1 /* 2 * Copyright 2012 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 #include "Resources.h" 11 #include "SkCanvas.h" 12 #include "SkString.h" 13 #include "SkSurfaceProps.h" 14 #include "SkTypeface.h" 15 #include "SkTypes.h" 16 17 static void getGlyphPositions(const SkPaint& paint, const uint16_t glyphs[], 18 int count, SkScalar x, SkScalar y, SkPoint pos[]) { 19 SkASSERT(SkPaint::kGlyphID_TextEncoding == paint.getTextEncoding()); 20 21 SkAutoSTMalloc<128, SkScalar> widthStorage(count); 22 SkScalar* widths = widthStorage.get(); 23 paint.getTextWidths(glyphs, count * sizeof(uint16_t), widths); 24 25 for (int i = 0; i < count; ++i) { 26 pos[i].set(x, y); 27 x += widths[i]; 28 } 29 } 30 31 static void applyKerning(SkPoint pos[], const int32_t adjustments[], int count, 32 const SkPaint& paint) { 33 SkScalar scale = paint.getTextSize() / paint.getTypeface()->getUnitsPerEm(); 34 35 SkScalar globalAdj = 0; 36 for (int i = 0; i < count - 1; ++i) { 37 globalAdj += adjustments[i] * scale; 38 pos[i + 1].fX += globalAdj; 39 } 40 } 41 42 static void drawKernText(SkCanvas* canvas, const void* text, size_t len, 43 SkScalar x, SkScalar y, const SkPaint& paint) { 44 SkTypeface* face = paint.getTypeface(); 45 if (!face) { 46 canvas->drawText(text, len, x, y, paint); 47 return; 48 } 49 50 SkAutoSTMalloc<128, uint16_t> glyphStorage(len); 51 uint16_t* glyphs = glyphStorage.get(); 52 int glyphCount = paint.textToGlyphs(text, len, glyphs); 53 if (glyphCount < 1) { 54 return; 55 } 56 57 SkAutoSTMalloc<128, int32_t> adjustmentStorage(glyphCount - 1); 58 int32_t* adjustments = adjustmentStorage.get(); 59 if (!face->getKerningPairAdjustments(glyphs, glyphCount, adjustments)) { 60 canvas->drawText(text, len, x, y, paint); 61 return; 62 } 63 64 SkPaint glyphPaint(paint); 65 glyphPaint.setTextEncoding(SkPaint::kGlyphID_TextEncoding); 66 67 SkAutoSTMalloc<128, SkPoint> posStorage(glyphCount); 68 SkPoint* pos = posStorage.get(); 69 getGlyphPositions(glyphPaint, glyphs, glyphCount, x, y, pos); 70 71 applyKerning(pos, adjustments, glyphCount, glyphPaint); 72 canvas->drawPosText(glyphs, glyphCount * sizeof(uint16_t), pos, glyphPaint); 73 } 74 75 constexpr struct { 76 const char* fName; 77 SkTypeface::Style fStyle; 78 } gFaceStyles[] = { 79 { "sans-serif", SkTypeface::kNormal }, 80 { "sans-serif", SkTypeface::kBold }, 81 { "sans-serif", SkTypeface::kItalic }, 82 { "sans-serif", SkTypeface::kBoldItalic }, 83 { "serif", SkTypeface::kNormal }, 84 { "serif", SkTypeface::kBold }, 85 { "serif", SkTypeface::kItalic }, 86 { "serif", SkTypeface::kBoldItalic }, 87 { "monospace", SkTypeface::kNormal }, 88 { "monospace", SkTypeface::kBold }, 89 { "monospace", SkTypeface::kItalic }, 90 { "monospace", SkTypeface::kBoldItalic }, 91 }; 92 93 constexpr int gFaceStylesCount = SK_ARRAY_COUNT(gFaceStyles); 94 95 class TypefaceStylesGM : public skiagm::GM { 96 sk_sp<SkTypeface> fFaces[gFaceStylesCount]; 97 bool fApplyKerning; 98 99 public: 100 TypefaceStylesGM(bool applyKerning) 101 : fApplyKerning(applyKerning) { 102 memset(fFaces, 0, sizeof(fFaces)); 103 } 104 105 protected: 106 void