janwas
a1cddc4ac3
dyn_array.h -> allocators.h ogl_tex: reenable performance warning tex: comments h_mgr: debug_printf if long filename is passed in (so we notice) wsdl: squelch DestroyWindow warning. will look into the cause. sysdep: slightly simplify "restrict" determination This was SVN commit r2916.
84 lines
3.0 KiB
C
84 lines
3.0 KiB
C
#ifndef TEX_CODEC_H__
|
|
#define TEX_CODEC_H__
|
|
|
|
#include "tex.h"
|
|
#include "lib/allocators.h"
|
|
|
|
// rationale: no C++ to allow us to store const char* name in vtbl.
|
|
|
|
struct TexCodecVTbl
|
|
{
|
|
// 'template method' to increase code reuse and simplify writing new codecs
|
|
|
|
// pointers aren't const, because the textures
|
|
// may have to be flipped in-place - see "texture orientation".
|
|
// size is guaranteed to be >= 4.
|
|
// (usually enough to compare the header's "magic" field;
|
|
// anyway, no legitimate file will be smaller)
|
|
int (*decode)(DynArray* restrict da, Tex* restrict t);
|
|
|
|
// rationale: some codecs cannot calculate the output size beforehand
|
|
// (e.g. PNG output via libpng); we therefore require each one to
|
|
// allocate memory itself and return the pointer.
|
|
//
|
|
// note: <t> cannot be made const because encoding may require a
|
|
// tex_transform.
|
|
int (*encode)(Tex* restrict t, DynArray* restrict da);
|
|
|
|
int (*transform)(Tex* t, uint transforms);
|
|
|
|
// only guaranteed 4 bytes!
|
|
bool (*is_hdr)(const u8* file);
|
|
|
|
// precondition: ext is valid string
|
|
// ext doesn't include '.'; just compare against e.g. "png"
|
|
bool (*is_ext)(const char* ext);
|
|
|
|
size_t (*hdr_size)(const u8* file);
|
|
|
|
const char* name;
|
|
};
|
|
|
|
|
|
#define TEX_CODEC_REGISTER(name)\
|
|
static const TexCodecVTbl vtbl = { name##_decode, name##_encode, name##_transform, name##_is_hdr, name##_is_ext, name##_hdr_size, #name};\
|
|
static int dummy = tex_codec_register(&vtbl);
|
|
|
|
|
|
// the given texture cannot be handled by this codec; pass the buck on to the next one
|
|
const int TEX_CODEC_CANNOT_HANDLE = 1;
|
|
|
|
|
|
// add this vtbl to the codec list. called at NLSO init time by the
|
|
// TEX_CODEC_REGISTER in each codec file. note that call order and therefore
|
|
// order in the list is undefined, but since each codec only steps up if it
|
|
// can handle the given format, this is not a problem.
|
|
extern int tex_codec_register(const TexCodecVTbl* c);
|
|
|
|
|
|
// find codec that recognizes the desired output file extension
|
|
extern int tex_codec_for_filename(const char* fn, const TexCodecVTbl** c);
|
|
|
|
// find codec that recognizes the header's magic field
|
|
extern int tex_codec_for_header(const u8* file, size_t file_size, const TexCodecVTbl** c);
|
|
|
|
|
|
|
|
// 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; caller must free() rows when done.
|
|
//
|
|
// note: we don't allocate the data param ourselves because this function is
|
|
// needed for encoding, too (where data is already present).
|
|
typedef const u8* RowPtr;
|
|
typedef RowPtr* RowArray;
|
|
extern int tex_util_alloc_rows(const u8* data, size_t h, size_t pitch,
|
|
uint src_flags, uint dst_orientation, RowArray& rows);
|
|
|
|
extern int tex_util_write(Tex* t, uint transforms, const void* hdr, size_t hdr_size, DynArray* da);
|
|
|
|
#endif // #ifndef TEX_CODEC_H__
|