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 "SkPaint.h" 12 #include "SkPoint.h" 13 #include "SkRect.h" 14 #include "SkSurface.h" 15 #include "SkTypes.h" 16 #include "Test.h" 17 #include <math.h> 18 19 static const SkColor bgColor = SK_ColorWHITE; 20 21 static void create(SkBitmap* bm, SkIRect bound) { 22 bm->allocN32Pixels(bound.width(), bound.height()); 23 } 24 25 static void drawBG(SkCanvas* canvas) { 26 canvas->drawColor(bgColor); 27 } 28 29 /** Assumes that the ref draw was completely inside ref canvas -- 30 implies that everything outside is "bgColor". 31 Checks that all overlap is the same and that all non-overlap on the 32 ref is "bgColor". 33 */ 34 static bool compare(const SkBitmap& ref, const SkIRect& iref, 35 const SkBitmap& test, const SkIRect& itest) 36 { 37 const int xOff = itest.fLeft - iref.fLeft; 38 const int yOff = itest.fTop - iref.fTop; 39 40 for (int y = 0; y < test.height(); ++y) { 41 for (int x = 0; x < test.width(); ++x) { 42 SkColor testColor = test.getColor(x, y); 43 int refX = x + xOff; 44 int refY = y + yOff; 45 SkColor refColor; 46 if (refX >= 0 && refX < ref.width() && 47 refY >= 0 && refY < ref.height()) 48 { 49 refColor = ref.getColor(refX, refY); 50 } else { 51 refColor = bgColor; 52 } 53 if (refColor != testColor) { 54 return false; 55 } 56 } 57 } 58 return true; 59 } 60 61 DEF_TEST(DrawText, reporter) { 62 SkPaint paint; 63 paint.setColor(SK_ColorGRAY); 64 paint.setTextSize(SkIntToScalar(20)); 65 66 SkIRect drawTextRect = SkIRect::MakeWH(64, 64); 67 SkBitmap drawTextBitmap; 68 create(&drawTextBitmap, drawTextRect); 69 SkCanvas drawTextCanvas(drawTextBitmap); 70 71 SkIRect drawPosTextRect = SkIRect::MakeWH(64, 64); 72 SkBitmap drawPosTextBitmap; 73 create(&drawPosTextBitmap, drawPosTextRect); 74 SkCanvas drawPosTextCanvas(drawPosTextBitmap); 75 76 // Two test cases "A" for the normal path through the code, and " " to check the 77 // early return path. 78 const char* cases[] = {"A", " "}; 79 for (auto c : cases) { 80 for (float offsetY = 0.0f; offsetY < 1.0f; offsetY += (1.0f / 16.0f)) { 81 for (float offsetX = 0.0f; offsetX < 1.0f; offsetX += (1.0f / 16.0f)) { 82 SkPoint point = SkPoint::Make(25.0f + offsetX, 83 25.0f + offsetY); 84 85 for (int align = 0; align < SkPaint::kAlignCount; ++align) { 86 paint.setTextAlign(static_cast<SkPaint::Align>(align)); 87 88 for (unsigned int flags = 0; flags < (1 << 3); ++flags) { 89 static const unsigned int antiAliasFlag = 1; 90 static const unsigned int subpixelFlag = 1 << 1; 91 static const unsigned int lcdFlag = 1 << 2; 92 93 paint.setAntiAlias(SkToBool(flags & antiAliasFlag)); 94 paint.setSubpixelText(SkToBool(flags & subpixelFlag)); 95 paint.setLCDRenderText(SkToBool(flags & lcdFlag)); 96 97 // Test: drawText and drawPosText draw the same. 98 drawBG(&drawTextCanvas); 99 drawTextCanvas.drawText(c, 1, point.fX, point.fY, paint); 100 101 drawBG(&drawPosTextCanvas); 102 drawPosTextCanvas.drawPosText(c, 1, &point, paint); 103 104 REPORTER_ASSERT(reporter, 105 compare(drawTextBitmap, drawTextRect, 106 drawPosTextBitmap, drawPosTextRect)); 107 } 108 } 109 } 110 } 111 } 112 } 113 114 // Test drawing text at some unusual coordinates. 115 // We measure success by not crashing or asserting. 116 DEF_TEST(DrawText_weirdCoordinates, r) { 117 auto surface = SkSurface::MakeRasterN32Premul(10,10); 118 auto canvas = surface->getCanvas(); 119 120 SkScalar oddballs[] = { 0.0f, (float)INFINITY, (float)NAN, 34359738368.0f }; 121 122 for (auto x : oddballs) { 123 canvas->drawString("a", +x, 0.0f, SkPaint()); 124 canvas->drawString("a", -x, 0.0f, SkPaint()); 125 } 126 for (auto y : oddballs) { 127 canvas->drawString("a", 0.0f, +y, SkPaint()); 128 canvas->drawString("a", 0.0f, -y, SkPaint()); 129 } 130 } 131 132 // Test drawing text with some unusual matricies. 133 // We measure success by not crashing or asserting. 134 DEF_TEST(DrawText_weirdMatricies, r) { 135 auto surface = SkSurface::MakeRasterN32Premul(100,100); 136 auto canvas = surface->getCanvas(); 137 138 SkPaint paint; 139 paint.setAntiAlias(true); 140 paint.setLCDRenderText(true); 141 142 struct { 143 SkScalar textSize; 144 SkScalar matrix[9]; 145 } testCases[] = { 146 // 2x2 singular 147 {10, { 0, 0, 0, 0, 0, 0, 0, 0, 1}}, 148 {10, { 0, 0, 0, 0, 1, 0, 0, 0, 1}}, 149 {10, { 0, 0, 0, 1, 0, 0, 0, 0, 1}}, 150 {10, { 0, 0, 0, 1, 1, 0, 0, 0, 1}}, 151 {10, { 0, 1, 0, 0, 1, 0, 0, 0, 1}}, 152 {10, { 1, 0, 0, 0, 0, 0, 0, 0, 1}}, 153 {10, { 1, 0, 0, 1, 0, 0, 0, 0, 1}}, 154 {10, { 1, 1, 0, 0, 0, 0, 0, 0, 1}}, 155 {10, { 1, 1, 0, 1, 1, 0, 0, 0, 1}}, 156 // See https://bugzilla.mozilla.org/show_bug.cgi?id=1305085 . 157 { 1, {10, 20, 0, 20, 40, 0, 0, 0, 1}}, 158 }; 159 160 for (const auto& testCase : testCases) { 161 paint.setTextSize(testCase.textSize); 162 const SkScalar(&m)[9] = testCase.matrix; 163 SkMatrix mat; 164 mat.setAll(m[0], m[1], m[2], m[3], m[4], m[5], m[6], m[7], m[8]); 165 canvas->setMatrix(mat); 166 canvas->drawString("Hamburgefons", 10, 10, paint); 167 } 168 } 169
