1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
3 /* This Source Code Form is subject to the terms of the Mozilla Public
4  * License, v. 2.0. If a copy of the MPL was not distributed with this
5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6 
7 #ifndef MOZILLA_GFX_EXTENDINPUTEFFECTD2D1_H_
8 #define MOZILLA_GFX_EXTENDINPUTEFFECTD2D1_H_
9 
10 #include <d2d1_1.h>
11 #include <d2d1effectauthor.h>
12 #include <d2d1effecthelpers.h>
13 
14 #include "2D.h"
15 #include "mozilla/Attributes.h"
16 
17 // {97143DC6-CBC4-4DD4-A8BA-13342B0BA46D}
18 DEFINE_GUID(CLSID_ExtendInputEffect, 0x5fb55c7c, 0xd795, 0x4ba3, 0xa9, 0x5c,
19             0x22, 0x82, 0x5d, 0x0c, 0x4d, 0xf7);
20 
21 namespace mozilla {
22 namespace gfx {
23 
24 enum { EXTENDINPUT_PROP_OUTPUT_RECT = 0 };
25 
26 // An effect type that passes through its input unchanged but sets the effect's
27 // output rect to a specified rect. Unlike the built-in Crop effect, the
28 // ExtendInput effect can extend the input rect, and not just make it smaller.
29 // The added margins are filled with transparent black.
30 // Some effects have different output depending on their input effect's output
31 // rect, for example the Border effect (which repeats the edges of its input
32 // effect's output rect) or the component transfer and color matrix effects
33 // (which can transform transparent pixels into non-transparent ones, but only
34 // inside their input effect's output rect).
35 class ExtendInputEffectD2D1 final : public ID2D1EffectImpl,
36                                     public ID2D1DrawTransform {
37  public:
38   // ID2D1EffectImpl
39   IFACEMETHODIMP Initialize(ID2D1EffectContext* pContextInternal,
40                             ID2D1TransformGraph* pTransformGraph);
41   IFACEMETHODIMP PrepareForRender(D2D1_CHANGE_TYPE changeType);
42   IFACEMETHODIMP SetGraph(ID2D1TransformGraph* pGraph);
43 
44   // IUnknown
45   IFACEMETHODIMP_(ULONG) AddRef();
46   IFACEMETHODIMP_(ULONG) Release();
47   IFACEMETHODIMP QueryInterface(REFIID riid, void** ppOutput);
48 
49   // ID2D1Transform
50   IFACEMETHODIMP MapInputRectsToOutputRect(
51       const D2D1_RECT_L* pInputRects, const D2D1_RECT_L* pInputOpaqueSubRects,
52       UINT32 inputRectCount, D2D1_RECT_L* pOutputRect,
53       D2D1_RECT_L* pOutputOpaqueSubRect);
54   IFACEMETHODIMP MapOutputRectToInputRects(const D2D1_RECT_L* pOutputRect,
55                                            D2D1_RECT_L* pInputRects,
56                                            UINT32 inputRectCount) const;
57   IFACEMETHODIMP MapInvalidRect(UINT32 inputIndex, D2D1_RECT_L invalidInputRect,
58                                 D2D1_RECT_L* pInvalidOutputRect) const;
59 
60   // ID2D1TransformNode
GetInputCount()61   IFACEMETHODIMP_(UINT32) GetInputCount() const { return 1; }
62 
63   // ID2D1DrawTransform
SetDrawInfo(ID2D1DrawInfo * pDrawInfo)64   IFACEMETHODIMP SetDrawInfo(ID2D1DrawInfo* pDrawInfo) { return S_OK; }
65 
66   static HRESULT Register(ID2D1Factory1* aFactory);
67   static void Unregister(ID2D1Factory1* aFactory);
68   static HRESULT __stdcall CreateEffect(IUnknown** aEffectImpl);
69 
SetOutputRect(D2D1_VECTOR_4F aOutputRect)70   HRESULT SetOutputRect(D2D1_VECTOR_4F aOutputRect) {
71     mOutputRect = aOutputRect;
72     return S_OK;
73   }
GetOutputRect()74   D2D1_VECTOR_4F GetOutputRect() const { return mOutputRect; }
75 
76  private:
77   ExtendInputEffectD2D1();
78 
79   uint32_t mRefCount;
80   D2D1_VECTOR_4F mOutputRect;
81 };
82 
83 }  // namespace gfx
84 }  // namespace mozilla
85 #undef SIMPLE_PROP
86 
87 #endif
88