DirectWrite font host for skia.
https://codereview.appspot.com/5417063/


git-svn-id: http://skia.googlecode.com/svn/trunk@5128 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/utils/win/SkDWriteFontFileStream.cpp b/src/utils/win/SkDWriteFontFileStream.cpp
new file mode 100644
index 0000000..1569158
--- /dev/null
+++ b/src/utils/win/SkDWriteFontFileStream.cpp
@@ -0,0 +1,210 @@
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkTypes.h"
+#include "SkDWriteFontFileStream.h"
+#include "SkHRESULT.h"
+
+#include <dwrite.h>
+#include <limits>
+
+///////////////////////////////////////////////////////////////////////////////
+//  SkIDWriteFontFileStream
+
+SkDWriteFontFileStream::SkDWriteFontFileStream(IDWriteFontFileStream* fontFileStream)
+    : fFontFileStream(fontFileStream)
+    , fPos(0)
+    , fLockedMemory(NULL)
+    , fFragmentLock(NULL) {
+    fontFileStream->AddRef();
+}
+
+SkDWriteFontFileStream::~SkDWriteFontFileStream() {
+    if (fFragmentLock) {
+        fFontFileStream->ReleaseFileFragment(fFragmentLock);
+    }
+}
+
+const void* SkDWriteFontFileStream::getMemoryBase() {
+    if (fLockedMemory) {
+        return fLockedMemory;
+    }
+
+    UINT64 fileSize;
+    HRNM(fFontFileStream->GetFileSize(&fileSize), "Could not get file size");
+    HRNM(fFontFileStream->ReadFileFragment(&fLockedMemory, 0, fileSize, &fFragmentLock),
+         "Could not lock file fragment.");
+    return fLockedMemory;
+}
+
+bool SkDWriteFontFileStream::rewind() {
+    fPos = 0;
+    return true;
+}
+
+size_t SkDWriteFontFileStream::read(void* buffer, size_t size) {
+    HRESULT hr = S_OK;
+
+    if (NULL == buffer) {
+        UINT64 realFileSize = 0;
+        hr = fFontFileStream->GetFileSize(&realFileSize);
+        if (realFileSize > (std::numeric_limits<size_t>::max)()) {
+            return 0;
+        }
+        size_t fileSize = static_cast<size_t>(realFileSize);
+        if (size == 0) {
+            return fileSize;
+        } else {
+            if (fPos + size > fileSize) {
+                size_t skipped = fileSize - fPos;
+                fPos = fileSize;
+                return skipped;
+            } else {
+                fPos += size;
+                return size;
+            }
+        }
+    }
+
+    const void* start;
+    void* fragmentLock;
+    hr = fFontFileStream->ReadFileFragment(&start, fPos, size, &fragmentLock);
+    if (SUCCEEDED(hr)) {
+        memcpy(buffer, start, size);
+        fFontFileStream->ReleaseFileFragment(fragmentLock);
+        fPos += size;
+        return size;
+    }
+
+    //The read may have failed because we asked for too much data.
+    UINT64 realFileSize = 0;
+    hr = fFontFileStream->GetFileSize(&realFileSize);
+    if (realFileSize > (std::numeric_limits<size_t>::max)()) {
+        return 0;
+    }
+    size_t fileSize = static_cast<size_t>(realFileSize);
+    if (fPos + size > fileSize) {
+        size_t read = fileSize - fPos;
+        hr = fFontFileStream->ReadFileFragment(&start, fPos, read, &fragmentLock);
+        if (SUCCEEDED(hr)) {
+            memcpy(buffer, start, read);
+            fFontFileStream->ReleaseFileFragment(fragmentLock);
+            fPos = fileSize;
+            return read;
+        }
+        return 0;
+    } else {
+        //This means we were within bounds, but failed for some other reason.
