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Diffstat (limited to 'gm/imagemakewithfilter.cpp')
-rw-r--r-- | gm/imagemakewithfilter.cpp | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/gm/imagemakewithfilter.cpp b/gm/imagemakewithfilter.cpp new file mode 100644 index 0000000000..15439f0c15 --- /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; ) |