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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 "SkBitmap.h"
#include "SkCanvas.h"
#include "SkGradientShader.h"
#include "SkImageGenerator.h"
#include "SkPaint.h"
#include "SkPathOps.h"
#include "SkPicture.h"
#include "SkPictureRecorder.h"
static void draw_vector_logo(SkCanvas* canvas, const SkRect& viewBox) {
static const char kSkiaStr[] = "SKIA";
static const SkScalar kGradientPad = .1f;
static const SkScalar kVerticalSpacing = 0.25f;
static const SkScalar kAccentScale = 1.20f;
SkPaint paint;
paint.setAntiAlias(true);
paint.setSubpixelText(true);
paint.setFakeBoldText(true);
sk_tool_utils::set_portable_typeface(&paint);
SkPath path;
SkRect iBox, skiBox, skiaBox;
paint.getTextPath("SKI", 3, 0, 0, &path);
TightBounds(path, &skiBox);
paint.getTextPath("I", 1, 0, 0, &path);
TightBounds(path, &iBox);
iBox.offsetTo(skiBox.fRight - iBox.width(), iBox.fTop);
const size_t textLen = strlen(kSkiaStr);
paint.getTextPath(kSkiaStr, textLen, 0, 0, &path);
TightBounds(path, &skiaBox);
skiaBox.outset(0, 2 * iBox.width() * (kVerticalSpacing + 1));
const SkScalar accentSize = iBox.width() * kAccentScale;
const SkScalar underlineY = iBox.bottom() +
(kVerticalSpacing + SkScalarSqrt(3) / 2) * accentSize;
SkMatrix m;
m.setRectToRect(skiaBox, viewBox, SkMatrix::kFill_ScaleToFit);
SkAutoCanvasRestore acr(canvas, true);
canvas->concat(m);
canvas->drawCircle(iBox.centerX(),
iBox.y() - (0.5f + kVerticalSpacing) * accentSize,
accentSize / 2,
paint);
path.reset();
path.moveTo(iBox.centerX() - accentSize / 2, iBox.bottom() + kVerticalSpacing * accentSize);
path.rLineTo(accentSize, 0);
path.lineTo(iBox.centerX(), underlineY);
canvas->drawPath(path, paint);
SkRect underlineRect = SkRect::MakeLTRB(iBox.centerX() - iBox.width() * accentSize * 3,
underlineY,
iBox.centerX(),
underlineY + accentSize / 10);
const SkPoint pts1[] = { SkPoint::Make(underlineRect.x(), 0),
SkPoint::Make(iBox.centerX(), 0) };
const SkScalar pos1[] = { 0, 0.75f };
const SkColor colors1[] = { SK_ColorTRANSPARENT, SK_ColorBLACK };
SkASSERT(SK_ARRAY_COUNT(pos1) == SK_ARRAY_COUNT(colors1));
paint.setShader(SkGradientShader::MakeLinear(pts1, colors1, pos1, SK_ARRAY_COUNT(pos1),
SkShader::kClamp_TileMode));
canvas->drawRect(underlineRect, paint);
const SkPoint pts2[] = { SkPoint::Make(iBox.x() - iBox.width() * kGradientPad, 0),
SkPoint::Make(iBox.right() + iBox.width() * kGradientPad, 0) };
const SkScalar pos2[] = { 0, .01f, 1.0f/3, 1.0f/3, 2.0f/3, 2.0f/3, .99f, 1 };
const SkColor colors2[] = {
SK_ColorBLACK,
0xffca5139,
0xffca5139,
0xff8dbd53,
0xff8dbd53,
0xff5460a5,
0xff5460a5,
SK_ColorBLACK
};
SkASSERT(SK_ARRAY_COUNT(pos2) == SK_ARRAY_COUNT(colors2));
paint.setShader(SkGradientShader::MakeLinear(pts2, colors2, pos2, SK_ARRAY_COUNT(pos2),
SkShader::kClamp_TileMode));
canvas->drawText(kSkiaStr, textLen, 0, 0, paint);
}
// This GM exercises SkPictureImageGenerator features
// (in particular its matrix vs. bounds semantics).
class PictureGeneratorGM : public skiagm::GM {
protected:
SkString onShortName() override {
return SkString("pictureimagegenerator");
}
SkISize onISize() override {
return SkISize::Make(1160, 860);
}
void onOnceBeforeDraw() override {
const SkRect rect = SkRect::MakeWH(kPictureWidth, kPictureHeight);
SkPictureRecorder recorder;
SkCanvas* canvas = recorder.beginRecording(rect);
draw_vector_logo(canvas, rect);
fPicture = recorder.finishRecordingAsPicture();
}
void onDraw(SkCanvas* canvas) override {
const struct {
SkISize size;
SkScalar scaleX, scaleY;
SkScalar opacity;
} configs[] = {
{ SkISize::Make(200, 100), 1, 1, 1 },
{ SkISize::Make(200, 200), 1, 1, 1 },
{ SkISize::Make(200, 200), 1, 2, 1 },
{ SkISize::Make(400, 200), 2, 2, 1 },
{ SkISize::Make(200, 100), 1, 1, 0.9f },
{ SkISize::Make(200, 200), 1, 1, 0.75f },
{ SkISize::Make(200, 200), 1, 2, 0.5f },
{ SkISize::Make(400, 200), 2, 2, 0.25f },
{ SkISize::Make(200, 200), 0.5f, 1, 1 },
{ SkISize::Make(200, 200), 1, 0.5f, 1 },
{ SkISize::Make(200, 200), 0.5f, 0.5f, 1 },
{ SkISize::Make(200, 200), 2, 2, 1 },
{ SkISize::Make(200, 100), -1, 1, 1 },
{ SkISize::Make(200, 100), 1, -1, 1 },
{ SkISize::Make(200, 100), -1, -1, 1 },
{ SkISize::Make(200, 100), -1, -1, 0.5f },
};
const unsigned kDrawsPerRow = 4;
const SkScalar kDrawSize = 250;
for (size_t i = 0; i < SK_ARRAY_COUNT(configs); ++i) {
SkPaint p;
p.setAlpha(SkScalarRoundToInt(255 * configs[i].opacity));
SkMatrix m = SkMatrix::MakeScale(configs[i].scaleX, configs[i].scaleY);
if (configs[i].scaleX < 0) {
m.postTranslate(SkIntToScalar(configs[i].size.width()), 0);
}
if (configs[i].scaleY < 0) {
m.postTranslate(0, SkIntToScalar(configs[i].size.height()));
}
SkAutoTDelete<SkImageGenerator> gen(
SkImageGenerator::NewFromPicture(configs[i].size, fPicture.get(), &m,
p.getAlpha() != 255 ? &p : nullptr));
SkBitmap bm;
gen->generateBitmap(&bm);
const SkScalar x = kDrawSize * (i % kDrawsPerRow);
const SkScalar y = kDrawSize * (i / kDrawsPerRow);
p.setColor(0xfff0f0f0);
p.setAlpha(255);
canvas->drawRect(SkRect::MakeXYWH(x, y,
SkIntToScalar(bm.width()),
SkIntToScalar(bm.height())), p);
canvas->drawBitmap(bm, x, y);
}
}
private:
sk_sp<SkPicture> fPicture;
const SkScalar kPictureWidth = 200;
const SkScalar kPictureHeight = 100;
typedef skiagm::GM INHERITED;
};
DEF_GM(return new PictureGeneratorGM;)
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