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      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     SkShader* shader = SkShader::CreateBitmapShader(bmp,
     21         SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);
     22     REPORTER_ASSERT(reporter, shader);
     23     REPORTER_ASSERT(reporter, !shader->isOpaque());
     24     shader->unref();
     25 
     26     // From this point on, we have pixels
     27     bmp.allocPixels(info);
     28 
     29     // test 2: not opaque by default
     30     shader = SkShader::CreateBitmapShader(bmp,
     31         SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);
     32     REPORTER_ASSERT(reporter, shader);
     33     REPORTER_ASSERT(reporter, !shader->isOpaque());
     34     shader->unref();
     35 
     36     // test 3: explicitly opaque
     37     bmp.setAlphaType(kOpaque_SkAlphaType);
     38     shader = SkShader::CreateBitmapShader(bmp,
     39         SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);
     40     REPORTER_ASSERT(reporter, shader);
     41     REPORTER_ASSERT(reporter, shader->isOpaque());
     42     shader->unref();
     43 
     44     // test 4: explicitly not opaque
     45     bmp.setAlphaType(kPremul_SkAlphaType);
     46     shader = SkShader::CreateBitmapShader(bmp,
     47         SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);
     48     REPORTER_ASSERT(reporter, shader);
     49     REPORTER_ASSERT(reporter, !shader->isOpaque());
     50     shader->unref();
     51 
     52 }
     53 
     54 static void test_gradient(skiatest::Reporter* reporter)
     55 {
     56     SkPoint pts[2];
     57     pts[0].iset(0, 0);
     58     pts[1].iset(1, 0);
     59     SkColor colors[2];
     60     SkScalar pos[2] = {SkIntToScalar(0), SkIntToScalar(1)};
     61     int count = 2;
     62     SkShader::TileMode mode = SkShader::kClamp_TileMode;
     63 
     64     // test 1: all opaque
     65     colors[0] = SkColorSetARGB(0xFF, 0, 0, 0);
     66     colors[1] = SkColorSetARGB(0xFF, 0, 0, 0);
     67     SkShader* grad = SkGradientShader::CreateLinear(pts, colors, pos, count,
     68                                                     mode);
     69     REPORTER_ASSERT(reporter, grad);
     70     REPORTER_ASSERT(reporter, grad->isOpaque());
     71     grad->unref();
     72 
     73     // test 2: all 0 alpha
     74     colors[0] = SkColorSetARGB(0, 0, 0, 0);
     75     colors[1] = SkColorSetARGB(0, 0, 0, 0);
     76     grad = SkGradientShader::CreateLinear(pts, colors, pos, count, mode);
     77     REPORTER_ASSERT(reporter, grad);
     78     REPORTER_ASSERT(reporter, !grad->isOpaque());
     79     grad->unref();
     80 
     81     // test 3: one opaque, one transparent
     82     colors[0] = SkColorSetARGB(0xFF, 0, 0, 0);
     83     colors[1] = SkColorSetARGB(0x40, 0, 0, 0);
     84     grad = SkGradientShader::CreateLinear(pts, colors, pos, count, mode);
     85     REPORTER_ASSERT(reporter, grad);
     86     REPORTER_ASSERT(reporter, !grad->isOpaque());
     87     grad->unref();
     88 
     89     // test 4: test 3, swapped
     90     colors[0] = SkColorSetARGB(0x40, 0, 0, 0);
     91     colors[1] = SkColorSetARGB(0xFF, 0, 0, 0);
     92     grad = SkGradientShader::CreateLinear(pts, colors, pos, count, mode);
     93     REPORTER_ASSERT(reporter, grad);
     94     REPORTER_ASSERT(reporter, !grad->isOpaque());
     95     grad->unref();
     96 }
     97 
     98 static void test_color(skiatest::Reporter* reporter)
     99 {
    100     SkColorShader colorShader1(SkColorSetARGB(0,0,0,0));
    101     REPORTER_ASSERT(reporter, !colorShader1.isOpaque());
    102     SkColorShader colorShader2(SkColorSetARGB(0xFF,0,0,0));
    103     REPORTER_ASSERT(reporter, colorShader2.isOpaque());
    104     SkColorShader colorShader3(SkColorSetARGB(0x7F,0,0,0));
    105     REPORTER_ASSERT(reporter, !colorShader3.isOpaque());
    106 }
    107 
    108 DEF_TEST(ShaderOpacity, reporter) {
    109     test_gradient(reporter);
    110     test_color(reporter);
    111     test_bitmap(reporter);
    112 }
    113