Add unit test for clear bug

Bug: 768134
Change-Id: Ifb5a0eaeb85a8f399204467c22d0845d630d0d3d
Reviewed-on: https://skia-review.googlesource.com/60562
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>

1 files changed, 62 insertions, 0 deletions

diff --git a/tests/ClearTest.cpp b/tests/ClearTest.cpp
index bcd0899867..034ff95f73 100644
--- a/tests/ClearTest.cpp
+++ b/tests/ClearTest.cpp
@@ -11,6 +11,9 @@
 #include "GrContext.h"
 #include "GrRenderTargetContext.h"
 
+#include "SkCanvas.h"
+#include "SkSurface.h"
+
 static bool check_rect(GrRenderTargetContext* rtc, const SkIRect& rect, uint32_t expectedValue,
                        uint32_t* actualValue, int* failX, int* failY) {
     int w = rect.width();
@@ -202,4 +205,63 @@ DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ClearOp, reporter, ctxInfo) {
                failX, failY);
     }
 }
+
+// From crbug.com/768134
+DEF_GPUTEST_FOR_RENDERING_CONTEXTS(FullScreenClearWithLayers, reporter, ctxInfo) {
+    GrContext* context = ctxInfo.grContext();
+
+    const SkImageInfo ii = SkImageInfo::Make(400, 77, kRGBA_8888_SkColorType, kPremul_SkAlphaType);
+
+    sk_sp<SkSurface> surf = SkSurface::MakeRenderTarget(context, SkBudgeted::kYes, ii);
+    SkCanvas* canvas = surf->getCanvas();
+
+    SkPaint paints[2];
+    paints[0].setColor(SK_ColorGREEN);
+    paints[1].setColor(SK_ColorGRAY);
+
+    static const int kLeftX = 158;
+    static const int kMidX = 258;
+    static const int kRightX = 383;
+    static const int kTopY = 26;
+    static const int kBotY = 51;
+
+    const SkRect rects[2] = {
+        { kLeftX, kTopY, kMidX, kBotY },
+        { kMidX, kTopY, kRightX, kBotY },
+    };
+
+    for (int i = 0; i < 2; ++i) {
+        // the bounds parameter is required to cause a full screen clear
+        canvas->saveLayer(&rects[i], nullptr);
+            canvas->drawRect(rects[i], paints[i]);
+        canvas->restore();
+    }
+
+    SkBitmap bm;
+    bm.allocPixels(ii, 0);
+
+    SkAssertResult(surf->readPixels(bm, 0, 0));
+
+    bool isCorrect = true;
+    for (int y = kTopY; isCorrect && y < kBotY; ++y) {
+        const uint32_t* sl = bm.getAddr32(0, y);
+
+        for (int x = kLeftX; x < kMidX; ++x) {
+            if (SK_ColorGREEN != sl[x]) {
+                isCorrect = false;
+                break;
+            }
+        }
+
+        for (int x = kMidX; x < kRightX; ++x) {
+            if (SK_ColorGRAY != sl[x]) {
+                isCorrect = false;
+                break;
+            }
+        }
+    }
+
+    REPORTER_ASSERT(reporter, isCorrect);
+}
+
 #endif