sandboxed-api/oss-internship-2020/guetzli/guetzli_entry_points.cc

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// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "guetzli_entry_points.h" // NOLINT(build/include)
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#include <sys/stat.h>
#include <algorithm>
#include <cstdio>
#include <iostream>
#include <string>
#include <vector>
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#include "guetzli/jpeg_data_reader.h"
#include "guetzli/quality.h"
#include "png.h" // NOLINT(build/include)
#include "absl/status/statusor.h"
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#include "sandboxed_api/sandbox2/util/fileops.h"
namespace {
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constexpr int kBytesPerPixel = 350;
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constexpr int kLowestMemusageMB = 100;
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struct GuetzliInitData {
std::string in_data;
guetzli::Params params;
guetzli::ProcessStats stats;
};
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struct ImageData {
int xsize;
int ysize;
std::vector<uint8_t> rgb;
};
sapi::LenValStruct CreateLenValFromData(const void* data, size_t size) {
void* new_data = malloc(size);
memcpy(new_data, data, size);
return {size, new_data};
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}
absl::StatusOr<std::string> ReadFromFd(int fd) {
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struct stat file_data;
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int status = fstat(fd, &file_data);
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if (status < 0) {
return absl::FailedPreconditionError("Error reading input from fd");
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}
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std::string result;
result.resize(file_data.st_size);
status = read(fd, result.data(), result.size());
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if (status < 0) {
return absl::FailedPreconditionError("Error reading input from fd");
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}
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return result;
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}
absl::StatusOr<GuetzliInitData> PrepareDataForProcessing(
const ProcessingParams& processing_params) {
absl::StatusOr<std::string> input = ReadFromFd(processing_params.remote_fd);
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if (!input.ok()) {
return input.status();
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}
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guetzli::Params guetzli_params;
guetzli_params.butteraugli_target = static_cast<float>(
guetzli::ButteraugliScoreForQuality(processing_params.quality));
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guetzli::ProcessStats stats;
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if (processing_params.verbose) {
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stats.debug_output_file = stderr;
}
return GuetzliInitData{std::move(input.value()), guetzli_params, stats};
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}
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inline uint8_t BlendOnBlack(const uint8_t val, const uint8_t alpha) {
return (static_cast<int>(val) * static_cast<int>(alpha) + 128) / 255;
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}
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// Modified version of ReadPNG from original guetzli.cc
absl::StatusOr<ImageData> ReadPNG(const std::string& data) {
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std::vector<uint8_t> rgb;
int xsize, ysize;
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png_structp png_ptr =
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png_create_read_struct(PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr);
if (!png_ptr) {
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return absl::FailedPreconditionError(
"Error reading PNG data from input file");
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}
png_infop info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
png_destroy_read_struct(&png_ptr, nullptr, nullptr);
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return absl::FailedPreconditionError(
"Error reading PNG data from input file");
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}
if (setjmp(png_jmpbuf(png_ptr)) != 0) {
// Ok we are here because of the setjmp.
png_destroy_read_struct(&png_ptr, &info_ptr, nullptr);
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return absl::FailedPreconditionError(
"Error reading PNG data from input file");
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}
std::istringstream memstream(data, std::ios::in | std::ios::binary);
png_set_read_fn(
png_ptr, static_cast<void*>(&memstream),
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[](png_structp png_ptr, png_bytep outBytes, png_size_t byteCountToRead) {
std::istringstream& memstream =
*static_cast<std::istringstream*>(png_get_io_ptr(png_ptr));
memstream.read(reinterpret_cast<char*>(outBytes), byteCountToRead);
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if (memstream.eof()) png_error(png_ptr, "unexpected end of data");
if (memstream.fail()) png_error(png_ptr, "read from memory error");
});
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// The png_transforms flags are as follows:
// packing == convert 1,2,4 bit images,
// strip == 16 -> 8 bits / channel,
// shift == use sBIT dynamics, and
// expand == palettes -> rgb, grayscale -> 8 bit images, tRNS -> alpha.
