std::optional<ImageData2D> StbImageImporter::doImage2D(UnsignedInt) {
Vector2i size;
Int components;
stbi_uc* const data = stbi_load_from_memory(_in, _in.size(), &size.x(), &size.y(), &components, 0);
if(!data) {
Error() << "Trade::StbImageImporter::image2D(): cannot open the image:" << stbi_failure_reason();
return std::nullopt;
}
ColorFormat format;
switch(components) {
case 1:
#ifndef MAGNUM_TARGET_GLES2
format = ColorFormat::Red;
#else
format = Context::current() && Context::current()->isExtensionSupported<Extensions::GL::EXT::texture_rg>() ?
ColorFormat::Red : ColorFormat::Luminance;
#endif
break;
case 2:
#ifndef MAGNUM_TARGET_GLES2
format = ColorFormat::RG;
#else
format = Context::current() && Context::current()->isExtensionSupported<Extensions::GL::EXT::texture_rg>() ?
ColorFormat::RG : ColorFormat::LuminanceAlpha;
#endif
break;
case 3: format = ColorFormat::RGB; break;
case 4: format = ColorFormat::RGBA; break;
default: CORRADE_ASSERT_UNREACHABLE();
}
/* Copy the data with reversed row order to a new[]-allocated array so we
can delete[] it later (the original data with must be deleted with free()) */
unsigned char* const imageData = new unsigned char[size.product()*components];
for(Int y = 0; y != size.y(); ++y) {
const Int stride = size.x()*components;
std::copy(data + y*stride, data + (y + 1)*stride, imageData + (size.y() - y - 1)*stride);
}
stbi_image_free(data);
return Trade::ImageData2D(format, ColorType::UnsignedByte, size, imageData);
}
Containers::Optional<ImageData2D> DevIlImageImporter::doImage2D(UnsignedInt) {
ILuint imgID = 0;
ilGenImages(1, &imgID);
ilBindImage(imgID);
/* So we can use the shorter if(!ilFoo()) */
static_assert(!IL_FALSE, "IL_FALSE doesn't have a zero value");
if(!ilLoadL(IL_TYPE_UNKNOWN, _in, _in.size())) {
/* iluGetString() returns empty string for 0x512, which is even more
useless than just returning the error ID */
Error() << "Trade::DevIlImageImporter::image2D(): cannot open the image:" << ilGetError();
return Containers::NullOpt;
}
const Vector2i size{ilGetInteger(IL_IMAGE_WIDTH), ilGetInteger(IL_IMAGE_HEIGHT)};
Int components;
bool rgbaNeeded = false;
PixelFormat format;
switch(ilGetInteger(IL_IMAGE_FORMAT)) {
/* Grayscale */
case IL_LUMINANCE:
format = PixelFormat::R8Unorm;
components = 1;
break;
/* Grayscale + alpha */
case IL_LUMINANCE_ALPHA:
format = PixelFormat::RG8Unorm;
components = 2;
break;
/* BGR */
case IL_BGR:
rgbaNeeded = true;
format = PixelFormat::RGB8Unorm;
components = 3;
break;
/* BGRA */
case IL_BGRA:
rgbaNeeded = true;
format = PixelFormat::RGBA8Unorm;
components = 4;
break;
/* RGB */
case IL_RGB:
format = PixelFormat::RGB8Unorm;
components = 3;
break;
/* RGBA */
case IL_RGBA:
format = PixelFormat::RGBA8Unorm;
components = 4;
break;
/* No idea, convert to RGBA */
default:
format = PixelFormat::RGBA8Unorm;
components = 4;
rgbaNeeded = true;
}
/* If the format isn't one we recognize, convert to RGB(A) */
if(rgbaNeeded && !ilConvertImage(components == 3 ? IL_RGB : IL_RGBA, IL_UNSIGNED_BYTE)) {
/* iluGetString() returns empty string for 0x512, which is even
more useless than just returning the error ID */
Error() << "Trade::DevIlImageImporter::image2D(): cannot convert image:" << ilGetError();
return Containers::NullOpt;
}
/* Flip the image to match OpenGL's conventions */
/** @todo use our own routine to avoid linking to ILU */
ILinfo ImageInfo;
iluGetImageInfo(&ImageInfo);
if(ImageInfo.Origin == IL_ORIGIN_UPPER_LEFT)
iluFlipImage();
/* Copy the data into array that is owned by us and not by IL */
Containers::Array<char> imageData{std::size_t(size.product()*components)};
std::copy_n(reinterpret_cast<char*>(ilGetData()), imageData.size(), imageData.begin());
/* Release the texture back to DevIL */
ilDeleteImages(1, &imgID);
/* Adjust pixel storage if row size is not four byte aligned */
PixelStorage storage;
if((size.x()*components)%4 != 0)
storage.setAlignment(1);
return Trade::ImageData2D{storage, format, size, std::move(imageData)};
}
std::optional<ImageData2D> TgaImporter::doImage2D(UnsignedInt) {
/* Check if the file is long enough */
if(_in.size() < std::streamoff(sizeof(TgaHeader))) {
Error() << "Trade::TgaImporter::image2D(): the file is too short:" << _in.size() << "bytes";
return std::nullopt;
}
const TgaHeader& header = *reinterpret_cast<const TgaHeader*>(_in.data());
/* Size in machine endian */
const Vector2i size{Utility::Endianness::littleEndian(header.width),
Utility::Endianness::littleEndian(header.height)};
/* Image format */
PixelFormat format;
if(header.colorMapType != 0) {
Error() << "Trade::TgaImporter::image2D(): paletted files are not supported";
return std::nullopt;
}
/* Color */
if(header.imageType == 2) {
switch(header.bpp) {
case 24:
format = PixelFormat::RGB;
break;
case 32:
format = PixelFormat::RGBA;
break;
default:
Error() << "Trade::TgaImporter::image2D(): unsupported color bits-per-pixel:" << header.bpp;
return std::nullopt;
}
/* Grayscale */
} else if(header.imageType == 3) {
#if defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
format = Context::hasCurrent() && Context::current().isExtensionSupported<Extensions::GL::EXT::texture_rg>() ?
