Add new GM, shadertext3. It would have revealed a bug in the GPU draw-large-text-as-path code path that was recently fixed.

R=reed@google.com
Review URL: https://codereview.appspot.com/6638057

git-svn-id: http://skia.googlecode.com/svn/trunk@5932 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 144 insertions, 0 deletions

diff --git a/gm/shadertext3.cpp b/gm/shadertext3.cpp
new file mode 100644
index 0000000000..22d93cbc13
--- /dev/null
+++ b/gm/shadertext3.cpp
@@ -0,0 +1,144 @@
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#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));
+    static const SkPoint     kPts0[] = { { 0, 0 }, { s, s } };
+    static const SkPoint     kPts1[] = { { s/2, 0 }, { s/2, s } };
+    static const SkScalar    kPos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
+    static const SkColor kColors0[] = {0x80F00080, 0xF0F08000, 0x800080F0 };
+    static const SkColor kColors1[] = {0xF08000F0, 0x8080F000, 0xF000F080 };
+   
+
+    SkPaint     paint;
+
+    SkUnitMapper*   um = NULL;
+
+    um = new SkCosineMapper;
+
+    SkAutoUnref au(um);
+
+    paint.setShader(SkGradientShader::CreateLinear(kPts0, kColors0, kPos,
+                    SK_ARRAY_COUNT(kColors0), SkShader::kClamp_TileMode, um))->unref();
+    canvas.drawPaint(paint);
+    paint.setShader(SkGradientShader::CreateLinear(kPts1, kColors1, kPos,
+                    SK_ARRAY_COUNT(kColors1), SkShader::kClamp_TileMode))->unref();
+    canvas.drawPaint(paint);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+struct LabeledMatrix {
+    SkMatrix    fMatrix;
+    const char* fLabel;
+};
+
+class ShaderText3GM : public GM {
+public:
+    ShaderText3GM() {
+        this->setBGColor(0xFFDDDDDD);
+    }
+
+protected:
+
+    SkString onShortName() {
+        return SkString("shadertext3");
+    }
+
+    SkISize onISize() { return make_isize(800, 1000); }
+
+    virtual void onDraw(SkCanvas* canvas) {
+        static const char kText[] = "B";
+        static const int kTextLen = SK_ARRAY_COUNT(kText) - 1;
+        static const int kPointSize = 300;
+
+        static SkBitmap bmp;
+        if (bmp.isNull()) {
+            makebm(&bmp, SkBitmap::kARGB_8888_Config, kPointSize / 4, kPointSize / 4);
+        }
+        
+        SkPaint bmpPaint;
+        bmpPaint.setAntiAlias(true);
+        bmpPaint.setFilterBitmap(true);
+        bmpPaint.setAlpha(0x80);
+        canvas->drawBitmap(bmp, 5.f, 5.f, &bmpPaint);
+
+        SkPaint outlinePaint;
+        outlinePaint.setAntiAlias(true);
+        outlinePaint.setTextSize(SkIntToScalar(kPointSize));
+        outlinePaint.setStyle(SkPaint::kStroke_Style);
+        outlinePaint.setStrokeWidth(0.f);
+        
+        canvas->translate(15.f, 15.f);
+       
+        // draw glyphs scaled up
+        canvas->scale(2.f, 2.f);
+
+        static const SkShader::TileMode kTileModes[] = {
+            SkShader::kRepeat_TileMode,
+            SkShader::kMirror_TileMode,
+        };
+        
+        // position the baseline of the first run
+        canvas->translate(0.f, 0.75f * kPointSize);
+        
+        canvas->save();
+        int i = 0;
+        for (size_t tm0 = 0; tm0 < SK_ARRAY_COUNT(kTileModes); ++tm0) {        
+            for (size_t tm1 = 0; tm1 < SK_ARRAY_COUNT(kTileModes); ++tm1) {
+                SkAutoTUnref<SkShader> shader(SkShader::CreateBitmapShader(bmp,
+                                                                           kTileModes[tm0],
+                                                                           kTileModes[tm1]));
+                SkMatrix localM;
+                localM.setTranslate(5.f, 5.f);
+                localM.postRotate(20);
+                localM.postScale(1.15f, .85f);
+                shader->setLocalMatrix(localM);
+
+                SkPaint fillPaint;
+                fillPaint.setAntiAlias(true);
+                fillPaint.setTextSize(SkIntToScalar(kPointSize));
+                fillPaint.setFilterBitmap(true);
+                fillPaint.setShader(shader);
+
+                canvas->drawText(kText, kTextLen, 0, 0, fillPaint);
+                canvas->drawText(kText, kTextLen, 0, 0, outlinePaint);
+                int w = fillPaint.measureText(kText, kTextLen);
+                canvas->translate(w + 10.f, 0.f);
+                ++i;
+                if (!(i % 2)) {
+                    canvas->restore();
+                    canvas->translate(0, 0.75f * kPointSize);
+                    canvas->save();
+                }
+            }
+        }
+        canvas->restore();
+    }
+
+private:
+    typedef GM INHERITED;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef SK_BUILD_FOR_ANDROID
+static GM* MyFactory(void*) { return new ShaderText3GM; }
+static GMRegistry reg(MyFactory);
+#endif
+}