Return NULL when building empty LayerRasterizer.
In SkLayerRasterizer::snapshotRasterizer() and ::detachRasterizer(),
if no layers have been added, do not attempt to create an
SkLayerRasterizer. Instead, return NULL.
This fixes an error when running tests on Android.
Update dox to state that NULL may be returned.
Add tests.
R=reed@google.com
Author: scroggo@google.com
Review URL: https://codereview.chromium.org/313653006
diff --git a/tests/LayerRasterizerTest.cpp b/tests/LayerRasterizerTest.cpp
index 8e6b64c..640c581 100644
--- a/tests/LayerRasterizerTest.cpp
+++ b/tests/LayerRasterizerTest.cpp
@@ -81,6 +81,7 @@
DEF_TEST(LayerRasterizer_copy, reporter) {
SkLayerRasterizer::Builder builder;
+ REPORTER_ASSERT(reporter, NULL == builder.snapshotRasterizer());
SkPaint paint;
// Create a bunch of paints with different flags.
for (uint32_t flags = 0x01; flags < SkPaint::kAllFlags; flags <<= 1) {
@@ -136,3 +137,8 @@
}
}
}
+
+DEF_TEST(LayerRasterizer_detachEmpty, reporter) {
+ SkLayerRasterizer::Builder builder;
+ REPORTER_ASSERT(reporter, NULL == builder.detachRasterizer());
+}