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 "SkColorShader.h" 10 #include "SkGradientShader.h" 11 #include "SkShader.h" 12 #include "Test.h" 13 14 static void test_bitmap(skiatest::Reporter* reporter) { 15 SkImageInfo info = SkImageInfo::MakeN32Premul(2, 2); 16 17 SkBitmap bmp; 18 bmp.setInfo(info); 19 20 // test 1: bitmap without pixel data 21 auto shader = SkShader::MakeBitmapShader(bmp, 22 SkShader::kClamp_TileMode, SkShader::kClamp_TileMode); 23 REPORTER_ASSERT(reporter, shader); 24 REPORTER_ASSERT(reporter, !shader->isOpaque()); 25 26 // From this point on, we have pixels 27 bmp.allocPixels(info); 28 29 // test 2: not opaque by default 30 shader = SkShader::MakeBitmapShader(bmp, 31 SkShader::kClamp_TileMode, SkShader::kClamp_TileMode); 32 REPORTER_ASSERT(reporter, shader); 33 REPORTER_ASSERT(reporter, !shader->isOpaque()); 34 35 // test 3: explicitly opaque 36 bmp.setAlphaType(kOpaque_SkAlphaType); 37 shader = SkShader::MakeBitmapShader(bmp, 38 SkShader::kClamp_TileMode, SkShader::kClamp_TileMode); 39 REPORTER_ASSERT(reporter, shader); 40 REPORTER_ASSERT(reporter, shader->isOpaque()); 41 42 // test 4: explicitly not opaque 43 bmp.setAlphaType(kPremul_SkAlphaType); 44 shader = SkShader::MakeBitmapShader(bmp, 45 SkShader::kClamp_TileMode, SkShader::kClamp_TileMode); 46 REPORTER_ASSERT(reporter, shader); 47 REPORTER_ASSERT(reporter, !shader->isOpaque()); 48 } 49 50 static void test_gradient(skiatest::Reporter* reporter) { 51 SkPoint pts[2]; 52 pts[0].iset(0, 0); 53 pts[1].iset(1, 0); 54 SkColor colors[2]; 55 SkScalar pos[2] = {SkIntToScalar(0), SkIntToScalar(1)}; 56 int count = 2; 57 SkShader::TileMode mode = SkShader::kClamp_TileMode; 58 59 // test 1: all opaque 60 colors[0] = SkColorSetARGB(0xFF, 0, 0, 0); 61 colors[1] = SkColorSetARGB(0xFF, 0, 0, 0); 62 auto grad = SkGradientShader::MakeLinear(pts, colors, pos, count, mode); 63 REPORTER_ASSERT(reporter, grad); 64 REPORTER_ASSERT(reporter, grad->isOpaque()); 65 66 // test 2: all 0 alpha 67 colors[0] = SkColorSetARGB(0, 0, 0, 0); 68 colors[1] = SkColorSetARGB(0, 0, 0, 0); 69 grad = SkGradientShader::MakeLinear(pts, colors, pos, count, mode); 70 REPORTER_ASSERT(reporter, grad); 71 REPORTER_ASSERT(reporter, !grad->isOpaque()); 72 73 // test 3: one opaque, one transparent 74 colors[0] = SkColorSetARGB(0xFF, 0, 0, 0); 75 colors[1] = SkColorSetARGB(0x40, 0, 0, 0); 76 grad = SkGradientShader::MakeLinear(pts, colors, pos, count, mode); 77 REPORTER_ASSERT(reporter, grad); 78 REPORTER_ASSERT(reporter, !grad->isOpaque()); 79 80 // test 4: test 3, swapped 81 colors[0] = SkColorSetARGB(0x40, 0, 0, 0); 82 colors[1] = SkColorSetARGB(0xFF, 0, 0, 0); 83 grad = SkGradientShader::MakeLinear(pts, colors, pos, count, mode); 84 REPORTER_ASSERT(reporter, grad); 85 REPORTER_ASSERT(reporter, !grad->isOpaque()); 86 } 87 88 static void test_color(skiatest::Reporter* reporter) { 89 SkColorShader colorShader1(SkColorSetARGB(0,0,0,0)); 90 REPORTER_ASSERT(reporter, !colorShader1.isOpaque()); 91 SkColorShader colorShader2(SkColorSetARGB(0xFF,0,0,0)); 92 REPORTER_ASSERT(reporter, colorShader2.isOpaque()); 93 SkColorShader colorShader3(SkColorSetARGB(0x7F,0,0,0)); 94 REPORTER_ASSERT(reporter, !colorShader3.isOpaque()); 95 } 96 97 DEF_TEST(ShaderOpacity, reporter) { 98 test_gradient(reporter); 99 test_color(reporter); 100 test_bitmap(reporter); 101 } 102
