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skia2/gm/imagefiltersbase.cpp
Herb Derby c37b386886 Replace SK_ARRAY_COUNT with std::size() for skia/gm 
Note: in variedtext.cpp:66 changed static_assert to SkASSERT.

Change-Id: I853a2e5563c90c9dde5d6ba5443cc73b664b493d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/551876
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: John Stiles <johnstiles@google.com>
2022-06-21 18:09:30 +00:00

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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm/gm.h"
#include "include/core/SkBitmap.h"
#include "include/core/SkBlendMode.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkColorFilter.h"
#include "include/core/SkFlattenable.h"
#include "include/core/SkFont.h"
#include "include/core/SkImageFilter.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRSXform.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkTypeface.h"
#include "include/core/SkTypes.h"
#include "include/effects/SkImageFilters.h"
#include "include/utils/SkTextUtils.h"
#include "src/core/SkImageFilter_Base.h"
#include "src/core/SkSpecialImage.h"
#include "src/utils/SkPatchUtils.h"
#include "tools/ToolUtils.h"
#include <utility>
class SkReadBuffer;
class FailImageFilter : public SkImageFilter_Base {
public:
static sk_sp<SkImageFilter> Make() {
return sk_sp<SkImageFilter>(new FailImageFilter);
}
SK_FLATTENABLE_HOOKS(FailImageFilter)
protected:
FailImageFilter() : INHERITED(nullptr, 0, nullptr) {}
sk_sp<SkSpecialImage> onFilterImage(const Context&, SkIPoint* offset) const override {
return nullptr;
}
private:
using INHERITED = SkImageFilter_Base;
};
sk_sp<SkFlattenable> FailImageFilter::CreateProc(SkReadBuffer& buffer) {
SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 0);
return FailImageFilter::Make();
}
class IdentityImageFilter : public SkImageFilter_Base {
public:
static sk_sp<SkImageFilter> Make(sk_sp<SkImageFilter> input) {
return sk_sp<SkImageFilter>(new IdentityImageFilter(std::move(input)));
}
SK_FLATTENABLE_HOOKS(IdentityImageFilter)
protected:
sk_sp<SkSpecialImage> onFilterImage(const Context& ctx, SkIPoint* offset) const override {
offset->set(0, 0);
return sk_ref_sp<SkSpecialImage>(ctx.sourceImage());
}
private:
IdentityImageFilter(sk_sp<SkImageFilter> input) : INHERITED(&input, 1, nullptr) {}
using INHERITED = SkImageFilter_Base;
};
// Register these image filters as deserializable before main().
namespace {
static struct Initializer {
Initializer() {
SK_REGISTER_FLATTENABLE(IdentityImageFilter);
SK_REGISTER_FLATTENABLE(FailImageFilter);
}
} initializer;
} // namespace
sk_sp<SkFlattenable> IdentityImageFilter::CreateProc(SkReadBuffer& buffer) {
SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
return IdentityImageFilter::Make(common.getInput(0));
}
///////////////////////////////////////////////////////////////////////////////
static void draw_paint(SkCanvas* canvas, SkImage*, const SkRect& r, sk_sp<SkImageFilter> imf) {
SkPaint paint;
paint.setImageFilter(std::move(imf));
paint.setColor(SK_ColorGREEN);
canvas->save();
canvas->clipRect(r);
canvas->drawPaint(paint);
canvas->restore();
}
static void draw_line(SkCanvas* canvas, SkImage*, const SkRect& r, sk_sp<SkImageFilter> imf) {
SkPaint paint;
paint.setColor(SK_ColorBLUE);
paint.setImageFilter(imf);
paint.setStrokeWidth(r.width()/10);
canvas->drawLine(r.fLeft, r.fTop, r.fRight, r.fBottom, paint);
}
static void draw_rect(SkCanvas* canvas, SkImage*, const SkRect& r, sk_sp<SkImageFilter> imf) {
SkPaint paint;
paint.setColor(SK_ColorYELLOW);
paint.setImageFilter(imf);
SkRect rr(r);
