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Unified Diff: gm/imagemakewithfilter.cpp

Issue 1964043002: Image filters: implement SkImage::makeWithFilter(). (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: Fixes per Rob's comments Created 4 years, 7 months ago
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Index: gm/imagemakewithfilter.cpp
diff --git a/gm/imagemakewithfilter.cpp b/gm/imagemakewithfilter.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..15439f0c15c707ae2229d8886cc5e03280c30642
--- /dev/null
+++ b/gm/imagemakewithfilter.cpp
@@ -0,0 +1,103 @@
+/*
+ * Copyright 2016 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 "SkBlurImageFilter.h"
+#include "SkCanvas.h"
+#include "SkColorFilter.h"
+#include "SkColorFilterImageFilter.h"
+#include "SkDropShadowImageFilter.h"
+#include "SkSurface.h"
+
+///////////////////////////////////////////////////////////////////////////////
+
+static void show_bounds(SkCanvas* canvas, const SkIRect& subset, const SkIRect& clip) {
+ SkIRect rects[] { subset, clip };
+ SkColor colors[] { SK_ColorRED, SK_ColorBLUE };
+
+ SkPaint paint;
+ paint.setStyle(SkPaint::kStroke_Style);
+
+ for (size_t i = 0; i < SK_ARRAY_COUNT(rects); ++i) {
+ paint.setColor(colors[i]);
+ canvas->drawRect(SkRect::Make(rects[i]), paint);
+ }
+}
+
+// In this GM, we're going to feed the inner portion of a 100x100 checkboard
+// (i.e., strip off a 25-wide border) through the makeWithFilter method.
+// We'll then draw the appropriate subset of the result to the screen at the
+// given offset.
+class ImageMakeWithFilterGM : public skiagm::GM {
+public:
+ ImageMakeWithFilterGM () {}
+
+protected:
+ SkString onShortName() override {
+ return SkString("imagemakewithfilter");
+ }
+
+ SkISize onISize() override { return SkISize::Make(320, 100); }
+
+ void onDraw(SkCanvas* canvas) override {
+ auto cf = SkColorFilter::MakeModeFilter(SK_ColorGREEN, SkXfermode::kSrc_Mode);
+ sk_sp<SkImageFilter> filters[] = {
+ SkColorFilterImageFilter::Make(std::move(cf), nullptr),
+ SkBlurImageFilter::Make(2.0f, 2.0f, nullptr),
+ SkDropShadowImageFilter::Make(
+ 10.0f, 5.0f, 3.0f, 3.0f, SK_ColorBLUE,
+ SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode,
+ nullptr),
+ };
+
+ SkIRect clipBounds[] {
+ { -20, -20, 100, 100 },
+ { 0, 0, 75, 75 },
+ { 20, 20, 100, 100 },
+ { -20, -20, 50, 50 },
+ { 20, 20, 50, 50 },
+ };
+
+ SkImageInfo info = SkImageInfo::MakeN32(100, 100, kPremul_SkAlphaType);
+ SkScalar MARGIN = SkIntToScalar(40);
+ SkScalar DX = info.width() + MARGIN;
+ SkScalar DY = info.height() + MARGIN;
+
+ canvas->translate(MARGIN, MARGIN);
+
+ sk_sp<SkSurface> surface = canvas->makeSurface(info);
+ if (!surface) {
+ surface = SkSurface::MakeRaster(info);
+ }
+ sk_tool_utils::draw_checkerboard(surface->getCanvas());
+ sk_sp<SkImage> source = surface->makeImageSnapshot();
+
+ for (auto clipBound : clipBounds) {
+ canvas->save();
+ for (size_t i = 0; i < SK_ARRAY_COUNT(filters); ++i) {
+ SkIRect subset = SkIRect::MakeXYWH(25, 25, 50, 50);
+ SkIRect outSubset;
+ SkIPoint offset;
+ sk_sp<SkImage> result = source->makeWithFilter(filters[i].get(), subset, clipBound,
+ &outSubset, &offset);
+ SkASSERT(result);
+ SkASSERT(source->isTextureBacked() == result->isTextureBacked());
+ result = result->makeSubset(outSubset);
+ canvas->drawImage(result.get(), SkIntToScalar(offset.fX), SkIntToScalar(offset.fY));
+ show_bounds(canvas, SkIRect::MakeXYWH(offset.x(), offset.y(), outSubset.width(),
+ outSubset.height()), clipBound);
+ canvas->translate(DX, 0);
+ }
+ canvas->restore();
+ canvas->translate(0, DY);
+ }
+ }
+
+private:
+ typedef GM INHERITED;
+};
+DEF_GM( return new ImageMakeWithFilterGM; )
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