1 /* 2 * Copyright 2015 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/gm.h" 9 #include "include/core/SkCanvas.h" 10 #include "include/core/SkColor.h" 11 #include "include/core/SkFont.h" 12 #include "include/core/SkFontTypes.h" 13 #include "include/core/SkPaint.h" 14 #include "include/core/SkRect.h" 15 #include "include/core/SkRefCnt.h" 16 #include "include/core/SkScalar.h" 17 #include "include/core/SkSize.h" 18 #include "include/core/SkString.h" 19 #include "include/core/SkTextBlob.h" 20 #include "include/core/SkTypeface.h" 21 #include "include/core/SkTypes.h" 22 #include "tools/ToolUtils.h" 23 #include "tools/fonts/FontToolUtils.h" 24 25 #include <string.h> 26 27 namespace skiagm { 28 class TextBlobColorTrans : public GM { 29 public: 30 // This gm tests that textblobs can be translated and have their colors regenerated 31 // correctly. With smaller atlas sizes, it can also trigger regeneration of texture coords on 32 // the GPU backend TextBlobColorTrans()33 TextBlobColorTrans() { } 34 35 protected: onOnceBeforeDraw()36 void onOnceBeforeDraw() override { 37 SkTextBlobBuilder builder; 38 39 // make textblob 40 // Large text is used to trigger atlas eviction 41 SkFont font(ToolUtils::DefaultPortableTypeface(), 256); 42 font.setEdging(SkFont::Edging::kAlias); 43 const char* text = "AB"; 44 45 SkRect bounds; 46 font.measureText(text, strlen(text), SkTextEncoding::kUTF8, &bounds); 47 48 SkScalar yOffset = bounds.height(); 49 ToolUtils::add_to_text_blob(&builder, text, font, 0, yOffset - 30); 50 51 // A8 52 font.setSize(28); 53 text = "The quick brown fox jumps over the lazy dog."; 54 font.measureText(text, strlen(text), SkTextEncoding::kUTF8, &bounds); 55 ToolUtils::add_to_text_blob(&builder, text, font, 0, yOffset - 8); 56 57 // build 58 fBlob = builder.make(); 59 } 60 getName() const61 SkString getName() const override { return SkString("textblobcolortrans"); } 62 getISize()63 SkISize getISize() override { return SkISize::Make(kWidth, kHeight); } 64 onDraw(SkCanvas * canvas)65 void onDraw(SkCanvas* canvas) override { 66 67 canvas->drawColor(SK_ColorGRAY); 68 69 SkPaint paint; 70 canvas->translate(10, 40); 71 72 SkRect bounds = fBlob->bounds(); 73 74 // Colors were chosen to map to pairs of canonical colors. The GPU Backend will cache A8 75 // Texture Blobs based on the canonical color they map to. Canonical colors are used to 76 // create masks. For A8 there are 8 of them. 77 SkColor colors[] = {SK_ColorCYAN, SK_ColorLTGRAY, SK_ColorYELLOW, SK_ColorWHITE}; 78 79 size_t count = std::size(colors); 80 size_t colorIndex = 0; 81 for (int y = 0; y + SkScalarFloorToInt(bounds.height()) < kHeight; 82 y += SkScalarFloorToInt(bounds.height())) { 83 paint.setColor(colors[colorIndex++ % count]); 84 canvas->save(); 85 canvas->translate(0, SkIntToScalar(y)); 86 canvas->drawTextBlob(fBlob, 0, 0, paint); 87 canvas->restore(); 88 } 89 } 90 91 private: 92 sk_sp<SkTextBlob> fBlob; 93 94 inline static constexpr int kWidth = 675; 95 inline static constexpr int kHeight = 1600; 96 97 using INHERITED = GM; 98 }; 99 100 ////////////////////////////////////////////////////////////////////////////// 101 102 DEF_GM(return new TextBlobColorTrans;) 103 } // namespace skiagm 104