declassify SkiaTextMetrics -- they are all stateless

Bug: skia:2664
Change-Id: I127f51058a61b1113bcac399b4fb0324f2bdd19f
Reviewed-on: https://chromium-review.googlesource.com/c/1343038
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609449}

third_party/blink/renderer/platform/fonts/opentype/open_type_vertical_data.cc

@@ -304,7 +304,7 @@ void OpenTypeVerticalData::GetVerticalTranslationsForGlyphs(
       float top_side_bearing = top_side_bearing_f_unit * size_per_unit_;
 
       SkRect skiaBounds;
-      SkiaTextMetrics(font).GetSkiaBoundsForGlyph(glyph, &skiaBounds);
+      GetBoundsForGlyph(font, glyph, &skiaBounds);
       FloatRect bounds(skiaBounds);
       out_xy_array[1] = bounds.Y() - top_side_bearing;
       continue;

third_party/blink/renderer/platform/fonts/shaping/harfbuzz_face.cc

@@ -131,8 +131,7 @@ static hb_position_t HarfBuzzGetGlyphHorizontalAdvance(hb_font_t* hb_font,
       reinterpret_cast<HarfBuzzFontData*>(font_data);
   hb_position_t advance = 0;
 
-  SkiaTextMetrics(hb_font_data->font_)
-      .GetGlyphWidthForHarfBuzz(glyph, &advance);
+  GetGlyphWidthForHarfBuzz(hb_font_data->font_, glyph, &advance);
   return advance;
 }
 
@@ -146,9 +145,8 @@ static void HarfBuzzGetGlyphHorizontalAdvances(hb_font_t* font,
                                                void* user_data) {
   HarfBuzzFontData* hb_font_data =
       reinterpret_cast<HarfBuzzFontData*>(font_data);
-  SkiaTextMetrics(hb_font_data->font_)
-      .GetGlyphWidthForHarfBuzz(count, first_glyph, glyph_stride, first_advance,
-                                advance_stride);
+  GetGlyphWidthForHarfBuzz(hb_font_data->font_, count, first_glyph,
+                           glyph_stride, first_advance, advance_stride);
 }
 
 static hb_bool_t HarfBuzzGetGlyphVerticalOrigin(hb_font_t* hb_font,
@@ -168,8 +166,8 @@ static hb_bool_t HarfBuzzGetGlyphVerticalOrigin(hb_font_t* hb_font,
   Glyph the_glyph = glyph;
   vertical_data->GetVerticalTranslationsForGlyphs(hb_font_data->font_,
                                                   &the_glyph, 1, result);
-  *x = SkiaTextMetrics::SkiaScalarToHarfBuzzPosition(-result[0]);
-  *y = SkiaTextMetrics::SkiaScalarToHarfBuzzPosition(-result[1]);
+  *x = SkiaScalarToHarfBuzzPosition(-result[0]);
+  *y = SkiaScalarToHarfBuzzPosition(-result[1]);
   return true;
 }
 
@@ -182,14 +180,12 @@ static hb_position_t HarfBuzzGetGlyphVerticalAdvance(hb_font_t* hb_font,
   scoped_refptr<OpenTypeVerticalData> vertical_data =
       hb_font_data->VerticalData();
   if (!vertical_data) {
-    return SkiaTextMetrics::SkiaScalarToHarfBuzzPosition(
-        hb_font_data->height_fallback_);
+    return SkiaScalarToHarfBuzzPosition(hb_font_data->height_fallback_);
   }
 
   Glyph the_glyph = glyph;
   float advance_height = -vertical_data->AdvanceHeight(the_glyph);
-  return SkiaTextMetrics::SkiaScalarToHarfBuzzPosition(
-      SkFloatToScalar(advance_height));
+  return SkiaScalarToHarfBuzzPosition(SkFloatToScalar(advance_height));
 }
 
 static hb_position_t HarfBuzzGetGlyphHorizontalKerning(
@@ -208,8 +204,7 @@ static hb_position_t HarfBuzzGetGlyphHorizontalKerning(
   int32_t kerning_adjustments[1] = {0};
 
   if (typeface->getKerningPairAdjustments(glyphs, 2, kerning_adjustments)) {
-    return SkiaTextMetrics::SkiaScalarToHarfBuzzPosition(
-        SkIntToScalar(kerning_adjustments[0]) *
+    return SkiaScalarToHarfBuzzPosition(SkIntToScalar(kerning_adjustments[0]) *
                                         hb_font_data->SizePerUnit(*typeface));
   }
 
