tor-browser

ScaledFontBase.cpp (7014B)

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "ScaledFontBase.h"

#include "PathSkia.h"
#include "skia/include/core/SkFont.h"

#ifdef USE_CAIRO
#  include "PathCairo.h"
#  include "DrawTargetCairo.h"
#  include "HelpersCairo.h"
#endif

#include <vector>
#include <cmath>

namespace mozilla {
namespace gfx {

Atomic<uint32_t> UnscaledFont::sDeletionCounter(0);

UnscaledFont::~UnscaledFont() { sDeletionCounter++; }

Atomic<uint32_t> ScaledFont::sDeletionCounter(0);

ScaledFont::~ScaledFont() { sDeletionCounter++; }

ScaledFontBase::~ScaledFontBase() {
 SkSafeUnref<SkTypeface>(mTypeface);
 cairo_scaled_font_destroy(mScaledFont);
}

ScaledFontBase::ScaledFontBase(const RefPtr<UnscaledFont>& aUnscaledFont,
                              Float aSize)
   : ScaledFont(aUnscaledFont),
     mTypeface(nullptr),
     mScaledFont(nullptr),
     mSize(aSize) {}

SkTypeface* ScaledFontBase::GetSkTypeface() {
 if (!mTypeface) {
   SkTypeface* typeface = CreateSkTypeface();
   if (!mTypeface.compareExchange(nullptr, typeface)) {
     SkSafeUnref(typeface);
   }
 }
 return mTypeface;
}

cairo_scaled_font_t* ScaledFontBase::GetCairoScaledFont() {
 if (mScaledFont) {
   return mScaledFont;
 }

 cairo_font_options_t* fontOptions = cairo_font_options_create();
 cairo_font_face_t* fontFace = CreateCairoFontFace(fontOptions);
 if (!fontFace) {
   cairo_font_options_destroy(fontOptions);
   return nullptr;
 }

 cairo_matrix_t sizeMatrix;
 cairo_matrix_t identityMatrix;

 cairo_matrix_init_scale(&sizeMatrix, mSize, mSize);
 cairo_matrix_init_identity(&identityMatrix);

 cairo_scaled_font_t* scaledFont = cairo_scaled_font_create(
     fontFace, &sizeMatrix, &identityMatrix, fontOptions);

 cairo_font_options_destroy(fontOptions);
 cairo_font_face_destroy(fontFace);

 if (cairo_scaled_font_status(scaledFont) != CAIRO_STATUS_SUCCESS) {
   cairo_scaled_font_destroy(scaledFont);
   return nullptr;
 }

 PrepareCairoScaledFont(scaledFont);
 mScaledFont = scaledFont;
 return mScaledFont;
}

SkPath ScaledFontBase::GetSkiaPathForGlyphs(const GlyphBuffer& aBuffer) {
 SkTypeface* typeFace = GetSkTypeface();
 MOZ_ASSERT(typeFace);

 SkFont font(sk_ref_sp(typeFace), SkFloatToScalar(mSize));

 std::vector<uint16_t> indices;
 indices.resize(aBuffer.mNumGlyphs);
 for (unsigned int i = 0; i < aBuffer.mNumGlyphs; i++) {
   indices[i] = aBuffer.mGlyphs[i].mIndex;
 }

 struct Context {
   const Glyph* mGlyph;
   SkPath mPath;
 } ctx = {aBuffer.mGlyphs};

 font.getPaths(
     {indices.data(), indices.size()},
     [](const SkPath* glyphPath, const SkMatrix& scaleMatrix, void* ctxPtr) {
       Context& ctx = *reinterpret_cast<Context*>(ctxPtr);
       if (glyphPath) {
         SkMatrix transMatrix(scaleMatrix);
         transMatrix.postTranslate(SkFloatToScalar(ctx.mGlyph->mPosition.x),
                                   SkFloatToScalar(ctx.mGlyph->mPosition.y));
         ctx.mPath.addPath(*glyphPath, transMatrix);
       }
       ++ctx.mGlyph;
     },
     &ctx);

 return ctx.mPath;
}

already_AddRefed<Path> ScaledFontBase::GetPathForGlyphs(
   const GlyphBuffer& aBuffer, const DrawTarget* aTarget) {
 if (aTarget->GetBackendType() == BackendType::SKIA) {
   SkPath path = GetSkiaPathForGlyphs(aBuffer);
   return MakeAndAddRef<PathSkia>(path, FillRule::FILL_WINDING);
 }
#ifdef USE_CAIRO
 if (aTarget->GetBackendType() == BackendType::CAIRO) {
   auto* cairoScaledFont = GetCairoScaledFont();
   if (!cairoScaledFont) {
     MOZ_ASSERT_UNREACHABLE("Invalid scaled font");
     return nullptr;
   }

