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Return blocks in reverse order to reduce reallocations

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Alexander 2017-09-17 19:54:49 +03:00
parent fd907fbdc9
commit c8a2923d17
1 changed files with 8 additions and 5 deletions
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13
libImaging/Storage.c
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@ -287,9 +287,9 @@ _get_block(int requested_size, int dirty)
free(_blocks[_blocks_free]);
return NULL;
}
// if (block != _blocks[_blocks_free]) {
// printf("reallocat: %p %p\n", block, _blocks[_blocks_free]);
// }
if (block != _blocks[_blocks_free]) {
// printf("reallocat: %p %p\n", block, _blocks[_blocks_free]);
}
if ( ! dirty) {
memset(block, 0, requested_size);
}
@ -361,7 +361,10 @@ ImagingAllocateArray(Imaging im, int dirty)
}
/* Allocate image as an array of lines */
for (y = 0, line_in_block = 0, current_block = 0; y < im->ysize; y++) {
line_in_block = 0;
/* Return blocks in reverse order to reduce reallocations */
current_block = blocks_count - 1;
for (y = 0; y < im->ysize; y++) {
if (line_in_block == 0) {
int lines_remained = lines_per_block;
if (lines_remained > im->ysize - y) {
@ -380,7 +383,7 @@ ImagingAllocateArray(Imaging im, int dirty)
if (line_in_block >= lines_per_block) {
/* Reset counter and start new block */
line_in_block = 0;
current_block += 1;
current_block -= 1;
}
}