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| 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 rege
nerated |
| 21 // correctly. With smaller atlas sizes, it can also trigger regeneration of
texture coords on |
| 22 // the GPU backend |
| 23 TextBlobColorTrans() { } |
| 24 |
| 25 protected: |
| 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 |
| 54 SkString onShortName() override { |
| 55 return SkString("textblobcolortrans"); |
| 56 } |
| 57 |
| 58 SkISize onISize() override { |
| 59 return SkISize::Make(kWidth, kHeight); |
| 60 } |
| 61 |
| 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 Back
end will cache A8 |
| 72 // Texture Blobs based on the canonical color they map to. Canonical co
lors are used to |
| 73 // create masks. For A8 there are 8 of them. |
| 74 SkColor colors[] = {SK_ColorCYAN, SK_ColorLTGRAY, SK_ColorYELLOW, SK_Col
orWHITE}; |
| 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 } |
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