irrlicht/source/Irrlicht/CImageLoaderJPG.cpp
Desour f5c6d3e945 Reformat the code, using:
find -type f |  # list all regular files
  grep -E '\.(h|cpp|mm)$' |  # filter for source files
  grep -v '/mt_' |  # filter out generated files
  grep -v '/vendor/' | # and vendored GL
  grep -v '/test/image_loader_test.cpp' |  # and this file (has giant literals arrays)
  xargs -n 1 -P $(nproc) clang-format -i  # reformat everything

Co-authored-by: numzero <numzer0@yandex.ru>
2024-03-21 22:08:26 +01:00

264 lines
6.8 KiB
C++

// Copyright (C) 2002-2012 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h
#include "CImageLoaderJPG.h"
#include "IReadFile.h"
#include "CImage.h"
#include "os.h"
#include "irrString.h"
namespace irr
{
namespace video
{
//! constructor
CImageLoaderJPG::CImageLoaderJPG()
{
#ifdef _DEBUG
setDebugName("CImageLoaderJPG");
#endif
}
//! destructor
CImageLoaderJPG::~CImageLoaderJPG()
{
}
//! returns true if the file maybe is able to be loaded by this class
//! based on the file extension (e.g. ".tga")
bool CImageLoaderJPG::isALoadableFileExtension(const io::path &filename) const
{
return core::hasFileExtension(filename, "jpg", "jpeg");
}
// struct for handling jpeg errors
struct irr_jpeg_error_mgr
{
// public jpeg error fields
struct jpeg_error_mgr pub;
// for longjmp, to return to caller on a fatal error
jmp_buf setjmp_buffer;
// for having access to the filename when printing the error messages
core::stringc *filename;
};
void CImageLoaderJPG::init_source(j_decompress_ptr cinfo)
{
// DO NOTHING
}
boolean CImageLoaderJPG::fill_input_buffer(j_decompress_ptr cinfo)
{
// DO NOTHING
return TRUE;
}
void CImageLoaderJPG::skip_input_data(j_decompress_ptr cinfo, long count)
{
jpeg_source_mgr *src = cinfo->src;
if (count > 0) {
src->bytes_in_buffer -= count;
src->next_input_byte += count;
}
}
void CImageLoaderJPG::term_source(j_decompress_ptr cinfo)
{
// DO NOTHING
}
void CImageLoaderJPG::error_exit(j_common_ptr cinfo)
{
// unfortunately we need to use a goto rather than throwing an exception
// as gcc crashes under linux crashes when using throw from within
// extern c code
// Always display the message
(*cinfo->err->output_message)(cinfo);
// cinfo->err really points to a irr_error_mgr struct
irr_jpeg_error_mgr *myerr = (irr_jpeg_error_mgr *)cinfo->err;
longjmp(myerr->setjmp_buffer, 1);
}
void CImageLoaderJPG::output_message(j_common_ptr cinfo)
{
// display the error message.
c8 temp1[JMSG_LENGTH_MAX];
(*cinfo->err->format_message)(cinfo, temp1);
core::stringc errMsg("JPEG FATAL ERROR in ");
irr_jpeg_error_mgr *myerr = (irr_jpeg_error_mgr *)cinfo->err;
errMsg += *myerr->filename;
os::Printer::log(errMsg.c_str(), temp1, ELL_ERROR);
}
//! returns true if the file maybe is able to be loaded by this class
bool CImageLoaderJPG::isALoadableFileFormat(io::IReadFile *file) const
{
if (!(file && file->seek(0)))
return false;
unsigned char header[3];
size_t headerLen = file->read(header, sizeof(header));
return headerLen >= 3 && !memcmp(header, "\xFF\xD8\xFF", 3);
}
//! creates a surface from the file
IImage *CImageLoaderJPG::loadImage(io::IReadFile *file) const
{
if (!file)
return 0;
core::stringc filename = file->getFileName();
u8 **rowPtr = 0;
u8 *input = new u8[file->getSize()];
file->read(input, file->getSize());
// allocate and initialize JPEG decompression object
struct jpeg_decompress_struct cinfo;
struct irr_jpeg_error_mgr jerr;
// We have to set up the error handler first, in case the initialization
// step fails. (Unlikely, but it could happen if you are out of memory.)