+        return 0;
+    }
+}
+
+
+///////////////////////////////////////////////////////////////////////////////
+//  SkIDWriteFontFileStreamWrapper
+
+HRESULT SkDWriteFontFileStreamWrapper::Create(SkStream* stream, SkDWriteFontFileStreamWrapper** streamFontFileStream) {
+    *streamFontFileStream = new SkDWriteFontFileStreamWrapper(stream);
+    if (NULL == streamFontFileStream) {
+        return E_OUTOFMEMORY;
+    }
+    return S_OK;
+}
+
+SkDWriteFontFileStreamWrapper::SkDWriteFontFileStreamWrapper(SkStream* stream)
+    : fRefCount(1), fStream(stream) {
+    stream->ref();
+}
+
+HRESULT STDMETHODCALLTYPE SkDWriteFontFileStreamWrapper::QueryInterface(REFIID iid, void** ppvObject) {
+    if (iid == IID_IUnknown || iid == __uuidof(IDWriteFontFileStream)) {
+        *ppvObject = this;
+        AddRef();
+        return S_OK;
+    } else {
+        *ppvObject = NULL;
+        return E_NOINTERFACE;
+    }
+}
+
+ULONG STDMETHODCALLTYPE SkDWriteFontFileStreamWrapper::AddRef() {
+    return InterlockedIncrement(&fRefCount);
+}
+
+ULONG STDMETHODCALLTYPE SkDWriteFontFileStreamWrapper::Release() {
+    ULONG newCount = InterlockedDecrement(&fRefCount);
+    if (0 == newCount) {
+        delete this;
+    }
+    return newCount;
+}
+
+HRESULT STDMETHODCALLTYPE SkDWriteFontFileStreamWrapper::ReadFileFragment(
+    void const** fragmentStart,
+    UINT64 fileOffset,
+    UINT64 fragmentSize,
+    void** fragmentContext)
+{
+    // The loader is responsible for doing a bounds check.
+    UINT64 fileSize;
+    this->GetFileSize(&fileSize);
+    if (fileOffset > fileSize || fragmentSize > fileSize - fileOffset) {
+        *fragmentStart = NULL;
+        *fragmentContext = NULL;
+        return E_FAIL;
+    }
+
+    if (fileOffset + fragmentSize > (std::numeric_limits<size_t>::max)()) {
+        return E_FAIL;
+    }
+
+    const void* data = fStream->getMemoryBase();
+    if (NULL != data) {
+        *fragmentStart = static_cast<BYTE const*>(data) + static_cast<size_t>(fileOffset);
+        *fragmentContext = NULL;
+
+    } else {
+        //May be called from multiple threads.
+        SkAutoMutexAcquire ama(fStreamMutex);
+
+        *fragmentStart = NULL;
+        *fragmentContext = NULL;
+
+        if (!fStream->rewind()) {
+            return E_FAIL;
+        }
+        if (fStream->skip(static_cast<size_t>(fileOffset)) != fileOffset) {
+            return E_FAIL;
+        }
+        SkAutoTDeleteArray<uint8_t> streamData(new uint8_t[static_cast<size_t>(fragmentSize)]);
+        if (fStream->read(streamData.get(), static_cast<size_t>(fragmentSize)) != fragmentSize) {
+            return E_FAIL;
+        }
+
+        *fragmentStart = streamData.get();
+        *fragmentContext = streamData.detach();
+    }
+    return S_OK;
+}
+
+void STDMETHODCALLTYPE SkDWriteFontFileStreamWrapper::ReleaseFileFragment(void* fragmentContext) {
+    if (NULL == fragmentContext) {
+        return;
+    }
+    delete [] fragmentContext;
+}
+
+HRESULT STDMETHODCALLTYPE SkDWriteFontFileStreamWrapper::GetFileSize(UINT64* fileSize) {
+    *fileSize = fStream->getLength();
+    return S_OK;
+}
+
+HRESULT STDMETHODCALLTYPE SkDWriteFontFileStreamWrapper::GetLastWriteTime(UINT64* lastWriteTime) {
+    // The concept of last write time does not apply to this loader.
