move Sk{Test,Random}ScalerContext to tools

There's no need for Skia users to link this test code.

Change-Id: I9d6ef2a053d0cf5cb916aa254389ca819c48bae1
Reviewed-on: https://skia-review.googlesource.com/69922
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>

4 files changed, 711 insertions, 0 deletions

diff --git a/tools/SkRandomScalerContext.cpp b/tools/SkRandomScalerContext.cpp
new file mode 100644
index 0000000000..49d9ab43ff
--- /dev/null
+++ b/tools/SkRandomScalerContext.cpp
@@ -0,0 +1,258 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkAdvancedTypefaceMetrics.h"
+#include "SkBitmap.h"
+#include "SkCanvas.h"
+#include "SkGlyph.h"
+#include "SkMakeUnique.h"
+#include "SkPath.h"
+#include "SkRandomScalerContext.h"
+#include "SkRasterizer.h"
+
+class SkDescriptor;
+
+class SkRandomScalerContext : public SkScalerContext {
+public:
+    SkRandomScalerContext(sk_sp<SkRandomTypeface>, const SkScalerContextEffects&,
+                          const SkDescriptor*, bool fFakeIt);
+
+protected:
+    unsigned generateGlyphCount() override;
+    uint16_t generateCharToGlyph(SkUnichar) override;
+    void generateAdvance(SkGlyph*) override;
+    void generateMetrics(SkGlyph*) override;
+    void generateImage(const SkGlyph&) override;
+    void generatePath(SkGlyphID, SkPath*) override;
+    void generateFontMetrics(SkPaint::FontMetrics*) override;
+
+private:
+    SkRandomTypeface* getRandomTypeface() const {
+        return static_cast<SkRandomTypeface*>(this->getTypeface());
+    }
+    std::unique_ptr<SkScalerContext> fProxy;
+    bool fFakeIt;
+};
+
+SkRandomScalerContext::SkRandomScalerContext(sk_sp<SkRandomTypeface> face,
+                                             const SkScalerContextEffects& effects,
+                                             const SkDescriptor* desc,
+                                             bool fakeIt)
+        : SkScalerContext(std::move(face), effects, desc)
+        , fFakeIt(fakeIt) {
+    fProxy = this->getRandomTypeface()->proxy()->createScalerContext(effects, desc);
+}
+
+unsigned SkRandomScalerContext::generateGlyphCount() {
+    return fProxy->getGlyphCount();
+}
+
+uint16_t SkRandomScalerContext::generateCharToGlyph(SkUnichar uni) {
+    return fProxy->charToGlyphID(uni);
+}
+
+void SkRandomScalerContext::generateAdvance(SkGlyph* glyph) {
+    fProxy->getAdvance(glyph);
+}
+
+void SkRandomScalerContext::generateMetrics(SkGlyph* glyph) {
+    // Here we will change the mask format of the glyph
+    // NOTE this is being overridden by the base class
+    SkMask::Format format = SkMask::kARGB32_Format; // init to handle defective compilers
+    switch (glyph->getGlyphID() % 4) {
+        case 0:
+            format = SkMask::kLCD16_Format;
+            break;
+        case 1:
+            format = SkMask::kA8_Format;
+            break;
+        case 2:
+            format = SkMask::kARGB32_Format;
+            break;
+        case 3:
+            format = SkMask::kBW_Format;
+            break;
+    }
+
+    fProxy->getMetrics(glyph);
+
+    glyph->fMaskFormat = format;
+    if (fFakeIt) {
+        return;
+    }
+    if (SkMask::kARGB32_Format == format) {
+        SkPath path;
+        fProxy->getPath(glyph->getPackedID(), &path);
+
+        SkRect storage;
+        const SkPaint& paint = this->getRandomTypeface()->paint();
+        const SkRect& newBounds = paint.doComputeFastBounds(path.getBounds(),
+                                                            &storage,
+                                                            SkPaint::kFill_Style);
+        SkIRect ibounds;
+        newBounds.roundOut(&ibounds);
+        glyph->fLeft = ibounds.fLeft;
+        glyph->fTop = ibounds.fTop;
+        glyph->fWidth = ibounds.width();
