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// Copyright 2024 Google LLC
// SPDX-License-Identifier: BSD-2-Clause
#include <cstdint>
#include "avif/avif.h"
#include "avif/avif_cxx.h"
#include "avif/internal.h"
#include "gtest/gtest.h"
namespace avif {
namespace {
//------------------------------------------------------------------------------
class AvifExpression : public avifSampleTransformExpression {
public:
AvifExpression() : avifSampleTransformExpression{} {}
~AvifExpression() { avifArrayDestroy(this); }
void AddConstant(int32_t constant) {
avifSampleTransformToken& token = AddToken();
token.type = AVIF_SAMPLE_TRANSFORM_CONSTANT;
token.constant = constant;
}
void AddImage(uint8_t inputImageItemIndex) {
avifSampleTransformToken& token = AddToken();
token.type = AVIF_SAMPLE_TRANSFORM_INPUT_IMAGE_ITEM_INDEX;
token.inputImageItemIndex = inputImageItemIndex;
}
void AddOperator(avifSampleTransformTokenType op) {
avifSampleTransformToken& token = AddToken();
token.type = op;
}
int32_t Apply() const {
ImagePtr result(avifImageCreate(/*width=*/1, /*height=*/1, /*depth=*/8,
AVIF_PIXEL_FORMAT_YUV444));
if (result.get() == nullptr) abort();
if (avifImageAllocatePlanes(result.get(), AVIF_PLANES_YUV) !=
AVIF_RESULT_OK) {
abort();
}
if (avifImageApplyExpression(result.get(),
AVIF_SAMPLE_TRANSFORM_BIT_DEPTH_32, this,
/*numInputImageItems=*/0, nullptr,
AVIF_PLANES_YUV) != AVIF_RESULT_OK) {
abort();
}
return result->yuvPlanes[0][0];
}
private:
avifSampleTransformToken& AddToken() {
if (tokens == nullptr &&
!avifArrayCreate(this, sizeof(avifSampleTransformToken), 1)) {
abort();
}
avifSampleTransformToken* token =
reinterpret_cast<avifSampleTransformToken*>(avifArrayPush(this));
if (token == nullptr) abort();
return *token;
}
};
int32_t Eval(int32_t a, int32_t b, avifSampleTransformTokenType op) {
AvifExpression e;
e.AddConstant(a);
e.AddConstant(b);
e.AddOperator(op);
return e.Apply();
}
//------------------------------------------------------------------------------
TEST(SampleTransformTest, NoExpression) {
AvifExpression empty;
ASSERT_EQ(
avifSampleTransformRecipeToExpression(AVIF_SAMPLE_TRANSFORM_NONE, &empty),
AVIF_RESULT_INVALID_ARGUMENT);
EXPECT_TRUE(avifSampleTransformExpressionIsEquivalentTo(&empty, &empty));
}
TEST(SampleTransformTest, NoRecipe) {
AvifExpression empty;
avifSampleTransformRecipe recipe;
ASSERT_EQ(avifSampleTransformExpressionToRecipe(&empty, &recipe),
AVIF_RESULT_OK);
EXPECT_EQ(recipe, AVIF_SAMPLE_TRANSFORM_NONE);
}
TEST(SampleTransformTest, RecipeToExpression) {
for (avifSampleTransformRecipe recipe :
{AVIF_SAMPLE_TRANSFORM_BIT_DEPTH_EXTENSION_8B_8B,
AVIF_SAMPLE_TRANSFORM_BIT_DEPTH_EXTENSION_12B_4B,
AVIF_SAMPLE_TRANSFORM_BIT_DEPTH_EXTENSION_12B_8B_OVERLAP_4B}) {
AvifExpression expression;
ASSERT_EQ(avifSampleTransformRecipeToExpression(recipe, &expression),
AVIF_RESULT_OK);
avifSampleTransformRecipe result;
ASSERT_EQ(avifSampleTransformExpressionToRecipe(&expression, &result),
AVIF_RESULT_OK);
EXPECT_EQ(recipe, result);
EXPECT_FALSE(avifSampleTransformExpressionIsValid(
&expression, /*numInputImageItems=*/1));
EXPECT_TRUE(avifSampleTransformExpressionIsValid(&expression,
/*numInputImageItems=*/2));
EXPECT_TRUE(avifSampleTransformExpressionIsValid(&expression,
/*numInputImageItems=*/3));
EXPECT_TRUE(
avifSampleTransformExpressionIsEquivalentTo(&expression, &expression));
}
}
TEST(SampleTransformTest, NotEquivalent) {
AvifExpression a;
ASSERT_EQ(avifSampleTransformRecipeToExpression(
AVIF_SAMPLE_TRANSFORM_BIT_DEPTH_EXTENSION_8B_8B, &a),
AVIF_RESULT_OK);
AvifExpression b;
ASSERT_EQ(avifSampleTransformRecipeToExpression(
AVIF_SAMPLE_TRANSFORM_BIT_DEPTH_EXTENSION_12B_4B, &b),
AVIF_RESULT_OK);
EXPECT_FALSE(avifSampleTransformExpressionIsEquivalentTo(&a, &b));
}
TEST(SampleTransformTest, MaxStackSize) {
AvifExpression e;
for (int i = 0; i < 128; ++i) e.AddConstant(42);
for (int i = 0; i < 127; ++i) e.AddOperator(AVIF_SAMPLE_TRANSFORM_SUM);
EXPECT_EQ(e.Apply(), 255);
}
TEST(SampleTransformTest, Pow) {
// Results are clamped to uint8_t.