const unsigned int png_transforms =
PNG_TRANSFORM_PACKING | PNG_TRANSFORM_EXPAND | PNG_TRANSFORM_STRIP_16;
png_read_png(png_ptr, info_ptr, png_transforms, nullptr);
png_bytep* row_pointers = png_get_rows(png_ptr, info_ptr);
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xsize = png_get_image_width(png_ptr, info_ptr);
ysize = png_get_image_height(png_ptr, info_ptr);
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rgb.resize(3 * xsize * ysize);
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const int components = png_get_channels(png_ptr, info_ptr);
switch (components) {
case 1: {
// GRAYSCALE
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for (int y = 0; y < ysize; ++y) {
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const uint8_t* row_in = row_pointers[y];
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uint8_t* row_out = &rgb[3 * y * xsize];
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for (int x = 0; x < xsize; ++x) {
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const uint8_t gray = row_in[x];
row_out[3 * x + 0] = gray;
row_out[3 * x + 1] = gray;
row_out[3 * x + 2] = gray;
}
}
break;
}
case 2: {
// GRAYSCALE + ALPHA
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for (int y = 0; y < ysize; ++y) {
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const uint8_t* row_in = row_pointers[y];
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uint8_t* row_out = &rgb[3 * y * xsize];
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for (int x = 0; x < xsize; ++x) {
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const uint8_t gray = BlendOnBlack(row_in[2 * x], row_in[2 * x + 1]);
row_out[3 * x + 0] = gray;
row_out[3 * x + 1] = gray;
row_out[3 * x + 2] = gray;
}
}
break;
}
case 3: {
// RGB
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for (int y = 0; y < ysize; ++y) {
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const uint8_t* row_in = row_pointers[y];
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uint8_t* row_out = &rgb[3 * y * xsize];
memcpy(row_out, row_in, 3 * xsize);
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}
break;
}
case 4: {
// RGBA
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for (int y = 0; y < ysize; ++y) {
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const uint8_t* row_in = row_pointers[y];
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uint8_t* row_out = &rgb[3 * y * xsize];
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for (int x = 0; x < xsize; ++x) {
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const uint8_t alpha = row_in[4 * x + 3];
row_out[3 * x + 0] = BlendOnBlack(row_in[4 * x + 0], alpha);
row_out[3 * x + 1] = BlendOnBlack(row_in[4 * x + 1], alpha);
row_out[3 * x + 2] = BlendOnBlack(row_in[4 * x + 2], alpha);
}
}
break;
}
default:
png_destroy_read_struct(&png_ptr, &info_ptr, nullptr);
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return absl::FailedPreconditionError(
"Error reading PNG data from input file");
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}
png_destroy_read_struct(&png_ptr, &info_ptr, nullptr);
return ImageData{xsize, ysize, std::move(rgb)};
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}
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bool CheckMemoryLimitExceeded(int memlimit_mb, int xsize, int ysize) {
double pixels = static_cast<double>(xsize) * ysize;
return memlimit_mb != -1 &&
(pixels * kBytesPerPixel / (1 << 20) > memlimit_mb ||
memlimit_mb < kLowestMemusageMB);
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}
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} // namespace
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extern "C" bool ProcessJpeg(const ProcessingParams* processing_params,
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sapi::LenValStruct* output) {
auto processing_data = PrepareDataForProcessing(*processing_params);
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if (!processing_data.ok()) {
std::cerr << processing_data.status().ToString() << std::endl;
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return false;
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}
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guetzli::JPEGData jpg_header;
if (!guetzli::ReadJpeg(processing_data->in_data, guetzli::JPEG_READ_HEADER,
&jpg_header)) {
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std::cerr << "Error reading JPG data from input file" << std::endl;
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return false;
}
if (CheckMemoryLimitExceeded(processing_params->memlimit_mb, jpg_header.width,
jpg_header.height)) {
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std::cerr << "Memory limit would be exceeded" << std::endl;
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return false;
}
std::string out_data;
if (!guetzli::Process(processing_data->params, &processing_data->stats,
processing_data->in_data, &out_data)) {
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std::cerr << "Guezli processing failed" << std::endl;
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return false;
}
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*output = CreateLenValFromData(out_data.data(), out_data.size());
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return true;
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}
extern "C" bool ProcessRgb(const ProcessingParams* processing_params,
sapi::LenValStruct* output) {
auto processing_data = PrepareDataForProcessing(*processing_params);
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if (!processing_data.ok()) {
std::cerr << processing_data.status().ToString() << std::endl;
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return false;
}
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auto png_data = ReadPNG(processing_data->in_data);
if (!png_data.ok()) {
std::cerr << "Error reading PNG data from input file" << std::endl;
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return false;
}
if (CheckMemoryLimitExceeded(processing_params->memlimit_mb, png_data->xsize,
png_data->ysize)) {
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std::cerr << "Memory limit would be exceeded" << std::endl;
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return false;
}
std::string out_data;
if (!guetzli::Process(processing_data->params, &processing_data->stats,
png_data->rgb, png_data->xsize, png_data->ysize,
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&out_data)) {
std::cerr << "Guetzli processing failed" << std::endl;
return false;
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}
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*output = CreateLenValFromData(out_data.data(), out_data.size());
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return true;
}
extern "C" bool WriteDataToFd(int fd, sapi::LenValStruct* data) {
return sandbox2::file_util::fileops::WriteToFD(
fd, static_cast<const char*>(data->data), data->size);
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}