144 lines
6.3 KiB
Lua
144 lines
6.3 KiB
Lua
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local ffi = require( "ffi" )
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local libs = ffi_stb_dll or {
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OSX = { x64 = "stb_dll" },
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Windows = { x64 = "stb_dll.dll" },
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Linux = { x64 = "stb_dll.so", arm = "stb_dll.so" },
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BSD = { x64 = "stb_dll.so" },
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POSIX = { x64 = "stb_dll.so" },
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Other = { x64 = "stb_dll.so" },
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}
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local lib = ffi_stb_dll or libs[ ffi.os ][ ffi.arch ]
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local stb_lib = ffi.load( lib )
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ffi.cdef[[
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/********** stb_lib ****************************************************************/
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typedef unsigned char stbi_uc;
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typedef unsigned short stbi_us;
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//////////////////////////////////////////////////////////////////////////////
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//
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// PRIMARY API - works on images of any type
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//
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//
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// load image by filename, open file, or memory buffer
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//
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typedef struct
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{
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int (*read) (void *user,char *data,int size); // fill 'data' with 'size' bytes. return number of bytes actually read
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void (*skip) (void *user,int n); // skip the next 'n' bytes, or 'unget' the last -n bytes if negative
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int (*eof) (void *user); // returns nonzero if we are at end of file/data
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} stbi_io_callbacks;
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////////////////////////////////////
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//
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// 8-bits-per-channel interface
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//
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stbi_uc *stbi_load_from_memory (stbi_uc const *buffer, int len , int *x, int *y, int *channels_in_file, int desired_channels);
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stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk , void *user, int *x, int *y, int *channels_in_file, int desired_channels);
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stbi_uc *stbi_load (char const *filename, int *x, int *y, int *channels_in_file, int desired_channels);
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stbi_uc *stbi_load_from_file (void *f, int *x, int *y, int *channels_in_file, int desired_channels);
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// for stbi_load_from_file, file pointer is left pointing immediately after image
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stbi_uc *stbi_load_gif_from_memory(stbi_uc const *buffer, int len, int **delays, int *x, int *y, int *z, int *comp, int req_comp);
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////////////////////////////////////
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//
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// 16-bits-per-channel interface
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//
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stbi_us *stbi_load_16_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *channels_in_file, int desired_channels);
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stbi_us *stbi_load_16_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *channels_in_file, int desired_channels);
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stbi_us *stbi_load_16 (char const *filename, int *x, int *y, int *channels_in_file, int desired_channels);
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stbi_us *stbi_load_from_file_16(void *f, int *x, int *y, int *channels_in_file, int desired_channels);
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////////////////////////////////////
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//
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// float-per-channel interface
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//
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float *stbi_loadf_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *channels_in_file, int desired_channels);
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float *stbi_loadf_from_callbacks (stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *channels_in_file, int desired_channels);
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float *stbi_loadf (char const *filename, int *x, int *y, int *channels_in_file, int desired_channels);
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float *stbi_loadf_from_file (void *f, int *x, int *y, int *channels_in_file, int desired_channels);
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void stbi_hdr_to_ldr_gamma(float gamma);
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void stbi_hdr_to_ldr_scale(float scale);
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void stbi_ldr_to_hdr_gamma(float gamma);
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void stbi_ldr_to_hdr_scale(float scale);
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// stbi_is_hdr is always defined, but always returns false if STBI_NO_HDR
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int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user);
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int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len);
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int stbi_is_hdr (char const *filename);
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int stbi_is_hdr_from_file(void *f);
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// get a VERY brief reason for failure
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// on most compilers (and ALL modern mainstream compilers) this is threadsafe
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const char *stbi_failure_reason (void);
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// free the loaded image -- this is just free()
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void stbi_image_free (void *retval_from_stbi_load);
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// get image dimensions & components without fully decoding
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int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp);
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int stbi_info_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp);
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int stbi_is_16_bit_from_memory(stbi_uc const *buffer, int len);
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int stbi_is_16_bit_from_callbacks(stbi_io_callbacks const *clbk, void *user);
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int stbi_info (char const *filename, int *x, int *y, int *comp);
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int stbi_info_from_file (void *f, int *x, int *y, int *comp);
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int stbi_is_16_bit (char const *filename);
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int stbi_is_16_bit_from_file(void *f);
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// for image formats that explicitly notate that they have premultiplied alpha,
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// we just return the colors as stored in the file. set this flag to force
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// unpremultiplication. results are undefined if the unpremultiply overflow.
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void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply);
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// indicate whether we should process iphone images back to canonical format,
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// or just pass them through "as-is"
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void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert);
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// flip the image vertically, so the first pixel in the output array is the bottom left
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void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip);
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// as above, but only applies to images loaded on the thread that calls the function
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// this function is only available if your compiler supports thread-local variables;
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// calling it will fail to link if your compiler doesn't
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void stbi_set_unpremultiply_on_load_thread(int flag_true_if_should_unpremultiply);
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void stbi_convert_iphone_png_to_rgb_thread(int flag_true_if_should_convert);
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void stbi_set_flip_vertically_on_load_thread(int flag_true_if_should_flip);
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// ZLIB client - used by PNG, available for other purposes
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char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen);
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char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header);
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char *stbi_zlib_decode_malloc(const char *buffer, int len, int *outlen);
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int stbi_zlib_decode_buffer(char *obuffer, int olen, const char *ibuffer, int ilen);
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char *stbi_zlib_decode_noheader_malloc(const char *buffer, int len, int *outlen);
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int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen);
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]]
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return stb_lib
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