@@ -224,8 +219,7 @@ static hb_bool_t HarfBuzzGetGlyphExtents(hb_font_t* hb_font,
   HarfBuzzFontData* hb_font_data =
       reinterpret_cast<HarfBuzzFontData*>(font_data);
 
-  SkiaTextMetrics(hb_font_data->font_)
-      .GetGlyphExtentsForHarfBuzz(glyph, extents);
+  GetGlyphExtentsForHarfBuzz(hb_font_data->font_, glyph, extents);
   return true;
 }
 
@@ -435,8 +429,7 @@ hb_font_t* HarfBuzzFace::GetScaledFont(
   harfbuzz_font_data_->UpdateFallbackMetricsAndScale(*platform_data_,
                                                      vertical_layout);
 
-  int scale =
-      SkiaTextMetrics::SkiaScalarToHarfBuzzPosition(platform_data_->size());
+  int scale = SkiaScalarToHarfBuzzPosition(platform_data_->size());
   hb_font_set_scale(unscaled_font_, scale, scale);
   hb_font_set_ptem(unscaled_font_, platform_data_->size() / kCssPixelsPerPoint);
 

third_party/blink/renderer/platform/fonts/simple_font_data.cc

@@ -348,7 +348,7 @@ FloatRect SimpleFontData::PlatformBoundsForGlyph(Glyph glyph) const {
   static_assert(sizeof(glyph) == 2, "Glyph id should not be truncated.");
 
   SkRect bounds;
-  SkiaTextMetrics(font_).GetSkiaBoundsForGlyph(glyph, &bounds);
+  GetBoundsForGlyph(font_, glyph, &bounds);
   return FloatRect(bounds);
 }
 
@@ -360,7 +360,7 @@ void SimpleFontData::BoundsForGlyphs(const Vector<Glyph, 256>& glyphs,
     return;
 
   DCHECK_EQ(bounds->size(), glyphs.size());
-  SkiaTextMetrics(font_).GetSkiaBoundsForGlyphs(glyphs, bounds->data());
+  GetBoundsForGlyphs(font_, glyphs, bounds->data());
 }
 
 float SimpleFontData::PlatformWidthForGlyph(Glyph glyph) const {
@@ -369,7 +369,7 @@ float SimpleFontData::PlatformWidthForGlyph(Glyph glyph) const {
 
   static_assert(sizeof(glyph) == 2, "Glyph id should not be truncated.");
 
-  return SkiaTextMetrics(font_).GetSkiaWidthForGlyph(glyph);
+  return GetWidthForGlyph(font_, glyph);
 }
 
 }  // namespace blink

third_party/blink/renderer/platform/fonts/skia/skia_text_metrics.cc

@@ -8,7 +8,6 @@
 #include "third_party/blink/renderer/platform/wtf/math_extras.h"
 
 #include <SkFont.h>
-#include <SkPaint.h>
 #include <SkPath.h>
 
 namespace blink {
@@ -22,14 +21,8 @@ T* advance_by_byte_size(T* p, unsigned byte_size) {
 
 }  // namespace
 
-SkiaTextMetrics::SkiaTextMetrics(const SkPaint* paint)
-    : font_(SkFont::LEGACY_ExtractFromPaint(*paint)) {
-  CHECK(paint->getTextEncoding() == SkPaint::kGlyphID_TextEncoding);
-}
-
-SkiaTextMetrics::SkiaTextMetrics(const SkFont& font) : font_(font) {}
-
-void SkiaTextMetrics::GetGlyphWidthForHarfBuzz(hb_codepoint_t codepoint,
+void GetGlyphWidthForHarfBuzz(const SkFont& font,
+                              hb_codepoint_t codepoint,
                               hb_position_t* width) {
   DCHECK_LE(codepoint, 0xFFFFu);
   CHECK(width);
@@ -37,13 +30,14 @@ void SkiaTextMetrics::GetGlyphWidthForHarfBuzz(hb_codepoint_t codepoint,
   SkScalar sk_width;
   uint16_t glyph = codepoint;
 
