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      1 /*
      2  * Copyright 2013 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #include "gm.h"
      9 #include "SkCanvas.h"
     10 #include "SkStream.h"
     11 #include "SkTypeface.h"
     12 
     13 namespace skiagm {
     14 
     15 class ColorEmojiGM : public GM {
     16 public:
     17     ColorEmojiGM() {
     18         fTypeface = NULL;
     19     }
     20 
     21     ~ColorEmojiGM() {
     22         SkSafeUnref(fTypeface);
     23     }
     24 protected:
     25     virtual void onOnceBeforeDraw() SK_OVERRIDE {
     26 
     27         SkString filename(INHERITED::gResourcePath);
     28         filename.append("/Funkster.ttf");
     29 
     30         SkAutoTUnref<SkFILEStream> stream(new SkFILEStream(filename.c_str()));
     31         if (!stream->isValid()) {
     32             SkDebugf("Could not find Funkster.ttf, please set --resourcePath correctly.\n");
     33             return;
     34         }
     35 
     36         fTypeface = SkTypeface::CreateFromStream(stream);
     37     }
     38 
     39     virtual SkString onShortName() {
     40         return SkString("coloremoji");
     41     }
     42 
     43     virtual SkISize onISize() {
     44         return make_isize(640, 480);
     45     }
     46 
     47     virtual void onDraw(SkCanvas* canvas) {
     48 
     49         canvas->drawColor(SK_ColorGRAY);
     50 
     51         SkPaint paint;
     52         paint.setTypeface(fTypeface);
     53 
     54         const char* text = "hamburgerfons";
     55 
     56         // draw text at different point sizes
     57         const int textSize[] = { 10, 30, 50 };
     58         const int textYOffset[] = { 10, 40, 100};
     59         SkASSERT(sizeof(textSize) == sizeof(textYOffset));
     60         for (size_t y = 0; y < sizeof(textSize) / sizeof(int); ++y) {
     61             paint.setTextSize(SkIntToScalar(textSize[y]));
     62             canvas->drawText(text, strlen(text), 10, SkIntToScalar(textYOffset[y]), paint);
     63         }
     64 
     65         // setup work needed to draw text with different clips
     66         canvas->translate(10, 160);
     67         paint.setTextSize(40);
     68 
     69         // compute the bounds of the text
     70         SkRect bounds;
     71         paint.measureText(text, strlen(text), &bounds);
     72 
     73         const SkScalar boundsHalfWidth = bounds.width() * SK_ScalarHalf;
     74         const SkScalar boundsHalfHeight = bounds.height() * SK_ScalarHalf;
     75         const SkScalar boundsQuarterWidth = boundsHalfWidth * SK_ScalarHalf;
     76         const SkScalar boundsQuarterHeight = boundsHalfHeight * SK_ScalarHalf;
     77 
     78         SkRect upperLeftClip = SkRect::MakeXYWH(bounds.left(), bounds.top(),
     79                                                 boundsHalfWidth, boundsHalfHeight);
     80         SkRect lowerRightClip = SkRect::MakeXYWH(bounds.centerX(), bounds.centerY(),
     81                                                  boundsHalfWidth, boundsHalfHeight);
     82         SkRect interiorClip = bounds;
     83         interiorClip.inset(boundsQuarterWidth, boundsQuarterHeight);
     84 
     85         const SkRect clipRects[] = { bounds, upperLeftClip, lowerRightClip, interiorClip };
     86 
     87         SkPaint clipHairline;
     88         clipHairline.setColor(SK_ColorWHITE);
     89         clipHairline.setStyle(SkPaint::kStroke_Style);
     90 
     91         for (size_t x = 0; x < sizeof(clipRects) / sizeof(SkRect); ++x) {
     92             canvas->save();
     93             canvas->drawRect(clipRects[x], clipHairline);
     94             paint.setAlpha(0x20);
     95             canvas->drawText(text, strlen(text), 0, 0, paint);
     96             canvas->clipRect(clipRects[x]);
     97             paint.setAlpha(0xFF);
     98             canvas->drawText(text, strlen(text), 0, 0, paint);
     99             canvas->restore();
    100             canvas->translate(0, bounds.height() + SkIntToScalar(25));
    101         }
    102     }
    103 
    104 private:
    105     SkTypeface* fTypeface;
    106 
    107     typedef GM INHERITED;
    108 };
    109 
    110 //////////////////////////////////////////////////////////////////////////////
    111 
    112 #if !defined(SK_BUILD_FOR_ANDROID)
    113 // fail for now until the appropriate freetype changes are submitted
    114 static GM* MyFactory(void*) { return new ColorEmojiGM; }
    115 static GMRegistry reg(MyFactory);
    116 #endif
    117 
    118 }
    119