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/* Copyright (C) 2014 Wildfire Games.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* support routines for texture codecs
*/
#include "precompiled.h"
#include "tex_codec.h"
#include <string.h>
#include <stdlib.h>
#include "lib/allocators/shared_ptr.h" // ArrayDeleter
#include "tex.h"
// Statically allocate all of the codecs...
TexCodecDds DdsCodec;
TexCodecPng PngCodec;
TexCodecTga TgaCodec;
TexCodecBmp BmpCodec;
// Codecs will be searched in this order
static const ITexCodec *codecs[] = {(ITexCodec *)&DdsCodec, (ITexCodec *)&PngCodec,
(ITexCodec *)&TgaCodec, (ITexCodec *)&BmpCodec};
static const int codecs_len = sizeof(codecs) / sizeof(ITexCodec*);
// find codec that recognizes the desired output file extension,
// or return ERR::TEX_UNKNOWN_FORMAT if unknown.
// note: does not raise a warning because it is used by
// tex_is_known_extension.
Status tex_codec_for_filename(const OsPath& extension, const ITexCodec** c)
{
for(int i = 0; i < codecs_len; ++i)
{
// we found it
if(codecs[i]->is_ext(extension)) {
*c = codecs[i];
return INFO::OK;
}
}
return ERR::TEX_UNKNOWN_FORMAT; // NOWARN
}
// find codec that recognizes the header's magic field
Status tex_codec_for_header(const u8* file, size_t file_size, const ITexCodec** c)
{
// we guarantee at least 4 bytes for is_hdr to look at
if(file_size < 4)
WARN_RETURN(ERR::TEX_INCOMPLETE_HEADER);
for(int i = 0; i < codecs_len; ++i)
{
// we found it
if(codecs[i]->is_hdr(file)) {
*c = codecs[i];
return INFO::OK;
}
}
WARN_RETURN(ERR::TEX_UNKNOWN_FORMAT);
}
Status tex_codec_transform(Tex* t, size_t transforms)
{
Status ret = INFO::TEX_CODEC_CANNOT_HANDLE;
// find codec that understands the data, and transform
for(int i = 0; i < codecs_len; ++i)
{
Status err = codecs[i]->transform(t, transforms);
// success
if(err == INFO::OK)
return INFO::OK;
// something went wrong
else if(err != INFO::TEX_CODEC_CANNOT_HANDLE)
{
ret = err;
DEBUG_WARN_ERR(ERR::LOGIC); // codec indicates error
}
}
return ret;
}
//-----------------------------------------------------------------------------
// helper functions used by codecs
//-----------------------------------------------------------------------------
// allocate an array of row pointers that point into the given texture data.
// <file_orientation> indicates whether the file format is top-down or
// bottom-up; the row array is inverted if necessary to match global
// orienatation. (this is more efficient than "transforming" later)
//
// used by PNG and JPG codecs.
//
// note: we don't allocate the data param ourselves because this function is
// needed for encoding, too (where data is already present).
std::vector<RowPtr> tex_codec_alloc_rows(const u8* data, size_t h, size_t pitch, size_t src_flags, size_t dst_orientation)
{
const bool flip = !tex_orientations_match(src_flags, dst_orientation);
std::vector<RowPtr> rows(h);
// determine start position and direction
RowPtr pos = flip? data+pitch*(h-1) : data;
const ssize_t add = flip? -(ssize_t)pitch : (ssize_t)pitch;
const RowPtr end = flip? data-pitch : data+pitch*h;
for(size_t i = 0; i < h; i++)
{
rows[i] = pos;
pos += add;
}
ENSURE(pos == end);
return rows;
}
Status tex_codec_write(Tex* t, size_t transforms, const void* hdr, size_t hdr_size, DynArray* da)
{
RETURN_STATUS_IF_ERR(t->transform(transforms));
void* img_data = t->get_data(); const size_t img_size = t->img_size();
RETURN_STATUS_IF_ERR(da_append(da, hdr, hdr_size));
RETURN_STATUS_IF_ERR(da_append(da, img_data, img_size));
return INFO::OK;
}
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