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gfx/src/nsRenderingContext.h@97036ab72558 (annotated)

gfx/src/nsRenderingContext.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 NSRENDERINGCONTEXT__H__
michael@0	7	#define NSRENDERINGCONTEXT__H__
michael@0	8
michael@0	9	#include <stdint.h> // for uint32_t
michael@0	10	#include <sys/types.h> // for int32_t
michael@0	11	#include "gfxContext.h" // for gfxContext
michael@0	12	#include "mozilla/Assertions.h" // for MOZ_ASSERT_HELPER2
michael@0	13	#include "mozilla/gfx/2D.h"
michael@0	14	#include "mozilla/gfx/UserData.h" // for UserData, UserDataKey
michael@0	15	#include "nsAutoPtr.h" // for nsRefPtr
michael@0	16	#include "nsBoundingMetrics.h" // for nsBoundingMetrics
michael@0	17	#include "nsColor.h" // for nscolor
michael@0	18	#include "nsCoord.h" // for nscoord, NSToIntRound
michael@0	19	#include "nsDeviceContext.h" // for nsDeviceContext
michael@0	20	#include "nsFontMetrics.h" // for nsFontMetrics
michael@0	21	#include "nsISupports.h" // for NS_INLINE_DECL_REFCOUNTING, etc
michael@0	22	#include "nsString.h" // for nsString
michael@0	23	#include "nscore.h" // for char16_t
michael@0	24
michael@0	25	class gfxASurface;
michael@0	26	class nsIntRegion;
michael@0	27	struct nsPoint;
michael@0	28	struct nsRect;
michael@0	29
michael@0	30	typedef enum {
michael@0	31	nsLineStyle_kNone = 0,
michael@0	32	nsLineStyle_kSolid = 1,
michael@0	33	nsLineStyle_kDashed = 2,
michael@0	34	nsLineStyle_kDotted = 3
michael@0	35	} nsLineStyle;
michael@0	36
michael@0	37	class nsRenderingContext MOZ_FINAL
michael@0	38	{
michael@0	39	typedef mozilla::gfx::UserData UserData;
michael@0	40	typedef mozilla::gfx::UserDataKey UserDataKey;
michael@0	41	typedef mozilla::gfx::DrawTarget DrawTarget;
michael@0	42
michael@0	43	public:
michael@0	44	nsRenderingContext() : mP2A(0.) {}
michael@0	45
michael@0	46	NS_INLINE_DECL_REFCOUNTING(nsRenderingContext)
michael@0	47
michael@0	48	void Init(nsDeviceContext* aContext, gfxASurface* aThebesSurface);
michael@0	49	void Init(nsDeviceContext* aContext, gfxContext* aThebesContext);
michael@0	50	void Init(nsDeviceContext* aContext, DrawTarget* aDrawTarget);
michael@0	51
michael@0	52	// These accessors will never return null.
