Fix for 510931, merge to m44

tests/TextBlobCacheTest.cpp

Index: tests/TextBlobCacheTest.cpp
diff --git a/tests/TextBlobCacheTest.cpp b/tests/TextBlobCacheTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..c063040ecf2113fcb6f35a07c35c56b818aee74f
--- /dev/null
+++ b/tests/TextBlobCacheTest.cpp
@@ -0,0 +1,164 @@
+/*
+ * 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 "sk_tool_utils.h"
+#include "SkCanvas.h"
+#include "SkPaint.h"
+#include "SkPoint.h"
+#include "SkTextBlob.h"
+#include "SkFontMgr.h"
+#include "SkGraphics.h"
+#include "SkSurface.h"
+#include "SkTypeface.h"
+#include "../src/fonts/SkRandomScalerContext.h"
+
+#ifdef SK_BUILD_FOR_WIN
+    #include "SkTypeface_win.h"
+#endif
+
+#include "Test.h"
+
+#if SK_SUPPORT_GPU
+#include "GrContextFactory.h"
+
+struct TextBlobWrapper {
+    // This class assumes it 'owns' the textblob it wraps, and thus does not need to take a ref
+    explicit TextBlobWrapper(const SkTextBlob* blob) : fBlob(blob) {}
+    TextBlobWrapper(const TextBlobWrapper& blob) : fBlob(SkRef(blob.fBlob.get())) {}
+
+    SkAutoTUnref<const SkTextBlob> fBlob;
+};
+
+static void draw(SkCanvas* canvas, int redraw, const SkTArray<TextBlobWrapper>& blobs) {
+    int yOffset = 0;
+    for (int r = 0; r < redraw; r++) {
+        for (int i = 0; i < blobs.count(); i++) {
+            const SkTextBlob* blob = blobs[i].fBlob.get();
+            const SkRect& bounds = blob->bounds();
+            yOffset += SkScalarCeilToInt(bounds.height());
+            SkPaint paint;
+            canvas->drawTextBlob(blob, 0, SkIntToScalar(yOffset), paint);
+        }
+    }
+}
+
+static const int kWidth = 1024;
+static const int kHeight = 768;
+
+// This test hammers the GPU textblobcache and font atlas
+static void text_blob_cache_inner(skiatest::Reporter* reporter, GrContextFactory* factory,
+                                  int maxTotalText, int maxGlyphID, int maxFamilies, bool normal) {
+    // setup surface
+    uint32_t flags = 0;
+    SkSurfaceProps props(flags, SkSurfaceProps::kLegacyFontHost_InitType);
+
+    // We don't typically actually draw with this unittest
+    GrContext* ctx = factory->get(GrContextFactory::kNull_GLContextType);
+    SkImageInfo info = SkImageInfo::Make(kWidth, kHeight, kN32_SkColorType, kPremul_SkAlphaType);
+    SkAutoTUnref<SkSurface> surface(SkSurface::NewRenderTarget(ctx, SkSurface::kNo_Budgeted, info,
+                                                               0, &props));
+    REPORTER_ASSERT(reporter, surface);
+    if (!surface) {
+        return;
+    }
+
+    SkCanvas* canvas = surface->getCanvas();
+
+    SkAutoTUnref<SkFontMgr> fm(SkFontMgr::RefDefault());
+
+    int count = SkMin32(fm->countFamilies(), maxFamilies);
+
+    // make a ton of text
+    SkAutoTArray<uint16_t> text(maxTotalText);
+    for (int i = 0; i < maxTotalText; i++) {
+        text[i] = i % maxGlyphID;
+    }
+
+    // generate textblobs
+    SkTArray<TextBlobWrapper> blobs;
+    for (int i = 0; i < count; i++) {
+        SkPaint paint;
+        paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
+        paint.setTextSize(48); // draw big glyphs to really stress the atlas
+
+        SkString familyName;
+        fm->getFamilyName(i, &familyName);
+        SkAutoTUnref<SkFontStyleSet> set(fm->createStyleSet(i));
+        for (int j = 0; j < set->count(); ++j) {
+            SkFontStyle fs;
+            set->getStyle(j, &fs, NULL);
+
+            // We use a typeface which randomy returns unexpected mask formats to fuzz
+            SkAutoTUnref<SkTypeface> orig(set->createTypeface(j));
+            if (normal) {
+                paint.setTypeface(orig);
+            } else {
+                SkAutoTUnref<SkTypeface> typeface(SkNEW_ARGS(SkRandomTypeface, (orig, paint, true)));
+                paint.setTypeface(typeface);
+            }
+
+            SkTextBlobBuilder builder;
+            for (int aa = 0; aa < 2; aa++) {
+                for (int subpixel = 0; subpixel < 2; subpixel++) {
+                    for (int lcd = 0; lcd < 2; lcd++) {
+                        paint.setAntiAlias(SkToBool(aa));
+                        paint.setSubpixelText(SkToBool(subpixel));
+                        paint.setLCDRenderText(SkToBool(lcd));
+                        if (!SkToBool(lcd)) {
+                            paint.setTextSize(160);
+                        }
+                        const SkTextBlobBuilder::RunBuffer& run = builder.allocRun(paint,
+                                                                                   maxTotalText,
+                                                                                   0, 0,
+                                                                                   NULL);
+                        memcpy(run.glyphs, text.get(), maxTotalText * sizeof(uint16_t));
+                    }
+                }
+            }
+            SkNEW_APPEND_TO_TARRAY(&blobs, TextBlobWrapper, (builder.build()));
+        }
+    }
+
+    // create surface where LCD is impossible
+    info = SkImageInfo::MakeN32Premul(kWidth, kHeight);
+    SkSurfaceProps propsNoLCD(0, kUnknown_SkPixelGeometry);
+    SkAutoTUnref<SkSurface> surfaceNoLCD(canvas->newSurface(info, &propsNoLCD));
+    REPORTER_ASSERT(reporter, surface);
+    if (!surface) {
+        return;
+    }
+
+    SkCanvas* canvasNoLCD = surfaceNoLCD->getCanvas();
+
+    // test redraw
+    draw(canvas, 2, blobs);
+    draw(canvasNoLCD, 2, blobs);
+
+    // test draw after free
+    ctx->freeGpuResources();
+    draw(canvas, 1, blobs);
+
+    ctx->freeGpuResources();
+    draw(canvasNoLCD, 1, blobs);
+
+    // test draw after abandon
+    ctx->abandonContext();
+    draw(canvas, 1, blobs);
+}
+
+DEF_GPUTEST(TextBlobCache, reporter, factory) {
+    text_blob_cache_inner(reporter, factory, 4096, 256, 30, true);
+}
+
+DEF_GPUTEST(TextBlobAbnormal, reporter, factory) {
+#ifdef SK_BUILD_FOR_ANDROID
+    text_blob_cache_inner(reporter, factory, 256, 256, 30, false);
+#else
+    text_blob_cache_inner(reporter, factory, 512, 256, 30, false);
+#endif
+}
+#endif