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Code Issues Releases Activity

added stbi_vertically_flip_on_load

pull/94/head
Nicolas Guillemot 2015-03-29 03:03:09 -07:00
parent bdef693b7c
commit c500a90375
1 changed files with 44 additions and 12 deletions
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56
stb_image.h
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@ -487,6 +487,8 @@ STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultipl
// or just pass them through "as-is"
STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert);
// flip the image vertically. useful for opengl image loading.
STBIDEF void stbi_vertically_flip_on_load(int flag_true_if_should_flip);
// ZLIB client - used by PNG, available for other purposes
@ -885,44 +887,74 @@ 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);
#endif
static int stbi__vertically_flip_on_load = 0;
STBIDEF void stbi_vertically_flip_on_load(int flag_true_if_should_flip)
{
stbi__vertically_flip_on_load = flag_true_if_should_flip;
}
static unsigned char *stbi_load_main(stbi__context *s, int *x, int *y, int *comp, int req_comp)
{
unsigned char *result = NULL;
if (0); // get the test chain started
#ifndef STBI_NO_JPEG
if (stbi__jpeg_test(s)) return stbi__jpeg_load(s,x,y,comp,req_comp);
else if (stbi__jpeg_test(s)) result = stbi__jpeg_load(s,x,y,comp,req_comp);
#endif
#ifndef STBI_NO_PNG
if (stbi__png_test(s)) return stbi__png_load(s,x,y,comp,req_comp);
else if (stbi__png_test(s)) result = stbi__png_load(s,x,y,comp,req_comp);
#endif
#ifndef STBI_NO_BMP
if (stbi__bmp_test(s)) return stbi__bmp_load(s,x,y,comp,req_comp);
else if (stbi__bmp_test(s)) result = stbi__bmp_load(s,x,y,comp,req_comp);
#endif
#ifndef STBI_NO_GIF
if (stbi__gif_test(s)) return stbi__gif_load(s,x,y,comp,req_comp);
else if (stbi__gif_test(s)) result = stbi__gif_load(s,x,y,comp,req_comp);
#endif
#ifndef STBI_NO_PSD
if (stbi__psd_test(s)) return stbi__psd_load(s,x,y,comp,req_comp);
else if (stbi__psd_test(s)) result = stbi__psd_load(s,x,y,comp,req_comp);
#endif
#ifndef STBI_NO_PIC
if (stbi__pic_test(s)) return stbi__pic_load(s,x,y,comp,req_comp);
else if (stbi__pic_test(s)) result = stbi__pic_load(s,x,y,comp,req_comp);
#endif
#ifndef STBI_NO_PNM
if (stbi__pnm_test(s)) return stbi__pnm_load(s,x,y,comp,req_comp);
else if (stbi__pnm_test(s)) result = stbi__pnm_load(s,x,y,comp,req_comp);
#endif
#ifndef STBI_NO_HDR
if (stbi__hdr_test(s)) {
else if (stbi__hdr_test(s)) {
float *hdr = stbi__hdr_load(s, x,y,comp,req_comp);
return stbi__hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp);
result = stbi__hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp);
}
#endif
#ifndef STBI_NO_TGA
// test tga last because it's a crappy test!
if (stbi__tga_test(s))
return stbi__tga_load(s,x,y,comp,req_comp);
else if (stbi__tga_test(s))
result = stbi__tga_load(s,x,y,comp,req_comp);
#endif
return stbi__errpuc("unknown image type", "Image not of any known type, or corrupt");
else
return stbi__errpuc("unknown image type", "Image not of any known type, or corrupt");
// post-processing
if (stbi__vertically_flip_on_load) {
int depth = req_comp ? req_comp : *comp;
int row,col,z;
stbi_uc temp;
for (row = 0; row < *y / 2; row++) {
for (col = 0; col < *x; col++) {
for (z = 0; z < depth; z++) {
temp = result[(row * (*x) + col) * depth + z];
result[(row * (*x) + col) * depth + z] = result[((*y - row - 1) * (*x) + col) * depth + z];
result[((*y - row - 1) * (*x) + col) * depth + z] = temp;
}
}
}
}
return result;
}
#ifndef STBI_NO_STDIO