зеркало из https://github.com/mozilla/gecko-dev.git
132 строки
3.8 KiB
C++
132 строки
3.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 _MOZILLA_GFX_BORROWED_CONTEXT_H
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#define _MOZILLA_GFX_BORROWED_CONTEXT_H
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#include "2D.h"
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#ifdef MOZ_X11
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# include <X11/Xlib.h>
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# include "X11UndefineNone.h"
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#endif
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namespace mozilla {
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namespace gfx {
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#ifdef MOZ_X11
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/* This is a helper class that let's you borrow an Xlib drawable from
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* a DrawTarget. This is used for drawing themed widgets.
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*
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* Callers should check the Xlib drawable after constructing the object
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* to see if it succeeded. The DrawTarget should not be used while
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* the drawable is borrowed. */
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class BorrowedXlibDrawable {
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public:
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BorrowedXlibDrawable()
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: mDT(nullptr),
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mDisplay(nullptr),
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mDrawable(X11None),
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mScreen(nullptr),
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mVisual(nullptr) {}
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explicit BorrowedXlibDrawable(DrawTarget* aDT)
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: mDT(nullptr),
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mDisplay(nullptr),
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mDrawable(X11None),
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mScreen(nullptr),
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mVisual(nullptr) {
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Init(aDT);
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}
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// We can optionally Init after construction in
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// case we don't know what the DT will be at construction
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// time.
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bool Init(DrawTarget* aDT);
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// The caller needs to call Finish if drawable is non-zero when
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// they are done with the context. This is currently explicit
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// instead of happening implicitly in the destructor to make
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// what's happening in the caller more clear. It also
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// let's you resume using the DrawTarget in the same scope.
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void Finish();
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~BorrowedXlibDrawable() { MOZ_ASSERT(!mDrawable); }
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Display* GetDisplay() const { return mDisplay; }
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Drawable GetDrawable() const { return mDrawable; }
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Screen* GetScreen() const { return mScreen; }
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Visual* GetVisual() const { return mVisual; }
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IntSize GetSize() const { return mSize; }
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Point GetOffset() const { return mOffset; }
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private:
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DrawTarget* mDT;
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Display* mDisplay;
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Drawable mDrawable;
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Screen* mScreen;
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Visual* mVisual;
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IntSize mSize;
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Point mOffset;
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};
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#endif
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#ifdef XP_DARWIN
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/* This is a helper class that let's you borrow a CGContextRef from a
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* DrawTargetCG. This is used for drawing themed widgets.
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*
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* Callers should check the cg member after constructing the object
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* to see if it succeeded. The DrawTarget should not be used while
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* the context is borrowed. */
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class BorrowedCGContext {
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public:
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BorrowedCGContext() : cg(nullptr), mDT(nullptr) {}
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explicit BorrowedCGContext(DrawTarget* aDT) : mDT(aDT) {
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MOZ_ASSERT(aDT, "Caller should check for nullptr");
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cg = BorrowCGContextFromDrawTarget(aDT);
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}
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// We can optionally Init after construction in
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// case we don't know what the DT will be at construction
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// time.
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CGContextRef Init(DrawTarget* aDT) {
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MOZ_ASSERT(aDT, "Caller should check for nullptr");
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MOZ_ASSERT(!mDT, "Can't initialize twice!");
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mDT = aDT;
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cg = BorrowCGContextFromDrawTarget(aDT);
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return cg;
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}
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// The caller needs to call Finish if cg is non-null when
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// they are done with the context. This is currently explicit
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// instead of happening implicitly in the destructor to make
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// what's happening in the caller more clear. It also
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// let's you resume using the DrawTarget in the same scope.
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void Finish() {
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if (cg) {
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ReturnCGContextToDrawTarget(mDT, cg);
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cg = nullptr;
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}
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}
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~BorrowedCGContext() { MOZ_ASSERT(!cg); }
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CGContextRef cg;
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private:
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static CGContextRef BorrowCGContextFromDrawTarget(DrawTarget* aDT);
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static void ReturnCGContextToDrawTarget(DrawTarget* aDT, CGContextRef cg);
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DrawTarget* mDT;
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};
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#endif
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} // namespace gfx
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} // namespace mozilla
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#endif // _MOZILLA_GFX_BORROWED_CONTEXT_H
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