janwas
494d27bdd4
dyn_array supports "wrapping" other types of memory (stopgap measure)
texture codecs now load via DynArray (intermediate step to all mem stuff
going through res/mem.cpp)
simplified tex codecs by doing as many checks as possible in
tex_load_mem ("template method"-esque)
This was SVN commit r2690.
78 lines
2.6 KiB
C
78 lines
2.6 KiB
C
#ifndef TEX_CODEC_H__
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#define TEX_CODEC_H__
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#include "tex.h"
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#include "dyn_array.h"
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// rationale: no C++ to allow us to store const char* name in vtbl.
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struct TexCodecVTbl
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{
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// 'template method' to increase code reuse and simplify writing new codecs
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// pointers aren't const, because the textures
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// may have to be flipped in-place - see "texture orientation".
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// size is guaranteed to be >= 4.
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// (usually enough to compare the header's "magic" field;
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// anyway, no legitimate file will be smaller)
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int (*decode)(DynArray* da, Tex* t, const char** perr_msg);
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// rationale: some codecs cannot calculate the output size beforehand
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// (e.g. PNG output via libpng); we therefore require each one to
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// allocate memory itself and return the pointer.
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int (*encode)(const char* ext, Tex* t, DynArray* da, const char** perr_msg);
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int (*transform)(Tex* t, uint transforms);
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// only guaranteed 4 bytes!
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bool (*is_hdr)(const u8* file);
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size_t (*hdr_size)(const u8* file);
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const char* name;
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};
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#define TEX_CODEC_REGISTER(name)\
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static const TexCodecVTbl vtbl = { name##_decode, name##_encode, name##_transform, name##_is_hdr, name##_hdr_size, #name};\
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static int dummy = tex_codec_register(&vtbl);
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// the given texture cannot be handled by this codec; pass the buck on to the next one
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const int TEX_CODEC_CANNOT_HANDLE = 1;
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// add this vtbl to the codec list. called at NLSO init time by the
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// TEX_CODEC_REGISTER in each codec file. note that call order and therefore
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// order in the list is undefined, but since each codec only steps up if it
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// can handle the given format, this is not a problem.
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extern int tex_codec_register(const TexCodecVTbl* c);
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// allocate an array of row pointers that point into the given texture data.
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// <file_orientation> indicates whether the file format is top-down or
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// bottom-up; the row array is inverted if necessary to match global
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// orienatation. (this is more efficient than "transforming" later)
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//
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// used by PNG and JPG codecs; caller must free() rows when done.
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//
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// note: we don't allocate the data param ourselves because this function is
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// needed for encoding, too (where data is already present).
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typedef const u8* RowPtr;
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typedef RowPtr* RowArray;
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extern int tex_codec_alloc_rows(const u8* data, size_t h, size_t pitch,
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uint src_flags, uint dst_orientation, RowArray& rows);
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extern int tex_codec_set_orientation(Tex* t, uint file_orientation);
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extern int tex_codec_write(Tex* t, uint transforms, const void* hdr, size_t hdr_size, DynArray* da);
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struct MemSource
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{
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u8* p;
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size_t size;
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size_t pos;
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};
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#endif // #ifndef TEX_CODEC_H__
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