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0fd9123eac
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120 lines
3.8 KiB
C++
120 lines
3.8 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef _GFXWINDOWSNATIVEDRAWING_H_
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#define _GFXWINDOWSNATIVEDRAWING_H_
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#include <windows.h>
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#include "gfxContext.h"
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#include "gfxWindowsSurface.h"
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class THEBES_API gfxWindowsNativeDrawing {
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public:
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/* Flags for notifying this class what kind of operations the native
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* drawing supports
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*/
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enum {
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/* Whether the native drawing can draw to a surface of content COLOR_ALPHA */
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CAN_DRAW_TO_COLOR_ALPHA = 1 << 0,
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CANNOT_DRAW_TO_COLOR_ALPHA = 0 << 0,
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/* Whether the native drawing can be scaled using SetWorldTransform */
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CAN_AXIS_ALIGNED_SCALE = 1 << 1,
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CANNOT_AXIS_ALIGNED_SCALE = 0 << 1,
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/* Whether the native drawing can be both scaled and rotated arbitrarily using SetWorldTransform */
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CAN_COMPLEX_TRANSFORM = 1 << 2,
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CANNOT_COMPLEX_TRANSFORM = 0 << 2,
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/* If we have to do transforms with cairo, should we use nearest-neighbour filtering? */
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DO_NEAREST_NEIGHBOR_FILTERING = 1 << 3,
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DO_BILINEAR_FILTERING = 0 << 3
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};
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/* Create native win32 drawing for a rectangle bounded by
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* nativeRect.
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*
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* Typical usage looks like:
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*
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* gfxWindowsNativeDrawing nativeDraw(ctx, destGfxRect, capabilities);
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* do {
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* HDC dc = nativeDraw.BeginNativeDrawing();
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* if (!dc)
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* return NS_ERROR_FAILURE;
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*
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* RECT winRect;
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* nativeDraw.TransformToNativeRect(rect, winRect);
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*
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* ... call win32 operations on HDC to draw to winRect ...
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*
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* nativeDraw.EndNativeDrawing();
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* } while (nativeDraw.ShouldRenderAgain());
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* nativeDraw.PaintToContext();
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*/
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gfxWindowsNativeDrawing(gfxContext *ctx,
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const gfxRect& nativeRect,
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uint32_t nativeDrawFlags = CANNOT_DRAW_TO_COLOR_ALPHA |
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CANNOT_AXIS_ALIGNED_SCALE |
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CANNOT_COMPLEX_TRANSFORM |
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DO_BILINEAR_FILTERING);
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/* Returns a HDC which may be used for native drawing. This HDC is valid
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* until EndNativeDrawing is called; if it is used for drawing after that time,
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* the result is undefined. */
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HDC BeginNativeDrawing();
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/* Transform the native rect into something valid for rendering
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* to the HDC. This may or may not change RECT, depending on
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* whether SetWorldTransform is used or not. */
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void TransformToNativeRect(const gfxRect& r, RECT& rout);
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/* Marks the end of native drawing */
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void EndNativeDrawing();
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/* Returns true if the native drawing should be executed again */
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bool ShouldRenderAgain();
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/* Returns true if double pass alpha extraction is taking place. */
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bool IsDoublePass();
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/* Places the result to the context, if necessary */
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void PaintToContext();
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private:
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nsRefPtr<gfxContext> mContext;
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gfxRect mNativeRect;
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uint32_t mNativeDrawFlags;
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// what state the rendering is in
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uint8_t mRenderState;
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gfxPoint mDeviceOffset;
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nsRefPtr<gfxPattern> mBlackPattern, mWhitePattern;
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enum TransformType {
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TRANSLATION_ONLY,
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AXIS_ALIGNED_SCALE,
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COMPLEX
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};
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TransformType mTransformType;
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gfxPoint mTranslation;
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gfxSize mScale;
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XFORM mWorldTransform;
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// saved state
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nsRefPtr<gfxWindowsSurface> mWinSurface, mBlackSurface, mWhiteSurface;
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HDC mDC;
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XFORM mOldWorldTransform;
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POINT mOrigViewportOrigin;
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gfxIntSize mTempSurfaceSize;
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};
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#endif
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