gfx/thebes/gfxWindowsNativeDrawing.h@97036ab72558 (annotated)
gfx/thebes/gfxWindowsNativeDrawing.h
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.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- |
| michael@0 | 2 | * This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 3 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 4 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 5 | |
| michael@0 | 6 | #ifndef _GFXWINDOWSNATIVEDRAWING_H_ |
| michael@0 | 7 | #define _GFXWINDOWSNATIVEDRAWING_H_ |
| michael@0 | 8 | |
| michael@0 | 9 | #include <windows.h> |
| michael@0 | 10 | |
| michael@0 | 11 | #include "gfxContext.h" |
| michael@0 | 12 | #include "gfxWindowsSurface.h" |
| michael@0 | 13 | |
| michael@0 | 14 | class gfxWindowsNativeDrawing { |
| michael@0 | 15 | public: |
| michael@0 | 16 | |
| michael@0 | 17 | /* Flags for notifying this class what kind of operations the native |
| michael@0 | 18 | * drawing supports |
| michael@0 | 19 | */ |
| michael@0 | 20 | |
| michael@0 | 21 | enum { |
| michael@0 | 22 | /* Whether the native drawing can draw to a surface of content COLOR_ALPHA */ |
| michael@0 | 23 | CAN_DRAW_TO_COLOR_ALPHA = 1 << 0, |
| michael@0 | 24 | CANNOT_DRAW_TO_COLOR_ALPHA = 0 << 0, |
| michael@0 | 25 | |
| michael@0 | 26 | /* Whether the native drawing can be scaled using SetWorldTransform */ |
| michael@0 | 27 | CAN_AXIS_ALIGNED_SCALE = 1 << 1, |
| michael@0 | 28 | CANNOT_AXIS_ALIGNED_SCALE = 0 << 1, |
| michael@0 | 29 | |
| michael@0 | 30 | /* Whether the native drawing can be both scaled and rotated arbitrarily using SetWorldTransform */ |
| michael@0 | 31 | CAN_COMPLEX_TRANSFORM = 1 << 2, |
| michael@0 | 32 | CANNOT_COMPLEX_TRANSFORM = 0 << 2, |
| michael@0 | 33 | |
| michael@0 | 34 | /* If we have to do transforms with cairo, should we use nearest-neighbour filtering? */ |
| michael@0 | 35 | DO_NEAREST_NEIGHBOR_FILTERING = 1 << 3, |
| michael@0 | 36 | DO_BILINEAR_FILTERING = 0 << 3 |
| michael@0 | 37 | }; |
| michael@0 | 38 | |
| michael@0 | 39 | /* Create native win32 drawing for a rectangle bounded by |
| michael@0 | 40 | * nativeRect. |
| michael@0 | 41 | * |
| michael@0 | 42 | * Typical usage looks like: |
| michael@0 | 43 | * |
| michael@0 | 44 | * gfxWindowsNativeDrawing nativeDraw(ctx, destGfxRect, capabilities); |
| michael@0 | 45 | * do { |
| michael@0 | 46 | * HDC dc = nativeDraw.BeginNativeDrawing(); |
| michael@0 | 47 | * if (!dc) |
| michael@0 | 48 | * return NS_ERROR_FAILURE; |
| michael@0 | 49 | * |
| michael@0 | 50 | * RECT winRect; |
| michael@0 | 51 | * nativeDraw.TransformToNativeRect(rect, winRect); |
| michael@0 | 52 | * |
| michael@0 | 53 | * ... call win32 operations on HDC to draw to winRect ... |
| michael@0 | 54 | * |
| michael@0 | 55 | * nativeDraw.EndNativeDrawing(); |
| michael@0 | 56 | * } while (nativeDraw.ShouldRenderAgain()); |
| michael@0 | 57 | * nativeDraw.PaintToContext(); |
| michael@0 | 58 | */ |
| michael@0 | 59 | gfxWindowsNativeDrawing(gfxContext *ctx, |
| michael@0 | 60 | const gfxRect& nativeRect, |
| michael@0 | 61 | uint32_t nativeDrawFlags = CANNOT_DRAW_TO_COLOR_ALPHA | |
| michael@0 | 62 | CANNOT_AXIS_ALIGNED_SCALE | |
| michael@0 | 63 | CANNOT_COMPLEX_TRANSFORM | |
| michael@0 | 64 | DO_BILINEAR_FILTERING); |
| michael@0 | 65 | |
| michael@0 | 66 | /* Returns a HDC which may be used for native drawing. This HDC is valid |
| michael@0 | 67 | * until EndNativeDrawing is called; if it is used for drawing after that time, |
| michael@0 | 68 | * the result is undefined. */ |
| michael@0 | 69 | HDC BeginNativeDrawing(); |
| michael@0 | 70 | |
| michael@0 | 71 | /* Transform the native rect into something valid for rendering |
| michael@0 | 72 | * to the HDC. This may or may not change RECT, depending on |
| michael@0 | 73 | * whether SetWorldTransform is used or not. */ |
| michael@0 | 74 | void TransformToNativeRect(const gfxRect& r, RECT& rout); |
| michael@0 | 75 | |
| michael@0 | 76 | /* Marks the end of native drawing */ |
| michael@0 | 77 | void EndNativeDrawing(); |
| michael@0 | 78 | |
| michael@0 | 79 | /* Returns true if the native drawing should be executed again */ |
| michael@0 | 80 | bool ShouldRenderAgain(); |
| michael@0 | 81 | |
| michael@0 | 82 | /* Returns true if double pass alpha extraction is taking place. */ |
| michael@0 | 83 | bool IsDoublePass(); |
| michael@0 | 84 | |
| michael@0 | 85 | /* Places the result to the context, if necessary */ |
| michael@0 | 86 | void PaintToContext(); |
| michael@0 | 87 | |
| michael@0 | 88 | private: |
| michael@0 | 89 | |
| michael@0 | 90 | nsRefPtr<gfxContext> mContext; |
| michael@0 | 91 | gfxRect mNativeRect; |
| michael@0 | 92 | uint32_t mNativeDrawFlags; |
| michael@0 | 93 | |
| michael@0 | 94 | // what state the rendering is in |
| michael@0 | 95 | uint8_t mRenderState; |
| michael@0 | 96 | |
| michael@0 | 97 | gfxPoint mDeviceOffset; |
| michael@0 | 98 | nsRefPtr<gfxPattern> mBlackPattern, mWhitePattern; |
| michael@0 | 99 | |
| michael@0 | 100 | enum TransformType { |
| michael@0 | 101 | TRANSLATION_ONLY, |
| michael@0 | 102 | AXIS_ALIGNED_SCALE, |
| michael@0 | 103 | COMPLEX |
| michael@0 | 104 | }; |
| michael@0 | 105 | |
| michael@0 | 106 | TransformType mTransformType; |
| michael@0 | 107 | gfxPoint mTranslation; |
| michael@0 | 108 | gfxSize mScale; |
| michael@0 | 109 | XFORM mWorldTransform; |
| michael@0 | 110 | |
| michael@0 | 111 | // saved state |
| michael@0 | 112 | nsRefPtr<gfxWindowsSurface> mWinSurface, mBlackSurface, mWhiteSurface; |
| michael@0 | 113 | HDC mDC; |
| michael@0 | 114 | XFORM mOldWorldTransform; |
| michael@0 | 115 | POINT mOrigViewportOrigin; |
| michael@0 | 116 | gfxIntSize mTempSurfaceSize; |
| michael@0 | 117 | }; |
| michael@0 | 118 | |
| michael@0 | 119 | #endif |
