1 /* 2 * Copyright 2017 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 "Resources.h" 10 #include "SkCanvas.h" 11 #include "SkSurface.h" 12 #include "SkTextBlob.h" 13 #include "SkTypeface.h" 14 #include "sk_tool_utils.h" 15 16 /** 17 * This GM tests reusing the same text blobs with distance fields rendering using various 18 * combinations of perspective and non-perspetive matrices, scissor clips, and different x,y params 19 * passed to the draw. 20 */ 21 class DFTextBlobPerspGM : public skiagm::GM { 22 public: 23 DFTextBlobPerspGM() { this->setBGColor(0xFFFFFFFF); } 24 25 protected: 26 SkString onShortName() override { 27 SkString name("dftext_blob_persp"); 28 name.append(sk_tool_utils::platform_font_manager()); 29 return name; 30 } 31 32 SkISize onISize() override { return SkISize::Make(900, 350); } 33 34 void onOnceBeforeDraw() override { 35 for (int i = 0; i < 3; ++i) { 36 SkPaint paint; 37 paint.setTextSize(32); 38 paint.setAntiAlias(i > 0); 39 paint.setLCDRenderText(i > 1); 40 paint.setSubpixelText(true); 41 SkTextBlobBuilder builder; 42 sk_tool_utils::add_to_text_blob(&builder, "SkiaText", paint, 0, 0); 43 fBlobs.emplace_back(builder.make()); 44 } 45 } 46 47 virtual void onDraw(SkCanvas* inputCanvas) override { 48 // set up offscreen rendering with distance field text 49 #if SK_SUPPORT_GPU 50 GrContext* ctx = inputCanvas->getGrContext(); 51 SkISize size = this->onISize(); 52 if (!inputCanvas->getBaseLayerSize().isEmpty()) { 53 size = inputCanvas->getBaseLayerSize(); 54 } 55 SkImageInfo info = SkImageInfo::MakeN32(size.width(), size.height(), kPremul_SkAlphaType, 56 inputCanvas->imageInfo().refColorSpace()); 57 SkSurfaceProps props(SkSurfaceProps::kUseDeviceIndependentFonts_Flag, 58 SkSurfaceProps::kLegacyFontHost_InitType); 59 auto surface = SkSurface::MakeRenderTarget(ctx, SkBudgeted::kNo, info, 0, &props); 60 SkCanvas* canvas = surface ? surface->getCanvas() : inputCanvas; 61 // init our new canvas with the old canvas's matrix 62 canvas->setMatrix(inputCanvas->getTotalMatrix()); 63 #else 64 SkCanvas* canvas = inputCanvas; 65 #endif 66 SkScalar x = 0, y = 0; 67 SkScalar maxH = 0; 68 for (auto twm : {TranslateWithMatrix::kNo, TranslateWithMatrix::kYes}) { 69 for (auto pm : {PerspMode::kNone, PerspMode::kX, PerspMode::kY, PerspMode::kXY}) { 70 for (auto& blob : fBlobs) { 71 for (bool clip : {false, true}) { 72 canvas->save(); 73 SkScalar w = blob->bounds().width(); 74 SkScalar h = blob->bounds().height(); 75 if (clip) { 76 auto rect = 77 SkRect::MakeXYWH(x + 5, y + 5, w * 3.f / 4.f, h * 3.f / 4.f); 78 canvas->clipRect(rect, false); 79 } 80 this->drawBlob(canvas, blob.get(), SK_ColorBLACK, x, y + h, pm, twm); 81 x += w + 20.f; 82 maxH = SkTMax(h, maxH); 83 canvas->restore(); 84 } 85 } 86 x = 0; 87 y += maxH + 20.f; 88 maxH = 0; 89 } 90 } 91 #if SK_SUPPORT_GPU 92 // render offscreen buffer 93 if (surface) { 94 SkAutoCanvasRestore acr(inputCanvas, true); 95 // since we prepended this matrix already, we blit using identity 96 inputCanvas->resetMatrix(); 97 inputCanvas->drawImage(surface->makeImageSnapshot().get(), 0, 0, nullptr); 98 } 99 #endif 100 } 101 102 private: 103 enum class PerspMode { kNone, kX, kY, kXY }; 104 105 enum class TranslateWithMatrix : bool { kNo, kYes }; 106 107 void drawBlob(SkCanvas* canvas, SkTextBlob* blob, SkColor color, SkScalar x, SkScalar y, 108 PerspMode perspMode, TranslateWithMatrix translateWithMatrix) { 109 canvas->save(); 110 SkMatrix persp = SkMatrix::I(); 111 switch (perspMode) { 112 case PerspMode::kNone: 113 break; 114 case PerspMode::kX: 115 persp.setPerspX(0.005f); 116 break; 117 case PerspMode::kY: 118 persp.setPerspY(00.005f); 119 break; 120 case PerspMode::kXY: 121 persp.setPerspX(-0.001f); 122 persp.setPerspY(-0.0015f); 123 break; 124 } 125 persp = SkMatrix::Concat(persp, SkMatrix::MakeTrans(-x, -y)); 126 persp = SkMatrix::Concat(SkMatrix::MakeTrans(x, y), persp); 127 canvas->concat(persp); 128 if (TranslateWithMatrix::kYes == translateWithMatrix) { 129 canvas->translate(x, y); 130 x = 0; 131 y = 0; 132 } 133 SkPaint paint; 134 paint.setColor(color); 135 canvas->drawTextBlob(blob, x, y, paint); 136 canvas->restore(); 137 } 138 139 SkTArray<sk_sp<SkTextBlob>, true> fBlobs; 140 typedef skiagm::GM INHERITED; 141 }; 142 143 DEF_GM(return new DFTextBlobPerspGM;) 144