onOnceBeforeDraw() override { 107 for (int i = 0; i < gFaceStylesCount; i++) { 108 fFaces[i] = SkTypeface::MakeFromName( 109 sk_tool_utils::platform_font_name( 110 gFaceStyles[i].fName), SkFontStyle::FromOldStyle(gFaceStyles[i].fStyle)); 111 } 112 } 113 114 SkString onShortName() override { 115 SkString name("typefacestyles"); 116 if (fApplyKerning) { 117 name.append("_kerning"); 118 } 119 name.append(sk_tool_utils::major_platform_os_name()); 120 return name; 121 } 122 123 SkISize onISize() override { 124 return SkISize::Make(640, 480); 125 } 126 127 void onDraw(SkCanvas* canvas) override { 128 SkPaint paint; 129 paint.setAntiAlias(true); 130 paint.setTextSize(SkIntToScalar(30)); 131 132 const char* text = fApplyKerning ? "Type AWAY" : "Hamburgefons"; 133 const size_t textLen = strlen(text); 134 135 SkScalar x = SkIntToScalar(10); 136 SkScalar dy = paint.getFontMetrics(nullptr); 137 SkScalar y = dy; 138 139 if (fApplyKerning) { 140 paint.setSubpixelText(true); 141 } else { 142 paint.setLinearText(true); 143 } 144 for (int i = 0; i < gFaceStylesCount; i++) { 145 paint.setTypeface(fFaces[i]); 146 canvas->drawText(text, textLen, x, y, paint); 147 if (fApplyKerning) { 148 drawKernText(canvas, text, textLen, x + 240, y, paint); 149 } 150 y += dy; 151 } 152 } 153 154 private: 155 typedef skiagm::GM INHERITED; 156 }; 157 158 DEF_GM( return new TypefaceStylesGM(false); ) 159 DEF_GM( return new TypefaceStylesGM(true); ) 160 161 //////////////////////////////////////////////////////////////////////////////// 162 163 static void draw_typeface_rendering_gm(SkCanvas* canvas, sk_sp<SkTypeface> face, 164 char character = 'A') { 165 struct AliasType { 166 bool antiAlias; 167 bool subpixelAntitalias; 168 bool inLayer; 169 } constexpr aliasTypes[] { 170 #ifndef SK_BUILD_FOR_IOS 171 // This gm crashes on iOS when drawing an embedded bitmap when requesting aliased rendering. 172 // The crash looks like 173 // libTrueTypeScaler.dylib`<redacted> + 80 174 // stop reason = EXC_BAD_ACCESS (code=EXC_ARM_DA_ALIGN, address=...) 175 // -> 0x330b19d0 <+80>: strd r2, r3, [r5, #36] 176 // 0x330b19d4 <+84>: movs r3, #0x0 177 // 0x330b19d6 <+86>: add r2, sp, #0x28 178 // 0x330b19d8 <+88>: ldr r0, [r4, #0x4] 179 // Disable testing embedded bitmaps on iOS for now. 180 // See https://bug.skia.org/5530 . 181 { false, false, false }, // aliased 182 #endif 183 { true, false, false }, // anti-aliased 184 { true, true , false }, // subpixel anti-aliased 185 { true, false, true }, // anti-aliased in layer (flat pixel geometry) 186 { true, true , true }, // subpixel anti-aliased in layer (flat pixel geometry) 187 }; 188 189 // The hintgasp.ttf is designed for the following sizes to be different. 190 // GASP_DOGRAY 0x0002 0<=ppem<=10 191 // GASP_SYMMETRIC_SMOOTHING 0x0008 0<=ppem<=10 192 // GASP_GRIDFIT 0x0001 11<=ppem<=12 193 // GASP_SYMMETRIC_GRIDFIT 0x0004 11<=ppem<=12 194 // GASP_DOGRAY|GASP_GRIDFIT 0x0003 13<=ppem<=14 195 // GASP_SYMMETRIC_SMOOTHING|GASP_SYMMETRIC_GRIDFIT 0x000C 13<=ppem<=14 196 // (neither) 0x0000 15<=ppem 197 // Odd sizes have embedded bitmaps. 