+        glyph->fHeight = ibounds.height();
+    } else {
+        SkPath      devPath, fillPath;
+        SkMatrix    fillToDevMatrix;
+
+        this->internalGetPath(glyph->getPackedID(), &fillPath, &devPath, &fillToDevMatrix);
+
+        // just use devPath
+        const SkIRect ir = devPath.getBounds().roundOut();
+
+        if (ir.isEmpty() || !ir.is16Bit()) {
+            glyph->fLeft    = 0;
+            glyph->fTop     = 0;
+            glyph->fWidth   = 0;
+            glyph->fHeight  = 0;
+            return;
+        }
+        glyph->fLeft    = ir.fLeft;
+        glyph->fTop     = ir.fTop;
+        glyph->fWidth   = SkToU16(ir.width());
+        glyph->fHeight  = SkToU16(ir.height());
+
+        if (glyph->fWidth > 0) {
+            switch (glyph->fMaskFormat) {
+            case SkMask::kLCD16_Format:
+                glyph->fWidth += 2;
+                glyph->fLeft -= 1;
+                break;
+            default:
+                break;
+            }
+        }
+    }
+}
+
+void SkRandomScalerContext::generateImage(const SkGlyph& glyph) {
+    SkMask::Format format = (SkMask::Format)glyph.fMaskFormat;
+    switch (glyph.getGlyphID() % 4) {
+        case 0:
+            format = SkMask::kLCD16_Format;
+            break;
+        case 1:
+            format = SkMask::kA8_Format;
+            break;
+        case 2:
+            format = SkMask::kARGB32_Format;
+            break;
+        case 3:
+            format = SkMask::kBW_Format;
+            break;
+    }
+    const_cast<SkGlyph&>(glyph).fMaskFormat = format;
+
+    // if the format is ARGB, we just draw the glyph from path ourselves.  Otherwise, we force
+    // our proxy context to generate the image from paths.
+    if (!fFakeIt) {
+        if (SkMask::kARGB32_Format == glyph.fMaskFormat) {
+            SkPath path;
+            fProxy->getPath(glyph.getPackedID(), &path);
+
+            SkBitmap bm;
+            bm.installPixels(SkImageInfo::MakeN32Premul(glyph.fWidth, glyph.fHeight),
+                             glyph.fImage, glyph.rowBytes());
+            bm.eraseColor(0);
+
+            SkCanvas canvas(bm);
+            canvas.translate(-SkIntToScalar(glyph.fLeft),
+                             -SkIntToScalar(glyph.fTop));
+            canvas.drawPath(path, this->getRandomTypeface()->paint());
+        } else {
+            fProxy->forceGenerateImageFromPath();
+            fProxy->getImage(glyph);
+            fProxy->forceOffGenerateImageFromPath();
+        }
+    } else {
+        sk_bzero(glyph.fImage, glyph.computeImageSize());
+    }
+}
+
+void SkRandomScalerContext::generatePath(SkGlyphID glyph, SkPath* path) {
+    fProxy->generatePath(glyph, path);
+}
+
+void SkRandomScalerContext::generateFontMetrics(SkPaint::FontMetrics* metrics) {
+    fProxy->getFontMetrics(metrics);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+#include "SkTypefaceCache.h"
+
+SkRandomTypeface::SkRandomTypeface(sk_sp<SkTypeface> proxy, const SkPaint& paint, bool fakeIt)
+    : SkTypeface(proxy->fontStyle(), false)
+    , fProxy(std::move(proxy))
+    , fPaint(paint)
+    , fFakeIt(fakeIt) {}
+
+SkScalerContext* SkRandomTypeface::onCreateScalerContext(const SkScalerContextEffects& effects,
+                                                         const SkDescriptor* desc) const {
+    return new SkRandomScalerContext(sk_ref_sp(const_cast<SkRandomTypeface*>(this)),
+                                     effects, desc, fFakeIt);
+}
+
+void SkRandomTypeface::onFilterRec(SkScalerContextRec* rec) const {
+    fProxy->filterRec(rec);
+    rec->setHinting(SkPaint::kNo_Hinting);
+    rec->fMaskFormat = SkMask::kARGB32_Format;
+}
+
+std::unique_ptr<SkAdvancedTypefaceMetrics> SkRandomTypeface::onGetAdvancedMetrics() const {