michael@0	53	gfxContext *ThebesContext() { return mThebes; }
michael@0	54	DrawTarget *GetDrawTarget() { return mThebes->GetDrawTarget(); }
michael@0	55	nsDeviceContext *DeviceContext() { return mDeviceContext; }
michael@0	56	int32_t AppUnitsPerDevPixel() { return NSToIntRound(mP2A); }
michael@0	57
michael@0	58	// Graphics state
michael@0	59
michael@0	60	void PushState(void);
michael@0	61	void PopState(void);
michael@0	62	void IntersectClip(const nsRect& aRect);
michael@0	63	void SetClip(const nsIntRegion& aRegion);
michael@0	64	void SetLineStyle(nsLineStyle aLineStyle);
michael@0	65	void SetColor(nscolor aColor);
michael@0	66	void Translate(const nsPoint& aPt);
michael@0	67	void Scale(float aSx, float aSy);
michael@0	68
michael@0	69	class AutoPushTranslation {
michael@0	70	nsRenderingContext* mCtx;
michael@0	71	public:
michael@0	72	AutoPushTranslation(nsRenderingContext* aCtx, const nsPoint& aPt)
michael@0	73	: mCtx(aCtx) {
michael@0	74	mCtx->PushState();
michael@0	75	mCtx->Translate(aPt);
michael@0	76	}
michael@0	77	~AutoPushTranslation() {
michael@0	78	mCtx->PopState();
michael@0	79	}
michael@0	80	};
michael@0	81
michael@0	82	// Shapes
michael@0	83
michael@0	84	void DrawLine(const nsPoint& aStartPt, const nsPoint& aEndPt);
michael@0	85	void DrawLine(nscoord aX0, nscoord aY0, nscoord aX1, nscoord aY1);
michael@0	86	void DrawRect(const nsRect& aRect);
michael@0	87	void DrawRect(nscoord aX, nscoord aY, nscoord aWidth, nscoord aHeight);
michael@0	88	void DrawEllipse(nscoord aX, nscoord aY, nscoord aWidth, nscoord aHeight);
michael@0	89
michael@0	90	void FillRect(const nsRect& aRect);
michael@0	91	void FillRect(nscoord aX, nscoord aY, nscoord aWidth, nscoord aHeight);
michael@0	92	void FillPolygon(const nsPoint aPoints[], int32_t aNumPoints);
michael@0	93
michael@0	94	void FillEllipse(const nsRect& aRect);
michael@0	95	void FillEllipse(nscoord aX, nscoord aY, nscoord aWidth, nscoord aHeight);
michael@0	96
michael@0	97	void InvertRect(const nsRect& aRect);
michael@0	98
michael@0	99	// Text
michael@0	100
michael@0	101	void SetFont(nsFontMetrics *aFontMetrics);
michael@0	102	nsFontMetrics *FontMetrics() { return mFontMetrics; } // may be null
michael@0	103
michael@0	104	void SetTextRunRTL(bool aIsRTL);
michael@0	105
michael@0	106	nscoord GetWidth(char aC);
michael@0	107	nscoord GetWidth(char16_t aC);
michael@0	108	nscoord GetWidth(const nsString& aString);
michael@0	109	nscoord GetWidth(const char* aString);
michael@0	110	nscoord GetWidth(const char* aString, uint32_t aLength);
michael@0	111	nscoord GetWidth(const char16_t *aString, uint32_t aLength);
michael@0	112
michael@0	113	nsBoundingMetrics GetBoundingMetrics(const char16_t *aString,
michael@0	114	uint32_t aLength);
michael@0	115
michael@0	116	void DrawString(const nsString& aString, nscoord aX, nscoord aY);
michael@0	117	void DrawString(const char *aString, uint32_t aLength,
michael@0	118	nscoord aX, nscoord aY);
michael@0	119	void DrawString(const char16_t *aString, uint32_t aLength,
michael@0	120	nscoord aX, nscoord aY);
michael@0	121
michael@0	122	void AddUserData(UserDataKey *key, void *userData, void (*destroy)(void*)) {
michael@0	123	mUserData.Add(key, userData, destroy);
michael@0	124	}
michael@0	125	void *GetUserData(UserDataKey *key) {
michael@0	126	return mUserData.Get(key);
michael@0	127	}
michael@0	128	void *RemoveUserData(UserDataKey *key) {
michael@0	129	return mUserData.Remove(key);
michael@0	130	}
michael@0	131
michael@0	132	private:
michael@0	133	// Private destructor, to discourage deletion outside of Release():
michael@0	134	~nsRenderingContext()
michael@0	135	{
michael@0	136	}
michael@0	137
michael@0	138	int32_t GetMaxChunkLength();
michael@0	139
michael@0	140	nsRefPtr<gfxContext> mThebes;
michael@0	141	nsRefPtr<nsDeviceContext> mDeviceContext;
michael@0	142	nsRefPtr<nsFontMetrics> mFontMetrics;
michael@0	143
michael@0	144	double mP2A; // cached app units per device pixel value
michael@0	145
michael@0	146	UserData mUserData;
michael@0	147	};
michael@0	148
michael@0	149	#endif // NSRENDERINGCONTEXT__H__