120 lines
3.1 KiB
C++
120 lines
3.1 KiB
C++
#include "Texture.h"
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#include <fstream>
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TextureTGA::TextureTGA(const char * filePath)
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{
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// open the file
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std::fstream fsPicture(filePath, std::ios::in | std::ios::binary);
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if (!fsPicture.is_open())
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throw std::invalid_argument(std::string("file not found: ") += filePath);
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// read in the header
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std::uint8_t ui8x18Header[19] = { 0 };
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fsPicture.read(reinterpret_cast<char*>(&ui8x18Header), sizeof(ui8x18Header)-1);
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//get variables
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vui8Pixels = new std::vector<std::uint8_t>;
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bool bCompressed;
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std::uint32_t ui32IDLength;
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std::uint32_t ui32PicType;
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std::uint32_t ui32PaletteLength;
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std::uint32_t ui32Size;
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// extract all information from header
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ui32IDLength = ui8x18Header[0];
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ui32PicType = ui8x18Header[2];
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ui32PaletteLength = ui8x18Header[6] * 0x100 + ui8x18Header[5];
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ui32Width = ui8x18Header[13] * 0x100 + ui8x18Header[12];
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ui32Height = ui8x18Header[15] * 0x100 + ui8x18Header[14];
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ui32BpP = ui8x18Header[16];
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// calculate some more information
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ui32Size = ui32Width * ui32Height * ui32BpP/8;
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bCompressed = ui32PicType == 9 || ui32PicType == 10;
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vui8Pixels->resize(ui32Size);
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// jump to the data block
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fsPicture.seekg(ui32IDLength + ui32PaletteLength, std::ios_base::cur);
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// If not compressed 24 or 32 bit
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if (ui32PicType == 2 && (ui32BpP == 24 || ui32BpP == 32))
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{
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fsPicture.read(reinterpret_cast<char*>(vui8Pixels->data()), ui32Size);
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}
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// else if compressed 24 or 32 bit
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else if (ui32PicType == 10 && (ui32BpP == 24 || ui32BpP == 32)) // compressed
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{
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std::uint8_t tempChunkHeader;
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std::uint8_t tempData[5];
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unsigned int tempByteIndex = 0;
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do {
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fsPicture.read(reinterpret_cast<char*>(&tempChunkHeader), sizeof(tempChunkHeader));
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if (tempChunkHeader >> 7) // repeat count
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{
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// just use the first 7 bits
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tempChunkHeader = (uint8_t(tempChunkHeader << 1) >> 1);
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fsPicture.read(reinterpret_cast<char*>(&tempData), ui32BpP/8);
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for (int i = 0; i <= tempChunkHeader; i++)
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{
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vui8Pixels->at(tempByteIndex++) = tempData[0];
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vui8Pixels->at(tempByteIndex++) = tempData[1];
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vui8Pixels->at(tempByteIndex++) = tempData[2];
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if(ui32BpP == 32) vui8Pixels->at(tempByteIndex++) = tempData[3];
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}
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}
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else // data count
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{
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// just use the first 7 bits
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tempChunkHeader = (uint8_t(tempChunkHeader << 1) >> 1);
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for (int i = 0; i <= tempChunkHeader; i++)
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{
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fsPicture.read(reinterpret_cast<char*>(&tempData), ui32BpP/8);
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vui8Pixels->at(tempByteIndex++) = tempData[0];
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vui8Pixels->at(tempByteIndex++) = tempData[1];
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vui8Pixels->at(tempByteIndex++) = tempData[2];
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if (ui32BpP == 32) vui8Pixels->at(tempByteIndex++) = tempData[3];
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}
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}
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} while (tempByteIndex < ui32Size);
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}
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// not useable format
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else
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{
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fsPicture.close();
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throw std::invalid_argument("Invaild File Format! Required 24 or 31 Bit Image.");
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}
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fsPicture.close();
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}
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TextureTGA::~TextureTGA()
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{
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}
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std::vector<std::uint8_t>* TextureTGA::getData() const
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{
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return vui8Pixels;
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}
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bool TextureTGA::hasAlpha() const
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{
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return ui32BpP == 32;
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}
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std::uint32_t TextureTGA::getWidth() const
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{
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return ui32Width;
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}
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std::uint32_t TextureTGA::getHeight() const
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{
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return ui32Height;
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}
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