1 files changed, 293 insertions, 0 deletions
diff --git a/gfx/2d/ScaledFontDWrite.cpp b/gfx/2d/ScaledFontDWrite.cpp
new file mode 100644
index 0000000000..dc8e586f56
--- /dev/null
+++ b/gfx/2d/ScaledFontDWrite.cpp
@@ -0,0 +1,293 @@
+/* -*- 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 "DrawTargetD2D1.h"
+#include "ScaledFontDWrite.h"
+#include "PathD2D.h"
+#include "gfxFont.h"
+
+using namespace std;
+
+#ifdef USE_SKIA
+#include "PathSkia.h"
+#include "skia/include/core/SkPaint.h"
+#include "skia/include/core/SkPath.h"
+#include "skia/include/ports/SkTypeface_win.h"
+#endif
+
+#include <vector>
+
+#ifdef USE_CAIRO_SCALED_FONT
+#include "cairo-win32.h"
+#endif
+
+#include "HelpersWinFonts.h"
+
+namespace mozilla {
+namespace gfx {
+
+#define GASP_TAG 0x70736167
+#define GASP_DOGRAY 0x2
+
+static inline unsigned short
+readShort(const char *aBuf)
+{
+  return (*aBuf << 8) | *(aBuf + 1);
+}
+
+static bool
+DoGrayscale(IDWriteFontFace *aDWFace, Float ppem)
+{
+  void *tableContext;
+  char *tableData;
+  UINT32 tableSize;
+  BOOL exists;
+  aDWFace->TryGetFontTable(GASP_TAG, (const void**)&tableData, &tableSize, &tableContext, &exists);
+
+  if (exists) {
+    if (tableSize < 4) {
+      aDWFace->ReleaseFontTable(tableContext);
+      return true;
+    }
+    struct gaspRange {
+      unsigned short maxPPEM; // Stored big-endian
+      unsigned short behavior; // Stored big-endian
+    };
+    unsigned short numRanges = readShort(tableData + 2);
+    if (tableSize < (UINT)4 + numRanges * 4) {
+      aDWFace->ReleaseFontTable(tableContext);
+      return true;
+    }
+    gaspRange *ranges = (gaspRange *)(tableData + 4);
+    for (int i = 0; i < numRanges; i++) {
+      if (readShort((char*)&ranges[i].maxPPEM) > ppem) {
+        if (!(readShort((char*)&ranges[i].behavior) & GASP_DOGRAY)) {
+          aDWFace->ReleaseFontTable(tableContext);
+          return false;
+        }
+        break;
+      }
+    }
+    aDWFace->ReleaseFontTable(tableContext);
+  }
+  return true;
+}
+
+static inline DWRITE_FONT_STRETCH
+DWriteFontStretchFromStretch(int16_t aStretch)
+{
+    switch (aStretch) {
+        case NS_FONT_STRETCH_ULTRA_CONDENSED:
+            return DWRITE_FONT_STRETCH_ULTRA_CONDENSED;
+        case NS_FONT_STRETCH_EXTRA_CONDENSED:
+            return DWRITE_FONT_STRETCH_EXTRA_CONDENSED;
+        case NS_FONT_STRETCH_CONDENSED:
+            return DWRITE_FONT_STRETCH_CONDENSED;
+        case NS_FONT_STRETCH_SEMI_CONDENSED:
+            return DWRITE_FONT_STRETCH_SEMI_CONDENSED;
+        case NS_FONT_STRETCH_NORMAL:
+            return DWRITE_FONT_STRETCH_NORMAL;
+        case NS_FONT_STRETCH_SEMI_EXPANDED:
+            return DWRITE_FONT_STRETCH_SEMI_EXPANDED;
+        case NS_FONT_STRETCH_EXPANDED:
+            return DWRITE_FONT_STRETCH_EXPANDED;
+        case NS_FONT_STRETCH_EXTRA_EXPANDED:
+            return DWRITE_FONT_STRETCH_EXTRA_EXPANDED;
+        case NS_FONT_STRETCH_ULTRA_EXPANDED:
+            return DWRITE_FONT_STRETCH_ULTRA_EXPANDED;
+        default:
+            return DWRITE_FONT_STRETCH_UNDEFINED;
+    }
+}
+
+ScaledFontDWrite::ScaledFontDWrite(IDWriteFontFace *aFontFace, Float aSize,
+                                   bool aUseEmbeddedBitmap, bool aForceGDIMode,
+                                   const gfxFontStyle* aStyle)
+    : ScaledFontBase(aSize)
+    , mFontFace(aFontFace)
+    , mUseEmbeddedBitmap(aUseEmbeddedBitmap)
+    , mForceGDIMode(aForceGDIMode)
+{
+  mStyle = SkFontStyle(aStyle->weight,
+                       DWriteFontStretchFromStretch(aStyle->stretch),
+                       aStyle->style == NS_FONT_STYLE_NORMAL ?
