's nothing to do |
| michael@0 | 31 | if ((dx | dy) == 0 || width <= 0 || height <= 0) { |
| michael@0 | 32 | if (NULL != inval) { |
| michael@0 | 33 | inval->setEmpty(); |
| michael@0 | 34 | } |
| michael@0 | 35 | return true; |
| michael@0 | 36 | } |
| michael@0 | 37 | |
| michael@0 | 38 | // compute the inval region now, before we see if there are any pixels |
| michael@0 | 39 | if (NULL != inval) { |
| michael@0 | 40 | SkIRect r; |
| michael@0 | 41 | |
| michael@0 | 42 | r.set(0, 0, width, height); |
| michael@0 | 43 | // initial the region with the entire bounds |
| michael@0 | 44 | inval->setRect(r); |
| michael@0 | 45 | // do the "scroll" |
| michael@0 | 46 | r.offset(dx, dy); |
| michael@0 | 47 | |
| michael@0 | 48 | // check if we scrolled completely away |
| michael@0 | 49 | if (!SkIRect::Intersects(r, inval->getBounds())) { |
| michael@0 | 50 | // inval has already been updated... |
| michael@0 | 51 | return true; |
| michael@0 | 52 | } |
| michael@0 | 53 | |
| michael@0 | 54 | // compute the dirty area |
| michael@0 | 55 | inval->op(r, SkRegion::kDifference_Op); |
| michael@0 | 56 | } |
| michael@0 | 57 | |
| michael@0 | 58 | SkAutoLockPixels alp(*this); |
| michael@0 | 59 | // if we have no pixels, just return (inval is already updated) |
| michael@0 | 60 | // don't call readyToDraw(), since we don't require a colortable per se |
| michael@0 | 61 | if (this->getPixels() == NULL) { |
| michael@0 | 62 | return true; |
| michael@0 | 63 | } |
| michael@0 | 64 | |
| michael@0 | 65 | char* dst = (char*)this->getPixels(); |
| michael@0 | 66 | const char* src = dst; |
| michael@0 | 67 | int rowBytes = (int)this->rowBytes(); // need rowBytes to be signed |
| michael@0 | 68 | |
| michael@0 | 69 | if (dy <= 0) { |
| michael@0 | 70 | src -= dy * rowBytes; |
| michael@0 | 71 | height += dy; |
| michael@0 | 72 | } else { |
| michael@0 | 73 | dst += dy * rowBytes; |
| michael@0 | 74 | height -= dy; |
| michael@0 | 75 | // now jump src/dst to the last scanline |
| michael@0 | 76 | src += (height - 1) * rowBytes; |
| michael@0 | 77 | dst += (height - 1) * rowBytes; |
| michael@0 | 78 | // now invert rowbytes so we copy backwards in the loop |
| michael@0 | 79 | rowBytes = -rowBytes; |
| michael@0 | 80 | } |
| michael@0 | 81 | |
| michael@0 | 82 | if (dx <= 0) { |
| michael@0 | 83 | src -= dx << shift; |
| michael@0 | 84 | width += dx; |
| michael@0 | 85 | } else { |
| michael@0 | 86 | dst += dx << shift; |
| michael@0 | 87 | width -= dx; |
| michael@0 | 88 | } |
| michael@0 | 89 | |
| michael@0 | 90 | // If the X-translation would push it completely beyond the region, |
| michael@0 | 91 | // then there's nothing to draw. |
| michael@0 | 92 | if (width <= 0) { |
| michael@0 | 93 | return true; |
| michael@0 | 94 | } |
| michael@0 | 95 | |
| michael@0 | 96 | width <<= shift; // now width is the number of bytes to move per line |
| michael@0 | 97 | while (--height >= 0) { |
| michael@0 | 98 | memmove(dst, src, width); |
| michael@0 | 99 | dst += rowBytes; |
| michael@0 | 100 | src += rowBytes; |
| michael@0 | 101 | } |
| michael@0 | 102 | |
| michael@0 | 103 | this->notifyPixelsChanged(); |
| michael@0 | 104 | return true; |
| michael@0 | 105 | } |
