Add shaded text sample and gm test.
git-svn-id: http://skia.googlecode.com/svn/trunk@725 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SampleShaderText.cpp b/samplecode/SampleShaderText.cpp
new file mode 100644
index 0000000..36692d2
--- /dev/null
+++ b/samplecode/SampleShaderText.cpp
@@ -0,0 +1,199 @@
+#include "SampleCode.h"
+#include "SkView.h"
+#include "SkCanvas.h"
+#include "SkGradientShader.h"
+#include "SkUnitMappers.h"
+
+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 ShaderTextView : public SkView {
+public:
+ ShaderTextView() {}
+
+protected:
+ // overrides from SkEventSink
+ virtual bool onQuery(SkEvent* evt) {
+ if (SampleCode::TitleQ(*evt)) {
+ SampleCode::TitleR(evt, "Shader Text");
+ return true;
+ }
+ return this->INHERITED::onQuery(evt);
+ }
+
+ 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();
+
+ canvas->translate(0, SkIntToScalar(370));
+ this->inval(NULL);
+ }
+
+private:
+ typedef SkView INHERITED;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new ShaderTextView; }
+static SkViewRegister reg(MyFactory);
+