зеркало из https://github.com/mozilla/moz-skia.git
131 строка
5.0 KiB
C++
131 строка
5.0 KiB
C++
/*
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* Copyright 2013 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.h"
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#include "SkGradientShader.h"
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using namespace skiagm;
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struct GradData {
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int fCount;
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const SkColor* fColors;
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const SkScalar* fPos;
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};
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static const SkColor gColors[] = {
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SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE,
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};
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static const GradData gGradData[] = {
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{ 1, gColors, NULL },
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{ 2, gColors, NULL },
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{ 3, gColors, NULL },
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{ 4, gColors, NULL },
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};
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static SkShader* MakeLinear(const SkPoint pts[2], const GradData& data,
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SkShader::TileMode tm, SkUnitMapper* mapper) {
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return SkGradientShader::CreateLinear(pts, data.fColors, data.fPos,
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data.fCount, tm, mapper);
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}
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static SkShader* MakeRadial(const SkPoint pts[2], const GradData& data,
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SkShader::TileMode tm, SkUnitMapper* mapper) {
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SkPoint center;
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center.set(SkScalarAve(pts[0].fX, pts[1].fX),
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SkScalarAve(pts[0].fY, pts[1].fY));
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return SkGradientShader::CreateRadial(center, center.fX, data.fColors,
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data.fPos, data.fCount, tm, mapper);
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}
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static SkShader* MakeSweep(const SkPoint pts[2], const GradData& data,
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SkShader::TileMode, SkUnitMapper* mapper) {
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SkPoint center;
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center.set(SkScalarAve(pts[0].fX, pts[1].fX),
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SkScalarAve(pts[0].fY, pts[1].fY));
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return SkGradientShader::CreateSweep(center.fX, center.fY, data.fColors,
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data.fPos, data.fCount, mapper);
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}
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static SkShader* Make2Radial(const SkPoint pts[2], const GradData& data,
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SkShader::TileMode tm, SkUnitMapper* mapper) {
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SkPoint center0, center1;
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center0.set(SkScalarAve(pts[0].fX, pts[1].fX),
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SkScalarAve(pts[0].fY, pts[1].fY));
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center1.set(SkScalarInterp(pts[0].fX, pts[1].fX, SkIntToScalar(3)/5),
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SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4));
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return SkGradientShader::CreateTwoPointRadial(
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center1, (pts[1].fX - pts[0].fX) / 7,
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center0, (pts[1].fX - pts[0].fX) / 2,
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data.fColors, data.fPos, data.fCount, tm, mapper);
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}
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static SkShader* Make2Conical(const SkPoint pts[2], const GradData& data,
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SkShader::TileMode tm, SkUnitMapper* mapper) {
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SkPoint center0, center1;
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SkScalar radius0 = SkScalarDiv(pts[1].fX - pts[0].fX, 10);
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SkScalar radius1 = SkScalarDiv(pts[1].fX - pts[0].fX, 3);
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center0.set(pts[0].fX + radius0, pts[0].fY + radius0);
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center1.set(pts[1].fX - radius1, pts[1].fY - radius1);
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return SkGradientShader::CreateTwoPointConical(center1, radius1,
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center0, radius0,
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data.fColors, data.fPos,
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data.fCount, tm, mapper);
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}
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typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data,
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SkShader::TileMode tm, SkUnitMapper* mapper);
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static const GradMaker gGradMakers[] = {
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MakeLinear, MakeRadial, MakeSweep, Make2Radial, Make2Conical,
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};
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///////////////////////////////////////////////////////////////////////////////
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class GradientsNoTextureGM : public GM {
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public:
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GradientsNoTextureGM() {
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this->setBGColor(0xFFDDDDDD);
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}
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protected:
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SkString onShortName() SK_OVERRIDE { return SkString("gradients_no_texture"); }
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virtual SkISize onISize() SK_OVERRIDE { return make_isize(640, 615); }
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virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
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static const SkPoint kPts[2] = { { 0, 0 },
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{ SkIntToScalar(50), SkIntToScalar(50) } };
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static const SkShader::TileMode kTM = SkShader::kClamp_TileMode;
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SkRect kRect = { 0, 0, SkIntToScalar(50), SkIntToScalar(50) };
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SkPaint paint;
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paint.setAntiAlias(true);
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canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
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static const uint8_t kAlphas[] = { 0xff, 0x40 };
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for (size_t a = 0; a < SK_ARRAY_COUNT(kAlphas); ++a) {
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for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); ++i) {
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canvas->save();
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for (size_t j = 0; j < SK_ARRAY_COUNT(gGradMakers); ++j) {
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SkShader* shader = gGradMakers[j](kPts, gGradData[i], kTM, NULL);
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paint.setShader(shader)->unref();
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paint.setAlpha(kAlphas[a]);
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canvas->drawRect(kRect, paint);
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canvas->translate(0, SkIntToScalar(kRect.height() + 20));
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}
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canvas->restore();
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canvas->translate(SkIntToScalar(kRect.width() + 20), 0);
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}
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}
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}
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private:
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typedef GM INHERITED;
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};
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///////////////////////////////////////////////////////////////////////////////
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DEF_GM( return SkNEW(GradientsNoTextureGM));
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