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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 
     10 #include "Resources.h"
     11 #include "SkCanvas.h"
     12 #include "SkStream.h"
     13 #include "SkTypeface.h"
     14 
     15 namespace skiagm {
     16 
     17 class ColorEmojiGM : public GM {
     18 public:
     19     ColorEmojiGM() {
     20         fTypeface = NULL;
     21     }
     22 
     23     ~ColorEmojiGM() {
     24         SkSafeUnref(fTypeface);
     25     }
     26 protected:
     27     virtual uint32_t onGetFlags() const SK_OVERRIDE {
     28         return kSkipTiled_Flag;
     29     }
     30 
     31     virtual void onOnceBeforeDraw() SK_OVERRIDE {
     32         SkString filename = GetResourcePath();
     33         filename.append("/Funkster.ttf");
     34 
     35         SkAutoTUnref<SkFILEStream> stream(new SkFILEStream(filename.c_str()));
     36         if (!stream->isValid()) {
     37             SkDebugf("Could not find Funkster.ttf, please set --resourcePath correctly.\n");
     38             return;
     39         }
     40 
     41         fTypeface = SkTypeface::CreateFromStream(stream);
     42     }
     43 
     44     virtual SkString onShortName() {
     45         return SkString("coloremoji");
     46     }
     47 
     48     virtual SkISize onISize() {
     49         return SkISize::Make(640, 480);
     50     }
     51 
     52     virtual void onDraw(SkCanvas* canvas) {
     53 
     54         canvas->drawColor(SK_ColorGRAY);
     55 
     56         SkPaint paint;
     57         paint.setTypeface(fTypeface);
     58 
     59         const char* text = "hamburgerfons";
     60 
     61         // draw text at different point sizes
     62         const int textSize[] = { 10, 30, 50 };
     63         const int textYOffset[] = { 10, 40, 100};
     64         SkASSERT(sizeof(textSize) == sizeof(textYOffset));
     65         for (size_t y = 0; y < sizeof(textSize) / sizeof(int); ++y) {
     66             paint.setTextSize(SkIntToScalar(textSize[y]));
     67             canvas->drawText(text, strlen(text), 10, SkIntToScalar(textYOffset[y]), paint);
     68         }
     69 
     70         // setup work needed to draw text with different clips
     71         canvas->translate(10, 160);
     72         paint.setTextSize(40);
     73 
     74         // compute the bounds of the text
     75         SkRect bounds;
     76         paint.measureText(text, strlen(text), &bounds);
     77 
     78         const SkScalar boundsHalfWidth = bounds.width() * SK_ScalarHalf;
     79         const SkScalar boundsHalfHeight = bounds.height() * SK_ScalarHalf;
     80         const SkScalar boundsQuarterWidth = boundsHalfWidth * SK_ScalarHalf;
     81         const SkScalar boundsQuarterHeight = boundsHalfHeight * SK_ScalarHalf;
     82 
     83         SkRect upperLeftClip = SkRect::MakeXYWH(bounds.left(), bounds.top(),
     84                                                 boundsHalfWidth, boundsHalfHeight);
     85         SkRect lowerRightClip = SkRect::MakeXYWH(bounds.centerX(), bounds.centerY(),
     86                                                  boundsHalfWidth, boundsHalfHeight);
     87         SkRect interiorClip = bounds;
     88         interiorClip.inset(boundsQuarterWidth, boundsQuarterHeight);
     89 
     90         const SkRect clipRects[] = { bounds, upperLeftClip, lowerRightClip, interiorClip };
     91 
     92         SkPaint clipHairline;
     93         clipHairline.setColor(SK_ColorWHITE);
     94         clipHairline.setStyle(SkPaint::kStroke_Style);
     95 
     96         for (size_t x = 0; x < sizeof(clipRects) / sizeof(SkRect); ++x) {
     97             canvas->save();
     98             canvas->drawRect(clipRects[x], clipHairline);
     99             paint.setAlpha(0x20);
    100             canvas->drawText(text, strlen(text), 0, 0, paint);
    101             canvas->clipRect(clipRects[x]);
    102             paint.setAlpha(0xFF);
    103             canvas->drawText(text, strlen(text), 0, 0, paint);
    104             canvas->restore();
    105             canvas->translate(0, bounds.height() + SkIntToScalar(25));
    106         }
    107     }
    108 
    109 private:
    110     SkTypeface* fTypeface;
    111 
    112     typedef GM INHERITED;
    113 };
    114 
    115 //////////////////////////////////////////////////////////////////////////////
    116 
    117 static GM* MyFactory(void*) { return new ColorEmojiGM; }
    118 static GMRegistry reg(MyFactory);
    119 
    120 }
    121