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/*
* Copyright 2018 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 "SkShader.h"
#include "SkSurface.h"
#include "sk_tool_utils.h"
static sk_sp<SkImage> make_image(SkCanvas* rootCanvas) {
static constexpr SkScalar kSize = 50;
SkImageInfo info = SkImageInfo::MakeN32Premul(kSize, kSize);
auto surface = sk_tool_utils::makeSurface(rootCanvas, info);
SkPaint p;
p.setAntiAlias(true);
p.setColor(SK_ColorGREEN);
surface->getCanvas()->drawCircle(kSize / 2, kSize / 2, kSize / 2, p);
p.setStyle(SkPaint::kStroke_Style);
p.setColor(SK_ColorRED);
surface->getCanvas()->drawLine(kSize * .25f, kSize * .50f, kSize * .75f, kSize * .50f, p);
surface->getCanvas()->drawLine(kSize * .50f, kSize * .25f, kSize * .50f, kSize * .75f, p);
return surface->makeImageSnapshot();
}
DEF_SIMPLE_GM(localmatrixshader_nested, canvas, 450, 1200) {
auto image = make_image(canvas);
using FactoryT = sk_sp<SkShader> (*)(const sk_sp<SkImage>&,
const SkMatrix& inner,
const SkMatrix& outer);
static const FactoryT gFactories[] = {
// SkLocalMatrixShader(SkImageShader(inner), outer)
[](const sk_sp<SkImage>& img, const SkMatrix& inner, const SkMatrix& outer) {
return img->makeShader(&inner)->makeWithLocalMatrix(outer);
},
// SkLocalMatrixShader(SkLocalMatrixShader(SkImageShader(I), inner), outer)
[](const sk_sp<SkImage>& img, const SkMatrix& inner, const SkMatrix& outer) {
return img->makeShader()->makeWithLocalMatrix(inner)->makeWithLocalMatrix(outer);
},
// SkLocalMatrixShader(SkComposeShader(SkImageShader(inner)), outer)
[](const sk_sp<SkImage>& img, const SkMatrix& inner, const SkMatrix& outer) {
return SkShader::MakeCompose(SkShader::MakeColorShader(SK_ColorTRANSPARENT),
img->makeShader(&inner),
SkBlendMode::kSrcOver)
->makeWithLocalMatrix(outer);
},
// SkLocalMatrixShader(SkComposeShader(SkLocalMatrixShader(SkImageShader(I), inner)), outer)
[](const sk_sp<SkImage>& img, const SkMatrix& inner, const SkMatrix& outer) {
return SkShader::MakeCompose(SkShader::MakeColorShader(SK_ColorTRANSPARENT),
img->makeShader()->makeWithLocalMatrix(inner),
SkBlendMode::kSrcOver)
->makeWithLocalMatrix(outer);
},
};
static const auto inner = SkMatrix::MakeScale(2, 2),
outer = SkMatrix::MakeTrans(20, 20);
SkPaint border;
border.setAntiAlias(true);
border.setStyle(SkPaint::kStroke_Style);
auto rect = SkRect::Make(image->bounds());
SkAssertResult(SkMatrix::Concat(inner, outer).mapRect(&rect));
const auto drawColumn = [&]() {
SkAutoCanvasRestore acr(canvas, true);
for (const auto& f : gFactories) {
SkPaint p;
p.setShader(f(image, inner, outer));
canvas->drawRect(rect, p);
canvas->drawRect(rect, border);
canvas->translate(0, rect.height() * 1.5f);
}
};
drawColumn();
{
SkAutoCanvasRestore acr(canvas, true);
canvas->translate(0, rect.height() * SK_ARRAY_COUNT(gFactories) * 1.5f);
drawColumn();
}
canvas->translate(rect.width() * 1.5f, 0);
canvas->scale(2, 2);
drawColumn();
}
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