+                       SkFontStyle::kUpright_Slant : SkFontStyle::kItalic_Slant);
+}
+
+already_AddRefed<Path>
+ScaledFontDWrite::GetPathForGlyphs(const GlyphBuffer &aBuffer, const DrawTarget *aTarget)
+{
+  if (aTarget->GetBackendType() != BackendType::DIRECT2D && aTarget->GetBackendType() != BackendType::DIRECT2D1_1) {
+    return ScaledFontBase::GetPathForGlyphs(aBuffer, aTarget);
+  }
+
+  RefPtr<PathBuilder> pathBuilder = aTarget->CreatePathBuilder();
+
+  PathBuilderD2D *pathBuilderD2D =
+    static_cast<PathBuilderD2D*>(pathBuilder.get());
+
+  CopyGlyphsToSink(aBuffer, pathBuilderD2D->GetSink());
+
+  return pathBuilder->Finish();
+}
+
+
+#ifdef USE_SKIA
+SkTypeface*
+ScaledFontDWrite::GetSkTypeface()
+{
+  if (!mTypeface) {
+    IDWriteFactory *factory = DrawTargetD2D1::GetDWriteFactory();
+    if (!factory) {
+      return nullptr;
+    }
+
+    mTypeface = SkCreateTypefaceFromDWriteFont(factory, mFontFace, mStyle, mForceGDIMode);
+  }
+  return mTypeface;
+}
+#endif
+
+void
+ScaledFontDWrite::CopyGlyphsToBuilder(const GlyphBuffer &aBuffer, PathBuilder *aBuilder, const Matrix *aTransformHint)
+{
+  BackendType backendType = aBuilder->GetBackendType();
+  if (backendType != BackendType::DIRECT2D && backendType != BackendType::DIRECT2D1_1) {
+    ScaledFontBase::CopyGlyphsToBuilder(aBuffer, aBuilder, aTransformHint);
+    return;
+  }
+
+  PathBuilderD2D *pathBuilderD2D =
+    static_cast<PathBuilderD2D*>(aBuilder);
+
+  if (pathBuilderD2D->IsFigureActive()) {
+    gfxCriticalNote << "Attempting to copy glyphs to PathBuilderD2D with active figure.";
+  }
+
+  CopyGlyphsToSink(aBuffer, pathBuilderD2D->GetSink());
+}
+
+void
+ScaledFontDWrite::GetGlyphDesignMetrics(const uint16_t* aGlyphs, uint32_t aNumGlyphs, GlyphMetrics* aGlyphMetrics)
+{
+  DWRITE_FONT_METRICS fontMetrics;
+  mFontFace->GetMetrics(&fontMetrics);
+
+  vector<DWRITE_GLYPH_METRICS> metrics(aNumGlyphs);
+  mFontFace->GetDesignGlyphMetrics(aGlyphs, aNumGlyphs, &metrics.front());
+
+  Float designUnitCorrection = 1.f / fontMetrics.designUnitsPerEm;
+
+  for (uint32_t i = 0; i < aNumGlyphs; i++) {
+    aGlyphMetrics[i].mXBearing = metrics[i].leftSideBearing * designUnitCorrection * mSize;
+    aGlyphMetrics[i].mXAdvance = metrics[i].advanceWidth * designUnitCorrection * mSize;
+    aGlyphMetrics[i].mYBearing = metrics[i].topSideBearing * designUnitCorrection * mSize;
+    aGlyphMetrics[i].mYAdvance = metrics[i].advanceHeight * designUnitCorrection * mSize;
+    aGlyphMetrics[i].mWidth = (metrics[i].advanceHeight - metrics[i].topSideBearing - metrics[i].bottomSideBearing) *
+                              designUnitCorrection * mSize;
+    aGlyphMetrics[i].mHeight = (metrics[i].topSideBearing - metrics[i].verticalOriginY) * designUnitCorrection * mSize;
+  }
+}
+
+void
+ScaledFontDWrite::CopyGlyphsToSink(const GlyphBuffer &aBuffer, ID2D1GeometrySink *aSink)
