add GM to test imagefilters + xfermodes
draws incorrectly as is, but will be fixed by https://codereview.chromium.org/1091173003
BUG=skia:3741
Review URL: https://codereview.chromium.org/1088773004
diff --git a/gm/imagefilters.cpp b/gm/imagefilters.cpp
new file mode 100644
index 0000000..c096c24
--- /dev/null
+++ b/gm/imagefilters.cpp
@@ -0,0 +1,67 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "gm.h"
+#include "SkImageFilter.h"
+#include "SkColorMatrixFilter.h"
+
+/**
+ * Test drawing a primitive w/ an imagefilter (in this case, just matrix w/ identity) to see
+ * that we apply the xfermode *after* the image has been created and filtered, and not during
+ * the creation step (i.e. before it is filtered).
+ *
+ * see skbug.com/3741
+ */
+class ImageFilterXfermodeTestGM : public skiagm::GM {
+protected:
+ SkString onShortName() override {
+ return SkString("imagefilters_xfermodes");
+ }
+
+ SkISize onISize() override { return SkISize::Make(480, 480); }
+
+ void doDraw(SkCanvas* canvas, SkXfermode::Mode mode, SkImageFilter* imf) {
+ SkPaint paint;
+ paint.setAntiAlias(true);
+
+ SkRect r0 = SkRect::MakeXYWH(10, 60, 200, 100);
+ SkRect r1 = SkRect::MakeXYWH(60, 10, 100, 200);
+
+ paint.setColor(SK_ColorRED);
+ canvas->drawOval(r0, paint);
+
+ paint.setColor(0x800000FF);
+ paint.setImageFilter(imf);
+ paint.setXfermodeMode(mode);
+ canvas->drawOval(r1, paint);
+ }
+
+ void onDraw(SkCanvas* canvas) override {
+ // just need an imagefilter to trigger the code-path (which creates a tmp layer)
+ SkAutoTUnref<SkImageFilter> imf(SkImageFilter::CreateMatrixFilter(SkMatrix::I(),
+ kNone_SkFilterQuality));
+
+ const SkXfermode::Mode modes[] = {
+ SkXfermode::kSrcATop_Mode, SkXfermode::kDstIn_Mode
+ };
+
+ for (size_t i = 0; i < SK_ARRAY_COUNT(modes); ++i) {
+ canvas->save();
+ this->doDraw(canvas, modes[i], NULL);
+ canvas->translate(250, 0);
+ this->doDraw(canvas, modes[i], imf);
+ canvas->restore();
+
+ canvas->translate(0, 250);
+ }
+ }
+
+private:
+ typedef GM INHERITED;
+};
+DEF_GM( return new ImageFilterXfermodeTestGM; )
+