blob: 68b179e1ac3e5f0c4037d112048650f839ffd68a [file] [log] [blame]
/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "include/core/SkCanvas.h"
#include "include/core/SkDrawable.h"
#include "include/core/SkPath.h"
#include "include/core/SkRSXform.h"
#include "include/core/SkString.h"
#include "include/core/SkSurface.h"
#include "include/effects/SkGradientShader.h"
#include "include/utils/SkRandom.h"
#include "include/utils/SkTextUtils.h"
#include "samplecode/Sample.h"
const SkBlendMode gModes[] = {
SkBlendMode::kSrcOver,
SkBlendMode::kSrc,
SkBlendMode::kSrcIn,
SkBlendMode::kSrcOut,
SkBlendMode::kSrcATop,
SkBlendMode::kDstOver,
SkBlendMode::kDstIn,
SkBlendMode::kDstOut,
SkBlendMode::kDstATop,
};
const int N_Modes = SK_ARRAY_COUNT(gModes);
static SkRandom gRand;
struct ModeButton {
SkString fLabel;
SkColor fColor;
SkRect fRect;
public:
void init(const char label[], const SkRect& rect) {
fLabel = label;
fRect = rect;
fColor = (gRand.nextU() & 0x7F7F7F7F) | SkColorSetARGB(0xFF, 0, 0, 0x80);
}
void draw(SkCanvas* canvas) {
SkPaint paint;
paint.setAntiAlias(true);
paint.setColor(fColor);
canvas->drawRoundRect(fRect, 8, 8, paint);
paint.setColor(0xFFFFFFFF);
SkFont font;
font.setSize(16);
font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
SkTextUtils::DrawString(canvas, fLabel.c_str(), fRect.centerX(), fRect.fTop + 0.68f * fRect.height(),
font, paint, SkTextUtils::kCenter_Align);
}
bool hitTest(SkScalar x, SkScalar y) {
return fRect.intersects({x - 1, y - 1, x + 1, y + 1});
}
};
class ModeDrawable : public SkDrawable {
public:
ModeDrawable() : fMode(SkBlendMode::kSrcOver), fLoc(SkPoint::Make(0, 0)) {}
SkBlendMode fMode;
SkPoint fLoc;
bool hitTest(SkScalar x, SkScalar y) {
SkRect target = SkRect::MakeXYWH(x - fLoc.x() - 1, y - fLoc.y() - 1, 3, 3);
return this->getBounds().intersects(target);
}
};
class CircDrawable : public ModeDrawable {
SkPaint fPaint;
SkRect fBounds;
public:
CircDrawable(SkScalar size, SkColor c) {
const SkColor colors[] = { 0, c };
fPaint.setShader(SkGradientShader::MakeRadial(SkPoint::Make(size/2, size/2), size/2,
colors, nullptr, 2,
SkTileMode::kClamp));
fBounds = SkRect::MakeWH(size, size);
}
protected:
SkRect onGetBounds() override {
return fBounds;
}
void onDraw(SkCanvas* canvas) override {
fPaint.setBlendMode(fMode);
canvas->save();
canvas->translate(fLoc.x(), fLoc.y());
canvas->drawOval(fBounds, fPaint);
canvas->restore();
}
};
class XferDemo : public Sample {
enum {
N = 4
};
SkRect fModeRect[N_Modes];
ModeButton fModeButtons[N_Modes];
sk_sp<CircDrawable> fDrs[N];
CircDrawable* fSelected;
void addButtons() {
SkScalar x = 10;
SkScalar y = 10;
for (int i = 0; i < N_Modes; ++i) {
fModeButtons[i].init(SkBlendMode_Name(gModes[i]), SkRect::MakeXYWH(x, y, 70, 25));
fModeRect[i] = SkRect::MakeXYWH(x, y + 28, 70, 2);
x += 80;
}
}
public:
XferDemo() {
const SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorBLACK };
for (int i = 0; i < N; ++i) {
fDrs[i].reset(new CircDrawable(200, colors[i]));
fDrs[i]->fLoc.set(100.f + i * 100, 100.f + i * 100);
fDrs[i]->fMode = SkBlendMode::kSrcOver;
}
fSelected = nullptr;
this->addButtons();
}
protected:
SkString name() override { return SkString("XferDemo"); }
void onDrawContent(SkCanvas* canvas) override {
for (int i = 0; i < N_Modes; ++i) {
fModeButtons[i].draw(canvas);
}
SkPaint paint;
if (fSelected) {
for (int i = 0; i < N_Modes; ++i) {
if (fSelected->fMode == gModes[i]) {
canvas->drawRect(fModeRect[i], paint);
break;
}
}
}
canvas->saveLayer(nullptr, nullptr);
for (int i = 0; i < N; ++i) {
