Initial version of R8 support
http://codereview.appspot.com/5967067/
git-svn-id: http://skia.googlecode.com/svn/trunk@3622 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/ReadWriteAlphaTest.cpp b/tests/ReadWriteAlphaTest.cpp
new file mode 100644
index 0000000..2d6da96
--- /dev/null
+++ b/tests/ReadWriteAlphaTest.cpp
@@ -0,0 +1,103 @@
+
+/*
+ * Copyright 2012 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 "SkGpuDevice.h"
+
+static const int X_SIZE = 12;
+static const int Y_SIZE = 12;
+
+void ReadWriteAlphaTest(skiatest::Reporter* reporter, GrContext* context) {
+
+ unsigned char textureData[X_SIZE][Y_SIZE];
+
+ memset(textureData, 0, X_SIZE * Y_SIZE);
+
+ GrTextureDesc desc;
+
+ // let Skia know we will be using this texture as a render target
+ desc.fFlags = kRenderTarget_GrTextureFlagBit;
+ // it is a single channel texture
+ desc.fConfig = kAlpha_8_GrPixelConfig;
+ desc.fWidth = X_SIZE;
+ desc.fHeight = Y_SIZE;
+ desc.fSampleCnt = 0;
+
+ // We are initializing the texture with zeros here
+ GrTexture* texture = context->createUncachedTexture(desc, textureData, 0);
+ if (!texture) {
+ return;
+ }
+
+ GrAutoUnref au(texture);
+
+ // create a distinctive texture
+ for (int y = 0; y < Y_SIZE; ++y) {
+ for (int x = 0; x < X_SIZE; ++x) {
+ textureData[x][y] = x*Y_SIZE+y;
+ }
+ }
+
+ // upload the texture
+ texture->writePixels(0, 0, desc.fWidth, desc.fHeight, desc.fConfig,
+ textureData, 0);
+
+ unsigned char readback[X_SIZE][Y_SIZE];
+
+ // clear readback to something non-zero so we can detect readback failures
+ memset(readback, 0x1, X_SIZE * Y_SIZE);
+
+ // read the texture back
+ texture->readPixels(0, 0, desc.fWidth, desc.fHeight, desc.fConfig,
+ readback, 0);
+
+ // make sure the original & read back versions match
+ bool match = true;
+
+ for (int y = 0; y < Y_SIZE; ++y) {
+ for (int x = 0; x < X_SIZE; ++x) {
+ if (textureData[x][y] != readback[x][y]) {
+ match = false;
+ }
+ }
+ }
+
+ REPORTER_ASSERT(reporter, match);
+
+ // Now try writing on the single channel texture
+ SkCanvas canvas;
+
+ canvas.setDevice(new SkGpuDevice(context, texture->asRenderTarget()))->unref();
+
+ SkPaint paint;
+
+ const SkRect rect = SkRect::MakeLTRB(-10, -10, X_SIZE + 10, Y_SIZE + 10);
+
+ paint.setColor(SK_ColorWHITE);
+
+ canvas.drawRect(rect, paint);
+
+ texture->readPixels(0, 0, desc.fWidth, desc.fHeight, desc.fConfig,
+ readback, 0);
+
+ match = true;
+
+ for (int y = 0; y < Y_SIZE; ++y) {
+ for (int x = 0; x < X_SIZE; ++x) {
+ if (0xFF != readback[x][y]) {
+ match = false;
+ }
+ }
+ }
+
+ REPORTER_ASSERT(reporter, match);
+}
+
+#include "TestClassDef.h"
+DEFINE_GPUTESTCLASS("ReadWriteAlpha", ReadWriteAlphaTestClass, ReadWriteAlphaTest)
+