Add a new GM to show problems with shear/rotate CTM w/ image filters.
Review URL: https://codereview.chromium.org/1028663002
diff --git a/gm/imagefilterstransformed.cpp b/gm/imagefilterstransformed.cpp
new file mode 100644
index 0000000..3bac0e5
--- /dev/null
+++ b/gm/imagefilterstransformed.cpp
@@ -0,0 +1,124 @@
+/*
+ * 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 "sk_tool_utils.h"
+#include "SkBitmapSource.h"
+#include "SkBlurImageFilter.h"
+#include "SkColor.h"
+#include "SkDisplacementMapEffect.h"
+#include "SkDropShadowImageFilter.h"
+#include "SkGradientShader.h"
+#include "SkMorphologyImageFilter.h"
+#include "SkScalar.h"
+#include "gm.h"
+
+namespace skiagm {
+
+// This GM draws image filters with a CTM containing shearing / rotation.
+// It checks that the scale portion of the CTM is correctly extracted
+// and applied to the image inputs separately from the non-scale portion.
+
+class ImageFiltersTransformedGM : public GM {
+public:
+ ImageFiltersTransformedGM() {
+ this->setBGColor(SK_ColorBLACK);
+ }
+
+protected:
+
+ SkString onShortName() SK_OVERRIDE { return SkString("imagefilterstransformed"); }
+
+ SkISize onISize() SK_OVERRIDE { return SkISize::Make(420, 240); }
+
+ void makeGradientCircle(int width, int height) {
+ SkScalar x = SkIntToScalar(width / 2);
+ SkScalar y = SkIntToScalar(height / 2);
+ SkScalar radius = SkMinScalar(x, y) * 0.8f;
+ fGradientCircle.allocN32Pixels(width, height);
+ SkCanvas canvas(fGradientCircle);
+ canvas.clear(0x00000000);
+ SkColor colors[2];
+ colors[0] = SK_ColorWHITE;
+ colors[1] = SK_ColorBLACK;
+ SkAutoTUnref<SkShader> shader(
+ SkGradientShader::CreateRadial(SkPoint::Make(x, y), radius, colors, NULL, 2,
+ SkShader::kClamp_TileMode)
+ );
+ SkPaint paint;
+ paint.setShader(shader);
+ canvas.drawCircle(x, y, radius, paint);
+ }
+
+ void onOnceBeforeDraw() SK_OVERRIDE {
+ fCheckerboard.allocN32Pixels(64, 64);
+ SkCanvas checkerboardCanvas(fCheckerboard);
+ sk_tool_utils::draw_checkerboard(&checkerboardCanvas, 0xFFA0A0A0, 0xFF404040, 8);
+
+ this->makeGradientCircle(64, 64);
+ }
+
+ void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+ SkAutoTUnref<SkImageFilter> gradient(SkBitmapSource::Create(fGradientCircle));
+ SkAutoTUnref<SkImageFilter> checkerboard(SkBitmapSource::Create(fCheckerboard));
+ SkImageFilter* filters[] = {
+ SkBlurImageFilter::Create(12, 0),
+ SkDropShadowImageFilter::Create(0, 15, 8, 0, SK_ColorGREEN,
+ SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode),
+ SkDisplacementMapEffect::Create(SkDisplacementMapEffect::kR_ChannelSelectorType,
+ SkDisplacementMapEffect::kR_ChannelSelectorType,
+ 12,
+ gradient.get(),
+ checkerboard.get()),
+ SkDilateImageFilter::Create(2, 2, checkerboard.get()),
+ SkErodeImageFilter::Create(2, 2, checkerboard.get()),
+ };
+
+ const SkScalar margin = SkIntToScalar(20);
+ const SkScalar size = SkIntToScalar(60);
+
+ for (size_t j = 0; j < 3; j++) {
+ canvas->save();
+ canvas->translate(margin, 0);
+ for (size_t i = 0; i < SK_ARRAY_COUNT(filters); ++i) {
+ SkPaint paint;
+ paint.setColor(SK_ColorWHITE);
+ paint.setImageFilter(filters[i]);
+ paint.setAntiAlias(true);
+ canvas->save();
+ canvas->translate(size * SK_ScalarHalf, size * SK_ScalarHalf);
+ canvas->scale(SkDoubleToScalar(0.8), SkDoubleToScalar(0.8));
+ if (j == 1) {
+ canvas->rotate(SkIntToScalar(45));
+ } else if (j == 2) {
+ canvas->skew(SkDoubleToScalar(0.5), SkDoubleToScalar(0.2));
+ }
+ canvas->translate(-size * SK_ScalarHalf, -size * SK_ScalarHalf);
+ canvas->drawOval(SkRect::MakeXYWH(0, size * SkDoubleToScalar(0.1),
+ size, size * SkDoubleToScalar(0.6)), paint);
+ canvas->restore();
+ canvas->translate(size + margin, 0);
+ }
+ canvas->restore();
+ canvas->translate(0, size + margin);
+ }
+
+ for (size_t i = 0; i < SK_ARRAY_COUNT(filters); ++i) {
+ SkSafeUnref(filters[i]);
+ }
+ }
+
+private:
+ SkBitmap fCheckerboard;
+ SkBitmap fGradientCircle;
+ typedef GM INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+DEF_GM( return new ImageFiltersTransformedGM; )
+
+}
diff --git a/gyp/gmslides.gypi b/gyp/gmslides.gypi
index 6ebfe30..fdcac44 100644
--- a/gyp/gmslides.gypi
+++ b/gyp/gmslides.gypi
@@ -128,6 +128,7 @@
'../gm/imagefilterscropexpand.cpp',
'../gm/imagefiltersgraph.cpp',
'../gm/imagefiltersscaled.cpp',
+ '../gm/imagefilterstransformed.cpp',
'../gm/internal_links.cpp',
'../gm/lcdtext.cpp',
'../gm/linepaths.cpp',
