90 lines
3.0 KiB
C++
90 lines
3.0 KiB
C++
/*
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* Copyright 2021 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/SkCanvas.h"
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#include "include/core/SkFont.h"
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#include "include/core/SkPaint.h"
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#include "include/core/SkRSXform.h"
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#include "include/core/SkSpan.h"
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#include "include/private/SkTDArray.h"
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#include "src/core/SkZip.h"
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#include "tools/ToolUtils.h"
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static const char gText[] = "Call me Ishmael. Some years ago—never mind how long precisely";
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class DrawGlyphsGM : public skiagm::GM {
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public:
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void onOnceBeforeDraw() override {
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fTypeface = ToolUtils::create_portable_typeface("serif", SkFontStyle());
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fFont = SkFont(fTypeface);
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fFont.setSubpixel(true);
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fFont.setSize(18);
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const size_t txtLen = strlen(gText);
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fGlyphCount = fFont.countText(gText, txtLen, SkTextEncoding::kUTF8);
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fGlyphs.append(fGlyphCount);
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fFont.textToGlyphs(gText, txtLen, SkTextEncoding::kUTF8, fGlyphs.begin(), fGlyphCount);
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fPositions.append(fGlyphCount);
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fFont.getPos(fGlyphs.begin(), fGlyphCount, fPositions.begin());
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auto positions = SkMakeSpan(fPositions.begin(), fGlyphCount);
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fLength = positions.back().x() - positions.front().x();
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fRadius = fLength / SK_FloatPI;
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fXforms.append(fGlyphCount);
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for (auto [xform, pos] : SkMakeZip(fXforms.begin(), positions)) {
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const SkScalar lengthToGlyph = pos.x() - positions.front().x();
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const SkScalar angle = SK_FloatPI * (fLength - lengthToGlyph) / fLength;
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const SkScalar cos = std::cos(angle);
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const SkScalar sin = std::sin(angle);
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xform = SkRSXform::Make(sin, cos, fRadius*cos, -fRadius*sin);
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}
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}
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SkString onShortName() override {
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return SkString("drawglyphs");
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}
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SkISize onISize() override {
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return SkISize::Make(640, 480);
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}
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void onDraw(SkCanvas* canvas) override {
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canvas->drawGlyphs(fGlyphCount, fGlyphs.begin(), fPositions.begin(), {50, 100}, fFont,
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SkPaint{});
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canvas->drawGlyphs(fGlyphCount, fGlyphs.begin(), fPositions.begin(), {50, 120}, fFont,
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SkPaint{});
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// Check bounding box calculation.
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for (auto& pos : fPositions) {
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pos += {0, -500};
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}
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canvas->drawGlyphs(fGlyphCount, fGlyphs.begin(), fPositions.begin(), {50, 640}, fFont,
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SkPaint{});
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canvas->drawGlyphs(fGlyphCount, fGlyphs.begin(), fXforms.begin(),
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{50 + fLength / 2, 160 + fRadius}, fFont, SkPaint{});
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// TODO: add tests for cluster versions of drawGlyphs.
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}
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private:
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sk_sp<SkTypeface> fTypeface;
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SkFont fFont;
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SkTDArray<SkGlyphID> fGlyphs;
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SkTDArray<SkPoint> fPositions;
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SkTDArray<SkRSXform> fXforms;
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int fGlyphCount;
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SkScalar fRadius;
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SkScalar fLength;
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};
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DEF_GM(return new DrawGlyphsGM{};)
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