gfx/2d/ScaledFontBase.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "ScaledFontBase.h"
   8
   9 #include "PathSkia.h"
  10 #include "skia/include/core/SkFont.h"
  11
  12 #ifdef USE_CAIRO
  13 #  include "PathCairo.h"
  14 #  include "DrawTargetCairo.h"
  15 #  include "HelpersCairo.h"
  16 #endif
  17
  18 #include <vector>
  19 #include <cmath>
  20
  21 namespace mozilla {
  22 namespace gfx {
  23
  24 Atomic<uint32_t> UnscaledFont::sDeletionCounter(0);
  25
  26 UnscaledFont::~UnscaledFont() { sDeletionCounter++; }
  27
  28 Atomic<uint32_t> ScaledFont::sDeletionCounter(0);
  29
  30 ScaledFont::~ScaledFont() { sDeletionCounter++; }
  31
  32 ScaledFontBase::~ScaledFontBase() {
  33   SkSafeUnref<SkTypeface>(mTypeface);
  34   cairo_scaled_font_destroy(mScaledFont);
  35 }
  36
  37 ScaledFontBase::ScaledFontBase(const RefPtr<UnscaledFont>& aUnscaledFont,
  38                                Float aSize)
  39     : ScaledFont(aUnscaledFont),
  40       mTypeface(nullptr),
  41       mScaledFont(nullptr),
  42       mSize(aSize) {}
  43
  44 SkTypeface* ScaledFontBase::GetSkTypeface() {
  45   if (!mTypeface) {
  46     SkTypeface* typeface = CreateSkTypeface();
  47     if (!mTypeface.compareExchange(nullptr, typeface)) {
  48       SkSafeUnref(typeface);
  49     }
  50   }
  51   return mTypeface;
  52 }
  53
  54 cairo_scaled_font_t* ScaledFontBase::GetCairoScaledFont() {
  55   if (mScaledFont) {
  56     return mScaledFont;
  57   }
  58
  59   cairo_font_options_t* fontOptions = cairo_font_options_create();
  60   cairo_font_face_t* fontFace = CreateCairoFontFace(fontOptions);
  61   if (!fontFace) {
  62     cairo_font_options_destroy(fontOptions);
  63     return nullptr;
  64   }
  65
  66   cairo_matrix_t sizeMatrix;
  67   cairo_matrix_t identityMatrix;
  68
  69   cairo_matrix_init_scale(&sizeMatrix, mSize, mSize);
  70   cairo_matrix_init_identity(&identityMatrix);
  71
  72   cairo_scaled_font_t* scaledFont = cairo_scaled_font_create(
  73       fontFace, &sizeMatrix, &identityMatrix, fontOptions);
  74
  75   cairo_font_options_destroy(fontOptions);
  76   cairo_font_face_destroy(fontFace);
  77
  78   if (cairo_scaled_font_status(scaledFont) != CAIRO_STATUS_SUCCESS) {
  79     cairo_scaled_font_destroy(scaledFont);
  80     return nullptr;
  81   }
  82
  83   PrepareCairoScaledFont(scaledFont);
  84   mScaledFont = scaledFont;
  85   return mScaledFont;
  86 }
  87
  88 SkPath ScaledFontBase::GetSkiaPathForGlyphs(const GlyphBuffer& aBuffer) {
  89   SkTypeface* typeFace = GetSkTypeface();
  90   MOZ_ASSERT(typeFace);
  91
  92   SkFont font(sk_ref_sp(typeFace), SkFloatToScalar(mSize));
  93
  94   std::vector<uint16_t> indices;
  95   indices.resize(aBuffer.mNumGlyphs);
  96   for (unsigned int i = 0; i < aBuffer.mNumGlyphs; i++) {
  97     indices[i] = aBuffer.mGlyphs[i].mIndex;
  98   }
  99
 100   struct Context {
 101     const Glyph* mGlyph;
 102     SkPath mPath;
 103   } ctx = {aBuffer.mGlyphs};
 104
 105   font.getPaths(
 106       indices.data(), indices.size(),
 107       [](const SkPath* glyphPath, const SkMatrix& scaleMatrix, void* ctxPtr) {
 108         Context& ctx = *reinterpret_cast<Context*>(ctxPtr);
 109         if (glyphPath) {
 110           SkMatrix transMatrix(scaleMatrix);
 111           transMatrix.postTranslate(SkFloatToScalar(ctx.mGlyph->mPosition.x),
 112                                     SkFloatToScalar(ctx.mGlyph->mPosition.y));
 113           ctx.mPath.addPath(*glyphPath, transMatrix);
 114         }
 115         ++ctx.mGlyph;
 116       },
 117       &ctx);
 118
 119   return ctx.mPath;
 120 }
 121
 122 already_AddRefed<Path> ScaledFontBase::GetPathForGlyphs(
 123     const GlyphBuffer& aBuffer, const DrawTarget* aTarget) {
 124   if (aTarget->GetBackendType() == BackendType::SKIA) {
 125     SkPath path = GetSkiaPathForGlyphs(aBuffer);
 126     return MakeAndAddRef<PathSkia>(path, FillRule::FILL_WINDING);
 127   }
 128 #ifdef USE_CAIRO
 129   if (aTarget->GetBackendType() == BackendType::CAIRO) {
 130     auto* cairoScaledFont = GetCairoScaledFont();
 131     if (!cairoScaledFont) {
 132       MOZ_ASSERT_UNREACHABLE("Invalid scaled font");
 133       return nullptr;
 134     }
 135
 136     DrawTarget* dt = const_cast<DrawTarget*>(aTarget);
 137     cairo_t* ctx = static_cast<cairo_t*>(
 138         dt->GetNativeSurface(NativeSurfaceType::CAIRO_CONTEXT));
 139
 140     bool isNewContext = !ctx;
 141     if (!ctx) {
 142       ctx = cairo_create(DrawTargetCairo::GetDummySurface());
 143       cairo_matrix_t mat;
 144       GfxMatrixToCairoMatrix(aTarget->GetTransform(), mat);
 145       cairo_set_matrix(ctx, &mat);
 146     }
 147
 148     cairo_set_scaled_font(ctx, cairoScaledFont);
 149
 150     // Convert our GlyphBuffer into an array of Cairo glyphs.
