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.h" 9 10 #include "Resources.h" 11 #include "SkCanvas.h" 12 #include "SkGradientShader.h" 13 #include "SkStream.h" 14 #include "SkTextBlob.h" 15 #include "SkTypeface.h" 16 17 namespace skiagm { 18 class TextBlobColorTrans : public GM { 19 public: 20 // This gm tests that textblobs can be translated and have their colors regenerated 21 // correctly. With smaller atlas sizes, it can also trigger regeneration of texture coords on 22 // the GPU backend TextBlobColorTrans()23 TextBlobColorTrans() { } 24 25 protected: onOnceBeforeDraw()26 void onOnceBeforeDraw() override { 27 SkTextBlobBuilder builder; 28 29 // make textblob 30 // Large text is used to trigger atlas eviction 31 SkPaint paint; 32 paint.setTextSize(256); 33 const char* text = "AB"; 34 sk_tool_utils::set_portable_typeface(&paint); 35 36 SkRect bounds; 37 paint.measureText(text, strlen(text), &bounds); 38 39 SkScalar yOffset = bounds.height(); 40 sk_tool_utils::add_to_text_blob(&builder, text, paint, 0, yOffset - 30); 41 42 // A8 43 paint.setTextSize(28); 44 text = "The quick brown fox jumps over the lazy dog."; 45 paint.setSubpixelText(false); 46 paint.setLCDRenderText(false); 47 paint.measureText(text, strlen(text), &bounds); 48 sk_tool_utils::add_to_text_blob(&builder, text, paint, 0, yOffset - 8); 49 50 // build 51 fBlob.reset(builder.build()); 52 } 53 onShortName()54 SkString onShortName() override { 55 return SkString("textblobcolortrans"); 56 } 57 onISize()58 SkISize onISize() override { 59 return SkISize::Make(kWidth, kHeight); 60 } 61 onDraw(SkCanvas * canvas)62 void onDraw(SkCanvas* canvas) override { 63 64 canvas->drawColor(SK_ColorGRAY); 65 66 SkPaint paint; 67 canvas->translate(10, 40); 68 69 SkRect bounds = fBlob->bounds(); 70 71 // Colors were chosen to map to pairs of canonical colors. The GPU Backend will cache A8 72 // Texture Blobs based on the canonical color they map to. Canonical colors are used to 73 // create masks. For A8 there are 8 of them. 74 SkColor colors[] = {SK_ColorCYAN, SK_ColorLTGRAY, SK_ColorYELLOW, SK_ColorWHITE}; 75 76 size_t count = SK_ARRAY_COUNT(colors); 77 size_t colorIndex = 0; 78 for (int y = 0; y + SkScalarFloorToInt(bounds.height()) < kHeight; 79 y += SkScalarFloorToInt(bounds.height())) { 80 paint.setColor(colors[colorIndex++ % count]); 81 canvas->save(); 82 canvas->translate(0, SkIntToScalar(y)); 83 canvas->drawTextBlob(fBlob, 0, 0, paint); 84 canvas->restore(); 85 } 86 } 87 88 private: 89 SkAutoTUnref<const SkTextBlob> fBlob; 90 91 static const int kWidth = 675; 92 static const int kHeight = 1600; 93 94 typedef GM INHERITED; 95 }; 96 97 ////////////////////////////////////////////////////////////////////////////// 98 99 DEF_GM( return SkNEW(TextBlobColorTrans); ) 100 } 101