gm/mixedtextblobs.cpp

   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 "sk_tool_utils.h"
  10
  11 #include "Resources.h"
  12 #include "SkCanvas.h"
  13 #include "SkGradientShader.h"
  14 #include "SkStream.h"
  15 #include "SkTextBlob.h"
  16 #include "SkTypeface.h"
  17
  18 namespace skiagm {
  19
  20 static void draw_blob(SkCanvas* canvas, const SkTextBlob* blob, const SkPaint& skPaint,
  21                       const SkRect& clipRect) {
  22     SkPaint clipHairline;
  23     clipHairline.setColor(SK_ColorWHITE);
  24     clipHairline.setStyle(SkPaint::kStroke_Style);
  25
  26     SkPaint paint(skPaint);
  27     canvas->save();
  28     canvas->drawRect(clipRect, clipHairline);
  29     paint.setAlpha(0x20);
  30     canvas->drawTextBlob(blob, 0, 0, paint);
  31     canvas->clipRect(clipRect);
  32     paint.setAlpha(0xFF);
  33     canvas->drawTextBlob(blob, 0, 0, paint);
  34     canvas->restore();
  35 }
  36
  37 class MixedTextBlobsGM : public GM {
  38 public:
  39     MixedTextBlobsGM() { }
  40
  41 protected:
  42     void onOnceBeforeDraw() override {
  43         fEmojiTypeface = sk_tool_utils::emoji_typeface();
  44         fEmojiText = sk_tool_utils::emoji_sample_text();
  45         fReallyBigATypeface = MakeResourceAsTypeface("/fonts/ReallyBigA.ttf");
  46
  47         SkTextBlobBuilder builder;
  48
  49         // make textblob
  50         // Text so large we draw as paths
  51         SkPaint paint;
  52         paint.setTextSize(385);
  53         const char* text = "O";
  54         sk_tool_utils::set_portable_typeface(&paint);
  55
  56         SkRect bounds;
  57         paint.measureText(text, strlen(text), &bounds);
  58
  59         SkScalar yOffset = bounds.height();
  60         sk_tool_utils::add_to_text_blob(&builder, text, paint, 10, yOffset);
  61         SkScalar corruptedAx = bounds.width();
  62         SkScalar corruptedAy = yOffset;
  63
  64         const SkScalar boundsHalfWidth = bounds.width() * SK_ScalarHalf;
  65         const SkScalar boundsHalfHeight = bounds.height() * SK_ScalarHalf;
  66
  67         SkScalar xOffset = boundsHalfWidth;
  68         yOffset = boundsHalfHeight;
  69
  70         // LCD
  71         paint.setTextSize(32);
  72         text = "LCD!!!!!";
  73         paint.setAntiAlias(true);
  74         paint.setSubpixelText(true);
  75         paint.setLCDRenderText(true);
  76         paint.measureText(text, strlen(text), &bounds);
  77         sk_tool_utils::add_to_text_blob(&builder, text, paint, xOffset - bounds.width() * 0.25f,
  78                                         yOffset - bounds.height() * 0.5f);
  79         yOffset += bounds.height();
  80
  81         // color emoji
  82         if (fEmojiTypeface) {
  83             paint.setAntiAlias(false);
  84             paint.setSubpixelText(false);
  85             paint.setLCDRenderText(false);
  86             paint.setTypeface(fEmojiTypeface);
  87             text = fEmojiText;
  88             paint.measureText(text, strlen(text), &bounds);
  89             sk_tool_utils::add_to_text_blob(&builder, text, paint, xOffset - bounds.width() * 0.3f,
  90                                             yOffset);
  91         }
  92
  93         // Corrupted font
  94         paint.setTextSize(12);
  95         text = "aA";
  96         paint.setTypeface(fReallyBigATypeface);
  97         sk_tool_utils::add_to_text_blob(&builder, text, paint, corruptedAx, corruptedAy);
  98         fBlob = builder.make();
  99     }
 100
 101     SkString onShortName() override {
 102         SkString name("mixedtextblobs");
 103         name.append(sk_tool_utils::platform_os_emoji());
 104         return name;
 105     }
 106
 107     SkISize onISize() override {
 108         return SkISize::Make(kWidth, kHeight);
 109     }
 110
 111     void onDraw(SkCanvas* canvas) override {
 112
 113         canvas->drawColor(sk_tool_utils::color_to_565(SK_ColorGRAY));
 114
 115         SkPaint paint;
 116
 117         // setup work needed to draw text with different clips
 118         paint.setColor(SK_ColorBLACK);
 119         canvas->translate(10, 40);
 120
 121         paint.setTextSize(40);
 122
 123         // compute the bounds of the text and setup some clips
 124         SkRect bounds = fBlob->bounds();
 125
 126         const SkScalar boundsHalfWidth = bounds.width() * SK_ScalarHalf;
 127         const SkScalar boundsHalfHeight = bounds.height() * SK_ScalarHalf;
 128         const SkScalar boundsQuarterWidth = boundsHalfWidth * SK_ScalarHalf;
 129         const SkScalar boundsQuarterHeight = boundsHalfHeight * SK_ScalarHalf;
 130
 131         SkRect upperLeftClip = SkRect::MakeXYWH(bounds.left(), bounds.top(),
 132                                                 boundsHalfWidth, boundsHalfHeight);
 133         SkRect lowerRightClip = SkRect::MakeXYWH(bounds.centerX(), bounds.centerY(),
 134                                                  boundsHalfWidth, boundsHalfHeight);
 135         SkRect interiorClip = bounds;
 136         interiorClip.inset(boundsQuarterWidth, boundsQuarterHeight);
 137
 138         const SkRect clipRects[] = { bounds, upperLeftClip, lowerRightClip, interiorClip};
 139
 140         size_t count = sizeof(clipRects) / sizeof(SkRect);
 141         for (size_t x = 0; x < count; ++x) {
 142             draw_blob(canvas, fBlob.get(), paint, clipRects[x]);
 143             if (x == (count >> 1) - 1) {
 144                 canvas->translate(SkScalarFloorToScalar(bounds.width() + SkIntToScalar(25)),
 145                                   -(x * SkScalarFloorToScalar(bounds.height() +
 146                                     SkIntToScalar(25))));
 147             } else {
 148                 canvas->translate(0, SkScalarFloorToScalar(bounds.height() + SkIntToScalar(25)));
 149             }
 150         }
 151     }
 152
 153 private:
 154     sk_sp<SkTypeface> fEmojiTypeface;
 155     sk_sp<SkTypeface> fReallyBigATypeface;
 156     const char* fEmojiText;
 157     sk_sp<SkTextBlob> fBlob;
 158
 159     static constexpr int kWidth = 1250;
 160     static constexpr int kHeight = 700;
 161
 162     typedef GM INHERITED;
 163 };
 164
 165 //////////////////////////////////////////////////////////////////////////////
 166
 167 DEF_GM(return new MixedTextBlobsGM;)
 168 }