198 constexpr SkScalar textSizes[] = { 9, 10, 11, 12, 13, 14, 15, 16 }; 199 200 constexpr SkPaint::Hinting hintingTypes[] = { SkPaint::kNo_Hinting, 201 SkPaint::kSlight_Hinting, 202 SkPaint::kNormal_Hinting, 203 SkPaint::kFull_Hinting }; 204 205 struct SubpixelType { 206 bool requested; 207 SkVector offset; 208 } constexpr subpixelTypes[] = { 209 { false, { 0.00, 0.00 } }, 210 { true , { 0.00, 0.00 } }, 211 { true , { 0.25, 0.00 } }, 212 { true , { 0.25, 0.25 } }, 213 }; 214 215 constexpr bool rotateABitTypes[] = { false, true }; 216 217 SkPaint paint; 218 paint.setTypeface(face); 219 paint.setEmbeddedBitmapText(true); 220 221 SkScalar x = 0; 222 SkScalar xMax = x; 223 SkScalar xBase = 0; 224 SkScalar y = 0; // The baseline of the previous output 225 for (const SubpixelType subpixel : subpixelTypes) { 226 y = 0; 227 paint.setSubpixelText(subpixel.requested); 228 229 for (const AliasType& alias : aliasTypes) { 230 paint.setAntiAlias(alias.antiAlias); 231 paint.setLCDRenderText(alias.subpixelAntitalias); 232 SkAutoCanvasRestore acr(canvas, false); 233 if (alias.inLayer) { 234 canvas->saveLayer(nullptr, &paint); 235 } 236 237 for (const SkScalar& textSize : textSizes) { 238 x = xBase + 5; 239 paint.setTextSize(textSize); 240 241 SkScalar dy = SkScalarCeilToScalar(paint.getFontMetrics(nullptr)); 242 y += dy; 243 for (const SkPaint::Hinting& hinting : hintingTypes) { 244 paint.setHinting(hinting); 245 246 for (const bool& rotateABit : rotateABitTypes) { 247 SkAutoCanvasRestore acr(canvas, true); 248 if (rotateABit) { 249 canvas->rotate(2, x + subpixel.offset.x(), 250 y + subpixel.offset.y()); 251 } 252 canvas->drawText(&character, 1, 253 x + subpixel.offset.x(), 254 y + subpixel.offset.y(), paint); 255 256 SkScalar dx = SkScalarCeilToScalar( 257 paint.measureText(&character, 1)) + 5; 258 x += dx; 259 xMax = SkTMax(x, xMax); 260 } 261 } 262 } 263 y += 10; 264 } 265 xBase = xMax; 266 } 267 } 268 269 DEF_SIMPLE_GM_BG_NAME(typefacerendering, canvas, 640, 680, SK_ColorWHITE, 270 SkStringPrintf("typefacerendering%s", 271 sk_tool_utils::major_platform_os_name().c_str())) { 272 if (sk_sp<SkTypeface> face = MakeResourceAsTypeface("/fonts/hintgasp.ttf")) { 273 draw_typeface_rendering_gm(canvas, std::move(face)); 274 } 275 } 276 277 // Type1 fonts don't currently work in Skia on Windows. 278 #ifndef SK_BUILD_FOR_WIN 279 280 DEF_SIMPLE_GM_BG_NAME(typefacerendering_pfa, canvas, 640, 680, SK_ColorWHITE, 281 SkStringPrintf("typefacerendering_pfa%s", 282 sk_tool_utils::major_platform_os_name().c_str())) { 283 if (sk_sp<SkTypeface> face = MakeResourceAsTypeface("fonts/Roboto2-Regular.pfa")) { 284 // This subsetted typeface doesn't have the character 'A'. 285 draw_typeface_rendering_gm(canvas, std::move(face), 'O'); 286 } 287 } 288 289 DEF_SIMPLE_GM_BG_NAME(typefacerendering_pfb, canvas, 640, 680, SK_ColorWHITE, 290 SkStringPrintf("typefacerendering_pfb%s", 291 sk_tool_utils::major_platform_os_name().c_str())) { 292 if (sk_sp<SkTypeface> face = MakeResourceAsTypeface("fonts/Roboto2-Regular.pfb")) { 293 draw_typeface_rendering_gm(canvas, std::move(face), 'O'); 294 } 295 } 296 297 #endif 298