   DrawTarget* dt = const_cast<DrawTarget*>(aTarget);
   cairo_t* ctx = static_cast<cairo_t*>(
       dt->GetNativeSurface(NativeSurfaceType::CAIRO_CONTEXT));

   bool isNewContext = !ctx;
   if (!ctx) {
     ctx = cairo_create(DrawTargetCairo::GetDummySurface());
     cairo_matrix_t mat;
     GfxMatrixToCairoMatrix(aTarget->GetTransform(), mat);
     cairo_set_matrix(ctx, &mat);
   }

   cairo_set_scaled_font(ctx, cairoScaledFont);

   // Convert our GlyphBuffer into an array of Cairo glyphs.
   std::vector<cairo_glyph_t> glyphs(aBuffer.mNumGlyphs);
   for (uint32_t i = 0; i < aBuffer.mNumGlyphs; ++i) {
     glyphs[i].index = aBuffer.mGlyphs[i].mIndex;
     glyphs[i].x = aBuffer.mGlyphs[i].mPosition.x;
     glyphs[i].y = aBuffer.mGlyphs[i].mPosition.y;
   }

   cairo_new_path(ctx);

   cairo_glyph_path(ctx, &glyphs[0], aBuffer.mNumGlyphs);

   RefPtr<PathCairo> newPath = new PathCairo(ctx);
   if (isNewContext) {
     cairo_destroy(ctx);
   }

   return newPath.forget();
 }
#endif
 RefPtr<PathBuilder> builder = aTarget->CreatePathBuilder();
 SkPath skPath = GetSkiaPathForGlyphs(aBuffer);
 RefPtr<Path> path = MakeAndAddRef<PathSkia>(skPath, FillRule::FILL_WINDING);
 path->StreamToSink(builder);
 return builder->Finish();
}

void ScaledFontBase::CopyGlyphsToBuilder(const GlyphBuffer& aBuffer,
                                        PathBuilder* aBuilder,
                                        const Matrix* aTransformHint) {
 BackendType backendType = aBuilder->GetBackendType();
 if (backendType == BackendType::SKIA) {
   PathBuilderSkia* builder = static_cast<PathBuilderSkia*>(aBuilder);
   builder->AppendPath(GetSkiaPathForGlyphs(aBuffer));
   return;
 }
#ifdef USE_CAIRO
 if (backendType == BackendType::CAIRO) {
   auto* cairoScaledFont = GetCairoScaledFont();
   if (!cairoScaledFont) {
     MOZ_ASSERT_UNREACHABLE("Invalid scaled font");
     return;
   }

   PathBuilderCairo* builder = static_cast<PathBuilderCairo*>(aBuilder);
   cairo_t* ctx = cairo_create(DrawTargetCairo::GetDummySurface());

   if (aTransformHint) {
     cairo_matrix_t mat;
     GfxMatrixToCairoMatrix(*aTransformHint, mat);
     cairo_set_matrix(ctx, &mat);
   }

   // Convert our GlyphBuffer into an array of Cairo glyphs.
   std::vector<cairo_glyph_t> glyphs(aBuffer.mNumGlyphs);
   for (uint32_t i = 0; i < aBuffer.mNumGlyphs; ++i) {
     glyphs[i].index = aBuffer.mGlyphs[i].mIndex;
     glyphs[i].x = aBuffer.mGlyphs[i].mPosition.x;
     glyphs[i].y = aBuffer.mGlyphs[i].mPosition.y;
   }

   cairo_set_scaled_font(ctx, cairoScaledFont);
   cairo_glyph_path(ctx, &glyphs[0], aBuffer.mNumGlyphs);

   RefPtr<PathCairo> cairoPath = new PathCairo(ctx);
   cairo_destroy(ctx);

   cairoPath->AppendPathToBuilder(builder);
   return;
 }
#endif
 if (backendType == BackendType::RECORDING) {
   SkPath skPath = GetSkiaPathForGlyphs(aBuffer);
   RefPtr<Path> path = MakeAndAddRef<PathSkia>(skPath, FillRule::FILL_WINDING);
   path->StreamToSink(aBuilder);
   return;
 }
 MOZ_ASSERT(false, "Path not being copied");
}

}  // namespace gfx
}  // namespace mozilla