+{
+  std::vector<UINT16> indices;
+  std::vector<FLOAT> advances;
+  std::vector<DWRITE_GLYPH_OFFSET> offsets;
+  indices.resize(aBuffer.mNumGlyphs);
+  advances.resize(aBuffer.mNumGlyphs);
+  offsets.resize(aBuffer.mNumGlyphs);
+
+  memset(&advances.front(), 0, sizeof(FLOAT) * aBuffer.mNumGlyphs);
+  for (unsigned int i = 0; i < aBuffer.mNumGlyphs; i++) {
+    indices[i] = aBuffer.mGlyphs[i].mIndex;
+    offsets[i].advanceOffset = aBuffer.mGlyphs[i].mPosition.x;
+    offsets[i].ascenderOffset = -aBuffer.mGlyphs[i].mPosition.y;
+  }
+
+  HRESULT hr =
+    mFontFace->GetGlyphRunOutline(mSize, &indices.front(), &advances.front(),
+                                  &offsets.front(), aBuffer.mNumGlyphs,
+                                  FALSE, FALSE, aSink);
+  if (FAILED(hr)) {
+    gfxCriticalNote << "Failed to copy glyphs to geometry sink. Code: " << hexa(hr);
+  }
+}
+
+bool
+ScaledFontDWrite::GetFontFileData(FontFileDataOutput aDataCallback, void *aBaton)
+{
+  UINT32 fileCount = 0;
+  mFontFace->GetFiles(&fileCount, nullptr);
+
+  if (fileCount > 1) {
+    MOZ_ASSERT(false);
+    return false;
+  }
+
+  RefPtr<IDWriteFontFile> file;
+  mFontFace->GetFiles(&fileCount, getter_AddRefs(file));
+
+  const void *referenceKey;
+  UINT32 refKeySize;
+  // XXX - This can currently crash for webfonts, as when we get the reference
+  // key out of the file, that can be an invalid reference key for the loader
+  // we use it with. The fix to this is not obvious but it will probably 
+  // have to happen inside thebes.
+  file->GetReferenceKey(&referenceKey, &refKeySize);
+
+  RefPtr<IDWriteFontFileLoader> loader;
+  file->GetLoader(getter_AddRefs(loader));
+  
+  RefPtr<IDWriteFontFileStream> stream;
+  loader->CreateStreamFromKey(referenceKey, refKeySize, getter_AddRefs(stream));
+
+  UINT64 fileSize64;
+  stream->GetFileSize(&fileSize64);
+  if (fileSize64 > UINT32_MAX) {
+    MOZ_ASSERT(false);
+    return false;
+  }
+  
+  uint32_t fileSize = static_cast<uint32_t>(fileSize64);
+  const void *fragmentStart;
+  void *context;
+  stream->ReadFileFragment(&fragmentStart, 0, fileSize, &context);
+
+  aDataCallback((uint8_t*)fragmentStart, fileSize, mFontFace->GetIndex(), mSize, aBaton);
+
+  stream->ReleaseFileFragment(context);
+
+  return true;
+}
+
+AntialiasMode
+ScaledFontDWrite::GetDefaultAAMode()
+{
+  AntialiasMode defaultMode = GetSystemDefaultAAMode();
+
+  if (defaultMode == AntialiasMode::GRAY) {
+    if (!DoGrayscale(mFontFace, mSize)) {
+      defaultMode = AntialiasMode::NONE;
+    }
+  }
+  return defaultMode;
+}
+
+#ifdef USE_CAIRO_SCALED_FONT
+cairo_font_face_t*
+ScaledFontDWrite::GetCairoFontFace()
+{
+  if (!mFontFace) {
+    return nullptr;
+  }
+
+  return cairo_dwrite_font_face_create_for_dwrite_fontface(nullptr, mFontFace);
+}
+#endif
+
+}
+}