+    return fProxy->getAdvancedMetrics();
+}
+
+SkStreamAsset* SkRandomTypeface::onOpenStream(int* ttcIndex) const {
+    return fProxy->openStream(ttcIndex);
+}
+
+void SkRandomTypeface::onGetFontDescriptor(SkFontDescriptor* desc,
+                                      bool* isLocal) const {
+    fProxy->getFontDescriptor(desc, isLocal);
+}
+
+int SkRandomTypeface::onCharsToGlyphs(const void* chars, Encoding encoding,
+                                 uint16_t glyphs[], int glyphCount) const {
+    return fProxy->charsToGlyphs(chars, encoding, glyphs, glyphCount);
+}
+
+int SkRandomTypeface::onCountGlyphs() const {
+    return fProxy->countGlyphs();
+}
+
+int SkRandomTypeface::onGetUPEM() const {
+    return fProxy->getUnitsPerEm();
+}
+
+void SkRandomTypeface::onGetFamilyName(SkString* familyName) const {
+    fProxy->getFamilyName(familyName);
+}
+
+SkTypeface::LocalizedStrings* SkRandomTypeface::onCreateFamilyNameIterator() const {
+    return fProxy->createFamilyNameIterator();
+}
+
+int SkRandomTypeface::onGetVariationDesignPosition(
+        SkFontArguments::VariationPosition::Coordinate coordinates[], int coordinateCount) const
+{
+    return fProxy->onGetVariationDesignPosition(coordinates, coordinateCount);
+}
+
+int SkRandomTypeface::onGetTableTags(SkFontTableTag tags[]) const {
+    return fProxy->getTableTags(tags);
+}
+
+size_t SkRandomTypeface::onGetTableData(SkFontTableTag tag, size_t offset,
+                                    size_t length, void* data) const {
+    return fProxy->getTableData(tag, offset, length, data);
+}
+
diff --git a/tools/SkRandomScalerContext.h b/tools/SkRandomScalerContext.h
new file mode 100644
index 0000000000..b71689d9e2
--- /dev/null
+++ b/tools/SkRandomScalerContext.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkRandomScalerContext_DEFINED
+#define SkRandomScalerContext_DEFINED
+
+#include "SkScalerContext.h"
+#include "SkTypeface.h"
+
+/*
+ * This scaler context is for debug only purposes.  It will 'randomly' but deterministically return
+ * LCD / A8 / BW / RBGA masks based off of the Glyph ID
+ */
+
+class SkRandomTypeface : public SkTypeface {
+public:
+    SkRandomTypeface(sk_sp<SkTypeface> proxy, const SkPaint&, bool fakeit);
+
+    SkTypeface* proxy() const { return fProxy.get(); }
+    const SkPaint& paint() const { return fPaint; }
+
+protected:
+    SkScalerContext* onCreateScalerContext(const SkScalerContextEffects&,
+                                           const SkDescriptor*) const override;
+    void onFilterRec(SkScalerContextRec*) const override;
+    std::unique_ptr<SkAdvancedTypefaceMetrics> onGetAdvancedMetrics() const override;
+    SkStreamAsset* onOpenStream(int* ttcIndex) const override;
+    void onGetFontDescriptor(SkFontDescriptor*, bool* isLocal) const override;
+
+    int onCharsToGlyphs(const void* chars, Encoding encoding,
+                        uint16_t glyphs[], int glyphCount) const override;
+    int onCountGlyphs() const override;
+    int onGetUPEM() const override;
+
+    void onGetFamilyName(SkString* familyName) const override;
+    SkTypeface::LocalizedStrings* onCreateFamilyNameIterator() const override;
+
+    int onGetVariationDesignPosition(SkFontArguments::VariationPosition::Coordinate coordinates[],
+                                     int coordinateCount) const override;
+    int onGetTableTags(SkFontTableTag tags[]) const override;
+    size_t onGetTableData(SkFontTableTag, size_t offset,
+                          size_t length, void* data) const override;
+
+private:
+    sk_sp<SkTypeface>   fProxy;
+    SkPaint             fPaint;
+    bool                fFakeIt;
+};
+
+#endif
diff --git a/tools/SkTestScalerContext.cpp b/tools/SkTestScalerContext.cpp
