skia2/gm/androidblendmodes.cpp
Mike Reed 07c5f52c94 Pass sampling to drawImage calls
Bug: skia:7650
Change-Id: Ie4a1c263bd54553a7cc31ee0ff1585f34a0369a5
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/358176
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
2021-01-23 18:23:33 +00:00

137 lines
4.5 KiB
C++

/*
* 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/gm.h"
#include "include/core/SkBitmap.h"
#include "include/core/SkBlendMode.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkFont.h"
#include "include/core/SkImageInfo.h"
#include "include/core/SkPaint.h"
#include "include/core/SkRect.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkTypeface.h"
#include "include/utils/SkTextUtils.h"
#include "tools/ToolUtils.h"
#include <initializer_list>
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(ToolUtils::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(ToolUtils::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->drawImage(fCompositeDst.asImage(), 0, 0, SkSamplingOptions(), &p);
p.setBlendMode(mode);
canvas->drawImage(fCompositeSrc.asImage(), 0, 0, SkSamplingOptions(), &p);
}
void onDraw(SkCanvas* canvas) override {
SkFont font(ToolUtils::create_portable_typeface());
ToolUtils::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;
using INHERITED = GM;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new AndroidBlendModesGM;)
} // namespace skiagm