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image_io.cpp
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image_io.cpp
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/**
* Copyright (C) 2015 by Liangliang Nan (liangliang.nan@gmail.com)
* https://3d.bk.tudelft.nl/liangliang/
*
* This file is part of Easy3D. If it is useful in your research/work,
* I would be grateful if you show your appreciation by citing it:
* ------------------------------------------------------------------
* Liangliang Nan.
* Easy3D: a lightweight, easy-to-use, and efficient C++
* library for processing and rendering 3D data. 2018.
* ------------------------------------------------------------------
* Easy3D is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License Version 3
* as published by the Free Software Foundation.
*
* Easy3D is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <easy3d/fileio/image_io.h>
#include <iostream>
#include <easy3d/util/file_system.h>
#include <easy3d/util/logging.h>
#define STB_IMAGE_IMPLEMENTATION
#include <3rd_party/stb/stb_image.h>
#define STB_IMAGE_WRITE_IMPLEMENTATION
#include <3rd_party/stb/stb_image_write.h>
namespace easy3d {
bool ImageIO::load(
const std::string& file_name,
std::vector<unsigned char>& data,
int& width,
int& height,
int& channels,
int requested_channels,
bool flip_vertically)
{
data.clear();
// flag is non-zero to flip data vertically (so the first pixel in the output array is the bottom left)
stbi_set_flip_vertically_on_load(flip_vertically);
unsigned char* pixels = stbi_load(file_name.c_str(), &width, &height, &channels, requested_channels);
if (pixels) {
data.assign(pixels, pixels + height * width * channels);
stbi_image_free(pixels);
return true;
}
else {
LOG(ERROR) << "failed load image file: " << file_name << ". " << stbi_failure_reason();
return false;
}
}
bool ImageIO::save(
const std::string& file_name,
const std::vector<unsigned char>& data,
int width,
int height,
int channels,
bool flip_vertically)
{
if (data.empty()) {
LOG(ERROR) << "image data is empty";
return false;
}
// flag is non-zero to flip data vertically
stbi_flip_vertically_on_write(flip_vertically);
std::string final_name = file_name;
const std::string& ext = file_system::extension(file_name, true);
if (ext == "png" || ext.empty()) {
if (ext.empty()) {
LOG(ERROR) << "No extension specified. Default to png";
final_name = final_name + ".png";
}
// PNG allows you to set the deflate compression level by setting the global
// variable 'stbi_write_png_compression_level' (it defaults to 8).
stbi_write_png_compression_level = 8; //
return ::stbi_write_png(final_name.c_str(), width, height, channels, data.data(), width * channels);
}
else if (ext == "jpg") {
// quality is between 1 and 100. Higher quality looks better but results in a bigger image.
return ::stbi_write_jpg(final_name.c_str(), width, height, channels, data.data(), 100);
}
else if (ext == "bmp")
return ::stbi_write_bmp(final_name.c_str(), width, height, channels, data.data());
else if (ext == "tga")
return ::stbi_write_tga(final_name.c_str(), width, height, channels, data.data());
else {
LOG(ERROR) << "unsupported file format: " << ext;
return false;
}
}
namespace io {
// NOTE: assumes that each pixel has 3 chanels in RGB order
bool save_ppm(
const std::string& file_name,
const std::vector<unsigned char>& bits,
int width,
int height)
{
FILE* fptr = fopen(file_name.c_str(), "wb");
if (!fptr) {
LOG(ERROR) << "could not open file: " << file_name;
return false;
}
char tmp[256];
sprintf(tmp, "P6 %i %i %i\n", width, height, 255);
fwrite(tmp, strlen(tmp), 1, fptr);
fwrite(bits.data(), 1, bits.size(), fptr);
fclose(fptr);
return true;
}
// NOTE: assumes that each pixel has 4 chanels in BGRA order
bool save_bmp(
const std::string& file_name,
const std::vector<unsigned char>& bits,
int width,
int height)
{
#pragma pack(push, 1)
struct {
unsigned short bfType;
unsigned int bfSize;
unsigned int bfReserved;
unsigned int bfOffBits;
unsigned int biSize;
signed int biWidth;
signed int biHeight;
unsigned short biPlanes;
unsigned short biBitCount;
unsigned int biCompression;
unsigned int biSizeImage;
signed int biXPelsPerMeter;
signed int biYPelsPerMeter;
unsigned int biClrUsed;
unsigned int biClrImportant;
} bmpinfo;
#pragma pack(pop)
bmpinfo.bfType = 19778;
bmpinfo.bfSize = sizeof(bmpinfo) + width * height * 4 * sizeof(unsigned char);
bmpinfo.bfReserved = 0;
bmpinfo.bfOffBits = 54;
bmpinfo.biSize = 40;
bmpinfo.biWidth = width;
bmpinfo.biHeight = height;
bmpinfo.biPlanes = 1;
bmpinfo.biBitCount = 32;
bmpinfo.biCompression = 0;
bmpinfo.biSizeImage = 0;
bmpinfo.biXPelsPerMeter = 0;
bmpinfo.biYPelsPerMeter = 0;
bmpinfo.biClrUsed = 0;
bmpinfo.biClrImportant = 0;
FILE* bmpfile = fopen(file_name.c_str(), "wb");
fwrite(&bmpinfo, sizeof(bmpinfo), 1, bmpfile);
fwrite(bits.data(), sizeof(char), width * height * 4 * sizeof(unsigned char), bmpfile);
fclose(bmpfile);
return true;
}
// NOTE: assumes that each pixel has 4 chanels in BGRA order
bool save_tga(
const std::string& file_name,
const std::vector<unsigned char>& bits,
int width,
int height)
{
FILE* fptr = fopen(file_name.c_str(), "wb");
if (!fptr) {
LOG(ERROR) << "could not open file: " << file_name;
return false;
}
fputc(0, fptr); /* ID */
fputc(0, fptr); /* Color map */
fputc(2, fptr); /* Image type */
fputc(0, fptr); fputc(0, fptr); /* First entry of color map (unused) */
fputc(0, fptr); fputc(0, fptr); /* Length of color map (unused) */
fputc(0, fptr); /* Color map entry size (unused) */
fputc(0, fptr); fputc(0, fptr); /* X offset */
fputc(0, fptr); fputc(0, fptr); /* Y offset */
fputc(width % 256, fptr); /* Width */
fputc(width / 256, fptr); /* continued */
fputc(height % 256, fptr); /* Height */
fputc(height / 256, fptr); /* continued */
fputc(32, fptr); /* Bits per pixel */
fputc(0x20, fptr); /* Scan from top left */
fwrite(bits.data(), bits.size(), 1, fptr);
fclose(fptr);
return true;
}
}
} // namespace easy3d