unsigned int Texture::compareTGA(IAllocator& allocator,
FS::IFile* file1,
FS::IFile* file2,
int difference)
{
TGAHeader header1, header2;
file1->read(&header1, sizeof(header1));
file2->read(&header2, sizeof(header2));
if (header1.bitsPerPixel != header2.bitsPerPixel ||
header1.width != header2.width || header1.height != header2.height ||
header1.dataType != header2.dataType ||
header1.imageDescriptor != header2.imageDescriptor)
{
g_log_error.log("Renderer")
<< "Trying to compare textures with different formats";
return 0;
}
int color_mode = header1.bitsPerPixel / 8;
if (header1.dataType != 2)
{
g_log_error.log("Renderer") << "Unsupported texture format";
return 0;
}
int different_pixel_count = 0;
size_t pixel_count = header1.width * header1.height;
uint8* img1 = (uint8*)allocator.allocate(pixel_count * color_mode);
uint8* img2 = (uint8*)allocator.allocate(pixel_count * color_mode);
file1->read(img1, pixel_count * color_mode);
file2->read(img2, pixel_count * color_mode);
for (size_t i = 0; i < pixel_count * color_mode; i += color_mode)
{
for (int j = 0; j < color_mode; ++j)
{
if (Math::abs(img1[i + j] - img2[i + j]) > difference)
{
++different_pixel_count;
break;
}
}
}
allocator.deallocate(img1);
allocator.deallocate(img2);
return different_pixel_count;
}
bool Texture::saveTGA(IAllocator& allocator,
FS::IFile* file,
int width,
int height,
int bytes_per_pixel,
const uint8_t* image_dest,
const Path& path)
{
if (bytes_per_pixel != 4)
{
g_log_error.log("renderer")
<< "Texture " << path.c_str()
<< " could not be saved, unsupported TGA format";
return false;
}
uint8_t* data = (uint8_t*)allocator.allocate(width * height * 4);
TGAHeader header;
memset(&header, 0, sizeof(header));
header.bitsPerPixel = (char)(bytes_per_pixel * 8);
header.height = (short)height;
header.width = (short)width;
header.dataType = 2;
file->write(&header, sizeof(header));
for (long y = 0; y < header.height; y++)
{
long read_index = y * header.width * 4;
long write_index = ((header.imageDescriptor & 32) != 0)
? read_index
: y * header.width * 4;
for (long x = 0; x < header.width; x++)
{
data[write_index + 0] = image_dest[write_index + 2];
data[write_index + 1] = image_dest[write_index + 1];
data[write_index + 2] = image_dest[write_index + 0];
data[write_index + 3] = image_dest[write_index + 3];
write_index += 4;
}
}
file->write(data, width * height * 4);
allocator.deallocate(data);
return true;
}