+    *lastWriteTime = 0;
+    return E_NOTIMPL;
+}
diff --git a/src/utils/win/SkDWriteFontFileStream.h b/src/utils/win/SkDWriteFontFileStream.h
new file mode 100644
index 0000000..cd5787e
--- /dev/null
+++ b/src/utils/win/SkDWriteFontFileStream.h
@@ -0,0 +1,69 @@
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkDWriteFontFileStream_DEFINED
+#define SkDWriteFontFileStream_DEFINED
+
+#include "SkTypes.h"
+
+#include "SkStream.h"
+#include "SkTScopedComPtr.h"
+
+#include <dwrite.h>
+
+/**
+ *  An SkStream backed by an IDWriteFontFileStream.
+ *  This allows Skia code to read an IDWriteFontFileStream.
+ */
+class SkDWriteFontFileStream : public SkStream {
+public:
+    explicit SkDWriteFontFileStream(IDWriteFontFileStream* fontFileStream);
+    virtual ~SkDWriteFontFileStream();
+    
+    virtual bool rewind() SK_OVERRIDE;
+    virtual size_t read(void* buffer, size_t size) SK_OVERRIDE;
+    virtual const void* getMemoryBase() SK_OVERRIDE;
+
+private:
+    SkTScopedComPtr<IDWriteFontFileStream> fFontFileStream;
+    size_t fPos;
+    const void* fLockedMemory;
+    void* fFragmentLock;
+};
+
+/**
+ *  An IDWriteFontFileStream backed by an SkStream.
+ *  This allows DirectWrite to read an SkStream.
+ */
+class SkDWriteFontFileStreamWrapper : public IDWriteFontFileStream {
+public:
+    // IUnknown methods
+    virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, void** ppvObject);
+    virtual ULONG STDMETHODCALLTYPE AddRef();
+    virtual ULONG STDMETHODCALLTYPE Release();
+
+    // IDWriteFontFileStream methods
+    virtual HRESULT STDMETHODCALLTYPE ReadFileFragment(
+        void const** fragmentStart,
+        UINT64 fileOffset,
+        UINT64 fragmentSize,
+        void** fragmentContext);
+
+    virtual void STDMETHODCALLTYPE ReleaseFileFragment(void* fragmentContext);
+    virtual HRESULT STDMETHODCALLTYPE GetFileSize(UINT64* fileSize);
+    virtual HRESULT STDMETHODCALLTYPE GetLastWriteTime(UINT64* lastWriteTime);
+
+    static HRESULT Create(SkStream* stream, SkDWriteFontFileStreamWrapper** streamFontFileStream);
+
+private:
+    explicit SkDWriteFontFileStreamWrapper(SkStream* stream);
+
+    ULONG fRefCount;
+    SkAutoTUnref<SkStream> fStream;
+    SkMutex fStreamMutex;
+};
+#endif
diff --git a/src/utils/win/SkDWriteGeometrySink.cpp b/src/utils/win/SkDWriteGeometrySink.cpp
new file mode 100644
index 0000000..4aec3bb
--- /dev/null
+++ b/src/utils/win/SkDWriteGeometrySink.cpp
@@ -0,0 +1,146 @@
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkTypes.h"
+
+#include "SkDWriteGeometrySink.h"
+#include "SkFloatUtils.h"
+#include "SkPath.h"
+
+#include <dwrite.h>
+#include <d2d1.h>
+
+SkDWriteGeometrySink::SkDWriteGeometrySink(SkPath* path) : fRefCount(1), fPath(path) { }
