| #include "gm.h" |
| #include "SkCanvas.h" |
| #include "SkGradientShader.h" |
| #include "SkUnitMappers.h" |
| |
| namespace skiagm { |
| |
| static void makebm(SkBitmap* bm, SkBitmap::Config config, int w, int h) { |
| bm->setConfig(config, w, h); |
| bm->allocPixels(); |
| bm->eraseColor(0); |
| |
| SkCanvas canvas(*bm); |
| SkScalar s = SkIntToScalar(SkMin32(w, h)); |
| SkPoint pts[] = { { 0, 0 }, { s, s } }; |
| SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE }; |
| SkScalar pos[] = { 0, SK_Scalar1/2, SK_Scalar1 }; |
| SkPaint paint; |
| |
| SkUnitMapper* um = NULL; |
| |
| um = new SkCosineMapper; |
| |
| SkAutoUnref au(um); |
| |
| paint.setDither(true); |
| paint.setShader(SkGradientShader::CreateLinear(pts, colors, pos, |
| SK_ARRAY_COUNT(colors), SkShader::kClamp_TileMode, um))->unref(); |
| canvas.drawPaint(paint); |
| } |
| |
| SkShader* MakeBitmapShader(SkShader::TileMode tx, SkShader::TileMode ty, |
| int w, int h) { |
| static SkBitmap bmp; |
| if (bmp.isNull()) { |
| makebm(&bmp, SkBitmap::kARGB_8888_Config, w/2, h/4); |
| } |
| return SkShader::CreateBitmapShader(bmp, tx, ty); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| struct GradData { |
| int fCount; |
| const SkColor* fColors; |
| const SkScalar* fPos; |
| }; |
| |
| static const SkColor gColors[] = { |
| SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK |
| }; |
| |
| static const GradData gGradData[] = { |
| { 2, gColors, NULL }, |
| { 5, gColors, NULL }, |
| }; |
| |
| static SkShader* MakeLinear(const SkPoint pts[2], const GradData& data, |
| SkShader::TileMode tm, SkUnitMapper* mapper) { |
| return SkGradientShader::CreateLinear(pts, data.fColors, data.fPos, |
| data.fCount, tm, mapper); |
| } |
| |
| static SkShader* MakeRadial(const SkPoint pts[2], const GradData& data, |
| SkShader::TileMode tm, SkUnitMapper* mapper) { |
| SkPoint center; |
| center.set(SkScalarAve(pts[0].fX, pts[1].fX), |
| SkScalarAve(pts[0].fY, pts[1].fY)); |
| return SkGradientShader::CreateRadial(center, center.fX, data.fColors, |
| data.fPos, data.fCount, tm, mapper); |
| } |
| |
| static SkShader* MakeSweep(const SkPoint pts[2], const GradData& data, |
| SkShader::TileMode tm, SkUnitMapper* mapper) { |
| SkPoint center; |
| center.set(SkScalarAve(pts[0].fX, pts[1].fX), |
| SkScalarAve(pts[0].fY, pts[1].fY)); |
| return SkGradientShader::CreateSweep(center.fX, center.fY, data.fColors, |
| data.fPos, data.fCount, mapper); |
| } |
| |
| static SkShader* Make2Radial(const SkPoint pts[2], const GradData& data, |
| SkShader::TileMode tm, SkUnitMapper* mapper) { |
| SkPoint center0, center1; |
| center0.set(SkScalarAve(pts[0].fX, pts[1].fX), |
| SkScalarAve(pts[0].fY, pts[1].fY)); |
| center1.set(SkScalarInterp(pts[0].fX, pts[1].fX, SkIntToScalar(3)/5), |
| SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4)); |
| return SkGradientShader::CreateTwoPointRadial( |
| center1, (pts[1].fX - pts[0].fX) / 7, |
| center0, (pts[1].fX - pts[0].fX) / 2, |
| data.fColors, data.fPos, data.fCount, tm, mapper); |
| } |
| |
| typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data, |
