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Diffstat (limited to 'gm/shadertext.cpp')
| -rw-r--r-- | gm/shadertext.cpp | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/gm/shadertext.cpp b/gm/shadertext.cpp new file mode 100644 index 0000000..1cf562c --- /dev/null +++ b/gm/shadertext.cpp @@ -0,0 +1,198 @@ +#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 = w < h ? 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(950, 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; + static int pointSize = SkIntToScalar(48); + + 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)); + + 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(); + canvas->translate(SkIntToScalar((s / testsPerCol) * colWidth), + SkIntToScalar((s % testsPerCol) * rowHeight)); + paint.setShader(shaders[s])->ref(); + canvas->drawText(text, textLen, 0, textBase, paint); + canvas->restore(); + } + canvas->restore(); + } + +private: + typedef GM INHERITED; +}; + +/////////////////////////////////////////////////////////////////////////////// + +static GM* MyFactory(void*) { return new ShaderTextGM; } +static GMRegistry reg(MyFactory); + +} + + |