зеркало из https://github.com/mozilla/moz-skia.git
123 строки
3.2 KiB
C++
123 строки
3.2 KiB
C++
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/*
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* Copyright 2011 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 "SampleCode.h"
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#include "SkView.h"
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#include "SkCanvas.h"
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#include "SkGradientShader.h"
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#include "SkPath.h"
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#include "SkRegion.h"
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#include "SkShader.h"
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#include "SkUtils.h"
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#include "Sk1DPathEffect.h"
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#include "SkCornerPathEffect.h"
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#include "SkPathMeasure.h"
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#include "SkRandom.h"
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#include "SkColorPriv.h"
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#include "SkColorFilter.h"
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#include "SkDither.h"
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// exercise scale/linear/devkern
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struct Setting {
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SkScalar fScale;
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bool fLinearText;
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bool fDevKernText;
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};
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static const SkScalar ONE = SkIntToScalar(9999)/10000;
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static const Setting gSettings[] = {
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{ 0, false, false },
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{ 0, false, true },
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{ 0, true, false },
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{ 0, true, true },
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{ ONE, false, false },
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{ ONE, false, true },
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{ ONE, true, false },
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{ ONE, true, true }
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};
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static void doMeasure(SkCanvas* canvas, const SkPaint& paint, const char text[]) {
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SkScalar dy = paint.getFontMetrics(NULL);
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size_t len = strlen(text);
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SkAutoTMalloc<SkScalar> autoWidths(len);
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SkScalar* widths = autoWidths.get();
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SkAutoTMalloc<SkRect> autoRects(len);
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SkRect* rects = autoRects.get();
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SkRect bounds;
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SkPaint p(paint);
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for (size_t i = 0; i < SK_ARRAY_COUNT(gSettings); i++) {
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p.setLinearText(gSettings[i].fLinearText);
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p.setDevKernText(gSettings[i].fDevKernText);
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SkScalar scale = gSettings[i].fScale;
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int n = p.getTextWidths(text, len, widths, rects);
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SkScalar w = p.measureText(text, len, &bounds, scale);
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p.setStyle(SkPaint::kFill_Style);
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p.setColor(0x8888FF88);
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canvas->drawRect(bounds, p);
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p.setColor(0xFF000000);
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canvas->drawText(text, len, 0, 0, p);
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p.setStyle(SkPaint::kStroke_Style);
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p.setStrokeWidth(0);
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p.setColor(0xFFFF0000);
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SkScalar x = 0;
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for (int j = 0; j < n; j++) {
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SkRect r = rects[j];
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r.offset(x, 0);
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canvas->drawRect(r, p);
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x += widths[j];
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}
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p.setColor(0xFF0000FF);
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canvas->drawLine(0, 0, w, 0, p);
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p.setStrokeWidth(SkIntToScalar(4));
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canvas->drawPoint(x, 0, p);
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canvas->translate(0, dy);
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}
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}
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class MeasureView : public SampleView {
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public:
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SkPaint fPaint;
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MeasureView() {
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fPaint.setAntiAlias(true);
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fPaint.setTextSize(SkIntToScalar(64));
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this->setBGColor(0xFFDDDDDD);
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}
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protected:
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// overrides from SkEventSink
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virtual bool onQuery(SkEvent* evt) {
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if (SampleCode::TitleQ(*evt)) {
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SampleCode::TitleR(evt, "Measure");
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return true;
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}
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return this->INHERITED::onQuery(evt);
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}
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virtual void onDrawContent(SkCanvas* canvas) {
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canvas->translate(fPaint.getTextSize(), fPaint.getTextSize());
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doMeasure(canvas, fPaint, "Hamburgefons");
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}
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private:
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typedef SampleView INHERITED;
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};
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//////////////////////////////////////////////////////////////////////////////
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static SkView* MyFactory() { return new MeasureView; }
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static SkViewRegister reg(MyFactory);
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