new file mode 100644
index 0000000000..34ec6af849
--- /dev/null
+++ b/tools/SkTestScalerContext.cpp
@@ -0,0 +1,290 @@
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkAdvancedTypefaceMetrics.h"
+#include "SkBitmap.h"
+#include "SkCanvas.h"
+#include "SkDescriptor.h"
+#include "SkFontDescriptor.h"
+#include "SkGlyph.h"
+#include "SkMakeUnique.h"
+#include "SkMask.h"
+#include "SkOTUtils.h"
+#include "SkPaintPriv.h"
+#include "SkScalerContext.h"
+#include "SkTestScalerContext.h"
+#include "SkTypefaceCache.h"
+
+SkTestFont::SkTestFont(const SkTestFontData& fontData)
+    : INHERITED()
+    , fCharCodes(fontData.fCharCodes)
+    , fCharCodesCount(fontData.fCharCodes ? fontData.fCharCodesCount : 0)
+    , fWidths(fontData.fWidths)
+    , fMetrics(fontData.fMetrics)
+    , fName(fontData.fName)
+    , fPaths(nullptr)
+{
+    init(fontData.fPoints, fontData.fVerbs);
+#ifdef SK_DEBUG
+    sk_bzero(fDebugBits, sizeof(fDebugBits));
+    sk_bzero(fDebugOverage, sizeof(fDebugOverage));
+#endif
+}
+
+SkTestFont::~SkTestFont() {
+    for (unsigned index = 0; index < fCharCodesCount; ++index) {
+        delete fPaths[index];
+    }
+    delete[] fPaths;
+}
+
+#ifdef SK_DEBUG
+
+#include "SkMutex.h"
+SK_DECLARE_STATIC_MUTEX(gUsedCharsMutex);
+
+#endif
+
+int SkTestFont::codeToIndex(SkUnichar charCode) const {
+#ifdef SK_DEBUG  // detect missing test font data
+    {
+        SkAutoMutexAcquire ac(gUsedCharsMutex);
+        if (charCode >= ' ' && charCode <= '~') {
+            int bitOffset = charCode - ' ';
+            fDebugBits[bitOffset >> 3] |= 1 << (bitOffset & 7);
+        } else {
+            int index = 0;
+            while (fDebugOverage[index] != 0 && fDebugOverage[index] != charCode
+                    && index < (int) sizeof(fDebugOverage)) {
+                ++index;
+            }
+            SkASSERT(index < (int) sizeof(fDebugOverage));
+            if (fDebugOverage[index] == 0) {
+                fDebugOverage[index] = charCode;
+            }
+        }
+    }
+#endif
+    for (unsigned index = 0; index < fCharCodesCount; ++index) {
+        if (fCharCodes[index] == (unsigned) charCode) {
+            return (int) index;
+        }
+    }
+
+    SkDEBUGF(("missing '%c' (%d) from %s (weight %d, width %d, slant %d)\n",
+              (char) charCode, charCode, fDebugName,
+              fDebugStyle.weight(), fDebugStyle.width(), fDebugStyle.slant()));
+    return 0;
+}
+
+void SkTestFont::init(const SkScalar* pts, const unsigned char* verbs) {
+    fPaths = new SkPath* [fCharCodesCount];
+    for (unsigned index = 0; index < fCharCodesCount; ++index) {
+        SkPath* path = new SkPath;
+        SkPath::Verb verb;
+        while ((verb = (SkPath::Verb) *verbs++) != SkPath::kDone_Verb) {
+            switch (verb) {
+                case SkPath::kMove_Verb:
+                    path->moveTo(pts[0], pts[1]);
+                    pts += 2;
+                    break;
+                case SkPath::kLine_Verb:
+                    path->lineTo(pts[0], pts[1]);
+                    pts += 2;
+                    break;
+                case SkPath::kQuad_Verb:
+                    path->quadTo(pts[0], pts[1], pts[2], pts[3]);
+                    pts += 4;
+                    break;
+                case SkPath::kCubic_Verb:
+                    path->cubicTo(pts[0], pts[1], pts[2], pts[3], pts[4], pts[5]);
+                    pts += 6;
+                    break;
+                case SkPath::kClose_Verb:
+                    path->close();
+                    break;
+                default:
+                    SkDEBUGFAIL("bad verb");
+                    return;
+            }
+        }
+        // This should make SkPath::getBounds() queries threadsafe.
