This attempts to replicate some bad cache behavior Mozilla reported.

R=bsalomon@google.com

Author: robertphillips@google.com

Review URL: https://chromiumcodereview.appspot.com/22411005

git-svn-id: http://skia.googlecode.com/svn/trunk@10649 2bbb7eff-a529-9590-31e7-b0007b416f81

2 files changed, 92 insertions, 0 deletions

diff --git a/gyp/tests.gyp b/gyp/tests.gyp
index 0bb3550901..f58b0abff0 100644
--- a/gyp/tests.gyp
+++ b/gyp/tests.gyp
@@ -104,6 +104,7 @@
         '../tests/RefCntTest.cpp',
         '../tests/RefDictTest.cpp',
         '../tests/RegionTest.cpp',
+        '../tests/ResourceCacheTest.cpp',
         '../tests/RoundRectTest.cpp',
         '../tests/RTreeTest.cpp',
         '../tests/SHA1Test.cpp',
diff --git a/tests/ResourceCacheTest.cpp b/tests/ResourceCacheTest.cpp
new file mode 100644
index 0000000000..59182844fb
--- /dev/null
+++ b/tests/ResourceCacheTest.cpp
@@ -0,0 +1,91 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "Test.h"
+
+// This is a GPU test
+#if SK_SUPPORT_GPU
+#include "GrContextFactory.h"
+#include "SkGpuDevice.h"
+
+static const int gWidth = 640;
+static const int gHeight = 480;
+
+////////////////////////////////////////////////////////////////////////////////
+static void test_cache(skiatest::Reporter* reporter, 
+                       GrContext* context,
+                       SkCanvas* canvas) {
+    const SkIRect size = SkIRect::MakeWH(gWidth, gHeight);
+
+    SkBitmap src;
+    src.setConfig(SkBitmap::kARGB_8888_Config, size.width(), size.height());
+    src.allocPixels();
+    src.eraseColor(SK_ColorBLACK);
+    size_t srcSize = src.getSize();
+
+    size_t initialCacheSize = context->getGpuTextureCacheBytes();
+
+    int oldMaxNum;
+    size_t oldMaxBytes;
+    context->getTextureCacheLimits(&oldMaxNum, &oldMaxBytes);
+    
+    // Set the cache limits so we can fit 10 "src" images and the
+    // max number of textures doesn't matter
+    size_t maxCacheSize = initialCacheSize + 10*srcSize;
+    context->setTextureCacheLimits(1000, maxCacheSize);
+
+    SkBitmap readback;
+    readback.setConfig(SkBitmap::kARGB_8888_Config, size.width(), size.height());
+    readback.allocPixels();
+
+    for (int i = 0; i < 100; ++i) {
+        canvas->drawBitmap(src, 0, 0);
+        canvas->readPixels(size, &readback);
+
+        // "modify" the src texture
+        src.notifyPixelsChanged();
+
+        size_t curCacheSize = context->getGpuTextureCacheBytes();
+
+        // we should never go over the size limit
+        REPORTER_ASSERT(reporter, curCacheSize <= maxCacheSize);
+    }
+
+    context->setTextureCacheLimits(oldMaxNum, oldMaxBytes);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+static void TestResourceCache(skiatest::Reporter* reporter, GrContextFactory* factory) {
+    for (int type = 0; type < GrContextFactory::kLastGLContextType; ++type) {
+        GrContextFactory::GLContextType glType = static_cast<GrContextFactory::GLContextType>(type);
+        if (!GrContextFactory::IsRenderingGLContext(glType)) {
+            continue;
+        }
+        GrContext* context = factory->get(glType);
+        if (NULL == context) {
+            continue;
+        }
+
+        GrTextureDesc desc;
+        desc.fConfig = kSkia8888_GrPixelConfig;
+        desc.fFlags = kRenderTarget_GrTextureFlagBit;
+        desc.fWidth = gWidth;
+        desc.fHeight = gHeight;
+
+        SkAutoTUnref<GrTexture> texture(context->createUncachedTexture(desc, NULL, 0));
+        SkAutoTUnref<SkGpuDevice> device(SkNEW_ARGS(SkGpuDevice, (context, texture.get())));
+        SkCanvas canvas(device.get());
+
+        test_cache(reporter, context, &canvas);
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+#include "TestClassDef.h"
+DEFINE_GPUTESTCLASS("ResourceCache", ResourceCacheTestClass, TestResourceCache)
+
+#endif