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      1 
      2 /*
      3  * Copyright 2011 Google Inc.
      4  *
      5  * Use of this source code is governed by a BSD-style license that can be
      6  * found in the LICENSE file.
      7  */
      8 #include "Test.h"
      9 #include "SkShader.h"
     10 #include "SkGradientShader.h"
     11 #include "SkColorShader.h"
     12 
     13 static void test_bitmap(skiatest::Reporter* reporter) {
     14     SkBitmap bmp;
     15     bmp.setConfig(SkBitmap::kARGB_8888_Config, 2, 2);
     16 
     17     // test 1: bitmap without pixel data
     18     SkShader* shader = SkShader::CreateBitmapShader(bmp,
     19         SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);
     20     REPORTER_ASSERT(reporter, shader);
     21     REPORTER_ASSERT(reporter, !shader->isOpaque());
     22     shader->unref();
     23 
     24     // From this point on, we have pixels
     25     bmp.allocPixels();
     26 
     27     // test 2: not opaque by default
     28     shader = SkShader::CreateBitmapShader(bmp,
     29         SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);
     30     REPORTER_ASSERT(reporter, shader);
     31     REPORTER_ASSERT(reporter, !shader->isOpaque());
     32     shader->unref();
     33 
     34     // test 3: explicitly opaque
     35     bmp.setIsOpaque(true);
     36     shader = SkShader::CreateBitmapShader(bmp,
     37         SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);
     38     REPORTER_ASSERT(reporter, shader);
     39     REPORTER_ASSERT(reporter, shader->isOpaque());
     40     shader->unref();
     41 
     42     // test 4: explicitly not opaque
     43     bmp.setIsOpaque(false);
     44     shader = SkShader::CreateBitmapShader(bmp,
     45         SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);
     46     REPORTER_ASSERT(reporter, shader);
     47     REPORTER_ASSERT(reporter, !shader->isOpaque());
     48     shader->unref();
     49 
     50 }
     51 
     52 static void test_gradient(skiatest::Reporter* reporter)
     53 {
     54     SkPoint pts[2];
     55     pts[0].iset(0, 0);
     56     pts[1].iset(1, 0);
     57     SkColor colors[2];
     58     SkScalar pos[2] = {SkIntToScalar(0), SkIntToScalar(1)};
     59     int count = 2;
     60     SkShader::TileMode mode = SkShader::kClamp_TileMode;
     61 
     62     // test 1: all opaque
     63     colors[0] = SkColorSetARGB(0xFF, 0, 0, 0);
     64     colors[1] = SkColorSetARGB(0xFF, 0, 0, 0);
     65     SkShader* grad = SkGradientShader::CreateLinear(pts, colors, pos, count,
     66                                                     mode);
     67     REPORTER_ASSERT(reporter, grad);
     68     REPORTER_ASSERT(reporter, grad->isOpaque());
     69     grad->unref();
     70 
     71     // test 2: all 0 alpha
     72     colors[0] = SkColorSetARGB(0, 0, 0, 0);
     73     colors[1] = SkColorSetARGB(0, 0, 0, 0);
     74     grad = SkGradientShader::CreateLinear(pts, colors, pos, count, mode);
     75     REPORTER_ASSERT(reporter, grad);
     76     REPORTER_ASSERT(reporter, !grad->isOpaque());
     77     grad->unref();
     78 
     79     // test 3: one opaque, one transparent
     80     colors[0] = SkColorSetARGB(0xFF, 0, 0, 0);
     81     colors[1] = SkColorSetARGB(0x40, 0, 0, 0);
     82     grad = SkGradientShader::CreateLinear(pts, colors, pos, count, mode);
     83     REPORTER_ASSERT(reporter, grad);
     84     REPORTER_ASSERT(reporter, !grad->isOpaque());
     85     grad->unref();
     86 
     87     // test 4: test 3, swapped
     88     colors[0] = SkColorSetARGB(0x40, 0, 0, 0);
     89     colors[1] = SkColorSetARGB(0xFF, 0, 0, 0);
     90     grad = SkGradientShader::CreateLinear(pts, colors, pos, count, mode);
     91     REPORTER_ASSERT(reporter, grad);
     92     REPORTER_ASSERT(reporter, !grad->isOpaque());
     93     grad->unref();
     94 }
     95 
     96 static void test_color(skiatest::Reporter* reporter)
     97 {
     98     SkColorShader colorShader1(SkColorSetARGB(0,0,0,0));
     99     REPORTER_ASSERT(reporter, !colorShader1.isOpaque());
    100     SkColorShader colorShader2(SkColorSetARGB(0xFF,0,0,0));
    101     REPORTER_ASSERT(reporter, colorShader2.isOpaque());
    102     SkColorShader colorShader3(SkColorSetARGB(0x7F,0,0,0));
    103     REPORTER_ASSERT(reporter, !colorShader3.isOpaque());
    104 
    105     // with inherrited color, shader must declare itself as opaque,
    106     // since lack of opacity will depend solely on the paint
    107     SkColorShader colorShader4;
    108     REPORTER_ASSERT(reporter, colorShader4.isOpaque());
    109 }
    110 
    111 static void test_shader_opacity(skiatest::Reporter* reporter)
    112 {
    113     test_gradient(reporter);
    114     test_color(reporter);
    115     test_bitmap(reporter);
    116 }
    117 
    118 #include "TestClassDef.h"
    119 DEFINE_TESTCLASS("ShaderOpacity", ShaderOpacityTestClass, test_shader_opacity)
    120