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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 "sk_tool_utils.h"
#include "SkBlurMaskFilter.h"
#include "SkCanvas.h"
#include "SkImage.h"
#include "SkShaderMaskFilter.h"
static void draw_masked_image(SkCanvas* canvas, const SkImage* image, SkScalar x, SkScalar y,
const SkImage* mask, sk_sp<SkMaskFilter> outer = nullptr) {
SkMatrix matrix = SkMatrix::MakeScale(SkIntToScalar(image->width()) / mask->width(),
SkIntToScalar(image->height() / mask->height()));
SkPaint paint;
auto mf = SkShaderMaskFilter::Make(mask->makeShader(&matrix));
if (outer) {
mf = SkMaskFilter::MakeCompose(outer, mf);
}
paint.setMaskFilter(mf);
canvas->drawImage(image, x, y, &paint);
}
#include "SkGradientShader.h"
static sk_sp<SkShader> make_shader(const SkRect& r) {
const SkPoint pts[] = {
{ r.fLeft, r.fTop }, { r.fRight, r.fBottom },
};
const SkColor colors[] = { 0, SK_ColorWHITE };
return SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kRepeat_TileMode);
}
DEF_SIMPLE_GM(shadermaskfilter_gradient, canvas, 512, 512) {
SkRect r = { 0, 0, 100, 150 };
auto shader = make_shader(r);
auto mf = SkShaderMaskFilter::Make(shader);
canvas->translate(20, 20);
canvas->scale(2, 2);
SkPaint paint;
paint.setMaskFilter(mf);
paint.setColor(SK_ColorRED);
canvas->drawOval(r, paint);
}
#include "Resources.h"
DEF_SIMPLE_GM(shadermaskfilter_image, canvas, 512, 512) {
canvas->scale(1.25f, 1.25f);
auto image = GetResourceAsImage("images/mandrill_128.png");
auto mask = GetResourceAsImage("images/color_wheel.png");
auto blurmf = SkBlurMaskFilter::Make(kNormal_SkBlurStyle, 5);
canvas->drawImage(image, 10, 10, nullptr);
canvas->drawImage(mask, 10 + image->width() + 10.f, 10, nullptr);
draw_masked_image(canvas, image.get(), 10, 10 + image->height() + 10.f, mask.get());
draw_masked_image(canvas, image.get(), 10 + image->width() + 10.f, 10 + image->height() + 10.f,
mask.get(), blurmf);
}
///////////////////////////////////////////////////////////////////////////////////////////////////
namespace {
enum class SkAlphaBlendMode {
kClear, // 0
kSrc, // src
kDst, // dst
kOver, // src + dst - src*dst
kIn, // src * dst
kSrcOut, // src * (1 - dst)
kDstOut, // dst * (1 - src)
kXor, // src + dst - 2*src*dst
kPlus, // src + dst
kLast = kPlus,
};
const SkBlendMode gAlphaToBlendMode[] = {
SkBlendMode::kClear, // SkAlphaBlendMode::kClear
SkBlendMode::kSrc, // SkAlphaBlendMode::kSrc
SkBlendMode::kDst, // SkAlphaBlendMode::kDst
SkBlendMode::kSrcOver, // SkAlphaBlendMode::kOver
SkBlendMode::kSrcIn, // SkAlphaBlendMode::kIn
SkBlendMode::kSrcOut, // SkAlphaBlendMode::kSrcOut
SkBlendMode::kDstOut, // SkAlphaBlendMode::kDstOut
SkBlendMode::kXor, // SkAlphaBlendMode::kXor
SkBlendMode::kPlus, // SkAlphaBlendMode::kPlus
};
}
#include "SkPictureRecorder.h"
#include "SkPath.h"
static sk_sp<SkMaskFilter> make_path_mf(const SkPath& path, unsigned alpha) {
SkPaint paint;
paint.setAntiAlias(true);
paint.setAlpha(alpha);
SkPictureRecorder recorder;
recorder.beginRecording(1000, 1000)->drawPath(path, paint);
auto shader = SkShader::MakePictureShader(recorder.finishRecordingAsPicture(),
SkShader::kClamp_TileMode, SkShader::kClamp_TileMode,
nullptr, nullptr);
return SkShaderMaskFilter::Make(shader);
}
DEF_SIMPLE_GM(combinemaskfilter, canvas, 340, 340) {
const SkRect r = { 0, 0, 100, 100 };
const SkRect r2 = r.makeOutset(1.5f, 1.5f);
SkPaint paint2;
paint2.setStyle(SkPaint::kStroke_Style);
SkPath pathA;
pathA.moveTo(r.fLeft, r.fBottom);
pathA.lineTo(r.fRight, r.fTop);
pathA.lineTo(r.fRight, r.fBottom);
auto mfA = make_path_mf(pathA, 1 * 0xFF / 3);
SkPath pathB;
pathB.moveTo(r.fLeft, r.fTop);
pathB.lineTo(r.fRight, r.fBottom);
pathB.lineTo(r.fLeft, r.fBottom);
auto mfB = make_path_mf(pathB, 2 * 0xFF / 3);
canvas->translate(10, 10);
canvas->save();
for (int i = 0; i < 9; ++i) {
SkPaint paint;
paint.setMaskFilter(SkMaskFilter::MakeCombine(mfA, mfB, gAlphaToBlendMode[i]));
canvas->drawRect(r2, paint2);
canvas->drawRect(r, paint);
canvas->translate(r.width() + 10, 0);
if ((i % 3) == 2) {
canvas->restore();
canvas->translate(0, r.height() + 10);
canvas->save();
}
}
canvas->restore();
}
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