Add GM to test the IgnoreTransform flag on blurs

Bug: skia:
Change-Id: I2525daa83d78280e4be3b31b66dc4f13971af311
Reviewed-on: https://skia-review.googlesource.com/18066
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>

1 files changed, 148 insertions, 0 deletions

diff --git a/gm/blurignorexform.cpp b/gm/blurignorexform.cpp
new file mode 100644
index 0000000000..8db56ab8d7
--- /dev/null
+++ b/gm/blurignorexform.cpp
@@ -0,0 +1,148 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * Use of this source code is governed by a BD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "gm.h"
+#include "sk_tool_utils.h"
+
+#include "SkBlurMask.h"
+#include "SkBlurMaskFilter.h"
+#include "SkCanvas.h"
+#include "SkPaint.h"
+
+// This GM tests out the SkBlurMaskFilter's kIgnoreTransform flag. That flag causes the blur mask
+// filter to not apply the CTM to the blur's radius.
+class BlurIgnoreXformGM : public skiagm::GM {
+public:
+    enum class DrawType {
+        kCircle,
+        kRect,
+        kRRect,
+    };
+
+    BlurIgnoreXformGM(DrawType drawType) : fDrawType(drawType) { }
+
+protected:
+    bool runAsBench() const override { return true; }
+
+    SkString onShortName() override {
+        SkString name;
+        name.printf("blur_ignore_xform_%s",
+                    DrawType::kCircle == fDrawType ? "circle"
+                        : DrawType::kRect == fDrawType ? "rect" : "rrect");
+        return name;
+    }
+
+    SkISize onISize() override {
+        return SkISize::Make(375, 475);
+    }
+
+    void onOnceBeforeDraw() override {
+        for (int i = 0; i < kNumBlurs; ++i) {
+            fBlurFilters[i] = SkBlurMaskFilter::Make(
+                                    kNormal_SkBlurStyle,
+                                    SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(20)),
+                                    SkBlurMaskFilter::kHighQuality_BlurFlag | kBlurFlags[i].fFlags);
+        }
+    }
+
+    void onDraw(SkCanvas* canvas) override {
+        SkPaint paint;
+        paint.setColor(SK_ColorBLACK);
+        paint.setAntiAlias(true);
+
+        canvas->translate(10, 25);
+        canvas->save();
+        canvas->translate(80, 0);
+        for (size_t i = 0; i < kNumBlurs; ++i) {
+            SkAutoCanvasRestore autoRestore(canvas, true);
+            canvas->translate(SkIntToScalar(i * 150), 0);
+            for (auto scale : kMatrixScales) {
+                canvas->save();
+                canvas->scale(scale.fScale, scale.fScale);
+                static const SkScalar kRadius = 20.0f;
+                SkScalar coord = 50.0f * 1.0f / scale.fScale;
+                SkRect rect = SkRect::MakeXYWH(coord - kRadius , coord - kRadius,
+                                               2 * kRadius, 2 * kRadius);
+                SkRRect rrect = SkRRect::MakeRectXY(rect, kRadius/2.0f, kRadius/2.0f);
+
+                paint.setMaskFilter(fBlurFilters[i]);
+                for (int j = 0; j < 2; ++j) {
+                    canvas->save();
+                    canvas->translate(10 * (1 - j), 10 * (1 - j));
+                    if (DrawType::kCircle == fDrawType) {
+                        canvas->drawCircle(coord, coord, kRadius, paint);
+                    } else if (DrawType::kRect == fDrawType) {
+                        canvas->drawRect(rect, paint);
+                    } else {
+                        canvas->drawRRect(rrect, paint);
+                    }
+                    paint.setMaskFilter(nullptr);
+                    canvas->restore();
+                }
+                canvas->restore();
+                canvas->translate(0, SkIntToScalar(150));
+            }
+        }
+        canvas->restore();
+        if (kBench_Mode != this->getMode()) {
+            this->drawOverlay(canvas);
+        }
+    }
+
+    void drawOverlay(SkCanvas* canvas) {
+        canvas->translate(10, 0);
+        SkPaint textPaint;
+        sk_tool_utils::set_portable_typeface(&textPaint);
+        textPaint.setAntiAlias(true);
+        canvas->save();
+        for (int i = 0; i < kNumBlurs; ++i) {
+            canvas->drawString(kBlurFlags[i].fName, 100, 0, textPaint);
+            canvas->translate(SkIntToScalar(130), 0);
+        }
+        canvas->restore();
+        for (auto scale : kMatrixScales) {
+            canvas->drawString(scale.fName, 0, 50, textPaint);
+            canvas->translate(0, SkIntToScalar(150));
+        }
+    }
+
+private:
+    static constexpr int kNumBlurs = 2;
+
+    static const struct BlurFlags {
+        uint32_t fFlags;
+        const char* fName;
+    } kBlurFlags[kNumBlurs];
+
+    static const struct MatrixScale {
+        float fScale;
+        const char* fName;
+    } kMatrixScales[3];
+
+    DrawType fDrawType;
+    sk_sp<SkMaskFilter> fBlurFilters[kNumBlurs];
+
+    typedef         skiagm::GM INHERITED;
+};
+
+const BlurIgnoreXformGM::BlurFlags BlurIgnoreXformGM::kBlurFlags[] = {
+    {0, "none"},
+    {SkBlurMaskFilter::kIgnoreTransform_BlurFlag, "IgnoreTransform"}
+};
+
+const BlurIgnoreXformGM::MatrixScale BlurIgnoreXformGM::kMatrixScales[] = {
+    {1.0f, "Identity"},
+    {0.5f, "Scale = 0.5"},
+    {2.0f, "Scale = 2.0"}
+};
+
+DEF_GM(return new BlurIgnoreXformGM(BlurIgnoreXformGM::DrawType::kCircle);)
+DEF_GM(return new BlurIgnoreXformGM(BlurIgnoreXformGM::DrawType::kRect);)
+DEF_GM(return new BlurIgnoreXformGM(BlurIgnoreXformGM::DrawType::kRRect);)
+
+
+