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/* Copyright (C) 2010 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 and interface for texture codecs.
*/
#ifndef INCLUDED_TEX_CODEC
#define INCLUDED_TEX_CODEC
#include "tex.h"
#include "tex_internal.h" // for codec's convenience
/**
* virtual method table for TexCodecs.
* rationale: this works in C and also allows storing name and next in vtbl.
* 'template method'-style interface to increase code reuse and
* simplify writing new codecs.
**/
class ITexCodec
{
public:
/**
* decode the file into a Tex structure.
*
* @param data input data array (non-const, because the texture
* may have to be flipped in-place - see "texture orientation").
* @param size [bytes] of data, always >= 4
* (this is usually enough to compare the header's "magic" field,
* and no legitimate file will be smaller)
* @param t output texture object
* @return Status
**/
virtual Status decode(u8* data, size_t size, Tex* RESTRICT t) const = 0;
/**
* encode the texture data into the codec's file format (in memory).
*
* @param t input texture object. note: non-const because encoding may
* require a Tex::transform.
* @param da output data array, allocated by codec.
* rationale: some codecs cannot calculate the output size beforehand
* (e.g. PNG output via libpng), so the output memory cannot be allocated
* by the caller.
* @return Status
**/
virtual Status encode(Tex* RESTRICT t, DynArray* RESTRICT da) const = 0;
/**
* transform the texture's pixel format.
*
* @param t texture object
* @param transforms: OR-ed combination of TEX_* flags that are to
* be changed. note: the codec needs only handle situations specific
* to its format; generic pixel format transforms are handled by
* the caller.
**/
virtual Status transform(Tex* t, size_t transforms) const = 0;
/**
* indicate if the data appears to be an instance of this codec's header,
* i.e. can this codec decode it?
*
* @param file input data; only guaranteed to be 4 bytes!
* (this should be enough to examine the header's 'magic' field)
* @return bool
**/
virtual bool is_hdr(const u8* file) const = 0;
/**
* is the extension that of a file format supported by this codec?
*
* rationale: cannot just return the extension string and have
* caller compare it (-> smaller code) because a codec's file format
* may have several valid extensions (e.g. jpg and jpeg).
*
* @param extension (including '.')
* @return bool
**/
virtual bool is_ext(const OsPath& extension) const = 0;
/**
* return size of the file header supported by this codec.
*
* @param file the specific header to return length of (taking its
* variable-length fields into account). if NULL, return minimum
* guaranteed header size, i.e. the header without any
* variable-length fields.
* @return size [bytes]
**/
virtual size_t hdr_size(const u8* file) const = 0;
/**
* name of codec for debug purposes. typically set via TEX_CODEC_REGISTER.
**/
virtual const wchar_t* get_name() const = 0;
virtual ~ITexCodec() {}
};
class TexCodecPng:ITexCodec {
public:
virtual Status decode(u8* data, size_t size, Tex* RESTRICT t) const;
virtual Status encode(Tex* RESTRICT t, DynArray* RESTRICT da) const;
virtual Status transform(Tex* t, size_t transforms) const;
virtual bool is_hdr(const u8* file) const;
virtual bool is_ext(const OsPath& extension) const;
virtual size_t hdr_size(const u8* file) const;
virtual const wchar_t* get_name() const {
static const wchar_t *name = L"png";
return name;
};
};
class TexCodecDds:ITexCodec {
public:
virtual Status decode(u8* data, size_t size, Tex* RESTRICT t) const;
virtual Status encode(Tex* RESTRICT t, DynArray* RESTRICT da) const;
virtual Status transform(Tex* t, size_t transforms) const;
virtual bool is_hdr(const u8* file) const;
virtual bool is_ext(const OsPath& extension) const;
virtual size_t hdr_size(const u8* file) const;
virtual const wchar_t* get_name() const {
static const wchar_t *name = L"dds";
return name;
};
};
class TexCodecTga:ITexCodec {
public:
virtual Status decode(u8* data, size_t size, Tex* RESTRICT t) const;
virtual Status encode(Tex* RESTRICT t, DynArray* RESTRICT da) const;
virtual Status transform(Tex* t, size_t transforms) const;
virtual bool is_hdr(const u8* file) const;
virtual bool is_ext(const OsPath& extension) const;
virtual size_t hdr_size(const u8* file) const;
virtual const wchar_t* get_name() const {
static const wchar_t *name = L"tga";
return name;
};
};
class TexCodecBmp:ITexCodec {
public:
virtual Status decode(u8* data, size_t size, Tex* RESTRICT t) const;
virtual Status encode(Tex* RESTRICT t, DynArray* RESTRICT da) const;
virtual Status transform(Tex* t, size_t transforms) const;
virtual bool is_hdr(const u8* file) const;
virtual bool is_ext(const OsPath& extension) const;
virtual size_t hdr_size(const u8* file) const;
virtual const wchar_t* get_name() const {
static const wchar_t *name = L"bmp";
return name;
};
};
/**
* Find codec that recognizes the desired output file extension.
*
* @param extension
* @param c (out) vtbl of responsible codec
* @return Status; ERR::RES_UNKNOWN_FORMAT (without warning, because this is
* called by tex_is_known_extension) if no codec indicates they can
* handle the given extension.
**/
extern Status tex_codec_for_filename(const OsPath& extension, const ITexCodec** c);
/**
* find codec that recognizes the header's magic field.
*
* @param data typically contents of file, but need only include the
* (first 4 bytes of) header.
* @param data_size [bytes]
* @param c (out) vtbl of responsible codec
* @return Status; ERR::RES_UNKNOWN_FORMAT if no codec indicates they can
* handle the given format (header).
**/
extern Status tex_codec_for_header(const u8* data, size_t data_size, const ITexCodec** c);
/**
* transform the texture's pixel format.
* tries each codec's transform method once, or until one indicates success.
*
* @param t texture object
* @param transforms: OR-ed combination of TEX_* flags that are to
* be changed.
* @return Status
**/
extern Status tex_codec_transform(Tex* t, size_t transforms);
/**
* allocate an array of row pointers that point into the given texture data.
* for texture decoders that support output via row pointers (e.g. PNG),
* this allows flipping the image vertically (useful when matching bottom-up
* textures to a global orientation) directly, which is much more
* efficient than transforming later via copying all pixels.
*
* @param data the texture data into which row pointers will point.
* note: we don't allocate it here because this function is
* needed for encoding, too (where data is already present).
* @param h height [pixels] of texture.
* @param pitch size [bytes] of one texture row, i.e. width*bytes_per_pixel.
* @param src_flags TexFlags of source texture. used to extract its
* orientation.
* @param dst_orientation desired orientation of the output data.
* can be one of TEX_BOTTOM_UP, TEX_TOP_DOWN, or 0 for the
* "global orientation".
* depending on src and dst, the row array is flipped if necessary.
**/
typedef const u8* RowPtr;
extern std::vector<RowPtr> tex_codec_alloc_rows(const u8* data, size_t h, size_t pitch, size_t src_flags, size_t dst_orientation);
/**
* apply transforms and then copy header and image into output buffer.
*
* @param t input texture object
* @param transforms transformations to be applied to pixel format
* @param hdr header data
* @param hdr_size [bytes]
* @param da output data array (will be expanded as necessary)
* @return Status
**/
extern Status tex_codec_write(Tex* t, size_t transforms, const void* hdr, size_t hdr_size, DynArray* da);
#endif // #ifndef INCLUDED_TEX_CODEC
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