// This routine fills in the contents of struct jerr, and returns jerr's
// address which we place into the link field in cinfo.
cinfo.err = jpeg_std_error(&jerr.pub);
cinfo.err->error_exit = error_exit;
cinfo.err->output_message = output_message;
jerr.filename = &filename;
// compatibility fudge:
// we need to use setjmp/longjmp for error handling as gcc-linux
// crashes when throwing within external c code
if (setjmp(jerr.setjmp_buffer)) {
// If we get here, the JPEG code has signaled an error.
// We need to clean up the JPEG object and return.
jpeg_destroy_decompress(&cinfo);
delete[] input;
delete[] rowPtr;
// return null pointer
return 0;
}
// Now we can initialize the JPEG decompression object.
jpeg_create_decompress(&cinfo);
// specify data source
jpeg_source_mgr jsrc;
// Set up data pointer
jsrc.bytes_in_buffer = file->getSize();
jsrc.next_input_byte = (JOCTET *)input;
cinfo.src = &jsrc;
jsrc.init_source = init_source;
jsrc.fill_input_buffer = fill_input_buffer;
jsrc.skip_input_data = skip_input_data;
jsrc.resync_to_restart = jpeg_resync_to_restart;
jsrc.term_source = term_source;
// Decodes JPG input from whatever source
// Does everything AFTER jpeg_create_decompress
// and BEFORE jpeg_destroy_decompress
// Caller is responsible for arranging these + setting up cinfo
// read file parameters with jpeg_read_header()
jpeg_read_header(&cinfo, TRUE);
bool useCMYK = false;
if (cinfo.jpeg_color_space == JCS_CMYK) {
cinfo.out_color_space = JCS_CMYK;
cinfo.out_color_components = 4;
useCMYK = true;
} else {
cinfo.out_color_space = JCS_RGB;
cinfo.out_color_components = 3;
}
cinfo.output_gamma = 2.2;
cinfo.do_fancy_upsampling = FALSE;
// reject unreasonable sizes
if (!checkImageDimensions(cinfo.image_width, cinfo.image_height))
longjmp(jerr.setjmp_buffer, 1);
// Start decompressor
jpeg_start_decompress(&cinfo);
// Get image data
u32 rowspan = cinfo.image_width * cinfo.out_color_components;
u32 width = cinfo.image_width;
u32 height = cinfo.image_height;
// Allocate memory for buffer
u8 *output = new u8[rowspan * height];
// Here we use the library's state variable cinfo.output_scanline as the
// loop counter, so that we don't have to keep track ourselves.
// Create array of row pointers for lib
rowPtr = new u8 *[height];
for (u32 i = 0; i < height; i++)
rowPtr[i] = &output[i * rowspan];
u32 rowsRead = 0;
while (cinfo.output_scanline < cinfo.output_height)
rowsRead += jpeg_read_scanlines(&cinfo, &rowPtr[rowsRead], cinfo.output_height - rowsRead);
delete[] rowPtr;
// Finish decompression
jpeg_finish_decompress(&cinfo);
// Release JPEG decompression object
// This is an important step since it will release a good deal of memory.
jpeg_destroy_decompress(&cinfo);
// convert image
IImage *image = 0;
if (useCMYK) {
image = new CImage(ECF_R8G8B8,
core::dimension2d<u32>(width, height));
const u32 size = 3 * width * height;
u8 *data = (u8 *)image->getData();
if (data) {
for (u32 i = 0, j = 0; i < size; i += 3, j += 4) {
// Also works without K, but has more contrast with K multiplied in
// data[i+0] = output[j+2];
// data[i+1] = output[j+1];
// data[i+2] = output[j+0];
data[i + 0] = (char)(output[j + 2] * (output[j + 3] / 255.f));
data[i + 1] = (char)(output[j + 1] * (output[j + 3] / 255.f));
data[i + 2] = (char)(output[j + 0] * (output[j + 3] / 255.f));
}
}
delete[] output;
} else
image = new CImage(ECF_R8G8B8,
core::dimension2d<u32>(width, height), output);
delete[] input;
return image;
}
//! creates a loader which is able to load jpeg images
IImageLoader *createImageLoaderJPG()
{
return new CImageLoaderJPG();
}
} // end namespace video
} // end namespace irr