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115 lines
3.7 KiB
115 lines
3.7 KiB
4 months ago
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/*
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* Copyright 2015 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 "include/core/SkCanvas.h"
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#include "include/core/SkColorFilter.h"
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#include "include/core/SkColorPriv.h"
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#include "include/core/SkFont.h"
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#include "include/core/SkImage.h"
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#include "include/core/SkTime.h"
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#include "include/core/SkTypeface.h"
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#include "include/utils/SkRandom.h"
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#include "samplecode/Sample.h"
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#include "src/utils/SkUTF.h"
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#if SK_SUPPORT_GPU
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#include "include/gpu/GrDirectContext.h"
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#include "src/gpu/GrDirectContextPriv.h"
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#endif
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SkRandom gRand;
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static void DrawTheText(SkCanvas* canvas, const char text[], size_t length, SkScalar x, SkScalar y,
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const SkFont& font, const SkPaint& paint) {
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SkFont f(font);
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f.setSubpixel(true);
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canvas->drawSimpleText(text, length, SkTextEncoding::kUTF8, x, y, f, paint);
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}
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// This sample demonstrates the cache behavior of bitmap vs. distance field text
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// It renders variously sized text with an animated scale and rotation.
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// Specifically one should:
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// use 'D' to toggle between bitmap and distance field fonts
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// use '2' to toggle between scaling the image by 2x
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// -- this feature boosts the rendering out of the small point-size
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// SDF-text special case (which falls back to bitmap fonts for small points)
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class AnimatedTextView : public Sample {
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float fScale = 1;
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float fScaleInc = 0.1f;
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float fRotation = 0;
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int fSizeScale = 1;
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SkString name() override { return SkString("AnimatedText"); }
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bool onChar(SkUnichar uni) override {
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if ('2' == uni) {
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if (fSizeScale == 2) {
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fSizeScale = 1;
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} else {
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fSizeScale = 2;
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}
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return true;
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}
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return false;
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}
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void onDrawContent(SkCanvas* canvas) override {
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SkFont font(SkTypeface::MakeFromFile("/skimages/samplefont.ttf"));
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SkPaint paint;
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paint.setAntiAlias(true);
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canvas->save();
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#if SK_SUPPORT_GPU
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auto direct = GrAsDirectContext(canvas->recordingContext());
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if (direct) {
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SkSamplingOptions sampling(SkFilterMode::kLinear, SkMipmapMode::kNearest);
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sk_sp<SkImage> image = direct->priv().testingOnly_getFontAtlasImage(
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GrMaskFormat::kA8_GrMaskFormat);
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const SkRect rect = SkRect::MakeXYWH(512.0f, 10.0f, 512.0f, 512.0f);
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canvas->drawImageRect(image.get(), rect, rect, sampling, &paint,
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SkCanvas::kFast_SrcRectConstraint);
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}
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#endif
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canvas->translate(180, 180);
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canvas->rotate(fRotation);
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canvas->scale(fScale, fScale);
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canvas->translate(-180, -180);
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const char* text = "Hamburgefons";
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size_t length = strlen(text);
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SkScalar y = SkIntToScalar(0);
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for (int i = 12; i <= 26; i++) {
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font.setSize(SkIntToScalar(i*fSizeScale));
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y += font.getSpacing();
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DrawTheText(canvas, text, length, SkIntToScalar(110), y, font, paint);
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}
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canvas->restore();
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font.setSize(16);
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}
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bool onAnimate(double nanos) override {
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// TODO: use nanos
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// We add noise to the scale and rotation animations to
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// keep the font atlas from falling into a steady state
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fRotation += (1.0f + gRand.nextRangeF(-0.1f, 0.1f));
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fScale += (fScaleInc + gRand.nextRangeF(-0.025f, 0.025f));
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if (fScale >= 2.0f) {
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fScaleInc = -0.1f;
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} else if (fScale <= 1.0f) {
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fScaleInc = 0.1f;
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}
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return true;
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}
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};
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DEF_SAMPLE( return new AnimatedTextView(); )
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