static RGBSpectrum *ReadImageTGA(const std::string &name, int *width,
int *height) {
tga_image img;
tga_result result;
if ((result = tga_read(&img, name.c_str())) != TGA_NOERR) {
Error("Unable to read from TGA file \"%s\" (%s)", name.c_str(),
tga_error(result));
return nullptr;
}
if (tga_is_right_to_left(&img)) tga_flip_horiz(&img);
if (!tga_is_top_to_bottom(&img)) tga_flip_vert(&img);
if (tga_is_colormapped(&img)) tga_color_unmap(&img);
*width = img.width;
*height = img.height;
// "Unpack" the pixels (origin in the lower left corner).
// TGA pixels are in BGRA format.
RGBSpectrum *ret = new RGBSpectrum[*width * *height];
RGBSpectrum *dst = ret;
for (int y = *height - 1; y >= 0; y--)
for (int x = 0; x < *width; x++) {
uint8_t *src = tga_find_pixel(&img, x, y);
if (tga_is_mono(&img))
*dst++ = RGBSpectrum(*src / 255.f);
else {
Float c[3];
c[2] = src[0] / 255.f;
c[1] = src[1] / 255.f;
c[0] = src[2] / 255.f;
*dst++ = RGBSpectrum::FromRGB(c);
}
}
tga_free_buffers(&img);
Info("Read TGA image %s (%d x %d)", name.c_str(), *width, *height);
return ret;
}
bool loadDepth(const char* pNameFile, ImageBase** ppImage)
{
if (!pNameFile || !ppImage || *ppImage) return false;
tga_image tgaImage;
tga_result result = tga_read(&tgaImage, pNameFile);
if (result != TGA_NOERR) return false;
if (tga_is_colormapped(&tgaImage)) {
tga_color_unmap(&tgaImage);
}
unsigned int width = tgaImage.width;
unsigned int height = tgaImage.height;
unsigned int bitsPerPixel = tgaImage.pixel_depth;
if (bitsPerPixel != 32) return false;
// depth の最大値・最小値を取得
unsigned long minValueDepth = ULONG_MAX;
unsigned long maxValueDepth = 0;
for (unsigned int y = 0; y < tgaImage.height; y ++) {
for (unsigned int x = 0; x < tgaImage.width; x ++) {
unsigned char* pPixel = tga_find_pixel(&tgaImage, x, y);
unsigned char valueR = 0, valueG = 0, valueB = 0, valueA = 0;
tga_unpack_pixel(pPixel, tgaImage.pixel_depth,
&valueB, &valueG, &valueR, &valueA);
unsigned long valueDepth = ((unsigned int)(valueA) << 24) | ((unsigned int)(valueR) << 16) |
((unsigned int)(valueG) << 8) | (unsigned int)(valueB);
if (valueDepth < minValueDepth) minValueDepth = valueDepth;
if (maxValueDepth < valueDepth) maxValueDepth = valueDepth;
}
}
// 最大値・最小値をもとに正規化
unsigned char maxValueElement = ElementUtil::getMaxValue<ImageGray8::TypeElement>();
unsigned char minValueElement = ElementUtil::getMinValue<ImageGray8::TypeElement>();
ImageGray8 *pImage = ImageFactory::createImage<ImageGray8>(tgaImage.width, tgaImage.height);
for (unsigned int y = 0; y < tgaImage.height; y ++) {
for (unsigned int x = 0; x < tgaImage.width; x ++) {
unsigned char* pPixel = tga_find_pixel(&tgaImage, x, y);
unsigned char valueR = 0, valueG = 0, valueB = 0, valueA = 0;
tga_unpack_pixel(pPixel, tgaImage.pixel_depth,
&valueB, &valueG, &valueR, &valueA);
unsigned long valueDepth = ((unsigned int)(valueA) << 24) | ((unsigned int)(valueR) << 16) |
((unsigned int)(valueG) << 8) | (unsigned int)(valueB);
unsigned char valueNormalized = cropValue<unsigned char>((unsigned char)(float(maxValueElement) * float(valueDepth - minValueDepth) / float(maxValueDepth - minValueDepth)),
minValueElement, maxValueElement);
unsigned char value = maxValueElement - valueNormalized;
pImage->setPixel(x, y, ImageGray8::TypePixel(value));
}
}
tga_free_buffers(&tgaImage);
*ppImage = static_cast<ImageBase*>(pImage);
return pImage ? true : false;
}
