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Merge bccaa5368a into 423298e071

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yonni12 2017-07-12 17:10:30 +00:00 committed by GitHub
commit 6ae2af394a
1 changed files with 27 additions and 14 deletions

41
stb_image.h
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@ -83,6 +83,7 @@ RECENT REVISION HISTORY:
Optimizations & bugfixes
Fabian "ryg" Giesen
Arseny Kapoulkine
John-Mark Allen
Bug & warning fixes
Marc LeBlanc David Woo Guillaume George Martins Mozeiko
@ -1046,21 +1047,33 @@ static unsigned char *stbi__load_and_postprocess_8bit(stbi__context *s, int *x,
// @TODO: move stbi__convert_format to here
if (stbi__vertically_flip_on_load) {
int w = *x, h = *y;
int channels = req_comp ? req_comp : *comp;
int row,col,z;
stbi_uc *image = (stbi_uc *) result;
int w = *x, h = *y;
int row;
int channels = req_comp ? req_comp : *comp;
size_t row_stride = w * channels * sizeof( stbi_uc );
stbi_uc* image = (stbi_uc *) result;
// @OPTIMIZE: use a bigger temp buffer and memcpy multiple pixels at once
for (row = 0; row < (h>>1); row++) {
for (col = 0; col < w; col++) {
for (z = 0; z < channels; z++) {
stbi_uc temp = image[(row * w + col) * channels + z];
image[(row * w + col) * channels + z] = image[((h - row - 1) * w + col) * channels + z];
image[((h - row - 1) * w + col) * channels + z] = temp;
}
}
}
// Stack temporary row storage for smaller images
stbi_uc temp_row_stack[2048];
stbi_uc* temp_row = temp_row_stack;
// malloc'd temporary row storage if 2048uc isn't large enoughs
stbi_uc* temp_row_heap = NULL;
if( w * channels > 2048 ) {
temp_row_heap = (stbi_uc *) stbi__malloc( row_stride );
temp_row = temp_row_heap;
}
for (row = 0; row < (h>>1); row++) {
memcpy( temp_row, &image[row * w * channels], row_stride );
memcpy( &image[row * w * channels], &image[(h - row - 1) * w * channels], row_stride );
memcpy( &image[(h - row - 1 ) * w * channels], temp_row, row_stride );
}
if( temp_row_heap != NULL ) {
STBI_FREE( temp_row_heap );
temp_row_heap = NULL;
}
}
return (unsigned char *) result;