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 #include "sk_tool_utils.h" 10 11 #include "Resources.h" 12 #include "SkCanvas.h" 13 #include "SkGradientShader.h" 14 #include "SkRandomScalerContext.h" 15 #include "SkStream.h" 16 #include "SkSurface.h" 17 #include "SkTextBlob.h" 18 #include "SkTypeface.h" 19 20 #include "GrContext.h" 21 22 namespace skiagm { 23 class TextBlobRandomFont : public GM { 24 public: 25 // This gm tests that textblobs can be translated and scaled with a font that returns random 26 // but deterministic masks TextBlobRandomFont()27 TextBlobRandomFont() { } 28 29 protected: onOnceBeforeDraw()30 void onOnceBeforeDraw() override { 31 SkTextBlobBuilder builder; 32 33 const char* text = "The quick brown fox jumps over the lazy dog."; 34 35 SkPaint paint; 36 paint.setAntiAlias(true); 37 paint.setColor(SK_ColorMAGENTA); 38 39 // make textbloben 40 SkFont font; 41 font.setSize(32); 42 font.setEdging(SkFont::Edging::kSubpixelAntiAlias); 43 44 // Setup our random scaler context 45 auto typeface = sk_tool_utils::create_portable_typeface("sans-serif", SkFontStyle::Bold()); 46 if (!typeface) { 47 typeface = SkTypeface::MakeDefault(); 48 } 49 font.setTypeface(sk_make_sp<SkRandomTypeface>(std::move(typeface), paint, false)); 50 51 SkScalar y = 0; 52 SkRect bounds; 53 font.measureText(text, strlen(text), kUTF8_SkTextEncoding, &bounds); 54 y -= bounds.fTop; 55 sk_tool_utils::add_to_text_blob(&builder, text, font, 0, y); 56 y += bounds.fBottom; 57 58 // A8 59 const char* bigtext1 = "The quick brown fox"; 60 const char* bigtext2 = "jumps over the lazy dog."; 61 font.setSize(160); 62 font.setSubpixel(false); 63 font.setEdging(SkFont::Edging::kAntiAlias); 64 font.measureText(bigtext1, strlen(bigtext1), kUTF8_SkTextEncoding, &bounds); 65 y -= bounds.fTop; 66 sk_tool_utils::add_to_text_blob(&builder, bigtext1, font, 0, y); 67 y += bounds.fBottom; 68 69 font.measureText(bigtext2, strlen(bigtext2), kUTF8_SkTextEncoding, &bounds); 70 y -= bounds.fTop; 71 sk_tool_utils::add_to_text_blob(&builder, bigtext2, font, 0, y); 72 y += bounds.fBottom; 73 74 // color emoji 75 if (sk_sp<SkTypeface> origEmoji = sk_tool_utils::emoji_typeface()) { 76 font.setTypeface(sk_make_sp<SkRandomTypeface>(origEmoji, paint, false)); 77 const char* emojiText = sk_tool_utils::emoji_sample_text(); 78 font.measureText(emojiText, strlen(emojiText), kUTF8_SkTextEncoding, &bounds); 79 y -= bounds.fTop; 80 sk_tool_utils::add_to_text_blob(&builder, emojiText, font, 0, y); 81 y += bounds.fBottom; 82 } 83 84 // build 85 fBlob = builder.make(); 86 } 87 onShortName()88 SkString onShortName() override { 89 return SkString("textblobrandomfont"); 90 } 91 onISize()92 SkISize onISize() override { 93 return SkISize::Make(kWidth, kHeight); 94 } 95 onDraw(SkCanvas * canvas)96 void onDraw(SkCanvas* canvas) override { 97 // This GM exists to test a specific feature of the GPU backend. 98 // This GM uses sk_tool_utils::makeSurface which doesn't work well with vias. 99 // This GM uses SkRandomTypeface which doesn't work well with serialization. 100 if (nullptr == canvas->getGrContext()) { 101 skiagm::GM::DrawGpuOnlyMessage(canvas); 102 return; 103 } 104 105 canvas->drawColor(SK_ColorWHITE); 106 107 SkImageInfo info = SkImageInfo::Make(kWidth, kHeight, canvas->imageInfo().colorType(), 108 kPremul_SkAlphaType, 109 canvas->imageInfo().refColorSpace()); 110 SkSurfaceProps props(0, kUnknown_SkPixelGeometry); 111 auto surface(sk_tool_utils::makeSurface(canvas, info, &props)); 112 if (!surface) { 113 canvas->drawString("This test requires a surface", 10, 100, SkFont(), SkPaint()); 114 return; 115 } 116 117 SkPaint paint; 118 paint.setAntiAlias(true); 119 120 SkCanvas* surfaceCanvas = surface->getCanvas(); 121 122 SkScalar stride = SkScalarCeilToScalar(fBlob->bounds().height()); 123 SkScalar yOffset = 5; 124 125 canvas->save(); 126 // Originally we would alternate between rotating and not to force blob regeneration, 127 // but that code seems to have rotted. Keeping the rotate to match the old GM as 128 // much as possible, and it seems like a reasonable stress test for transformed 129 // color emoji. 130 canvas->rotate(-0.05f); 131 canvas->drawTextBlob(fBlob, 10, yOffset, paint); 132 yOffset += stride; 133 canvas->restore(); 134 135 // this will test lcd masks when not requested 136 // on cpu this currently causes unspecified behavior, so avoid until it is fixed 137 if (canvas->getGrContext()) { 138 // Rotate in the surface canvas, not the final canvas, to avoid aliasing 139 surfaceCanvas->rotate(-0.05f); 140 surfaceCanvas->drawTextBlob(fBlob, 10, yOffset, paint); 141 surface->draw(canvas, 0, 0, nullptr); 142 } 143 yOffset += stride; 144 145 // free gpu resources and verify 146 if (canvas->getGrContext()) { 147 canvas->getGrContext()->freeGpuResources(); 148 } 149 150 canvas->rotate(-0.05f); 151 canvas->drawTextBlob(fBlob, 10, yOffset, paint); 152 yOffset += stride; 153 } 154 155 private: 156 sk_sp<SkTextBlob> fBlob; 157 158 static constexpr int kWidth = 2000; 159 static constexpr int kHeight = 1600; 160 161 typedef GM INHERITED; 162 }; 163 164 ////////////////////////////////////////////////////////////////////////////// 165 166 DEF_GM(return new TextBlobRandomFont;) 167 } 168