blob: 13357b3aeb9935aa633509d2f1ca216ffe8144c3 [file] [log] [blame]
/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "include/core/SkBitmap.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkShader.h"
#include "include/core/SkSurface.h"
#include "include/effects/SkGradientShader.h"
#include "src/shaders/SkColorShader.h"
#include "tests/Test.h"
#include "tools/ToolUtils.h"
static void test_bitmap(skiatest::Reporter* reporter) {
SkImageInfo info = SkImageInfo::MakeN32Premul(2, 2);
SkBitmap bmp;
bmp.setInfo(info);
// test 1: bitmap without pixel data
auto shader = bmp.makeShader(SkTileMode::kClamp, SkTileMode::kClamp);
REPORTER_ASSERT(reporter, shader);
REPORTER_ASSERT(reporter, !shader->isOpaque());
// From this point on, we have pixels
bmp.allocPixels(info);
// test 2: not opaque by default
shader = bmp.makeShader();
REPORTER_ASSERT(reporter, shader);
REPORTER_ASSERT(reporter, !shader->isOpaque());
// test 3: explicitly opaque
bmp.setAlphaType(kOpaque_SkAlphaType);
shader = bmp.makeShader();
REPORTER_ASSERT(reporter, shader);
REPORTER_ASSERT(reporter, shader->isOpaque());
// test 4: explicitly not opaque
bmp.setAlphaType(kPremul_SkAlphaType);
shader = bmp.makeShader();
REPORTER_ASSERT(reporter, shader);
REPORTER_ASSERT(reporter, !shader->isOpaque());
}
static void test_gradient(skiatest::Reporter* reporter) {
SkPoint pts[2];
pts[0].iset(0, 0);
pts[1].iset(1, 0);
SkColor colors[2];
SkScalar pos[2] = {SkIntToScalar(0), SkIntToScalar(1)};
int count = 2;
SkTileMode mode = SkTileMode::kClamp;
// test 1: all opaque
colors[0] = SkColorSetARGB(0xFF, 0, 0, 0);
colors[1] = SkColorSetARGB(0xFF, 0, 0, 0);
auto grad = SkGradientShader::MakeLinear(pts, colors, pos, count, mode);
REPORTER_ASSERT(reporter, grad);
REPORTER_ASSERT(reporter, grad->isOpaque());
// test 2: all 0 alpha
colors[0] = SkColorSetARGB(0, 0, 0, 0);
colors[1] = SkColorSetARGB(0, 0, 0, 0);
grad = SkGradientShader::MakeLinear(pts, colors, pos, count, mode);
REPORTER_ASSERT(reporter, grad);
REPORTER_ASSERT(reporter, !grad->isOpaque());
// test 3: one opaque, one transparent
colors[0] = SkColorSetARGB(0xFF, 0, 0, 0);
colors[1] = SkColorSetARGB(0x40, 0, 0, 0);
grad = SkGradientShader::MakeLinear(pts, colors, pos, count, mode);
REPORTER_ASSERT(reporter, grad);
REPORTER_ASSERT(reporter, !grad->isOpaque());
// test 4: test 3, swapped
colors[0] = SkColorSetARGB(0x40, 0, 0, 0);
colors[1] = SkColorSetARGB(0xFF, 0, 0, 0);
grad = SkGradientShader::MakeLinear(pts, colors, pos, count, mode);
REPORTER_ASSERT(reporter, grad);
REPORTER_ASSERT(reporter, !grad->isOpaque());
}
static void test_color(skiatest::Reporter* reporter) {
SkColorShader colorShader1(SkColorSetARGB(0,0,0,0));
REPORTER_ASSERT(reporter, !colorShader1.isOpaque());
SkColorShader colorShader2(SkColorSetARGB(0xFF,0,0,0));
REPORTER_ASSERT(reporter, colorShader2.isOpaque());
SkColorShader colorShader3(SkColorSetARGB(0x7F,0,0,0));
REPORTER_ASSERT(reporter, !colorShader3.isOpaque());
}
DEF_TEST(ShaderOpacity, reporter) {
test_gradient(reporter);
test_color(reporter);
test_bitmap(reporter);
}
DEF_TEST(image_shader_filtering, reporter) {
auto make_checker_img = [](int w, int h) {
auto info = SkImageInfo::Make(w, h, kRGBA_8888_SkColorType, kOpaque_SkAlphaType);
auto surf = SkSurface::MakeRaster(info);
ToolUtils::draw_checkerboard(surf->getCanvas(), SK_ColorRED, SK_ColorBLUE, 2);
return surf->makeImageSnapshot();
};
auto img = make_checker_img(4, 4);
const SkFilterQuality quals[] = {
kNone_SkFilterQuality,
kLow_SkFilterQuality,
kMedium_SkFilterQuality,
kHigh_SkFilterQuality,
};
const SkScalar scales[] = { 3.0f, 1.0f, 0.5f, 0.25f, 0.125f };
auto make_img = [&](const SkPaint& paint) {
auto info = SkImageInfo::Make(70, 70, kRGBA_8888_SkColorType, kPremul_SkAlphaType);
auto surf = SkSurface::MakeRaster(info);
auto canvas = surf->getCanvas();
canvas->scale(1.06f, 1.06f); // nicely exaggerates noise when not filtering
canvas->drawRect({0, 0, 64, 64}, paint);
return surf->makeImageSnapshot();
};
SkPaint paint;
for (auto q : quals) {
for (auto scale : scales) {
SkMatrix m = SkMatrix::Scale(scale, scale);
paint.setFilterQuality(kNone_SkFilterQuality); // this setting should be ignored
paint.setShader(img->makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat, &m, q));
auto img0 = make_img(paint);
paint.setFilterQuality(q); // this should (still) be ignored
auto img1 = make_img(paint);
// make legacy form of shader, relying on the paint's filter-quality (q)
paint.setShader(img->makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat, &m));
auto img2 = make_img(paint);
REPORTER_ASSERT(reporter, ToolUtils::equal_pixels(img0.get(), img1.get()));
REPORTER_ASSERT(reporter, ToolUtils::equal_pixels(img0.get(), img2.get()));
}
}
}