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//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of NVIDIA CORPORATION nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Copyright (c) 2018 NVIDIA Corporation. All rights reserved.
#include "stdafx.h"
#include "CPPJPEGWrapper.h"
CPPJPEGWrapper::CPPJPEGWrapper() {
data = 0;
x = 0;
y = 0;
}
CPPJPEGWrapper::~CPPJPEGWrapper() {
Unload();
}
void CPPJPEGWrapper::Unload() {
if (data) {
delete [] data;
data = 0;
}
}
unsigned char* CPPJPEGWrapper::GetData() const {
return data;
}
unsigned CPPJPEGWrapper::GetWidth() {
return x;
}
unsigned CPPJPEGWrapper::GetHeight() {
return y;
}
unsigned CPPJPEGWrapper::GetBPP() {
return bpp;
}
unsigned CPPJPEGWrapper::GetChannels() {
return channels;
}
bool CPPJPEGWrapper::LoadJPEG(const char* FileName, bool Fast)
{
Unload();
FILE* file = fopen(FileName, "rb"); //open the file
if (!file) return false;
struct jpeg_decompress_struct info; //the jpeg decompress info
struct jpeg_error_mgr err; //the error handler
info.err = jpeg_std_error(&err); //tell the jpeg decompression handler to send the errors to err
jpeg_create_decompress(&info); //sets info to all the default stuff
//if the jpeg file didnt load exit
if(!file)
{
//fprintf(stderr, "Error reading JPEG file %s!!!", FileName);
//LoadBlackWhiteBorder();
return false;
}
jpeg_stdio_src(&info, file); //tell the jpeg lib the file we'er reading
jpeg_read_header(&info, TRUE); //tell it to start reading it
//if it wants to be read fast or not
if(Fast)
{
info.do_fancy_upsampling = FALSE;
}
jpeg_start_decompress(&info); //decompress the file
//set the x and y
x = info.output_width;
y = info.output_height;
channels = info.num_components;
bpp = channels * 8;
size = x * y * 3;
//read turn the uncompressed data into something ogl can read
data = new unsigned char[size]; //setup data for the data its going to be handling
unsigned char* p1 = data;
unsigned char** p2 = &p1;
int numlines = 0;
while(info.output_scanline < info.output_height)
{
numlines = jpeg_read_scanlines(&info, p2, 1);
*p2 += numlines * 3 * info.output_width;
}
jpeg_finish_decompress(&info); //finish decompressing this file
fclose(file); //close the file
return true;
}
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