 151     std::vector<cairo_glyph_t> glyphs(aBuffer.mNumGlyphs);
 152     for (uint32_t i = 0; i < aBuffer.mNumGlyphs; ++i) {
 153       glyphs[i].index = aBuffer.mGlyphs[i].mIndex;
 154       glyphs[i].x = aBuffer.mGlyphs[i].mPosition.x;
 155       glyphs[i].y = aBuffer.mGlyphs[i].mPosition.y;
 156     }
 157
 158     cairo_new_path(ctx);
 159
 160     cairo_glyph_path(ctx, &glyphs[0], aBuffer.mNumGlyphs);
 161
 162     RefPtr<PathCairo> newPath = new PathCairo(ctx);
 163     if (isNewContext) {
 164       cairo_destroy(ctx);
 165     }
 166
 167     return newPath.forget();
 168   }
 169 #endif
 170   RefPtr<PathBuilder> builder = aTarget->CreatePathBuilder();
 171   SkPath skPath = GetSkiaPathForGlyphs(aBuffer);
 172   RefPtr<Path> path = MakeAndAddRef<PathSkia>(skPath, FillRule::FILL_WINDING);
 173   path->StreamToSink(builder);
 174   return builder->Finish();
 175 }
 176
 177 void ScaledFontBase::CopyGlyphsToBuilder(const GlyphBuffer& aBuffer,
 178                                          PathBuilder* aBuilder,
 179                                          const Matrix* aTransformHint) {
 180   BackendType backendType = aBuilder->GetBackendType();
 181   if (backendType == BackendType::SKIA) {
 182     PathBuilderSkia* builder = static_cast<PathBuilderSkia*>(aBuilder);
 183     builder->AppendPath(GetSkiaPathForGlyphs(aBuffer));
 184     return;
 185   }
 186 #ifdef USE_CAIRO
 187   if (backendType == BackendType::CAIRO) {
 188     auto* cairoScaledFont = GetCairoScaledFont();
 189     if (!cairoScaledFont) {
 190       MOZ_ASSERT_UNREACHABLE("Invalid scaled font");
 191       return;
 192     }
 193
 194     PathBuilderCairo* builder = static_cast<PathBuilderCairo*>(aBuilder);
 195     cairo_t* ctx = cairo_create(DrawTargetCairo::GetDummySurface());
 196
 197     if (aTransformHint) {
 198       cairo_matrix_t mat;
 199       GfxMatrixToCairoMatrix(*aTransformHint, mat);
 200       cairo_set_matrix(ctx, &mat);
 201     }
 202
 203     // Convert our GlyphBuffer into an array of Cairo glyphs.
 204     std::vector<cairo_glyph_t> glyphs(aBuffer.mNumGlyphs);
 205     for (uint32_t i = 0; i < aBuffer.mNumGlyphs; ++i) {
 206       glyphs[i].index = aBuffer.mGlyphs[i].mIndex;
 207       glyphs[i].x = aBuffer.mGlyphs[i].mPosition.x;
 208       glyphs[i].y = aBuffer.mGlyphs[i].mPosition.y;
 209     }
 210
 211     cairo_set_scaled_font(ctx, cairoScaledFont);
 212     cairo_glyph_path(ctx, &glyphs[0], aBuffer.mNumGlyphs);
 213
 214     RefPtr<PathCairo> cairoPath = new PathCairo(ctx);
 215     cairo_destroy(ctx);
 216
 217     cairoPath->AppendPathToBuilder(builder);
 218     return;
 219   }
 220 #endif
 221   if (backendType == BackendType::RECORDING) {
 222     SkPath skPath = GetSkiaPathForGlyphs(aBuffer);
 223     RefPtr<Path> path = MakeAndAddRef<PathSkia>(skPath, FillRule::FILL_WINDING);
 224     path->StreamToSink(aBuilder);
 225     return;
 226   }
 227   MOZ_ASSERT(false, "Path not being copied");
 228 }
 229
 230 }  // namespace gfx
 231 }  // namespace mozilla