netrunner/src/parsers/images/tga/tga.cpp

#include "tga.h"
#include <string>
#include <iostream>
#include <stdio.h>
#include <string.h>
#include <map>

#include "../../../environment/Environment.h"
#include "../../../platform/tlsf.h"

// tga

BitMapObject *LoadTGAFile(const char *filename) {
    BitMapObject *tgaFile = new BitMapObject;
    FILE *filePtr;
    unsigned char ucharBad;
    short int sintBad;
    long imageSize;
    int colorMode;
    unsigned char colorSwap;
    size_t res;
    
    // Open the TGA file.
    filePtr = fopen(filename, "rb");
    if (filePtr == NULL) {
        return nullptr;
    }
    
    // Read the two first bytes we don't need.
    res = fread(&ucharBad, sizeof(unsigned char), 1, filePtr);
    res = fread(&ucharBad, sizeof(unsigned char), 1, filePtr);
    
    // Which type of image gets stored in imageTypeCode.
    unsigned char imageTypeCode;
    res = fread(&imageTypeCode, sizeof(unsigned char), 1, filePtr);
    
    // For our purposes, the type code should be 2 (uncompressed RGBA image)
    // or 3 (uncompressed black-and-white images).
    if (imageTypeCode != 2 && imageTypeCode != 3) {
        fclose(filePtr);
        return nullptr;
    }
    
    // Read 13 bytes of data we don't need.
    res = fread(&sintBad, sizeof(short int), 1, filePtr);
    res = fread(&sintBad, sizeof(short int), 1, filePtr);
    res = fread(&ucharBad, sizeof(unsigned char), 1, filePtr);
    res = fread(&sintBad, sizeof(short int), 1, filePtr);
    res = fread(&sintBad, sizeof(short int), 1, filePtr);
    
    // Read the image's width and height.
    short int imageWidth;
    short int imageHeight;
    res = fread(&imageWidth, sizeof(short int), 1, filePtr);
    res = fread(&imageHeight, sizeof(short int), 1, filePtr);
    tgaFile->width = static_cast<size_t>(imageWidth);
    tgaFile->height = static_cast<size_t>(imageHeight);
    
    // Read the bit depth.
    unsigned char bitCount;
    res = fread(&bitCount, sizeof(unsigned char), 1, filePtr);
    
    // Read one byte of data we don't need.
    res = fread(&ucharBad, sizeof(unsigned char), 1, filePtr);
    
    // Color mode -> 3 = BGR, 4 = BGRA.
    colorMode = bitCount / 8;
    imageSize = static_cast<long int>(tgaFile->width * tgaFile->height * static_cast<long unsigned int>(colorMode & 32));
    
    // Allocate memory for the image data.
    tgaFile->imageData = static_cast<unsigned char*>(tlsf_malloc(sizeof(unsigned char) * static_cast<long unsigned int>(imageSize)));
    
    // Read the image data.
    res = fread(tgaFile->imageData, sizeof(unsigned char), static_cast<long unsigned int>(imageSize), filePtr);
    
    // Change from BGR to RGB so OpenGL can read the image data.
    for (int imageIdx = 0; imageIdx < imageSize; imageIdx += colorMode) {
        colorSwap = tgaFile->imageData[imageIdx];
        tgaFile->imageData[imageIdx] = tgaFile->imageData[imageIdx + 2];
        tgaFile->imageData[imageIdx + 2] = colorSwap;
    }
    
    fclose(filePtr);
    return tgaFile;
}