diff -r 000000000000 -r 6474c204b198 gfx/2d/RadialGradientEffectD2D1.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/2d/RadialGradientEffectD2D1.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,386 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+  * This Source Code Form is subject to the terms of the Mozilla Public
+  * License, v. 2.0. If a copy of the MPL was not distributed with this
+  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "RadialGradientEffectD2D1.h"
+
+#include "Logging.h"
+
+#include "ShadersD2D1.h"
+#include "HelpersD2D.h"
+
+#include <vector>
+
+#define TEXTW(x) L##x
+#define XML(X) TEXTW(#X) // This macro creates a single string from multiple lines of text.
+
+static const PCWSTR kXmlDescription =
+    XML(
+        <?xml version='1.0'?>
+        <Effect>
+            <!-- System Properties -->
+            <Property name='DisplayName' type='string' value='RadialGradientEffect'/>
+            <Property name='Author' type='string' value='Mozilla'/>
+            <Property name='Category' type='string' value='Pattern effects'/>
+            <Property name='Description' type='string' value='This effect is used to render radial gradients in a manner compliant with the 2D Canvas specification.'/>
+            <Inputs>
+                <Input name='Geometry'/>
+            </Inputs>
+            <Property name='StopCollection' type='iunknown'>
+              <Property name='DisplayName' type='string' value='Gradient stop collection'/>
+            </Property>
+            <Property name='Center1' type='vector2'>
+              <Property name='DisplayName' type='string' value='Inner circle center'/>
+            </Property>
+            <Property name='Center2' type='vector2'>
+              <Property name='DisplayName' type='string' value='Outer circle center'/>
+            </Property>
+            <Property name='Radius1' type='float'>
+              <Property name='DisplayName' type='string' value='Inner circle radius'/>
+            </Property>
+            <Property name='Radius2' type='float'>
+              <Property name='DisplayName' type='string' value='Outer circle radius'/>
+            </Property>
+            <Property name='Transform' type='matrix3x2'>
+              <Property name='DisplayName' type='string' value='Transform applied to the pattern'/>
+            </Property>
+
+        </Effect>
+        );
+
+// {FB947CDA-718E-40CC-AE7B-D255830D7D14}
+static const GUID GUID_SampleRadialGradientPS =
+  {0xfb947cda, 0x718e, 0x40cc, {0xae, 0x7b, 0xd2, 0x55, 0x83, 0xd, 0x7d, 0x14}};
+// {2C468128-6546-453C-8E25-F2DF0DE10A0F}
+static const GUID GUID_SampleRadialGradientA0PS =
+  {0x2c468128, 0x6546, 0x453c, {0x8e, 0x25, 0xf2, 0xdf, 0xd, 0xe1, 0xa, 0xf}};
+
+namespace mozilla {
+namespace gfx {
+
+RadialGradientEffectD2D1::RadialGradientEffectD2D1()
+  : mRefCount(0)
+  , mCenter1(D2D1::Vector2F(0, 0))
+  , mCenter2(D2D1::Vector2F(0, 0))
+  , mRadius1(0)
+  , mRadius2(0)
+  , mTransform(D2D1::IdentityMatrix())
+
+{
+}
+
+IFACEMETHODIMP
+RadialGradientEffectD2D1::Initialize(ID2D1EffectContext* pContextInternal, ID2D1TransformGraph* pTransformGraph)
+{
+  HRESULT hr;
+  
+  hr = pContextInternal->LoadPixelShader(GUID_SampleRadialGradientPS, SampleRadialGradientPS, sizeof(SampleRadialGradientPS));
+
+  if (FAILED(hr)) {
+    return hr;
+  }
+
+  hr = pContextInternal->LoadPixelShader(GUID_SampleRadialGradientA0PS, SampleRadialGradientA0PS, sizeof(SampleRadialGradientA0PS));
+
+  if (FAILED(hr)) {
+    return hr;
+  }
+
+  hr = pTransformGraph->SetSingleTransformNode(this);
+
+  if (FAILED(hr)) {
+    return hr;
+  }
+
+  mEffectContext = pContextInternal;
+
+  return S_OK;
+}
+
+IFACEMETHODIMP
+RadialGradientEffectD2D1::PrepareForRender(D2D1_CHANGE_TYPE changeType)
+{
+  if (changeType == D2D1_CHANGE_TYPE_NONE) {
+    return S_OK;
+  }
+
+  // We'll need to inverse transform our pixel, precompute inverse here.
