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 GpuGM { 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(GrContext * context,GrRenderTargetContext *,SkCanvas * canvas,SkString * errorMsg)96 DrawResult onDraw(GrContext* context, GrRenderTargetContext*, SkCanvas* canvas, 97 SkString* errorMsg) override { 98 // This GM exists to test a specific feature of the GPU backend. 99 // This GM uses sk_tool_utils::makeSurface which doesn't work well with vias. 100 // This GM uses SkRandomTypeface which doesn't work well with serialization. 101 canvas->drawColor(SK_ColorWHITE); 102 103 SkImageInfo info = SkImageInfo::Make(kWidth, kHeight, canvas->imageInfo().colorType(), 104 kPremul_SkAlphaType, 105 canvas->imageInfo().refColorSpace()); 106 SkSurfaceProps props(0, kUnknown_SkPixelGeometry); 107 auto surface(sk_tool_utils::makeSurface(canvas, info, &props)); 108 if (!surface) { 109 *errorMsg = "This test requires a surface"; 110 return DrawResult::kFail; 111 } 112 113 SkPaint paint; 114 paint.setAntiAlias(true); 115 116 SkCanvas* surfaceCanvas = surface->getCanvas(); 117 118 SkScalar stride = SkScalarCeilToScalar(fBlob->bounds().height()); 119 SkScalar yOffset = 5; 120 121 canvas->save(); 122 // Originally we would alternate between rotating and not to force blob regeneration, 123 // but that code seems to have rotted. Keeping the rotate to match the old GM as 124 // much as possible, and it seems like a reasonable stress test for transformed 125 // color emoji. 126 canvas->rotate(-0.05f); 127 canvas->drawTextBlob(fBlob, 10, yOffset, paint); 128 yOffset += stride; 129 canvas->restore(); 130 131 // Rotate in the surface canvas, not the final canvas, to avoid aliasing 132 surfaceCanvas->rotate(-0.05f); 133 surfaceCanvas->drawTextBlob(fBlob, 10, yOffset, paint); 134 surface->draw(canvas, 0, 0, nullptr); 135 yOffset += stride; 136 137 // free gpu resources and verify 138 context->freeGpuResources(); 139 140 canvas->rotate(-0.05f); 141 canvas->drawTextBlob(fBlob, 10, yOffset, paint); 142 yOffset += stride; 143 return DrawResult::kOk; 144 } 145 146 private: 147 sk_sp<SkTextBlob> fBlob; 148 149 static constexpr int kWidth = 2000; 150 static constexpr int kHeight = 1600; 151 152 typedef GM INHERITED; 153 }; 154 155 ////////////////////////////////////////////////////////////////////////////// 156 157 DEF_GM(return new TextBlobRandomFont;) 158 } 159