60 lines
2.0 KiB
C++
60 lines
2.0 KiB
C++
/*
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* Copyright 2021 Google LLC.
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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/SkPaint.h"
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#include "include/core/SkPath.h"
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#include "include/gpu/GrContextOptions.h"
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namespace skiagm {
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class BatchedConvexPathsGM : public GM {
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private:
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SkString onShortName() override { return SkString("batchedconvexpaths"); }
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SkISize onISize() override { return SkISize::Make(512, 512); }
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void modifyGrContextOptions(GrContextOptions* ctxOptions) override {
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// Ensure our paths don't go through the atlas path renderer.
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ctxOptions->fGpuPathRenderers &= ~GpuPathRenderers::kAtlas;
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}
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DrawResult onDraw(SkCanvas* canvas, SkString* errorMsg) override {
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canvas->clear(SK_ColorBLACK);
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for (uint32_t i = 0; i < 10; ++i) {
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SkAutoCanvasRestore acr(canvas, true);
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int numPoints = (i + 3) * 3;
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SkPath path;
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path.moveTo(1, 0);
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for (float j = 1; j < numPoints; j += 3) {
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constexpr float k2PI = SK_ScalarPI * 2;
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path.cubicTo(cosf(j/numPoints * k2PI), sinf(j/numPoints * k2PI),
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cosf((j+1)/numPoints * k2PI), sinf((j+1)/numPoints * k2PI),
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j+2 == numPoints ? 1 : cosf((j+2)/numPoints * k2PI),
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j+2 == numPoints ? 0 : sinf((j+2)/numPoints * k2PI));
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}
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float scale = 256 - i*24;
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canvas->translate(scale + (256 - scale) * .33f, scale + (256 - scale) * .33f);
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canvas->scale(scale, scale);
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SkPaint paint;
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paint.setColor(((i + 123458383u) * 285018463u) | 0xff808080);
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paint.setAlphaf(0.3f);
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paint.setAntiAlias(true);
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canvas->drawPath(path, paint);
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}
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return DrawResult::kOk;
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}
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};
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DEF_GM( return new BatchedConvexPathsGM; )
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} // namespace skiagm
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