114 lines
3.7 KiB
C++
114 lines
3.7 KiB
C++
/*
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* Copyright 2014 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gm/gm.h"
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#include "include/core/SkBitmap.h"
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#include "include/core/SkCanvas.h"
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#include "include/core/SkImage.h"
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#include "include/core/SkPaint.h"
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#include "include/core/SkRect.h"
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#include "include/core/SkScalar.h"
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#include "include/core/SkSize.h"
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#include "include/core/SkString.h"
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#include "include/core/SkTypes.h"
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#include "include/private/SkTo.h"
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#include "include/utils/SkRandom.h"
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int make_bm(SkBitmap* bm, int height) {
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constexpr int kRadius = 22;
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constexpr int kMargin = 8;
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constexpr SkScalar kStartAngle = 0;
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constexpr SkScalar kDAngle = 25;
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constexpr SkScalar kSweep = 320;
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constexpr SkScalar kThickness = 8;
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int count = (height / (2 * kRadius + kMargin));
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height = count * (2 * kRadius + kMargin);
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bm->allocN32Pixels(2 * (kRadius + kMargin), height);
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SkRandom random;
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SkCanvas wholeCanvas(*bm);
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wholeCanvas.clear(0x00000000);
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SkScalar angle = kStartAngle;
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for (int i = 0; i < count; ++i) {
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SkPaint paint;
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// The sw rasterizer disables AA for large canvii. So we make a small canvas for each draw.
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SkBitmap smallBM;
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SkIRect subRect = SkIRect::MakeXYWH(0, i * (kMargin + 2 * kRadius),
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2 * kRadius + kMargin, 2 * kRadius + kMargin);
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bm->extractSubset(&smallBM, subRect);
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SkCanvas canvas(smallBM);
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canvas.translate(kMargin + kRadius, kMargin + kRadius);
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paint.setAntiAlias(true);
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paint.setColor(random.nextU() | 0xFF000000);
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setStrokeWidth(kThickness);
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paint.setStrokeCap(SkPaint::kRound_Cap);
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SkScalar radius = kRadius - kThickness / 2;
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SkRect bounds = SkRect::MakeLTRB(-radius, -radius, radius, radius);
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canvas.drawArc(bounds, angle, kSweep, false, paint);
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angle += kDAngle;
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}
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bm->setImmutable();
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return count;
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}
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class TallStretchedBitmapsGM : public skiagm::GM {
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public:
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TallStretchedBitmapsGM() {}
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protected:
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SkString onShortName() override {
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return SkString("tall_stretched_bitmaps");
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}
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SkISize onISize() override {
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return SkISize::Make(730, 690);
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}
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void onOnceBeforeDraw() override {
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for (size_t i = 0; i < SK_ARRAY_COUNT(fTallBmps); ++i) {
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int h = SkToInt((4 + i) * 1024);
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fTallBmps[i].fItemCnt = make_bm(&fTallBmps[i].fBmp, h);
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}
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}
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void onDraw(SkCanvas* canvas) override {
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canvas->scale(1.3f, 1.3f);
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for (size_t i = 0; i < SK_ARRAY_COUNT(fTallBmps); ++i) {
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SkASSERT(fTallBmps[i].fItemCnt > 10);
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SkBitmap bmp = fTallBmps[i].fBmp;
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// Draw the last 10 elements of the bitmap.
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int startItem = fTallBmps[i].fItemCnt - 10;
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int itemHeight = bmp.height() / fTallBmps[i].fItemCnt;
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SkIRect subRect = SkIRect::MakeLTRB(0, startItem * itemHeight,
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bmp.width(), bmp.height());
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SkRect dstRect = SkRect::MakeWH(SkIntToScalar(bmp.width()), 10.f * itemHeight);
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canvas->drawImageRect(bmp.asImage(), SkRect::Make(subRect), dstRect,
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SkSamplingOptions(SkFilterMode::kLinear), nullptr,
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SkCanvas::kStrict_SrcRectConstraint);
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canvas->translate(SkIntToScalar(bmp.width() + 10), 0);
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}
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}
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private:
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struct {
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SkBitmap fBmp;
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int fItemCnt;
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} fTallBmps[8];
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using INHERITED = skiagm::GM;
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};
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//////////////////////////////////////////////////////////////////////////////
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DEF_GM(return new TallStretchedBitmapsGM;)
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