Remove HarfBuzzFaceCoreText

Source/platform/fonts/harfbuzz/HarfBuzzFace.cpp

Index: Source/platform/fonts/harfbuzz/HarfBuzzFace.cpp
diff --git a/Source/platform/fonts/harfbuzz/HarfBuzzFace.cpp b/Source/platform/fonts/harfbuzz/HarfBuzzFace.cpp
index 64158c0b20e013e7ab887f223e240dc50224edf4..11afea385a0473f04b8a8d45e59aa2843c99fab8 100644
--- a/Source/platform/fonts/harfbuzz/HarfBuzzFace.cpp
+++ b/Source/platform/fonts/harfbuzz/HarfBuzzFace.cpp
@@ -31,9 +31,21 @@
 #include "config.h"
 #include "platform/fonts/harfbuzz/HarfBuzzFace.h"
 
-#include "platform/fonts/FontPlatformData.h"
 #include "hb-ot.h"
 #include "hb.h"
+#if OS(MACOSX)
+#include "hb-coretext.h"
+#endif
+#include "SkPaint.h"
+#include "SkPath.h"
+#include "SkPoint.h"
+#include "SkRect.h"
+#include "SkTypeface.h"
+#include "SkUtils.h"
+#include "platform/fonts/FontPlatformData.h"
+#include "platform/fonts/SimpleFontData.h"
+#include "platform/fonts/harfbuzz/HarfBuzzShaper.h"
+#include "wtf/HashMap.h"
 
 namespace blink {
 
@@ -128,4 +140,177 @@ void HarfBuzzFace::setScriptForVerticalGlyphSubstitution(hb_buffer_t* buffer)
     hb_buffer_set_script(buffer, m_scriptForVerticalText);
 }
 
