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