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linux-wallpaperengine/wallpaperengine/irr/CImageLoaderTEX.cpp

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#include "CImageLoaderTEX.h"
#include <irrlicht/irrlicht.h>
#include <lz4.h>
#include <wallpaperengine/irrlicht.h>
#include <string>
#include <algorithm>
namespace irr {
namespace video {
//! returns true if the file maybe is able to be loaded by this class
//! based on the file extension (e.g. ".tga")
bool CImageLoaderTex::isALoadableFileExtension (const io::path &filename) const
{
return core::hasFileExtension (filename, "tex");
}
//! returns true if the file maybe is able to be loaded by this class
bool CImageLoaderTex::isALoadableFileFormat (io::IReadFile *file) const
{
return false;
}
// load in the image data
IImage *CImageLoaderTex::loadImage (io::IReadFile *input) const
{
if (!input)
return nullptr;
video::IImage *image = nullptr;
char buffer [1024];
if (input->read (buffer, 9) != 9)
{
wp::irrlicht::device->getLogger ()->log ("LOAD TEX: cannot read header\n", input->getFileName ().c_str (), irr::ELL_ERROR);
return nullptr;
}
if (memcmp (buffer, "TEXV0005", 9) != 0)
{
wp::irrlicht::device->getLogger ()->log ("LOAD TEX: not really a tex\n", input->getFileName ().c_str (), irr::ELL_ERROR);
return nullptr;
}
if (input->read (buffer, 9) != 9)
{
wp::irrlicht::device->getLogger ()->log ("LOAD TEX: cannot read second header\n", input->getFileName ().c_str (), irr::ELL_ERROR);
return nullptr;
}
if (memcmp (buffer, "TEXI0001", 9) != 0)
{
wp::irrlicht::device->getLogger ()->log ("LOAD TEX: not really a tex\n", input->getFileName ().c_str (), irr::ELL_ERROR);
return nullptr;
}
u32 width;
u32 height;
u32 texture_width;
u32 texture_height;
u32 format;
u32 imageFormat = FREE_IMAGE_FORMAT::FIF_UNKNOWN;
u8 containerVersion = 0;
input->read (&format, 4);
input->seek (4, true); // ignore bytes
input->read (&texture_width, 4);
input->read (&texture_height, 4);
input->read (&width, 4);
input->read (&height, 4);
input->seek (4, true); // ignore bytes
input->read (buffer, 9);
if (input->getFileName().find("materials/util/white.tex") != std::string::npos)
{
// relevant shaders are currently drawing these masks opaque; return a transparent image instead
wp::irrlicht::device->getLogger ()->log ("LOAD TEX: Skipping broken mask", input->getFileName ().c_str (), irr::ELL_INFORMATION);
return wp::irrlicht::driver->createImage (ECF_A8R8G8B8, irr::core::dimension2d<u32> (width, height));
}
if (memcmp (buffer, "TEXB0003", 9) == 0)
{
containerVersion = 3;
input->seek (4, true);
input->read (&imageFormat, 4);
}
else if (memcmp (buffer, "TEXB0002", 9) == 0)
{
containerVersion = 2;
input->seek (4, true);
}
else if (memcmp (buffer, "TEXB0001", 9) == 0)
{
containerVersion = 1;
input->seek (4, true);
}
else
{
wp::irrlicht::device->getLogger ()->log ("LOAD TEX: Unknown container type\n", input->getFileName ().c_str (), irr::ELL_ERROR);
return nullptr;
}
if (format == TextureFormat::A8)
{
wp::irrlicht::device->getLogger ()-> log ("LOAD TEX: A8 not supported\n", input->getFileName ().c_str (), irr::ELL_ERROR);
return nullptr;
}
if (format == TextureFormat::RA88)
{
wp::irrlicht::device->getLogger ()->log ("LOAD TEX: RA88 not supported\n", input->getFileName ().c_str (), irr::ELL_ERROR);
return nullptr;
}
u32 mipmap_count = 0;
input->read (&mipmap_count, 4);
u32 mipmap_width = 0;
u32 mipmap_height = 0;
u32 mipmap_compression = 0;
u32 mipmap_uncompressed_size = 0;
