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stb_image: use thread-locals for vertically_flip flag and g_failure_reason

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This commit is contained in:
Sean Barrett 2020-02-02 07:06:05 -08:00
parent 7cce4c3ad9
commit eb48fbdced
1 changed files with 37 additions and 4 deletions
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41
stb_image.h
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@ -466,6 +466,9 @@ STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert);
// flip the image vertically, so the first pixel in the output array is the bottom left // flip the image vertically, so the first pixel in the output array is the bottom left
STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip); STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip);
// as above, but only applies to images loaded on the thread that calls the function
// this function is only available if your compiler supports thread-local variables
STBIDEF void stbi_set_flip_vertically_on_load_thread(int flag_true_if_should_flip);
// ZLIB client - used by PNG, available for other purposes // ZLIB client - used by PNG, available for other purposes
@ -563,6 +566,17 @@ STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const ch
#define stbi_inline __forceinline #define stbi_inline __forceinline
#endif #endif
#ifndef STBI_NO_THREAD_LOCALS
#if __cplusplus >= 201103L
#define STBI_THREAD_LOCAL thread_local
#elif __STDC_VERSION_ >= 201112L
#define STBI_THREAD_LOCAL _Thread_local
#elif defined(__GNUC__)
#define STBI_THREAD_LOCAL __thread
#elif _MSC_VER
#define STBI_THREAD_LOCAL __declspec(thread)
#endif
#endif
#ifdef _MSC_VER #ifdef _MSC_VER
typedef unsigned short stbi__uint16; typedef unsigned short stbi__uint16;
@ -873,8 +887,11 @@ static void *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int
static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp); static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp);
#endif #endif
// this is not threadsafe static
static const char *stbi__g_failure_reason; #ifdef STBI_THREAD_LOCAL
STBI_THREAD_LOCAL
#endif
const char *stbi__g_failure_reason;
STBIDEF const char *stbi_failure_reason(void) STBIDEF const char *stbi_failure_reason(void)
{ {
@ -995,13 +1012,29 @@ static float *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp);
static stbi_uc *stbi__hdr_to_ldr(float *data, int x, int y, int comp); static stbi_uc *stbi__hdr_to_ldr(float *data, int x, int y, int comp);
#endif #endif
static int stbi__vertically_flip_on_load = 0; static int stbi__vertically_flip_on_load_global = 0;
STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip) STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip)
{ {
stbi__vertically_flip_on_load = flag_true_if_should_flip; stbi__vertically_flip_on_load_global = flag_true_if_should_flip;
} }
#ifndef STBI_THREAD_LOCAL
#define stbi__vertically_flip_on_load stbi__vertically_flip_on_load_global
#else
static STBI_THREAD_LOCAL int stbi__vertically_flip_on_load_local, stbi__vertically_flip_on_load_set;
STBIDEF void stbi_set_flip_vertically_on_load_thread(int flag_true_if_should_flip)
{
stbi__vertically_flip_on_load_local = flag_true_if_should_flip;
stbi__vertically_flip_on_load_set = 1;
}
#define stbi__vertically_flip_on_load (stbi__vertically_flip_on_load_set \
? stbi__vertically_flip_on_load_local \
: stbi__vertically_flip_on_load_global)
#endif // STBI_THREAD_LOCAL
static void *stbi__load_main(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri, int bpc) static void *stbi__load_main(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri, int bpc)
{ {
memset(ri, 0, sizeof(*ri)); // make sure it's initialized if we add new fields memset(ri, 0, sizeof(*ri)); // make sure it's initialized if we add new fields