rr.inset(r.width()/10, r.height()/10);
canvas->drawRect(rr, paint);
}
static void draw_path(SkCanvas* canvas, SkImage*, const SkRect& r, sk_sp<SkImageFilter> imf) {
SkPaint paint;
paint.setColor(SK_ColorMAGENTA);
paint.setImageFilter(imf);
paint.setAntiAlias(true);
canvas->drawCircle(r.centerX(), r.centerY(), r.width()*2/5, paint);
}
static void draw_text(SkCanvas* canvas, SkImage*, const SkRect& r, sk_sp<SkImageFilter> imf) {
SkPaint paint;
paint.setImageFilter(imf);
paint.setColor(SK_ColorCYAN);
SkFont font(ToolUtils::create_portable_typeface(), r.height() / 2);
SkTextUtils::DrawString(canvas, "Text", r.centerX(), r.centerY(), font, paint,
SkTextUtils::kCenter_Align);
}
static void draw_bitmap(SkCanvas* canvas, SkImage* i, const SkRect& r, sk_sp<SkImageFilter> imf) {
SkPaint paint;
paint.setImageFilter(std::move(imf));
SkIRect bounds;
r.roundOut(&bounds);
SkBitmap bm;
bm.allocN32Pixels(bounds.width(), bounds.height());
bm.eraseColor(SK_ColorTRANSPARENT);
SkCanvas c(bm);
draw_path(&c, i, r, nullptr);
canvas->drawImage(bm.asImage(), 0, 0, SkSamplingOptions(), &paint);
}
static void draw_patch(SkCanvas* canvas, SkImage*, const SkRect& r, sk_sp<SkImageFilter> imf) {
SkPaint paint;
paint.setImageFilter(std::move(imf));
// The order of the colors and points is clockwise starting at upper-left corner.
static constexpr SkPoint gCubics[SkPatchUtils::kNumCtrlPts] = {
//top points
{100,100},{150,50},{250,150},{300,100},
//right points
{250,150},{350,250},
//bottom points
{300,300},{250,250},{150,350},{100,300},
//left points
{50,250},{150,150}
};
static constexpr SkColor colors[SkPatchUtils::kNumCorners] = {
SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorCYAN
};
SkAutoCanvasRestore acr(canvas, /*doSave=*/true);
canvas->translate(-r.fLeft, -r.fTop);
canvas->scale(r.width() / 400.0, r.height() / 400.0);
canvas->drawPatch(gCubics, colors, /*texCoords=*/nullptr, SkBlendMode::kDst, paint);
}
static void draw_atlas(SkCanvas* canvas, SkImage* atlas, const SkRect& r,
sk_sp<SkImageFilter> imf) {
const SkScalar rad = SkDegreesToRadians(15.0f);
SkRSXform xform = SkRSXform::Make(SkScalarCos(rad), SkScalarSin(rad), r.width() * 0.15f, 0);
SkPaint paint;
paint.setImageFilter(std::move(imf));
paint.setAntiAlias(true);
SkSamplingOptions sampling(SkCubicResampler::Mitchell());
canvas->drawAtlas(atlas, &xform, &r, /*colors=*/nullptr, /*count=*/1, SkBlendMode::kSrc,
sampling, /*cullRect=*/nullptr, &paint);
}
///////////////////////////////////////////////////////////////////////////////
class ImageFiltersBaseGM : public skiagm::GM {
public:
ImageFiltersBaseGM () {}
protected:
SkString onShortName() override {
return SkString("imagefiltersbase");
}
SkISize onISize() override { return SkISize::Make(700, 500); }
void draw_frame(SkCanvas* canvas, const SkRect& r) {
SkPaint paint;
paint.setStyle(SkPaint::kStroke_Style);
paint.setColor(SK_ColorRED);
canvas->drawRect(r, paint);
}
void onDraw(SkCanvas* canvas) override {
if (fAtlas == nullptr) {
fAtlas = create_atlas_image(canvas);
}
void (*drawProc[])(SkCanvas*, SkImage*, const SkRect&, sk_sp<SkImageFilter>) = {
draw_paint,
draw_line, draw_rect, draw_path, draw_text,
draw_bitmap, draw_patch, draw_atlas
};
auto cf = SkColorFilters::Blend(SK_ColorRED, SkBlendMode::kSrcIn);
sk_sp<SkImageFilter> filters[] = {
nullptr,
IdentityImageFilter::Make(nullptr),
FailImageFilter::Make(),
SkImageFilters::ColorFilter(std::move(cf), nullptr),
// The strange 0.29 value tickles an edge case where crop rect calculates
// a small border, but the blur really needs no border. This tickles
// an msan uninitialized value bug.
