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TestScaling.cpp
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TestScaling.cpp
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "TestScaling.h"
#include "ImageScaling.h"
using namespace mozilla::gfx;
TestScaling::TestScaling() {
REGISTER_TEST(TestScaling, BasicHalfScale);
REGISTER_TEST(TestScaling, DoubleHalfScale);
REGISTER_TEST(TestScaling, UnevenHalfScale);
REGISTER_TEST(TestScaling, OddStrideHalfScale);
REGISTER_TEST(TestScaling, VerticalHalfScale);
REGISTER_TEST(TestScaling, HorizontalHalfScale);
REGISTER_TEST(TestScaling, MixedHalfScale);
}
void TestScaling::BasicHalfScale() {
std::vector<uint8_t> data;
data.resize(500 * 500 * 4);
uint32_t* pixels = reinterpret_cast<uint32_t*>(&data.front());
for (int y = 0; y < 500; y += 2) {
for (int x = 0; x < 500; x += 2) {
pixels[y * 500 + x] = 0xff00ff00;
pixels[y * 500 + x + 1] = 0xff00ffff;
pixels[(y + 1) * 500 + x] = 0xff000000;
pixels[(y + 1) * 500 + x + 1] = 0xff0000ff;
}
}
ImageHalfScaler scaler(&data.front(), 500 * 4, IntSize(500, 500));
scaler.ScaleForSize(IntSize(220, 240));
VERIFY(scaler.GetSize().width == 250);
VERIFY(scaler.GetSize().height == 250);
pixels = (uint32_t*)scaler.GetScaledData();
for (int y = 0; y < 250; y++) {
for (int x = 0; x < 250; x++) {
VERIFY(pixels[y * (scaler.GetStride() / 4) + x] == 0xff007f7f);
}
}
}
void TestScaling::DoubleHalfScale() {
std::vector<uint8_t> data;
data.resize(500 * 500 * 4);
uint32_t* pixels = reinterpret_cast<uint32_t*>(&data.front());
for (int y = 0; y < 500; y += 2) {
for (int x = 0; x < 500; x += 2) {
pixels[y * 500 + x] = 0xff00ff00;
pixels[y * 500 + x + 1] = 0xff00ffff;
pixels[(y + 1) * 500 + x] = 0xff000000;
pixels[(y + 1) * 500 + x + 1] = 0xff0000ff;
}
}
ImageHalfScaler scaler(&data.front(), 500 * 4, IntSize(500, 500));
scaler.ScaleForSize(IntSize(120, 110));
VERIFY(scaler.GetSize().width == 125);
VERIFY(scaler.GetSize().height == 125);
pixels = (uint32_t*)scaler.GetScaledData();
for (int y = 0; y < 125; y++) {
for (int x = 0; x < 125; x++) {
VERIFY(pixels[y * (scaler.GetStride() / 4) + x] == 0xff007f7f);
}
}
}
void TestScaling::UnevenHalfScale() {
std::vector<uint8_t> data;
// Use a 16-byte aligned stride still, we test none-aligned strides
// separately.
data.resize(499 * 500 * 4);
uint32_t* pixels = reinterpret_cast<uint32_t*>(&data.front());
for (int y = 0; y < 500; y += 2) {
for (int x = 0; x < 500; x += 2) {
pixels[y * 500 + x] = 0xff00ff00;
if (x < 498) {
pixels[y * 500 + x + 1] = 0xff00ffff;
}
if (y < 498) {
pixels[(y + 1) * 500 + x] = 0xff000000;
if (x < 498) {
pixels[(y + 1) * 500 + x + 1] = 0xff0000ff;
}
}
}
}
ImageHalfScaler scaler(&data.front(), 500 * 4, IntSize(499, 499));
scaler.ScaleForSize(IntSize(220, 220));
VERIFY(scaler.GetSize().width == 249);
VERIFY(scaler.GetSize().height == 249);
pixels = (uint32_t*)scaler.GetScaledData();
for (int y = 0; y < 249; y++) {
for (int x = 0; x < 249; x++) {
VERIFY(pixels[y * (scaler.GetStride() / 4) + x] == 0xff007f7f);
}
}
}
void TestScaling::OddStrideHalfScale() {
std::vector<uint8_t> data;
// Use a 4-byte aligned stride to test if that doesn't cause any issues.
