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