fmalita | 8483326 | 2014-09-19 11:40:51 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2014 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 "SkCanvas.h" |
| 11 | #include "SkGradientShader.h" |
| 12 | #include "SkPoint.h" |
| 13 | #include "SkShader.h" |
| 14 | #include "SkTextBlob.h" |
| 15 | #include "SkTDArray.h" |
| 16 | #include "SkTypeface.h" |
| 17 | |
| 18 | // This GM exercises drawTextBlob offset vs. shader space behavior. |
| 19 | class TextBlobShaderGM : public skiagm::GM { |
| 20 | public: |
| 21 | TextBlobShaderGM(const char* txt) { |
| 22 | SkPaint p; |
| 23 | size_t txtLen = strlen(txt); |
| 24 | fGlyphs.append(p.textToGlyphs(txt, txtLen, NULL)); |
| 25 | p.textToGlyphs(txt, txtLen, fGlyphs.begin()); |
| 26 | } |
| 27 | |
| 28 | protected: |
| 29 | |
| 30 | virtual void onOnceBeforeDraw() SK_OVERRIDE { |
| 31 | SkPaint p; |
| 32 | p.setAntiAlias(true); |
| 33 | p.setSubpixelText(true); |
| 34 | p.setTextSize(30); |
| 35 | p.setTextEncoding(SkPaint::kGlyphID_TextEncoding); |
| 36 | |
| 37 | SkTextBlobBuilder builder; |
| 38 | int glyphCount = fGlyphs.count(); |
| 39 | const SkTextBlobBuilder::RunBuffer* run; |
| 40 | |
| 41 | run = &builder.allocRun(p, glyphCount, 10, 10, NULL); |
| 42 | memcpy(run->glyphs, fGlyphs.begin(), glyphCount * sizeof(uint16_t)); |
| 43 | |
| 44 | run = &builder.allocRunPosH(p, glyphCount, 80, NULL); |
| 45 | memcpy(run->glyphs, fGlyphs.begin(), glyphCount * sizeof(uint16_t)); |
| 46 | for (int i = 0; i < glyphCount; ++i) { |
| 47 | run->pos[i] = p.getTextSize() * i * .75f; |
| 48 | } |
| 49 | |
| 50 | run = &builder.allocRunPos(p, glyphCount, NULL); |
| 51 | memcpy(run->glyphs, fGlyphs.begin(), glyphCount * sizeof(uint16_t)); |
| 52 | for (int i = 0; i < glyphCount; ++i) { |
| 53 | run->pos[i * 2] = p.getTextSize() * i * .75f; |
| 54 | run->pos[i * 2 + 1] = 150 + 5 * sinf((float)i * 8 / glyphCount); |
| 55 | } |
| 56 | |
| 57 | fBlob.reset(builder.build()); |
| 58 | |
| 59 | SkColor colors[2]; |
| 60 | colors[0] = SK_ColorRED; |
| 61 | colors[1] = SK_ColorGREEN; |
| 62 | |
| 63 | SkScalar pos[SK_ARRAY_COUNT(colors)]; |
| 64 | for (unsigned i = 0; i < SK_ARRAY_COUNT(pos); ++i) { |
| 65 | pos[i] = (float)i / (SK_ARRAY_COUNT(pos) - 1); |
| 66 | } |
| 67 | |
| 68 | SkISize sz = this->onISize(); |
| 69 | fShader.reset(SkGradientShader::CreateRadial(SkPoint::Make(SkIntToScalar(sz.width() / 2), |
| 70 | SkIntToScalar(sz.height() / 2)), |
| 71 | sz.width() * .66f, colors, pos, |
| 72 | SK_ARRAY_COUNT(colors), |
| 73 | SkShader::kRepeat_TileMode)); |
| 74 | } |
| 75 | |
| 76 | virtual uint32_t onGetFlags() const SK_OVERRIDE { |
| 77 | return kSkip565_Flag; |
| 78 | } |
| 79 | |
| 80 | virtual SkString onShortName() SK_OVERRIDE { |
| 81 | return SkString("textblobshader"); |
| 82 | } |
| 83 | |
| 84 | virtual SkISize onISize() SK_OVERRIDE { |
| 85 | return SkISize::Make(640, 480); |
| 86 | } |
| 87 | |
| 88 | virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE { |
| 89 | SkPaint p; |
| 90 | p.setStyle(SkPaint::kFill_Style); |
| 91 | p.setShader(fShader); |
| 92 | |
| 93 | SkISize sz = this->onISize(); |
| 94 | static const int kXCount = 4; |
| 95 | static const int kYCount = 3; |
| 96 | for (int i = 0; i < kXCount; ++i) { |
| 97 | for (int j = 0; j < kYCount; ++j) { |
| 98 | canvas->drawTextBlob(fBlob, |
| 99 | SkIntToScalar(i * sz.width() / kXCount), |
| 100 | SkIntToScalar(j * sz.height() / kYCount), |
| 101 | p); |
| 102 | } |
| 103 | } |
| 104 | } |
| 105 | |
| 106 | private: |
| 107 | SkTDArray<uint16_t> fGlyphs; |
| 108 | SkAutoTUnref<const SkTextBlob> fBlob; |
| 109 | SkAutoTUnref<SkShader> fShader; |
| 110 | |
| 111 | typedef skiagm::GM INHERITED; |
| 112 | }; |
| 113 | |
| 114 | DEF_GM( return SkNEW_ARGS(TextBlobShaderGM, ("Blobber")); ) |