+  Matrix mat = ToMatrix(mTransform);
+  if (!mat.Invert()) {
+    // Singular
+    return S_OK;
+  }
+
+  if (!mStopCollection) {
+    return S_OK;
+  }
+
+  D2D1_POINT_2F dc = D2D1::Point2F(mCenter2.x - mCenter1.x, mCenter2.y - mCenter2.y);
+  float dr = mRadius2 - mRadius1;
+  float A = dc.x * dc.x + dc.y * dc.y - dr * dr;
+ 
+  HRESULT hr;
+  
+  if (A == 0) {
+    hr = mDrawInfo->SetPixelShader(GUID_SampleRadialGradientA0PS);
+  } else {
+    hr = mDrawInfo->SetPixelShader(GUID_SampleRadialGradientPS);
+  }
+
+  if (FAILED(hr)) {
+    return hr;
+  }
+
+  RefPtr<ID2D1ResourceTexture> tex = CreateGradientTexture();
+  hr = mDrawInfo->SetResourceTexture(1, tex);
+
+  if (FAILED(hr)) {
+    return hr;
+  }
+
+  struct PSConstantBuffer
+  {
+    float diff[3];
+    float padding;
+    float center1[2];
+    float A;
+    float radius1;
+    float sq_radius1;
+    float padding2[3];
+    float transform[8];
+  };
+
+  PSConstantBuffer buffer = { { dc.x, dc.y, dr }, 0,
+                              { mCenter1.x, mCenter1.y },
+                              A, mRadius1, mRadius1 * mRadius1,
+                              { 0, 0, 0 }, { mat._11, mat._21, mat._31, 0,
+                                             mat._12, mat._22, mat._32, 0 } };
+
+  hr = mDrawInfo->SetPixelShaderConstantBuffer((BYTE*)&buffer, sizeof(buffer));
+
+  if (FAILED(hr)) {
+    return hr;
+  }
+
+  return S_OK;
+}
+
+IFACEMETHODIMP
+RadialGradientEffectD2D1::SetGraph(ID2D1TransformGraph* pGraph)
+{
+  return pGraph->SetSingleTransformNode(this);
+}
+
+IFACEMETHODIMP_(ULONG)
+RadialGradientEffectD2D1::AddRef()
+{
+  return ++mRefCount;
+}
+
+IFACEMETHODIMP_(ULONG)
+RadialGradientEffectD2D1::Release()
+{
+  if (!--mRefCount) {
+    delete this;
+    return 0;
+  }
+  return mRefCount;
+}
+
+IFACEMETHODIMP
+RadialGradientEffectD2D1::QueryInterface(const IID &aIID, void **aPtr)
+{
+  if (!aPtr) {
+    return E_POINTER;
+  }
+
+  if (aIID == IID_IUnknown) {
+    *aPtr = static_cast<IUnknown*>(static_cast<ID2D1EffectImpl*>(this));
+  } else if (aIID == IID_ID2D1EffectImpl) {
+    *aPtr = static_cast<ID2D1EffectImpl*>(this);
+  } else if (aIID == IID_ID2D1DrawTransform) {
+    *aPtr = static_cast<ID2D1DrawTransform*>(this);
+  } else if (aIID == IID_ID2D1Transform) {
+    *aPtr = static_cast<ID2D1Transform*>(this);
+  } else if (aIID == IID_ID2D1TransformNode) {
+    *aPtr = static_cast<ID2D1TransformNode*>(this);
+  } else {
+    return E_NOINTERFACE;
+  }
+
+  static_cast<IUnknown*>(*aPtr)->AddRef();
+  return S_OK;
+}
+
+IFACEMETHODIMP
+RadialGradientEffectD2D1::MapInputRectsToOutputRect(const D2D1_RECT_L* pInputRects,
+                                                    const D2D1_RECT_L* pInputOpaqueSubRects,
+                                                    UINT32 inputRectCount,