u32 mipmap_compressed_size = 0;
input->read (&mipmap_width, 4);
input->read (&mipmap_height, 4);
if (containerVersion > 1)
{
input->read (&mipmap_compression, 4);
input->read (&mipmap_uncompressed_size, 4);
}
input->read (&mipmap_compressed_size, 4);
// TODO: BETTER POSITION FOR THIS
if (mipmap_compression == 0)
{
// this might be better named as mipmap_bytes_size instead of compressed_size
// as in uncompressed files this variable actually holds the file length
mipmap_uncompressed_size = mipmap_compressed_size;
}
char *decompressedBuffer = new char [mipmap_uncompressed_size];
if (mipmap_compression == 1)
{
char *compressedBuffer = new char [mipmap_compressed_size];
input->read (compressedBuffer, mipmap_compressed_size);
int result = LZ4_decompress_safe (compressedBuffer, decompressedBuffer, mipmap_compressed_size, mipmap_uncompressed_size);
if (!result)
{
delete [] decompressedBuffer;
delete [] compressedBuffer;
wp::irrlicht::device->getLogger ()->log ("LOAD TEX: cannot decompress texture data\n", input->getFileName ().c_str (), irr::ELL_ERROR);
return nullptr;
}
delete [] compressedBuffer;
}
else
{
input->read (decompressedBuffer, mipmap_uncompressed_size);
}
if (imageFormat == FREE_IMAGE_FORMAT::FIF_UNKNOWN)
{
image = wp::irrlicht::driver->createImage (ECF_A8R8G8B8, irr::core::dimension2d<u32> (width, height));
if (!image)
{
delete [] decompressedBuffer;
delete image;
wp::irrlicht::device->getLogger ()->log ("LOAD TEX: cannot create destination image\n", input->getFileName ().c_str (), irr::ELL_ERROR);
return nullptr;
}
switch (format)
{
case TextureFormat::ARGB8888:
wp::irrlicht::device->getLogger ()->log ("LOAD TEX: This is an ARGB8", input->getFileName ().c_str (), irr::ELL_INFORMATION);
this->loadImageFromARGB8Data (image, decompressedBuffer, width, height, mipmap_width);
break;
case TextureFormat::DXT1:
wp::irrlicht::device->getLogger ()->log ("LOAD TEX: This is a DXT1", input->getFileName ().c_str (), irr::ELL_INFORMATION);
this->loadImageFromDXT1 (image, decompressedBuffer, width, height, mipmap_width, mipmap_height);
break;
case TextureFormat::DXT3:
wp::irrlicht::device->getLogger ()->log ("LOAD TEX: This is a DXT3", input->getFileName ().c_str (), irr::ELL_INFORMATION);
this->loadImageFromDXT3 (image, decompressedBuffer, width, height, mipmap_width, mipmap_height);
break;
case TextureFormat::DXT5:
wp::irrlicht::device->getLogger ()->log ("LOAD TEX: This is a DXT5", input->getFileName ().c_str (), irr::ELL_INFORMATION);
this->loadImageFromDXT5 (image, decompressedBuffer, width, height, mipmap_width, mipmap_height);
break;
default:
delete [] decompressedBuffer;
delete image;
wp::irrlicht::device->getLogger ()->log ("LOAD TEX: Unknown texture format\n", input->getFileName ().c_str (), irr::ELL_ERROR);
return nullptr;
}
}
else
{
// copy the buffer to a new address
char* filebuffer = new char [mipmap_uncompressed_size];
char tmpname [TMP_MAX];
// copy file data to the final file buffer to be used
memcpy (filebuffer, decompressedBuffer, mipmap_uncompressed_size);
// generate temporal name
mkstemp (tmpname);
// store it in a std::string
std::string filename = tmpname;
irr::io::IReadFile* file;
// free image format
switch (imageFormat)
{
case FREE_IMAGE_FORMAT::FIF_BMP:
// add extension to the file
filename += ".bmp";
wp::irrlicht::device->getLogger ()->log ("LOAD TEX: This is a BMP", input->getFileName ().c_str (), irr::ELL_INFORMATION);
