1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/thebes/gfxWindowsNativeDrawing.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,119 @@
1.4 +/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + * This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#ifndef _GFXWINDOWSNATIVEDRAWING_H_
1.10 +#define _GFXWINDOWSNATIVEDRAWING_H_
1.11 +
1.12 +#include <windows.h>
1.13 +
1.14 +#include "gfxContext.h"
1.15 +#include "gfxWindowsSurface.h"
1.16 +
1.17 +class gfxWindowsNativeDrawing {
1.18 +public:
1.19 +
1.20 + /* Flags for notifying this class what kind of operations the native
1.21 + * drawing supports
1.22 + */
1.23 +
1.24 + enum {
1.25 + /* Whether the native drawing can draw to a surface of content COLOR_ALPHA */
1.26 + CAN_DRAW_TO_COLOR_ALPHA = 1 << 0,
1.27 + CANNOT_DRAW_TO_COLOR_ALPHA = 0 << 0,
1.28 +
1.29 + /* Whether the native drawing can be scaled using SetWorldTransform */
1.30 + CAN_AXIS_ALIGNED_SCALE = 1 << 1,
1.31 + CANNOT_AXIS_ALIGNED_SCALE = 0 << 1,
1.32 +
1.33 + /* Whether the native drawing can be both scaled and rotated arbitrarily using SetWorldTransform */
1.34 + CAN_COMPLEX_TRANSFORM = 1 << 2,
1.35 + CANNOT_COMPLEX_TRANSFORM = 0 << 2,
1.36 +
1.37 + /* If we have to do transforms with cairo, should we use nearest-neighbour filtering? */
1.38 + DO_NEAREST_NEIGHBOR_FILTERING = 1 << 3,
1.39 + DO_BILINEAR_FILTERING = 0 << 3
1.40 + };
1.41 +
1.42 + /* Create native win32 drawing for a rectangle bounded by
1.43 + * nativeRect.
1.44 + *
1.45 + * Typical usage looks like:
1.46 + *
1.47 + * gfxWindowsNativeDrawing nativeDraw(ctx, destGfxRect, capabilities);
1.48 + * do {
1.49 + * HDC dc = nativeDraw.BeginNativeDrawing();
1.50 + * if (!dc)
1.51 + * return NS_ERROR_FAILURE;
1.52 + *
1.53 + * RECT winRect;
1.54 + * nativeDraw.TransformToNativeRect(rect, winRect);
1.55 + *
1.56 + * ... call win32 operations on HDC to draw to winRect ...
1.57 + *
1.58 + * nativeDraw.EndNativeDrawing();
1.59 + * } while (nativeDraw.ShouldRenderAgain());
1.60 + * nativeDraw.PaintToContext();
1.61 + */
1.62 + gfxWindowsNativeDrawing(gfxContext *ctx,
1.63 + const gfxRect& nativeRect,
1.64 + uint32_t nativeDrawFlags = CANNOT_DRAW_TO_COLOR_ALPHA |
1.65 + CANNOT_AXIS_ALIGNED_SCALE |
1.66 + CANNOT_COMPLEX_TRANSFORM |
1.67 + DO_BILINEAR_FILTERING);
1.68 +
1.69 + /* Returns a HDC which may be used for native drawing. This HDC is valid
1.70 + * until EndNativeDrawing is called; if it is used for drawing after that time,
1.71 + * the result is undefined. */
1.72 + HDC BeginNativeDrawing();
1.73 +
1.74 + /* Transform the native rect into something valid for rendering
1.75 + * to the HDC. This may or may not change RECT, depending on
1.76 + * whether SetWorldTransform is used or not. */
1.77 + void TransformToNativeRect(const gfxRect& r, RECT& rout);
1.78 +
1.79 + /* Marks the end of native drawing */
1.80 + void EndNativeDrawing();
1.81 +
1.82 + /* Returns true if the native drawing should be executed again */
1.83 + bool ShouldRenderAgain();
1.84 +
1.85 + /* Returns true if double pass alpha extraction is taking place. */
1.86 + bool IsDoublePass();
1.87 +
1.88 + /* Places the result to the context, if necessary */
1.89 + void PaintToContext();
1.90 +
1.91 +private:
1.92 +
1.93 + nsRefPtr<gfxContext> mContext;
1.94 + gfxRect mNativeRect;
1.95 + uint32_t mNativeDrawFlags;
1.96 +
1.97 + // what state the rendering is in
1.98 + uint8_t mRenderState;
1.99 +
1.100 + gfxPoint mDeviceOffset;
1.101 + nsRefPtr<gfxPattern> mBlackPattern, mWhitePattern;
1.102 +
1.103 + enum TransformType {
1.104 + TRANSLATION_ONLY,
1.105 + AXIS_ALIGNED_SCALE,
1.106 + COMPLEX
1.107 + };
1.108 +
1.109 + TransformType mTransformType;
1.110 + gfxPoint mTranslation;
1.111 + gfxSize mScale;
1.112 + XFORM mWorldTransform;
1.113 +
1.114 + // saved state
1.115 + nsRefPtr<gfxWindowsSurface> mWinSurface, mBlackSurface, mWhiteSurface;
1.116 + HDC mDC;
1.117 + XFORM mOldWorldTransform;
1.118 + POINT mOrigViewportOrigin;
1.119 + gfxIntSize mTempSurfaceSize;
1.120 +};
1.121 +
1.122 +#endif
