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/*
* Copyright 2014 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 "SkCanvas.h"
#include "SkGradientShader.h"
#include "SkPath.h"
#include "SkRandom.h"
int make_bm(SkBitmap* bm, int height) {
static const int kRadius = 22;
static const int kMargin = 8;
static const SkScalar kStartAngle = 0;
static const SkScalar kDAngle = 25;
static const SkScalar kSweep = 320;
static const SkScalar kThickness = 8;
int count = (height / (2 * kRadius + kMargin));
height = count * (2 * kRadius + kMargin);
bm->allocN32Pixels(2 * (kRadius + kMargin), height);
SkRandom random;
SkCanvas wholeCanvas(*bm);
wholeCanvas.clear(0x00000000);
SkScalar angle = kStartAngle;
for (int i = 0; i < count; ++i) {
SkPaint paint;
// The sw rasterizer disables AA for large canvii. So we make a small canvas for each draw.
SkBitmap smallBM;
SkIRect subRect = SkIRect::MakeXYWH(0, i * (kMargin + 2 * kRadius),
2 * kRadius + kMargin, 2 * kRadius + kMargin);
bm->extractSubset(&smallBM, subRect);
SkCanvas canvas(smallBM);
canvas.translate(kMargin + kRadius, kMargin + kRadius);
paint.setAntiAlias(true);
paint.setColor(random.nextU() | 0xFF000000);
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(kThickness);
paint.setStrokeCap(SkPaint::kRound_Cap);
SkScalar radius = kRadius - kThickness / 2;
SkRect bounds = SkRect::MakeLTRB(-radius, -radius, radius, radius);
canvas.drawArc(bounds, angle, kSweep, false, paint);
angle += kDAngle;
}
bm->setImmutable();
return count;
}
class TallStretchedBitmapsGM : public skiagm::GM {
public:
TallStretchedBitmapsGM() {}
protected:
SkString onShortName() override {
return SkString("tall_stretched_bitmaps");
}
SkISize onISize() override {
return SkISize::Make(750, 750);
}
void onOnceBeforeDraw() override {
for (size_t i = 0; i < SK_ARRAY_COUNT(fTallBmps); ++i) {
int h = SkToInt((4 + i) * 1024);
fTallBmps[i].fItemCnt = make_bm(&fTallBmps[i].fBmp, h);
}
}
void onDraw(SkCanvas* canvas) override {
canvas->scale(1.3f, 1.3f);
for (size_t i = 0; i < SK_ARRAY_COUNT(fTallBmps); ++i) {
SkASSERT(fTallBmps[i].fItemCnt > 10);
SkBitmap bmp = fTallBmps[i].fBmp;
// Draw the last 10 elements of the bitmap.
int startItem = fTallBmps[i].fItemCnt - 10;
int itemHeight = bmp.height() / fTallBmps[i].fItemCnt;
SkIRect subRect = SkIRect::MakeLTRB(0, startItem * itemHeight,
bmp.width(), bmp.height());
SkRect dstRect = SkRect::MakeWH(SkIntToScalar(bmp.width()), 10.f * itemHeight);
SkPaint paint;
paint.setFilterQuality(kLow_SkFilterQuality);
canvas->drawBitmapRect(bmp, &subRect, dstRect, &paint);
canvas->translate(SkIntToScalar(bmp.width() + 10), 0);
}
}
private:
struct {
SkBitmap fBmp;
int fItemCnt;
} fTallBmps[8];
typedef skiagm::GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return SkNEW(TallStretchedBitmapsGM);)
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