data.resize(499 * 499 * 4);
uint32_t* pixels = reinterpret_cast<uint32_t*>(&data.front());
for (int y = 0; y < 500; y += 2) {
for (int x = 0; x < 500; x += 2) {
pixels[y * 499 + x] = 0xff00ff00;
if (x < 498) {
pixels[y * 499 + x + 1] = 0xff00ffff;
}
if (y < 498) {
pixels[(y + 1) * 499 + x] = 0xff000000;
if (x < 498) {
pixels[(y + 1) * 499 + x + 1] = 0xff0000ff;
}
}
}
}
ImageHalfScaler scaler(&data.front(), 499 * 4, IntSize(499, 499));
scaler.ScaleForSize(IntSize(220, 220));
VERIFY(scaler.GetSize().width == 249);
VERIFY(scaler.GetSize().height == 249);
pixels = (uint32_t*)scaler.GetScaledData();
for (int y = 0; y < 249; y++) {
for (int x = 0; x < 249; x++) {
VERIFY(pixels[y * (scaler.GetStride() / 4) + x] == 0xff007f7f);
}
}
}
void TestScaling::VerticalHalfScale() {
std::vector<uint8_t> data;
data.resize(500 * 500 * 4);
uint32_t* pixels = reinterpret_cast<uint32_t*>(&data.front());
for (int y = 0; y < 500; y += 2) {
for (int x = 0; x < 500; x += 2) {
pixels[y * 500 + x] = 0xff00ff00;
pixels[y * 500 + x + 1] = 0xff00ffff;
pixels[(y + 1) * 500 + x] = 0xff000000;
pixels[(y + 1) * 500 + x + 1] = 0xff0000ff;
}
}
ImageHalfScaler scaler(&data.front(), 500 * 4, IntSize(500, 500));
scaler.ScaleForSize(IntSize(400, 240));
VERIFY(scaler.GetSize().width == 500);
VERIFY(scaler.GetSize().height == 250);
pixels = (uint32_t*)scaler.GetScaledData();
for (int y = 0; y < 250; y++) {
for (int x = 0; x < 500; x += 2) {
VERIFY(pixels[y * (scaler.GetStride() / 4) + x] == 0xff007f00);
VERIFY(pixels[y * (scaler.GetStride() / 4) + x + 1] == 0xff007fff);
}
}
}
void TestScaling::HorizontalHalfScale() {
std::vector<uint8_t> data;
data.resize(520 * 500 * 4);
uint32_t* pixels = reinterpret_cast<uint32_t*>(&data.front());
for (int y = 0; y < 500; y++) {
for (int x = 0; x < 520; x += 8) {
pixels[y * 520 + x] = 0xff00ff00;
pixels[y * 520 + x + 1] = 0xff00ffff;
pixels[y * 520 + x + 2] = 0xff000000;
pixels[y * 520 + x + 3] = 0xff0000ff;
pixels[y * 520 + x + 4] = 0xffff00ff;
pixels[y * 520 + x + 5] = 0xff0000ff;
pixels[y * 520 + x + 6] = 0xffffffff;
pixels[y * 520 + x + 7] = 0xff0000ff;
}
}
ImageHalfScaler scaler(&data.front(), 520 * 4, IntSize(520, 500));
scaler.ScaleForSize(IntSize(240, 400));
VERIFY(scaler.GetSize().width == 260);
VERIFY(scaler.GetSize().height == 500);
pixels = (uint32_t*)scaler.GetScaledData();
for (int y = 0; y < 500; y++) {
for (int x = 0; x < 260; x += 4) {
VERIFY(pixels[y * (scaler.GetStride() / 4) + x] == 0xff00ff7f);
VERIFY(pixels[y * (scaler.GetStride() / 4) + x + 1] == 0xff00007f);
VERIFY(pixels[y * (scaler.GetStride() / 4) + x + 2] == 0xff7f00ff);
VERIFY(pixels[y * (scaler.GetStride() / 4) + x + 3] == 0xff7f7fff);
}
}
}
void TestScaling::MixedHalfScale() {
std::vector<uint8_t> data;
data.resize(500 * 500 * 4);
uint32_t* pixels = reinterpret_cast<uint32_t*>(&data.front());
for (int y = 0; y < 500; y += 2) {
for (int x = 0; x < 500; x += 2) {
pixels[y * 500 + x] = 0xff00ff00;
pixels[y * 500 + x + 1] = 0xff00ffff;
pixels[(y + 1) * 500 + x] = 0xff000000;
pixels[(y + 1) * 500 + x + 1] = 0xff0000ff;
}
}
ImageHalfScaler scaler(&data.front(), 500 * 4, IntSize(500, 500));
scaler.ScaleForSize(IntSize(120, 240));
VERIFY(scaler.GetSize().width == 125);
VERIFY(scaler.GetSize().height == 250);
scaler.ScaleForSize(IntSize(240, 120));
VERIFY(scaler.GetSize().width == 250);
VERIFY(scaler.GetSize().height == 125);
}