file = wp::irrlicht::device->getFileSystem ()->createMemoryReadFile (filebuffer, mipmap_uncompressed_size, filename.c_str (), true);
break;
case FREE_IMAGE_FORMAT::FIF_PNG:
// add extension to the file
filename += ".png";
wp::irrlicht::device->getLogger ()->log ("LOAD TEX: This is a PNG", input->getFileName ().c_str (), irr::ELL_INFORMATION);
file = wp::irrlicht::device->getFileSystem ()->createMemoryReadFile (filebuffer, mipmap_uncompressed_size, filename.c_str (), true);
break;
case FREE_IMAGE_FORMAT::FIF_JPEG:
// add extension to the file
filename += ".jpg";
wp::irrlicht::device->getLogger ()->log ("LOAD TEX: This is a JPG", input->getFileName ().c_str (), irr::ELL_INFORMATION);
//wp::irrlicht::device->getFileSystem ()->createAndWriteFile ("/tmp/test.jpg", false)->write (filebuffer, mipmap_uncompressed_size);
file = wp::irrlicht::device->getFileSystem ()->createMemoryReadFile (filebuffer, mipmap_uncompressed_size, filename.c_str (), true);
break;
case FREE_IMAGE_FORMAT::FIF_GIF:
filename += ".gif";
wp::irrlicht::device->getLogger ()->log ("LOAD TEX: This is a GIF", input->getFileName ().c_str (), irr::ELL_INFORMATION);
file = wp::irrlicht::device->getFileSystem ()->createMemoryReadFile (filebuffer, mipmap_uncompressed_size, filename.c_str (), true);
break;
default:
wp::irrlicht::device->getLogger ()->log ("LOAD TEX: detected unsupported free-image format\n", input->getFileName ().c_str (), irr::ELL_ERROR);
delete [] decompressedBuffer;
delete [] filebuffer;
return nullptr;
}
image = wp::irrlicht::driver->createImageFromFile (file);
if (!image)
{
file->drop ();
delete [] decompressedBuffer;
delete image;
wp::irrlicht::device->getLogger ()->log ("LOAD TEX: cannot create destination image\n", input->getFileName ().c_str (), irr::ELL_ERROR);
return nullptr;
}
}
delete [] decompressedBuffer;
#if 0
// dump image to TGA file (adapted from maluoi's gist)
u32 bytesPerPixel = image->getBytesPerPixel ();
if (bytesPerPixel != 3 && bytesPerPixel != 4)
wp::irrlicht::device->getLogger ()->log (("Unexpected bytesPerPixel of " + std::to_string (bytesPerPixel)).c_str (), input->getFileName ().c_str (), irr::ELL_ERROR);
char hasNoAlpha = (bytesPerPixel < 4);
std::string fileName = input->getFileName ().c_str ();
std::replace (fileName.begin (), fileName.end (), '/', '-');
std::string path = std::string (getenv("HOME")) + "/stuff/wallpaperengine-dumps/";
system (("mkdir -p " + path).c_str ());
path += fileName + ".tga";
FILE *dumpFile = fopen (path.c_str (), "wb");
uint8_t header[18] = { 0,0,2,0,0,0,0,0,0,0,0,0,
(uint8_t)(width%256), (uint8_t)(width/256), (uint8_t)(height%256), (uint8_t)(height/256), 32, 32 };
fwrite (&header, 18, 1, dumpFile);
char *imagedata = (char *) image->lock ();
for (u32 y = 0; y < image->getDimension ().Height; y ++)
{
u32 baseDestination = y * image->getPitch ();
for (u32 x = 0; x < width; x ++)
{
static unsigned char color[4];
color[0+2*hasNoAlpha] = imagedata [baseDestination + (x * bytesPerPixel) + 0]; // b
color[1] = imagedata [baseDestination + (x * bytesPerPixel) + 1]; // g
color[2-2*hasNoAlpha] = imagedata [baseDestination + (x * bytesPerPixel) + 2]; // r
color[3] = 255*hasNoAlpha | imagedata [baseDestination + (x * bytesPerPixel) + 3]; // a
fwrite (color, 1, 4, dumpFile);
}
}
image->unlock ();
fclose (dumpFile);
#endif
return image;
}
void CImageLoaderTex::loadImageFromARGB8Data (IImage* output, const char* input, u32 width, u32 height, u32 mipmap_width) const
{
u32 bytesPerPixel = output->getBytesPerPixel ();
