Fix for 510931, merge to m44

src/fonts/SkRandomScalerContext.cpp

Index: src/fonts/SkRandomScalerContext.cpp
diff --git a/src/fonts/SkRandomScalerContext.cpp b/src/fonts/SkRandomScalerContext.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..799e51df820e5b9803e6a1aa55786420bd9c5caa
--- /dev/null
+++ b/src/fonts/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 "SkRandomScalerContext.h"
+#include "SkGlyph.h"
+#include "SkPath.h"
+#include "SkCanvas.h"
+#include "SkRasterizer.h"
+
+class SkRandomScalerContext : public SkScalerContext {
+public:
+    SkRandomScalerContext(SkRandomTypeface*, const SkDescriptor*, bool fFakeIt);
+    virtual ~SkRandomScalerContext();
+
+protected:
+    unsigned generateGlyphCount() override;
+    uint16_t generateCharToGlyph(SkUnichar) override;
+    void generateAdvance(SkGlyph*) override;
+    void generateMetrics(SkGlyph*) override;
+    void generateImage(const SkGlyph&) override;
+    void generatePath(const SkGlyph&, SkPath*) override;
+    void generateFontMetrics(SkPaint::FontMetrics*) override;
+
+private:
+    SkRandomTypeface*     fFace;
+    SkScalerContext* fProxy;
+    bool fFakeIt;
+};
+
+#define STD_SIZE    1
+
+#include "SkDescriptor.h"
+
+SkRandomScalerContext::SkRandomScalerContext(SkRandomTypeface* face, const SkDescriptor* desc,
+                                             bool fakeIt)
+        : SkScalerContext(face, desc)
+        , fFace(face)
+        , fFakeIt(fakeIt) {
+    fProxy = face->proxy()->createScalerContext(desc);
+}
+
+SkRandomScalerContext::~SkRandomScalerContext() {
+    SkDELETE(fProxy);
+}
+
+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;
+    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, &path);
+
+        SkRect storage;
+        const SkPaint& paint = fFace->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, &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, &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, fFace->paint());
+        } else {
+            fProxy->forceGenerateImageFromPath();
+            fProxy->getImage(glyph);
+            fProxy->forceOffGenerateImageFromPath();
+        }
+    } else {
+        sk_bzero(glyph.fImage, glyph.computeImageSize());
+    }
+}
+
+void SkRandomScalerContext::generatePath(const SkGlyph& glyph, SkPath* path) {
+    fProxy->getPath(glyph, path);
+}
+
+void SkRandomScalerContext::generateFontMetrics(SkPaint::FontMetrics* metrics) {
+    fProxy->getFontMetrics(metrics);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+#include "SkTypefaceCache.h"
+
+SkRandomTypeface::SkRandomTypeface(SkTypeface* proxy, const SkPaint& paint, bool fakeIt)
+    : SkTypeface(proxy->fontStyle(), SkTypefaceCache::NewFontID(), false)
+    , fProxy(SkRef(proxy))
+    , fPaint(paint)
+    , fFakeIt(fakeIt) {}
+
+SkRandomTypeface::~SkRandomTypeface() {
+    fProxy->unref();
+}
+
+SkScalerContext* SkRandomTypeface::onCreateScalerContext(
+                                            const SkDescriptor* desc) const {
+    return SkNEW_ARGS(SkRandomScalerContext, (const_cast<SkRandomTypeface*>(this), desc, fFakeIt));
+}
+
+void SkRandomTypeface::onFilterRec(SkScalerContextRec* rec) const {
+    fProxy->filterRec(rec);
+    rec->setHinting(SkPaint::kNo_Hinting);
+    rec->fMaskFormat = SkMask::kARGB32_Format;
+}
+
+SkAdvancedTypefaceMetrics* SkRandomTypeface::onGetAdvancedTypefaceMetrics(
+                                PerGlyphInfo info,
+                                const uint32_t* glyphIDs,
+                                uint32_t glyphIDsCount) const {
+    return fProxy->getAdvancedTypefaceMetrics(info, glyphIDs, glyphIDsCount);
+}
+
+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::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);
+}
+