+                                                    D2D1_RECT_L* pOutputRect,
+                                                    D2D1_RECT_L* pOutputOpaqueSubRect)
+{
+  if (inputRectCount != 1) {
+    return E_INVALIDARG;
+  }
+
+  *pOutputRect = *pInputRects;
+  *pOutputOpaqueSubRect = *pInputOpaqueSubRects;
+  return S_OK;
+}
+
+IFACEMETHODIMP
+RadialGradientEffectD2D1::MapOutputRectToInputRects(const D2D1_RECT_L* pOutputRect,
+                                                    D2D1_RECT_L* pInputRects,
+                                                    UINT32 inputRectCount) const
+{
+  if (inputRectCount != 1) {
+      return E_INVALIDARG;
+  }
+
+  *pInputRects = *pOutputRect;
+  return S_OK;
+}
+
+IFACEMETHODIMP
+RadialGradientEffectD2D1::MapInvalidRect(UINT32 inputIndex,
+                                         D2D1_RECT_L invalidInputRect,
+                                         D2D1_RECT_L* pInvalidOutputRect) const
+{
+  MOZ_ASSERT(inputIndex = 0);
+
+  *pInvalidOutputRect = invalidInputRect;
+  return S_OK;
+}
+
+IFACEMETHODIMP
+RadialGradientEffectD2D1::SetDrawInfo(ID2D1DrawInfo *pDrawInfo)
+{
+  mDrawInfo = pDrawInfo;
+  return S_OK;
+}
+
+HRESULT
+RadialGradientEffectD2D1::Register(ID2D1Factory1 *aFactory)
+{
+  D2D1_PROPERTY_BINDING bindings[] = {
+    D2D1_VALUE_TYPE_BINDING(L"StopCollection", &RadialGradientEffectD2D1::SetStopCollection,
+                            &RadialGradientEffectD2D1::GetStopCollection),
+    D2D1_VALUE_TYPE_BINDING(L"Center1", &RadialGradientEffectD2D1::SetCenter1, &RadialGradientEffectD2D1::GetCenter1),
+    D2D1_VALUE_TYPE_BINDING(L"Center2", &RadialGradientEffectD2D1::SetCenter2, &RadialGradientEffectD2D1::GetCenter2),
+    D2D1_VALUE_TYPE_BINDING(L"Radius1", &RadialGradientEffectD2D1::SetRadius1, &RadialGradientEffectD2D1::GetRadius1),
+    D2D1_VALUE_TYPE_BINDING(L"Radius2", &RadialGradientEffectD2D1::SetRadius2, &RadialGradientEffectD2D1::GetRadius2),
+    D2D1_VALUE_TYPE_BINDING(L"Transform", &RadialGradientEffectD2D1::SetTransform, &RadialGradientEffectD2D1::GetTransform)
+  };
+  HRESULT hr = aFactory->RegisterEffectFromString(CLSID_RadialGradientEffect, kXmlDescription, bindings, ARRAYSIZE(bindings), CreateEffect);
+
+  if (FAILED(hr)) {
+    gfxWarning() << "Failed to register radial gradient effect.";
+  }
+  return hr;
+}
+
+HRESULT __stdcall
+RadialGradientEffectD2D1::CreateEffect(IUnknown **aEffectImpl)
+{
+  *aEffectImpl = static_cast<ID2D1EffectImpl*>(new RadialGradientEffectD2D1());
+  (*aEffectImpl)->AddRef();
+
+  return S_OK;
+}
+
+HRESULT
+RadialGradientEffectD2D1::SetStopCollection(IUnknown *aStopCollection)
+{
+  if (SUCCEEDED(aStopCollection->QueryInterface((ID2D1GradientStopCollection**)byRef(mStopCollection)))) {
+    return S_OK;