char *imagedata = (char *) output->lock ();
for (u32 y = 0; y < height; y ++)
{
u32 baseDestination = y * output->getPitch ();
u32 baseOrigin = y * (mipmap_width * 4);
for (u32 x = 0; x < width; x ++)
{
imagedata [baseDestination + (x * bytesPerPixel) + 2] = input [baseOrigin + (x * 4) + 0]; // r
imagedata [baseDestination + (x * bytesPerPixel) + 1] = input [baseOrigin + (x * 4) + 1]; // g
imagedata [baseDestination + (x * bytesPerPixel) + 0] = input [baseOrigin + (x * 4) + 2]; // b
imagedata [baseDestination + (x * bytesPerPixel) + 3] = input [baseOrigin + (x * 4) + 3]; // a
}
}
output->unlock ();
}
void CImageLoaderTex::loadImageFromDXT1 (IImage* output, const char* input, u32 destination_width, u32 destination_height, u32 origin_width, u32 origin_height) const
{
char* decompressedBuffer = new char [origin_width * origin_height * 4];
this->BlockDecompressImageDXT1 (origin_width, origin_height, (const unsigned char*) input, (unsigned long*) decompressedBuffer);
this->loadImageFromARGB8Data (output, decompressedBuffer, destination_width, destination_height, origin_width);
delete [] decompressedBuffer;
}
void CImageLoaderTex::loadImageFromDXT3 (IImage* output, const char* input, u32 destination_width, u32 destination_height, u32 origin_width, u32 origin_height) const
{
char* decompressedBuffer = new char [origin_width * origin_height * 4];
this->BlockDecompressImageDXT3 (origin_width, origin_height, (const unsigned char*) input, (unsigned long*) decompressedBuffer);
this->loadImageFromARGB8Data (output, decompressedBuffer, destination_width, destination_height, origin_width);
delete [] decompressedBuffer;
}
void CImageLoaderTex::loadImageFromDXT5 (IImage* output, const char* input, u32 destination_width, u32 destination_height, u32 origin_width, u32 origin_height) const
{
char* decompressedBuffer = new char [origin_width * origin_height * 4];
this->BlockDecompressImageDXT5 (origin_width, origin_height, (const unsigned char*) input, (unsigned long*) decompressedBuffer);
this->loadImageFromARGB8Data (output, decompressedBuffer, destination_width, destination_height, origin_width);
delete [] decompressedBuffer;
}
// ------------------------------------------------------------------------------------
// The following code is a slightly modified version of this repository
// https://github.com/Benjamin-Dobell/s3tc-dxt-decompression
// ------------------------------------------------------------------------------------
// unsigned long PackRGBA(): Helper method that packs RGBA channels into a single 4 byte pixel.
//
// unsigned char r: red channel.
// unsigned char g: green channel.
// unsigned char b: blue channel.
// unsigned char a: alpha channel.
unsigned long CImageLoaderTex::PackRGBA (unsigned char r, unsigned char g, unsigned char b, unsigned char a) const
{
return r | (g << 8) | (b << 16) | (a << 24);
}
// void DecompressBlockDXT1(): Decompresses one block of a DXT1 texture and stores the resulting pixels at the appropriate offset in 'image'.
//
// unsigned long x: x-coordinate of the first pixel in the block.
// unsigned long y: y-coordinate of the first pixel in the block.
// unsigned long width: width of the texture being decompressed.
// unsigned long height: height of the texture being decompressed.
// const unsigned char *blockStorage: pointer to the block to decompress.
// unsigned long *image: pointer to image where the decompressed pixel data should be stored.