+        path->updateBoundsCache();
+        fPaths[index] = path;
+    }
+}
+
+SkTestTypeface::SkTestTypeface(sk_sp<SkTestFont> testFont, const SkFontStyle& style)
+    : SkTypeface(style, false)
+    , fTestFont(std::move(testFont)) {
+}
+
+void SkTestTypeface::getAdvance(SkGlyph* glyph) {
+    // TODO(benjaminwagner): Update users to use floats.
+    glyph->fAdvanceX = SkFixedToFloat(fTestFont->fWidths[glyph->getGlyphID()]);
+    glyph->fAdvanceY = 0;
+}
+
+void SkTestTypeface::getFontMetrics(SkPaint::FontMetrics* metrics) {
+    *metrics = fTestFont->fMetrics;
+}
+
+void SkTestTypeface::getMetrics(SkGlyph* glyph) {
+    SkGlyphID glyphID = glyph->getGlyphID();
+    glyphID = glyphID < fTestFont->fCharCodesCount ? glyphID : 0;
+
+    // TODO(benjaminwagner): Update users to use floats.
+    glyph->fAdvanceX = SkFixedToFloat(fTestFont->fWidths[glyphID]);
+    glyph->fAdvanceY = 0;
+}
+
+void SkTestTypeface::getPath(SkGlyphID glyphID, SkPath* path) {
+    glyphID = glyphID < fTestFont->fCharCodesCount ? glyphID : 0;
+    *path = *fTestFont->fPaths[glyphID];
+}
+
+void SkTestTypeface::onFilterRec(SkScalerContextRec* rec) const {
+    rec->setHinting(SkPaint::kNo_Hinting);
+}
+
+std::unique_ptr<SkAdvancedTypefaceMetrics> SkTestTypeface::onGetAdvancedMetrics() const { // pdf only
+    std::unique_ptr<SkAdvancedTypefaceMetrics> info(new SkAdvancedTypefaceMetrics);
+    info->fFontName.set(fTestFont->fName);
+    int glyphCount = this->onCountGlyphs();
+
+    SkTDArray<SkUnichar>& toUnicode = info->fGlyphToUnicode;
+    toUnicode.setCount(glyphCount);
+    SkASSERT(glyphCount == SkToInt(fTestFont->fCharCodesCount));
+    for (int gid = 0; gid < glyphCount; ++gid) {
+        toUnicode[gid] = SkToS32(fTestFont->fCharCodes[gid]);
+    }
+    return info;
+}
+
+void SkTestTypeface::onGetFontDescriptor(SkFontDescriptor* desc, bool* isLocal) const {
+    desc->setFamilyName(fTestFont->fName);
+    desc->setStyle(this->fontStyle());
+    *isLocal = false;
+}
+
+int SkTestTypeface::onCharsToGlyphs(const void* chars, Encoding encoding,
+                                    uint16_t glyphs[], int glyphCount) const {
+    SkASSERT(encoding == kUTF32_Encoding);
+    for (int index = 0; index < glyphCount; ++index) {
+        SkUnichar ch = ((SkUnichar*) chars)[index];
+        glyphs[index] = fTestFont->codeToIndex(ch);
+    }
+    return glyphCount;
+}
+
+void SkTestTypeface::onGetFamilyName(SkString* familyName) const {
+    *familyName = fTestFont->fName;
+}
+
+SkTypeface::LocalizedStrings* SkTestTypeface::onCreateFamilyNameIterator() const {
+    SkString familyName(fTestFont->fName);
+    SkString language("und"); //undetermined
+    return new SkOTUtils::LocalizedStrings_SingleName(familyName, language);
+}
+
+class SkTestScalerContext : public SkScalerContext {
+public:
+    SkTestScalerContext(sk_sp<SkTestTypeface> face, const SkScalerContextEffects& effects,
+                        const SkDescriptor* desc)
+        : SkScalerContext(std::move(face), effects, desc)
+    {
+        fRec.getSingleMatrix(&fMatrix);
+        this->forceGenerateImageFromPath();
+    }
+
+protected:
+    SkTestTypeface* getTestTypeface() const {
+        return static_cast<SkTestTypeface*>(this->getTypeface());
+    }
+
