131 lines
3.7 KiB
C++
131 lines
3.7 KiB
C++
#include "Texture.h"
|
|
#include <fstream>
|
|
|
|
TextureTGA::TextureTGA(const char * filePath)
|
|
{
|
|
// open the file
|
|
std::fstream fsPicture(filePath, std::ios::in | std::ios::binary);
|
|
|
|
if (!fsPicture.is_open())
|
|
throw std::invalid_argument(std::string("file not found: ") += filePath);
|
|
|
|
// read in the header
|
|
std::uint8_t ui8x18Header[19] = { 0 };
|
|
fsPicture.read(reinterpret_cast<char*>(&ui8x18Header), sizeof(ui8x18Header)-1);
|
|
|
|
// extract all information from header
|
|
ui32IDLength = ui8x18Header[0];
|
|
bColorTabel = ui8x18Header[1] == 1;
|
|
ui32PicType = ui8x18Header[2];
|
|
ui32PaletteBegin = ui8x18Header[4] * 0x100 + ui8x18Header[3];
|
|
ui32PaletteLength = ui8x18Header[6] * 0x100 + ui8x18Header[5];
|
|
ui32PaletteBpP = ui8x18Header[7];
|
|
ui32Width = ui8x18Header[13] * 0x100 + ui8x18Header[12];
|
|
ui32Height = ui8x18Header[15] * 0x100 + ui8x18Header[14];
|
|
ui32BpP = ui8x18Header[16];
|
|
ui32Attribut = ui8x18Header[17];
|
|
|
|
// calculate some more information
|
|
ui32Size = ui32Width * ui32Height * ui32BpP/8;
|
|
bCompressed = ui32PicType == 9 || ui32PicType == 10;
|
|
vui8Pixels.resize(ui32Size);
|
|
|
|
/* consol output of the header
|
|
std::cout << "Header\n"
|
|
<< "ID länge: " << ui32IDLength << std::endl
|
|
<< "Farbtabelle: " << (int)bColorTabel << std::endl
|
|
<< "Bildtype: " << ui32PicType << std::endl
|
|
<< "Palletenbegin: " << ui32PaletteBegin << std::endl
|
|
<< "Palletenlängen: " << ui32PaletteLength << std::endl
|
|
<< "Bits pro Palleteneintrag: " << ui32PaletteBpP << std::endl
|
|
<< "Breite: " << ui32Width << std::endl
|
|
<< "Höhe: " << ui32Height << std::endl
|
|
<< "Bit pro Pixel: " << ui32BpP << std::endl
|
|
<< "Bild Attribute: " << ui32Attribut << std::endl;*/
|
|
|
|
// jump to the data block
|
|
fsPicture.seekg(ui32IDLength + ui32PaletteLength, std::ios_base::cur);
|
|
|
|
// If not compressed 24 or 32 bit
|
|
if (ui32PicType == 2 && (ui32BpP == 24 || ui32BpP == 32))
|
|
{
|
|
fsPicture.read(reinterpret_cast<char*>(vui8Pixels.data()), ui32Size);
|
|
}
|
|
// else if compressed 24 or 32 bit
|
|
else if (ui32PicType == 10 && (ui32BpP == 24 || ui32BpP == 32)) // compressed
|
|
{
|
|
std::uint8_t tempChunkHeader;
|
|
std::uint8_t tempData[5];
|
|
int tempByteIndex = 0;
|
|
std::size_t tempPixelIndex = 0;
|
|
|
|
do {
|
|
fsPicture.read(reinterpret_cast<char*>(&tempChunkHeader), sizeof(tempChunkHeader));
|
|
|
|
if (tempChunkHeader >> 7) // repeat count
|
|
{
|
|
// just use the first 7 bits
|
|
tempChunkHeader = (uint8_t(tempChunkHeader << 1) >> 1);
|
|
|
|
fsPicture.read(reinterpret_cast<char*>(&tempData), ui32BpP/8);
|
|
|
|
for (int i = 0; i <= tempChunkHeader; i++)
|
|
{
|
|
vui8Pixels[tempByteIndex++] = tempData[0];
|
|
vui8Pixels[tempByteIndex++] = tempData[1];
|
|
vui8Pixels[tempByteIndex++] = tempData[2];
|
|
if(ui32BpP == 32) vui8Pixels[tempByteIndex++] = tempData[3];
|
|
}
|
|
}
|
|
else // data count
|
|
{
|
|
// just use the first 7 bits
|
|
tempChunkHeader = (uint8_t(tempChunkHeader << 1) >> 1);
|
|
|
|
for (int i = 0; i <= tempChunkHeader; i++)
|
|
{
|
|
fsPicture.read(reinterpret_cast<char*>(&tempData), ui32BpP/8);
|
|
|
|
vui8Pixels[tempByteIndex++] = tempData[0];
|
|
vui8Pixels[tempByteIndex++] = tempData[1];
|
|
vui8Pixels[tempByteIndex++] = tempData[2];
|
|
if (ui32BpP == 32) vui8Pixels[tempByteIndex++] = tempData[3];
|
|
}
|
|
}
|
|
} while (tempByteIndex < ui32Size);
|
|
}
|
|
// not useable format
|
|
else
|
|
{
|
|
fsPicture.close();
|
|
throw std::invalid_argument("Invaild File Format! Required 24 or 31 Bit Image.");
|
|
}
|
|
|
|
fsPicture.close();
|
|
}
|
|
|
|
TextureTGA::~TextureTGA()
|
|
{
|
|
vui8Pixels.clear();
|
|
}
|
|
|
|
std::vector<std::uint8_t> TextureTGA::getData() const
|
|
{
|
|
return vui8Pixels;
|
|
}
|
|
|
|
bool TextureTGA::hasAlpha() const
|
|
{
|
|
return ui32BpP == 32;
|
|
}
|
|
|
|
std::uint32_t TextureTGA::getWidth() const
|
|
{
|
|
return ui32Width;
|
|
}
|
|
|
|
std::uint32_t TextureTGA::getHeight() const
|
|
{
|
|
return ui32Height;
|
|
}
|