+struct HarfBuzzFontData {
+    HarfBuzzFontData(WTF::HashMap<uint32_t, uint16_t>* glyphCacheForFaceCacheEntry)
+        : m_glyphCacheForFaceCacheEntry(glyphCacheForFaceCacheEntry)
+    { }
+    SkPaint m_paint;
+    WTF::HashMap<uint32_t, uint16_t>* m_glyphCacheForFaceCacheEntry;
+};
+
+static hb_position_t SkiaScalarToHarfBuzzPosition(SkScalar value)
+{
+    return SkScalarToFixed(value);
+}
+
+static void SkiaGetGlyphWidthAndExtents(SkPaint* paint, hb_codepoint_t codepoint, hb_position_t* width, hb_glyph_extents_t* extents)
+{
+    ASSERT(codepoint <= 0xFFFF);
+    paint->setTextEncoding(SkPaint::kGlyphID_TextEncoding);
+
+    SkScalar skWidth;
+    SkRect skBounds;
+    uint16_t glyph = codepoint;
+
+    paint->getTextWidths(&glyph, sizeof(glyph), &skWidth, &skBounds);
+    if (width)
+        *width = SkiaScalarToHarfBuzzPosition(skWidth);
+    if (extents) {
+        // Invert y-axis because Skia is y-grows-down but we set up HarfBuzz to be y-grows-up.
+        extents->x_bearing = SkiaScalarToHarfBuzzPosition(skBounds.fLeft);
+        extents->y_bearing = SkiaScalarToHarfBuzzPosition(-skBounds.fTop);
+        extents->width = SkiaScalarToHarfBuzzPosition(skBounds.width());
+        extents->height = SkiaScalarToHarfBuzzPosition(-skBounds.height());
+    }
+}
+
+static hb_bool_t harfBuzzGetGlyph(hb_font_t* hbFont, void* fontData, hb_codepoint_t unicode, hb_codepoint_t variationSelector, hb_codepoint_t* glyph, void* userData)
+{
+    // Variation selectors not supported.
+    if (variationSelector)
+        return false;
+
+    HarfBuzzFontData* hbFontData = reinterpret_cast<HarfBuzzFontData*>(fontData);
+
+    WTF::HashMap<uint32_t, uint16_t>::AddResult result = hbFontData->m_glyphCacheForFaceCacheEntry->add(unicode, 0);
+    if (result.isNewEntry) {
+        SkPaint* paint = &hbFontData->m_paint;
+        paint->setTextEncoding(SkPaint::kUTF32_TextEncoding);
+        uint16_t glyph16;
+        paint->textToGlyphs(&unicode, sizeof(hb_codepoint_t), &glyph16);
+        result.storedValue->value = glyph16;
+        *glyph = glyph16;
+    }
+    *glyph = result.storedValue->value;
+    return !!*glyph;
+}
+
+static hb_position_t harfBuzzGetGlyphHorizontalAdvance(hb_font_t* hbFont, void* fontData, hb_codepoint_t glyph, void* userData)
+{
+    HarfBuzzFontData* hbFontData = reinterpret_cast<HarfBuzzFontData*>(fontData);
+    hb_position_t advance = 0;
+
+    SkiaGetGlyphWidthAndExtents(&hbFontData->m_paint, glyph, &advance, 0);
+    return advance;
+}
+
+static hb_bool_t harfBuzzGetGlyphHorizontalOrigin(hb_font_t* hbFont, void* fontData, hb_codepoint_t glyph, hb_position_t* x, hb_position_t* y, void* userData)
+{
+    // Just return true, following the way that HarfBuzz-FreeType
+    // implementation does.
+    return true;
+}
+
+static hb_position_t harfBuzzGetGlyphHorizontalKerning(hb_font_t*, void* fontData, hb_codepoint_t leftGlyph, hb_codepoint_t rightGlyph, void*)
+{
+    HarfBuzzFontData* hbFontData = reinterpret_cast<HarfBuzzFontData*>(fontData);
+    if (hbFontData->m_paint.isVerticalText()) {
+        // We don't support cross-stream kerning
+        return 0;
+    }
+
+    SkTypeface* typeface = hbFontData->m_paint.getTypeface();
+
+    const uint16_t glyphs[2] = { static_cast<uint16_t>(leftGlyph), static_cast<uint16_t>(rightGlyph) };
+    int32_t kerningAdjustments[1] = { 0 };
+
+    if (typeface->getKerningPairAdjustments(glyphs, 2, kerningAdjustments)) {
+        SkScalar upm = SkIntToScalar(typeface->getUnitsPerEm());
+        SkScalar size = hbFontData->m_paint.getTextSize();
+        return SkiaScalarToHarfBuzzPosition(SkScalarMulDiv(SkIntToScalar(kerningAdjustments[0]), size, upm));
+    }
+
+    return 0;
+}
+
+
+static hb_bool_t harfBuzzGetGlyphExtents(hb_font_t* hbFont, void* fontData, hb_codepoint_t glyph, hb_glyph_extents_t* extents, void* userData)
+{
+    HarfBuzzFontData* hbFontData = reinterpret_cast<HarfBuzzFontData*>(fontData);
+
+    SkiaGetGlyphWidthAndExtents(&hbFontData->m_paint, glyph, 0, extents);
+    return true;
+}
+
+static hb_font_funcs_t* harfBuzzSkiaGetFontFuncs()
+{
+    static hb_font_funcs_t* harfBuzzSkiaFontFuncs = 0;
+
+    // We don't set callback functions which we can't support.
+    // HarfBuzz will use the fallback implementation if they aren't set.
+    if (!harfBuzzSkiaFontFuncs) {
+        harfBuzzSkiaFontFuncs = hb_font_funcs_create();
+        hb_font_funcs_set_glyph_func(harfBuzzSkiaFontFuncs, harfBuzzGetGlyph, 0, 0);
+        hb_font_funcs_set_glyph_h_advance_func(harfBuzzSkiaFontFuncs, harfBuzzGetGlyphHorizontalAdvance, 0, 0);
+        hb_font_funcs_set_glyph_h_kerning_func(harfBuzzSkiaFontFuncs, harfBuzzGetGlyphHorizontalKerning, 0, 0);
+        hb_font_funcs_set_glyph_h_origin_func(harfBuzzSkiaFontFuncs, harfBuzzGetGlyphHorizontalOrigin, 0, 0);
+        hb_font_funcs_set_glyph_extents_func(harfBuzzSkiaFontFuncs, harfBuzzGetGlyphExtents, 0, 0);
+        hb_font_funcs_make_immutable(harfBuzzSkiaFontFuncs);
+    }
+    return harfBuzzSkiaFontFuncs;
+}
+
+#if !OS(MACOSX)
+static hb_blob_t* harfBuzzSkiaGetTable(hb_face_t* face, hb_tag_t tag, void* userData)
+{
+    SkTypeface* typeface = reinterpret_cast<SkTypeface*>(userData);
+
+    const size_t tableSize = typeface->getTableSize(tag);
+    if (!tableSize) {
+        return 0;
+    }
+
+    char* buffer = reinterpret_cast<char*>(fastMalloc(tableSize));
+    if (!buffer)
+        return 0;
+    size_t actualSize = typeface->getTableData(tag, 0, tableSize, buffer);
+    if (tableSize != actualSize) {
+        fastFree(buffer);
+        return 0;
+    }
+
+    return hb_blob_create(const_cast<char*>(buffer), tableSize, HB_MEMORY_MODE_WRITABLE, buffer, fastFree);
+}
+#endif
+
+static void destroyHarfBuzzFontData(void* userData)
+{
+    HarfBuzzFontData* hbFontData = reinterpret_cast<HarfBuzzFontData*>(userData);
+    delete hbFontData;
+}
+
+hb_face_t* HarfBuzzFace::createFace()
+{
+#if OS(MACOSX)
+    hb_face_t* face = hb_coretext_face_create(m_platformData->cgFont());
+#else
+    hb_face_t* face = hb_face_create_for_tables(harfBuzzSkiaGetTable, m_platformData->typeface(), 0);
+#endif
+    ASSERT(face);
+    return face;
+}
+
+hb_font_t* HarfBuzzFace::createFont()
+{
+    HarfBuzzFontData* hbFontData = new HarfBuzzFontData(m_glyphCacheForFaceCacheEntry);
+    m_platformData->setupPaint(&hbFontData->m_paint);
+    hb_font_t* font = hb_font_create(m_face);
+    hb_font_set_funcs(font, harfBuzzSkiaGetFontFuncs(), hbFontData, destroyHarfBuzzFontData);
+    float size = m_platformData->size();
+    int scale = SkiaScalarToHarfBuzzPosition(size);
+    hb_font_set_scale(font, scale, scale);
+    hb_font_make_immutable(font);
+    return font;
+}
+
 } // namespace blink