Create a semi-stable API for capturing the state of an SkCanvas and reconstructing that state across different versions of Skia.
R=joth@chromium.org, mtklein@google.com, reed@google.com, scroggo@google.com
Committed: https://code.google.com/p/skia/source/detail?r=11010
Review URL: https://codereview.chromium.org/23545017
git-svn-id: http://skia.googlecode.com/svn/trunk@11013 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/CanvasStateTest.cpp b/tests/CanvasStateTest.cpp
new file mode 100644
index 0000000..bb7d9e2
--- /dev/null
+++ b/tests/CanvasStateTest.cpp
@@ -0,0 +1,140 @@
+
+/*
+ * 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"
+#include "SkBitmapDevice.h"
+#include "SkCanvas.h"
+#include "SkCanvasStateUtils.h"
+#include "SkDrawFilter.h"
+#include "SkPaint.h"
+#include "SkRect.h"
+#include "SkRRect.h"
+
+static void test_complex_layers(skiatest::Reporter* reporter) {
+
+ const int WIDTH = 400;
+ const int HEIGHT = 400;
+ const int SPACER = 10;
+
+ SkRect rect = SkRect::MakeXYWH(SPACER, SPACER, WIDTH-(2*SPACER), (HEIGHT-(2*SPACER)) / 7);
+
+ const SkBitmap::Config configs[] = { SkBitmap::kRGB_565_Config,
+ SkBitmap::kARGB_8888_Config
+ };
+ const int configCount = sizeof(configs) / sizeof(SkBitmap::Config);
+
+ const int layerAlpha[] = { 255, 255, 0 };
+ const SkCanvas::SaveFlags flags[] = { SkCanvas::kARGB_NoClipLayer_SaveFlag,
+ SkCanvas::kARGB_ClipLayer_SaveFlag,
+ SkCanvas::kARGB_NoClipLayer_SaveFlag
+ };
+ REPORTER_ASSERT(reporter, sizeof(layerAlpha) == sizeof(flags));
+ const int layerCombinations = sizeof(layerAlpha) / sizeof(int);
+
+ for (int i = 0; i < configCount; ++i) {
+ SkBitmap bitmaps[2];
+ for (int j = 0; j < 2; ++j) {
+ bitmaps[j].setConfig(configs[i], WIDTH, HEIGHT);
+ bitmaps[j].allocPixels();
+
+ SkCanvas canvas(bitmaps[j]);
+
+ canvas.drawColor(SK_ColorRED);
+
+ for (int k = 0; k < layerCombinations; ++k) {
+ // draw a rect within the layer's bounds and again outside the layer's bounds
+ canvas.saveLayerAlpha(&rect, layerAlpha[k], flags[k]);
+
+ SkCanvasState* state = NULL;
+ SkCanvas* tmpCanvas = NULL;
+ if (j) {
+ state = SkCanvasStateUtils::CaptureCanvasState(&canvas);
+ REPORTER_ASSERT(reporter, state);
+ tmpCanvas = SkCanvasStateUtils::CreateFromCanvasState(state);
+ REPORTER_ASSERT(reporter, tmpCanvas);
+ } else {
+ tmpCanvas = SkRef(&canvas);
+ }
+
+ SkPaint bluePaint;
+ bluePaint.setColor(SK_ColorBLUE);
+ bluePaint.setStyle(SkPaint::kFill_Style);
+
+ tmpCanvas->drawRect(rect, bluePaint);
+ tmpCanvas->translate(0, rect.height() + SPACER);
+ tmpCanvas->drawRect(rect, bluePaint);
+
+ tmpCanvas->unref();
+ SkCanvasStateUtils::ReleaseCanvasState(state);
+
+ canvas.restore();
+
+ // translate the canvas for the next iteration
+ canvas.translate(0, 2*(rect.height() + SPACER));
+ }
+ }
+
+ // now we memcmp the two bitmaps
+ REPORTER_ASSERT(reporter, bitmaps[0].getSize() == bitmaps[1].getSize());
+ REPORTER_ASSERT(reporter, !memcmp(bitmaps[0].getPixels(),
+ bitmaps[1].getPixels(),
+ bitmaps[0].getSize()));
+ }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+class TestDrawFilter : public SkDrawFilter {
+public:
+ virtual bool filter(SkPaint*, Type) SK_OVERRIDE { return true; }
+};
+
+static void test_draw_filters(skiatest::Reporter* reporter) {
+ TestDrawFilter drawFilter;
+ SkBitmapDevice device(SkBitmap::kARGB_8888_Config, 10, 10);
+ SkCanvas canvas(&device);
+
+ canvas.setDrawFilter(&drawFilter);
+
+ SkCanvasState* state = SkCanvasStateUtils::CaptureCanvasState(&canvas);
+ REPORTER_ASSERT(reporter, state);
+ SkCanvas* tmpCanvas = SkCanvasStateUtils::CreateFromCanvasState(state);
+ REPORTER_ASSERT(reporter, tmpCanvas);
+
+ REPORTER_ASSERT(reporter, NULL != canvas.getDrawFilter());
+ REPORTER_ASSERT(reporter, NULL == tmpCanvas->getDrawFilter());
+
+ tmpCanvas->unref();
+ SkCanvasStateUtils::ReleaseCanvasState(state);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+static void test_soft_clips(skiatest::Reporter* reporter) {
+ SkBitmapDevice device(SkBitmap::kARGB_8888_Config, 10, 10);
+ SkCanvas canvas(&device);
+
+ SkRRect roundRect;
+ roundRect.setOval(SkRect::MakeWH(5, 5));
+
+ canvas.clipRRect(roundRect, SkRegion::kIntersect_Op, true);
+
+ SkCanvasState* state = SkCanvasStateUtils::CaptureCanvasState(&canvas);
+ REPORTER_ASSERT(reporter, !state);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+static void test_canvas_state_utils(skiatest::Reporter* reporter) {
+ test_complex_layers(reporter);
+ test_draw_filters(reporter);
+ test_soft_clips(reporter);
+}
+
+#include "TestClassDef.h"
+DEFINE_TESTCLASS("CanvasState", TestCanvasStateClass, test_canvas_state_utils)