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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 "SkAlphaThresholdFilter.h"
#include "SkImageSource.h"
#include "SkOffsetImageFilter.h"
#include "SkRandom.h"
#include "SkRegion.h"
#include "SkSurface.h"
#include "sk_tool_utils.h"
#define WIDTH 500
#define HEIGHT 500
static void draw_rects(SkCanvas* canvas) {
SkPaint rectPaint;
rectPaint.setColor(SK_ColorBLUE);
canvas->drawRect(SkRect::MakeXYWH(0, 0, WIDTH / 2, HEIGHT / 2), rectPaint);
rectPaint.setColor(0xBFFF0000);
canvas->drawRect(SkRect::MakeXYWH(WIDTH / 2, 0, WIDTH / 2, HEIGHT / 2), rectPaint);
rectPaint.setColor(0x3F00FF00);
canvas->drawRect(SkRect::MakeXYWH(0, HEIGHT / 2, WIDTH / 2, HEIGHT / 2), rectPaint);
rectPaint.setColor(SK_ColorTRANSPARENT);
canvas->drawRect(SkRect::MakeXYWH(WIDTH / 2, HEIGHT / 2, WIDTH / 2, HEIGHT / 2), rectPaint);
}
static SkPaint create_filter_paint(SkImageFilter::CropRect* cropRect = nullptr) {
SkIRect rects[2];
rects[0] = SkIRect::MakeXYWH(0, 150, WIDTH, HEIGHT - 300);
rects[1] = SkIRect::MakeXYWH(150, 0, WIDTH - 300, HEIGHT);
SkRegion region;
region.setRects(rects, 2);
SkPaint paint;
sk_sp<SkImageFilter> offset(SkOffsetImageFilter::Make(25, 25, nullptr));
paint.setImageFilter(SkAlphaThresholdFilter::Make(region, 0.2f, 0.7f, std::move(offset), cropRect));
return paint;
}
class ImageAlphaThresholdGM : public skiagm::GM {
public:
ImageAlphaThresholdGM(bool useCropRect) : fUseCropRect(useCropRect) {
this->setBGColor(SK_ColorWHITE);
}
protected:
SkString onShortName() override {
if (fUseCropRect) {
return SkString("imagealphathreshold_crop");
}
return SkString("imagealphathreshold");
}
SkISize onISize() override {
return SkISize::Make(WIDTH, HEIGHT);
}
void onDraw(SkCanvas* canvas) override {
SkMatrix matrix;
matrix.reset();
matrix.setTranslate(WIDTH * .1f, HEIGHT * .1f);
matrix.postScale(.8f, .8f);
canvas->concat(matrix);
SkRect r = SkRect::MakeLTRB(100, 100, WIDTH - 100, HEIGHT - 100);
SkImageFilter::CropRect cropRect(r);
SkPaint paint = create_filter_paint(fUseCropRect ? &cropRect : nullptr);
canvas->saveLayer(nullptr, &paint);
draw_rects(canvas);
canvas->restore();
}
private:
bool fUseCropRect;
typedef GM INHERITED;
};
// Create a 'width' x 'height' SkSurface that matches the colorType of 'canvas' as
// best we can
static sk_sp<SkSurface> make_color_matching_surface(SkCanvas* canvas, int width, int height,
SkAlphaType at) {
SkColorType ct = canvas->imageInfo().colorType();
sk_sp<SkColorSpace> cs(canvas->imageInfo().refColorSpace());
if (kUnknown_SkColorType == ct) {
// For backends that aren't yet color-space aware we just fallback to N32.
ct = kN32_SkColorType;
cs = nullptr;
} else if (SkColorTypeIsAlwaysOpaque(ct)) {
at = kOpaque_SkAlphaType;
}
SkImageInfo info = SkImageInfo::Make(width, height, ct, at, std::move(cs));
return sk_tool_utils::makeSurface(canvas, info);
}
class ImageAlphaThresholdSurfaceGM : public skiagm::GM {
public:
ImageAlphaThresholdSurfaceGM() {
this->setBGColor(0xFFFFFFFF);
}
protected:
SkString onShortName() override {
return SkString("imagealphathreshold_surface");
}
SkISize onISize() override {
return SkISize::Make(WIDTH, HEIGHT);
}
void onDraw(SkCanvas* canvas) override {
SkMatrix matrix;
matrix.reset();
matrix.setTranslate(WIDTH * .1f, HEIGHT * .1f);
matrix.postScale(.8f, .8f);
canvas->concat(matrix);
sk_sp<SkSurface> surface(make_color_matching_surface(canvas, WIDTH, HEIGHT,
kPremul_SkAlphaType));
if (!surface) {
return;
}
surface->getCanvas()->clear(SK_ColorTRANSPARENT);
draw_rects(surface->getCanvas());
SkPaint paint = create_filter_paint();
canvas->clipRect(SkRect::MakeLTRB(100, 100, WIDTH - 100, HEIGHT - 100));
canvas->drawImage(surface->makeImageSnapshot().get(), 0, 0, &paint);
}
private:
typedef skiagm::GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new ImageAlphaThresholdGM(true);)
DEF_GM(return new ImageAlphaThresholdGM(false);)
DEF_GM(return new ImageAlphaThresholdSurfaceGM();)
//////////////////////////////////////////////////////////////////////////////
static sk_sp<SkImage> make_img() {
SkBitmap bitmap;
bitmap.allocPixels(SkImageInfo::MakeS32(WIDTH, HEIGHT, kPremul_SkAlphaType));
SkCanvas canvas(bitmap);
SkPaint paint;
SkRect rect = SkRect::MakeWH(WIDTH, HEIGHT);
SkRandom rnd;
while (!rect.isEmpty()) {
paint.setColor(rnd.nextU() | (0xFF << 24));
canvas.drawRect(rect, paint);
rect.inset(25, 25);
}
return SkImage::MakeFromBitmap(bitmap);
}
DEF_SIMPLE_GM_BG(imagealphathreshold_image, canvas, WIDTH * 2, HEIGHT, SK_ColorBLACK) {
sk_sp<SkImage> image(make_img());
SkIRect rects[2];
rects[0] = SkIRect::MakeXYWH(0, 150, WIDTH, HEIGHT - 300);
rects[1] = SkIRect::MakeXYWH(150, 0, WIDTH - 300, HEIGHT);
SkRegion region;
region.setRects(rects, 2);
SkPaint filterPaint;
sk_sp<SkImageFilter> imageSource(SkImageSource::Make(image));
filterPaint.setImageFilter(SkAlphaThresholdFilter::Make(region, 0.2f, 0.7f,
std::move(imageSource)));
canvas->saveLayer(nullptr, &filterPaint);
canvas->restore();
canvas->translate(WIDTH, 0);
canvas->drawImage(image, 0, 0);
}
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