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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 "sk_tool_utils.h"
#include "SkCanvas.h"
#include "SkRSXform.h"
#include "SkSurface.h"
// Create a square atlas of:
// opaque white | opaque red
// ------------------------------------
// opaque green | transparent black
//
static sk_sp<SkImage> make_atlas(SkCanvas* caller, int atlasSize) {
const int kBlockSize = atlasSize/2;
SkImageInfo info = SkImageInfo::MakeN32Premul(atlasSize, atlasSize);
auto surface(caller->makeSurface(info));
if (nullptr == surface) {
surface = SkSurface::MakeRaster(info);
}
SkCanvas* canvas = surface->getCanvas();
SkPaint paint;
paint.setBlendMode(SkBlendMode::kSrc);
paint.setColor(SK_ColorWHITE);
SkRect r = SkRect::MakeXYWH(0, 0,
SkIntToScalar(kBlockSize), SkIntToScalar(kBlockSize));
canvas->drawRect(r, paint);
paint.setColor(SK_ColorRED);
r = SkRect::MakeXYWH(SkIntToScalar(kBlockSize), 0,
SkIntToScalar(kBlockSize), SkIntToScalar(kBlockSize));
canvas->drawRect(r, paint);
paint.setColor(SK_ColorGREEN);
r = SkRect::MakeXYWH(0, SkIntToScalar(kBlockSize),
SkIntToScalar(kBlockSize), SkIntToScalar(kBlockSize));
canvas->drawRect(r, paint);
paint.setColor(SK_ColorTRANSPARENT);
r = SkRect::MakeXYWH(SkIntToScalar(kBlockSize), SkIntToScalar(kBlockSize),
SkIntToScalar(kBlockSize), SkIntToScalar(kBlockSize));
canvas->drawRect(r, paint);
return surface->makeImageSnapshot();
}
// This GM tests the drawAtlas API with colors, different xfer modes
// and transparency in the atlas image
class DrawAtlasColorsGM : public skiagm::GM {
public:
DrawAtlasColorsGM() {
this->setBGColor(sk_tool_utils::color_to_565(0xFFCCCCCC));
}
protected:
SkString onShortName() override {
return SkString("draw-atlas-colors");
}
SkISize onISize() override {
return SkISize::Make(kNumXferModes * (kAtlasSize + kPad) + kPad,
2 * kNumColors * (kAtlasSize + kPad) + kTextPad + kPad);
}
void onDraw(SkCanvas* canvas) override {
const SkRect target = SkRect::MakeWH(SkIntToScalar(kAtlasSize), SkIntToScalar(kAtlasSize));
auto atlas = make_atlas(canvas, kAtlasSize);
const SkBlendMode gModes[] = {
SkBlendMode::kClear,
SkBlendMode::kSrc,
SkBlendMode::kDst,
SkBlendMode::kSrcOver,
SkBlendMode::kDstOver,
SkBlendMode::kSrcIn,
SkBlendMode::kDstIn,
SkBlendMode::kSrcOut,
SkBlendMode::kDstOut,
SkBlendMode::kSrcATop,
SkBlendMode::kDstATop,
SkBlendMode::kXor,
SkBlendMode::kPlus,
SkBlendMode::kModulate,
SkBlendMode::kScreen,
SkBlendMode::kOverlay,
SkBlendMode::kDarken,
SkBlendMode::kLighten,
SkBlendMode::kColorDodge,
SkBlendMode::kColorBurn,
SkBlendMode::kHardLight,
SkBlendMode::kSoftLight,
SkBlendMode::kDifference,
SkBlendMode::kExclusion,
SkBlendMode::kMultiply,
SkBlendMode::kHue,
SkBlendMode::kSaturation,
SkBlendMode::kColor,
SkBlendMode::kLuminosity,
};
SkColor gColors[] = {
SK_ColorWHITE,
SK_ColorRED,
0x88888888, // transparent grey
0x88000088 // transparent blue
};
const int numModes = SK_ARRAY_COUNT(gModes);
SkASSERT(numModes == kNumXferModes);
const int numColors = SK_ARRAY_COUNT(gColors);
SkASSERT(numColors == kNumColors);
SkRSXform xforms[numColors];
SkRect rects[numColors];
SkColor quadColors[numColors];
SkPaint paint;
paint.setAntiAlias(true);
for (int i = 0; i < numColors; ++i) {
xforms[i].set(1.0f, 0.0f, SkIntToScalar(kPad), i*(target.width()+kPad));
rects[i] = target;
quadColors[i] = gColors[i];
}
SkPaint textP;
textP.setTextSize(SkIntToScalar(kTextPad));
textP.setAntiAlias(true);
sk_tool_utils::set_portable_typeface(&textP, nullptr);
for (int i = 0; i < numModes; ++i) {
const char* label = SkBlendMode_Name(gModes[i]);
canvas->drawString(label,
i*(target.width()+kPad)+kPad, SkIntToScalar(kTextPad),
textP);
}
for (int i = 0; i < numModes; ++i) {
canvas->save();
canvas->translate(SkIntToScalar(i*(target.height()+kPad)),
SkIntToScalar(kTextPad+kPad));
// w/o a paint
canvas->drawAtlas(atlas.get(), xforms, rects, quadColors, numColors,
gModes[i], nullptr, nullptr);
canvas->translate(0.0f, numColors*(target.height()+kPad));
// w a paint
canvas->drawAtlas(atlas.get(), xforms, rects, quadColors, numColors,
gModes[i], nullptr, &paint);
canvas->restore();
}
}
private:
static constexpr int kNumXferModes = 29;
static constexpr int kNumColors = 4;
static constexpr int kAtlasSize = 30;
static constexpr int kPad = 2;
static constexpr int kTextPad = 8;
typedef GM INHERITED;
};
DEF_GM( return new DrawAtlasColorsGM; )
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