SkImageFilters::Blur(12.0f, 0.29f, nullptr),
SkImageFilters::DropShadow(10.0f, 5.0f, 3.0f, 3.0f, SK_ColorBLUE, nullptr),
};
SkRect r = SkRect::MakeWH(SkIntToScalar(64), SkIntToScalar(64));
SkScalar MARGIN = SkIntToScalar(16);
SkScalar DX = r.width() + MARGIN;
SkScalar DY = r.height() + MARGIN;
canvas->translate(MARGIN, MARGIN);
for (size_t i = 0; i < std::size(drawProc); ++i) {
canvas->save();
for (size_t j = 0; j < std::size(filters); ++j) {
drawProc[i](canvas, fAtlas.get(), r, filters[j]);
draw_frame(canvas, r);
canvas->translate(0, DY);
}
canvas->restore();
canvas->translate(DX, 0);
}
}
private:
static sk_sp<SkImage> create_atlas_image(SkCanvas* canvas) {
static constexpr SkSize kSize = {64, 64};
SkImageInfo atlasInfo = SkImageInfo::MakeN32Premul(kSize.fWidth, kSize.fHeight);
sk_sp<SkSurface> atlasSurface(ToolUtils::makeSurface(canvas, atlasInfo));
SkCanvas* atlasCanvas = atlasSurface->getCanvas();
SkPaint atlasPaint;
atlasPaint.setColor(SK_ColorGRAY);
SkFont font(ToolUtils::create_portable_typeface(), kSize.fHeight * 0.4f);
SkTextUtils::DrawString(atlasCanvas, "Atlas", kSize.fWidth * 0.5f, kSize.fHeight * 0.5f,
font, atlasPaint, SkTextUtils::kCenter_Align);
return atlasSurface->makeImageSnapshot();
}
sk_sp<SkImage> fAtlas;
using INHERITED = GM;
};
DEF_GM( return new ImageFiltersBaseGM; )
///////////////////////////////////////////////////////////////////////////////
/*
* Want to test combos of filter and LCD text, to be sure we disable LCD in the presence of
* a filter.
*/
class ImageFiltersTextBaseGM : public skiagm::GM {
SkString fSuffix;
public:
ImageFiltersTextBaseGM(const char suffix[]) : fSuffix(suffix) {}
protected:
SkString onShortName() override {
SkString name;
name.printf("%s_%s", "textfilter", fSuffix.c_str());
return name;
}
SkISize onISize() override { return SkISize::Make(512, 342); }
void drawWaterfall(SkCanvas* canvas, const SkPaint& paint) {
static const SkFont::Edging kEdgings[3] = {
SkFont::Edging::kAlias,
SkFont::Edging::kAntiAlias,
SkFont::Edging::kSubpixelAntiAlias,
};
SkFont font(ToolUtils::create_portable_typeface(), 30);
SkAutoCanvasRestore acr(canvas, true);
for (SkFont::Edging edging : kEdgings) {
font.setEdging(edging);
canvas->drawString("Hamburgefon", 0, 0, font, paint);
canvas->translate(0, 40);
}
}
virtual void installFilter(SkPaint* paint) = 0;
void onDraw(SkCanvas* canvas) override {
canvas->translate(20, 40);
for (int doSaveLayer = 0; doSaveLayer <= 1; ++doSaveLayer) {
SkAutoCanvasRestore acr(canvas, true);
for (int useFilter = 0; useFilter <= 1; ++useFilter) {
SkAutoCanvasRestore acr2(canvas, true);
SkPaint paint;
if (useFilter) {
this->installFilter(&paint);
}
if (doSaveLayer) {
canvas->saveLayer(nullptr, &paint);
paint.setImageFilter(nullptr);
}
this->drawWaterfall(canvas, paint);
acr2.restore();
canvas->translate(250, 0);
}
acr.restore();
canvas->translate(0, 200);
}
}
private:
using INHERITED = GM;
};
class ImageFiltersText_IF : public ImageFiltersTextBaseGM {
public:
ImageFiltersText_IF() : ImageFiltersTextBaseGM("image") {}
void installFilter(SkPaint* paint) override {
paint->setImageFilter(SkImageFilters::Blur(1.5f, 1.5f, nullptr));
}
};
DEF_GM( return new ImageFiltersText_IF; )
class ImageFiltersText_CF : public ImageFiltersTextBaseGM {
public:
ImageFiltersText_CF() : ImageFiltersTextBaseGM("color") {}
void installFilter(SkPaint* paint) override {
paint->setColorFilter(SkColorFilters::Blend(SK_ColorBLUE, SkBlendMode::kSrcIn));
}
};
DEF_GM( return new ImageFiltersText_CF; )
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