Modify SkLazyPixelRef to use SkImageGenerator.

tests/DrawBitmapRectTest.cpp

 
 /*
  * Copyright 2011 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"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkData.h"
 #include "SkPaint.h"
 #include "SkShader.h"
 #include "SkSurface.h"
 #include "SkRandom.h"
 #include "SkMatrixUtils.h"
 
 #include "SkLazyPixelRef.h"
 #include "SkLruImageCache.h"
 
-// A BitmapFactory that always fails when asked to return pixels.
-static bool FailureDecoder(const void* data, size_t length, SkImageInfo* info,
-                           const SkBitmapFactory::Target* target) {
-    if (info) {
-        info->fWidth = info->fHeight = 100;
-        info->fColorType = kRGBA_8888_SkColorType;
-        info->fAlphaType = kPremul_SkAlphaType;
+
+namespace {
+// A SkImageGenerator that always fails when asked to return pixels.
+class FailureImageGenerator : public SkImageGenerator {
+public:
+    FailureImageGenerator() { }
+    virtual ~FailureImageGenerator() { }
+    virtual bool getInfo(SkImageInfo* info) SK_OVERRIDE {
+        if (info) {
+            info->fWidth = info->fHeight = 100;
+            info->fColorType = kRGBA_8888_SkColorType;
+            info->fAlphaType = kPremul_SkAlphaType;
+        }
+        return true;
     }
-    // this will deliberately return false if they are asking us to decode
-    // into pixels.
-    return NULL == target;
-}
+    virtual bool getPixels(const SkImageInfo&, void*, size_t) SK_OVERRIDE {
+        return false;
+    }
+};
+}  // namespace
 
 // crbug.com/295895
 // Crashing in skia when a pixelref fails in lockPixels
 //
 static void test_faulty_pixelref(skiatest::Reporter* reporter) {
     // need a cache, but don't expect to use it, so the budget is not critical
     SkLruImageCache cache(10 * 1000);
     // construct a garbage data represent "bad" encoded data.
     SkAutoDataUnref data(SkData::NewFromMalloc(malloc(1000), 1000));
-    SkAutoTUnref<SkPixelRef> pr(new SkLazyPixelRef(data, FailureDecoder, &cache));
 
+    FailureImageGenerator* gen(SkNEW(FailureImageGenerator));
     SkBitmap bm;
-    bm.setConfig(SkBitmap::kARGB_8888_Config, 100, 100);
-    bm.setPixelRef(pr);
+    bool lazyPixelRefSuccess = SkLazyPixelRef::Install(gen, &cache, &bm);
+    REPORTER_ASSERT(reporter, lazyPixelRefSuccess);
     // now our bitmap has a pixelref, but we know it will fail to lock
 
     SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterPMColor(200, 200));
     SkCanvas* canvas = surface->getCanvas();
 
     const SkPaint::FilterLevel levels[] = {
         SkPaint::kNone_FilterLevel,
         SkPaint::kLow_FilterLevel,
         SkPaint::kMedium_FilterLevel,
         SkPaint::kHigh_FilterLevel,
     };
 
     SkPaint paint;
     canvas->scale(2, 2);    // need a scale, otherwise we may ignore filtering
     for (size_t i = 0; i < SK_ARRAY_COUNT(levels); ++i) {
         paint.setFilterLevel(levels[i]);
         canvas->drawBitmap(bm, 0, 0, &paint);
     }
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
-static void rand_matrix(SkMatrix* mat, SkRandom& rand, unsigned mask) {
+static void rand_matrix(SkMatrix* mat, SkRandom* rand, unsigned mask) {
     mat->setIdentity();
     if (mask & SkMatrix::kTranslate_Mask) {
-        mat->postTranslate(rand.nextSScalar1(), rand.nextSScalar1());
+        mat->postTranslate(rand->nextSScalar1(), rand->nextSScalar1());
     }
     if (mask & SkMatrix::kScale_Mask) {
-        mat->postScale(rand.nextSScalar1(), rand.nextSScalar1());
+        mat->postScale(rand->nextSScalar1(), rand->nextSScalar1());
     }
     if (mask & SkMatrix::kAffine_Mask) {
-        mat->postRotate(rand.nextSScalar1() * 360);
+        mat->postRotate(rand->nextSScalar1() * 360);
     }
     if (mask & SkMatrix::kPerspective_Mask) {
-        mat->setPerspX(rand.nextSScalar1());
-        mat->setPerspY(rand.nextSScalar1());
+        mat->setPerspX(rand->nextSScalar1());
+        mat->setPerspY(rand->nextSScalar1());
     }
 }
 
-static void rand_size(SkISize* size, SkRandom& rand) {
-    size->set(rand.nextU() & 0xFFFF, rand.nextU() & 0xFFFF);
+static void rand_size(SkISize* size, SkRandom* rand) {
+    size->set(rand->nextU() & 0xFFFF, rand->nextU() & 0xFFFF);
 }
 
 static bool treat_as_sprite(const SkMatrix& mat, const SkISize& size,
                             unsigned bits) {
     return SkTreatAsSprite(mat, size.width(), size.height(), bits);
 }
 
 static void test_treatAsSprite(skiatest::Reporter* reporter) {
     const unsigned bilerBits = kSkSubPixelBitsForBilerp;
 
     SkMatrix mat;
     SkISize  size;
     SkRandom rand;
 
     // assert: translate-only no-filter can always be treated as sprite
     for (int i = 0; i < 1000; ++i) {
-        rand_matrix(&mat, rand, SkMatrix::kTranslate_Mask);
+        rand_matrix(&mat, &rand, SkMatrix::kTranslate_Mask);
         for (int j = 0; j < 1000; ++j) {
-            rand_size(&size, rand);
+            rand_size(&size, &rand);
             REPORTER_ASSERT(reporter, treat_as_sprite(mat, size, 0));
         }
     }
 
     // assert: rotate/perspect is never treated as sprite
     for (int i = 0; i < 1000; ++i) {
-        rand_matrix(&mat, rand, SkMatrix::kAffine_Mask | SkMatrix::kPerspective_Mask);
+        rand_matrix(&mat, &rand, SkMatrix::kAffine_Mask | SkMatrix::kPerspective_Mask);
         for (int j = 0; j < 1000; ++j) {
-            rand_size(&size, rand);
+            rand_size(&size, &rand);
             REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, 0));
             REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, bilerBits));
         }
     }
 
     size.set(500, 600);
 
     const SkScalar tooMuchSubpixel = SkFloatToScalar(100.1f);
     mat.setTranslate(tooMuchSubpixel, 0);
     REPORTER_ASSERT(reporter, !treat_as_sprite(mat, size, bilerBits));
@@ skipping 194 matching lines @@
 
     test_nan_antihair();
     test_giantrepeat_crbug118018(reporter);
 
     test_treatAsSprite(reporter);
     test_faulty_pixelref(reporter);
 }
 
 #include "TestClassDef.h"
 DEFINE_TESTCLASS("DrawBitmapRect", TestDrawBitmapRectClass, TestDrawBitmapRect)