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/*
* 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 "gm.h"
#include "SkArithmeticMode.h"
#include "SkShader.h"
#include "SkXfermode.h"
enum {
kXfermodeCount = SkXfermode::kLastMode + 2, // All xfermodes plus arithmetic mode.
kShapeSize = 22,
kShapeSpacing = 36,
kShapeTypeSpacing = 4 * kShapeSpacing/3,
kPaintSpacing = 2 * kShapeSpacing,
kPadding = (kPaintSpacing - kShapeSpacing) / 2,
kPaintWidth = 3*kShapeSpacing + 2*kShapeTypeSpacing + kShapeSize,
kPaintPadding = kPaintSpacing - kShapeSize,
};
static const SkColor kBGColor = SkColorSetARGB(200, 210, 184, 135);
static const SkColor kShapeColors[3] = {
SkColorSetARGB(130, 255, 0, 128), // input color unknown
SkColorSetARGB(255, 0, 255, 255), // input color opaque
SkColorSetARGB(255, 255, 255, 255) // input solid white
};
enum Shape {
kSquare_Shape,
kDiamond_Shape,
kOval_Shape,
kLast_Shape = kOval_Shape
};
namespace skiagm {
static void draw_shape(SkCanvas* canvas, Shape shape, const SkColor color, size_t xfermodeIdx);
/**
* Verifies AA works properly on all Xfermodes, including arithmetic, with various color invariants.
*/
class AAXfermodesGM : public GM {
public:
AAXfermodesGM() {}
protected:
SkString onShortName() override {
return SkString("aaxfermodes");
}
SkISize onISize() override {
return SkISize::Make(3*kPaintWidth + 2*kPaintPadding + 2*kPadding,
(2 + SkXfermode::kLastCoeffMode) * kShapeSpacing + 2*kPadding);
}
void onDraw(SkCanvas* canvas) override {
sk_tool_utils::draw_checkerboard(canvas, 0xffffffff, 0xffc0c0c0, 10);
canvas->saveLayer(NULL, NULL);
canvas->drawColor(kBGColor, SkXfermode::kSrc_Mode);
canvas->translate(kPadding + kShapeSize/2, kPadding + kShapeSpacing + kShapeSize/2);
for (size_t colorIdx = 0; colorIdx < SK_ARRAY_COUNT(kShapeColors); colorIdx++) {
SkColor color = kShapeColors[colorIdx];
for (size_t shapeIdx = 0; shapeIdx <= kLast_Shape; shapeIdx++) {
Shape shape = static_cast<Shape>(shapeIdx);
canvas->save();
for (size_t xfermodeIdx = 0; xfermodeIdx < kXfermodeCount; xfermodeIdx++) {
draw_shape(canvas, shape, color, xfermodeIdx);
if (xfermodeIdx == SkXfermode::kLastCoeffMode) {
// New column.
canvas->restore();
canvas->translate(kShapeSpacing, 0);
canvas->save();
} else {
canvas->translate(0, kShapeSpacing);
}
}
canvas->restore();
if (shape != kLast_Shape) {
canvas->translate(kShapeTypeSpacing, 0);
} else {
canvas->translate(kPaintSpacing, 0);
}
}
}
canvas->restore();
SkPaint textPaint;
textPaint.setAntiAlias(true);
sk_tool_utils::set_portable_typeface(&textPaint);
textPaint.setTextAlign(SkPaint::kCenter_Align);
textPaint.setFakeBoldText(true);
textPaint.setTextSize(21 * kShapeSize/32);
canvas->translate(kPadding + kPaintWidth/2,
kPadding + kShapeSize/2 + textPaint.getTextSize()/4);
canvas->drawText("input color unknown", sizeof("input color unknown") - 1, 0, 0, textPaint);
canvas->translate(kPaintWidth + kPaintPadding, 0);
canvas->drawText("input color opaque", sizeof("input color opaque") - 1, 0, 0, textPaint);
canvas->translate(kPaintWidth + kPaintPadding, 0);
canvas->drawText("input solid white", sizeof("input solid white") - 1, 0, 0, textPaint);
}
private:
typedef GM INHERITED;
};
static void draw_shape(SkCanvas* canvas, Shape shape, const SkColor color, size_t xfermodeIdx) {
SkPaint shapePaint;
shapePaint.setAntiAlias(kSquare_Shape != shape);
shapePaint.setColor(color);
SkAutoTUnref<SkXfermode> xfermode;
if (xfermodeIdx <= SkXfermode::kLastMode) {
SkXfermode::Mode mode = static_cast<SkXfermode::Mode>(xfermodeIdx);
xfermode.reset(SkXfermode::Create(mode));
} else {
xfermode.reset(SkArithmeticMode::Create(+1.0f, +0.25f, -0.5f, +0.1f));
}
shapePaint.setXfermode(xfermode);
if (xfermodeIdx == SkXfermode::kPlus_Mode) {
// Check for overflow and dim the src and dst colors if we need to, otherwise we might get
// confusing AA artifacts.
int maxSum = SkTMax(SkTMax(SkColorGetA(kBGColor) + SkColorGetA(color),
SkColorGetR(kBGColor) + SkColorGetR(color)),
SkTMax(SkColorGetG(kBGColor) + SkColorGetG(color),
SkColorGetB(kBGColor) + SkColorGetB(color)));
if (maxSum > 255) {
SkPaint dimPaint;
dimPaint.setARGB(255 * 255 / maxSum, 0, 0, 0);
dimPaint.setAntiAlias(false);
dimPaint.setXfermode(SkXfermode::Create(SkXfermode::kDstIn_Mode));
canvas->drawRectCoords(-kShapeSpacing/2, -kShapeSpacing/2,
kShapeSpacing/2, kShapeSpacing/2, dimPaint);
shapePaint.setAlpha(255 * shapePaint.getAlpha() / maxSum);
}
}
switch (shape) {
case kSquare_Shape:
canvas->drawRectCoords(-kShapeSize/2, -kShapeSize/2, kShapeSize/2, kShapeSize/2,
shapePaint);
break;
case kDiamond_Shape:
canvas->save();
canvas->rotate(45);
canvas->drawRectCoords(-kShapeSize/2, -kShapeSize/2, kShapeSize/2, kShapeSize/2,
shapePaint);
canvas->restore();
break;
case kOval_Shape:
canvas->save();
canvas->rotate(static_cast<SkScalar>((511 * xfermodeIdx + 257) % 360));
canvas->drawArc(SkRect::MakeLTRB(-kShapeSize/2, -1.4f * kShapeSize/2,
kShapeSize/2, 1.4f * kShapeSize/2),
0, 360, true, shapePaint);
canvas->restore();
break;
default:
SkFAIL("Invalid shape.");
}
}
//////////////////////////////////////////////////////////////////////////////
static GM* MyFactory(void*) { return new AAXfermodesGM; }
static GMRegistry reg(MyFactory);
}
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