+
+SkDWriteGeometrySink::~SkDWriteGeometrySink() { }
+
+HRESULT STDMETHODCALLTYPE SkDWriteGeometrySink::QueryInterface(REFIID iid, void **object) {
+    if (NULL == object) {
+        return E_INVALIDARG;
+    }
+    if (iid == __uuidof(IUnknown) || iid == __uuidof(IDWriteGeometrySink)) {
+        *object = static_cast<IDWriteGeometrySink*>(this);
+        this->AddRef();
+        return S_OK;
+    } else {
+        *object = NULL;
+        return E_NOINTERFACE; 
+    }
+}
+
+ULONG STDMETHODCALLTYPE SkDWriteGeometrySink::AddRef(void) {
+    return static_cast<ULONG>(InterlockedIncrement(&fRefCount));
+}
+
+ULONG STDMETHODCALLTYPE SkDWriteGeometrySink::Release(void) {
+    ULONG res = static_cast<ULONG>(InterlockedDecrement(&fRefCount));
+    if (0 == res) {
+        delete this;
+    }
+    return res;
+}
+
+void STDMETHODCALLTYPE SkDWriteGeometrySink::SetFillMode(D2D1_FILL_MODE fillMode) {
+    switch (fillMode) {
+    case D2D1_FILL_MODE_ALTERNATE:
+        fPath->setFillType(SkPath::kEvenOdd_FillType);
+        break;
+    case D2D1_FILL_MODE_WINDING:
+        fPath->setFillType(SkPath::kWinding_FillType);
+        break;
+    default:
+        SkASSERT(!"Unknown D2D1_FILL_MODE.");
+        break;
+    }
+}
+
+void STDMETHODCALLTYPE SkDWriteGeometrySink::SetSegmentFlags(D2D1_PATH_SEGMENT vertexFlags) {
+    if (vertexFlags == D2D1_PATH_SEGMENT_NONE || vertexFlags == D2D1_PATH_SEGMENT_FORCE_ROUND_LINE_JOIN) {
+        SkASSERT(!"Invalid D2D1_PATH_SEGMENT value.");
+    }
+}
+
+void STDMETHODCALLTYPE SkDWriteGeometrySink::BeginFigure(D2D1_POINT_2F startPoint, D2D1_FIGURE_BEGIN figureBegin) {
+    fPath->moveTo(SkFloatToScalar(startPoint.x), SkFloatToScalar(startPoint.y));
+    if (figureBegin == D2D1_FIGURE_BEGIN_HOLLOW) {
+        SkASSERT(!"Invalid D2D1_FIGURE_BEGIN value.");
+    }
+}
+
+void STDMETHODCALLTYPE SkDWriteGeometrySink::AddLines(const D2D1_POINT_2F *points, UINT pointsCount) {
+    for (const D2D1_POINT_2F *end = &points[pointsCount]; points < end; ++points) {
+        fPath->lineTo(SkFloatToScalar(points->x), SkFloatToScalar(points->y));
+    }
+}
+
+static bool approximately_equal(float a, float b) {
+    const SkFloatingPoint<float, 10> lhs(a), rhs(b);
+    return lhs.AlmostEquals(rhs);
+}
+
+typedef struct {
+    float x;
+    float y;
+} Cubic[4], Quadratic[3];
+
+static bool check_quadratic(const Cubic& cubic, Quadratic& reduction) {
+    float dx10 = cubic[1].x - cubic[0].x;
+    float dx23 = cubic[2].x - cubic[3].x;
+    float midX = cubic[0].x + dx10 * 3 / 2;
+    //NOTE: !approximately_equal(midX - cubic[3].x, dx23 * 3 / 2)
+    //does not work as subnormals get in between the left side and 0.