void CImageLoaderTex::DecompressBlockDXT1 (unsigned long x, unsigned long y, unsigned long width, const unsigned char *blockStorage, unsigned long *image) const
{
unsigned short color0 = *reinterpret_cast<const unsigned short *>(blockStorage);
unsigned short color1 = *reinterpret_cast<const unsigned short *>(blockStorage + 2);
unsigned long temp;
temp = (color0 >> 11) * 255 + 16;
unsigned char r0 = (unsigned char)((temp/32 + temp)/32);
temp = ((color0 & 0x07E0) >> 5) * 255 + 32;
unsigned char g0 = (unsigned char)((temp/64 + temp)/64);
temp = (color0 & 0x001F) * 255 + 16;
unsigned char b0 = (unsigned char)((temp/32 + temp)/32);
temp = (color1 >> 11) * 255 + 16;
unsigned char r1 = (unsigned char)((temp/32 + temp)/32);
temp = ((color1 & 0x07E0) >> 5) * 255 + 32;
unsigned char g1 = (unsigned char)((temp/64 + temp)/64);
temp = (color1 & 0x001F) * 255 + 16;
unsigned char b1 = (unsigned char)((temp/32 + temp)/32);
unsigned long code = *reinterpret_cast<const unsigned long *>(blockStorage + 4);
for (int j=0; j < 4; j++)
{
for (int i=0; i < 4; i++)
{
unsigned long finalColor = 0;
unsigned char positionCode = (code >> 2*(4*j+i)) & 0x03;
if (color0 > color1)
{
switch (positionCode)
{
case 0:
finalColor = PackRGBA (r0, g0, b0, 255);
break;
case 1:
finalColor = PackRGBA (r1, g1, b1, 255);
break;
case 2:
finalColor = PackRGBA ((2*r0+r1)/3, (2*g0+g1)/3, (2*b0+b1)/3, 255);
break;
case 3:
finalColor = PackRGBA ((r0+2*r1)/3, (g0+2*g1)/3, (b0+2*b1)/3, 255);
break;
}
}
else
{
switch (positionCode)
{
case 0:
finalColor = PackRGBA (r0, g0, b0, 255);
break;
case 1:
finalColor = PackRGBA (r1, g1, b1, 255);
break;
case 2:
finalColor = PackRGBA ((r0+r1)/2, (g0+g1)/2, (b0+b1)/2, 255);
break;
case 3:
finalColor = PackRGBA (0, 0, 0, 255);
break;
}
}
reinterpret_cast<u32 *>(image)[(y + j)*width + x + i] = finalColor;
}
}
}
// void BlockDecompressImageDXT1(): Decompresses all the blocks of a DXT1 compressed texture and stores the resulting pixels in 'image'.
//
// unsigned long width: Texture width.
// unsigned long height: Texture height.
// const unsigned char *blockStorage: pointer to compressed DXT1 blocks.
// unsigned long *image: pointer to the image where the decompressed pixels will be stored.
void CImageLoaderTex::BlockDecompressImageDXT1(unsigned long width, unsigned long height, const unsigned char *blockStorage, unsigned long *image) const
{
unsigned long blockCountX = (width + 3) / 4;
unsigned long blockCountY = (height + 3) / 4;
unsigned long blockWidth = (width < 4) ? width : 4;
unsigned long blockHeight = (height < 4) ? height : 4;
for (unsigned long j = 0; j < blockCountY; j++)
{
for (unsigned long i = 0; i < blockCountX; i++)
DecompressBlockDXT1 (i*4, j*4, width, blockStorage + i * 8, image);
blockStorage += blockCountX * 8;
}
}
// void DecompressBlockDXT3(): Decompresses one block of a DXT3 texture and stores the resulting pixels at the appropriate offset in 'image'.
//
// unsigned long x: x-coordinate of the first pixel in the block.
// unsigned long y: y-coordinate of the first pixel in the block.
// unsigned long width: width of the texture being decompressed.
// unsigned long height: height of the texture being decompressed.
// const unsigned char *blockStorage: pointer to the block to decompress.
// unsigned long *image: pointer to image where the decompressed pixel data should be stored.