-  font_.getWidths(&glyph, 1, &sk_width, nullptr);
-  if (!font_.isSubpixel())
+  font.getWidths(&glyph, 1, &sk_width, nullptr);
+  if (!font.isSubpixel())
     sk_width = SkScalarRoundToInt(sk_width);
   *width = SkiaScalarToHarfBuzzPosition(sk_width);
 }
 
-void SkiaTextMetrics::GetGlyphWidthForHarfBuzz(unsigned count,
+void GetGlyphWidthForHarfBuzz(const SkFont& font,
+                              unsigned count,
                               hb_codepoint_t* glyphs,
                               unsigned glyph_stride,
                               hb_position_t* advances,
@@ -57,9 +51,9 @@ void SkiaTextMetrics::GetGlyphWidthForHarfBuzz(unsigned count,
     glyph_array[i] = *glyphs;
   }
   Vector<SkScalar, 256> sk_width_array(count);
-  font_.getWidths(glyph_array.data(), count, sk_width_array.data(), nullptr);
+  font.getWidths(glyph_array.data(), count, sk_width_array.data(), nullptr);
 
-  if (!font_.isSubpixel()) {
+  if (!font.isSubpixel()) {
     for (unsigned i = 0; i < count; i++)
       sk_width_array[i] = SkScalarRoundToInt(sk_width_array[i]);
   }
@@ -71,7 +65,8 @@ void SkiaTextMetrics::GetGlyphWidthForHarfBuzz(unsigned count,
   }
 }
 
-void SkiaTextMetrics::GetGlyphExtentsForHarfBuzz(hb_codepoint_t codepoint,
+void GetGlyphExtentsForHarfBuzz(const SkFont& font,
+                                hb_codepoint_t codepoint,
                                 hb_glyph_extents_t* extents) {
   DCHECK_LE(codepoint, 0xFFFFu);
   CHECK(extents);
@@ -79,8 +74,8 @@ void SkiaTextMetrics::GetGlyphExtentsForHarfBuzz(hb_codepoint_t codepoint,
   SkRect sk_bounds;
   uint16_t glyph = codepoint;
 
-  font_.getWidths(&glyph, 1, nullptr, &sk_bounds);
-  if (!font_.isSubpixel()) {
+  font.getWidths(&glyph, 1, nullptr, &sk_bounds);
+  if (!font.isSubpixel()) {
     // Use roundOut() rather than round() to avoid rendering glyphs
     // outside the visual overflow rect. crbug.com/452914.
     sk_bounds.set(sk_bounds.roundOut());
@@ -94,35 +89,36 @@ void SkiaTextMetrics::GetGlyphExtentsForHarfBuzz(hb_codepoint_t codepoint,
   extents->height = SkiaScalarToHarfBuzzPosition(-sk_bounds.height());
 }
 
-void SkiaTextMetrics::GetSkiaBoundsForGlyph(Glyph glyph, SkRect* bounds) {
+void GetBoundsForGlyph(const SkFont& font, Glyph glyph, SkRect* bounds) {
 #if defined(OS_MACOSX)
   // TODO(drott): Remove this once we have better metrics bounds
   // on Mac, https://bugs.chromium.org/p/skia/issues/detail?id=5328
   SkPath path;
-  font_.getPath(glyph, &path);
+  font.getPath(glyph, &path);
   *bounds = path.getBounds();
 #else
-  font_.getWidths(&glyph, 1, nullptr, bounds);
+  font.getWidths(&glyph, 1, nullptr, bounds);
 #endif
 
-  if (!font_.isSubpixel()) {
+  if (!font.isSubpixel()) {
     SkIRect ir;
     bounds->roundOut(&ir);
     bounds->set(ir);
   }
 }
 
