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/*
* Copyright 2013 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 "SkCanvas.h"
#include "SkBlurImageFilter.h"
#include "SkRSXform.h"
#include "SkSurface.h"
static void make_bm(SkBitmap* bm) {
bm->allocN32Pixels(100, 100);
bm->eraseColor(SK_ColorBLUE);
SkCanvas canvas(*bm);
SkPaint paint;
paint.setAntiAlias(true);
paint.setColor(SK_ColorRED);
canvas.drawCircle(50, 50, 50, paint);
}
static void draw_1_bitmap(SkCanvas* canvas, const SkBitmap& bm, bool doClip,
int dx, int dy, SkImageFilter* filter = nullptr) {
SkAutoCanvasRestore acr(canvas, true);
SkPaint paint;
SkRect clipR = SkRect::MakeXYWH(SkIntToScalar(dx),
SkIntToScalar(dy),
SkIntToScalar(bm.width()),
SkIntToScalar(bm.height()));
paint.setImageFilter(filter);
clipR.inset(5, 5);
canvas->translate(SkIntToScalar(bm.width() + 20), 0);
if (doClip) {
canvas->save();
canvas->clipRect(clipR);
}
canvas->drawBitmap(bm, SkIntToScalar(dx), SkIntToScalar(dy), &paint);
if (doClip) {
canvas->restore();
}
}
/**
* Compare output of drawSprite and drawBitmap (esp. clipping and imagefilters)
*/
class SpriteBitmapGM : public skiagm::GM {
public:
SpriteBitmapGM() {}
protected:
SkString onShortName() override {
return SkString("spritebitmap");
}
SkISize onISize() override {
return SkISize::Make(640, 480);
}
void onDraw(SkCanvas* canvas) override {
SkBitmap bm;
make_bm(&bm);
int dx = 10;
int dy = 10;
SkScalar sigma = 8;
SkAutoTUnref<SkImageFilter> filter(SkBlurImageFilter::Create(sigma, sigma));
draw_1_bitmap(canvas, bm, false, dx, dy);
dy += bm.height() + 20;
draw_1_bitmap(canvas, bm, false, dx, dy, filter);
dy += bm.height() + 20;
draw_1_bitmap(canvas, bm, true, dx, dy);
dy += bm.height() + 20;
draw_1_bitmap(canvas, bm, true, dx, dy, filter);
}
private:
typedef GM INHERITED;
};
DEF_GM( return new SpriteBitmapGM; )
///////////////////////////////////////////////////////////////////////////////////////////////////
#include "SkColorFilterImageFilter.h"
#include "SkModeColorFilter.h"
#include "SkMorphologyImageFilter.h"
#include "SkOffsetImageFilter.h"
static SkImage* make_image(SkCanvas* rootCanvas) {
SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100);
SkAutoTUnref<SkSurface> surface(rootCanvas->newSurface(info));
if (!surface) {
surface.reset(SkSurface::NewRaster(info));
}
SkPaint paint;
paint.setAntiAlias(true);
paint.setColor(SK_ColorRED);
surface->getCanvas()->drawCircle(50, 50, 50, paint);
return surface->newImageSnapshot();
}
static void show_image(SkCanvas* canvas, SkImage* image, const SkIPoint& offset) {
SkScalar x = SkIntToScalar(offset.x());
SkScalar y = SkIntToScalar(offset.y());
SkPaint paint;
paint.setStyle(SkPaint::kStroke_Style);
SkRect r = SkRect::MakeIWH(image->width(), image->height());
r.offset(x, y);
// get on pixel-centers to make the hairline land on a numerical stable boundary
r.outset(SK_ScalarHalf, SK_ScalarHalf);
canvas->drawRect(r, paint);
canvas->drawImage(image, x, y, nullptr);
}
typedef SkImageFilter* (*ImageFilterFactory)();
// +[]{...} did not work on windows (VS)
// (ImageFilterFactory)[]{...} did not work on linux (gcc)
// hence this cast function
template <typename T> ImageFilterFactory IFCCast(T arg) { return arg; }
// We expect that applying the filter will keep us in the same domain (raster or gpu)
static void check_same_domain(SkImage* a, SkImage* b) {
SkASSERT(a->isTextureBacked() == b->isTextureBacked());
}
/**
* Compare output of drawSprite and drawBitmap (esp. clipping and imagefilters)
*/
class ApplyFilterGM : public skiagm::GM {
public:
ApplyFilterGM() {}
protected:
SkString onShortName() override {
return SkString("apply-filter");
}
SkISize onISize() override {
return SkISize::Make(780, 780);
}
void onDraw(SkCanvas* canvas) override {
SkAutoTUnref<SkImage> image0(make_image(canvas));
const ImageFilterFactory factories[] = {
IFCCast([]{ return SkBlurImageFilter::Create(8, 8); }),
IFCCast([]{ SkAutoTUnref<SkColorFilter> cf(SkModeColorFilter::Create(SK_ColorBLUE,
SkXfermode::kSrcIn_Mode));
return SkColorFilterImageFilter::Create(cf);
}),
IFCCast([]{ return SkDilateImageFilter::Create(8, 8); }),
IFCCast([]{ return SkErodeImageFilter::Create(8, 8); }),
IFCCast([]{ return SkOffsetImageFilter::Create(8, 8); }),
};
const SkScalar spacer = image0->width() * 3.0f / 2;
for (auto&& factory : factories) {
SkAutoTUnref<SkImageFilter> filter(factory());
SkIPoint offset1, offset2;
SkAutoTUnref<SkImage> image1(image0->applyFilter(filter, &offset1, true));
SkAutoTUnref<SkImage> image2(image0->applyFilter(filter, &offset2, false));
check_same_domain(image0, image1);
check_same_domain(image0, image2);
canvas->save();
canvas->translate(30, 30);
show_image(canvas, image0, SkIPoint::Make(0, 0)); // original
canvas->translate(spacer, 0);
show_image(canvas, image1, offset1); // snug
canvas->translate(spacer, 0);
show_image(canvas, image2, offset2); // not snug
canvas->restore();
canvas->translate(0, spacer);
}
}
private:
typedef GM INHERITED;
};
DEF_GM( return new ApplyFilterGM; )
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