void CImageLoaderTex::DecompressBlockDXT3(unsigned long x, unsigned long y, unsigned long width, const unsigned char *blockStorage, unsigned long *image) const
{
unsigned short color0 = *reinterpret_cast<const unsigned short *>(blockStorage + 8);
unsigned short color1 = *reinterpret_cast<const unsigned short *>(blockStorage + 10);
unsigned long temp;
temp = (color0 >> 11) * 255 + 16;
unsigned char r0 = (unsigned char)((temp/32 + temp)/32);
temp = ((color0 & 0x07E0) >> 5) * 255 + 32;
unsigned char g0 = (unsigned char)((temp/64 + temp)/64);
temp = (color0 & 0x001F) * 255 + 16;
unsigned char b0 = (unsigned char)((temp/32 + temp)/32);
temp = (color1 >> 11) * 255 + 16;
unsigned char r1 = (unsigned char)((temp/32 + temp)/32);
temp = ((color1 & 0x07E0) >> 5) * 255 + 32;
unsigned char g1 = (unsigned char)((temp/64 + temp)/64);
temp = (color1 & 0x001F) * 255 + 16;
unsigned char b1 = (unsigned char)((temp/32 + temp)/32);
unsigned long code = *reinterpret_cast<const unsigned long *>(blockStorage + 12);
unsigned long long alphaCode = *reinterpret_cast<const unsigned long long *>(blockStorage);
for (int j=0; j < 4; j++)
{
for (int i=0; i < 4; i++)
{
unsigned long finalColor = 0;
unsigned char positionCode = (code >> 2*(4*j+i)) & 0x03;
// per StackOverflow this creates an even distribution of alphas between 0 and 255
unsigned char finalAlpha = 17 * (alphaCode >> 4*(4*j+i) & 0x0F);
if (color0 > color1)
{
switch (positionCode)
{
case 0:
finalColor = PackRGBA (r0, g0, b0, finalAlpha);
break;
case 1:
finalColor = PackRGBA (r1, g1, b1, finalAlpha);
break;
case 2:
finalColor = PackRGBA ((2*r0+r1)/3, (2*g0+g1)/3, (2*b0+b1)/3, finalAlpha);
break;
case 3:
finalColor = PackRGBA ((r0+2*r1)/3, (g0+2*g1)/3, (b0+2*b1)/3, finalAlpha);
break;
}
}
else
{
switch (positionCode)
{
case 0:
finalColor = PackRGBA (r0, g0, b0, finalAlpha);
break;
case 1:
finalColor = PackRGBA (r1, g1, b1, finalAlpha);
break;
case 2:
finalColor = PackRGBA ((r0+r1)/2, (g0+g1)/2, (b0+b1)/2, finalAlpha);
break;
case 3:
finalColor = PackRGBA (0, 0, 0, finalAlpha);
break;
}
}
reinterpret_cast<u32 *>(image)[(y + j)*width + x + i] = finalColor;
}
}
}
// void BlockDecompressImageDXT3(): Decompresses all the blocks of a DXT3 compressed texture and stores the resulting pixels in 'image'.
//
// unsigned long width: Texture width.
// unsigned long height: Texture height.
// const unsigned char *blockStorage: pointer to compressed DXT3 blocks.
// unsigned long *image: pointer to the image where the decompressed pixels will be stored.
void CImageLoaderTex::BlockDecompressImageDXT3(unsigned long width, unsigned long height, const unsigned char *blockStorage, unsigned long *image) const
{
unsigned long blockCountX = (width + 3) / 4;
unsigned long blockCountY = (height + 3) / 4;
unsigned long blockWidth = (width < 4) ? width : 4;
unsigned long blockHeight = (height < 4) ? height : 4;
for (unsigned long j = 0; j < blockCountY; j++)
{
for (unsigned long i = 0; i < blockCountX; i++)
DecompressBlockDXT3 (i*4, j*4, width, blockStorage + i * 16, image);
blockStorage += blockCountX * 16;
}
}
// void DecompressBlockDXT5(): Decompresses one block of a DXT5 texture and stores the resulting pixels at the appropriate offset in 'image'.
//
// unsigned long x: x-coordinate of the first pixel in the block.
// unsigned long y: y-coordinate of the first pixel in the block.
// unsigned long width: width of the texture being decompressed.
// unsigned long height: height of the texture being decompressed.
// const unsigned char *blockStorage: pointer to the block to decompress.
// unsigned long *image: pointer to image where the decompressed pixel data should be stored.
