Add a test for color bitmap fonts.

gm/coloremoji.cpp

Index: gm/coloremoji.cpp
diff --git a/gm/coloremoji.cpp b/gm/coloremoji.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..8316a3851cd5a4cb87c6859d9f31341ac823e198
--- /dev/null
+++ b/gm/coloremoji.cpp
@@ -0,0 +1,116 @@
+/*
+ * Copyright 2013 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 "SkStream.h"
+#include "SkTypeface.h"
+
+namespace skiagm {
+
+class ColorEmojiGM : public GM {
+public:
+    ColorEmojiGM() {
+        fTypeface = NULL;
+    }
+
+    ~ColorEmojiGM() {
+        SkSafeUnref(fTypeface);
+    }
+protected:
+    virtual void onOnceBeforeDraw() SK_OVERRIDE {
+
+        SkString filename(INHERITED::gResourcePath);
+        filename.append("/Funkster.ttf");
+
+        SkAutoTUnref<SkFILEStream> stream(new SkFILEStream(filename.c_str()));
+        if (!stream->isValid()) {
+            SkDebugf("Could not find Funkster.ttf, please set --resourcePath correctly.\n");
+            return;
+        }
+
+        fTypeface = SkTypeface::CreateFromStream(stream);
+    }
+
+    virtual SkString onShortName() {
+        return SkString("coloremoji");
+    }
+
+    virtual SkISize onISize() {
+        return make_isize(640, 480);
+    }
+
+    virtual void onDraw(SkCanvas* canvas) {
+
+        canvas->drawColor(SK_ColorGRAY);
+
+        SkPaint paint;
+        paint.setTypeface(fTypeface);
+        paint.setEmbeddedBitmapText(true);
+
+        const char* text = "hamburgerfons";
+
+        // draw text at different point sizes
+        const int textSize[] = { 10, 30, 50 };
+        const int textYOffset[] = { 10, 40, 100};
+        SkASSERT(sizeof(textSize) == sizeof(textYOffset));
+        for (size_t y = 0; y < sizeof(textSize) / sizeof(int); ++y) {
+            paint.setTextSize(textSize[y]);
+            canvas->drawText(text, strlen(text), 10, textYOffset[y], paint);
+        }
+
+        // setup work needed to draw text with different clips
+        canvas->translate(10, 160);
+        paint.setTextSize(40);
+
+        // compute the bounds of the text
+        SkRect bounds;
+        paint.measureText(text, strlen(text), &bounds);
+
+        const SkScalar boundsHalfWidth = bounds.width() * SK_ScalarHalf;
+        const SkScalar boundsHalfHeight = bounds.height() * SK_ScalarHalf;
+        const SkScalar boundsQuarterWidth = boundsHalfWidth * SK_ScalarHalf;
+        const SkScalar boundsQuarterHeight = boundsHalfHeight * SK_ScalarHalf;
+
+        SkRect upperLeftClip = SkRect::MakeXYWH(bounds.left(), bounds.top(),
+                                                boundsHalfWidth, boundsHalfHeight);
+        SkRect lowerRightClip = SkRect::MakeXYWH(bounds.centerX(), bounds.centerY(),
+                                                 boundsHalfWidth, boundsHalfHeight);
+        SkRect interiorClip = bounds;
+        interiorClip.inset(boundsQuarterWidth, boundsQuarterHeight);
+
+        const SkRect clipRects[] = { bounds, upperLeftClip, lowerRightClip, interiorClip };
+
+        SkPaint clipHairline;
+        clipHairline.setColor(SK_ColorWHITE);
+        clipHairline.setStyle(SkPaint::kStroke_Style);
+
+        for (size_t x = 0; x < sizeof(clipRects) / sizeof(SkRect); ++x) {
+            canvas->save();
+            canvas->drawRect(clipRects[x], clipHairline);
+            paint.setAlpha(0x20);
+            canvas->drawText(text, strlen(text), 0, 0, paint);
+            canvas->clipRect(clipRects[x]);
+            paint.setAlpha(0xFF);
+            canvas->drawText(text, strlen(text), 0, 0, paint);
+            canvas->restore();
+            canvas->translate(0, bounds.height() + SkIntToScalar(25));
+        }
+    }
+
+private:
+    SkTypeface* fTypeface;
+
+    typedef GM INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static GM* MyFactory(void*) { return new ColorEmojiGM; }
+static GMRegistry reg(MyFactory);
+
+}