fDrs[i]->draw(canvas);
}
canvas->restore();
}
Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey) override {
// Check mode buttons first
for (int i = 0; i < N_Modes; ++i) {
if (fModeButtons[i].hitTest(x, y)) {
Click* click = new Click();
click->fMeta.setS32("mode", i);
return click;
}
}
fSelected = nullptr;
for (int i = N - 1; i >= 0; --i) {
if (fDrs[i]->hitTest(x, y)) {
fSelected = fDrs[i].get();
break;
}
}
return fSelected ? new Click() : nullptr;
}
bool onClick(Click* click) override {
int32_t mode;
if (click->fMeta.findS32("mode", &mode)) {
if (fSelected && skui::InputState::kUp == click->fState) {
fSelected->fMode = gModes[mode];
}
} else {
fSelected->fLoc.fX += click->fCurr.fX - click->fPrev.fX;
fSelected->fLoc.fY += click->fCurr.fY - click->fPrev.fY;
}
return true;
}
private:
using INHERITED = Sample;
};
DEF_SAMPLE( return new XferDemo; )
//////////////////////////////////////////////////////////////////////////////
#include "tools/Resources.h"
class CubicResamplerDemo : public Sample {
struct Rec {
sk_sp<SkImage> fImage;
SkRect fBounds;
void draw(SkCanvas* canvas, SkCubicResampler cubic) const {
SkRect r = fBounds;
SkPaint paint;
SkMatrix lm = SkMatrix::Translate(r.x(), r.y())
* SkMatrix::Scale(10, 10);
paint.setShader(fImage->makeShader(SkSamplingOptions(), lm));
canvas->drawRect(r, paint);
r.offset(r.width() + 10, 0);
lm.postTranslate(r.width() + 10, 0);
paint.setShader(fImage->makeShader(SkSamplingOptions(SkFilterMode::kLinear), lm));
canvas->drawRect(r, paint);
r.offset(r.width() + 10, 0);
lm.postTranslate(r.width() + 10, 0);
paint.setShader(fImage->makeShader(SkTileMode::kClamp, SkTileMode::kClamp,
SkSamplingOptions(cubic), &lm));
canvas->drawRect(r, paint);
}
};
std::vector<Rec> fRecs;
public:
CubicResamplerDemo() {
const char* names[] = {
"images/mandrill_128.png",
"images/rle.bmp",
"images/example_4.png",
};
SkRect r = {10, 10, 200, 200};
for (auto name : names) {
fRecs.push_back({GetResourceAsImage(name), r});
r.offset(0, r.height() + 10);
}
fDomain.setXYWH(r.fLeft + 3*r.width() + 40, 50, 200, 200);
fCubic = {.3f, .5f};
}
protected:
SkString name() override { return SkString("CubicResampler"); }
void onDrawContent(SkCanvas* canvas) override {
for (const auto& rec : fRecs) {
rec.draw(canvas, fCubic);
}
SkPaint paint;
paint.setAntiAlias(true);
paint.setStroke(true);
canvas->drawRect(fDomain, paint);
paint.setColor(SK_ColorRED);
paint.setStroke(false);
SkPoint loc = SkMatrix::RectToRect({0,0,1,1}, fDomain).mapXY(fCubic.B, fCubic.C);
canvas->drawCircle(loc.fX, loc.fY, 8, paint);
SkString str;
str.printf("B=%4.2f C=%4.2f", fCubic.B, fCubic.C);
SkFont font;
font.setSize(25);
font.setEdging(SkFont::Edging::kAntiAlias);
paint.setColor(SK_ColorBLACK);
canvas->drawSimpleText(str.c_str(), str.size(), SkTextEncoding::kUTF8,
fDomain.fLeft + 10, fDomain.fBottom + 40, font, paint);
}
static float pin_unitize(float min, float max, float value) {
return (std::min(std::max(value, min), max) - min) / (max - min);
}
static SkPoint pin_unitize(const SkRect& r, SkPoint p) {
return {
pin_unitize(r.fLeft, r.fRight, p.fX),
pin_unitize(r.fTop, r.fBottom, p.fY),
};
}
Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey) override {
if (fDomain.contains(x, y)) {
return new Click([this](Click* click) {
auto [B, C] = pin_unitize(fDomain, click->fCurr);
fCubic = {B, C};
return true;
});
}
return nullptr;
}
private:
SkRect fDomain;
SkImage::CubicResampler fCubic;
using INHERITED = Sample;
};
DEF_SAMPLE( return new CubicResamplerDemo; )