void CImageLoaderTex::DecompressBlockDXT5(unsigned long x, unsigned long y, unsigned long width, const unsigned char *blockStorage, unsigned long *image) const
{
unsigned char alpha0 = *reinterpret_cast<const unsigned char *>(blockStorage);
unsigned char alpha1 = *reinterpret_cast<const unsigned char *>(blockStorage + 1);
const unsigned char *bits = blockStorage + 2;
unsigned long alphaCode1 = bits[2] | (bits[3] << 8) | (bits[4] << 16) | (bits[5] << 24);
unsigned short alphaCode2 = bits[0] | (bits[1] << 8);
unsigned short color0 = *reinterpret_cast<const unsigned short *>(blockStorage + 8);
unsigned short color1 = *reinterpret_cast<const unsigned short *>(blockStorage + 10);
unsigned long temp;
temp = (color0 >> 11) * 255 + 16;
unsigned char r0 = (unsigned char)((temp/32 + temp)/32);
temp = ((color0 & 0x07E0) >> 5) * 255 + 32;
unsigned char g0 = (unsigned char)((temp/64 + temp)/64);
temp = (color0 & 0x001F) * 255 + 16;
unsigned char b0 = (unsigned char)((temp/32 + temp)/32);
temp = (color1 >> 11) * 255 + 16;
unsigned char r1 = (unsigned char)((temp/32 + temp)/32);
temp = ((color1 & 0x07E0) >> 5) * 255 + 32;
unsigned char g1 = (unsigned char)((temp/64 + temp)/64);
temp = (color1 & 0x001F) * 255 + 16;
unsigned char b1 = (unsigned char)((temp/32 + temp)/32);
unsigned long code = *reinterpret_cast<const unsigned long *>(blockStorage + 12);
for (int j=0; j < 4; j++)
{
for (int i=0; i < 4; i++)
{
int alphaCodeIndex = 3*(4*j+i);
int alphaCode;
if (alphaCodeIndex <= 12)
{
alphaCode = (alphaCode2 >> alphaCodeIndex) & 0x07;
}
else if (alphaCodeIndex == 15)
{
alphaCode = (alphaCode2 >> 15) | ((alphaCode1 << 1) & 0x06);
}
else // alphaCodeIndex >= 18 && alphaCodeIndex <= 45
{
alphaCode = (alphaCode1 >> (alphaCodeIndex - 16)) & 0x07;
}
unsigned char finalAlpha;
if (alphaCode == 0)
{
finalAlpha = alpha0;
}
else if (alphaCode == 1)
{
finalAlpha = alpha1;
}
else
{
if (alpha0 > alpha1)
{
finalAlpha = ((8-alphaCode)*alpha0 + (alphaCode-1)*alpha1)/7;
}
else
{
if (alphaCode == 6)
finalAlpha = 0;
else if (alphaCode == 7)
finalAlpha = 255;
else
finalAlpha = ((6-alphaCode)*alpha0 + (alphaCode-1)*alpha1)/5;
}
}
unsigned long finalColor = 0;
unsigned char positionCode = (code >> 2*(4*j+i)) & 0x03;
if (color0 > color1)
{
switch (positionCode)
{
case 0:
finalColor = PackRGBA (r0, g0, b0, finalAlpha);
break;
case 1:
finalColor = PackRGBA (r1, g1, b1, finalAlpha);
break;
case 2:
finalColor = PackRGBA ((2*r0+r1)/3, (2*g0+g1)/3, (2*b0+b1)/3, finalAlpha);
break;
case 3:
finalColor = PackRGBA ((r0+2*r1)/3, (g0+2*g1)/3, (b0+2*b1)/3, finalAlpha);
break;
}
}
else
{
switch (positionCode)
{
case 0:
finalColor = PackRGBA (r0, g0, b0, finalAlpha);
break;
case 1:
finalColor = PackRGBA (r1, g1, b1, finalAlpha);
break;
case 2:
finalColor = PackRGBA ((r0+r1)/2, (g0+g1)/2, (b0+b1)/2, finalAlpha);
break;
case 3:
finalColor = PackRGBA (0, 0, 0, finalAlpha);
break;
}
}
reinterpret_cast<u32 *>(image)[(y + j)*width + x + i] = finalColor;
}
}
}
// void BlockDecompressImageDXT5(): Decompresses all the blocks of a DXT5 compressed texture and stores the resulting pixels in 'image'.
//
// unsigned long width: Texture width.
// unsigned long height: Texture height.
// const unsigned char *blockStorage: pointer to compressed DXT5 blocks.
// unsigned long *image: pointer to the image where the decompressed pixels will be stored.
void CImageLoaderTex::BlockDecompressImageDXT5(unsigned long width, unsigned long height, const unsigned char *blockStorage, unsigned long *image) const
{
unsigned long blockCountX = (width + 3) / 4;
unsigned long blockCountY = (height + 3) / 4;
unsigned long blockWidth = (width < 4) ? width : 4;
unsigned long blockHeight = (height < 4) ? height : 4;
for (unsigned long j = 0; j < blockCountY; j++)
{
for (unsigned long i = 0; i < blockCountX; i++)
DecompressBlockDXT5 (i*4, j*4, width, blockStorage + i * 16, image);
blockStorage += blockCountX * 16;
}
}
}// end namespace irr
}//end namespace video
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