+  }
+
+  return E_INVALIDARG;
+}
+
+TemporaryRef<ID2D1ResourceTexture>
+RadialGradientEffectD2D1::CreateGradientTexture()
+{
+  std::vector<D2D1_GRADIENT_STOP> rawStops;
+  rawStops.resize(mStopCollection->GetGradientStopCount());
+  mStopCollection->GetGradientStops(&rawStops.front(), rawStops.size());
+
+  std::vector<unsigned char> textureData;
+  textureData.resize(4096 * 4);
+  unsigned char *texData = &textureData.front();
+
+  float prevColorPos = 0;
+  float nextColorPos = 1.0f;
+  D2D1_COLOR_F prevColor = rawStops[0].color;
+  D2D1_COLOR_F nextColor = prevColor;
+
+  if (rawStops.size() >= 2) {
+    nextColor = rawStops[1].color;
+    nextColorPos = rawStops[1].position;
+  }
+
+  uint32_t stopPosition = 2;
+
+  // Not the most optimized way but this will do for now.
+  for (int i = 0; i < 4096; i++) {
+    // The 4095 seems a little counter intuitive, but we want the gradient
+    // color at offset 0 at the first pixel, and at offset 1.0f at the last
+    // pixel.
+    float pos = float(i) / 4095;
+
+    while (pos > nextColorPos) {
+      prevColor = nextColor;
+      prevColorPos = nextColorPos;
+      if (rawStops.size() > stopPosition) {
+        nextColor = rawStops[stopPosition].color;
+        nextColorPos = rawStops[stopPosition++].position;
+      } else {
+        nextColorPos = 1.0f;
+      }
+    }
+
+    float interp;
+    
+    if (nextColorPos != prevColorPos) {
+      interp = (pos - prevColorPos) / (nextColorPos - prevColorPos);
+    } else {
+      interp = 0;
+    }
+
+    Color newColor(prevColor.r + (nextColor.r - prevColor.r) * interp,
+                    prevColor.g + (nextColor.g - prevColor.g) * interp,
+                    prevColor.b + (nextColor.b - prevColor.b) * interp,
+                    prevColor.a + (nextColor.a - prevColor.a) * interp);
+
+    // Note D2D expects RGBA here!!
+    texData[i * 4] = (char)(255.0f * newColor.r);
+    texData[i * 4 + 1] = (char)(255.0f * newColor.g);
+    texData[i * 4 + 2] = (char)(255.0f * newColor.b);
+    texData[i * 4 + 3] = (char)(255.0f * newColor.a);
+  }
+
+  RefPtr<ID2D1ResourceTexture> tex;
+
+  UINT32 width = 4096;
+  UINT32 stride = 4096 * 4;
+  D2D1_RESOURCE_TEXTURE_PROPERTIES props;
+  props.dimensions = 1;
+  props.extents = &width;
+  props.channelDepth = D2D1_CHANNEL_DEPTH_4;
+  props.bufferPrecision = D2D1_BUFFER_PRECISION_8BPC_UNORM;
+  props.filter = D2D1_FILTER_MIN_MAG_MIP_LINEAR;
+  D2D1_EXTEND_MODE extendMode = mStopCollection->GetExtendMode();
+  props.extendModes = &extendMode;
+
+  HRESULT hr = mEffectContext->CreateResourceTexture(nullptr, &props, &textureData.front(), &stride, 4096 * 4, byRef(tex));
+
+  if (FAILED(hr)) {
+    gfxWarning() << "Failed to create resource texture: " << hr;
+  }
+
+  return tex;
+}
+
+}
+}