b40530ad3c
- Add new library to do tiff import/export. This library is different from imageio in that it doesn't pull in additional 3p libraries. This reduces binary size and reduces complexity in maintaining the android build (which depends on libs/viewer). - The encode() code has been moved from libs/viewer to libs/imageio-lite - encode/decode only handles the simplest case of uncompressed rgba.
243 lines
6.5 KiB
C++
243 lines
6.5 KiB
C++
/*
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* Copyright (C) 2026 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <imageio-lite/ImageDecoder.h>
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#include <imageio-lite/ImageEncoder.h>
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#include <image/LinearImage.h>
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#include <math/vec3.h>
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#include <math/vec4.h>
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#include <gtest/gtest.h>
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#include <sstream>
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using namespace image;
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using namespace imageio_lite;
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using namespace filament::math;
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class ImageIOLiteTest : public testing::Test {};
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TEST_F(ImageIOLiteTest, TIFFRoundTrip) {
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// Create a simple 4x4 image manually
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uint32_t w = 4;
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uint32_t h = 4;
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LinearImage src(w, h, 3);
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// Fill with a pattern: R, G, B, White
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// Row 0: Red
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// Row 1: Green
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// Row 2: Blue
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// Row 3: White
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for (int y = 0; y < h; ++y) {
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for (int x = 0; x < w; ++x) {
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float* p = src.getPixelRef(x, y);
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if (y == 0) {
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p[0] = 1;
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p[1] = 0;
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p[2] = 0;
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} else if (y == 1) {
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p[0] = 0;
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p[1] = 1;
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p[2] = 0;
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} else if (y == 2) {
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p[0] = 0;
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p[1] = 0;
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p[2] = 1;
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} else {
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p[0] = 1;
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p[1] = 1;
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p[2] = 1;
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}
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}
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}
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std::stringstream stream;
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// Encode to TIFF
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bool success = ImageEncoder::encode(stream, ImageEncoder::Format::TIFF, src, "", "test.tif");
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ASSERT_TRUE(success);
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// Decode from TIFF
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stream.seekg(0);
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LinearImage dst = ImageDecoder::decode(stream, "test.tif");
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ASSERT_EQ(dst.getWidth(), src.getWidth());
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ASSERT_EQ(dst.getHeight(), src.getHeight());
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// Since we go Linear -> sRGB (8-bit) -> Linear, there will be precision loss.
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// 1/255 is approx 0.004. So epsilon should be around that or slightly higher due to
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// conversions.
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float const epsilon = 0.01f;
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for (int y = 0; y < h; ++y) {
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for (int x = 0; x < w; ++x) {
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// src is 3 channels
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float* s_ptr = src.getPixelRef(x, y);
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float3 s = { s_ptr[0], s_ptr[1], s_ptr[2] };
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// dst is 4 channels (TIFF export forces RGBA)
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float* d_ptr = dst.getPixelRef(x, y);
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float4 d = { d_ptr[0], d_ptr[1], d_ptr[2], d_ptr[3] };
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EXPECT_NEAR(s.r, d.r, epsilon);
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EXPECT_NEAR(s.g, d.g, epsilon);
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EXPECT_NEAR(s.b, d.b, epsilon);
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EXPECT_NEAR(1.0f, d.a, epsilon);
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}
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}
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}
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TEST_F(ImageIOLiteTest, BigEndianTIFF) {
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std::vector<uint8_t> tiff = {
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0x4D,
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0x4D,
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0x00,
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0x2A,
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0x00,
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0x00,
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0x00,
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0x08, // Header (BE)
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};
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auto write16 = [&](uint16_t v) {
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tiff.push_back(v >> 8);
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tiff.push_back(v & 0xFF);
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};
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auto write32 = [&](uint32_t v) {
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tiff.push_back(v >> 24);
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tiff.push_back((v >> 16) & 0xFF);
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tiff.push_back((v >> 8) & 0xFF);
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tiff.push_back(v & 0xFF);
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};
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// IFD with mandatory tags
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write16(8); // Number of entries
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// ImageWidth (256), LONG (4), 1, 1
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write16(256);
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write16(4);
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write32(1);
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write32(1);
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// ImageLength (257), LONG (4), 1, 1
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write16(257);
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write16(4);
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write32(1);
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write32(1);
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// BitsPerSample (258), SHORT (3), 1, 8 (Left justified: 0x00080000)
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write16(258);
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write16(3);
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write32(1);
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write32(0x00080000);
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// Compression (259), SHORT (3), 1, 1 (Left justified)
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write16(259);
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write16(3);
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write32(1);
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write32(0x00010000);
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// PhotometricInterpretation (262), SHORT (3), 1, 2 (RGB) (Left justified)
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write16(262);
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write16(3);
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write32(1);
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write32(0x00020000);
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// StripOffsets (273), LONG (4), 1, 100 (Offset to data)
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write16(273);
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write16(4);
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write32(1);
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write32(200);
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// SamplesPerPixel (277), SHORT (3), 1, 3 (RGB) (Left justified)
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write16(277);
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write16(3);
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write32(1);
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write32(0x00030000); // 3 channels
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// StripByteCounts (279), LONG (4), 1, 3 (1 pixel * 3 bytes)
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write16(279);
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write16(4);
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write32(1);
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write32(3);
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write32(0); // Next IFD
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// Fill data until offset 200
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while (tiff.size() < 200) tiff.push_back(0);
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// Pixel data (RGB)
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tiff.push_back(0xFF);
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tiff.push_back(0x00);
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tiff.push_back(0x00);
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std::string s(tiff.begin(), tiff.end());
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std::stringstream stream(s);
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LinearImage dst = ImageDecoder::decode(stream, "be.tif");
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// If BE decoding works, this returns a valid image.
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// If it fails (e.g. BitsPerSample read as 0), it returns invalid image.
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ASSERT_TRUE(dst.isValid());
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ASSERT_EQ(dst.getWidth(), 1);
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ASSERT_EQ(dst.getHeight(), 1);
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}
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TEST_F(ImageIOLiteTest, MaliciousHugeStrips) {
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std::vector<uint8_t> tiff = {
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0x49,
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0x49,
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0x2A,
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0x00,
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0x08,
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0x00,
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0x00,
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0x00, // Header (LE)
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};
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auto write16 = [&](uint16_t v) {
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tiff.push_back(v & 0xFF);
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tiff.push_back(v >> 8);
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};
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auto write32 = [&](uint32_t v) {
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tiff.push_back(v & 0xFF);
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tiff.push_back((v >> 8) & 0xFF);
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tiff.push_back((v >> 16) & 0xFF);
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tiff.push_back(v >> 24);
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};
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write16(1); // 1 entry
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// StripOffsets (273), LONG (4), count=1000001, offset=0
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write16(273);
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write16(4);
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write32(1000001);
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write32(0);
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write32(0);
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std::string s(tiff.begin(), tiff.end());
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// We expect this to fail due to FILAMENT_CHECK_PRECONDITION.
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// In builds with exceptions, it throws. In builds without, it aborts.
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// EXPECT_DEATH expects an abort/crash. So we catch and abort if it throws.
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EXPECT_DEATH(
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{
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try {
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std::stringstream stream(s);
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ImageDecoder::decode(stream, "bad.tif");
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} catch (...) {
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std::abort();
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}
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},
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"");
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}
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int main(int argc, char** argv) {
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::testing::InitGoogleTest(&argc, argv);
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return RUN_ALL_TESTS();
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}
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