/* Copyright 2010 Larry Gritz and the other authors and contributors. All Rights Reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of the software's owners nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 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(This is the Modified BSD License) */ #include "sgi_pvt.h" OIIO_PLUGIN_NAMESPACE_BEGIN // Obligatory material to make this a recognizeable imageio plugin OIIO_PLUGIN_EXPORTS_BEGIN OIIO_EXPORT ImageOutput* sgi_output_imageio_create() { return new SgiOutput; } OIIO_EXPORT const char* sgi_output_extensions[] = { "sgi", "rgb", "rgba", "bw", "int", "inta", nullptr }; OIIO_PLUGIN_EXPORTS_END int SgiOutput::supports(string_view feature) const { return (feature == "alpha" || feature == "nchannels"); } bool SgiOutput::open(const std::string& name, const ImageSpec& spec, OpenMode mode) { if (mode != Create) { error("%s does not support subimages or MIP levels", format_name()); return false; } close(); // Close any already-opened file // saving 'name' and 'spec' for later use m_filename = name; m_spec = spec; m_fd = Filesystem::fopen(m_filename, "wb"); if (!m_fd) { error("Unable to open file \"%s\"", m_filename.c_str()); return false; } // SGI image files only supports UINT8 and UINT16. If something // else was requested, revert to the one most likely to be readable // by any SGI reader: UINT8 if (m_spec.format != TypeDesc::UINT8 && m_spec.format != TypeDesc::UINT16) m_spec.set_format(TypeDesc::UINT8); m_dither = (m_spec.format == TypeDesc::UINT8) ? m_spec.get_int_attribute("oiio:dither", 0) : 0; // If user asked for tiles -- which this format doesn't support, emulate // it by buffering the whole image. if (m_spec.tile_width && m_spec.tile_height) m_tilebuffer.resize(m_spec.image_bytes()); return create_and_write_header(); } bool SgiOutput::write_scanline(int y, int z, TypeDesc format, const void* data, stride_t xstride) { y = m_spec.height - y - 1; data = to_native_scanline(format, data, xstride, m_scratch, m_dither, y, z); // In SGI format all channels are saved to file separately: firsty all // channel 1 scanlines are saved, then all channel2 scanlines are saved // and so on. // // Note that since SGI images are pretty archaic and most probably // people won't be too picky about full flexibility writing them, we // content ourselves with only writing uncompressed data, and don't // attempt to write with RLE encoding. int bpc = m_spec.format.size(); // bytes per channel std::vector channeldata(m_spec.width * bpc); for (int c = 0; c < m_spec.nchannels; ++c) { unsigned char* cdata = (unsigned char*)data + c * bpc; for (int x = 0; x < m_spec.width; ++x) { channeldata[x * bpc] = cdata[0]; if (bpc == 2) channeldata[x * bpc + 1] = cdata[1]; cdata += m_spec.nchannels * bpc; // advance to next pixel } if (bpc == 2 && littleendian()) swap_endian((unsigned short*)&channeldata[0], m_spec.width); long scanline_offset = sgi_pvt::SGI_HEADER_LEN + (c * m_spec.height + y) * m_spec.width * bpc; fseek(m_fd, scanline_offset, SEEK_SET); if (!fwrite(&channeldata[0], 1, m_spec.width * bpc)) { return false; } } return true; } bool SgiOutput::write_tile(int x, int y, int z, TypeDesc format, const void* data, stride_t xstride, stride_t ystride, stride_t zstride) { // Emulate tiles by buffering the whole image return copy_tile_to_image_buffer(x, y, z, format, data, xstride, ystride, zstride, &m_tilebuffer[0]); } bool SgiOutput::close() { if (!m_fd) { // already closed init(); return true; } bool ok = true; if (m_spec.tile_width) { // Handle tile emulation -- output the buffered pixels ASSERT(m_tilebuffer.size()); ok &= write_scanlines(m_spec.y, m_spec.y + m_spec.height, 0, m_spec.format, &m_tilebuffer[0]); std::vector().swap(m_tilebuffer); } fclose(m_fd); init(); return ok; } bool SgiOutput::create_and_write_header() { sgi_pvt::SgiHeader sgi_header; sgi_header.magic = sgi_pvt::SGI_MAGIC; sgi_header.storage = sgi_pvt::VERBATIM; sgi_header.bpc = m_spec.format.size(); if (m_spec.height == 1 && m_spec.nchannels == 1) sgi_header.dimension = sgi_pvt::ONE_SCANLINE_ONE_CHANNEL; else if (m_spec.nchannels == 1) sgi_header.dimension = sgi_pvt::MULTI_SCANLINE_ONE_CHANNEL; else sgi_header.dimension = sgi_pvt::MULTI_SCANLINE_MULTI_CHANNEL; sgi_header.xsize = m_spec.width; sgi_header.ysize = m_spec.height; sgi_header.zsize = m_spec.nchannels; sgi_header.pixmin = 0; sgi_header.pixmax = (sgi_header.bpc == 1) ? 255 : 65535; sgi_header.dummy = 0; ParamValue* ip = m_spec.find_attribute("ImageDescription", TypeDesc::STRING); if (ip && ip->data()) { const char** img_descr = (const char**)ip->data(); strncpy(sgi_header.imagename, *img_descr, 80); sgi_header.imagename[79] = 0; } sgi_header.colormap = sgi_pvt::NORMAL; if (littleendian()) { swap_endian(&sgi_header.magic); swap_endian(&sgi_header.dimension); swap_endian(&sgi_header.xsize); swap_endian(&sgi_header.ysize); swap_endian(&sgi_header.zsize); swap_endian(&sgi_header.pixmin); swap_endian(&sgi_header.pixmax); swap_endian(&sgi_header.colormap); } char dummy[404] = { 0 }; if (!fwrite(&sgi_header.magic) || !fwrite(&sgi_header.storage) || !fwrite(&sgi_header.bpc) || !fwrite(&sgi_header.dimension) || !fwrite(&sgi_header.xsize) || !fwrite(&sgi_header.ysize) || !fwrite(&sgi_header.zsize) || !fwrite(&sgi_header.pixmin) || !fwrite(&sgi_header.pixmax) || !fwrite(&sgi_header.dummy) || !fwrite(sgi_header.imagename, 1, 80) || !fwrite(&sgi_header.colormap) || !fwrite(dummy, 404, 1)) { error("Error writing to \"%s\"", m_filename); return false; } return true; } OIIO_PLUGIN_NAMESPACE_END