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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 "SkBlendModePriv.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, SkBlendMode mode) {
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);
paint.setAntiAlias(true);
paint.setBlendMode(mode);
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);
paint.setAntiAlias(true);
canvas->drawOval(r, paint);
}
#include "Resources.h"
DEF_SIMPLE_GM(shadermaskfilter_image, canvas, 560, 370) {
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);
auto gradmf = SkShaderMaskFilter::Make(make_shader(SkRect::MakeIWH(mask->width(),
mask->height())));
const sk_sp<SkMaskFilter> array[] = { nullptr , blurmf, gradmf };
for (SkBlendMode mode : {SkBlendMode::kSrcOver, SkBlendMode::kSrcIn}) {
canvas->save();
for (sk_sp<SkMaskFilter> mf : array) {
draw_masked_image(canvas, image.get(), 10, 10, mask.get(), mf, mode);
canvas->translate(image->width() + 20.f, 0);
}
canvas->restore();
canvas->translate(0, image->height() + 20.f);
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
#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);
}
typedef void (*MakePathsProc)(const SkRect&, SkPath*, SkPath*);
const char* gCoverageName[] = {
"union", "sect", "diff", "rev-diff", "xor"
};
DEF_SIMPLE_GM(combinemaskfilter, canvas, 560, 510) {
const SkRect r = { 0, 0, 100, 100 };
SkPaint paint;
paint.setColor(SK_ColorRED);
SkPaint labelP;
labelP.setAntiAlias(true);
labelP.setTextSize(20);
labelP.setTextAlign(SkPaint::kCenter_Align);
const SkRect r2 = r.makeOutset(1.5f, 1.5f);
SkPaint strokePaint;
strokePaint.setStyle(SkPaint::kStroke_Style);
auto proc0 = [](const SkRect& r, SkPath* pathA, SkPath* pathB) {
pathA->moveTo(r.fLeft, r.fBottom);
pathA->lineTo(r.fRight, r.fTop);
pathA->lineTo(r.fRight, r.fBottom);
pathB->moveTo(r.fLeft, r.fTop);
pathB->lineTo(r.fRight, r.fBottom);
pathB->lineTo(r.fLeft, r.fBottom);
};
auto proc1 = [](const SkRect& r, SkPath* pathA, SkPath* pathB) {
pathA->addCircle(r.width()*0.25f, r.height()*0.25f, r.width()*0.5f);
pathB->addCircle(r.width()*0.75f, r.height()*0.75f, r.width()*0.5f);
};
MakePathsProc procs[] = { proc0, proc1 };
sk_sp<SkMaskFilter> mfA[2], mfB[2];
for (int i = 0; i < 2; ++i) {
SkPath a, b;
procs[i](r, &a, &b);
mfA[i] = make_path_mf(a, 1 * 0xFF / 3);
mfB[i] = make_path_mf(b, 2 * 0xFF / 3);
}
canvas->translate(10, 10 + 20);
canvas->save();
for (int i = 0; i < 5; ++i) {
canvas->drawText(gCoverageName[i], strlen(gCoverageName[i]), r.width()*0.5f, -10, labelP);
SkCoverageMode cmode = static_cast<SkCoverageMode>(i);
canvas->save();
// esp. on gpu side, its valuable to exercise modes that do and do-not convolve coverage
// with alpha. SrcOver and SrcIn have these properties, but also happen to "look" the same
// for this test.
const SkBlendMode bmodes[] = { SkBlendMode::kSrcOver, SkBlendMode::kSrcIn };
SkASSERT( SkBlendMode_SupportsCoverageAsAlpha(bmodes[0])); // test as-alpha
SkASSERT(!SkBlendMode_SupportsCoverageAsAlpha(bmodes[1])); // test not-as-alpha
for (auto bmode : bmodes) {
paint.setBlendMode(bmode);
for (int j = 0; j < 2; ++j) {
paint.setMaskFilter(SkMaskFilter::MakeCombine(mfA[j], mfB[j], cmode));
canvas->drawRect(r2, strokePaint);
canvas->drawRect(r, paint);
canvas->translate(0, r.height() + 10);
}
canvas->translate(0, 40);
}
canvas->restore();
canvas->translate(r.width() + 10, 0);
}
canvas->restore();
}
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