+    unsigned generateGlyphCount() override {
+        return this->getTestTypeface()->onCountGlyphs();
+    }
+
+    uint16_t generateCharToGlyph(SkUnichar uni) override {
+        uint16_t glyph;
+        (void) this->getTestTypeface()->onCharsToGlyphs((const void *) &uni,
+                                                        SkTypeface::kUTF32_Encoding, &glyph, 1);
+        return glyph;
+    }
+
+    void generateAdvance(SkGlyph* glyph) override {
+        this->getTestTypeface()->getAdvance(glyph);
+
+        const SkVector advance = fMatrix.mapXY(SkFloatToScalar(glyph->fAdvanceX),
+                                               SkFloatToScalar(glyph->fAdvanceY));
+        glyph->fAdvanceX = SkScalarToFloat(advance.fX);
+        glyph->fAdvanceY = SkScalarToFloat(advance.fY);
+    }
+
+    void generateMetrics(SkGlyph* glyph) override {
+        this->getTestTypeface()->getMetrics(glyph);
+
+        const SkVector advance = fMatrix.mapXY(SkFloatToScalar(glyph->fAdvanceX),
+                                               SkFloatToScalar(glyph->fAdvanceY));
+        glyph->fAdvanceX = SkScalarToFloat(advance.fX);
+        glyph->fAdvanceY = SkScalarToFloat(advance.fY);
+
+        SkPath path;
+        this->getTestTypeface()->getPath(glyph->getGlyphID(), &path);
+        path.transform(fMatrix);
+
+        SkRect storage;
+        const SkPaint paint;
+        const SkRect& newBounds = paint.doComputeFastBounds(path.getBounds(),
+                                                            &storage,
+                                                            SkPaint::kFill_Style);
+        SkIRect ibounds;
+        newBounds.roundOut(&ibounds);
+        glyph->fLeft = ibounds.fLeft;
+        glyph->fTop = ibounds.fTop;
+        glyph->fWidth = ibounds.width();
+        glyph->fHeight = ibounds.height();
+    }
+
+    void generateImage(const SkGlyph& glyph) override {
+        SkPath path;
+        this->getTestTypeface()->getPath(glyph.getGlyphID(), &path);
+
+        SkBitmap bm;
+        bm.installPixels(SkImageInfo::MakeN32Premul(glyph.fWidth, glyph.fHeight),
+                            glyph.fImage, glyph.rowBytes());
+        bm.eraseColor(0);
+
+        SkCanvas canvas(bm);
+        canvas.translate(-SkIntToScalar(glyph.fLeft),
+                            -SkIntToScalar(glyph.fTop));
+        canvas.concat(fMatrix);
+        SkPaint paint;
+        paint.setAntiAlias(true);
+        canvas.drawPath(path, paint);
+    }
+
+    void generatePath(SkGlyphID glyph, SkPath* path) override {
+        this->getTestTypeface()->getPath(glyph, path);
+        path->transform(fMatrix);
+    }
+
+    void generateFontMetrics(SkPaint::FontMetrics* metrics) override {
+        this->getTestTypeface()->getFontMetrics(metrics);
+        SkPaintPriv::ScaleFontMetrics(metrics, fMatrix.getScaleY());
+    }
+
+private:
+    SkMatrix         fMatrix;
+};
+
+SkScalerContext* SkTestTypeface::onCreateScalerContext(
+    const SkScalerContextEffects& effects, const SkDescriptor* desc) const
+{
+    return new SkTestScalerContext(sk_ref_sp(const_cast<SkTestTypeface*>(this)), effects, desc);
+}
diff --git a/tools/SkTestScalerContext.h b/tools/SkTestScalerContext.h
new file mode 100644
index 0000000000..1d362901eb
