1 /* 2 * Copyright 2011 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 "SkBitmap.h" 9 #include "SkCanvas.h" 10 #include "SkColor.h" 11 #include "SkDashPathEffect.h" 12 #include "SkMatrix.h" 13 #include "SkPaint.h" 14 #include "SkPathEffect.h" 15 #include "SkPoint.h" 16 #include "SkRect.h" 17 #include "SkRefCnt.h" 18 #include "SkScalar.h" 19 #include "SkSurface.h" 20 #include "SkTypes.h" 21 #include "Test.h" 22 23 #include <cmath> 24 #include <SkFont.h> 25 26 static const SkColor bgColor = SK_ColorWHITE; 27 28 static void create(SkBitmap* bm, SkIRect bound) { 29 bm->allocN32Pixels(bound.width(), bound.height()); 30 } 31 32 /** Assumes that the ref draw was completely inside ref canvas -- 33 implies that everything outside is "bgColor". 34 Checks that all overlap is the same and that all non-overlap on the 35 ref is "bgColor". 36 */ 37 static bool compare(const SkBitmap& ref, const SkIRect& iref, 38 const SkBitmap& test, const SkIRect& itest) 39 { 40 const int xOff = itest.fLeft - iref.fLeft; 41 const int yOff = itest.fTop - iref.fTop; 42 43 for (int y = 0; y < test.height(); ++y) { 44 for (int x = 0; x < test.width(); ++x) { 45 SkColor testColor = test.getColor(x, y); 46 int refX = x + xOff; 47 int refY = y + yOff; 48 SkColor refColor; 49 if (refX >= 0 && refX < ref.width() && 50 refY >= 0 && refY < ref.height()) 51 { 52 refColor = ref.getColor(refX, refY); 53 } else { 54 refColor = bgColor; 55 } 56 if (refColor != testColor) { 57 return false; 58 } 59 } 60 } 61 return true; 62 } 63 64 /** Test that drawing glyphs with empty paths is different from drawing glyphs without paths. */ 65 DEF_TEST(DrawText_dashout, reporter) { 66 SkIRect size = SkIRect::MakeWH(64, 64); 67 68 SkBitmap drawTextBitmap; 69 create(&drawTextBitmap, size); 70 SkCanvas drawTextCanvas(drawTextBitmap); 71 72 SkBitmap drawDashedTextBitmap; 73 create(&drawDashedTextBitmap, size); 74 SkCanvas drawDashedTextCanvas(drawDashedTextBitmap); 75 76 SkBitmap emptyBitmap; 77 create(&emptyBitmap, size); 78 SkCanvas emptyCanvas(emptyBitmap); 79 80 SkPoint point = SkPoint::Make(25.0f, 25.0f); 81 SkFont font(nullptr, 20); 82 font.setEdging(SkFont::Edging::kSubpixelAntiAlias); 83 font.setSubpixel(true); 84 85 SkPaint paint; 86 paint.setColor(SK_ColorGRAY); 87 paint.setStyle(SkPaint::kStroke_Style); 88 89 // Draw a stroked "A" without a dash which will draw something. 90 drawTextCanvas.drawColor(SK_ColorWHITE); 91 drawTextCanvas.drawString("A", point.fX, point.fY, font, paint); 92 93 // Draw an "A" but with a dash which will never draw anything. 94 paint.setStrokeWidth(2); 95 constexpr SkScalar bigInterval = 10000; 96 static constexpr SkScalar intervals[] = { 1, bigInterval }; 97 paint.setPathEffect(SkDashPathEffect::Make(intervals, SK_ARRAY_COUNT(intervals), 2)); 98 99 drawDashedTextCanvas.drawColor(SK_ColorWHITE); 100 drawDashedTextCanvas.drawString("A", point.fX, point.fY, font, paint); 101 102 // Draw nothing. 103 emptyCanvas.drawColor(SK_ColorWHITE); 104 105 REPORTER_ASSERT(reporter, !compare(drawTextBitmap, size, emptyBitmap, size)); 106 REPORTER_ASSERT(reporter, compare(drawDashedTextBitmap, size, emptyBitmap, size)); 107 } 108 109 // Test drawing text at some unusual coordinates. 110 // We measure success by not crashing or asserting. 111 DEF_TEST(DrawText_weirdCoordinates, r) { 112 auto surface = SkSurface::MakeRasterN32Premul(10,10); 113 auto canvas = surface->getCanvas(); 114 115 SkScalar oddballs[] = { 0.0f, (float)INFINITY, (float)NAN, 34359738368.0f }; 116 117 for (auto x : oddballs) { 118 canvas->drawString("a", +x, 0.0f, SkFont(), SkPaint()); 119 canvas->drawString("a", -x, 0.0f, SkFont(), SkPaint()); 120 } 121 for (auto y : oddballs) { 122 canvas->drawString("a", 0.0f, +y, SkFont(), SkPaint()); 123 canvas->drawString("a", 0.0f, -y, SkFont(), SkPaint()); 124 } 125 } 126 127 // Test drawing text with some unusual matricies. 128 // We measure success by not crashing or asserting. 129 DEF_TEST(DrawText_weirdMatricies, r) { 130 auto surface = SkSurface::MakeRasterN32Premul(100,100); 131 auto canvas = surface->getCanvas(); 132 133 SkFont font; 134 font.setEdging(SkFont::Edging::kSubpixelAntiAlias); 135 136 struct { 137 SkScalar textSize; 138 SkScalar matrix[9]; 139 } testCases[] = { 140 // 2x2 singular 141 {10, { 0, 0, 0, 0, 0, 0, 0, 0, 1}}, 142 {10, { 0, 0, 0, 0, 1, 0, 0, 0, 1}}, 143 {10, { 0, 0, 0, 1, 0, 0, 0, 0, 1}}, 144 {10, { 0, 0, 0, 1, 1, 0, 0, 0, 1}}, 145 {10, { 0, 1, 0, 0, 1, 0, 0, 0, 1}}, 146 {10, { 1, 0, 0, 0, 0, 0, 0, 0, 1}}, 147 {10, { 1, 0, 0, 1, 0, 0, 0, 0, 1}}, 148 {10, { 1, 1, 0, 0, 0, 0, 0, 0, 1}}, 149 {10, { 1, 1, 0, 1, 1, 0, 0, 0, 1}}, 150 // See https://bugzilla.mozilla.org/show_bug.cgi?id=1305085 . 151 { 1, {10, 20, 0, 20, 40, 0, 0, 0, 1}}, 152 }; 153 154 for (const auto& testCase : testCases) { 155 font.setSize(testCase.textSize); 156 const SkScalar(&m)[9] = testCase.matrix; 157 SkMatrix mat; 158 mat.setAll(m[0], m[1], m[2], m[3], m[4], m[5], m[6], m[7], m[8]); 159 canvas->setMatrix(mat); 160 canvas->drawString("Hamburgefons", 10, 10, font, SkPaint()); 161 } 162 } 163