-void SkiaTextMetrics::GetSkiaBoundsForGlyphs(const Vector<Glyph, 256>& glyphs,
+void GetBoundsForGlyphs(const SkFont& font,
+                        const Vector<Glyph, 256>& glyphs,
                         SkRect* bounds) {
 #if defined(OS_MACOSX)
   for (unsigned i = 0; i < glyphs.size(); i++) {
-    GetSkiaBoundsForGlyph(glyphs[i], &bounds[i]);
+    GetBoundsForGlyph(font, glyphs[i], &bounds[i]);
   }
 #else
   static_assert(sizeof(Glyph) == 2, "Skia expects 2 bytes glyph id.");
-  font_.getWidths(glyphs.data(), glyphs.size(), nullptr, bounds);
+  font.getWidths(glyphs.data(), glyphs.size(), nullptr, bounds);
 
-  if (!font_.isSubpixel()) {
+  if (!font.isSubpixel()) {
     for (unsigned i = 0; i < glyphs.size(); i++) {
       SkIRect ir;
       bounds[i].roundOut(&ir);
@@ -132,17 +128,17 @@ void SkiaTextMetrics::GetSkiaBoundsForGlyphs(const Vector<Glyph, 256>& glyphs,
 #endif
 }
 
-float SkiaTextMetrics::GetSkiaWidthForGlyph(Glyph glyph) {
+float GetWidthForGlyph(const SkFont& font, Glyph glyph) {
   SkScalar sk_width;
-  font_.getWidths(&glyph, 1, &sk_width, nullptr);
+  font.getWidths(&glyph, 1, &sk_width, nullptr);
 
-  if (!font_.isSubpixel())
+  if (!font.isSubpixel())
     sk_width = SkScalarRoundToInt(sk_width);
 
   return SkScalarToFloat(sk_width);
 }
 
-hb_position_t SkiaTextMetrics::SkiaScalarToHarfBuzzPosition(SkScalar value) {
+hb_position_t SkiaScalarToHarfBuzzPosition(SkScalar value) {
   // We treat HarfBuzz hb_position_t as 16.16 fixed-point.
   static const int kHbPosition1 = 1 << 16;
   return clampTo<int>(value * kHbPosition1);

third_party/blink/renderer/platform/fonts/skia/skia_text_metrics.h

@@ -7,36 +7,32 @@
 
 #include "third_party/blink/renderer/platform/fonts/glyph.h"
 
-#include <SkFont.h>
 #include <hb.h>
 #include "third_party/blink/renderer/platform/wtf/vector.h"
+#include "third_party/skia/include/core/SkRect.h"
 
-class SkPaint;
+class SkFont;
 
 namespace blink {
 
-class SkiaTextMetrics final {
- public:
-  SkiaTextMetrics(const SkPaint* legacy_paint);
-  SkiaTextMetrics(const SkFont&);
-
-  void GetGlyphWidthForHarfBuzz(hb_codepoint_t, hb_position_t* width);
-  void GetGlyphWidthForHarfBuzz(unsigned count,
+void GetGlyphWidthForHarfBuzz(const SkFont&,
+                              hb_codepoint_t,
+                              hb_position_t* width);
+void GetGlyphWidthForHarfBuzz(const SkFont&,
+                              unsigned count,
                               hb_codepoint_t* first_glyph,
                               unsigned glyph_stride,
                               hb_position_t* first_advance,
                               unsigned advance_stride);
-  void GetGlyphExtentsForHarfBuzz(hb_codepoint_t, hb_glyph_extents_t*);
-
-  void GetSkiaBoundsForGlyph(Glyph, SkRect* bounds);
-  void GetSkiaBoundsForGlyphs(const Vector<Glyph, 256>&, SkRect*);
-  float GetSkiaWidthForGlyph(Glyph);
+void GetGlyphExtentsForHarfBuzz(const SkFont&,
+                                hb_codepoint_t,
+                                hb_glyph_extents_t*);
 
-  static hb_position_t SkiaScalarToHarfBuzzPosition(SkScalar value);
+void GetBoundsForGlyph(const SkFont&, Glyph, SkRect* bounds);
+void GetBoundsForGlyphs(const SkFont&, const Vector<Glyph, 256>&, SkRect*);
+float GetWidthForGlyph(const SkFont&, Glyph);
 
- private:
-  const SkFont font_;
-};
+hb_position_t SkiaScalarToHarfBuzzPosition(SkScalar value);
 
 }  // namespace blink