gfx/2d/Scale.cpp@97036ab72558
gfx/2d/Scale.cpp
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
1 /* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5 #include "Scale.h"
7 #ifdef USE_SKIA
8 #include "HelpersSkia.h"
9 #include "skia/SkBitmap.h"
10 #include "image_operations.h"
11 #endif
13 namespace mozilla {
14 namespace gfx {
16 bool Scale(uint8_t* srcData, int32_t srcWidth, int32_t srcHeight, int32_t srcStride,
17 uint8_t* dstData, int32_t dstWidth, int32_t dstHeight, int32_t dstStride,
18 SurfaceFormat format)
19 {
20 #ifdef USE_SKIA
21 SkAlphaType alphaType;
22 if (format == SurfaceFormat::B8G8R8A8) {
23 alphaType = kPremul_SkAlphaType;
24 } else {
25 alphaType = kOpaque_SkAlphaType;
26 }
28 SkBitmap::Config config = GfxFormatToSkiaConfig(format);
30 SkBitmap imgSrc;
31 imgSrc.setConfig(config, srcWidth, srcHeight, srcStride, alphaType);
32 imgSrc.setPixels(srcData);
34 // Rescaler is compatible with 32 bpp only. Convert to RGB32 if needed.
35 if (config != SkBitmap::kARGB_8888_Config) {
36 imgSrc.copyTo(&imgSrc, kRGBA_8888_SkColorType);
37 }
39 // This returns an SkBitmap backed by dstData; since it also wrote to dstData,
40 // we don't need to look at that SkBitmap.
41 SkBitmap result = skia::ImageOperations::Resize(imgSrc,
42 skia::ImageOperations::RESIZE_BEST,
43 dstWidth, dstHeight,
44 dstData);
46 return !result.isNull();
47 #else
48 return false;
49 #endif
50 }
52 }
53 }