EXPECT_EQ(Eval(-2, INT32_MIN, AVIF_SAMPLE_TRANSFORM_POW), 0);
EXPECT_EQ(Eval(-2, -3, AVIF_SAMPLE_TRANSFORM_POW), 0);
EXPECT_EQ(Eval(-2, -2, AVIF_SAMPLE_TRANSFORM_POW), 0);
EXPECT_EQ(Eval(-2, -1, AVIF_SAMPLE_TRANSFORM_POW), 0);
EXPECT_EQ(Eval(-2, 0, AVIF_SAMPLE_TRANSFORM_POW), 1);
EXPECT_EQ(Eval(-2, 1, AVIF_SAMPLE_TRANSFORM_POW), 0); // -2 clamped
EXPECT_EQ(Eval(-2, 2, AVIF_SAMPLE_TRANSFORM_POW), 4);
EXPECT_EQ(Eval(-2, 3, AVIF_SAMPLE_TRANSFORM_POW), 0); // -8 clamped
EXPECT_EQ(Eval(-2, INT32_MAX - 1, AVIF_SAMPLE_TRANSFORM_POW),
255); // INT32_MAX clamped
EXPECT_EQ(Eval(-2, INT32_MAX, AVIF_SAMPLE_TRANSFORM_POW),
0); // INT32_MIN clamped
EXPECT_EQ(Eval(-1, INT32_MIN, AVIF_SAMPLE_TRANSFORM_POW), 1);
EXPECT_EQ(Eval(-1, -3, AVIF_SAMPLE_TRANSFORM_POW), 0); // -1 clamped
EXPECT_EQ(Eval(-1, -2, AVIF_SAMPLE_TRANSFORM_POW), 1);
EXPECT_EQ(Eval(-1, -1, AVIF_SAMPLE_TRANSFORM_POW), 0); // -1 clamped
EXPECT_EQ(Eval(-1, 0, AVIF_SAMPLE_TRANSFORM_POW), 1);
EXPECT_EQ(Eval(-1, 1, AVIF_SAMPLE_TRANSFORM_POW), 0); // -1 clamped
EXPECT_EQ(Eval(-1, 2, AVIF_SAMPLE_TRANSFORM_POW), 1);
EXPECT_EQ(Eval(-1, 3, AVIF_SAMPLE_TRANSFORM_POW), 0); // -1 clamped
EXPECT_EQ(Eval(-1, INT32_MAX - 1, AVIF_SAMPLE_TRANSFORM_POW), 1);
EXPECT_EQ(Eval(-1, INT32_MAX, AVIF_SAMPLE_TRANSFORM_POW), 0); // -1 clamped
for (int32_t v : {0, 1}) {
EXPECT_EQ(Eval(v, INT32_MIN, AVIF_SAMPLE_TRANSFORM_POW), v);
EXPECT_EQ(Eval(v, -2, AVIF_SAMPLE_TRANSFORM_POW), v);
EXPECT_EQ(Eval(v, -1, AVIF_SAMPLE_TRANSFORM_POW), v);
EXPECT_EQ(Eval(v, 0, AVIF_SAMPLE_TRANSFORM_POW), v);
EXPECT_EQ(Eval(v, 1, AVIF_SAMPLE_TRANSFORM_POW), v);
EXPECT_EQ(Eval(v, 2, AVIF_SAMPLE_TRANSFORM_POW), v);
EXPECT_EQ(Eval(v, INT32_MAX, AVIF_SAMPLE_TRANSFORM_POW), v);
}
EXPECT_EQ(Eval(-(1 << 16), 3, AVIF_SAMPLE_TRANSFORM_POW),
0); // INT32_MIN clamped
EXPECT_EQ(Eval((1 << 16), 3, AVIF_SAMPLE_TRANSFORM_POW),
255); // INT32_MAX clamped
}
//------------------------------------------------------------------------------
struct Op {
Op(int32_t l, avifSampleTransformTokenType o, int32_t r, uint32_t e)
: left(l), right(r), op(o), expected_result(e), single_operand(false) {}
Op(avifSampleTransformTokenType o, int32_t l, uint32_t e)
: left(l), right(0), op(o), expected_result(e), single_operand(true) {}
int32_t left;
int32_t right;
avifSampleTransformTokenType op;
uint32_t expected_result;
bool single_operand;
};
class SampleTransformOperationTest : public testing::TestWithParam<Op> {};
TEST_P(SampleTransformOperationTest, Apply) {
AvifExpression expression;
// Postfix notation.
