blob: 9339311b38824923bf6e153dc33feb82d5306396 [file] [log] [blame]
/*
* 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/gm.h"
#include "include/core/SkBlendMode.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkColorFilter.h"
#include "include/core/SkColorSpace.h"
#include "include/core/SkFont.h"
#include "include/core/SkFontTypes.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkShader.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkTileMode.h"
#include "include/core/SkTypeface.h"
#include "include/core/SkTypes.h"
#include "include/effects/SkGradientShader.h"
#include "include/effects/SkLumaColorFilter.h"
#include "include/effects/SkRuntimeEffect.h"
#include "src/core/SkColorFilterPriv.h"
#include "tools/Resources.h"
#include "tools/ToolUtils.h"
#include <string.h>
static SkScalar kSize = 80;
static SkScalar kInset = 10;
static SkColor kColor1 = SkColorSetARGB(0xff, 0xff, 0xff, 0);
static SkColor kColor2 = SkColorSetARGB(0xff, 0x82, 0xff, 0);
static void draw_label(SkCanvas* canvas, const char* label,
const SkPoint& offset) {
SkFont font(ToolUtils::create_portable_typeface());
font.setEdging(SkFont::Edging::kAlias);
size_t len = strlen(label);
SkScalar width = font.measureText(label, len, SkTextEncoding::kUTF8);
canvas->drawSimpleText(label, len, SkTextEncoding::kUTF8, offset.x() - width / 2, offset.y(),
font, SkPaint());
}
static void draw_scene(SkCanvas* canvas, const sk_sp<SkColorFilter>& filter, SkBlendMode mode,
const sk_sp<SkShader>& s1, const sk_sp<SkShader>& s2) {
SkPaint paint;
paint.setAntiAlias(true);
SkRect r, c, bounds = SkRect::MakeWH(kSize, kSize);
c = bounds;
c.fRight = bounds.centerX();
paint.setARGB(0x20, 0, 0, 0xff);
canvas->drawRect(bounds, paint);
canvas->saveLayer(&bounds, nullptr);
r = bounds;
r.inset(kInset, 0);
paint.setShader(s1);
paint.setColor(s1 ? SK_ColorBLACK : SkColorSetA(kColor1, 0x80));
canvas->drawOval(r, paint);
if (!s1) {
canvas->save();
canvas->clipRect(c);
paint.setColor(kColor1);
canvas->drawOval(r, paint);
canvas->restore();
}
SkPaint xferPaint;
xferPaint.setBlendMode(mode);
canvas->saveLayer(&bounds, &xferPaint);
r = bounds;
r.inset(0, kInset);
paint.setShader(s2);
paint.setColor(s2 ? SK_ColorBLACK : SkColorSetA(kColor2, 0x80));
paint.setColorFilter(filter);
canvas->drawOval(r, paint);
if (!s2) {
canvas->save();
canvas->clipRect(c);
paint.setColor(kColor2);
canvas->drawOval(r, paint);
canvas->restore();
}
canvas->restore();
canvas->restore();
}
class LumaFilterGM : public skiagm::GM {
protected:
void onOnceBeforeDraw() override {
SkColor g1Colors[] = { kColor1, SkColorSetA(kColor1, 0x20) };
SkColor g2Colors[] = { kColor2, SkColorSetA(kColor2, 0x20) };
SkPoint g1Points[] = { { 0, 0 }, { 0, 100 } };
SkPoint g2Points[] = { { 0, 0 }, { kSize, 0 } };
SkScalar pos[] = { 0.2f, 1.0f };
fFilter = SkLumaColorFilter::Make();
fGr1 = SkGradientShader::MakeLinear(g1Points, g1Colors, pos, std::size(g1Colors),
SkTileMode::kClamp);
fGr2 = SkGradientShader::MakeLinear(g2Points, g2Colors, pos, std::size(g2Colors),
SkTileMode::kClamp);
}
SkString onShortName() override {
return SkString("lumafilter");
}
SkISize onISize() override {
return SkISize::Make(600, 420);
}
void onDraw(SkCanvas* canvas) override {
SkBlendMode modes[] = {
SkBlendMode::kSrcOver,
SkBlendMode::kDstOver,
SkBlendMode::kSrcATop,
SkBlendMode::kDstATop,
SkBlendMode::kSrcIn,
SkBlendMode::kDstIn,
};
struct {
const sk_sp<SkShader>& fShader1;
const sk_sp<SkShader>& fShader2;
} shaders[] = {
{ nullptr, nullptr },
{ nullptr, fGr2 },
{ fGr1, nullptr },
{ fGr1, fGr2 },
};
SkScalar gridStep = kSize + 2 * kInset;
for (size_t i = 0; i < std::size(modes); ++i) {
draw_label(canvas, SkBlendMode_Name(modes[i]),
SkPoint::Make(gridStep * (0.5f + i), 20));
}
for (size_t i = 0; i < std::size(shaders); ++i) {
canvas->save();
canvas->translate(kInset, gridStep * i + 30);
for (size_t m = 0; m < std::size(modes); ++m) {
draw_scene(canvas, fFilter, modes[m], shaders[i].fShader1,
shaders[i].fShader2);
canvas->translate(gridStep, 0);
}
canvas->restore();
}
}
private:
sk_sp<SkColorFilter> fFilter;
sk_sp<SkShader> fGr1, fGr2;
using INHERITED = skiagm::GM;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new LumaFilterGM;)
DEF_SIMPLE_GM(AlternateLuma, canvas, 384,128) {
sk_sp<SkImage> img = GetResourceAsImage("images/mandrill_128.png");
if (!img) {
return;
}
// Normal luma colorfilter on the left.
SkPaint paint;
paint.setColorFilter(SkLumaColorFilter::Make());
canvas->drawImage(img, 0,0, SkSamplingOptions{}, &paint);
canvas->translate(128,0);
// Original image in the middle for reference.
canvas->drawImage(img, 0,0);
canvas->translate(128,0);
// Here, RGB holds CIE XYZ. Splatting the G (Y) channel should result in (near) greyscale.
auto [effect, err] = SkRuntimeEffect::MakeForColorFilter(SkString{
"half4 main(half4 inColor) { return inColor.ggga; }"});
SkASSERT(effect && err.isEmpty());
sk_sp<SkColorFilter> filter = effect->makeColorFilter(SkData::MakeEmpty());
SkASSERT(filter);
SkAlphaType unpremul = kUnpremul_SkAlphaType;
paint.setColorFilter(SkColorFilterPriv::WithWorkingFormat(std::move(filter),
&SkNamedTransferFn::kLinear,
&SkNamedGamut::kXYZ,
&unpremul));
canvas->drawImage(img, 0,0, SkSamplingOptions{}, &paint);
}