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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 "SkBitmap.h"
#include "SkTextUtils.h"
namespace skiagm {
// This GM recreates the blend mode images from the Android documentation
class AndroidBlendModesGM : public GM {
public:
AndroidBlendModesGM() {
this->setBGColor(SK_ColorBLACK);
}
protected:
SkString onShortName() override {
return SkString("androidblendmodes");
}
SkISize onISize() override {
return SkISize::Make(kNumCols * kBitmapSize, kNumRows * kBitmapSize);
}
void onOnceBeforeDraw() override {
SkImageInfo ii = SkImageInfo::MakeN32Premul(kBitmapSize, kBitmapSize);
{
fCompositeSrc.allocPixels(ii);
SkCanvas tmp(fCompositeSrc);
tmp.clear(SK_ColorTRANSPARENT);
SkPaint p;
p.setAntiAlias(true);
p.setColor(sk_tool_utils::color_to_565(kBlue));
tmp.drawRect(SkRect::MakeLTRB(16, 96, 160, 240), p);
}
{
fCompositeDst.allocPixels(ii);
SkCanvas tmp(fCompositeDst);
tmp.clear(SK_ColorTRANSPARENT);
SkPaint p;
p.setAntiAlias(true);
p.setColor(sk_tool_utils::color_to_565(kRed));
tmp.drawCircle(160, 95, 80, p);
}
}
void drawTile(SkCanvas* canvas, int xOffset, int yOffset, SkBlendMode mode) {
canvas->translate(xOffset, yOffset);
canvas->clipRect(SkRect::MakeXYWH(0, 0, 256, 256));
canvas->saveLayer(nullptr, nullptr);
SkPaint p;
canvas->drawBitmap(fCompositeDst, 0, 0, &p);
p.setBlendMode(mode);
canvas->drawBitmap(fCompositeSrc, 0, 0, &p);
}
void onDraw(SkCanvas* canvas) override {
SkFont font(sk_tool_utils::create_portable_typeface());
sk_tool_utils::draw_checkerboard(canvas,
kWhite,
kGrey,
32);
int xOffset = 0, yOffset = 0;
// Android doesn't expose all the blend modes
// Note that the Android documentation calls:
// Skia's kPlus, add
// Skia's kModulate, multiply
for (SkBlendMode mode : { SkBlendMode::kPlus /* add */, SkBlendMode::kClear,
SkBlendMode::kDarken, SkBlendMode::kDst,
SkBlendMode::kDstATop, SkBlendMode::kDstIn,
SkBlendMode::kDstOut, SkBlendMode::kDstOver,
SkBlendMode::kLighten, SkBlendMode::kModulate /* multiply */,
SkBlendMode::kOverlay, SkBlendMode::kScreen,
SkBlendMode::kSrc, SkBlendMode::kSrcATop,
SkBlendMode::kSrcIn, SkBlendMode::kSrcOut,
SkBlendMode::kSrcOver, SkBlendMode::kXor } ) {
int saveCount = canvas->save();
this->drawTile(canvas, xOffset, yOffset, mode);
canvas->restoreToCount(saveCount);
SkTextUtils::DrawString(canvas, SkBlendMode_Name(mode),
xOffset + kBitmapSize/2.0f,
yOffset + kBitmapSize,
font, SkPaint(), SkTextUtils::kCenter_Align);
xOffset += 256;
if (xOffset >= 1024) {
xOffset = 0;
yOffset += 256;
}
}
}
private:
static const int kBitmapSize = 256;
static const int kNumRows = 5;
static const int kNumCols = 4;
static const SkColor kBlue = SkColorSetARGB(255, 22, 150, 243);
static const SkColor kRed = SkColorSetARGB(255, 233, 30, 99);
static const SkColor kWhite = SkColorSetARGB(255, 243, 243, 243);
static const SkColor kGrey = SkColorSetARGB(255, 222, 222, 222);
SkBitmap fCompositeSrc;
SkBitmap fCompositeDst;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new AndroidBlendModesGM;)
}