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 |