+    if (!approximately_equal(midX, (dx23 * 3 / 2) + cubic[3].x)) {
+        return false;
+    }
+    float dy10 = cubic[1].y - cubic[0].y;
+    float dy23 = cubic[2].y - cubic[3].y;
+    float midY = cubic[0].y + dy10 * 3 / 2;
+    if (!approximately_equal(midY, (dy23 * 3 / 2) + cubic[3].y)) {
+        return false;
+    }
+    reduction[0] = cubic[0];
+    reduction[1].x = midX;
+    reduction[1].y = midY;
+    reduction[2] = cubic[3];
+    return true;
+}
+
+void STDMETHODCALLTYPE SkDWriteGeometrySink::AddBeziers(const D2D1_BEZIER_SEGMENT *beziers, UINT beziersCount) {
+    SkPoint lastPt;
+    fPath->getLastPt(&lastPt);
+    D2D1_POINT_2F prevPt = { SkScalarToFloat(lastPt.fX), SkScalarToFloat(lastPt.fY) };
+
+    for (const D2D1_BEZIER_SEGMENT *end = &beziers[beziersCount]; beziers < end; ++beziers) {
+        Cubic cubic = { { prevPt.x, prevPt.y },
+                        { beziers->point1.x, beziers->point1.y },
+                        { beziers->point2.x, beziers->point2.y },
+                        { beziers->point3.x, beziers->point3.y }, };
+        Quadratic quadratic;
+        if (check_quadratic(cubic, quadratic)) {
+            fPath->quadTo(SkFloatToScalar(quadratic[1].x), SkFloatToScalar(quadratic[1].y),
+                          SkFloatToScalar(quadratic[2].x), SkFloatToScalar(quadratic[2].y));
+        } else {
+            fPath->cubicTo(SkFloatToScalar(beziers->point1.x), SkFloatToScalar(beziers->point1.y),
+                           SkFloatToScalar(beziers->point2.x), SkFloatToScalar(beziers->point2.y),
+                           SkFloatToScalar(beziers->point3.x), SkFloatToScalar(beziers->point3.y));
+        }
+        prevPt = beziers->point3;
+    }
+}
+
+void STDMETHODCALLTYPE SkDWriteGeometrySink::EndFigure(D2D1_FIGURE_END figureEnd) {
+    fPath->close();
+}
+
+HRESULT SkDWriteGeometrySink::Close() {
+    return S_OK;
+}
+
+HRESULT SkDWriteGeometrySink::Create(SkPath* path, IDWriteGeometrySink** geometryToPath) {
+    *geometryToPath = new SkDWriteGeometrySink(path);
+    return S_OK;
+}
diff --git a/src/utils/win/SkDWriteGeometrySink.h b/src/utils/win/SkDWriteGeometrySink.h
new file mode 100644
index 0000000..99a3262
--- /dev/null
+++ b/src/utils/win/SkDWriteGeometrySink.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkDWriteToPath_DEFINED
+#define SkDWriteToPath_DEFINED
+
+#include "SkTypes.h"
+
+class SkPath;
+
+#include <dwrite.h>
+#include <d2d1.h>
+
+class SkDWriteGeometrySink : public IDWriteGeometrySink {
+private:
+    LONG fRefCount;
+    SkPath* fPath;
+
+    SkDWriteGeometrySink(const SkDWriteGeometrySink&);
+    SkDWriteGeometrySink& operator=(const SkDWriteGeometrySink&);
+
+protected:
+    explicit SkDWriteGeometrySink(SkPath* path);
+    virtual ~SkDWriteGeometrySink();
+
+public:
+    virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, void **object) SK_OVERRIDE;
+    virtual ULONG STDMETHODCALLTYPE AddRef(void) SK_OVERRIDE;
+    virtual ULONG STDMETHODCALLTYPE Release(void) SK_OVERRIDE;
+
+    virtual void STDMETHODCALLTYPE SetFillMode(D2D1_FILL_MODE fillMode) SK_OVERRIDE;
+    virtual void STDMETHODCALLTYPE SetSegmentFlags(D2D1_PATH_SEGMENT vertexFlags) SK_OVERRIDE;
+    virtual void STDMETHODCALLTYPE BeginFigure(D2D1_POINT_2F startPoint, D2D1_FIGURE_BEGIN figureBegin) SK_OVERRIDE;
+    virtual void STDMETHODCALLTYPE AddLines(const D2D1_POINT_2F *points, UINT pointsCount) SK_OVERRIDE;
+    virtual void STDMETHODCALLTYPE AddBeziers(const D2D1_BEZIER_SEGMENT *beziers, UINT beziersCount) SK_OVERRIDE;
+    virtual void STDMETHODCALLTYPE EndFigure(D2D1_FIGURE_END figureEnd) SK_OVERRIDE;
+    virtual HRESULT STDMETHODCALLTYPE Close() SK_OVERRIDE;
+
+    static HRESULT Create(SkPath* path, IDWriteGeometrySink** geometryToPath);
+};
+
+#endif