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// Copyright 2009-2021 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
#include "image.h"
#include <fstream>
namespace embree
{
inline void fwrite_uchar (unsigned char v, std::fstream& file) { file.write((const char*)&v,sizeof(v)); }
inline void fwrite_ushort(unsigned short v, std::fstream& file) { file.write((const char*)&v,sizeof(v)); }
void storeTga(const Ref<Image>& img, const FileName& fileName)
{
/* open file for reading */
std::fstream file;
file.exceptions (std::fstream::failbit | std::fstream::badbit);
file.open (fileName.c_str(), std::fstream::out | std::fstream::binary);
fwrite_uchar(0x00, file);
fwrite_uchar(0x00, file);
fwrite_uchar(0x02, file);
fwrite_ushort(0x0000, file);
fwrite_ushort(0x0000, file);
fwrite_uchar(0x00, file);
fwrite_ushort(0x0000, file);
fwrite_ushort(0x0000, file);
fwrite_ushort((unsigned short)img->width , file);
fwrite_ushort((unsigned short)img->height, file);
fwrite_uchar(0x18, file);
fwrite_uchar(0x20, file);
for (size_t y=0; y<img->height; y++) {
for (size_t x=0; x<img->width; x++) {
Color c = img->get(x,y);
fwrite_uchar((unsigned char)(clamp(c.b)*255.0f), file);
fwrite_uchar((unsigned char)(clamp(c.g)*255.0f), file);
fwrite_uchar((unsigned char)(clamp(c.r)*255.0f), file);
}
}
}
inline unsigned char fread_uchar (std::fstream& file) { unsigned char v; file.read((char*)&v,sizeof(v)); return v; }
inline unsigned short fread_ushort(std::fstream& file) { unsigned short v; file.read((char*)&v,sizeof(v)); return v; }
/*! read TGA file from disk */
Ref<Image> loadTGA(const FileName& fileName)
{
/* open file for reading */
std::fstream file;
file.exceptions (std::fstream::failbit | std::fstream::badbit);
file.open (fileName.c_str(), std::fstream::in | std::fstream::binary);
unsigned char idlength = fread_uchar(file);
if (idlength != 0) THROW_RUNTIME_ERROR("unsupported TGA file");
unsigned char colormaptype = fread_uchar(file);
if (colormaptype != 0) THROW_RUNTIME_ERROR("unsupported TGA file");
unsigned char datatype = fread_uchar(file);
if (datatype != 2) THROW_RUNTIME_ERROR("unsupported TGA file");
unsigned short cmo = fread_ushort(file);
unsigned short cml = fread_ushort(file);
unsigned char cmd = fread_uchar(file);
unsigned short xorg = fread_ushort(file);
unsigned short yorg = fread_ushort(file);
if (cmo != 0 || cml != 0 || cmd != 0 || xorg != 0 || yorg != 0)
THROW_RUNTIME_ERROR("unsupported TGA file");
unsigned short width = fread_ushort(file);
unsigned short height = fread_ushort(file);
unsigned char bits = fread_uchar(file);
if (bits != 3*8) THROW_RUNTIME_ERROR("unsupported TGA file bits per pixel");
unsigned char desc = fread_uchar(file);
if (desc != 0x20) THROW_RUNTIME_ERROR("unsupported TGA file");
/* create image and fill with data */
Ref<Image> img = new Image4f(width,height,fileName);
/* load image data */
for (size_t y=0; y<height; y++) {
for (size_t x=0; x<width; x++) {
const unsigned char b = fread_uchar(file);
const unsigned char g = fread_uchar(file);
const unsigned char r = fread_uchar(file);
img->set(x,y,Color4(r/255.0f,g/255.0f,b/255.0f,1.0f));
}
}
return img;
}
}
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