expression.AddConstant(GetParam().left);
if (!GetParam().single_operand) expression.AddConstant(GetParam().right);
expression.AddOperator(GetParam().op);
EXPECT_EQ(expression.Apply(), GetParam().expected_result);
}
INSTANTIATE_TEST_SUITE_P(
Operations, SampleTransformOperationTest,
testing::Values(Op(AVIF_SAMPLE_TRANSFORM_NEGATION, 1, 0),
Op(AVIF_SAMPLE_TRANSFORM_NEGATION, -1, 1),
Op(AVIF_SAMPLE_TRANSFORM_NEGATION, 0, 0),
Op(AVIF_SAMPLE_TRANSFORM_NEGATION, -256, 255),
Op(AVIF_SAMPLE_TRANSFORM_ABSOLUTE, 1, 1),
Op(AVIF_SAMPLE_TRANSFORM_ABSOLUTE, -1, 1),
Op(AVIF_SAMPLE_TRANSFORM_ABSOLUTE, 256, 255),
Op(AVIF_SAMPLE_TRANSFORM_ABSOLUTE, -256, 255),
Op(1, AVIF_SAMPLE_TRANSFORM_SUM, 1, 2),
Op(255, AVIF_SAMPLE_TRANSFORM_SUM, 255, 255),
Op(1, AVIF_SAMPLE_TRANSFORM_DIFFERENCE, 1, 0),
Op(255, AVIF_SAMPLE_TRANSFORM_DIFFERENCE, 255, 0),
Op(255, AVIF_SAMPLE_TRANSFORM_DIFFERENCE, 0, 255),
Op(0, AVIF_SAMPLE_TRANSFORM_DIFFERENCE, 255, 0),
Op(1, AVIF_SAMPLE_TRANSFORM_DIFFERENCE, -1, 2),
Op(-1, AVIF_SAMPLE_TRANSFORM_DIFFERENCE, 1, 0),
Op(1, AVIF_SAMPLE_TRANSFORM_PRODUCT, 1, 1),
Op(2, AVIF_SAMPLE_TRANSFORM_PRODUCT, 3, 6),
Op(1, AVIF_SAMPLE_TRANSFORM_QUOTIENT, 1, 1),
Op(2, AVIF_SAMPLE_TRANSFORM_QUOTIENT, 3, 0),
Op(1, AVIF_SAMPLE_TRANSFORM_AND, 1, 1),
Op(1, AVIF_SAMPLE_TRANSFORM_AND, 2, 0),
Op(7, AVIF_SAMPLE_TRANSFORM_AND, 15, 7),
Op(1, AVIF_SAMPLE_TRANSFORM_OR, 1, 1),
Op(1, AVIF_SAMPLE_TRANSFORM_OR, 2, 3),
Op(1, AVIF_SAMPLE_TRANSFORM_XOR, 3, 2),
Op(AVIF_SAMPLE_TRANSFORM_NOT, 254, 0),
Op(AVIF_SAMPLE_TRANSFORM_NOT, -1, 0),
Op(AVIF_SAMPLE_TRANSFORM_BSR, 0, 0),
Op(AVIF_SAMPLE_TRANSFORM_BSR, -1, 0),
Op(AVIF_SAMPLE_TRANSFORM_BSR, 61, 5),
Op(AVIF_SAMPLE_TRANSFORM_BSR,
std::numeric_limits<int32_t>::max(), 30),
Op(2, AVIF_SAMPLE_TRANSFORM_POW, 4, 16),
Op(4, AVIF_SAMPLE_TRANSFORM_POW, 2, 16),
Op(123, AVIF_SAMPLE_TRANSFORM_POW, 123, 255),
Op(123, AVIF_SAMPLE_TRANSFORM_MIN, 124, 123),
Op(123, AVIF_SAMPLE_TRANSFORM_MAX, 124, 124)));
//------------------------------------------------------------------------------
} // namespace
} // namespace avif
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