PixelFormat::Red : PixelFormat::Luminance;
#elif !(defined(MAGNUM_TARGET_WEBGL) && defined(MAGNUM_TARGET_GLES2))
format = PixelFormat::Red;
#else
format = PixelFormat::Luminance;
#endif
if(header.bpp != 8) {
Error() << "Trade::TgaImporter::image2D(): unsupported grayscale bits-per-pixel:" << header.bpp;
return std::nullopt;
}
/* Compressed files */
} else {
Error() << "Trade::TgaImporter::image2D(): unsupported (compressed?) image type:" << header.imageType;
return std::nullopt;
}
Containers::Array<char> data{std::size_t(size.product())*header.bpp/8};
std::copy_n(_in + sizeof(TgaHeader), data.size(), data.begin());
/* Adjust pixel storage if row size is not four byte aligned */
PixelStorage storage;
if((size.x()*header.bpp/8)%4 != 0)
storage.setAlignment(1);
if(format == PixelFormat::RGB) {
auto pixels = reinterpret_cast<Math::Vector3<UnsignedByte>*>(data.data());
std::transform(pixels, pixels + size.product(), pixels,
[](Math::Vector3<UnsignedByte> pixel) { return Math::swizzle<'b', 'g', 'r'>(pixel); });
} else if(format == PixelFormat::RGBA) {
auto pixels = reinterpret_cast<Math::Vector4<UnsignedByte>*>(data.data());
std::transform(pixels, pixels + size.product(), pixels,
[](Math::Vector4<UnsignedByte> pixel) { return Math::swizzle<'b', 'g', 'r', 'a'>(pixel); });
}
return ImageData2D{storage, format, PixelType::UnsignedByte, size, std::move(data)};
}
std::optional<ImageData2D> JpegImporter::doImage2D(UnsignedInt) {
/* Initialize structures */
jpeg_decompress_struct file;
JSAMPARRAY rows = nullptr;
unsigned char* data = nullptr;
/* Fugly error handling stuff */
/** @todo Get rid of this crap */
struct ErrorManager {
jpeg_error_mgr jpegErrorManager;
std::jmp_buf setjmpBuffer;
} errorManager;
file.err = jpeg_std_error(&errorManager.jpegErrorManager);
errorManager.jpegErrorManager.error_exit = [](j_common_ptr info) {
info->err->output_message(info);
std::longjmp(reinterpret_cast<ErrorManager*>(info->err)->setjmpBuffer, 1);
};
if(setjmp(errorManager.setjmpBuffer)) {
Error() << "Trade::JpegImporter::image2D(): error while reading JPEG file";
jpeg_destroy_decompress(&file);
delete[] rows;
delete[] data;
return std::nullopt;
}
/* Open file */
jpeg_create_decompress(&file);
jpeg_mem_src(&file, _in.begin(), _in.size());
/* Read file header, start decompression */
jpeg_read_header(&file, true);
jpeg_start_decompress(&file);
/* Image size and type */
const Vector2i size(file.output_width, file.output_height);
static_assert(BITS_IN_JSAMPLE == 8, "Only 8-bit JPEG is supported");
constexpr const ImageType type = ImageType::UnsignedByte;
/* Image format */
ImageFormat format;
switch(file.out_color_space) {
case JCS_GRAYSCALE:
CORRADE_INTERNAL_ASSERT(file.out_color_components == 1);
#ifdef MAGNUM_TARGET_GLES
format = Context::current() && Context::current()->isExtensionSupported<Extensions::GL::EXT::texture_rg>() ?
ImageFormat::Red : ImageFormat::Luminance;
#else
format = ImageFormat::Red;
#endif
break;
case JCS_RGB:
CORRADE_INTERNAL_ASSERT(file.out_color_components == 3);
format = ImageFormat::RGB;
break;
/** @todo RGBA (only in libjpeg-turbo and probably ignored) */
default:
Error() << "Trade::JpegImporter::image2D(): unsupported color space" << file.out_color_space;
}
/* Initialize data array */
data = new unsigned char[size.product()*file.out_color_components*BITS_IN_JSAMPLE/8];
/* Read image row by row */
rows = new JSAMPROW[size.y()];
const Int stride = size.x()*file.out_color_components*BITS_IN_JSAMPLE/8;
for(Int i = 0; i != size.y(); ++i)
rows[i] = data + (size.y() - i - 1)*stride;
while(file.output_scanline < file.output_height)
jpeg_read_scanlines(&file, rows+file.output_scanline, file.output_height-file.output_scanline);
delete[] rows;
rows = nullptr;
/* Cleanup */
jpeg_finish_decompress(&file);
jpeg_destroy_decompress(&file);
return Trade::ImageData2D(format, type, size, data);
}