--- /dev/null
+++ b/tools/SkTestScalerContext.h
@@ -0,0 +1,109 @@
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkTestScalerContext_DEFINED
+#define SkTestScalerContext_DEFINED
+
+#include "SkFixed.h"
+#include "SkPaint.h"
+#include "SkPath.h"
+#include "SkRefCnt.h"
+#include "SkTDArray.h"
+#include "SkTypeface.h"
+
+class SkTestFont;
+
+struct SkTestFontData {
+    const SkScalar* fPoints;
+    const unsigned char* fVerbs;
+    const unsigned* fCharCodes;
+    const size_t fCharCodesCount;
+    const SkFixed* fWidths;
+    const SkPaint::FontMetrics& fMetrics;
+    const char* fName;
+    SkFontStyle fStyle;
+    sk_sp<SkTestFont> fCachedFont;
+};
+
+class SkTestFont : public SkRefCnt {
+public:
+    SkTestFont(const SkTestFontData& );
+    virtual ~SkTestFont();
+    int codeToIndex(SkUnichar charCode) const;
+    void init(const SkScalar* pts, const unsigned char* verbs);
+#ifdef SK_DEBUG  // detect missing test font data
+    mutable unsigned char fDebugBits[16];
+    mutable SkUnichar fDebugOverage[8];
+    const char* fDebugName;
+    SkFontStyle fDebugStyle;
+    const char* debugFontName() const { return fName; }
+#endif
+private:
+    const unsigned* fCharCodes;
+    const size_t fCharCodesCount;
+    const SkFixed* fWidths;
+    const SkPaint::FontMetrics& fMetrics;
+    const char* fName;
+    SkPath** fPaths;
+    friend class SkTestTypeface;
+    typedef SkRefCnt INHERITED;
+};
+
+
+class SkTestTypeface : public SkTypeface {
+public:
+    SkTestTypeface(sk_sp<SkTestFont>, const SkFontStyle& style);
+    void getAdvance(SkGlyph* glyph);
+    void getFontMetrics(SkPaint::FontMetrics* metrics);
+    void getMetrics(SkGlyph* glyph);
+    void getPath(SkGlyphID glyph, SkPath* path);
+protected:
+    SkScalerContext* onCreateScalerContext(const SkScalerContextEffects&,
+                                           const SkDescriptor* desc) const override;
+    void onFilterRec(SkScalerContextRec* rec) const override;
+    std::unique_ptr<SkAdvancedTypefaceMetrics> onGetAdvancedMetrics() const override;
+
+    SkStreamAsset* onOpenStream(int* ttcIndex) const override {
+        return nullptr;
+    }
+
+    void onGetFontDescriptor(SkFontDescriptor* desc, bool* isLocal) const override;
+
+    int onCharsToGlyphs(const void* chars, Encoding encoding,
+                        uint16_t glyphs[], int glyphCount) const override;
+
+    int onCountGlyphs() const override {
+        return (int) fTestFont->fCharCodesCount;
+    }
+
+    int onGetUPEM() const override {
+        return 2048;
+    }
+
+    void onGetFamilyName(SkString* familyName) const override;
+    SkTypeface::LocalizedStrings* onCreateFamilyNameIterator() const override;
+
+    int onGetVariationDesignPosition(SkFontArguments::VariationPosition::Coordinate coordinates[],
+                                     int coordinateCount) const override
+    {
+        return 0;
+    }
+
+    int onGetTableTags(SkFontTableTag tags[]) const override {
+        return 0;
+    }
+
+    size_t onGetTableData(SkFontTableTag tag, size_t offset,
+                          size_t length, void* data) const override {
+        return 0;
+    }
+private:
+    sk_sp<SkTestFont> fTestFont;
+    friend class SkTestScalerContext;
+};
+
+#endif