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 "SkColorShader.h" 9 #include "SkGradientShader.h" 10 #include "SkShader.h" 11 #include "Test.h" 12 13 static void test_bitmap(skiatest::Reporter* reporter) { 14 SkImageInfo info = SkImageInfo::MakeN32Premul(2, 2); 15 16 SkBitmap bmp; 17 bmp.setInfo(info); 18 19 // test 1: bitmap without pixel data 20 auto shader = SkShader::MakeBitmapShader(bmp, 21 SkShader::kClamp_TileMode, SkShader::kClamp_TileMode); 22 REPORTER_ASSERT(reporter, shader); 23 REPORTER_ASSERT(reporter, !shader->isOpaque()); 24 25 // From this point on, we have pixels 26 bmp.allocPixels(info); 27 28 // test 2: not opaque by default 29 shader = SkShader::MakeBitmapShader(bmp, 30 SkShader::kClamp_TileMode, SkShader::kClamp_TileMode); 31 REPORTER_ASSERT(reporter, shader); 32 REPORTER_ASSERT(reporter, !shader->isOpaque()); 33 34 // test 3: explicitly opaque 35 bmp.setAlphaType(kOpaque_SkAlphaType); 36 shader = SkShader::MakeBitmapShader(bmp, 37 SkShader::kClamp_TileMode, SkShader::kClamp_TileMode); 38 REPORTER_ASSERT(reporter, shader); 39 REPORTER_ASSERT(reporter, shader->isOpaque()); 40 41 // test 4: explicitly not opaque 42 bmp.setAlphaType(kPremul_SkAlphaType); 43 shader = SkShader::MakeBitmapShader(bmp, 44 SkShader::kClamp_TileMode, SkShader::kClamp_TileMode); 45 REPORTER_ASSERT(reporter, shader); 46 REPORTER_ASSERT(reporter, !shader->isOpaque()); 47 } 48 49 static void test_gradient(skiatest::Reporter* reporter) { 50 SkPoint pts[2]; 51 pts[0].iset(0, 0); 52 pts[1].iset(1, 0); 53 SkColor colors[2]; 54 SkScalar pos[2] = {SkIntToScalar(0), SkIntToScalar(1)}; 55 int count = 2; 56 SkShader::TileMode mode = SkShader::kClamp_TileMode; 57 58 // test 1: all opaque 59 colors[0] = SkColorSetARGB(0xFF, 0, 0, 0); 60 colors[1] = SkColorSetARGB(0xFF, 0, 0, 0); 61 auto grad = SkGradientShader::MakeLinear(pts, colors, pos, count, mode); 62 REPORTER_ASSERT(reporter, grad); 63 REPORTER_ASSERT(reporter, grad->isOpaque()); 64 65 // test 2: all 0 alpha 66 colors[0] = SkColorSetARGB(0, 0, 0, 0); 67 colors[1] = SkColorSetARGB(0, 0, 0, 0); 68 grad = SkGradientShader::MakeLinear(pts, colors, pos, count, mode); 69 REPORTER_ASSERT(reporter, grad); 70 REPORTER_ASSERT(reporter, !grad->isOpaque()); 71 72 // test 3: one opaque, one transparent 73 colors[0] = SkColorSetARGB(0xFF, 0, 0, 0); 74 colors[1] = SkColorSetARGB(0x40, 0, 0, 0); 75 grad = SkGradientShader::MakeLinear(pts, colors, pos, count, mode); 76 REPORTER_ASSERT(reporter, grad); 77 REPORTER_ASSERT(reporter, !grad->isOpaque()); 78 79 // test 4: test 3, swapped 80 colors[0] = SkColorSetARGB(0x40, 0, 0, 0); 81 colors[1] = SkColorSetARGB(0xFF, 0, 0, 0); 82 grad = SkGradientShader::MakeLinear(pts, colors, pos, count, mode); 83 REPORTER_ASSERT(reporter, grad); 84 REPORTER_ASSERT(reporter, !grad->isOpaque()); 85 } 86 87 static void test_color(skiatest::Reporter* reporter) { 88 SkColorShader colorShader1(SkColorSetARGB(0,0,0,0)); 89 REPORTER_ASSERT(reporter, !colorShader1.isOpaque()); 90 SkColorShader colorShader2(SkColorSetARGB(0xFF,0,0,0)); 91 REPORTER_ASSERT(reporter, colorShader2.isOpaque()); 92 SkColorShader colorShader3(SkColorSetARGB(0x7F,0,0,0)); 93 REPORTER_ASSERT(reporter, !colorShader3.isOpaque()); 94 } 95 96 DEF_TEST(ShaderOpacity, reporter) { 97 test_gradient(reporter); 98 test_color(reporter); 99 test_bitmap(reporter); 100 } 101
