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 #include "sk_tool_utils.h" 10 11 #include "SkCanvas.h" 12 #include "SkGradientShader.h" 13 #include "SkPoint.h" 14 #include "SkShader.h" 15 #include "SkTextBlob.h" 16 #include "SkTDArray.h" 17 #include "SkTypeface.h" 18 19 // This GM exercises drawTextBlob offset vs. shader space behavior. 20 class TextBlobShaderGM : public skiagm::GM { 21 public: TextBlobShaderGM()22 TextBlobShaderGM() {} 23 24 private: onOnceBeforeDraw()25 void onOnceBeforeDraw() override { 26 { 27 SkFont font(sk_tool_utils::create_portable_typeface()); 28 const char* txt = "Blobber"; 29 size_t txtLen = strlen(txt); 30 fGlyphs.append(font.countText(txt, txtLen, kUTF8_SkTextEncoding)); 31 font.textToGlyphs(txt, txtLen, kUTF8_SkTextEncoding, fGlyphs.begin(), fGlyphs.count()); 32 } 33 34 SkFont font; 35 font.setSubpixel(true); 36 font.setEdging(SkFont::Edging::kAntiAlias); 37 font.setSize(30); 38 font.setTypeface(sk_tool_utils::create_portable_typeface()); 39 40 SkTextBlobBuilder builder; 41 int glyphCount = fGlyphs.count(); 42 const SkTextBlobBuilder::RunBuffer* run; 43 44 run = &builder.allocRun(font, glyphCount, 10, 10, nullptr); 45 memcpy(run->glyphs, fGlyphs.begin(), glyphCount * sizeof(uint16_t)); 46 47 run = &builder.allocRunPosH(font, glyphCount, 80, nullptr); 48 memcpy(run->glyphs, fGlyphs.begin(), glyphCount * sizeof(uint16_t)); 49 for (int i = 0; i < glyphCount; ++i) { 50 run->pos[i] = font.getSize() * i * .75f; 51 } 52 53 run = &builder.allocRunPos(font, glyphCount, nullptr); 54 memcpy(run->glyphs, fGlyphs.begin(), glyphCount * sizeof(uint16_t)); 55 for (int i = 0; i < glyphCount; ++i) { 56 run->pos[i * 2] = font.getSize() * i * .75f; 57 run->pos[i * 2 + 1] = 150 + 5 * sinf((float)i * 8 / glyphCount); 58 } 59 60 fBlob = builder.make(); 61 62 SkColor colors[2]; 63 colors[0] = SK_ColorRED; 64 colors[1] = SK_ColorGREEN; 65 66 SkScalar pos[SK_ARRAY_COUNT(colors)]; 67 for (unsigned i = 0; i < SK_ARRAY_COUNT(pos); ++i) { 68 pos[i] = (float)i / (SK_ARRAY_COUNT(pos) - 1); 69 } 70 71 SkISize sz = this->onISize(); 72 fShader = SkGradientShader::MakeRadial(SkPoint::Make(SkIntToScalar(sz.width() / 2), 73 SkIntToScalar(sz.height() / 2)), 74 sz.width() * .66f, colors, pos, 75 SK_ARRAY_COUNT(colors), 76 SkShader::kRepeat_TileMode); 77 } 78 onShortName()79 SkString onShortName() override { 80 return SkString("textblobshader"); 81 } 82 onISize()83 SkISize onISize() override { 84 return SkISize::Make(640, 480); 85 } 86 onDraw(SkCanvas * canvas)87 void onDraw(SkCanvas* canvas) override { 88 SkPaint p; 89 p.setAntiAlias(true); 90 p.setStyle(SkPaint::kFill_Style); 91 p.setShader(fShader); 92 93 SkISize sz = this->onISize(); 94 constexpr int kXCount = 4; 95 constexpr 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 SkTDArray<uint16_t> fGlyphs; 107 sk_sp<SkTextBlob> fBlob; 108 sk_sp<SkShader> fShader; 109 110 typedef skiagm::GM INHERITED; 111 }; 112 113 DEF_GM(return new TextBlobShaderGM;) 114