| SkShader::TileMode tm, SkUnitMapper* mapper); |
| static const GradMaker gGradMakers[] = { |
| MakeLinear, MakeRadial, MakeSweep, Make2Radial |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| class ShaderTextGM : public GM { |
| public: |
| ShaderTextGM() {} |
| |
| protected: |
| |
| SkString onShortName() { |
| return SkString("shadertext"); |
| } |
| |
| SkISize onISize() { return make_isize(1450, 500); } |
| |
| void drawBG(SkCanvas* canvas) { |
| canvas->drawColor(0xFFDDDDDD); |
| } |
| |
| virtual void onDraw(SkCanvas* canvas) { |
| this->drawBG(canvas); |
| |
| const char text[] = "Shaded Text"; |
| const int textLen = SK_ARRAY_COUNT(text) - 1; |
| const int pointSize = 36; |
| |
| int w = pointSize * textLen; |
| int h = pointSize; |
| |
| SkPoint pts[2] = { |
| { 0, 0 }, |
| { SkIntToScalar(w), SkIntToScalar(h) } |
| }; |
| SkScalar textBase = SkIntToScalar(h/2); |
| |
| SkShader::TileMode tileModes[] = { |
| SkShader::kClamp_TileMode, |
| SkShader::kRepeat_TileMode, |
| SkShader::kMirror_TileMode |
| }; |
| |
| static const int gradCount = SK_ARRAY_COUNT(gGradData) * |
| SK_ARRAY_COUNT(gGradMakers); |
| static const int bmpCount = SK_ARRAY_COUNT(tileModes) * |
| SK_ARRAY_COUNT(tileModes); |
| SkShader* shaders[gradCount + bmpCount]; |
| |
| int shdIdx = 0; |
| for (size_t d = 0; d < SK_ARRAY_COUNT(gGradData); ++d) { |
| for (size_t m = 0; m < SK_ARRAY_COUNT(gGradMakers); ++m) { |
| shaders[shdIdx++] = gGradMakers[m](pts, |
| gGradData[d], |
| SkShader::kClamp_TileMode, |
| NULL); |
| } |
| } |
| for (size_t tx = 0; tx < SK_ARRAY_COUNT(tileModes); ++tx) { |
| for (size_t ty = 0; ty < SK_ARRAY_COUNT(tileModes); ++ty) { |
| shaders[shdIdx++] = MakeBitmapShader(tileModes[tx], |
| tileModes[ty], |
| w/8, h); |
| } |
| } |
| |
| SkPaint paint; |
| paint.setDither(true); |
| paint.setAntiAlias(true); |
| paint.setTextSize(SkIntToScalar(pointSize)); |
| |
| canvas->save(); |
| canvas->translate(SkIntToScalar(20), SkIntToScalar(10)); |
| |
| SkPath path; |
| path.arcTo(SkRect::MakeXYWH(-40, 15, 300, 90), |
| SK_Scalar1 * 225, SK_Scalar1 * 90, false); |
| path.close(); |
| |
| static const int testsPerCol = 8; |
| static const int rowHeight = 60; |
| static const int colWidth = 300; |
| canvas->save(); |
| for (size_t s = 0; s < SK_ARRAY_COUNT(shaders); s++) { |
| canvas->save(); |
| int i = 2*s; |
| canvas->translate(SkIntToScalar((i / testsPerCol) * colWidth), |
| SkIntToScalar((i % testsPerCol) * rowHeight)); |
| paint.setShader(shaders[s])->unref(); |
| canvas->drawText(text, textLen, 0, textBase, paint); |
| canvas->restore(); |
| canvas->save(); |
| ++i; |
| canvas->translate(SkIntToScalar((i / testsPerCol) * colWidth), |
| SkIntToScalar((i % testsPerCol) * rowHeight)); |
| canvas->drawTextOnPath(text, textLen, path, NULL, paint); |
| canvas->restore(); |
| } |
| canvas->restore(); |
| |
| } |
| |
| private: |
| typedef GM INHERITED; |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| static GM* MyFactory(void*) { return new ShaderTextGM; } |
| static GMRegistry reg(MyFactory); |
| |
| } |